After getting the drawing, choose different blanking methods according to the developed drawing and batch, such as laser cutting, CNC punching, cutting board, molding, etc. CNC punch is impacted by the cutter, for some abnormal shaped workpiece and irregular hole processing, there will be larger burrs on the edge, which need to be removed later, and it may affect the precision of the workpiece; There is no tool limitation for laser cutting, and the section is smooth, so it is suitable for processing abnormal shaped workpiece, but it takes a long time to process small workpiece. It is convenient to machine a sheet metal part when a work bench is placed near the numerical control machine and laser cutting machine as it will reduce the process of plate lifting. Some of the edge material that can be used is placed in the specified place to provide the material for testing the mold when bending.

After blanking, it is necessary to trim edges, burrs and connection points (polishing process). At the cutter connection point, trim with a flat file. For workpiece with larger burrs, finish with grinding machine. For small hole connection point, trim with corresponding file in order to make sure the appearance. At the same time, the outline dressing is also guarantees the locating on the bending machine to ensure consistent dimension for the same batch.

Next process

After blanking, the workpieces are shifted to next procedure according to the processing requirements. There are bending, pressure riveting, flanging tapping, spot welding, embossing,  etc. Sometimes after bending, the nut or stud needs to be presses. For the area that needs to emboss and step, it should be processed first to avoid interfering other processes. If there is a hook on the upper or lower shell, and it cannot be welded after bending, it should be processed before bending.

Bending cutter and cutter groove should be chosen firstly based on the size of the drawing and material thickness to avoid the deformation caused by the crash between product and tool. Secondly, to determine the sequence of bending, the general law of bending process is first inside then outside, first small then large, first special then ordinary.

When pressing rivet, choose the die according to the height of the stud, and then adjust the pressure of the press, to ensure that the stud and the workpiece surface are flush. If the stud does not press firmly or presses over the workpiece surface, it will cause workpiece scrap.

Welding includes argon arc welding, spot welding, carbon dioxide welding, manual arc welding and so on. For spot welding, it should first consider the welding position of the workpiece. It’s better to consider making a fixture for workpiece locating to ensure the spot welding position is accurate in the mass production

After spot welding, there are welding scars on workpiece, which need to be trimmed by a flat mill. Sub-arc welding is mainly used for two large workpieces needing to attach together, or a workpiece with edge needing to be processed, to achieve the smooth workpiece surface. The heat generated during argon arc welding is likely to deform the workpiece. After welding, it should be handled by a grinding machine and a flat grinding machine, especially in the edges and corners.

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