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Q4: What are the process processes of sheet metal processing?

Q4: What are the process processes of sheet metal processing?

2018-08-16

A:Workpiece blanking
After the drawing to hand, according to the expansion map and the different selection of different batch mode, there are laser, CNC punch press, shear plate, mold and so on, and then according to the drawings to make the corresponding expansion. The numerical control punch press is affected by the cutting tool. For the machining of some special-shaped workpiece and irregular hole, there will be larger burr on the edge. It is necessary to process the post deburring and have a certain influence on the accuracy of the workpiece; the laser processing has no cutting tool restriction, smooth section and suitable for the machining of the special-shaped workpiece, but for the small work It takes a long time to process parts. Placing the worktable beside the CNC and laser is favorable for processing the sheet metal on the machine and reducing the workload of the lifting plate. Some available edges are placed in designated areas to provide materials for trial bending.
After the blanking of the workpiece, the corner, burr and joint should be trimmed (grinding treatment). At the joint of the cutter, a flat file is used to repair the workpiece. The grinding machine for the larger burrs is trimmed with a grinding machine, and the small inner hole joint is trimmed with the corresponding small file to ensure the appearance of the exterior, and the shape is also trimmed. When bending, the position is ensured, so that the workpiece can be placed on the bending machine on the same position when bending, so as to ensure the same size of the same product.
Next process
After the blanking is completed, it enters the next process, and different parts enter the corresponding process according to the requirements of processing. There are bending, pressure riveting, flanging tapping, spot welding, punch, segment difference, and sometimes the nut or stud should be pressed well after the one or two bend. In the place where the mold hit the convex hull and the section difference, it is necessary to consider the first processing, so as to avoid the interference before the other process is first processed, and the required processing can not be completed. If there is a hook on the upper or lower shell, if it can not be welded after bending, it should be processed before bending.
At the time of bending, it is necessary to determine the cutters and slots used according to the size of the drawings and the thickness of the material. To avoid the deformation caused by collision between the products and the cutting tools is the key to the selection of the upper die (in the same product, the different models may be used). The selection of the lower die is determined according to the thickness of the plate. The second is to determine the order of bending. The general rule of bending is first inside and outside, first after small, then big, first after special and then common. First, the workpiece is bent to 30 degrees - 40 degrees, and then dies with a flat die.
When pressing riveting, we should consider the height of the stud to choose the same different mold, and then adjust the pressure of the press to ensure the flat surface of the stud and the workpiece, and avoid the screw column not pressing or pressing out the workpiece surface, causing the work piece to be scrapped.
There are argon arc welding, spot welding, carbon dioxide protection welding, manual arc welding and so on. First, spot welding should consider the position of the workpiece welding. In batch production, the location of positioning tooling to ensure spot welding position is accurate.
In order to soldering firmly, punch a bump on the workpiece to be welded to make the bump contact evenly with the plate before the electric welding to ensure the consistency of the heating of each point. At the same time, the welding position can be determined. The same, the welding should be carried out, the preloading time, the pressure holding time, the maintenance time, the rest time, the workpiece can be guaranteed. It is strong with spot welding.
After spot welding, there will be a welding scar on the surface of the workpiece, which should be treated with a flat mill. The sub arc welding is mainly used for two large parts. It is also connected together, or the edge angle of a workpiece is treated to achieve the smooth and smooth surface of the workpiece. The heat generated during argon arc welding is easy to deform the workpiece. After welding, it needs to be treated with a grinding machine and a grinding mill, especially on the sides. surface treatment
After the process of bending and pressing riveting, the surface treatment should be carried out. The surface treatment of different plates is different. After the cold plate is processed, the surface electroplating is generally carried out. After the plating is finished, the spraying process is not carried out, and the phosphating treatment is adopted. After the phosphating treatment, the spraying treatment should be carried out. Plating plate surface cleaning, degreasing, and then spraying. Stainless steel plate (with mirror panel, fog panel, wire drawing board) can be drawn before bending, without spraying, such as spraying to make hair treatment; aluminum plate generally uses oxidation treatment, according to different colors to choose different oxidizing colors.
Commonly used are black and natural oxidation; aluminum plates need to be sprayed after chromate oxidation treatment. Surface pretreatment can make the surface clean, significantly improve the adhesion of the coating, and increase the corrosion resistance of the coating. Cleaning process first cleaning the workpiece, first to hang the workpiece on the pipeline, first through the cleaning solution (alloy deoiling powder), and then into the clean water, then through the spray zone, then through the drying area, and finally the workpiece from the pipeline. Spraying treatment
After surface pretreatment, it enters the spraying process. When the workpiece is required to be assembled and sprayed, the tooth or part of the conductive hole needs to be protected. Protection processing
The tooth hole can be checked into the soft glue stick or screw into the screw. It needs the high temperature tape to attach the conductive protection to the position protection, so that the spraying will not be sprayed to the workpiece, and the nut (flanging) hole can be protected by screw on the outer surface of the workpiece so as to avoid the need of the nut (flanging) hole after spraying. Back to the teeth.
Some large pieces of work are also used for tooling protection. When the workpiece is not assembled, the area where the spray is not needed to be sprayed is protected by high temperature adhesive tape and paper pieces, and some nuts which are exposed outside are protected by screws or high temperature resistant rubber. If the workpiece is sprayed on both sides, the nut (Luo Zhu) hole is protected by the same method; the small workpiece is sprayed with the lead wire or the pin and so on. Some of the workpiece surface is required to be high, and the ash scraping should be carried out before spraying; some work pieces are protected by the special high temperature sticker at the grounding character.
When spraying, the workpiece is first hung on the production line, and the dust on the surface is blown off by the trachea. Spray into the sprayed area, spray into the drying area along the pipeline, and finally remove the spray painted parts from the assembly line. There are two kinds of manual spraying and automatic spraying, so the tooling used is different. Assembly process
After spraying, enter the assembly process, before assembly, we should tear off the protective sticker used in the original spraying, make sure that the thread holes in the parts are not sprinkled into the paint or powder. In the whole process, the gloves should be worn to avoid the dust attached to the workpiece on the hand, and some of the pieces should be blown dry with the air gun. Packing link
After the assembly is assembled, it enters the packing link, and the workpiece is checked into the special packing bag after inspection, and some parts without special packaging are packed with bubble film. Before packing, the bubble film can be cut into the size of the workpiece that can be packed, so as to avoid cutting on one side and affecting the processing speed; large quantity can be made for special cartons or bubble bags, pads, pallets and wooden cases. After packing, put them into cartons, and then attach the corresponding finished or semi-finished labels on the cartons.

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