Abstract:In order to improve the production efficiency, it is necessary to analyze the factors that affect quality of the press fitting, get the curve rule of press fitting to check the quality of the press fit parts. Three parts checking stages of quality were proposed through the data curve model, to check the quality of press fitting. A PLC quality control system was designed to control press fitting. The system could be used to judge the press fitting quality by collecting the data of the press fit process and extracting the key values of the data, give the judging result of the product press fit quality, and input it into the industrial computer system for traceability.The application effect of the system in an automobile parts factory is good, the production efficiency of press fitting is increased by 20%, and the rate of good products is more than 99%.