【摘要】 静刚度是机床设计的重要指标之一。为了解基于平面三自由度并联机构的龙门式混联机床的静刚度性能,提出了一种分析方法,此方法同时考虑了并联支链和铰链的变形。根据微分误差模型,建立了机床刚度矩阵,得出了机床位置刚度和转动刚度的分布情况,着重讨论了铰链刚度对机床刚度的影响。结果表明:在工作空间内沿Y方向位置刚度具有对称性,转动刚度具有不对称性;铰链刚度对机床刚度影响很大,在并联机床或者混联机床设计中必须选用刚度好的铰链连接形式。更多还原

【Abstract】 Stiffness is one of the most important criteria in machine tool design. The stiffness of a gantry machine tool based on a 3-DOF planar parallel mechanism was analyzed by considering the deformation of the parallel links and the joints. The differential error model was used to develop the machine tool stiffness matrix. The solution gave contour plots of the position stiffness and the rotation stiffness. The simulation shows that the joint stiffness has an important effect on the machine tool stiffness; therefore, high stiffness joints should be used in parallel or hybrid machine tools. The results also show that the position stiffness is symmetric along the Y direction and the rotation stiffness is asymmetric in the machine tool working space.更多还原