With the substantial increase in the demand for important equipment manufacturing industries such as national defense, aviation, high-speed rail and automobiles, China's machine tools have also achieved rapid development, and machine tool technology has made remarkable progress in high-speed, composite, precision, multi-axis and other aspects. And a series of breakthroughs.
It can be said that the level, variety and production capacity of the machine tool directly reflect the comprehensive strength of a country's industry, and the birth of China's machine tools is slightly lagging behind the United States and Germany. After nearly half of the world's development, Chinese machine tools lag far behind Germany. In the United States, Japan and other countries, domestic machine tools are mainly low-end economy and mid-range popular machine tools, 70% to 80% of the machine tool market share, 90% of the system popularization and advanced type are occupied by foreign companies. Local machine tools still have a big gap with foreign machine tools in terms of accuracy and reliability.
At present, in the machine tool products, China's low-end products have certain strength, but high-end machine tools are still short-board, and high-end machine tools are necessary for the four major fields of aerospace, automotive, shipbuilding and power generation equipment manufacturing. It is necessary, although the country has implemented the "high-end CNC machine tools and basic manufacturing equipment" technology major projects, and plans to achieve 80% of the high-end CNC machine tools and basic manufacturing equipment required for the four major areas by 2020, but only the Jiji machine tool is currently large. A high-efficiency CNC automatic stamping production line has successfully realized commercialization, and it is still necessary to continue efforts on key components and high-end CNC systems.
Chen Huiren, executive vice president and secretary general of the China Machine Tool Industry Association, said that only improving the technical level is the way out. In this regard, China put forward a series of suggestions for the development of machine tools in 2014: in research and development, the implementation of innovative development strategies based on the existing special support of the country, with the theme of enterprises as the driving force, in view of the large investment and slow effect of machine tools. The industry alone cannot achieve long-term development by its own efforts. It requires a number of enterprises to participate in common technology research and development, and at the same time introduce scientific research institutions to participate in the implementation of public-private partnerships (PPP) to promote research and development; national level needs to increase basic research input and research and development talents. to cultivate.
2 The machine tool industry must adjust the existing industrial structure and exert high-end on the basis of the existing mid-end results. On the one hand, it needs to face the competitive pressure of foreign products and joint-venture products to squeeze the domestic mid-end market. On the other hand, it is necessary to increase research and development. Squeeze into the high-end market and get rid of the grim situation that is subject to people.
In the future, with the increasing emphasis on domestic high-end machine tools, local machine tool brands will usher in a new period of development after strengthening talent training.
(Finish)Surface grinding is used to produce a smooth finish on flat surfaces. It is a widely used abrasive machining process in which a spinning wheel covered in rough particles (grinding wheel) cuts chips of metallic or nonmetallic substance from a workpiece, making a face of it flat or smooth.
Surface grinding is the most common of the grinding operations. It is a finishing process that uses a rotating abrasive wheel to smooth the flat surface of metallic or nonmetallic materials to give them a more refined look by removing the oxide layer and impurities on work piece surfaces. This will also attain a desired surface for a functional purpose.
The surface grinder is composed of an abrasive wheel, a workholding device known as a chuck, and a reciprocating or rotary table. The chuck holds the material in place while it is being worked on. It can do this one of two ways: ferromagnetic pieces are held in place by a magnetic chuck, while non-ferromagnetic and nonmetallic pieces are held in place by vacuum or mechanical means. A machine vise (made from ferromagnetic steel or cast iron) placed on the magnetic chuck can be used to hold non-ferromagnetic workpieces if only a magnetic chuck is available.
Factors to consider in surface grinding are the material of the grinding wheel and the material of the piece being worked on.
Typical workpiece materials include cast iron and mild steel. These two materials don't tend to clog the grinding wheel while being processed. Other materials are aluminum, stainless steel, brass and some plastics. When grinding at high temperatures, the material tends to become weakened and is more inclined to corrode. This can also result in a loss of magnetism in materials where this is applicable.
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