Research And Development Of Quality-control Information System For Small Batch Production In The Machining Workshop

The quality control is very important content in quality management. And it is an important means to realize the preventive principle and keep the process in statistical control. In twenties of this century, the American Dr. Shewart W.A. proposed the quality control theory which could give alarms to the process whenever it was abnormal. But it just applicable to the mass production. It performed inability in the producing process of small batch. As the small batch production becomes more and more popular, how to use SPC methods including quality control charts and how to use the classical quality control ways to production of small batch, have important value.The characteristic of small batch production is that there is no enough data, the information of product quality is deficient and it can not use the traditional quality control method. Hence we need to study the quality control in production process of small batch and develop a more effective method, in order to improve the quality control of small batch production.Firstly, this dissertation studied the related basic theories of quality-control information system. Then we discussed the quality control method of small batch production in the history, including small batch quality control chart of F.S. Hillier. Q quality control charts of Quesenberry C.P. and CUSUM,EWMA control charts etc.The small batch production is no enough data and information. In order to decreased the process loss into minimum, this dissertation proposed a two-stage method of quality control for medium and small batch production. In this method, production process was divided into initial production of new products and production of technologies mature,in the two stage quality control by using pre-control chart and X- X -R control chart, then through real-time calculated the capability process indices to determined whether the product of producing process quality in a stable condition.Based on study above, we established quality-control information system for small batch production in the machining workshop which based on J2EE. The method has been used to production quality control in machining workshop of Chongqing Caff automotive bracking and steering system co., Ltd and we had obtained better effects.