Key points of making a sheet metal bending process diagram
Sheet metal bending is the most important part of the production of sheet metal fabrication. The quality of the sheet metal bending will directly affect the production of the subsequent process and the quality of the entire product. The rationality of the sheet metal bending method will directly affect the processing cost. Therefore, we must determine the reasonable processing technology and make the correct bending process file (picture SOP/SIP) to facilitate the on-site operation when making the bending process diagram.
1. According to the material, material thickness, total length and tolerance requirements of the parts, determine whether the existing equipment and molding tools of our company have the ability to process, whether it is necessary to open the mold.
2. Determine the way of processing (bending or opening) according to the shape and size of the bend of the part.
1) Whether the existing mold can be bent, if it can not be based on the actual assembly relationship of the product, contact the customer to break down the material into several parts, and then combine them after processing. If it cannot be decomposed for other reasons, mold opening
2) After the mold is selected, the sheet metal bending sequence is optimal (the minimum number of times to change the mold and the number of materials to be transported, and the safest when operating).
3)For small edges that cannot be bent using the standard lower die, the expansion size can be appropriately increased during the expansion calculation process, and the flange size can be increased after obtaining the customer's consent without affecting the product function.。
3. When there are conflicts between the rivet, convex hull, tear, etc. and the bending on the part, it is necessary to specify a reasonable processing procedure.
4. When there is a hole in the part that is too close to the flange (that is, the hole will be deformed after bending), the hole can be opened first and then expanded to the standard aperture.
5 According to the actual assembly relationship, the tolerance is marked on the part's drawing for sheet metal bending dimension.
6. When formulating the SOP, it is necessary to clearly indicate that the machine tool and the mold used represent the bending shape and size of each knife. The key dimensions to be guaranteed are pointed out, and the crease level requirements are determined. The places to be protected on the map should be clearly marked.
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