Development of cutting tool coating technology at home and abroad (8)

(4) The lack of after-sales service has restricted the promotion and application of domestic coating equipment. So far, most domestic coating equipment manufacturers have not been able to provide complete tool coating technology (including pre-treatment process, coating process, post-coating process). , detection technology, coating tool application technology, etc.), this technology incompleteness brings many technical problems to the user's production; in addition, because the equipment manufacturer can not provide long-term technical services, it is difficult to ensure long-term stability of domestic coating equipment. Normal use, which greatly limits the promotion and application of PVD coating equipment.

(5) Unstable coating quality restricts the promotion and application of coating technology. The high cost of imported equipment leads to high coating prices, and the coating cost can even exceed 50% of the tool price. Due to different introduction channels, equipment selection basis Different, the process level of the equipment is quite different, which affects the use effect of the coating tool. Due to the unstable quality of the domestic coating tool, the inspection standard of the coating tool is incomplete, so the coating price is high and the coating is applied in the application field. The unfavorable impression of unstable quality and improved tool performance after coating seriously affects the promotion and application of tool coating technology and rapid development.

(6) The low level of domestic mechanical processing restricts the rapid development of coating technology. In the 1980s, the application of CNC machine tools in China was still very limited, the machining was still at a low level, and the application of high-speed steel tools accounted for all the tools. More than 80% of the cemented carbide tools are still mainly based on welding tools, and the indexable inserts are mainly made of turning tools (usually using CVD coating), and the whole solid carbide end mills, drills, reamers, etc. Less, so the requirements for PVD carbide tool coating are not very urgent, which also affects the further development of coating technology to a certain extent.

Suggestions <br> <br> With the development of China's automotive, aviation, aerospace, heavy machinery and other industries as well as the rapid spread of CNC machine tools, machining of high-speed machining technology is moving in the direction of the development of green manufacturing, high-speed hobbing, The application of high-speed milling and dry cutting processes places higher demands on tool coating technology. Taking gear high-speed hobbing as an example, the advanced process requires the use of the HoS2 soft coating technology of the hob. Compared with the TiN coating, the service life can be more than doubled. In high-speed milling, carbide milling tools are mostly TiAlN, TiAlCN or TiNAlN coatings, and a single TiN coating is not suitable for such processing. Market demand has forced domestic countries to accelerate the research and development of new PVD technologies.

The author believes that in order to achieve rapid and orderly development of China's new PVD coating technology, efforts should be made to do the following:

(1) Strengthening the planning and management tools of the project The industry management department should strengthen the planning and management of PVD coating projects, clarify the short, medium and long-term development goals of China's new PVD coating technology, and establish a planned and uninterrupted development policy. And through the organic combination of "official, production, learning, research, business", the project has both policy support and financial support. China has also had successful experience in this respect: in the mid-eighties, in order to build on the basis of the introduction and improve the overall level of coating technology in the tool industry, the former Machine Tool Division of the Ministry of Machinery Industry organized the whole industry to introduce equipment. The technical research and development of the hot cathode arc magnetron plasma coating machine has been successfully promoted and applied in the tool industry, and thus led to the popularization of domestic TiN coating tools.

(2) Establish a unified research, development, and service system to establish a unified research, development, and service system. According to the development trend of coating technology and domestic and international market demand, systematically introduce international advanced technology and strengthen the digestion and absorption of imported technologies. And collaborative research work, gradually enhance self-development capabilities, form patented technology, and ultimately achieve the purpose of meeting domestic market demand and participating in international market competition.

(3) Establish industry standards for tool coating technology Establish industry inspection standards for coating equipment and coating tools, strictly control coating tool quality, and ensure large-scale application and application of coating technology.

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