The selection of the cutting volume of the gun drill
The choice of cutting parameters is related to the cutting process and the chip travel. It is also related to the material, precision requirements and machine tool characteristics of the machined parts.
1. cutting speed
Cutting speed is mainly determined by tool material, which is limited by drill durability and machine speed. At present, the cutting speed of high-speed steel gun drill is V 35-70m/min.
The feed rate is mainly limited by the stiffness and strength of the process system (tools, workpieces and machine tools). In addition, it is also affected by the surface quality, chip removal effect and the nature of cutting fluid. At present, the high speed steel gun drill often takes F as 0.01-0.032mm/r, and the bigger diameter takes the upper limit.
The cutting parameters of the gun drill refer to the following table:
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