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针对正交干切削加工过程,建立了刀具与切屑接触区域温度场数学物理模型。模型采用绝热半无限介质热源叠加的方法,计算出切屑剪切变形区和“刀具-切屑”摩擦区叠加影响下刀具与切屑在接触区的温度场,分析了最高温度产生位置及其机理。基于该模型,对锋利PCBN刀具硬车削轴承钢过程的温度场进行预测,得到的刀具与切屑接触面温度在多个切削速度条件下误差均小于8%,说明该模型能够实现对锋利切削加工温度场的精确预测。
For the orthogonal dry cutting process, the mathematical model of the temperature field in the contact area between the tool and the chip is established. The temperature field of the tool and chip in the contact zone under the superposition of the chip shear deformation zone and the “cutting tool-chip” friction zone is calculated by the superposition of adiabatic semi-infinite medium heat source. The location and mechanism of the maximum temperature are analyzed . Based on this model, the temperature field of the hard turning bearing steel with sharp PCBN tool was predicted. The error of the temperature of the interface between the cutting tool and the chip was less than 8% under multiple cutting speed conditions, which showed that the model could realize the sharp cutting processing temperature Accurate prediction of the field.