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机床高速高精度的发展方向,迫切需要提高机床滚珠丝杠的进给速度,然而随着滚珠丝杠进给速度的提高,轴承副摩擦热也在急剧增加,增大了滚珠丝杠的热变形,进而降低了滚珠丝杠的定位精度,为了解决这一问题,文中提出采用通入冷却油的空心滚珠丝杠抑制温升。先对轴承摩擦生热、热边界条件及滚珠丝杠变形进行理论计算,再通过刚度计算得到与给定空心滚珠丝杠等刚度的实心滚珠丝杠外径,运用有限元分析软件分别对空心、实心滚珠丝杠轴承副热特性进行分析,得出通入冷却油的空心滚珠丝杠可以有效地抑制温升和热变形,最后对不同载荷不同转速下实心滚珠丝杠和空心滚珠丝杠的热特性进行分析,为空心滚珠丝杠的设计和研究提供理论依据。
However, with the increase of the feed rate of the ball screw, the frictional heat of the bearing is increasing sharply, which increases the thermal deformation of the ball screw , Thus reducing the ball screw positioning accuracy, in order to solve this problem, the paper proposed the introduction of cooling oil through the hollow ball screw temperature suppression. First, the bearing friction heat, the thermal boundary conditions and the deformation of the ball screw theoretical calculation, and then through the stiffness calculated with a given hollow ball screw stiffness solid ball screw diameter, the use of finite element analysis software, respectively, hollow, The analysis of the sub-thermal characteristics of the solid ball screw bearings shows that the hollow ball screw with cooling oil can effectively suppress the temperature rise and the thermal deformation. Finally, the heat of the solid ball screw and the hollow ball screw under different loads and different speeds Characteristics of the hollow ball screw for the design and research provide a theoretical basis.