Tools wear at high temperature conditions by the workpiece in the cutting tool, the friction of the chips, so that the tool material gradually wear or breakage of the phenomenon appears. Research tool wear causes prevent premature excessive tool wear and how to extend cemented carbide tool life, which is affecting the efficiency of production, processing costs and processing quality is an important topic.

Cemented carbide tool life T is defined as the total cutting tool wear reaches a predetermined standard time (MIM), factors affecting the tool life.

1．Cutting speed Vc: improve the cutting speed Vc, the cutting temperature increases, increased wear and tear, so that the tool life T reduce.

Effects of Cutting Speed on Cemented Carbide Tool Life

Wear curve under different cutting speeds υc1>υc2>υc3>υc4 ... relationships between cutting time T and wear VB

2.Amount ? feed and cutting depth αp: ? and αp increases are reduced tool life, but ? increases, more cutting temperature, so a greater impact on T; αp increases, improved heat dissipation conditions, so the cutting temperature rise less, therefore less impact on cemented carbide tool life.

3. The geometric parameters of the tool: the tool geometry parameters affect cemented carbide tool life: rake angle, the main declination, vice declination and nose radius. Reduce the main the declination, Vice declination and increasing the nose radius, can serve to increase tool strength and reduce cutting temperature effect, are conducive to improved cemented carbide tool life.

4. Workpiece material: the higher the strength, hardness and toughness of the work material, cutting enables the cutting temperature,cemented carbide tool life is reduced.

5. The tool material: tool material is an important factor affecting cemented carbide tool life, cemented carbide tool life of the tool material thermal conductivity, the higher the wear resistance of the longer cutting cemented carbide tool life, therefore, is to improve the selection of coated tools and high-performance tool material an effective way.

Effects of Different Tool Materials on Cemented Carbide Tool Life

Cutting alloy steel, the choice of different tool materials: high-speed steel, carbide and ceramic tools on cemented carbide tool life curve.

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