中文摘要：

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。

英文摘要：

Geometric and physical parameters were analyzed of sticking welding layer on the rake face of ce- mented carbide tool, and then theoretical heat transfer model and finite element model were established for tool rake face with or without sticking welding layer by using Laplace transform, inverse transform and the first law of thermodynamics, and combining the actual working conditions of cutting. The theoretical model solution and finite element model simulation were also carried out. The results show that the existence of sticking welding layer can affect temperature gradient of the tool substrate. The simulated temperature gradient change is verified by the theoretical model, resolving the problem that tool rake face temperature gradient change cannot be verified by experiments. Based on numerical simulation of the internal tempera- ture distribution of the tool with different sticking welding layer thickness and thermal coefficient, the in- fluence rules are obtained of sticking welding layer on temperature distribution in tool rake face. The error is less than 10% of cutting temperature of the tool with sticking welding layer from experiments and nu- merical simulation,verifying the accuracy of the finite element model.