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Cause of Brittle Tool Exit Failure in Intermittent Cutting

TAO Fu-chun, YUN Zhi-xin, LIANG Ting-zhu, GUO Jun-shan, LI Bin-fang(1.Industrial Technical College of Harbin Univ. Sci. Tech., Harbin 150076 China;2. Harbin Shoe Manufacturer, Harbin 150026 China; 3.Technical Department ofQiqihar Forestry Machinery Factor  
Forming mechanism of negative shear is analyzed, and an expression of cuttingforce during negative shear is given. According to stress analysis of tool wedge zone, the followingconclusion is drawn: the negative shear makes the direction of cutting force deflect so that stressfield of tool get worse which results in tool failure. The causes of thermal cracks and crack exten-sion are analyzed by means of elastic-plastic mechanics, and effective measures preventing thetool from exit failure are presented.
【CateGory Index】: TG711
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