Development Of The Electric Motor Shaft Manufacturing Quality Detection And Control System

Product quality is a key issue of universal concern in current society and economic construction of all nations. For manufacturing factories, product quality control mainly focuses on control of the manufacturing process, which is called process quality control. At present, the most common method that numerous home manufacturing factories take for process quality control is still manual measurement, which can not meet the demand of the modern quality engineering for its low automation, laggard data analysis processing method, low efficiency and so on.In the dissertation, taking the manufacturing process of the electric motor shaft in WN motor factory as research object and process quality control theory as foundation, and applying auto-measurement technique as well as computer technology, a system of electric motor shaft processing quality detection and control is designed and developed. In this system, the auto-measurement instrument is adopted to get the diameter, which would influence the fit of the shaft and the bearing, moreover the detection data is acquired by computer and Statistic Process Control (SPC) is carried out through computer soft. The major content of this dissertation are as fellows:(1) According to system requirements analysis, gross structure of the system is designed and system development environment is chosen. By analysis of the control object, a fitted control chart is selected as the Statistic Process Control (SPC) tool.(2) A fitted measuring instrument is selected and a measuring installation is designed to bring out auto-measurement. The measuring instrument is connected to computer through the computer serial port.(3) Using Minitab, the Measurement Systems Analysis (MSA) is carried out to make sure that the measuring installation can provide qualified measuring data to meet the SPC demand.(4) The system soft is programmed with Visual Basic (VB) and mainly uses ADO, serial port communication and control chart to accomplish data acquisition, preservation, analysis and process.The system developed in this dissertation not only achieves process quality control automation but also introduces SPC, which will promote the quality control level of the company to some extent.