Due to the high yield point, high hardness and significant cold work hardening effect of 201 stainless steel itself, the characteristics of stainless steel plate bending are as follows:
1) Due to poor thermal conductivity and low elongation compared with ordinary low carbon steel, the required deformation force is large;
2) Compared with carbon steel, stainless steel sheet has a strong tendency to spring back during bending;
3) Compared with carbon steel, the stainless steel plate has a low elongation, and the bending angle R of the workpiece should be larger than that of the carbon steel during bending, otherwise there may be cracks;
4) Due to the high hardness of stainless steel plates and the significant cold work hardening effect, tool steels with heat treatment hardness above 60HRC should be selected when selecting press bending tools, and their surface roughness is an order of magnitude higher than that of carbon steel press bending tools.
According to the above characteristics, generally speaking:
1. Under the unit size, the thicker the plate, the greater the required bending force, and as the plate thickness increases, the margin of the bending force should be larger when selecting the bending equipment;
2. Under the unit size, the larger the tensile strength, the smaller the elongation, the larger the required bending force, and the larger the bending angle;
3. In the case where the plate thickness corresponds to the bending radius in the design drawing, according to experience, the expansion size of a bending workpiece is the addition of the right-angled sides minus the two plate thicknesses, which can fully meet the design accuracy requirements. According to the empirical formula, the expansion amount can be calculated. Simplify the calculation process and greatly improve production efficiency;
4. The greater the yield strength of the material, the greater the amount of elastic recovery. In order to obtain a 90-degree angle of the bending part, the angle of the required pressing knife should be designed to be smaller. Compared with carbon steel, the stainless steel with the same thickness has a larger bending angle. Special attention should be paid to this point, otherwise there will be bending cracks, which will affect the strength of the workpiece.