1, correct sharpening cutting angle and improve surface roughness:
The bit is similar to the reamer. If there are two main cutting edges and secondary cutting edges, the secondary cutting edge is spiral, with lands and chamfers, which can increase the smoothness of cutting. As long as the cutting angle and surface roughness of the drill are improved and improved with reference to the requirements of the cutting edge. Basically there is a condition similar to a hinged blade.
2, determine the reasonable amount of cutting In the amount of cutting, the impact on the hole accuracy is the depth of cut and the amount of feed, the greater impact on the service life of the bit is the cutting depth and cutting speed. For this purpose, the depth of cut, cutting speed, and feed amount should be controlled separately. Avoid large cuts, reduce heat, avoid shocks and vibrations, eliminate cold work hardening, improve processing quality, and extend bit life. Pre-drilling should prevent the production of more chilled layers, which can increase the drilling load and wear out the fine hole drill.
3. Due to the precision machining of the drilling hole, its accuracy and surface roughness are high, and the cutting load is small. Therefore, the lubrication-based cooling lubricant should be selected.
4, because the drill will wear after multiple uses, and affect the aperture accuracy. The two cutting edges of the drill should be as symmetrical as possible. As a complex tool, the drill bit requires a large degree of durability, and imposes a certain limit on the wear amount of the corner as a blunt standard.

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