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基于不等分剪切区模型,提出了一个直角切削的热力建模方法.在剪切区,用Johnson-Cook方程表示材料的本构关系,并建立了切屑通过剪切区的速度、应变、应力和温度的控制方程.在刀具/切屑面上,引入依赖切屑速度的摩擦经验公式.通过数值迭代方法计算出流动应力,并考虑了加工硬化和热软化对流动应力的影响.最后预测了各种不同加工条件下的切削力,并与已有文献的直角切削实验数据做比较,发现结果基本一致.提出的模型不需额外的测试,仅需要材料属性和切削条件就能预测出直角切削的切削力.
Based on the unequal shear zone model, a thermal modeling method of rectangular cutting was proposed. In the shear zone, Johnson-Cook equation was used to represent the constitutive relationship of the material, and the velocity, strain, Stress and temperature control equations, the empirical formula of friction dependent on chip velocity is introduced on the tool / chip surface, the flow stress is calculated by numerical iteration method, and the effect of work-hardening and thermal softening on the flow stress is considered. Finally, Cutting force under different processing conditions, and compared with the experimental data of the existing literature, and found that the results are basically the same. The proposed model without additional testing, only the material properties and cutting conditions can predict the right angle cutting Cutting force.