After the drawings are obtained, different blanking methods are selected according to the expansion drawing and batch size, including laser, CNC punch, shearing, mold, etc., and then the corresponding expansion is made according to the drawings. CNC punching machines are affected by cutting tools. For the processing of some special-shaped workpieces and irregular holes, large burrs will appear on the edges, which require later deburring and have a certain impact on the accuracy of the workpiece; laser processing does not require cutting tools. It has a flat cross section and is suitable for processing special-shaped workpieces, but it takes a long time to process small workpieces. Placing a workbench next to the CNC and laser facilitates placing the sheet on the machine for processing and reduces the workload of lifting the sheet. Some available edge materials are placed in designated places to provide material for trial molding during bending. After the workpiece is blanked, the corners, burrs, and joints must be trimmed (grinded) as necessary. Use a flat file to trim the tool joints. Use a grinder to trim workpieces with larger burrs. Small inner hole joints Use the corresponding small file to trim to ensure a beautiful appearance. At the same time, the trimming of the appearance also ensures the positioning during bending, so that the workpiece will be in the same position on the bending machine during bending, ensuring consistent dimensions of the same batch of products. After the blanking is completed, the next process is entered. Different workpieces enter the corresponding processes according to the processing requirements. There are bending, riveting, flanging and tapping, spot welding, convex bulging, and step differences. Sometimes the nuts or studs must be pressed after one or two bends. Among them, the convex bulges and step differences of the mold need to be considered. Process first to avoid interference from other processes after processing first, and the required processing cannot be completed. When there is a hook on the upper cover or lower shell, if it cannot be butt welded after bending, it must be processed before bending. When bending, you must first determine the tool and slot used for bending based on the dimensions and material thickness on the drawing. Avoiding deformation caused by collision between the product and the tool is the key to selecting the upper mold (in the same product, you may use Different types of upper molds), the selection of lower molds is determined according to the thickness of the plate. The second step is to determine the order of bending. The general rule of bending is from inside to outside, from small to large, from special to ordinary. For workpieces with edges that need to be pressed, first bend the workpiece to 30°-40°, and then use a flattening die to press the workpiece to death. When riveting, consider the height of the stud and select different molds of the same type, and then adjust the pressure of the press to ensure that the surface of the stud and the workpiece are flush, to avoid that the stud is not pressed firmly or is pressed out beyond the surface of the workpiece, causing the workpiece to be damaged. scrapped. Welding includes argon arc welding, spot welding, carbon dioxide shielded welding, manual arc welding, etc. For spot welding, we must first consider the position of the workpiece to be welded. During mass production, consider positioning tooling to ensure the spot welding position is accurate. In order to make the welding firm, bumps are made on the workpiece to be welded, so that the bumps can be evenly contacted with the flat plate before power welding to ensure consistent heating of each point, and the welding position can also be determined. Similarly, to weld, it is necessary to Adjust the preload time, holding time, maintenance time, and rest time to ensure that the workpiece can be spot welded firmly. After spot welding, weld scars will appear on the surface of the workpiece, which must be processed with a flat grinder. Sub-arc welding is mainly used when two workpieces are large and need to be connected together, or when the corners of a workpiece are processed to achieve a smooth surface of the workpiece. ,smooth. The heat generated during sub-arc welding can easily deform the workpiece. After welding, it must be processed with a grinder and a flat grinder, especially at the edges and corners. The workpiece must be surface treated after bending, riveting and other processes are completed. The surface treatment methods of different plates are different. Surface electroplating is generally performed after cold plate processing. After electroplating, no spraying treatment is performed. Phosphating treatment is used. After chemical treatment, spraying treatment is required. The surface of electroplated plates is cleaned, degreased, and then sprayed. Stainless steel plates (mirror panels, matte panels, brushed panels) can be drawn before bending, without spraying. If spraying is required, roughening is required; aluminum plates generally use oxidation treatment, and different colors can be selected according to different spraying colors. The commonly used oxidation background colors are black and natural oxidation; if the aluminum plate needs to be sprayed, it should be chromate oxidized and then sprayed. Surface pretreatment can clean the surface, significantly improve the adhesion of the coating film, and double the corrosion resistance of the coating film. The cleaning process first cleans the workpiece, first hangs the workpiece on the assembly line, first passes through the cleaning solution (alloy oil removal powder), then enters the clean water, then passes through the spray area, then passes through the drying area, and finally the workpiece is removed from the assembly line Remove. After surface pre-treatment, enter the spraying process. When the workpiece is required to be assembled and sprayed, the teeth or part of the conductive holes need to be protected. The holes can be checked with soft glue sticks or screws screwed in. Those that need conductive protection must be pasted with high-temperature tape. , make positioning fixtures in large quantities for positioning and protection, so that the inside of the workpiece will not be sprayed during spraying. Use screws to protect the nut (flange) holes that can be seen on the outer surface of the workpiece to prevent the nut (flange) holes of the workpiece after spraying. Everywhere needs to be restored. Some large-volume workpieces are also protected by tooling; when the workpiece is not assembled for spraying, the areas that do not need to be sprayed are blocked with high-temperature-resistant tape and paper, and some exposed nut (stud) holes are protected with screws or high-temperature-resistant rubber. For example, if the workpiece is sprayed on both sides, use the same method to protect the nut (stud) hole; small workpieces are twisted together with lead wires or paper clips and other items before spraying; some workpieces have high surface requirements and must be scraped before spraying; some workpieces are grounded The talisman is protected with a special high-temperature resistant sticker. When spraying, first hang the workpiece on the assembly line, and use an air pipe to blow off the dust on the surface. Enter the spraying area to spray. After spraying, follow the assembly line into the drying area, and finally remove the sprayed workpiece from the assembly line. There are two types of spraying: manual spraying and automatic spraying, so the tooling used is different.

After spraying, enter the assembly process. Before assembly, remove the protective sticker used in the original spraying and make sure that no paint or powder has been sprinkled into the internal threaded holes of the parts. During the entire process, wear gloves to avoid dust on your hands. On the workpiece, some workpieces need to be blown clean. After assembly, the packaging process begins. After inspection, the workpieces are put into special packaging bags for protection. Some workpieces that do not have special packaging are packaged with bubble wrap. Before packaging, the bubble wrap is cut into a size that can package the workpieces. In order to avoid packaging and cutting at the same time, which will affect the processing speed; for large batches, special cartons or bubble bags, rubber pads, pallets, wooden boxes, etc. can be customized. After packaging, put it into a carton, and then put the corresponding finished product or semi-finished product label on the carton. In addition to strict requirements in the production process, the quality of sheet metal parts also requires quality inspection independent of production. First, strictly control the dimensions according to the drawings. Second, strictly control the appearance quality. Those that do not meet the dimensions will be repaired or scrapped. If the appearance is not good, Scratches are allowed, and the color difference, corrosion resistance, adhesion, etc. after spraying can be inspected. In this way, you can find expansion diagram errors, bad habits in the manufacturing process, errors in the manufacturing process, such as punch programming errors, mold errors, etc.

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