What milling cutter should be selected for machining high hardness materials
- Categories:carbide end mills news
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- Time of issue:2022-05-11 13:49
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(Summary description)Selecting appropriate tool material, determining reasonable tool geometry parameters, optimizing and improving the tool structure,
What milling cutter should be selected for machining high hardness materials
(Summary description)Selecting appropriate tool material, determining reasonable tool geometry parameters, optimizing and improving the tool structure,
- Categories:carbide end mills news
- Author:
- Origin:
- Time of issue:2022-05-11 13:49
- Views:
Selecting appropriate tool material, determining reasonable tool geometry parameters, optimizing and improving the tool structure, and selecting the correct machining method are effective ways to improve the machining efficiency of the tool in machining 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 and small plasticity.
2. The cutting edge is easy to be broken and worn. The contact between the chip and the cutting edge is short during cutting, and the cutting force and cutting heat are concentrated near the cutting edge, which is easy to cause the cutting edge to break and wear.
3. The thermal conductivity is low, and the cutting heat is difficult to be taken away by the chips, so the cutting force is large, the cutting temperature is high, and the tool wear is serious, which is easy to cause knife cutting or chipping.
4. In addition, when processing chilled cast iron, the edge of the workpiece is easy to crumble and peel off.
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 temperature change may easily cause the carbide cutting edge to chip. On the contrary, if compressed air is used for cooling, not only the temperature of the tool can be kept constant, but also the chips can be blown away from the cutting area to avoid damage to the tool due to the secondary cutting action of the high-hardness chips.
Requirements for cutting tools:
In order to realize the machining of high hardness materials, the hardness of the tool must be much higher than that of the material being cut. In addition, due to the very high temperature of the tool tip when cutting high-hardness materials, the cutting tool needs to have the following characteristics:
1. Strong plastic deformation resistance, that is, good high temperature hardness;
2. Good chemical stability, that is, no chemical reaction with the material to be cut, oxygen, cutting fluid, etc., and no thermal decomposition;
3. The thermal conductivity is very good, that is, the high temperature cutter head will not be damaged due to thermal shock.
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