According to the basic processing methods of sheet metal parts, they are blanked, bent, stretched, formed, and welded. This specification describes the process requirements to be noted for each processing method.

Cutting

The blanking can be divided into ordinary punching, several punching, shearing, laser cutting, and wind cutting according to the different processing methods. Due to different processing methods, the cutting processability is different. Sheet metal cutting methods are mainly punching and laser cutting.

Bend

Bending When the material is bent, the outer layer is stretched and the inner layer is compressed on its rounded area. When the thickness of the material is constant, the smaller the inner r, the more severe the tension and compression of the material; when the tensile stress of the outer fillet exceeds the limit strength of the material, cracks and breaks will occur. Therefore, the structure of the bent part The design should avoid excessively small bend fillet radii.

Stretch

的 The fillet radius between the bottom of the tensile part and the straight wall should be greater than the thickness of the plate, that is r1≥t. In order to make the stretching more smooth, r1 = (3 ~ 5) t is generally adopted, and the maximum fillet radius should be less than or equal to 8 times the thickness of the plate, that is, r1≤8t. Due to the different stresses on the stretched parts, the thickness of the stretched material will change. Generally, the bottom center maintains the original thickness, the material at the bottom rounded corners becomes thinner, the top near the flanges becomes thicker, and the material around the rectangular stretched corners becomes thicker.

Forming

Pressing ribs on plate-shaped metal parts helps to increase structural rigidity. Blinds are usually used for various shells or cabinets to play a role of ventilation and heat dissipation. The molding method is to cut the material by the edge of a convex mold, and The rest of the punches simultaneously stretch and deform the material to form an undulating shape that is open on one side.

Welding

Welding methods mainly include arc welding, electroslag welding, gas welding, plasma arc welding, melting welding, pressure welding, brazing, and sheet metal products are mainly arc welding and gas welding.

Arc welding has the advantages of flexibility, maneuverability, wide applicability, and all-position welding. The equipment used is simple, durable, and low maintenance costs. However, the labor intensity and quality are not stable enough, depending on the operator's level. Suitable for welding carbon steel, low alloy steel, stainless steel, non-ferrous alloys such as copper, aluminum, and other non-ferrous alloys. The flame temperature and properties can be adjusted. The arc welding heat source is wider than the heat affected zone. Welding of structures and small parts, welding of steel, cast iron, aluminum, copper and its alloys, cemented carbide, etc.