Research On The Ebedded System Of SPC For Machining Operations

Now the competiton of merchandise is the competition of the quality.The mass challenge confronted with by the enterprises is to make high quality product.Therefore, the enterprise requires one kind of the intelligence assistant implement urgently to carry out qaulity control for machining operations, further more, the implement and the quality control method of it for the manufacturing process must adapt to the transition of the morden manufactur condition and the morden manufacture pattern. Under modern fabrication condition, a great quantity of advanced technology and manufacture equipment along with detecting device have been adopted, so high requirement to the quality control for the machining operations has been brought forward; as the chang of market demand the production pattern of most enterprise has transitted to small batch from mass batch, the traditional means of SPC is not suitable for the quality control of small batch. Aiming at these problems, the paper designed a kind embedded system of spc for machining operation ,the hardware and software of it have also been developed, meanwhile the paper proposes a quality control method for the small batch production in the ebedded system, and studys the way of pattern recognition of abnormal control charts in embedded system also.Firstly, the paper analyzes the difficulty of the application of SPC in the small batch production, and discuses a method of SPC in the small batch production. Then the paper studys the means of pattern recognition of abnormal control charts, put forward a method of pattern recognition of abnormal control charts based on BP neual network, and contrives its application method in the ebedded system. Exponentially weighted moving average (EWMA) and fuzzy algorithm for the input samples are also developed to improve its recognition accuracy. Lastly, the paper designes a kind embedded system of SPC for machining operation by micro-process unit S3C2410 with ARM9 kenerl, the system is with high performance and with high speed configured with communication interface of RS232,USB,RJ45,IIC;LCD, keyboard and mouse is also configured to benefit the interaction between humen and computer.The system adopts the Windows CE.NET as its operation system, the quality control software is developed by using embedded visual c++ language, the software is with graphic user interface and it is with the functions of control charts analysis,process capability analysis, real-time diagnosis, automation data acquisition, data storage and management along with the capability of intranet communication, which consist a integral SPC system for machining operation.The result manifests that the system is perfect in function, integral and tight in structure, it is safe, low cost, easy to use and extendable.The system is feasible and steady, it is excellent not only in technology, but in economy also.