Generally, the sheet metal fabrication methods of sheet metal chassis parts are fixed, consisting of cutting, bending, stretching, forming, and welding. But what about these processes?
Compared with other processing industries, sheet metal chassis processing technology is a more complex and demanding process. Correspondingly, there are many problems in the sheet metal fabrication process. Then, how to deal with these problems? Next, we will introduce to you one by one.
Welding methods mainly include arc welding, electroslag welding, gas welding, plasma arc welding, fusion welding, pressure welding, and brazing. Sheet metal fabrication products mainly include arc welding and gas welding.
Arc welding has the advantages of flexibility, mobility, wide applicability, and can be used for all-position welding; the equipment used is simple, durable, and low maintenance costs. However, the labor intensity is large and the quality is not stable enough, which depends on the level of the operator. Suitable for welding carbon steel, low-alloy steel, stainless steel, copper, aluminum and other non-ferrous alloys above 3mm. The gas welding flame temperature and properties can be adjusted. The heat source of arc welding is wider than the heat affected zone, the heat is not as concentrated as the arc, and the productivity is low. It is used for thin-walled structures. For welding with small parts, it can weld steel, cast iron, aluminum, copper and its alloys, cemented carbide, etc.
The fillet radius between the bottom of the drawing piece and the straight wall should be greater than the plate thickness, that is, r1≥t. In order to make the stretching process more smoothly, generally taking r1=(3~5)t, and the maximum fillet radius should be less than or equal to 8 times the plate thickness, that is, r1≤8t.
The tensile parts of sheet metal fabrication are different in size due to the stress everywhere, so that the thickness of the material after stretching will change. Generally speaking, the center of the bottom maintains the original thickness, the material at the bottom rounded corners becomes thinner, the material at the top near the flange becomes thicker, and the material at the rounded corners around the rectangular stretched piece becomes thicker.
According to the different processing methods, the blanking can be divided into general punching, counting punching, shear cutting, laser cutting, and wind cutting. Because of the different sheet metal fabrication methods, the processing technology of the blanking is also different. The blanking methods of sheet metal fabrication are mainly punching and laser cutting.
When the data is zigzag, the outer layer is stretched on the rounded corner area, and the inner layer is compressed. When the thickness of the material is constant, the smaller the inner r, the more severe the stretching and contraction of the material; when the tensile stress of the outer fillet exceeds the ultimate strength of the material, cracks and breaks will occur. Therefore, the structural design of zigzag parts should avoid too small zigzag fillet radius.
Pressing ribs on plate-shaped metal parts helps to increase structural rigidity. Louvers are usually used for ventilation and heat dissipation effects on various covers or casings. The forming method of sheet metal fabrication is to use the edge of the punch to cut the material, and the rest of the punch will stretch the material together to form a rugged shape with one side open.
1. The appearance of the chassis cabinet is planned as a server. In addition to the common black and white colors, the excellent chassis will incorporate various appearance features in the panel planning, and the shape is generous and decent, prudent and lively. The color mix is fair, giving the impression that it is both eye-catching and practical.
2. Sheet metal fabrication processing on the appearance of hardware
Generally, painting and electroplating are used to prevent rust, forming a protective film on the surface and preventing static electricity. Special instructions for the internal planning of the case: high-quality case body is less lacquered and electroplated. Inexpensive cabinets with poor materials are generally spray-baked and electroplated in the cabinet.
3. The previous chassis used the screw-fixed plan, and a lot of screws and screwdrivers were indispensable for installation. The disassembly of the device was often time-consuming and troublesom. Now the chassis uses the buckle-type or hand-tight screw plan, which facilitates disassembly and assembly, which greatly speeds up the installation.
Not only are screws on the outside of the chassis, but the interior is also improved. It uses a pull-and-plug design and uses plastic clips to fix the internal components. The chassis generally uses manual screws in the planning, which can be quickly disassembled without using a screwdriver, which saves a lot of the hard work of often installing and disassembling hardware.
The above is the relevant knowledge that we have introduced to you about the chassis sheet metal fabrication technology and how to deal with the problems that occur during the chassis sheet metal fabrication. I hope it will be helpful to you.
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