Stamping parts processing plant talk about the deformation characteristics of sheet metal bending

The stamping parts processing plant talks about the characteristics of deformation when the sheet metal is bent, and analyzes how the sidewall grid and section of the workpiece before and after the deformation are like; 1. The deformation zone mainly occurs in the rounded part of the bent part, and the straight part is not deformed, but is rigid Moving; 2. From the perspective of the cross section of the bending deformation zone of the stamping parts processing plant, for the bending of narrow plates (the ratio of width to thickness b/t>3), the cross section remains almost unchanged, still rectangular. This is because the relative width b/t of the sheet material directly affects the strain of the sheet material along the width direction, which in turn affects the stress; therefore, the stress and strain state are different for different b/t; 3. Regardless of whether the sheet is narrow or wide Plate, in the deformation zone, the length of the longitudinal metal fiber has changed, the inner layer (on the side of the punch) is compressed and shortened by the longitudinal fibers, and the outer layer (on the side of the die) is stretched by the longitudinal fibers; From the inner surface to the outer surface, the length of the longitudinal fibers changes continuously, so there is an intermediate layer between the inner layer and the outer layer that is neither elongated nor shortened, called a strain-neutral layer; the volume remains unchanged according to plastic deformation The principle is that the outer longitudinal direction is the maximum elongation strain, so the transverse and radial directions are both the elongation strain, the inner longitudinal direction is the maximum compressive strain, and the transverse and radial directions are both compressive strains; 4. When the bending radius is small in the stamping parts processing plant, The compressed material flows in the direction of the end surface and forms bumps on the side of the sheet. The height of the bumps is between (0~0.5)t; the smaller the bending radius and the later the material, the higher the bumps formed; this kind of convexity Point pairs and parts that need tailored welding will have an adverse effect; recommended article: What is the method of bending metal stamping parts? Previous article: What is the method of bending metal stamping parts?