The defects and rejections caused by the combined action of thrust force and cutting heat impede the wide application of carbon fiber-reinforced plastic (CFRP). To study the cutting temperature of two kinds of tools in the orbital drilling of CFRPs, a cutting force model and a heat transfer model were proposed in this research. The three-dimensional heat transfer equation in polar coordinates was established to predict the temperature inside the workpiece and was solved with the finite difference approach. The cutting edge on the bottom of the tool is the main cause of the thrust force, and due to the accumulation of cutting heat, the processing temperature at the exit is higher. The results show that the predictions of the model coincide with the experimental data and that the model can predict the temperature field inside the workpiece in the process of orbital drilling. The novel orbital drilling and reaming tool can effectively reduce the processing temperature of orbital drilling.

推力和切削热的共同作用造成的缺陷和报废阻碍了碳纤维增强塑料（CFRP）的广泛应用。为了研究CFRPs轨道钻孔中两种刀具的切削温度，本研究提出了切削力模型和传热模型。建立了极坐标下的三维传热方程来预测工件内部的温度，并用有限差分法求解。刀具底部的切削刃是产生推力的主要原因，由于切削热的积累，出口处的加工温度较高。结果表明，模型的预测与实验数据吻合，模型能够预测轨道钻孔过程中工件内部的温度场。新型轨道钻孔扩孔刀具可有效降低轨道钻孔的加工温度。