Abstract
In this paper we describe a newly developed cutting force measuring device with high response speed and fine resolution. It can monitor cutting process as well as tool wear during high-speed endmilling of hard steel materials. The device enables precise determination of an transient cutting force which is generated by each cutting edge of an endmill tool rotated at a speed of 20000 rpm. It is found that the cutting force and its waveform in high-speed milling are affected markedly by the cutting parameters and tool wear. The cutting force proportionally increases with increasing cutting speed. When the cutting speed exceeds a certain speed, the cutting edges rapidly wear out, also the increasing rate of cutting force changes quickly.
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