Introduction of intelligent stamping

Sheet metal stamping, from manual operation to semi-mechanized, mechanized, and automated operations, is a sign of the development of stamping to each stage. Now sheet metal stamping has entered the intelligent stage. Therefore, it can be said that intelligent stamping is the development of sheet metal stamping technology. The inevitable trend. The study of sheet metal forming intelligence originated in the United States in the early 1980s. After that, the Japanese plastic processing industry also began to study sheet metal intelligence. In the first ten years of the technical research, all the strength was concentrated on the forming control of the bending springback. It was not until 1990 that the research of this technology was extended to the drawing and deformation of cylindrical parts, and then to the automobile cover parts. Forming, intelligent forming of progressive dies, etc. The so-called intelligent stamping is a comprehensive technology produced by the organic combination of cybernetics, information theory, mathematical logic, optimization theory, computer science and sheet metal forming theory. The intelligentization of sheet metal is a higher stage of new technologies such as the automation of the stamping forming process and the flexible processing system. Its amazing thing is that it can identify the performance parameters of the material online and predict the optimal process parameters based on the characteristics of the object being processed, using easy-to-monitor physical quantities, and automatically complete the stamping of the sheet with the optimal process parameters. This is the typical four elements of intelligent control of sheet metal forming: real-time monitoring, online identification, online prediction, real-time control processing. In a sense, smart stamping is actually a revolution in people's understanding of the essence of stamping. It avoids the endless exploration of the stamping principle in the past, and instead simulates the human brain to deal with the things that actually happen in stamping. It does not proceed from basic principles, but based on facts and data to achieve optimal control of the process. Intelligent control is of course the optimal process parameters, so the determination of optimal process parameters is the key to intelligent control. The so-called optimal process parameters are the most reasonable process parameters that can be adopted under the premise of satisfying various critical conditions. To achieve the online prediction of the optimal process parameters, it is necessary to have a clear understanding of the various critical conditions of the forming process, and to be able to give a quantitative and accurate description, and on this basis can determine the intelligent control. The accuracy of quantitative description determines the recognition accuracy and prediction accuracy of the intelligent system. This shows that the recognition accuracy, prediction accuracy and control accuracy of the system all depend on the improvement of quantitative description accuracy, so it must be continuously modified and improved. In addition, the detection accuracy, recognition accuracy, prediction accuracy and monitoring accuracy system itself must be continuously improved. In this way, intelligent stamping can reach the required level. Relevant studies have shown that in the intelligent control of the deep drawing process, the prediction of the optimal process parameters ultimately comes down to the determination of the change law of the blank holder force, and the control of the blank holder force is based on the study of the prediction of the blank holder force. There are mainly two traditional methods for predicting blank holder force in deep drawing: experimental method and theoretical calculation method. In recent years, artificial neural networks and fuzzy theory and other artificial intelligence theories have been introduced into the prediction research of the optimal blank-holder force control curve. At present, the variable blank-holder force control technology has become a research hotspot in academia and industry. The theoretical basis for the change law of blank holder force is to determine the critical conditions for wrinkling or fracture. It can be seen that the correct determination of the critical conditions for flange wrinkling and fracture during deep drawing must be taken seriously. Further research also shows that for the deep drawing of the tapered part, the flange wrinkle area is almost surrounded by the side wall wrinkle area, so the side wall wrinkle is overcome and the flange wrinkle is overcome, so the cone In terms of part drawing, the main contradiction is that the workpiece is broken and the side wall is wrinkled. Therefore, the range of the blank holder force should be controlled between the side wall without wrinkles (the minimum limit) and the side wall without cracking the maximum limit. Previous post: A brief overview of metal stamping processing