What are the key technologies in sheet metal processing?

It starts from the design of sheet metal products, then sheet metal processing drawing, sheet metal unfolding drawing, laser cutting down, sheet metal bending, welding, grinding, painting, packaging, and finally delivery to customers.

First of all, sheet metal design is a must. When designing, we must consider how to bend because deficiencies in the design can lead to the scrapping of sheet metal parts, processing difficulties, and failure to shape. The sheet metal bending process is the key to the sheet metal processing design.

The bending process usually consists of three parts, from top to bottom, which is the upper die, sheet metal dies, and lower die. The combined effect of the upper and lower dies determines the radius of the curvature of the sheet metal part to be bent. Simply put, based on engineering experience, the bending radius is controlled within a certain reasonable range, not too large and not too small. If the radius of curvature is too small, cracks may occur in the curved part of the sheet metal part. If the bending radius is large, the bending effect cannot be achieved, and the rebound angle is difficult to control. In fact, no matter how large the bending radius is, there exists a rebound angle within the mechanical deformation of the sheet metal part itself, so the actual angle after bending should be the sum of the predetermined angle of the die and the natural rebound deformation angle. Therefore, it is necessary to consider whether the machine tool can be used directly for positioning. Otherwise, two small squares are retained for positioning and removed after bending.

Metal plate bending direction considerations: non-ferrous metals and copper plate bending, respectively. Since the direction of the material weave during rolling depends on its weave direction, therefore, the material weave direction is required to be bent vertically instead of parallel bending; otherwise, it is easy to produce bending cracks.

Leave a bending avoidance gap: When sheet metal is bending, there is a wrap and wrap relationship between the two bending surfaces. When making unfolding drawings, the bending should avoid generating gaps. This is because when the bend of the sheet is greater than 90 degrees, it will produce a rebound. In order to avoid a rebound of fewer than 90 degrees, it needs to be bent more than 90 degrees to eliminate the rebound. Therefore, a gap should be left to avoid bending kickback.