Blanking: blanking according to the different processing methods, can be divided into general punching, number punching, scissors open material, laser cutting, wind cutting, because of the different processing methods, blanking processing technology is also different. Sheet metal blanking mode main

The outer layer is stretched and the inner layer is compressed when the thrust and laser-cut bending material is bent over its rounded corners. When the material thickness is fixed, the smaller the inner R is, the more serious the material tension and compression will be. Cracks and fractures occur when the tensile stress of the outer fillet exceeds the ultimate strength of the material. Therefore, the structural design of curved parts should avoid too small a fillet radius.

Stretch: The fillet radius between the bottom of the stretch piece and the straight wall should be greater than the thickness of the plate, i.e. R1 ≥ T. In order to make the drawing go more smoothly, r1=(3-5)t is generally taken, and the maximum fillet radius should be less than or equal to 8 times of the plate thickness, i.e

R1 8 t or less. The thickness of the stretched material will change due to the different stress applied in different places. In general, the center of the bottom remains the same, the rounded corners at the bottom become thinner, the top near the flange become thicker, and the rounded corners around the rectangular stretch become thicker.

 

Molding: in the plate metal parts on the reinforcement, is conducive to increase the structural rigidity, louver is usually used for a variety of housing or housing to play the role of ventilation and heat, the molding method is to cut the material by one side of the punch edge, and the rest of the punch material at the same time to stretch deformation, forming one side of the opening of the undulating shape.

Welding: Welding methods mainly include arc welding, electroslag welding, gas welding, plasma arc welding, fusion welding, pressure welding, brazing, sheet metal products welding mainly for arc welding, gas welding. Arc welding is flexible, maneuverable, widely applicable and can be used for all-position welding. The equipment used is simple, good durability, low maintenance cost advantages. But the labor intensity is big, the quality is not stable enough, the decision depends on the operator level. Applicable welding more than 3 mm of carbon steel, low alloy steel, stainless steel and copper, aluminum and other non-ferrous alloy welding flame temperature and properties can be adjusted, the welding heat source, heat affected zone width, the heat is better than arc concentrated, low productivity is applied in the welding of thin wall structure and small weldable steel, cast iron, aluminum, copper sheet metal chassis acceptance standard inspection and test for the site can be the arrival of the goods specified in the contractor's or party a's products, the result should be consistent, and into the results for the final result. 1. The flatness of the bottom surface and other sides of the box body shall be 1mm. 2. The perpendicularity of the front and rear or left and right facades to the bottom of the box body is 1mm. 3. The parallelism of the top and bottom of the panel is 0.5mm, and the perpendicularity of the side and bottom is 0.5mm. 4. After the panel is loaded into the box body, it shall be vertical and straight. The perpendicularity between the side and the bottom surface of the box body shall be 0.5mm, and the parallelism between the bottom surface and the box body shall be 0.5mm. 5. To install the plug-box of the circuit board or the chassis, the assembly shall be carried out by means of tooling simulating the circuit board or the chassis. When the tooling is loaded and unplugged, the plug-box shall be properly fixed and stable without floating and loosening. Hardwired connectors should be positioned accurately, without abnormal blocking during insertion and extraction.