In traditional machining, tool material, tool structure and tool geometry are the three requirements that determine the cutting performance of the tool, and the tool material plays a key role. The cutting performance of the tool depends on the material, geometry and tool structure that make up the cutting part of the tool. Tool materials have a great impact on tool life, machining efficiency, machining quality and machining costs, so it is important to pay attention to the correct selection and reasonable selection of tool materials. So how do we choose the right tool material?
Different machining applications require different cutting tool materials. The ideal cutting tool materials should have all the following characteristics：
1. Cutting tool materials must be harder than the material which is to be cut, and the tool must be able to withstand the heat generated in the metal-cutting process.
2. The tool must have a specific geometry, with clearance angles designed so that the cutting edge can contact the workpiece without the rest of the tool dragging on the workpiece surface.
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