Special bending die is selected for forming and bending of automobile sheet metal parts

2021-11-26 16:52:35

So how to choose the bending die for automobile sheet metal processing?

Bending die is divided into standard die and special bending die according to bending process. Under standard bending conditions (right angle and non right angle bending), standard molds are generally used for bending, and special molds are used for bending some special structural parts (such as segment difference bending, dead edge pressing, etc.). In addition, when bending plates with different thickness, the opening size of the bending die and the size of the "V" groove are different. Generally, the opening size of "V" groove is 6-10 times of the plate thickness (6T for 0.5 ~ 2.6mm, 8t for 3 ~ 8mm, 10t for 9 ~ 10mm and 12t for more than 12mm).

When the plate is thin, the orientation is decimal, and when the plate is thick, the orientation is large. For example, 12mmv groove can be selected when bending 2mm plate. The angle of standard bending is generally not less than 90 degrees, and the sharp angle of upper die and lower die of standard bending machine die is usually 88 degrees. In case of non-standard bending, different upper die shapes can be selected, and different angles and shapes of plates can be bent. For sheet metal parts with special shape, special bending die can be selected for forming and bending.

When the material is bent, on the fillet area, the outer layer is stretched and the inner layer is compressed. When the material thickness is constant, the smaller the internal R is, the more serious the tension and compression of the material are; When the tensile stress of the outer fillet exceeds the ultimate strength of the material, cracks and fractures will occur. Therefore, too small bending fillet radius should be avoided in the structural design of bending parts.

Stainless steel automobile sheet metal parts are generally the general name of stainless steel sheet metal parts and acid resistant steel. Stainless steel sheet metal parts refer to the steel resistant to the corrosion of weak media such as atmosphere, steam and water, while acid resistant steel refers to the steel resistant to the corrosion of chemical etching media such as acid, alkali and salt. Stainless steel sheet metal parts have a history of more than 90 years since they came out at the beginning of this century.