How to choose tools according to materials in CNC machining?

In CNC machining, choosing tools should be considered according to the workpiece material selection: 

(1) Hardness and wear resistance. The hardness of the tool material must be higher than the hardness of the workpiece material, generally required to be above 60HRC. The higher the hardness of the tool material, the better the wear resistance. 
(2) Strength and toughness. Tool materials should have high strength and toughness to withstand cutting forces, shocks and vibrations, and prevent brittle fracture and chipping of the tool. 
(3) Heat resistance. The tool material has good heat resistance, can withstand high cutting temperatures, and has good oxidation resistance. 
(4) Process performance and economy. The tool material should have good forging performance, heat treatment performance, welding performance, grinding performance, etc., and pursue high performance and price ratio.

The principle of CNC machining to select tools is as follows: Tool materials for CNC machining must be selected based on the workpiece being machined and the nature of the process. The selection of tool materials should be matched with the processing object. The matching of cutting tool materials and machining objects mainly refers to the matching of mechanical properties, physical properties and chemical properties of the two to obtain the longest tool life and maximum cutting processing productivity.
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