Stamping parts are indispensable in our production. Sometimes, the processing of stamping parts may not meet the requirements. If the shape and size of the stamping parts do not meet the requirements, it is easy to cause quality problems in production. There are many reasons for this. Let‘s take a look together.

How to deal with non-compliance of stamping parts:

The rebound results in a failure:

　　From the analysis of the bending deformation process, it can be seen that the forces on both sides of the neutral layer are in opposite directions (external stretching, internal compression). After bending, the elastic recovery directions of the materials on both sides of the neutral layer are opposite, resulting in a significant rebound.

　　Bending deformation is usually limited to a local area of the material, the rest of the material is free, and the elastic jump is less constrained by the overall size, so the shape of the stamped part changes greatly.

　　When the width of the workpiece is more than 3 times the thickness of the material, the bow may sag along the width direction of the bending line, so there are some measures to overcome the rebound.

The main measures are:

1) Set the reinforcing ribs on the stamped parts. Pressing the reinforcing ribs on the bending will make it more difficult to rebound the bent parts, thereby improving the dimensional accuracy of the bent parts and the stiffness of the bent parts.

2) Use materials with high elastic coefficient, low yield limit, and stable mechanical properties.

3) Use correction (correction) bending when bending V-shaped parts.

4) When bending U-shaped parts, the stamping die uses a smaller gap.

5) The billet is annealed before firing to increase plasticity.

6) Use a small stamping fillet radius to prevent performance and workpiece cracking.

7) Convex, die structure method 3360 curved U-inch, stamping and upper plate using a cylindrical surface with a radius of about 20t, T is the material thickness), after bending, use the lower half to counteract the rebound of bending. Or, make the u-shaped bending punch to be inclined in both directions. If the thickness of the bending material is greater than 0.8mm and the plasticity is good, the stamping can be made into the shape shown in the figure below.

8) For circular bending with a large bending radius, a pulling process can be used.

9) Use a force much greater than the actual required bending force to create a corrective bend during the bending process.

The above is the treatment method for stamping parts that do not meet the requirements provided by EMAR. If you need to know the little knowledge of other stamping parts, you can continue to follow us, and we will analyze it for you from time to time.