A common issue in the stamping world is sheet distortion, and it can be one of the most frustrating things to avoid. The stress that is caused by piercing sheet metal is one of the main reasons for distortion, which results in an unusable piece of material.
Unfortunately, there is no one solution that will completely avoid sheet deformation, but there are a few ways which can reduce it, therefore cutting down the amount of wasted resources.
Sharp Punches and Dies
It may seem like common sense and something that shouldn’t need reminding but, by keeping punches and dies sharp, a significant difference can be made. By regularly sharpening these integral components, the overall process will perform seamlessly and no additional force will need to be applied.
Correct Die Clearance
Make sure the die clearance is optimised based on the material being used and the thickness of the sheet. If the clearance is too large, then this can negatively impact the quality of the hole and increase the severity of ragged edges. If it is too small, then there is more chance of increased stress on the material which will therefore cause distortion.
Using a Presser Foot
By clamping the material flat with a presser foot, it reduces the chance of sheet distortion. Make sure that the pressure is correct for the specific material that will be punched, then be assured that the presser foot will successfully prevent the sheet from bowing. This tool can be used effectively with a variety of materials, and results are consistent sheet after sheet.
Although these solutions seem small, they can make a huge difference to manufacturing results and product quality. Take machine capabilities into consideration, as well as the range of tools used when applying any of these solutions.