CFRP/钛合金叠层钻削中的温度场计算研究

Temperature field calculation of CFRP/Ti alloy laminated drilling

针对碳纤维复合材料(CFRP)与钛合金构成的叠层钻削中温度尚未准确预测的问题,以传热学基本原理为指导,建立了叠层钻削温度场模型,对钻削温度进行了理论计算;利用有限元方法,通过确定定解条件、区域离散化等步骤编写了计算机程序,使模型可解;进行了叠层钻削实验,通过预埋的极细热电偶获得了钻削过程中界面处特定点的温度,通过测力仪获得了切削力及扭矩等数据;再将测量数据以及加工参数代入模型中,利用其中一点的温度获得了热量传递到工件的效率,将其代回模型中进行了温度场求解,并将其他点处的测量温度与求解结果进行了对比。研究结果表明:计算得到的温度与测量温度值偏差较小,变化趋势相似,精确度较高,可以用来进行叠层钻削过程的温度场预测。

Aiming at the problems that the temperature prediction in CFRP/Ti lamination drilling process is not accurately predicted,based on the basic principle of heat transfer,a drilling temperature model was established,the drilling temperature was calculated theoretically.Using the finite element method,after determining definite conditions,the discretization of the region and many other steps,a computer program was written to make the model solvable.The laminated drilling experiment was carried out,in which the temperature at specific points at the interface was obtained through embedded thermocouples,and the cutting force and torque were obtained through the dynamometer.The measured values and processing parameters were substituted into the model,and the heat transfer efficiency was obtained by using the temperature at one point.Then,the efficiency was substituted back into the model and the solution result was compared with the temperature of other points measured in the experiment.The results indicate that the calculated temperature has a small deviation from the measured temperature value,the change trend is similar,and the accuracy is high.The model can be used to predict the temperature field of laminate drilling process.