A geometric accuracy analysis and tolerance robust design approach for a vertical machining center based on reliability theory

Abstract This paper proposed a geometric accuracy analysis and tolerance robust design approach for a vertical machining centers based on reliability theory. Based on screw theory, the accuracy prediction model of a vertical machining center is established, which is proved to have good prediction performance. According to the accuracy prediction model, 13 key geometric errors are traced through orthogonal experiments and parametric tests. Taking the key geometric errors as tolerance robust design variable, using its relationship with the manufacturing cost and accuracy reliability, and matching the processing performance requirements, the machine tool cost-geometric tolerance robust design model is established, which is used to realize the tolerance robust design of a vertical machining center. The results show that the method can achieve economical and rational distribution of geometric accuracy in vertical machining center.