Process schemas stability analysis of complex parts based on weighted network

Aiming at the production stability of complex parts, a stability analysis method for process schemas of complex parts was proposed based on weighted network. The weighted network of complex parts' productive process was constructed by using the concept of machining cell. Through building the decision-making model of multi-process schema, the production cost and manufacturing time were transformed to the weights of network to do the decision-making. Based on the brittleness theory of complex system, the brittleness risk entropy of each machining cell in weighted network was constructed by analyzing the probability of brittle events that might lead to the collapse of weighted network in machining cells. The vulnerability indicator of weighted network node was analyzed, and the brittleness risk entropy could predict the easily failed subsystem in the entire network. Meanwhile, the brittle event that led to the machining cell failure was retrospected for the greater stability of process schemas. The correctness and effectiveness of the proposed method was verified by using the manufacturing process of an aero engine blade.