摘要
为了研究滚珠丝杠副滚珠循环系统冲击滑动作用下由于热-机耦合效应产生的微区特性变化,根据赫兹接触理论和经典碰撞理论,文章建立了冲击滑动耦合作用下的接触模型。在此基础上计算了滚珠的入口速度、碰撞力大小、接触时间等。结果表明:冲击滑动接触主要表现为反复的热冲击和剪切表面化,并伴随冲击和滑动加剧,热-机耦合作用下,热影响区很薄。热效应增加了沿深度方向分布的等效应力梯度,且最大等效应力更接近接触表层。
To research the distribution of temperature and stress, caused by thermal-stress effect under im-pact-sliding motion, contact model was established based on Hertz contact theory and the classical colli- sion theory. Based on the dynamic model, the effects of the impact force and the contact time are ana-lyzed. The results show that impact-sliding contact causes transient heating and surfacial-tendency of shear stress. The gradient of temperature and surfacial-tendency of shear stress become intensively with the in-creasing of impact and sliding. The thermal influence area is thin. The thermal effects increase the gradi-ent of mises distribution along depth direction, and the maximum mises stress is closer to contact surface.
出处
《组合机床与自动化加工技术》
北大核心
2013年第4期44-47,共4页
Modular Machine Tool & Automatic Manufacturing Technique
关键词
碰撞接触
滚珠丝杠
热机耦合
动力学仿真
contact impact
11 screw
ermal-stress effect
namic simulation
