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通过对断续切削过程中非稳态温度场和应力场的计算及模拟断续切削热过程的激光冲击试验,得到断续切削的动态温度场和应力曲线,证得:在切出过程中,刀具表层温度不低于内部温度,没有热裂纹和热破损产生.热裂纹是在切入过程中逐渐形成、扩展起来的,从而导致了刀具的热疲劳破损.并通过对裂纹扩展的分析,找出了影响裂纹扩展三个主要因素(温度梯度、循环次数和材料强度)及产生梳状裂纹的原因.
Through the calculation of unsteady temperature field and stress field in intermittent cutting process and the laser impact simulation of intermittent cutting thermal process, the dynamic temperature field and stress curve of intermittent cutting are obtained. It is proved that during the cutting process, Tool surface temperature is not lower than the internal temperature, there is no hot cracks and thermal damage generated hot cracks in the cutting process is gradually formed, expanded, resulting in thermal fatigue damage to the tool. And through the analysis of crack growth, find out The three main factors affecting the crack growth (temperature gradient, number of cycles and material strength) and the reason for the comb-like crack were analyzed.