“S”形试件间歇性切削温度场建模与分析

Modeling and analysis of intermittent cutting temperature field for the“S”test specimens

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 distributions were analyzed to determine the thermal deformation of ＂S＂testing specimens.The cutting temperature field model was based on the heat distribution ratio for the tool-workpiece contact area.The intermittent cutting temperature model was based on the actual cutting process by combining heat sources,the heat distribution,and temperature measurements.The cutting heat distribution was optimized and the coolant application was simplified to a simple forced convection heat transfer coefficient.These boundary conditions were used in a finite element simulation of the cutting heat in＂S＂test specimens with the results verified against temperature measurements using thermocouples on a Parpas-PM20five-axis computer numerical control（CNC）machine tool.