Xu Jinyang, Li Chao, Dang Jiaqiang, El Mansori Mohamed, Ren Fei
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
MSMP-EA 7350, Arts et Métiers ParisTech, Châlons-en-Champagne 51006, France.
Materials (Basel). 2018 Nov 25;11(12):2366. doi: 10.3390/ma11122366.
High-strength carbon fiber reinforced polymer (CFRP) composites have become popular materials to be utilized in the aerospace and automotive industries, due to their unique and superior mechanical properties. An understanding of cutting temperatures is rather important when dealing with high-strength CFRPs, since machining defects are likely to occur because of high temperatures (especially in the semi-closed drilling process). The friction behavior at the flank tool-workpiece interface when drilling CFRPs plays a vital role in the heat generation, which still remains poorly understood. The aim of this paper is to address the friction-induced heat based on two specially-designed tribometers to simulate different sliding velocities, similar to those occurring along the flank tool-work interface in drilling. The elastic recovery effect during the drilling process was considered during the tribo-drilling experiments. The drilling temperatures were calculated by the analytical model and verified by the in-situ experimental results gained using the embedded thermocouples into the drills. The results indicate that the magnitudes of the interfacial friction coefficients between the cemented carbide tool and the CFRP specimen are within the range between 0.135⁻0.168 under the examined conditions. Additionally, the friction caused by the plastic deformation and elastic recovery effects plays a dominant role when the sliding velocity increases. The findings in this paper point out the impact of the friction-induced heat and cutting parameters on the overall drilling temperature.
高强度碳纤维增强聚合物（CFRP）复合材料因其独特且优异的机械性能，已成为航空航天和汽车工业中广泛使用的材料。在加工高强度CFRP时，了解切削温度非常重要，因为高温可能会导致加工缺陷（特别是在半封闭钻孔过程中）。钻孔CFRP时刀具-工件后刀面界面的摩擦行为对热量产生起着至关重要的作用，但目前对此仍知之甚少。本文旨在基于两个专门设计的摩擦计来研究摩擦生热，以模拟不同的滑动速度，类似于钻孔时沿刀具-工件后刀面界面发生的滑动速度。在摩擦钻孔实验中考虑了钻孔过程中的弹性恢复效应。通过解析模型计算钻孔温度，并通过将热电偶嵌入钻头获得的原位实验结果进行验证。结果表明，在研究条件下，硬质合金刀具与CFRP试样之间的界面摩擦系数大小在0.135⁻0.168范围内。此外，当滑动速度增加时，塑性变形和弹性恢复效应引起的摩擦起主导作用。本文的研究结果指出了摩擦生热和切削参数对整体钻孔温度的影响。
