摩擦生热的仿真分析

利用摩擦热产生塑形变形进行深孔无屑加工，不仅节省材料，而且可以获得高性能的工件。摩擦热深孔成形的热力分析是该工艺技术的一个关键问题。利用LS-DYNA动力有限元分析软件建立圆柱钻头和球形钻头的滑动摩擦副热结构耦合模型，分别计算了模型的温度场以及热应力场。摩擦过程中，最高温度在接触面外侧，温度从外侧向中心逐渐降低，球形钻头由于受力集中，更符合后期钣金深孔冲压成形要求。通过摩擦生热达到一定温度，为进一步研究摩擦热加工深孔工艺奠定了基础。

Simulation Analysis on Friction Heat

Chipless deep hole machining by using plastic deformation created by friction heat not only saves materials, but also has high performance. The thermal analysis of friction heat deep hole forming is one of the key technology problems. Using LS- DYNA software to build coupling model of cyhndrical drill and spherical drill based on dynamic two shding friction pair thermal structure, the temperature field and thermal stress field of the model was derived respectively. The temperature gradually decreases from the outside of contact surface to the center during the friction process, further more the spherical drill meets the requirements of deep hole forming due to the spherical drill centralized force. Friction creates heat and achieves a certain temperature which will provide the foundation for further studying deep hole machining process.