The material of the center drill can be divided into high-speed steel, cemented carbide, ceramics and polycrystalline diamond. Among them, high-speed steel is a commonly used material with high cost performance; cemented carbide has good wear resistance and hardness, and is suitable for processing materials with relatively high hardness; ceramic center drill has good high temperature resistance and wear resistance, but processing The efficiency is low; the polycrystalline diamond center drill has ultra-high hardness and wear resistance, and is suitable for processing high-hardness materials. When selecting the center drilling material, it should be selected according to the hardness of the workpiece material and processing conditions. Generally speaking, for harder metal materials, you can choose harder materials, such as cemented carbide, polycrystalline diamond, etc.; for softer materials, you can choose high-speed steel or ceramics. In addition, it is also necessary to pay attention to factors such as the size and surface quality of the center drill to ensure the processing effect and processing accuracy. When using a center drill, attention should be paid to processing lubrication and cooling conditions to avoid tool wear and reduced surface quality due to excessive processing. At the same time, we must also pay attention to the safety during processing to avoid workpiece instability or processing accidents caused by low processing accuracy.