直线滚动导轨磨损退化对导轨参数的影响

为了研究直线滚动导轨磨损退化对导轨各参数的影响,考虑了每个滚珠的受力、变形和初始预紧力,推导和计算了与磨损退化有关的刚度退化模型、预紧力退化模型、接触角变化模型、摩擦力和摩擦因数模型、最大蠕滑率和临界载荷模型.直线滚动导轨滚珠与滚道的磨损伴随着直线导轨的刚度和预紧力产生退化.同时,上排和下排的滚珠接触角、临界载荷、摩擦因数、摩擦力、最大蠕滑率等参数也发生变化.以上参数对滚动导轨的性能具有重要意义,但这些参数很难直接通过试验测量得到.以国产某型号滚珠直线导轨为研究对象,对所建立的各模型进行仿真分析.结果表明:直线滚动导轨磨损退化对导轨各参数均有不同程度的影响,通过测量直线滚动导轨轨道的磨损可以有效预测导轨各参数的变化规律.

Influence of Wear Degradation of Linear Ball Guides on Other Parameters

To overcome the problem of these parameters that are difficult to obtain from the test measurement directly, this paper investigated the influence of wear degradation of linear ball guides on other parameters. Considering the sufferance load, the deformation and the initial preload of each ball, the models of stiffness degradation, preload degradation, contact angle, critical load, friction coefficient, friction and maximum creepage directly related to the wear degradation are established, respectively. With the wear degradation of linear ball guides, the stiffness and preload of linear ball guides generate degradation ordinarily. Meanwhile, other parameters of linear ball guides such as contact angle of the ball in upper row and lower row, critical load, friction coefficient, friction and maximum creepage are liable to resonate varieties dramatically. The parameters involved above have an important significance in the performance of linear ball guides. In terms of a certain type of domestic linear ball guide, a series of simulation were analyzed based on the established models. Result shows that the wear degradation of linear ball guides affects other parameters to a different degree. The method of the wear measurement of linear ball guides can effectively predict the change regulation of other parameters.