Difficulties and Solutions of Stainless Steel Parts CNC Machining

Difficulties and Solutions of Stainless Steel Parts CNC Machining

We should all encounter the same problem when we process (CNC turning & milling) stainless steel parts: stainless steel parts are difficult to process; as everyone knows, the reason for the difficulty in machining is also the choice of tools. Let me tell you what materials the tools are made of, and how difficult it is to process stainless steel. A few reasons and solutions:

First. the choice of cutting tools:

For turning stainless steel parts on an automatic lathe, the commonly used carbide tool materials are: YG6, YG8, YT15, YT30, YW1, YW2 and other materials; commonly used high-speed steel tools are: W18Cr4V, W6M05Cr4V2AL and other materials.

Second. the selection of the geometric angle and structure of the tool is also particularly important:

Rake angle: Generally, the rake angle of the turning stainless steel tool is 10°~20°.

Rear angle: generally 5°~8° is more suitable, and the maximum is less than 10°.

Blade inclination: generally choose λ to be -10°～30°.

The surface roughness of the cutting edge should not be greater than Ra0.4～Ra0.2.

Third. The difficulties of processing stainless steel parts are as follows:

1. The machining hardness causes the tool to wear quickly and it is difficult to remove chips.

2. Low thermal conductivity causes plastic deformation of the cutting edge and faster tool wear.

3. The built-up edge is likely to cause small pieces of powder to stay on the cutting edge and cause a bad machined surface.

4. The chemical relationship between the tool and the material to be processed causes work hardening and low thermal conductivity of the material to be processed, which not only easily causes unusual wear, but also causes tool chipping and abnormal breakage.

Fourth, the solutions to the processing difficulties are as follows:

1. Use a tool with high thermal conductivity.

2. Sharp cutting edge line: The chip breaker has a wider margin, which can reduce the cutting pressure, so that the chip removal can be well controlled.

3. Appropriate cutting conditions: Improper machining conditions will reduce the service life of the tool.

4. Select the appropriate tool: the stainless steel tool should have excellent toughness, and the cutting edge strength and the bonding force of the coating film should also be relatively high.

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