What does sheet metal processing need to pay attention to?
1. Board blanking
Because of the influence of cutting tools, the CNC punch can produce bigger burr on the edge of some irregular parts and holes, so it is necessary to deburr at later stage, and it also has some influence on the precision of the parts.
Schematic drawing of blanking burr section
Laser processing without tool limit, flat cross-section, suitable for the processing of irregular parts, but for small parts processing time is longer. The worktable is placed next to the numerical control and the laser, which is advantageous to the plate material is placed on the machine to carry on the processing, reduces the lifting plate work load.
Some of the available trim is placed in a designated area to provide material for the test die when bending.
2. Be Familiar with the drawing
Sheet metal processing according to the drawings, according to the development of drawings and batch selection of different blanking methods, including laser, CNC punch, cutting plate, mold and other ways, and then according to the drawings to make the corresponding development.
3. Bend
When bending should first be based on the drawing size, material thickness to determine the bending tool and knife groove, the key to select the upper die is to avoid the deformation caused by the collision between the product and the cutter (different upper dies may be used in the same product) .
The second is to determine the sequence of bending, bending the general rule is first inside and then outside, first small and then big, first special and then common. A workpiece with a crushing edge is first bent to 30 ° 40 and then crushed to death with a flattening die.
4. Polish
After the workpiece is finished, the corners, burrs and contacts shall be trimmed as necessary (sanding treatment) , and the tool joints shall be trimmed with a flat file, and the workpiece with larger burrs shall be trimmed with a sander, the connection of the small inner hole is trimmed with the corresponding small file to ensure the beauty of appearance, and the trimming of the shape also guarantees the positioning when bending, so that when bending, the workpiece leans against the bending machine at the same position, ensure the same batch of products are the same size.
After the blanking is completed, the next working procedure is carried out, and different workpieces enter the corresponding working procedure according to the processing requirements. There are bending, pressing riveting, flanging tapping, spot welding, punching convex hull, segment difference, sometimes after bending a couple of nuts or bolts to be pressed well, where there are die punching convex hull and segment difference should be considered to be processed first, so as to avoid interference from other processes after processing first, not being able to finish the work that was needed. When the upper cover or the lower shell has a clasp, such as after bending can not touch welding to be processed before bending.
5. Welding
WELDING HAS ARGON ARC welding, spot welding, carbon dioxide protection welding, shielded metal arc welding, spot welding first to consider the position of the workpiece welding, in mass production, consider doing positioning tooling to ensure spot welding position accuracy. In order to weld firmly, the bump on the workpiece to be welded can be made in uniform contact with the plate before electric welding, so as to ensure that the points are heated in accordance with each other, but also to determine the welding position, similarly, to be welded, to adjust the pre-pressing time, holding time, maintenance time, rest time, to ensure that the workpiece can be spot-welded firmly.
In addition to the strict requirements in the production process, the quality of sheet metal parts needs to be independent of the quality inspection in production. One is to strictly check the dimensions according to the drawings, the other is to strictly check the appearance quality, and to carry out repair or scrap treatment for those dimensions that do not conform, the appearance is not allowed to scratch, color difference, corrosion resistance, adhesion and so on after spraying. In this way, we can find the errors in the expansion diagram, the bad habits in the process, the errors in the process, such as the number of punch programming errors, mold errors, and so on.
6. Press riveting
When pressing and riveting, we should choose the same die with different Stud Height, and then adjust the press pressure to ensure the stud and the surface of the work piece are even, to avoid the stud not pressing firm or pressing out beyond the surface of the work piece, resulting in the work piece scrapped.
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