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为了深入研究基于冗余驱动并联机构的混联机床的静刚度,提出一种建立整机刚度模型的方法,这种方法考虑了滚动直线导轨副和轴承的变形。根据刚度组集原理建立整机刚度矩阵,得到整机静刚度分布情况,并讨论了滚动直线导轨对整机静刚度的影响,针对机床薄弱环节,进行结构优化。结果表明:在一定工作空间内,整机x、y、z方向静刚度具有对称性,z向刚度最好,x向刚度最差。滚动直线导轨副对整机刚度影响较大。通过改进某些部件结构提高了整机x向刚度,为此类机床设计和优化提供了理论分析依据。
In order to study the static stiffness of the hybrid machine tool based on the redundant drive parallel mechanism, a method of establishing the rigidity model of the complete machine is proposed. The method takes the deformation of the rolling linear guide pair and the bearing into consideration. The stiffness matrix of the complete machine is established according to the principle of stiffness set, and the static stiffness distribution of the whole machine is obtained. The influence of rolling linear guide rail on the static stiffness of the complete machine is discussed. Structural weakness is optimized according to the weak link of the machine tool. The results show that the static stiffness in the x, y and z directions of the whole machine is symmetrical in a certain working space, the stiffness in the z direction is the best, and the stiffness in the x direction is the worst. Rolling linear guide pairs of stiffness greater impact on the machine. By improving the structure of some components to improve the machine x-direction stiffness, for the design and optimization of such machines provide a theoretical basis for analysis.