Residuals based process capability indices for two-stage processes

Journal of Industrial Engineering International

دوره 13، شماره 2، شهریور 2017   

نویسندگان

Erfaneh Nikzad¹؛ Amirhossein Amiri^{* 1}؛ Babak Abbasi²

¹Department of Industrial Engineering, Faculty of Engineering, Shahed University, Tehran, Iran

²School of Business IT and Logistics, RMIT University, Melbourne, Australia

چکیده

The manufacturing operations often involve multistage processes where the process capability of each stage is affected by the process capability of its precedent processes. This property is known as the cascade property. The purpose of this paper is to estimate the process capability of the second stage of two-stage process while the cascade property impact is removed using residuals analysis. To this end, a method is proposed to determine the specification limits of the residuals based on the specification limits of the quality characteristics in the first and second stages. The C p, C pk and S pk indices are used to calculate the capability of the second stage in the two-stage process. The results of simulation study show the satisfactory performance of the proposed method in estimating the pure process capability of the second stage.

کلیدواژه‌ها

Process capability index . Residuals . Two؛ stage process . Cascade property