The current situation and development trend of hig

2022-10-16
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The current situation and development trend of high-speed machining system engineering technology in China (I)

I. Introduction

the concept of high-speed machining has three levels. For some mechanical parts, high-speed machining is to process at a faster production pace. One production cycle: 7 basic production links: part feeding → positioning and clamping → tool fast forward → tool feeding (detection) → tool fast backward → tool loosening and unloading → quality detection. High speed cutting refers to that the cutting motion (or movement) speed of the cutting edge of the tool relative to the surface of the part is 5 ~ 10 times faster than that of ordinary cutting, which is mainly reflected in the three links of tool fast forward, tool forward and fast backward. It is a subsystem of high-speed machining system technology. For the whole automatic production line, the characterization of high-speed processing is to carry out production and processing with a shorter and faster production pace with a simple process flow. This requires breaking through the traditional concept of machining, reforming the original processing technology (mode) on the premise of ensuring product quality, and shortening the process flow of the whole production line as far as possible: or using one station with multiple processes, one knife with multiple edges, or turning, reaming, milling instead of grinding, or broaching, rubbing, extrusion, rolling processing technology (mode) instead of rolling, inserting, milling and other processes (mode). For a product, high-speed processing also means that enterprises should complete all kinds of information collection and processing, design and development, processing and manufacturing, marketing and feedback related information of R & D products with a shorter production cycle. This has something in common with the agile manufacturing engineering concept

Although high-efficiency machining and high-speed machining are one word different, the author believes that there is a great difference in connotation between them: Generally speaking, high-efficiency machining refers to the rapid and economical removal of the blank allowance of parts within a predetermined time according to the different characteristics and requirements of parts on the premise of ensuring the quality of parts. High speed cutting is one of the processing technologies. High efficiency processing technology also includes less or no cutting processing technology (rubbing, extrusion, rolling processing technology), special processing technology (dissolution, melting, compounding, synthesis, stacking, special machining, etc.)

high speed machining system engineering technology came into being in the modern dynamic and changeable global market economic environment. In the fierce market competition, enterprises are required to have high product quality, low cost, fast listing, good service, clean environment and timely product innovation and upgrading. Therefore, before using the equipment, the sealing performance of the equipment should be checked to drive the continuous development of high-speed processing technology. Since the 1980s, high-speed machining technology has gradually developed into a comprehensive system engineering technology based on traditional metal (non-metal) cutting technology, automatic control technology, information technology and modern management technology. It has been widely used in production process manufacturing enterprises (such as modern car and automobile manufacturing enterprises). With the increasing social demand for personalized products, their production conditions are multi variety, medium and small batch manufacturing and processing (in the machinery manufacturing industry, this production mode will account for about 70% of the total output value). High speed machining technology will be further applied and developed in discrete or mixed production process enterprises (such as mold, energy equipment, shipbuilding, aerospace and other manufacturing enterprises)

At the end of the 20th century, China carried out reform and opening up, reformed the planned economic system, and gradually built a socialist market economic system with Chinese characteristics. Practical high-speed machining system engineering technology has been widely used in China's machinery manufacturing industry with the introduction of advanced CNC automatic production lines, cutting tools (tools), CNC machine tools (equipment), and enterprises have also integrated the corresponding modern management mode and concept. Entrepreneurs are increasingly aware of the important position and role of modern enterprise management system, mechanism and modern information technology in the future sustainable development of enterprises and market competition. The socialist market economic environment in China not only promotes the transformation of enterprises, technological transformation and adjustment of industry and product structure, but also shows a good and broad prospect for enterprises to apply and develop high-speed machining system engineering technology

second, the introduction of high-speed machining technology in car CNC automatic production lines since the 1980s, China has successively introduced a number of more advanced car CNC automatic production lines from Germany, the United States, France and Japan, which can be connected separately according to the different use voltage of samples, so that China's car manufacturing industry has achieved unprecedented development. Among them, the typical ones are FAW Volkswagen jetta cars from Germany and Shanghai Volkswagen Santana cars. More enterprises also set their eyes on the upcoming Asian aluminum event production line, and their technical level is at the international level in the mid-1990s

the automatic production line of FAW Volkswagen Jetta car is composed of high-speed production lines such as stamping, welding, coating, final assembly, engine and driver. The concurrent engineering management mode and management technology of Volkswagen AG were introduced at the same time, and various automatic lines were operated, with an annual output of 150000 cars and a manufacturing pace of 1.5 minutes per car. Among them, the engine and driver production line has a total of 627 various machining equipment, 253 imported and 374 domestic, which are basically CNC rigid automatic production lines. There are 9 kinds of self-produced engine parts, 27 kinds of transmission parts, and the rest are social supporting. The annual output is 270000 engines and 180000 transmissions. The production of 4-cylinder, 6-cylinder Jetta and Audi five valve EFI Engines and supporting drivers at the international level in the 1990s has a certain gap of 30 ~ 40 seconds/set in the field of 3 yuan compared with Japan and South Korea. The production line adopts air-cooled dry cutting technology, and its machining process reflects the most advanced technical level in the contemporary car manufacturing industry

the blanks of key parts of engines and transmissions of Jetta and Audi cars of FAW Volkswagen are high-strength cast iron, cast aluminum and precision die forged structural steel parts formed by precision casting, and some parts adopt precision powder metallurgy sintering forming process. Its high-speed machining technology requires that in the process of batch production, the machinability of materials is good and stable, and the cutting allowance of parts blank is controlled within 1.2 ~ 4mm ± 0.3mm. At the beginning of the production line, the parts are imported. Since 1997, relevant domestic enterprises have successively overcome the technical problems of precision forming technology, chemical element selection and heat treatment technology of parts and materials in batch production, aiming to achieve the goal of high-speed machining automatic production line (Technology) for parts and blank materials

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