Deng Fuming, Director of the Institute of Superhard Tool Materials, China University of Mining and Technology (Beijing) , Development of High Speed ​​Cutting Technology High Speed ​​Cutting (HSC) usually means much higher than conventional cutting speed and feed rate (≥ 5-10 times the speed of an advanced manufacturing technology for efficient processing. The theory of high-speed cutting theory was proposed by the German physicist Dr. Salomon in 1931. 
Confirmation and development of Salomon's high-speed cutting theory: 1 "Rail-cutting" test of Lockheed RLVaughan; 2 American GE participated in "high-speed cutting" research in the early 1970s; 3 Processing of Ricking of American Lockheed Company Center and "High Speed ​​Cutting Technology Manual"; 4 Professor H. Schulz of the Technical University of Darmstadt, Germany, "High Speed ​​Cutting". As a modern advanced manufacturing process, high-speed cutting technology has been promoted and used in developed countries abroad; as a world manufacturing power, China has been developing vigorously as a national development strategy in recent years. Second, high-speed cutting, CNC machine tools and super-hard tool development relationship High-speed CNC machine tools, high-speed cutting tools and high-speed cutting technology are the three key technologies to achieve high-speed cutting. 
Development statistics of high-speed CNC machine tools in foreign exhibitions 
PCBN tool global market growth High-speed cutting theory to technology application results - high-speed CNC machine tools, machining centers, flexible manufacturing systems 1 CNC machine tools - the first revolution of the machine tool industry; 2 high-speed CNC machine tools - the second machine tool industry Second revolution; 3 machining center - further development of high-speed CNC machine tools; 4 flexible manufacturing system - the third revolution of the machine tool industry. Ordinary machine tool cutting time 70% for auxiliary time - loading and unloading, measuring, tool changing, adjusting machine tools, etc.; CNC machine tools - shortening tool change time, speeding up the free-range action, shortening the auxiliary time; High-speed CNC machine tools - improving cutting Speed, reducing cutting time. 
Figure 3 Changes in the processing time of forty years. Flexible manufacturing systems – shortening the development cycle of new products and speeding up product replacement. 
Figure 4: Changes in market demand and product production capacity during the product production cycle Superhard tools - the development direction of high-speed cutting tools - precision and efficient cutting tools; - the best processing tools for aluminum alloy engines in the automotive industry; - modern advanced Cutting processes such as "dry cutting", "hard cutting", "car (milling) grinding" carrier; - green, environmentally friendly, resource-saving, energy-saving new tools; superhard tools more obvious The basic characteristics of "high efficiency, precision and flexibility" of high-speed cutting technology represent the development direction of modern high-efficiency high-speed cutting technology. III. Problems in the development of PCBN high-speed cutting tools The excellent physical and mechanical properties of PCBN and its advanced cutting processes such as “car grindingâ€, “hard processing†and “dry cutting†are recognized as efficient in the 21st century. , environmental protection and resources, energy-saving cutting tools. Problem 1 - The high-speed cutting speed of PCBN tools has become the main technical bottleneck in the development of high-speed cutting technology worldwide. 
Figure 4 Relationship between cutting force and cutting speed. Al-10%Si alloy; cutting depth 2mm, feed 0.15mm/tooth dry processing. 
Fig. 5 Experimental results of cutting force and cutting speed when PCBN tool cuts cast iron Problem 2——The surface precision problem in high-speed cutting of PCBN tool has become another obstacle in the high-speed cutting of PCBN tool. 
Problem 3 - The table residual stress problem in high-speed cutting of PCBN tools is a technical problem that must be solved in the high-speed cutting of PCBN tools. 
Fourth, the problem raised and academic ideas 1, the problem raised - the high-speed cutting principle of PCBN tools and the "metal softening effect" of hard dry cutting. When cutting at high speed, the chips take away a lot of cutting heat, and the cutting temperature on the surface of the workpiece is greatly reduced. It is contrary to the “metal softening effect†of hard dry cutting. Therefore, to make full use of its “metal softening effectâ€, it is necessary to increase the cutting feed rate. The result will be an increase in cutting force. The existing bonded PCBN tool Can not meet its service conditions. Therefore, high requirements are placed on the high temperature mechanical properties of the new PCBN tools. It must have high hardness and wear resistance, as well as high strength and impact toughness. 2, academic thinking If the high temperature mechanical properties of the new PCBN tool can meet the requirements of its service conditions, the use of increased cutting feed is more reasonable, more in line with the concept of modern high-speed cutting. V. Difficulties and Challenges 1. One of the key points of the main attack How to use the ultra-high pressure sintering technology to realize the direct bonding of CBN-CBN between CBN grains, control the grain boundary structure and grain size to improve the high temperature mechanical properties of the sintered body. This requires a deeper understanding of the basic scientific problems of CBN high-pressure reaction sintering behavior, transformation mechanism and coalescence mechanism, and polycrystalline grain boundary structure and mechanical behavior. 2, the main key of the two high-speed hard cutting pure PCBN tool design to solve the key technical problem is how to high-speed hard cutting conditions and pure PCBN tool material high temperature mechanical properties, proposed tool structural design theory and optimized geometry The parameters are designed to design a new pure PCBN high-speed cutting tool with long service life and safety, which can solve the problem of safety, stability and reliability of pure PCBN tools during high-speed hard cutting. Therefore, it is necessary to deeply understand the various physical phenomena such as mechanical, thermal, friction and wear that will occur during the cutting process, and to understand the chip shape and formation mechanism under different feed conditions, cutting force characteristics, cutting heat and cutting temperature. The law of change, the form of the friction and wear of the tool, the damage characteristics and the damage mechanism apply the basic theoretical issues. In recent years, China National Mining Corporation has been engaged in the industrialization and co-construction project of the Beijing Municipal Education Commission, "Research and Development of High-efficiency High-speed Superhard Cutting Tools", Beijing Science and Technology Personnel Service Enterprise Action Plan, "Industrial Development of High-Efficiency High-Speed ​​Super-hard Cutting Tools", and With the support of the key industrial project of “large pure PCBN tool material and high-speed hard cutting technologyâ€, the exploration and preparation of high-performance pure PCBN tool materials, as well as the theoretical research of pure PCBN tool design and the basic research of high-speed hard cutting technology In terms of preliminary research progress, it is possible to break through the development bottleneck of PCBN cutting speed and provide theoretical basis and technical support for the development of high-speed hard cutting technology. Recent studies have shown that the new pure PCBN exhibits high hardness and fracture strength over a range of temperatures, and the flexural strength does not decrease but increases after the temperature rises to a certain value. This indicates that the new pure PCBN tool will be able to solve the problems associated with high-speed hard dry cutting applications of traditional PCBN tools. VI. Conclusion The development and promotion of high-purity PCBN high-speed cutting tools will promote the development of China's high-speed hard cutting technology, not only to promote the upgrading of related manufacturing industry products, to enhance the competitiveness of China's manufacturing products, but also to improve China's green cutting technology. The application ratio, reducing the negative impact of cutting on the environment, and energy conservation and emission reduction in the manufacturing industry play an important role. High Bay Light,High Bay Lamp,Highbay Light With Sensor,Outdoor High Bay Light
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