考虑进给系统位姿误差与装配应力的机床导轨几何误差形态匹配设计方法OA

In order to improve the assembly accuracy of precision machine tool guideways,a matching design method for guideway geometric error shapes considering the pose error and assembly stress of the feed system is proposed.Firstly,a mapping model between the geometric errors of the guideways and the pose errors of the worktable was established based on the static equilibrium method.The geometric error shapes of the guideways were analyzed,and the matching experiments on the geometric error shapes were designed.Then,the CRITIC(criteria importance through inter-criteria correlation)weighting method was used to assign weights and evaluate the pose errors of the worktable.The comprehensive scores of the five errors under different combinations of guideway geometric error shapes were obtained,thus obtaining the optimal combinations of three sets of guideway geometric error shapes.On this basis,the stress model of rollers in the guideway slider was established using the Hertz contact theory,and the assembly stress under different combinations of guideway geometric error shapes was analyzed based on the information entropy theory.Finally,the combinations of guideway geometric error shapes that simultaneously met the optimal worktable pose error evaluation results and the most uniform distribution of assembly stress were screened out,and the optimum matching of guideway geometric error shapes considering the pose error and assembly stress of the feed system was obtained.The effectiveness of the proposed method was verified through experiments.The research results have important guiding significance for the precision design and guideway assembly error control of machine tools.