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Consumption and export investment is the driving force for the development of China's casting industry---BL Die Casting Investment, consumption, and export are the three troikas that drive economic growth. The above three major forces are also extremely important for the development of the casting industry. Consumption is internal demand, that is, the consumption capacity of domestic castings; export is external demand, that is, the demand of China's castings in the international market; investment mainly refers to capital expenditure. For a long time, China's casting industry relies on the development of the above three major powers, but there is an imbalance in the proportion of various powers. At present, in the process of development of China's casting industry, there are drawbacks of excessive dependence on investment and export power. The huge scale of China's casting industry comes from, which is mainly dependent on investment expansion, so that China's casting production scale has rapidly climbed to the top in the world in just a few decades. In addition, the product consumption channels of a large number of casting production enterprises in China are mainly exported. This aspect is determined by the huge production capacity of castings in China and the lack of consumption space in the domestic market. On the other hand, the casting production enterprises in China have long neglected the development of the domestic market. . China's casting industry relies too much on investment and exports to drive industry growth. Once the economic cold is encountered, domestic casting enterprises will be affected by a large area, leading to the lack of success of the company and even the collapse of the economic cold wave. Therefore, China's casting industry should overcome excessive dependence on investment and exports, and balance the use of investment, consumption, and export power.

First, see if the specification is suitable. Most agricultural machinery parts have the specified model and technical parameters. If you purchase electrical equipment, you should pay attention to check whether the voltage and power of the replaced parts are the same; when you choose the drive belt, you should pay attention to the model and the perimeter; when choosing the bearings, you should pay attention to the bearing category, etc., so as not to buy the wrong equipment. Caused undue losses. Second, see if the logo is complete. Authentic products have good outer packaging quality, clear writing on the packaging box, vivid overprinting color, and on the packing box and box, they should be marked with the product name, model number, quantity, registered trademark, factory name and telephone number, etc. Put your own mark on the accessories. When large or important parts are shipped from the factory, there are also instructions for use to guide the user to use and maintain it properly. When buying, you should recognize it to prevent buying fake and shoddy products. Third, see whether the geometric deformation. Some parts are prone to deformation due to improper manufacturing, transportation, and storage. When buying, pay attention to checking whether the geometric size and shape are qualified. Fourth, see if the joint is flat. During the handling and storage of spare parts, due to vibrations and bumps, burrs, indentations, breakages, or cracks often occur, affecting the use of parts, and attention should be paid when selecting and purchasing. Fifth, to see whether the surface of parts rust. Qualified parts surface, both a certain degree of precision and bright finish, the more important parts, the higher the degree of the table, the rust on the package, the more strict anti-corrosion. Should pay attention to check the purchase, if found parts of rust spots, mold spots or rubber pieces cracking, loss of elasticity, or the surface of the journal has a clear turning pattern, should be exchanged. 6. See if the protective surface is intact. Most parts are coated with a protective layer at the factory, such as piston and nitrate, and the bearing is protected by paraffin: the piston ring and cylinder liner are coated with rust-proof oil and wrapped with wrapping paper. If the sealing sleeve is found damaged and the wrapping paper is missing when it is purchased, Anti-rust oil or paraffin loss should be returned. Seven, see if there are loose parts glued. The fittings made of two or more parts are assembled by pressing, gluing or welding. No loosening phenomenon is allowed between them. For example, the plunger of the oil pump and the adjusting arm are assembled by pressing; The clutch driven jaw and the steel plate are riveted together. The friction plate and the steel plate are riveted or glued together. If there is looseness during the purchase, they should be exchanged. Eight, see if the rotating parts are flexible. When selecting the oil pump and hydraulic pump assembly, turn the pump shaft by hand and feel flexible and without any stagnation; when selecting the fuel injection pump assembly, the plunger should be able to rotate freely in the plunger sleeve when toggling the adjustment arm. When pushing the roller, the plunger should be able to automatically return to position under the action of the spring. Ninth, see if there are missing parts in the assembly parts. When selecting the injector assembly, check whether there is any leakage of the small parts such as the sealed copper mat of the oil return joint and the small steel ball in the tappet; when selecting the fuel injection pump assembly, you should check the plunger sleeve locating screw seal Whether the small parts such as wheel positioning pins are missing. Ten, see whether the assembly mark is clear. In order to protect the device relationship of the mating parts in accordance with the technical requirements, an assembly mark is engraved on the surface of some parts. Unmarked or indistinguishable markings will cause great difficulty in assembly, often resulting in incorrect installation. Eleven, to see whether the surface wear and tear. If the parts have wear marks on the mating surface, or if paint parts find the old paint after prying off the surface paint, they are often disguised as worn-out parts and can be returned. Twelve, to see if the surface hardness is up to standard. The surface hardness of the fittings has requirements. After the purchase is determined and agreed with the merchant, the hacksaw blade can be used to test. The hardness of the scratch is high when scratched; the hardness is slightly higher after scratching. ; There is a clear trace of the hardness of the bottom.

In recent years, with the rapid development of the manufacturing industry, the precision of processing and manufacturing parts and products has been continuously improved, especially in the processing of important holes on some large parts, which have high requirements for shape, position, dimensional accuracy and surface roughness. Under the conditions of mass production, it is necessary to take certain measures on the tool and processing technology to meet the design requirements of the pattern. First, the issue of the problem When processing the fan motor seat, the processing of the two positioning pin holes on the machine base is always unqualified. The equipment used by the company is the CNC TK6920 milling and boring machine produced by Qier Machine Tool Plant. The machine tool has no cutting fluid supply system. Most of the tools are domestically produced common cutting tools, such as twist drills, ordinary reamers, and some use Sandvik Coromant tools. When machining the pin hole, the process we use is: drilling the center hole → drilling → reaming → reaming. The drilling and expansion process uses a common twist drill, and the hinge uses a domestically used reamer. These tools are connected to the holder by a drill sleeve (reducing sleeve). After the first sample trial processing is completed, the laser measuring instrument measures the pin hole unqualified, mainly has the following problems: 1 The pin hole center distance is out of tolerance. 2 pin hole cylindricity is super poor, forming a trumpet shape. 3 pin hole surface roughness is out of tolerance. 4 pin hole roundness is out of tolerance, an ellipse appears. Second, the cause analysis Through the analysis of the processing technology and production process, we believe that there are mainly the following reasons: (1) Machine tool control accuracy factors The accuracy error of each axis of the machine tool is too large, resulting in the deviation of the pin hole center distance. (2) Tool factor Drilling and reaming with an ordinary drill bit makes the drill bit easily biased, resulting in deflection of the bottom hole. When reaming, the reamer cannot correct the deviation of the bottom hole, and the hole shape error cannot be guaranteed. (3) Tool and tool holder factors The tool is connected to the tool holder through the reducer sleeve. The precision of the tool is not high and the rigidity is poor, which causes the hole diameter and roundness of the pin hole to be out of tolerance. (4) Cutting fluid factor The machine does not have a cooling system. Since the pin hole is a blind hole, the chip and the cutting heat cannot be punched out (band) in time, resulting in an excessive surface roughness of the pin hole. Third, the solution process In order to solve the above problems, we have processed and produced qualified pin holes, and we have further studied and improved the above various factors. 1. Solve problems with machine tools We use a laser measuring instrument to measure the accuracy of each axis of the machine to determine the deviation of the column accuracy (ie, the center of the pin hole). Through testing, it is found that the failure of the installation of the Y-axis scale of the machine tool is the main reason for the accuracy deviation of the error column. Finally, the grating ruler is cleaned and reinstalled, and the precision of each axis of the machine tool is detected by a laser interferometer to make it qualified. Since the machine itself is not equipped with a cutting fluid system, we have designed a separate cutting fluid system to meet the requirements of advanced tools for machine tools. 2. Improve the current tool After adjusting the accuracy of the machine, we explore and troubleshoot the factors of the tool: (1) Determining the direction of the clamping tool During the trial processing, the same material, the same drill bit, and the same feed amount were found, but the results were different each time. This is because the direction of the clamping tool is different each time. Such factors as the angle of the tool will change, causing deviations. (2) Correcting the tool error When using the new reamer for trial processing, it is found that the reamer has a large runout in the circumferential direction. Therefore, we use the dial indicator to check the runout error before use, and the blade with a larger runout error is used. Grinding, making its radial circular runout within a controllable range. (3) Changing the tool feed parameter Reset the feed amount of the reaming drill and the reamer, and select the feed amount when the machining accuracy is the best. (4) Selecting the reducer sleeve and the reamer are connected by the reducer sleeve and the shank, so that there will be errors in each setup, and the reducer sleeve and the shank taper shank and the drill reamer Coordination is not a complete perfection in theory. By observing on the tool setting tool, the drill bit (reasing knife) will go off after each clamping, and basically 90% of the reducer sleeves are unqualified. We chose the trial sleeve with a small error on the tool.

As a kind of mold strengthening technology, the coating technology is mainly applied to the surface treatment of molds with relatively simple working conditions such as plastic molds, glass molds, rubber molds and stamping molds. Die-casting molds need to withstand the harsh environment where the thermal and thermal stresses alternate, so coating technology is generally not used to strengthen the surface of the die-casting mold. Die casting molds are a large class in the mold. With the rapid development of China's automobile and motorcycle industry, the die-casting industry has ushered in a new era of development. At the same time, it also puts forward higher requirements on the mechanical function and life of the integrated casting die. It is still difficult to meet the needs of the continuous use of new mold materials. It is necessary to apply various surface treatment techniques to the surface treatment of die-casting molds in order to achieve high efficiency, high precision and longevity of die-casting molds. . Among various molds, the working conditions of the die-casting mold are relatively harsh. Pressure forging is to make the molten metal fill the mold cavity under high pressure and high speed and die-casting. It is repeatedly contacted with hot metal during the working process. Therefore, the die-casting mold is required to have high heat-resistance, thermal conductivity, wear resistance and corrosion resistance. Properties, impact toughness, red hardness, good release properties, etc. Therefore, the surface treatment technology of die-casting molds is relatively high. In recent years, various new techniques for surface treatment of die-casting molds have emerged, but in general they can be divided into the following three categories: (1) Improvement techniques of traditional heat treatment processes; (2) Surface modification technology, including surface thermal diffusion treatment, surface phase transformation strengthening, electric spark strengthening technology, etc.; (3) coating technology, including electroless plating. Improvements in traditional heat treatment processes Traditional heat treatment processes for die casting molds are quenching-tempering, and surface treatment techniques have been developed in the future. Because the materials available as die-casting molds are varied, the same surface treatment techniques and process applications can have different effects on different materials. Schkov recently proposed a substrate pretreatment technology for mold substrate and surface treatment technology. Based on the traditional process, a suitable processing technology is proposed for different mold materials to improve the mold function and improve the mold life. Another development direction of heat treatment technology improvement is to combine the traditional heat treatment process with the improvement of the surface treatment process of the predecessors to improve the service life of the die-casting mold. For example, carbonitriding by chemical heat treatment, combined with conventional quenching and tempering processes, NQN (ie, carbonitriding-quenching-carbonitriding) composite strengthening, not only obtains high surface hardness, but also effectively hardens. The depth of the layer is increased, the hardness gradient of the layer is fair, the tempering is not disordered, and the corrosion resistance is improved, so that the die-casting mold achieves good core function while the surface quality and function are greatly improved. Surface technology surface thermal diffusion technology This type includes carburizing, nitriding, boronizing, carbonitriding, and sulfur-carbonitriding. Carburizing and carbonitriding The carburizing process is applied to cold, hot work and plastic mold surface strengthening to improve mold life. For example, 3Cr2W8V steel die-casting mold, first carburized, then quenched by 1140 ~ 1150 °C, tempered twice at 550 °C, the surface hardness can reach HRC56 ~ 61, so that the life of die-casting non-ferrous metals and their alloys is 1.8 to 3.0 times. . When carburizing is carried out, the main processes are solid powder carburizing, gas carburizing, vacuum carburizing, ion carburizing, and carbonitriding formed by adding nitrogen in a carburizing atmosphere. Among them, vacuum carburizing and ion carburizing are technologies developed in the past 20 years. The technology has the characteristics of fast percolation speed, average layer thickness, gentle carbon concentration gradient and small deformation of the workpiece, which will be on the mold surface, especially the precision mold. The role of surface treatment is playing an increasingly important role. Nitriding and related low temperature thermal expansion technology This type includes nitriding, ion nitriding, carbonitriding, oxygen-nitrogen osmosis, sulfur-nitrogen osmosis, and sulfur-carbon nitrogen, oxygen-nitrogen ternary osmosis. These methods are simple in process, strong in adaptability, low infiltration temperature (generally 480-600 ° C), small deformation of the workpiece, especially suitable for surface strengthening of precision molds, and high hardness and wear resistance of the nitride layer. Good anti-sticking function. 3Cr2W8V steel die-casting mold, after quenching and tempering, nitriding at 520 ~ 540 °C, the service life is 2 to 3 times better than the non-nitriding mold. In the United States, the die-casting mold made of H13 steel has to be nitrided, and the tempering is replaced by nitriding. The surface hardness is as high as HRC65-70, and the hardness of the core of the mold is low and the toughness is good, thus obtaining excellent comprehensive Coordinated mechanical function. The nitriding process is a commonly used process for the surface treatment of die-casting molds. However, when the nitrided layer has a thin and brittle white bright layer, it cannot withstand the effect of alternating thermal stress, and it is easy to generate micro-cracks and reduce the heat fatigue resistance. Therefore, in the nitriding process, the process must be strictly controlled to avoid the generation of a brittle layer. Recently, foreign countries have proposed the use of secondary and multiple nitriding processes. The repeated nitriding method can decompose the nitride white bright layer which easily generates microcracks during the service process, increase the thickness of the nitriding layer, and at the same time, the surface of the mold has a thick residual stress layer, so that the life of the mold can be significantly improved. In addition, there are methods such as salt bath carbonitriding and salt bath sulfur-nitrogen carbonitriding. These processes are widely used abroad and are rare in the sea. For example, the TFI+ABI process is immersed in a basic oxidizing salt bath after nitrocarburizing in a salt bath. The surface of the workpiece is oxidized and has a black color, and its wear resistance, corrosion resistance and heat resistance are all improved. The life of the aluminum alloy die-casting mold treated by this method is improved by several hundred hours. Another example is the oxynit process for nitriding after sulphur-nitrogen carbon co-infiltration developed in France. It is more suitable for non-ferrous metal die-casting molds. Boronizing Because of the high hardness of the boronized layer (FeB: HV1800 ~ 2300, Fe2B: HV1300 ~ 1500), wear resistance and red hardness, as well as certain corrosion resistance and anti-adhesion, boronizing technology is better in the mold industry. Apply the effect. However, because the working conditions of die-casting molds are very demanding, the boronizing process is less used in the surface treatment of die-casting molds. However, in recent years, an improved boronizing method has been developed to solve the above problems, and it has been applied to the surface treatment of die-casting molds. Such as multi-component, powder coating and so on. The method of boronizing the coating powder is to mix the boron compound and other infiltrating agent and apply it on the surface of the die-casting mold. After the liquid is volatilized, it is sealed and sealed according to the general powder boronizing method, and heated at 920 ° C for 8 hours. Air cold. This method can obtain a dense and average infiltration layer, and the hardness, wear resistance and bending strength of the surface of the mold are improved, and the service life of the mold is uniformly improved by more than 2 times. Rare earth surface strengthening In recent years, the method of adding rare earth elements in the surface strengthening of molds has been widely praised. This is because rare earth elements have many functions such as improving the rate of permeation, strengthening the surface and purifying the surface. It has a great influence on improving the surface structure of the mold, surface physical, chemical and mechanical functions, and can improve the seepage speed and strengthening. Surface, natural rare earth compound. At the same time, the harmful effects of trace impurities distributed on the grain boundary can be eliminated, and the effect of strengthening and not arranging the grain boundary of the mold cavity surface is played. In addition, rare earth elements interact with harmful elements in steel, and natural high melting point compounds can be segregated at the grain boundaries according to these harmful elements, thereby reducing the brittleness of the deep layers. The addition of rare earth element components in the surface strengthening treatment process of the die-casting mold can significantly improve the thickness of the infiltration layer and the surface hardness of various infiltration methods, and at the same time, the microstructure of the infiltrated layer is finely dispersed and the hardness gradient is lowered, thereby making the mold wear resistance and resistance. The cold and hot exhaustion functions have been significantly improved, thus greatly improving the life of the mold. At present, the treatment methods applied to the cavity surface of the die-casting mold include: rare earth carbon co-infiltration, rare earth carbonitriding, rare earth boron co-infiltration, rare earth boron-aluminum co-infiltration, rare earth soft nitriding, rare earth sulfur-nitrogen carbonitriding. Laser surface treatment Laser surface treatment is a thin layer that is heated by a laser beam to rapidly melt the surface of the workpiece to a certain depth, and is coated on the surface of the workpiece by vacuum alloying, electroplating, ion implantation, etc., and is irradiated with the base metal under laser irradiation. Fully fused, after condensation, an alloy layer with a special function of 10 to 1000 μm in thickness is obtained on the surface of the mold, and the cooling rate is equivalent to chill quenching. For example, the surface of H13 steel is treated by laser rapid melting process. The melting zone has high hardness and good heat non-disruption, and has high resistance to plastic deformation. It has a significant pressing effect on the initiation and expansion of fatigue cracks. Recently, Saha and Dahot used the method of laser cladding VC layer on the length of H13 substrate. The research shows that the surface of the obtained mold is solid, dense and non-porous VC steel composite coating, which is not only very strong. The oxidation resistance at 600 ° C, and has a strong ability to resist the reduction of molten metal.EDM cermet process In the continuous development of surface modification technology, an EDM process has emerged. Under the action of electric field, the process generates instantaneous high temperature and high pressure zones on the surface of the base metal, and simultaneously penetrates the ionic cermet material to form the metallurgical bond of the surface, and the surface of the base metal also undergoes instantaneous phase transformation to form martensite and fine. Austenitic organization. This process differs from soldering, as well as sputtering or elemental infiltration, and should be a process in between. It makes good use of the high wear resistance, high temperature resistance and erosion resistance of the cermet material, and the process is simple and the cost is relatively low. It is a new way of surface treatment of die-casting molds. Coating Technology Coating technology is a kind of mold strengthening technology, which is mainly applied to the surface of molds with relatively simple working conditions such as plastic molds, glass molds, rubber molds and stamping molds. Die-casting molds need to withstand the harsh environment where the thermal and thermal stresses alternate, so coating technology is generally not used to strengthen the surface of the die-casting mold. However, in recent years, it has been reported that the surface of the die-casting mold is strengthened by a chemical composite plating method to improve the anti-adhesion and mold release property of the mold surface. The method infiltrates the polytetrafluoroethylene particles on an aluminum-based die-casting mold and then performs (NiP)-polytetrafluoroethylene composite plating. Experiments show that this method is feasible both in terms of process and function, which greatly reduces the friction coefficient of the mold surface. Conclusion Mold pressure processing is an important component of mechanical manufacturing, and the level, quality and longevity of the mold are related to mold surface strengthening technology. With the improvement of science and technology, various mold surface treatment technologies have made great progress in recent years. It is manifested in: 1 improvement of traditional heat treatment process and its combination with other new processes; 2 surface modification technology, including carburizing, low temperature thermal diffusion (various nitriding, carbonitriding, ion nitriding, ternary Co-infiltration, etc., salt bath thermal diffusion, boronizing, rare earth surface strengthening, laser surface treatment and EDM cermet; 3 coating technology. However, for the die-casting molds with extremely strict working conditions, the existing new surface treatment process can not meet the ever-increasing requirements, and it is expected to further improve the technology of the predecessors, and it is also expected to be applied to the surface treatment of the die-casting molds. In view of the fact that surface treatment is one of the important means to improve the life of die-casting molds, it is necessary to improve the overall level of production of die-casting molds in China, and surface treatment technology will play a pivotal role.

Aluminum, a silver-white light metal, ranks 13th in the periodic table and has good ductility. The content of aluminum in the earth's crust is second only to oxygen and silicon, ranking third, and is a rich metal element in the earth's crust. It is an important metal material in industrial production. Because of its low melting point and good ductility, it is a metal material that is frequently used in the die casting industry. Aluminum is a very important metal manufacturing because of its versatility and the variety of applications of both treated metals and their alloys in different industries. High-pressure die-casting faster route makes the molten metal the finished component. This can be removed by injecting the molten metal into a hard steel mold, tool, and allowing it to cool and solidify pressure before it is removed. This process provides an accurate, rapid, low-cost production method for aluminum and zinc die castings, meeting the needs of the high-tech industry where the appearance and dimensional tolerances of the product are critical and the volume is not always large. Aluminum is a high-pressure die-cast aluminum metal used in the process and is a metal alloy that has many advantages and is suitable for casting applications. Many of these reasons are due to the nature of the metal used in aluminum die casting processes. Aluminum has many characteristics that are very suitable for this process. Aluminum is very light and highly tough and can easily be defeated into different shapes and sizes depending on demand. It is also very malleable and has good dimensional stability allowing it to realize complex shapes and thin-walled parts. Aluminium is dust and corrosion resistant, has good electronic properties and excellent thermal properties because it is a good conductor of heat that retains heat and well-shaped actors. It is a competitive pressure die casting process that requires a lot of ingredients, or tight tolerances and surface plating are better quality requirements to achieve gravity die casting. Also the need for machining is very low due to casting tolerances. Heat treatment of pressure die casting is not possible, but due to the high rate of solidification the mechanical properties are very good, however, the processing costs are much higher than they are for gravity die casting. Other mold parts include slides and cores. The core components usually produce openings or positions, but they can all be used to create other details. There are three types of cores, loose, moving, and fixed. The loose core is used to create complex details and insert into dead hands. With a fixed kernel, it is pulled in parallel, and it is attached to death for a long time. Move the kernel in any other way than in parallel. Cleared out of the mold cavity solidified shot.

Technical Analysis of Heat Treatment Process of Die Casting Die Die casting molds are a large class in the mold. With the rapid development of China's automobile and motorcycle industry, the die-casting industry has ushered in a new era of development. At the same time, it also puts forward higher requirements on the comprehensive mechanical properties and life of the die-casting mold. To meet the ever-increasing performance requirements, it is still difficult to meet the application of new mold materials. Various surface treatment techniques must be applied to the surface treatment of die-casting molds to achieve high efficiency, high precision and long life of die-casting molds. . In various molds, the working conditions of the die-casting mold are more demanding. Pressure casting is to make the molten metal fill the mold cavity under high pressure and high speed and die-casting. It is repeatedly in contact with the hot metal during the working process. Therefore, the die-casting mold is required to have high heat fatigue resistance, thermal conductivity wear resistance and corrosion resistance. , impact toughness, red hardness, good release properties, etc. Therefore, the surface treatment technology of die-casting molds is relatively high. In recent years, various new techniques for surface treatment of die-casting molds have emerged, but in general they can be divided into the following three categories: (1) Improvement techniques of traditional heat treatment processes; (2) Surface modification technology, including surface thermal diffusion treatment, surface phase transformation strengthening, electric spark strengthening technology, etc.; (3) coating technology, including electroless plating. 1. Improved technology of traditional heat treatment process The traditional heat treatment process for die-casting molds is quenching-tempering, and surface treatment techniques have been developed in the future. Because of the variety of materials that can be used as die-casting molds, the same surface treatment techniques and process applications can have different effects on different materials. Schkov recently proposed a substrate pretreatment technology for mold substrate and surface treatment technology. Based on the traditional process, a suitable processing technology is proposed for different mold materials to improve mold performance and improve mold life. Another development direction of heat treatment technology improvement is to combine the traditional heat treatment process with advanced surface treatment technology to improve the service life of the die casting mold. For example, carbonitriding by chemical heat treatment, combined with conventional quenching and tempering processes, NQN (ie, carbonitriding-quenching-carbonitriding) composite strengthening, not only obtains high surface hardness, but also effectively hardens. The layer depth is increased, the hardness gradient distribution of the layer is reasonable, the tempering stability and the corrosion resistance are improved, so that the surface quality and performance of the die-casting mold are greatly improved while obtaining good core performance. 2, surface modification technology 2.1. Surface thermal diffusion technology This type includes carburizing, nitriding, boronizing, carbonitriding, and sulfur-carbonitriding. 2.2, carburizing and carbonitriding carburizing process applied to cold, hot work and plastic mold surface strengthening, can improve the life of the mold. For example, 3Cr2W8V steel die-casting mold, first carburized, then quenched at 1140 ~ 1150 °C, tempered twice at 550 °C, surface hardness can reach HRC56 ~ 61, so that the die life of die-casting non-ferrous metals and their alloys increased by 1. 8 ~ 3.0 times. When carburizing is carried out, the main processes are solid powder carburizing, gas carburizing, vacuum carburizing, ion carburizing, and carbonitriding formed by adding nitrogen in a carburizing atmosphere. Among them, vacuum carburizing and ion carburizing are technologies developed in the past 20 years. The technology has the characteristics of fast percolation speed, uniform permeability, gentle carbon concentration gradient and small deformation of the workpiece, which will be on the mold surface, especially the precision mold. Surface treatment plays an increasingly important role. 2.3, nitriding and related low-temperature thermal expansion technology This type includes nitriding, ion nitriding, carbonitriding, oxygen-nitrogen osmosis, sulfur-nitrogen osmosis and ternary osmosis of sulfur, carbon, nitrogen, oxygen, nitrogen and sulfur And other methods. These methods are simple in process, strong in adaptability, low infiltration temperature (generally 480-600 ° C), small deformation of the workpiece, especially suitable for surface strengthening of precision molds, and high hardness and wear resistance of the nitride layer. Good anti-sticking performance. 3Cr2W8V steel die-casting mold, after quenching and tempering, nitriding at 520 ~ 540 °C, the service life is 2 to 3 times higher than that of non-nitriding mold. In the United States, the die-casting mold made of H13 steel is subjected to nitriding treatment, and tempering is used instead of tempering. The surface hardness is as high as HRC65-70, and the hardness of the core of the mold is low and the toughness is good, so that excellent synthesis is obtained. Mechanical properties. The nitriding process is a common process for the surface treatment of die-casting molds. However, when a thin and brittle white bright layer is present in the nitrided layer, it cannot resist the effect of alternating thermal stress, and it is easy to generate microcracks and reduce thermal fatigue resistance. Therefore, in the nitriding process, the process must be strictly controlled to avoid the generation of a brittle layer. Recently, foreign countries have proposed the use of secondary and multiple nitriding processes. The repeated nitriding method can decompose the nitride white bright layer which is easy to generate microcracks during the service process, increase the thickness of the nitriding layer, and at the same time, the surface of the mold has a thick residual stress layer, so that the life of the mold can be significantly improved. In addition, there are methods such as salt bath carbonitriding and salt bath sulfur-nitrogen carbonitriding. These processes are widely used in foreign countries and are more common in China. Rare. For example, the TFI+ABI process is immersed in a basic oxidizing salt bath after nitrocarburizing in a salt bath. The surface of the workpiece is oxidized and black, and its wear resistance, corrosion resistance and heat resistance are improved. The life of the aluminum alloy die-casting mold treated by this method is increased by several hundred hours. Another example is the oxynit process for nitriding after sulphur-nitrogen carbon co-infiltration developed in France. It is more suitable for non-ferrous metal die-casting molds. 2.4, boronizing due to the high hardness of the boronized layer (FeB: HV1800 ~ 2300, Fe2B: HV1300 ~ 1500), wear resistance and red hardness, as well as certain corrosion resistance and anti-adhesion, boronizing technology in the mold industry Get better application results. However, because the working conditions of the die-casting mold are very harsh, the boronizing process is less applied to the surface treatment of the die-casting mold. However, in recent years, an improved boronizing method has appeared, which solves the above problems and can be applied to the surface treatment of the die-casting mold. Such as multi-component, powder coating and so on. The method of boronizing the coating powder is to mix the boron compound and other infiltrating agent and apply it on the surface of the die-casting mold. After the liquid is volatilized, it is sealed and sealed according to the general powder boronizing method, and heated at 920 ° C for 8 hours. Air cold. This method can obtain a dense and uniform infiltration layer, and the hardness, wear resistance and bending strength of the surface of the mold are improved, and the service life of the mold is increased by more than 2 times on average. 2.5. Rare Earth Surface Strengthening In recent years, the method of adding rare earth elements in the surface strengthening of molds has been widely praised. This is because rare earth elements have many functions such as increasing the osmotic speed, strengthening the surface and purifying the surface. [13] Wear-resistant electrode, which has a great influence on improving the surface structure, surface physical, chemical and mechanical properties of the mold, and can improve the seepage. Speed, strengthen the surface, and form rare earth compounds. At the same time, it can eliminate the harmful effects of trace impurities distributed on the grain boundary, and play the role of strengthening and stabilizing the grain boundary of the mold cavity surface. In addition, the rare earth element acts on harmful elements in the steel to form a high melting point compound, and also suppresses the segregation of these harmful elements at the grain boundary, thereby reducing the brittleness of the deep layer and the like. The addition of rare earth elements in the surface strengthening treatment process of the die-casting mold can significantly improve the thickness of the infiltration layer and increase the surface hardness, and at the same time make the microstructure of the infiltration layer finely dispersed and the hardness gradient decreases, thereby making the mold wear resistance and resistance. The cold and hot fatigue properties are significantly improved, which greatly increases the life of the mold. At present, the treatment methods applied to the cavity surface of the die-casting mold include: rare earth carbon co-infiltration, rare earth carbonitriding, rare earth boron co-infiltration, rare earth boron-aluminum co-infiltration, rare earth soft nitriding, rare earth sulfur-nitrogen carbonitriding. 2.6. Laser surface treatment Laser surface treatment is to use a laser beam to heat the surface of the workpiece to rapidly melt a thin layer of a certain depth. At the same time, the alloying elements are applied to the surface of the workpiece by vacuum evaporation, electroplating, ion implantation, etc. It is fully fused with the base metal, and after condensation, an alloy layer having a special property of 10 to 1000 μm is obtained on the surface of the mold, and the cooling rate is equivalent to chill quenching. For example, the surface of H13 steel is treated by laser rapid melting process. The melting zone has high hardness and good thermal stability, and has high resistance to plastic deformation, which has obvious inhibitory effect on the initiation and propagation of fatigue cracks. Recently, Saha and Dahot used laser cladding of the VC layer on the H13 substrate. Studies have shown that the surface of the obtained mold is essentially a continuous, dense and non-porous VC steel composite coating, which is not only very strong. The oxidation resistance at 600 ° C, and has a strong ability to resist the reduction of molten metal [19]. 23 EDM cermet process In the continuous development of surface modification technology, an EDM process has emerged. Under the action of electric field, the process generates instantaneous high temperature and high pressure zones on the surface of the base metal, and simultaneously infiltrates the ionic cermet material to form metallurgical bonding of the surface, and the surface of the base metal also undergoes instantaneous phase transformation to form martensite and fine. Austenitic organization [20]. This process differs from soldering, as well as by sputtering or elemental infiltration, and should be a process in between. It makes good use of the high wear resistance, high temperature resistance and corrosion resistance of cermet materials, and the process is simple and the cost is low. It is a new way of surface treatment of die-casting molds. 3, coating technology As a kind of mold strengthening technology, the coating technology is mainly applied to the surface treatment of molds with relatively simple working conditions such as plastic molds, glass molds, rubber molds and stamping molds. Die-casting molds need to withstand the harsh environment where the thermal and thermal stresses alternate, so coating technology is generally not used to strengthen the surface of the die-casting mold. However, in recent years, it has been reported that the surface of the die-casting mold is strengthened by a chemical composite plating method to improve the anti-adhesion and mold release property of the mold surface. The method infiltrates the polytetrafluoroethylene particles on an aluminum-based die-casting mold and then performs (NiP)-polytetrafluoroethylene composite plating. Experiments prove that this method is working 4, both artistic and performance are feasible, greatly reducing the friction coefficient of the mold surface. Conclusion Mold press processing is an important part of mechanical manufacturing, and the level, quality and longevity of the mold are related to mold surface strengthening technology. With the advancement of science and technology, various mold surface treatment technologies have made great progress in recent years. It is manifested in: 1 improvement of traditional heat treatment process and its combination with other new processes; 2 surface modification technology, including carburizing, low temperature thermal diffusion (various nitriding, carbonitriding, ion nitriding, ternary Co-infiltration, etc., salt bath thermal diffusion, boronizing, rare earth surface strengthening, laser surface treatment and EDM cermet; 3 coating technology. However, for the die-casting molds with extremely harsh working conditions, the existing new surface treatment process can not meet the ever-increasing requirements, and more advanced technologies can be expected, and it is expected to be applied to the surface treatment of the die-casting molds. In view of the fact that surface treatment is one of the important means to improve the life of die-casting molds, surface treatment technology will play an important role in improving the overall level of die-casting mold production in China.

This afternoon,the audit of 2022 year of IATF16949:2016 certificate has brung to a successful-close. The total audit has taken 3 days.Although a few items need to be improved within the required -time,we have passed the audit successfully. The audit objectives are shown as follows. The audit teacher and the head of each department are in the summary meeting(shown as follow).

Recently, Bolang Metal has purchased one new precision 5 axles CNC machine. The machine is a mechanical and electrical integration type, which can only transmit power through the power cord. The machine consists of the main body, the high-voltage panel, and the coolant box,each subassembly is connected by electrical wires and hoses. The main model specifications are shown as follows:

White-Rodgers is a new client for our company developed in Jan.,2022.One of the part named cover,part No. is 00168727,has been successfully trial-produced today.The smallest hole diameter of this part is φ0.062'',the related experience is lacking for us,in the beginning the drilling tools break off frequently.Then, we consulted with the experienced suppliers and finally solved the problem.This product has air leakage test requirements,both the process requirements of die casting and the die casting die requirements are very high.

Over the years, drilling and attack center companies are exploring an ultrasonic vibration cutting mode (drilling and tapping machine) with a wide range of applications and reasonable processes, including research on the adaptability of machine tools. With the smooth resolution of these problems, it is expected that the micro-deep hole machining with smaller diameter will be better realized in the future, and the machining accuracy will be higher. High-speed and high-precision hole machining In addition to precision machining of the hole by CNC cutting method (drilling and tapping machine), the hole can be processed with high precision by boring and reaming. With the high speed of the machining center spindle, the boring tool can be used to perform high-speed precision machining of the hole. Cutting operations centered on milling tools are entering a high-speed, high-precision machining period. In the drilling operation of the drilling and attack center, high-speed steel twist drills are still widely used, but the gap between the processing precision and processing efficiency of the enterprises has gradually widened. NINGBO ZHENHAI BOLANG METAL PRODUCT FACTORY has relevant cnc equipment for small industrial CNC machine tools.

Recently, Bolang Metal has introduced one new precision CNC machine: S700Z1. S700Z1 high-speed precision CNC bushing lathe adopts horizontal one-shaped row cutter structure, three fixed drill pipes in the axial direction; the main shaft adopts elastic collet, and the automatic feeder is used to complete the automatic clamping of the shaft parts. It is equipped with a sub-clamp that can be fed in multiple times to complete the processing of extra-long stroke parts. At the same time, it is equipped with long and short parts. The spindle support uses high-precision imported bearings, and the feed axes are also imported. Precision bearings, precision ball screw pairs, linear rolling guides to ensure the accuracy of parts processing. The machine adopts brother numerical control system and supporting servo motor. The main shaft is equipped with brother high-power servo motor, which can complete precision thread processing. It is suitable for electronic communication, automobile motorcycle, instrumentation, optical instrument, packaging machinery, hardware. Continuous processing of high-precision, multi-variety, large-volume, small and medium-sized shaft parts in the home appliance industry. CF-08 high-speed automatic milling is a high-efficiency cam-centering automatic processing machine. It uses the perfect combination of ordinary geared motor and variable frequency speed control technology to control the camshaft speed, making the parts processing more efficient and convenient than similar cam machines. Reasonable, the spindle support is made of Nissan precision high quality bearings. The machine is suitable for fine processing of machinery parts such as iron, copper, aluminum and stainless steel in electronics, communication, automobile, instrumentation, optical instruments, packaging machinery, medical equipment, hardware and other industries.

1. Differentiating the meaning of the pressure casting and die casting (liquid forging) parts: 1, is a number of domestic agencies, including parts and the entire manufacturer. They undertake external parts and components, and then find some manufacturers in the country. Since the production processes of the two blanks are different, the current market price is not the same, and the latter is generally higher than the former. If you do not distinguish between the two types of roughs, if you press down on the casting at a low price when undertaking business quotation, there will be operational mistakes, which will affect the efficiency and even loss. 2, is a professional manufacturer of castings and forgings. Because the latter is die-casting, it can be manufactured using traditional die-casting technology and the business can be taken over. After the die-casting mold was opened, the billet produced by the die-casting process finally had a shrinkage shrinkage defect or an appearance defect, and the blank was unqualified, eventually causing undue loss. 2. The relationship between die forging, liquid forging and continuous casting and forging processes: The essence of the continuous casting and forging process is the continuous completion of casting styling and forging in a single set of tools on a single machine. The continuous casting and forging process is not a new process, and its principle has a long history. The most typical and simplest continuous casting and forging process is the familiar liquid forging (melt forging) process. The die-casting and forging process, graphically speaking, is a kind of specialized equipment that uses a higher degree of automation to produce liquid forgings that are as complex as ordinary die castings. Because of this, die-casting forgings and ordinary die-castings are not easy to separate in appearance. The quality of the blank produced by the continuous casting and forging process is similar to that of the "cast first and then forged" process. The first forging and forging processes are very common: two blanks are needed for the blank production, one for manual ordinary metal casting, and the other for precision forging using a friction press or a hydraulic press. The die-casting forging process is an internationally emerging process in recent years. Due to the limitation of patented technology, this process is still rare in China. A variety of blanks including sports car forging pistons, small cylinders, extreme sports motorcycle frame (6061 material), and small wheel hubs have been produced. 3. Die Casting Forging Process Description: The die-casting forging process is a process that is completed on a dedicated die-casting forging machine. Its basic process is: metal liquid is firstly filled into the mold cavity at a low speed or high speed. The mold has a movable cavity surface. It presses and forges with the cooling process of the molten metal to eliminate the shrinkage shrinkage of the blank. Loose defects also make the internal structure of the blank reach the forged broken grains. The overall mechanical properties of the blank have been significantly improved. In addition, the blank produced by this process has an outer surface finish of 7 (Ra1.6), and has a metallic luster like a cold extrusion process or a machined surface. Therefore, we call the die-casting forging process an "extremely-shaped forming process", which is a step further than "no cutting and less excess forming process". Another advantage of the die-casting die forging process is that, in addition to producing conventional casting materials, it can also use deformed alloys and forged alloys to produce very complex parts. These alloy grades include: hard aluminum super hard aluminum alloy, wrought aluminum alloy, such as LY11, LY12, 6061, 6063, LYC, LD, etc.). The tensile strength of these materials is almost twice as high as that of ordinary cast alloys. It is of more positive significance for aluminum alloy automobile wheels, frames, and other parts that are expected to be produced with higher-strength and impact-resistant materials. 4. How to distinguish the two blanks: From the appearance, it is difficult for us to distinguish the blanks produced by these two processes. If you see a machined part, it's even harder to tell. Therefore, we can only reverse the analysis and judgment: First, die castings are generally "structural parts", while die-casting die forgings are "functional parts." "Structure" is relative to "feature". The latter generally refers to to withstand the impact, high temperature, pressure, strength (force), and to surface treatment (such as anodizing), heat treatment (Solid-melting strengthening) and so on. Typical products are engine blocks, hubs, pistons, connecting rods, brake shoes, pneumatic or hydraulic valve bodies (such as the common three-position five-way valve). The former are such as door frames, instrument panels, and engine covers. The second is to judge from the material composition. Because die castings are generally cast alloys, for other grades of alloys, die casting and die forging processes are often used. The third is to judge from the processing requirements of the blank on its outer surface. Such as aluminum die castings, due to containing silicon, and the blank produced by the die casting process, the surface of the microscopic pores (commonly known as "water pattern"), the surface of this material after the anodizing will have "black spots." Therefore, if blanks require anodizing, such blanks will not be produced by ordinary die casting processes. The fourth is to judge from the metallographic organization. Die-casting and die-casting die forgings are very easy to distinguish on metallography. The former is a dendritic as-cast structure, and the latter is a forged structure of uniformly broken grains. 5. Eliminate some wrong ideas: 1. We cannot think that vacuum impregnation after die-casting can solve the shrinkage shrinkage and shrinkage defects of die castings, nor can we think that the vacuum die-casting process can be used to produce functional parts that can be produced by continuous casting and forging. When the technology in the industry has progressed, we must have a scientific attitude that advances with the times in terms of ideas and ideas. 2, vacuum die castings and ordinary die castings, there are the same shrinkage shrinkage defects; vacuum die casting, it is just a bit more than ordinary die casting in the auxiliary process of the process, the shrinkage due to the liquid metal shrinkage With shrinkage (its interior is vacuum, no gas), it is no way. Third, the most common mistake that professionals make is that although it is known that this blank can not be produced by ordinary die-casting technology, it is a process called [indirect and partial extrusion of reverse punch". They think that this process has the same effect as the liquid forging process. This is completely wrong. The essence of the [reverse punch extrusion" process is still a die-casting process. Only the type of [full forward projection punch forging" is the real liquid forging process. 6. Summary: It is very meaningful to distinguish between ordinary die castings and die casting forgings. Although the method to be mastered is not difficult, many of them are concepts and cognitive skills.

In recent years, with the further expansion of market awareness and the continuous improvement of business grades, domestic hardware measuring tools have continued to shine brightly. From visual inspection to simple measurement to precision measurement, advances in measurement technology have ensured progress in manufacturing technology to some extent. The famous scientist Mr. Qian Xuesen also pointed out: Information technology includes measurement technology, computer technology and communication technology. Measurement technology is the key and the foundation. Precision machining requires not only the precision and stability of the machine tool, but also the accuracy of the tools and fixtures. It also requires precision measuring instruments to calibrate and measure. Some are in the process of processing; others are detected afterwards. Precision machining requires not only the precision and stability of the machine tool, but also the accuracy of the tools and fixtures. It also requires precision measuring instruments to calibrate and measure. Industry expert Luo Baihui disclosed that taking the wind power industry as an example, the machining and testing of typical components such as turbine blades, rotor wheel slots, and turbine generator rotor embedded slots in power generation equipment are represented and reflected to some extent. The state-of-the-art cutting technology and the latest achievements and levels of CNC cutting tools, digital measurement technology and measuring instruments have attracted the attention of the tool manufacturing industry. It is gratifying that the domestic hardware measuring instrument manufacturers have increased their investment in digital display technology and digital display hardware product development in recent years, and have achieved great results. Domestic digital display tools have evolved from the simple bar LCD digital display of previous years to the more complex image display of surface dynamic liquid crystal dynamic simulation. The resolution of the digital video scale grid has been developed from 0.01 millimeter to 0.001 millimeter, and the accuracy and reliability of measurement have been improved. Have a significant increase. The continuous improvement of waterproof and dustproof performance also enhances the market competitiveness of domestic digital display devices. In the past 10 years, we have continuously strengthened our strengths in the development and manufacturing of precision instruments such as gear measuring instruments, surface roughness measuring instruments and contour measuring instruments. We have successfully developed the largest 2m CNC gear measuring instrument in China and become the most competitive precision in China. Measuring instrument manufacturer. The dual-frequency laser interferometer is a core product independently developed by the center. Now only this center has the technology to produce this equipment. Its successful development has changed China's long-term dependence on imports in this field. He just said proudly: The instrument's many functions have broken the foreign technology blockade, detection resolution of 0.02 microns, detection length of up to 20 meters. The price is much lower than similar foreign products. In the international arena, this instrument can compete with similar products in countries such as Britain and the United States. The director of the National Precision Tool Engineering Research Center and director of the Chengdu Tool Research Institute stated that so far, the center is The results of new types of tool materials, surface modification technologies for tool materials, gear meters, etc. have been at the leading level in the country. Through unremitting efforts, it has now possessed the most advanced production equipment for precision tools with independent intellectual property rights and established an industrialization base, which has enabled China's precision tools to achieve leap-forward development in terms of research and development, technological equipment and industrialization capabilities. The results have reached or reached the world advanced level. To enhance the comprehensive competitiveness of hardware companies, in addition to the above points, there are still many things to do. We have a long way to go, and our company team will not lose sight of the social responsibilities while pursuing profits. Only in this way can our business get a lasting and sustainable development.

Method for improving service life of die casting mould Due to the long production cycle, large investment, and high manufacturing precision, die-casting molds have a high cost, so it is hoped that the molds will have a higher service life. However, due to the influence of a series of internal and external factors such as materials and mechanical processing, the molds are prematurely invalidated and scrapped, resulting in great waste. The failure modes of die-casting molds are: sharp corners, corner cracking, splitting, hot cracking (cracking), wear, and erosion. The main causes of die-casting mold failure are: defects in the material itself, processing, use, maintenance and heat treatment. First, the material itself has defects It is well known that the conditions of use of die-casting molds are extremely harsh. Taking aluminum die casting as an example, the melting point of aluminum is 580-740°C. When used, the temperature of aluminum liquid is controlled at 650-720°C. In the case of die casting without preheating of the mold, the surface temperature of the cavity rises from room temperature to the liquid temperature, and the surface of the cavity is subjected to a great tensile stress. When molding the top piece, the cavity surface is subjected to great compressive stress. Thousands of die castings have cracks and other defects on the mold surface. It can be seen that the conditions for die-casting are quenching. Mold materials should use hot and cold fatigue resistance, fracture toughness, high thermal stability of the hot die steel. H13 (4Cr5MoV1Si) is currently widely used materials, according to reports, 80% of foreign cavity H13 are used, and now the country is still heavily used 3Cr2W8V, but 3Cr2W8VT_art performance is not good, poor thermal conductivity, high linear expansion coefficient, The work generates a lot of thermal stress, resulting in mold cracking or even cracking, and easy to decarburization when heating, reducing the wear resistance of the mold, it is a phase out steel. Maraging steel is suitable for molds that are resistant to thermal cracking and do not require high wear resistance and corrosion resistance. Tungsten-molybdenum and other heat-resistant alloys are limited to small inserts with severe thermal cracking and corrosion. Although these alloys are brittle and notched, they have the advantage of good thermal conductivity and the need for cooling without the need to set the thickness of the water channel. Die casting die casting mold has good adaptability. Therefore, under a reasonable heat treatment and production management, H13 still has satisfactory performance. The materials used to make the die-casting molds shall meet the design requirements from any aspect, and ensure that the die-casting molds reach the designed service life under their normal conditions of use. Therefore, prior to being put into production, a series of inspections should be conducted on the materials to prevent them from being defective, resulting in the early retirement of molds and the waste of processing costs. Common inspection methods include macroscopic corrosion inspection, metallographic inspection, and ultrasonic inspection. (1) Macroscopic corrosion inspection. Mainly inspect the porosity, segregation, cracks, cracks, non-metallic inclusions, cracks, and joints on the surface of the material. (2) metallographic examination. Mainly check the segregation of carbides on the grain boundary, the distribution state, the degree of crystal grains, and inclusions between grains. (3) Ultrasound examination. Mainly check the internal defects and size of the material. Second, the die casting mold processing, use, repair and maintenance The problems that should be paid attention to in the design of die casting molds have been introduced in detail in the die design manual. However, when determining the shot speed, the maximum speed should not exceed 100 m/s. The speed is too high, which promotes corrosion of the mold and increased deposits on the cavity and the core; but too low can easily cause defects in the casting. Therefore, the corresponding minimum injection speeds for magnesium, aluminum, and zinc are 27, 18, and 12 m/s. The maximum shot rate of cast aluminum should not exceed 53 m/s and the average shot rate is 43 m/s. During processing, thicker stencils cannot be superimposed to ensure their thickness. Because the steel plate is 1 times thicker and the bending deformation is reduced by 85%, the stack can only play a superposition. The same two plates with the same thickness as the veneer have 4 times the bending deformation of the veneer. In addition, special attention must be paid to ensuring concentricity in the processing of cooling waterways. If the head corners are not concentric with each other, the corners of the connection will crack during use. The surface of the cooling system should be smooth and it is best to leave no trace of machining. EDM is more and more widely used in the mold cavity processing, but the hardened layer remains on the surface of the processed cavity. This is due to the self-carburizing and quenching of the mold surface during processing. The thickness of the hardened layer is determined by the current intensity and frequency at the time of processing, deep during rough machining, and shallow during finishing. Regardless of the depth, the mold surface has a great stress. If the hardened layer is not removed or the stress is eliminated, cracks, pitting, and cracking will occur on the mold surface during use. Elimination of hardened layers or removal of stress can be used: 1 removal of the hardened layer by whetstone or grinding; 2 lower stress than the tempering temperature without reducing the hardness, which can significantly reduce the cavity surface stress. The mold should strictly control the casting process during use. Within the allowable range of the process, the temperature of the casting and casting of the aluminum liquid, the shot speed, and the preheating temperature of the mold are minimized. The preheating temperature of the aluminum die casting mold is increased from 100 to 130°C to 180 to 200°C, and the die life can be greatly improved.

According to the statistical data of industrial enterprises and the analysis of related national statistical data, the total output value of the machinery general parts industry in the first quarter of 2022 was 136 billion yuan, a year-on-year increase of 5.8%. Among them, the four professional developments of gears, springs, powder metallurgy, and transmission couplings are in good conditions, and the development of the two fasteners and chains is relatively weak. The general machinery spare parts industry was driven by the development of host equipment such as automotive equipment, rail transportation, aerospace, marine vessels, and robot manufacturing. The industry achieved relatively stable development. The supporting enterprises that have relatively close contact with the above-mentioned well-developed host equipment industry can basically meet their production requirements in September, while the orders for general enterprises are less. On the other hand, there are plenty of product orders for companies with strong corporate brand influence, early structural transformation and upgrading, and stable product quality. However, the general corporate product orders have a weak development momentum. The import and export of the industry showed a relatively strong development. The total value of imports and exports reached 16.25 billion U.S. dollars, a year-on-year increase of 14.9%. The total industry import volume was 9.798 billion U.S. dollars, an increase of 17.3% year-on-year; the total export volume was 6.453 billion U.S. dollars, an increase of 11.3% year-on-year, both of which achieved double-digit growth. The increase in imports was mainly driven by the significant increase in the volume of various gearbox imports in the gear industry. In the first half of the year, the import volume of gears was US$7.41 billion, an increase of 19.5% year-on-year, and accounted for 75.6 of the total import value of the industry. %; Professional imports of fasteners were 1.69 billion U.S. dollars, up 14.8% year-on-year; Imports of springs were 290 million U.S. dollars, up 13.1% year-on-year; Imports of the two specialties of the chain and transmission joints were negative year-on-year, respectively. It is -1.8% and -3.9%. Among the total export volume, the contribution of the gear professional is still the first in the industry, its export is 2.84 billion US dollars, an increase of 16.4% year-on-year; the export value of the fastener professional is 2.42 billion US dollars, an increase of 5.3%; chain professional Exports amounted to US$740 million, an increase of 9.8% year-on-year; spring exports were US$160 million, a year-on-year increase of 10%; drive linkage exports were US$270 million, a year-on-year increase of 23.6%, which is the largest year-on-year increase in exports in the industry. Professional. The economic development of the mechanical parts industry was relatively stable, and the development trend of import and export performance was generally better than that of the same period of last year. However, the development of various professions and enterprises is not balanced enough. It is still necessary to adhere to the attitude of active development, carefully review the situation, and constantly strive to open up the product market. At the same time, we must also adhere to independent innovation, adjust product structure, improve product quality, promote green manufacturing technologies, and promote the orderly development of corporate transformation and upgrading.

BOLANG will be in GIFA 2019 held in Dusseldorf, from JUN 25th to JUN 29th, our BOOTH NUMBER is 14-B16. Welcome to visiting us to have a face to face meeting!