Research on multi-stage manufacturing process reliability improvement

The complex interactions between multistage manufacturing processes and different processing technologies is difficult to express with unified mathematical expression. In this paper, the reliability robust design model was studied based on directed topological graph. This model takes the quality characteristic variation loss in the manufacturing process as the objective function, with process sequence as constraints, taking into account the manufacturing process tolerances and inherent reliability of the output products to solve the problem of process procedure optimization and process parameters optimization. Finally, this paper applied a case about servo valve manufacturing process to verify the validity of the proposed method.