Econmic process control for over-adjusted process

Abstract

Overadjustment to processes may result in shifts in process mean, ultimately affecting the quality of products. An economic model is developed for the joint economic design of individual X and cause-selecting control charts to control both means of the dependent processes. The objective is to determine the design parameters of the proposed control charts that minimize the total quality control cost. A Markov chain approach is proposed to derive the economic- adjustment model. Application of the model is demonstrated through a numerical example.