关键词: 混合式多阶段加工, 偏差流, 复杂网络, 关键加工特征, 误差溯源

Abstract: Complex parts production usually requires a hybrid multistage machining process,which has a variety of errors and accumulates in multiple processes.To ensure the quality of complex product,a method for variation propagation modeling and error source identification based on self-regulation weighted variance propagation network was proposed.This method constructed a self-regular weighted variation propagation network,taking into account the actual error and connection relationship in the processing process.And the weighted LeaderRank sorting algorithm was introduced to extract the key processing characteristics which would lead to the server quality problems in the multistage process.Then,the traveling algorithm was proposed to find the error propagation paths.The ContributionIndex was proposed to identify the error source of the key point to determine which stages need to be controlled firstly.Finally,a representative main bearing cover with multistage machining process was studied,which proved that the method could effectively model the complicated process deviation flow and identified the key weak points and the error sources in the process.

Key words: hybrid multistage machining, variation flow, complex networks, key processing characteristics, error source diagnosis