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通过分析硬质合金刀具前刀面粘焊变质层几何参数和物理参数,采用拉普拉斯变换、逆变换以及热力学第一定律,并结合切削的实际工况,建立了刀具前刀面有无粘焊变质层的传热理论模型和有限元模型,并进行理论模型解算与有限元模型模拟仿真。结果表明,粘焊变质层的存在会影响刀具基体温度梯度变化,且仿真温度梯度变化通过理论模型得到了验证,解决了实验无法验证刀具前刀面温度梯度变化的问题。选用不同粘焊变质层厚度以及导热系数变化进行刀具内部温度分布数值模拟,获得了粘焊变质层对刀具前刀面温度分布的影响规律,并通过实验测量确定有粘焊变质层的切削温度与数值模拟值误差在10%之内,验证了有限元模型的准确性。
By analyzing the geometrical parameters and physical parameters of the visco-weld metamorphic layer of the carbide cutting tool, the Laplace transformation, the inverse transformation and the first law of thermodynamics are adopted. Combined with the actual working conditions of the cutting, the existence of the rake face Visco-welding the heat transfer theory model and finite element model of the metamorphic layer, and theoretical model solution and finite element model simulation. The results show that the existence of viscous welding degenerative layer will affect the temperature gradient of the tool base, and the simulation temperature gradient is verified by the theoretical model, which solves the problem that the temperature gradient of the rake face can not be verified experimentally. The thickness variation of the viscous welds and the change of thermal conductivity were used to simulate the temperature distribution inside the tool. The influence of the visco-weld metamorphic layer on the temperature distribution of the tool rake face was obtained. The cutting temperature, The numerical simulation error is within 10%, which verifies the accuracy of the finite element model.