高速滚珠丝杠副气液二元冷却系统设计与仿真

摘要

针对高速滚珠丝杠进给系统由于摩擦发热而导致丝杠产生热变形误差的问题,提出一种高速滚珠丝杠副整体循环冷却和重点发热区域局部冷却的气液二元冷却方法,用于抑制机床因高速运转产生热变形而导致传动刚度和加工精度的变化.通过对不同冷却方式下滚珠丝杠副温度场的变化,以及不同冷却速度情况下滚珠丝杠热变形的仿真分析,验证了气液二元冷却系统的可行性.%Aimed at thermal deformation errors caused by friction in hollow high — speed ball screw feeding system, a new gas—liquid binary cooling method for the high — speed ball screw units was proposed by adopting total circulating cooling and local cooling on key heating area, which can restrain the drive stiffness and machining accuracy changes caused by thermal deformation in the highspeed running. Through simulation method, the changes of temperature field in ball screw units under different cooling methods and the thermal deformation in ball screw under different cooling speed were analyzed. It is proved that the gas—liquid binary cooling system for high —speed ball screw units is feasible.