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What milling cutter should be selected for 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:
Release time:
2022-08-08
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.
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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