Sheet Metal Process Design

In order to meet the requirements of the function and appearance of the product, the design of the sheet metal should ensure that the stamping process is simple, the stamping die is easy to make, the sheet metal stamping quality is high, and the size is stable. Detailed sheet metal design guidelines can be referred to the "Parts Structure Design Process" and "Product Design Guide for Manufacturing and Assembly" published by the Machinery Industry Press.
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After the drawing is obtained, different blanking methods are selected according to the different development drawings and batches, including laser, CNC punch, cutting plate, mold, etc., and then the corresponding development is made according to the drawing. CNC punching machine is affected by the tool, for some special-shaped workpiece and irregular hole processing, there will be a large burr at the edge, to carry out later deburring treatment, and has a certain impact on the accuracy of the workpiece; Laser processing has no tool limit, smooth section, suitable for the processing of special-shaped workpieces, but it takes a long time to process small workpieces. Placing the table next to the CNC and laser is conducive to placing the sheet material on the machine for processing, reducing the workload of lifting the plate.
Some usable edge material is placed in the designated place to provide material for testing the mold during bending. After the workpiece is blanked, the corners, burrs and contacts should be trimmed (grinding treatment). At the tool contact, the flat file should be trimmed. For the workpiece with large burrs, the grinder should be trimmed, and the small inner hole contact should be trimmed with a corresponding small file to ensure the appearance of the workpiece. The position of the workpiece on the bending machine is consistent when bending to ensure the consistency of the size of the same batch of products.
After the blanking is completed, enter the next process, and different workpieces enter the corresponding process according to the requirements of processing. There are bending, pressing riveting, flanging and tapping, spot welding, convex hull, section difference, sometimes after bending one or two times to press the nut or stud, which has mold convex hull and section difference to consider the first processing, so as to avoid interference after other processes first processing, can not complete the required processing. When there is a hook on the upper cover or the lower shell, it should be processed before bending if it cannot touch welding after bending.
When bending, first of all, according to the size on the drawing, the thickness of the material to determine the bending tool and the slot, to avoid the collision between the product and the tool caused by deformation is the key to the selection of the upper die (in the same product, different models of the upper die may be used), the selection of the lower die according to the thickness of the plate to determine. The second is to determine the order of bending, bending the general law is first inside after outside, first small after large, first special after ordinary. The workpiece with the edge to be crushed is first bent to 30° -40 °, and then the workpiece is crushed with the leveling die.
When pressing riveting, consider the height of the stud to choose the same different mold, and then adjust the pressure of the press to ensure that the stud and the surface of the workpiece are flush, to avoid the stud is not pressed firmly or pressed out more than the workpiece surface, resulting in the workpiece scrap.