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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.