Cutting processing is roughly divided into turning, milling and cutting (drilling, end mill end cutting, etc.), the cutting heat of these cutting processes on the tip of the cutting edge is also different. Turning is a continuous cutting, the cutting force at the tip of the cutting edge does not change significantly, the cutting heat acts continuously on the cutting edge; milling is a kind of intermittent cutting, the cutting force is intermittent on the tip of the cutting edge, cutting vibration will occur, the tip of the cutting edge is affected by the heat, is alternately heated when cutting and non-cutting cooling, the total heat is less than when turning.
The cutting heat during milling is a kind of intermittent heating phenomenon, and the tool teeth are cooled during non-cutting, which will contribute to the extension of tool life. Japan Institute of Physical and Chemical Research of turning and milling tool life for comparative testing, milling tools used for ball end mill, turning for general turning tools, both in the same processed materials and cutting conditions (due to different cutting methods, depth of cut, feed, cutting speed, etc. can only be roughly the same) and the same environmental conditions for cutting comparison test, the results show that milling processing to extend tool life is more The results show that milling is more beneficial to prolong the tool life.
When cutting with tools such as drills and ball end mills with a central edge (i.e., the part with cutting speed = 0 m/min), the tool life near the central edge is often low, but it is still better than when turning. In cutting difficult to machine materials, the cutting edge is affected by heat, often reducing tool life, cutting method such as milling, the tool life will be relatively long. However, difficult-to-machine materials can not be used from start to finish all milling, there will always be a need for turning or drilling in the middle of the time, therefore, should be for different cutting methods, take the appropriate technical measures to improve processing efficiency.