At present, in the global machining industry, Japanese machine tools and cutting tools have been highly praised for their excellent performance and quality, and are widely used. For indexable inserts, more than half of the coated grades are used to ensure a balance between wear resistance and toughness of the cutting edge.
Although the coated tools produced in Japan entered the international market late, due to continuous investment in advanced technology, it has entered the leading position in the world of coated tools. Japanese tool manufacturers are working day and night to develop new technologies and invest in the production of coated tools. This article introduces the development of coated tool technology by taking the new technology developed and applied by Mitsubishi Materials as an example.
1 See the technical development prospects of coated tools from the market demand
From the perspective of improving product accuracy and quality and reducing environmental pollution, Japan's domestic machinery manufacturing industry has launched a vigorous production technology and processing technology innovation at the production site.
However, in the process of innovation in processing technology, some properties of coated tools have not fully met the requirements of users, and chip bonding, which affects tool life, is one of them. That is to say, although the coated tool has made great strides in wear resistance and chipping resistance, it is not advanced enough to overcome the chip sticking phenomenon to improve performance. This damage caused by the chip bonding phenomenon occurs in the processing of difficult-to-cut materials typified by stainless steel and ductile iron. Because it is abnormally worn and unpredictable, the tool life changes a lot. Due to such unstable factors, it is usually necessary to set the number of machinable workpieces to be low during processing, which affects the reduction of processing cost to some extent.
Therefore, it is particularly important to improve the surface smoothness of the cutting edge of the tool to prevent the tool from sticking to the material to be cut, thereby obtaining a cutting insert with improved machining performance. Although these surface smoothing techniques are aimed at maximizing the wear resistance of the coating material itself and improving the processing stability, the strategies and methods adopted by each company are different, some are mechanical methods, and some are mechanical. This is achieved by improving the coating structure to obtain a smooth cutting edge.
2 Products for smooth surface technology
In the range of processing speeds commonly used for CVD coated inserts, most of the base material is coated with an A12O3 film with excellent thermal stability because the cutting edge is subjected to a high temperature of 500 ° C or higher. The A12O3 coating is a crystalline ceramic. If it is applied too thick to improve the wear resistance, the unevenness of the surface of the coating will increase and the surface roughness will increase. During the cutting process, the material to be cut is likely to adhere to the surface of the tool, and it is difficult to effectively disperse the machining impact force during intermittent cutting, which may easily cause abnormal damage such as built-up edge and chipping.
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