单向C/E复合材料磨削制孔温度场模型的研究

Research on Temperature Field Model during Grinding-drilling of Unidirectional Carbon/epoxy Composites

碳纤维/树脂(Carbon/epoxy,C/E)复合材料制孔过程中,利用'以磨代钻'刀具的制孔质量较高,但由于树脂基体的热力学性能较差,温度场的分布对加工质量具有较大的影响。为研究磨削制孔过程中切削温度场的分布,在对材料热物理特性均匀化处理的基础上,利用有限差分法建立了三维制孔温度场模型,并利用试验对模型进行了试验验证。结果表明,利用所建模型计算所得加工过程中材料的温升情况、制孔出口温度的最大值以及出口温度场的分布均与实际情况具有较高的一致性,所建模型具有较高的精度及可信性。同时,出口温度场的分布呈椭圆形且椭圆的长轴与纤维方向一致。磨削制孔过程中温度场的研究,对确定磨削制孔过程中切削温度对加工缺陷的影响因素具有一定的指导作用,并为C/E复合材料'以磨代钻'制孔新工艺提供了理论依据。

During drilling of carbon/epoxy（C/E） composite,high machine quality can be obtained when adopting ＂grinding-drilling＂ tools.Due to the poor thermo-mechanical properties of epoxy resin,the distribution of temperature field has great effect on the machine quality.In order to investigate the distribution of the temperature field during grinding-drilling of C/E composite,a 3D temperature field model during hole-making is established.Based on the uniform of the thermo-physical characteristics of the material,the model is established by using the finite difference method,and experiment is carried out to verify the model.The simulation results of the temperature raise process in the material,the maximum value of the temperature and the distribution of the temperature field at the exit are consistent with the experiment results.Furthermore,the temperature field is an elliptical zone at the exit and the major axis of the elliptical is the same as the direction of the fiber.The study of the temperature field during grinding-drilling of C/E composite provides some guidance for the influence of cutting temperature on the machine quality and the theoretical basis for the process of the ＂grinding-drilling＂ technology.