As the main basic technology of manufacturing technology, CNC machining has made great progress at the end of the 20th century with the development of manufacturing technology. It has been characterized by the development of high-speed cutting, the development of new cutting processes and processing methods, and the provision of complete sets of technology. The new stage of development. It is an important industrial sector in the manufacturing industry, such as the automotive industry, aerospace industry, energy industry, military industry and emerging mold industry, electronics industry and other major processing technologies, and is also an important factor in the rapid development of these industrial sectors. Therefore, the United States, Germany, Japan and other countries with developed manufacturing maintain a rapid development momentum. As a necessary supporting equipment for CNC machine tools, metal cutting tools have entered the development stage of “CNC tools†driven by CNC machining technology, showing “three high and one special†(ie high efficiency, high precision, high reliability). Characteristics of sex and specialization).
Obviously, at the beginning of the 21st century, although near-net forming technology and stack forming technology are very promising new processes, the position of cutting processing as the main basic process of manufacturing technology will not change. From the current trend of manufacturing development, we can see that the development of manufacturing industry and the progress of human society pose a double challenge to cutting processing. This is also the main trend in the development of cutting technology in the early 21st century.
High-speed cutting will become a new process
The new cutting processes, such as dry cutting and hard cutting, which are represented by high-speed cutting, have shown many advantages and strong vitality, and become the main way for manufacturing technology to improve processing efficiency and quality and reduce costs.
Therefore, the development of new cutting processes such as high-speed cutting to promote the development of manufacturing technology is a new task facing modern cutting technology. Contemporary high-speed cutting is not a small increase in cutting speed. It is a major advancement in technology, including CNC machine tools, tool materials, coatings, tool structures, etc., in order to achieve cutting speed and advancement. By doubling the speed, the overall machining efficiency of the manufacturing industry can be significantly improved. Putting the current high-speed cutting level into practical use, improving the overall cutting efficiency of machining in China by one to two times, and narrowing the gap with industrial developed countries, is the goal and face of professionals engaged in cutting and tooling technology in the new century in China. A major challenge.
Hard cutting is an application field of high-speed cutting technology, which is to use hardened parts with single-edged or multi-blade tools. It has higher efficiency, better flexibility, simple process and less investment than traditional grinding. It has been used in some applications. The field produces better results. In the automotive industry, the cbn tool is used to process the inner hole of 20crmo5 hardened gear (60hrc) instead of grinding, and the surface roughness can reach 0.22μm, which has become a new process promoted by the domestic and international automotive industry.
Innovative processing technology
For a long time, difficult-to-machine materials such as austenitic stainless steel, high manganese steel, hardened steel, composite materials, wear-resistant cast iron, etc. have always been a problem in cutting processing, with low cutting efficiency and short tool life. With the development of the manufacturing industry, the use of these materials will increase rapidly in the 21st century, and the contradiction of processing will become more prominent. At the same time, the material composition of the product will be continuously optimized, new engineering materials will continue to come out, and the adoption of each new material puts new demands on the cutting process. For example, in the automotive industry where machining is concentrated, the proportion of silicon-aluminum alloy in engine and transmission parts continues to increase, and magnesium alloys and new high-strength cast irons are introduced to reduce the weight and energy consumption of automobiles. In the aerospace industry, the application ratio and processing difficulty of difficult-to-machine materials such as titanium alloys, nickel-based alloys, superalloys, and ceramics will also increase. The ability to process these materials efficiently is directly related to the development speed of China's automotive, aerospace, energy and other important industrial sectors and the overall level of manufacturing, which is the biggest challenge to cutting technology. We must explore from now on to fundamentally solve the century-long problems caused by the large-scale use of difficult-to-machine materials and the diversification of their varieties, innovative processing techniques, and the development of new "blades" and processing methods including lasers.
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Square Cut Nails
The square section of a cut nail resists attempts at twisting the wood which can reduced movement helps keep the nailed structure stable. The square nail shank has a tapered section for increasing connecting area. Therefore, an excellent holding force is formed without splitting the fastening material. These special nails have a solid steel structure and are commonly used in wooden boat building and other hardwood construction projects.
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