Modeling of Machining Error Propagation Network for Multistage Machining Processes

Abstract

Due to the complicated interactions among different stages in multistage machining processes (MMPs), it is important and necessary to explore the inherent mechanism of machining error propagation for improving product quality. As for this issue, a machining error propagation network (MEPN) of MMPs is proposed in this paper, in which machining form feature (MFF) of workpeice, machine tool, fixture and cutting tool (That is machining element, ME) are defined as different network nodes. The associated relationship among different nodes is mapped by graph theory, according to the results of CAPP of workpiece. Based on this, complex networks theory is introduced to analyze the characteristics of the established MEPN, and several measuring indices of error propagation at different nodes are proposed to quantify the interactions among different nodes. At last, a box part of missile launcher is used to illustrate the proposed method.KeywordsMultistage machining processes (MMPs)machining error propagation network (MEPN)complex networksmachining form featuresynthesized propagation index (SPI)