In the process of sheet metal processing, usually after the blanking is completed, the next process is entered, and different workpieces enter the corresponding process according to the processing request. There are bending, pressure riveting, flanging and tapping, spot welding, bumping, and step difference. Sometimes the nut or stud should be pressed after bending one or two passes. Among them, the center of the mold is convex and the step difference is to be considered. Processing first, so as not to intervene after other processes are processed first, and the required processing cannot be completed. When there is a hook on the upper cover or the lower shell, if it cannot be welded after bending, it must be processed before bending.
When bending, first of all, according to the size on the drawing, the thickness of the data must be used for the tool and the slot when bending, preventing the product from colliding with the tool and causing deformation is the key to the selection of the upper mold (in the same product, it may be used Different models of upper die), the choice of lower die depends on the thickness of the plate. The second is to confirm the order of bending. The general law of bending is from inside to outside, from small to large, and from special to ordinary. Workpieces with edges to be crushed are first bent to 30°-40°; then the work pieces are pressed to death with a leveling die.