Design method of assembly accuracy repeatability of heavy duty machine tool

Focus on the problems that heavy duty machine tool lack of fault samples and process information in repetitive assembly, result in the existing assembly process method can't meet the repetitive assembly accuracy. According to characteristics of local machine assembly process, propose its assembly repeatability evaluation indexes. Establish the mapping relation among machine performance, assembly accuracy and structure, and built a hierarchical model of assembly process, obtain the process optimal design scheme of assembly accuracy repeatability. Use the multivariate function differential method, propose a calculation method of heavy machine assembly accuracy, and verify applicability of the method, depend on the machine loads and structure criterions, propose heavy machine assembly accuracy repeatability optimization method, example analysis shows that: the servo effect of repetitive assembly accuracy in new process is obvious, simultaneously stress field magnitude and stability of new technology is better than the original, realize effective control of the machine tool assembly accuracy repeatability.