In turning-milling composite processing, tool wear is often caused by one reason and a comprehensive effect. Under different cnc machining conditions, the main factors that cause tool wear are also different, mainly including the following points:
1. Abrasive wear
In the cutting process, the cutting chips and the high-hardness smiling hard point first-level built-up tumors contained in the workpiece material can be carved on the surface of the tool with different depths of grooves. This is hard point wear, also known as abrasive wear.
When the turning and milling process uses high-speed steel end mills for cutting, because the hardness of the high-speed steel tools is not high compared with that of the cemented carbide tools, and the cutting speed is low, the heat resistance is poor, so when the turning and milling combined machining is in the cutting When the temperature is not high, abrasive wear becomes the most significant cause of wear on high-speed steel tools
2. Diffusion wear
At high cutting temperatures, the tool surface is in contact with the cut workpiece and chip surface, and the chemical elements of the tool and the workpiece diffuse to each other, changing the composition and structure of the original material, weakening the performance of the tool material, and accelerating the wear process. Diffusion wear mainly occurs during high-speed cutting, so the cutting temperature is very high at this time, and the element diffusion rate is high. At the same time, as the cutting speed increases, the degree of diffusion wear increases.
3. Oxidative wear
The slight oxidation of the tool surface is inherently beneficial to reduce tool wear. This is because the existence of the oxide film can avoid the direct contact between the tool-chips and the tool-workpiece to reduce adhesion. However, when the laser cutting temperature is high, the oxidation of the tool material will proceed violently, forming a series of soft oxides. These oxides are stolen by the chips or the workpiece, resulting in the loss of the tool material, which constitutes turning and milling. Oxidation wear in composite cnc machining
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