空心滚珠丝杠在数控机床伺服进给系统中的应用

针对数控机床主轴和伺服传动系统的热误差阻碍进一步提高机床定位精度的问题,对数控机床伺服进给系统的热变形作了深入研究。结果表明:螺母摩擦和轴承摩擦是滚珠丝杠伺服进给系统的主要热源,其摩擦热量与滚珠丝杠转速及轴向载荷几乎成正比;采用空心丝杠和空心螺母有效抑制了滚珠丝杠在高速进给时的热变形量,减小伺服进给系统的稳态误差。

Application on Hollow Ball Screw in Numerical Control Machine Tool Servo Feed System

Aimed at the problem of the thermal error of numerical control ( NC) machine tool spindle and servo feed system hin-dered the raising of machine tool position precision , the thermal deformation of NC machine tool of servo feed system was researched in depth .The results show that the nut friction and bearing friction are the main heat sources of ball screw servo feed system , and the fric-tion heat is alomost proportional to rotational speed of ball screw and axial loading .Hollow ball screw and hollow nut were adopted , which effectively restraines the thermal deformation quantity when ball screw in high speed feeding , and the steady error of servo feed system is diminished .