Detailed interpretation of sheet metal process acceptance criteria for sheet metal processing
Sheet metal processing production: according to the basic processing method of sheet metal parts, the following materials, bending, stretching, forming, welding. This specification states the technological requirements to be noted in every processing method. According to the different processing methods, the blanking can be divided into general punching, number punching, cutting bed cutting, laser cutting, and wind cutting. Because of the different processing methods, the processing technology of the blanking is also different. The method of sheet metal blanking is mainly punching and laser cutting. When bending material is bent, the outer layer is stretched and the inner layer is compressed.When the thickness of the material is fixed, the smaller the inner R, the more serious the tensile and compression of the material; when the tensile stress of the outer corner is more than the ultimate strength of the material, the crack and fracture will be produced. Therefore, the structure design of the curved part should avoid the small radius of the bending corner. Stretching: the fillet radius between the bottom part of the drawing piece and the straight wall should be greater than the thickness of the plate, that is, R1 equal to t.
In order to make the tensile work more smoothly, generally r1= (3~5) t, the maximum fillet radius should be less than or equal to 8 times the thickness of the plate, that is, R1 is less than 8t. Due to the different stress sizes of the drawing parts, the thickness of the stretched material will change. In general, the bottom center keeps the original thickness, the material at the bottom corner is thinner, the top is closer to the flange and the material becomes thicker, and the rectangular tensile parts are thickened around the round angle. Molding: the reinforcement on the sheet metal parts helps to increase the rigidity of the structure. The blinds are usually used for ventilation and heat dissipation on various shrouds or shells. The molding method is to cut the material by the edge of the punch, while the rest of the punch makes the material stretching and deformation at the same time, forming the undulating shape of the opening. The welding methods are mainly arc welding, electroslag welding, gas welding, plasma arc welding, melting welding, pressure welding and brazing. The welding of sheet metal products is mainly arc welding and gas welding.
Arc welding has many advantages such as flexibility, maneuverability, wide applicability, all position welding, simple equipment, good durability and low maintenance cost. But the labor intensity is large and the quality is not stable. It depends on the operator level. The flame temperature and properties of carbon steel, low alloy steel, stainless steel and copper and aluminum alloy gas welding above 3mm can be adjusted, the arc welding heat source is wider than heat, the heat is less than the arc concentration, the low productivity is applied to the welding of thin wall structure and small parts, and the acceptance mark of the welded steel, cast iron, aluminum and copper sheet metal chassis is used. The results of the quasi inspection and acceptance sites can be consistent in the products delivered to the manufacturer or the products designated by Party A, and the final result will be the final result.
参考：1.箱体底面及其他侧面平面度为1mm。2.箱体前后或左右立面相对底面地垂直度为1mm。3. 面板的顶面和底面平行度为0.5mm，侧面和底面垂直度为0.5mm。4. 面板装入箱体后，应垂直端正，其侧面与箱体底面垂直度为0.5mm，底面和箱体底面的平行度为0.5mm。5.安装电路板或机箱的插框，需用工装模拟电路板或机箱进行装配，工装装入、拔出插箱时应顺畅，装入插箱后，应妥贴稳固，无漂浮、松动现象。硬连接的接插件应对位准确，插入、拔出无异常阻滞。
Reference: 1. the flatness of the bottom and other sides of the box is 1mm. 2. the perpendicularity of the front and rear sides of the box is about 1mm. The parallelism of the top and bottom of the 3. panel is 0.5mm, and the verticality of the side and bottom is 0.5mm. 4. the panel should be upright after loading into the box. The verticality of the side and the bottom of the box is 0.5mm, and the parallelism of the bottom and the bottom of the box is 0.5mm. 5. install the plug of the circuit board or the chassis, need to use the tooling analog circuit board or the chassis for assembly, the tooling loading, pulling out the box should be smooth, loaded into the box, should be appropriate and stable, no floating, loose phenomenon. The rigid connector should be positioned accurately, inserted and pulled out without any abnormal block.
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