Computer operation cabinet What are the requirements for the process of sheet metal processing?

There are the following technological requirements in the sheet metal processing of computer operating cabinets:

Material preparation

Material selection: the suitable sheet metal material should be selected according to the use environment and strength requirements of the cabinet. Generally speaking, the commonly used materials for computer operating cabinets are cold-rolled steel plates and stainless steel plates. Cold-rolled steel plate has good strength and processability, and the price is relatively affordable; Stainless steel plate has good corrosion resistance and is suitable for harsh environment.

Material inspection: the thickness tolerance of the material should meet the standard. For example, for cold-rolled steel plates with a thickness of 1-2mm, the thickness tolerance is usually required to be controlled within ±0.1mm. At the same time, it is necessary to check whether there are scratches, oxidation, corrosion and other defects on the surface of the material to ensure the quality of the material is qualified, so as not to affect the appearance and performance of the subsequent processing and cabinet.

Cutting technology

Cutting accuracy: Cutting is the process of cutting large plate material into small sheet metal parts with required size. The precision of blanking size is high, and the general linear dimensional tolerance is controlled within 0.5 mm. For example, for a cabinet, the side panel size is required to be 500mm×600mm, and the actual blanking size should be between 499.5mm-500.5mm and 599.5mm-600.5mm to ensure the accuracy of subsequent assembly.

Selection of cutting mode: according to the thickness and shape of the material, different cutting modes can be selected. For sheet metal materials with thin thickness (less than 3mm), numerical control shearing machine can be used for cutting, which has the advantages of fast cutting speed and high precision. For parts with complex shapes or curved contours, laser cutting machine can be used, and its cutting accuracy can reach ±0.1mm, which can meet the processing requirements of complex shapes.

Bending process

Bending angle accuracy: Bending is one of the key steps of cabinet forming. The accuracy of bending angle directly affects the assembly and appearance of the cabinet. Generally, the bending angle tolerance is required to be controlled within 1. For example, for a 90 bend angle, the actual angle should be between 89 and 91.

Bending radius control: the bending radius also needs to be strictly controlled, which depends on the thickness and performance of the material. In general, the radius of internal bending should not be less than the thickness of the material to avoid material fracture. Such as 1.5mm thick cold-rolled steel plate, the internal bending radius is generally not less than 1.5 mm. At the same time, in order to ensure the appearance quality, obvious folds or cracks should be avoided at the bend.

welding technology

Selection of welding methods: For computer operating cabinets, commonly used welding methods include carbon dioxide gas shielded welding and argon arc welding. Carbon dioxide gas shielded welding is suitable for welding thick sheet metal parts, with fast welding speed and low cost; Argon arc welding is suitable for welding stainless steel and other materials that require high weld quality. The weld quality is beautiful and the strength is high.

Weld quality requirements: the weld should be uniform and continuous, without defects such as porosity, slag inclusion and cracks. The weld height is generally determined according to the thickness of sheet metal parts. For example, for sheet metal parts with a thickness of 2-3mm, the weld height is generally controlled between 2-3 mm.. At the same time, the welding deformation should be controlled within a certain range, which can be reduced by reasonable welding sequence and welding process parameters.

Surface treatment process

Degreasing and derusting: Before surface treatment, the cabinet needs to be thoroughly cleaned to remove oil and rust on the surface. Chemical cleaning agent can be used for cleaning, and then clean with clear water to ensure that there is no oil stain and rust residue on the surface, which provides a good foundation for subsequent surface treatment.

Spraying requirements: surface spraying is an important measure for cabinet protection and beauty. Before spraying, the cabinet surface should be phosphatized to enhance the adhesion of the coating. The spraying thickness should be uniform, and the coating thickness is generally required to be between 60-120μm m.. The coating should be flat and smooth, free from sagging and bubbles, and have good corrosion resistance and wear resistance.