Flexible Roll Forming Process Online Profile Image Detection And Control

Roll forming is an advanced forming technology. Roll forming is widely used in construction, automotive and other fields according to its merits. But with the rapid development of science and technology, people has put forward higher requirements for roll forming products so the flexible roll forming emerges as the times require. Based on roll forming, flexible roll forming is that rolls are able to move in the direction which is perpendicular to the sheet, so the sheet forming cross section could change along the longitudinal aspect. Compared with roll forming products, flexible roll forming products have stronger bending resistance, larger bearing load and so on. So it could cater the needs of people better.Because of roll forming process of multi-pass characteristics, so the flexible roll forming process needs more servo motor to control the motion of the rolls. In order to obtain high precision flexible roll forming products, tracks of each roll must be strictly consistent, but in flexible roll forming process there are kinds of coupling in shape such as horizontal bending, longitudinal as to the process is tension, longitudinal bending and horizontal shearing, and each servo motor load is different. Therefore, it is difficult to control servo motor.According to the above factors, this paper introduces a method that machine vision bind to the flexible roll forming control system. And based on the machine vision detection precision of sheet forming, this paper proposed a new real-time detection and control method. The detection method for sheet metal forming is image acquisition, image processing and other means for the extraction of sheet metal forming in some time section contour curve. After compare extraction section contour curve with the moment theory section contour curve in the control system, we get the deviation value and feedback to the control system for the interpolation arithmetic, and then control the next servo motor, so that the next rolls motion trajectory is exact matching with the rolls motion trajectory, improve product accuracy and reduce scrap rate.According to the detection control theory, the research completed from selection of hardware to the system organizing work. Combined with the control system in the development of programming language VC++, this paper completed the detection system software development. This method that the program combines to control system could finish the image sampling, image processing, image comparison and feedback difference better.