A method for inhibition of product reliability degradation based on manufacturing process quality variation control

摘要

Product reliability is determined by the design stage and qualified in the manufacturing stage. The fluctuations of manufacturing process result in inherent reliability lower than design reliability, called reliability degradation phenomenon. Based on the existing research on manufacturing system reliability and process reliability, this paper analyzes how the manufacturing process quality variation influences product reliability and studies the inhibition of product reliability degradation based on manufacturing process quality variation control. Firstly, the normal and abnormal manufacturing process fluctuations are explained and distinguished. After analyzing traditional process capability analysis, the Bayesian estimation based process capacity index analytical method aiming at the small batch production pattern is proposed and the superiority is verified. Finally, combined with state space model based variation source diagnosis, the framework of manufacturing process product reliability degradation inhibition is put forward.