Abstract
Recently as high feed rate is adopted for machining under high duty ratio, the thermal expansion of ball screw and the thermal deformation of structure are induced by the generation of heat. For improvement of the thermal deformation of machine tool feed drive, both cooling and pre-load of the ball screw are used. However, cooling effect of ball screw is not provided enough under high duty ratio. The compensation of the thermal deformation is effective. But there is a little example applied to ball screw added pre-load to because behavior of the thermal deformation is complex. In this paper, the thermal deformation is measured at neutral structural point at which thermal expansion of ball screw hardly affects position accuracy. By dividing the thermal deformation of structure from the thermal expansion of ball screw, influences are considered independently. Based on the experimental results, the compensation of the thermal deformation of machine tool feed drive are proposed.
