What quality problems should be paid attention to in the customized production process of sheet metal cabinet console?

In the process of customized production of sheet metal cabinet console, we need to pay attention to the following quality problems:

First, the quality of materials

Plate selection

According to the use environment and functional requirements of the cabinet console, the appropriate plate should be selected. For example, for cabinets that need good electromagnetic shielding performance, metal plates with good conductivity, such as galvanized steel plates and stainless steel plates, should be selected. If it is used in corrosive environment, 316L stainless steel plate is a better choice, because it contains molybdenum and has stronger corrosion resistance.

The thickness of the plate is also critical. Insufficient thickness may lead to insufficient cabinet strength and easy deformation. Generally speaking, 1.2-1.5mm thick plate may be enough for a small cabinet console with low load requirements; For large cabinets with heavy equipment, the plate thickness may need to reach 2-3 mm.

Inspection of materials

Raw materials should be strictly inspected when they are purchased. Check the flatness of the plate, place the plate on a horizontal platform, and check the gap between the plate and the platform with a feeler gauge. The gap should be within the allowable range, such as less than 0.5 mm. At the same time, check whether there are any defects such as scratches, oxidation and delamination on the surface of the plate. Defective plates should be returned in time to avoid being used in production.

Second, the quality of sheet metal processing technology

Cutting quality

Cutting is the first step of sheet metal processing. In the process of cutting, it is necessary to ensure the accuracy of cutting size. For example, for the door panel and side panel of the cabinet, the cutting dimension tolerance should be controlled within ±0.5mm to ensure the subsequent assembly accuracy.

The quality of the cutting surface is also very important. The edge after laser cutting should be smooth and burr-free. If plasma cutting is used, there may be more oxide slag and burr after cutting, which needs to be polished and cleaned to make the roughness of the cutting surface reach Ra 6.3-Ra 12.5 μ m.

Bending quality

The bending angle accuracy should be high. The bending angle tolerance of general cabinets should be controlled within 1. Attention should be paid to avoid cracks on the surface of the plate during bending. This requires a reasonable choice of the radius of the bending die according to the material and thickness of the plate. For example, for a cold-rolled steel plate with a thickness of 1.5mm, the bending die radius should generally not be less than 3mm to prevent cracks on the surface of the plate.

The size after bending should also meet the design requirements. For example, after the frame of the cabinet is bent, the length tolerance of each side should be controlled within 1 mm to ensure the squareness and overall stability of the frame.

welding quality

Welding is a key link in the manufacture of sheet metal cabinet. Weld should be uniform and full, and there should be no defects such as porosity, slag inclusion and incomplete penetration. For example, when welding the frame structure of the cabinet, for fillet weld, the leg size should meet the design requirements, and the deviation should not exceed 1 mm.

Stress relief shall be carried out after welding to prevent the cabinet from being deformed due to welding stress during use. Vibration aging or heat treatment can be used to relieve stress. For example, for a large sheet metal cabinet, after welding, it is placed on vibration aging equipment and treated according to appropriate vibration parameters (such as vibration frequency, vibration time, etc.) to effectively reduce welding stress.

Third, the quality of surface treatment

Spraying quality

Before surface spraying, the sheet metal parts should be pretreated, including degreasing, derusting and phosphating. Oil removal should be thorough, and the oil removal effect can be judged by checking the continuity of water film. If the water film does not break on the surface energy of sheet metal parts for more than 30 seconds, it shows that the oil removal effect is good.

The thickness of the sprayed paint film should be uniform, and the thickness of the paint film on the outer surface of the cabinet is generally required to be between 60 and 100 μ m. The adhesion of paint film is strong, which can be detected by cross-off test. After cross-off, the peeling area of paint film should not exceed 5%.

Electroplating quality

The electroplated layer should be bright and uniform, without missing plating and peeling. For cabinet parts that need electroplating, such as handles and locks, the thickness of electroplating layer should meet the requirements. For example, the thickness of galvanized layer is generally between 8-12μm to ensure good corrosion resistance.

Fourth, the quality of assembly

Assembly accuracy of parts

When assembling the components of the cabinet console, ensure the accurate installation position. For example, when installing the guide rail, the parallelism tolerance of the guide rail should be controlled within ±0.5mm/m/m to ensure that the drawer or equipment can be installed and slid smoothly.

The fit clearance between parts should be reasonable. For example, the gap between the cabinet door and the cabinet body should be uniform, generally the unilateral gap is between 1 and 3 mm, which can not only ensure the normal opening and closing of the cabinet door, but also prevent foreign objects such as dust from entering the cabinet.

Overall structural stability

After the assembly, the stability of the cabinet console should be tested. For floor-standing cabinets, under the condition of full load (placing equipment with specified design weight), the inclination angle should not exceed 3. By checking the fixing of the casters or feet of the cabinet and the firmness of the connection of the frame, it is ensured that the cabinet will not damage the equipment due to shaking or dumping during use.