A Design for Quality Management Information System in Short Delivery Time Processes

Abstract

Recently, by the advance of IT (information technology), the IT control charts have been paid attention and been used in quality management information system, for not only putting quality into products at the production stage but also improving communication between management and manufacturing [1], [2]. Because the high quality, low cost and short delivery time are demand from customer, delivery to the multi-item small-sized production, the reduction of delivery time is emphasized. For those needs, developing the methods and designs of control chart suitable for today's work situations (For example, short delivery time process.) become a new problem for manager, which is also one research theme of control chart practical applications study group of JSQC [3]. The classical definitions of the control chart’s PDCA (Plan, Do, Check and Act) procedures are known. Recently, the evaluation of the economy of this control chart’s PDCA procedures is connected with daily management. By investigating literature cases in the activities of control chart practical applications study group, it is recognized that the act procedure is the most important in the procedures of PDCA of control chart [4]. Because the systematic investigations of control chart's PDCA design was not done in the works before, Sun, Tsubaki and Matsui defined and considered the PDCA designs based on the x control chart [5] and P control chart [6], respectively. In addition, the PDCA design of the x control chart with tardiness penalty is investigated [7]. However, the ACT time was not considered in above researches. In this research, first a design of the x control chart is presented and its mathematical formulations are shown. Then, the presented design based on the judgment rules of JIS Z 9021 [8], [9] is studied, finally, by numerically consideration using the data from real situation, the relations of key parameters and delivery time and the total expectation cost are discussed.