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切削温度场分析是“S”形试件切削热变形分析的基础。该文基于接触面瞬时相等原理建立了切削区域热量分配模型。结合热源法、热量分配模型和温度实验结果,提出并建立了“S”形试件完整的间歇性切削温度场模型。通过热力耦合仿真实现了“S”形试件切削温度场预测,给出了切削温度载荷和冷却液施加方法,以及强制对流系数计算方法。在Parpas-PM20五轴数控加工中心上设计并搭建了基于热电偶法的“S”形试件加工过程温度场实验平台。切削热有限元仿真与实验研究结果验证了切削温度场分析方法和切削温度场预测结果的准确性。
Cutting temperature field analysis is the basis of the “S” shape specimen cutting thermal deformation analysis. In this paper, the heat distribution model of cutting area is established based on the instantaneous equal contact surface principle. Combined with heat source method, heat distribution model and temperature experiment results, a complete intermittent cutting temperature field model of “S” shape specimen was proposed and established. The temperature field of the “S” shape specimen was predicted by thermodynamic coupling simulation. The cutting temperature load, coolant application method and the calculation method of forced convection coefficient were given. The temperature field experiment platform of “S” shape specimen processing based on thermocouple method was designed and built on Parpas-PM20 five-axis CNC machining center. Finite-element simulation and experimental results show that the method of cutting temperature analysis and the accuracy of the prediction of cutting temperature field are validated.