These problems should be paid attention to in the processing of U-shaped stamping parts

Stamping parts processing plant, processing auto and motorcycle parts, stainless steel stamping parts, special-shaped parts, in the process of automotive stamping parts processing, the bending rebound of U-shaped stamping parts is the key content of the bending process research;


1. The law of bending of U-shaped stamping parts


Since the flat plate of the stamping part has been bent into a U-shaped part, compared with the same material thickness, the rebound angle is reduced, and the fillet radius of the punch is increased, so how much is the fillet radius of the punch? ? After analyzing various data, it is found that the bending law of U-shaped stamping parts is related to the following factors;


1. The mechanical properties of the material


The rebound angle is proportional to the yield point of the material, and inversely proportional to the modulus of elasticity,


2. Relative bending radius r/t


is the bending radius of the workpiece along the length direction, t is the height of the U-shaped piece, the smaller the r/t value, the greater the deformation of the rounded corners. Under the same other conditions, the springback angle increases with The increase of r/t increases;


2. U-shaped bending stamping parts have less springback than V-shaped parts, the shape of the workpiece is complicated, and the parts are more involved in each other, and the springback is more difficult;


3. In terms of mold design, the greater the gap between the convex and concave molds of the U-shaped bending mold, the greater the springback of the parts after unloading. Because of the excessive mold gap, the degree of bonding between the material and the mold is reduced, and the Reduce the radial constraint on the straight edge of the bending part, so that under the same other conditions, the larger the gap, the smaller the plastic deformation of the bending part, and the greater the springback of the part after unloading, but for U-shaped For bending stampings, the amount of springback decreases as the opening depth of the die increases, and the smaller the mold gap, the smaller the springback;