Key Technologies For CNC System Of Press Brake Based On N455Controller

Press brake is a processing equipment of bending the sheet metal, and mainly for various cabinets, boxes and other sheet metal parts. At present, the technology of domestic manufacturing for Press brake is at a high level, but most of their carrying systems are from abroad. Some institutions have studied on the Press brake and developed some great CNC systems to replace foreign systems. Compared with foreign technology, there is still a long way to go. So it is necessary to research on CNC system of Press brake for its theoretical and practical significance.Based on the division of assignments, the details are showed as follows:1. By studying the thinking of scene graph and tree structure, each module of Press brake was abstracted. Combined with VS2005, OpenGL ES and other platforms(STL, SQL and XML), a visual and human-computer interactional2D/3D CNC system for Press brake was developed. The system had other characteristics including friendly interface, easy operation and smoothly running.2. To ensure the precision and speed of bending, the bending process parameters, such as bending force, backgauge position and bending depth were all analyzed in detail. The relevant theories and methods were also discussed.3. For completion of the sheet metal bending, the key techniques (sequence search of sheet metal bending) of CNC Press brake were analyzed and researched. The relevant conditions and principles of interference calculation were also studied. Combined with optimizing backgauge position, bending precision recognition, production time calculation and degradation model concept, the feasible, optimum bending sequence for complex sheet metal products including air bend, bumping bend and hem bend was retrieved. For convenient and efficient processing, the CNC system of Press brake also provided an operation to auto search bending sequence by full array (N<5) and genetic algorithm.4. By combining with field experiments, relevant theories and methods, the precision measurements including geometric accuracy of Press brake, motion accuracy of Press brake and forming accuracy of sheet metal were all analyzed.