【摘要】 伴随着激光快速成型技术的快速发展,在精密加工过程中,研究进给系统的热特性能够确保加工产品的表面质量。文章以激光熔覆进给系统的滚珠丝杠为研究对象,在ANSYS中使用的移动热源模拟实际过程中的摩擦热,结合外界环境的温升过程,激光热源和空气对流的影响,对滚珠丝杠做了间接热—结构耦合分析,得出了在不同时刻下的温度场分布和热变形。结果表明滚珠丝杠在加工过程中所受温度和应力做相似的变化,即滚珠丝杠的温度和应力变化都呈现出波浪式上升的规律。更多还原

【Abstract】 The laser rapid prototyping develops rapidly,The study of feed system dynamic behavior contributes greatly to improve the surface quality of processed in the process of precision machining. In this paper,the ball screwof laser cladding feed system as the research object The friction heat in real process was simulated by a moved heat resource accompanied with the system in the software of ANSYS,and temperature rise of the external environment was taken into consideration. Within the influence of heat source and air convection mentioned above,the thermal-structural coupling analysis was did for the guide rail,and acquired the temperature field distribution and thermal deformation in different time. The result shows that the ball screwdo similar changes in the machining process about the temperature and stress,the lawof the change is that the change of the temperature and stress present wave-like increasing tendency.更多还原