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What milling cutter should be selected for processing high hardness materials?
Release time:
2021/11/16
With the continuous development of manufacturing industry, the application of difficult-to-process materials with high hardness, high wear resistance, high heat resistance and high chemical stability is increasing. In order to solve the problem of poor processing performance and difficult processing of difficult material parts, various new types of cutting tools such as carbide coated cutting tools, diamond, ceramics, cubic boron nitride and other superhard cutting tools are becoming more and more widely used. Through further theoretical research and processing practice, it is proved that the selection of suitable tool material, the determination of reasonable tool geometry parameters, the optimization and improvement of tool structure, and the selection of correct processing methods are effective ways to improve the processing efficiency of high hardness materials.
The characteristics of high hardness materials:
Common high hardness materials are: chilled cast iron, hardened steel, powder metallurgy materials and other special materials. Processing characteristics of high hardness materials:
1, high hardness (generally above HRC45, some can be as high as HRC68), high strength, small plasticity.
2. The blade is easy to break and wear. When cutting, the contact between the chip and the blade is short. The cutting force and cutting heat are concentrated near the blade edge, which is easy to break and wear the blade.
3, low thermal conductivity, cutting heat is difficult to take away through the chip, so the cutting force is large, the cutting temperature is very high, the tool wear is serious, easy to cause the knife or the edge.
4, in addition, in the processing of chilled cast iron, the edge of the workpiece is also easy to crumble, peeling.
When cutting such materials, if the cutting fluid is used for cooling, the tool may be subjected to thermal shock caused by intermittent heating-cooling, and the drastic change of temperature is easy to cause the carbide cutting edge to crack. Conversely, if the use of compressed air cooling, not only can the tool temperature remain constant, but also can be blown away from the cutting area, to avoid the high hardness of the chip of the secondary cutting action on the tool damage.
Requirements for cutting tools:
In order to realize the cutting of high hardness materials, the hardness of the tool must be much higher than the hardness of the material to be cut. In addition, due to the cutting of high hardness materials, the temperature of the cutter head is very high, so the cutting tool also needs to have the following characteristics:
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