High Speed Stamping

Two possibilities:

- not right stuff for the tool which is not able to absorb the dynamic energy flow at cutting.

- not correct gap dimensions between tools.

The number of cycles and the geometry of chipped edge could give a hint about the reason. Better provide a good picture and numbers.

Hardness is not all there are several other factors.

Could also be play in the tooling. But sounds like incorrect clearances. i.e. .008 clearance punch and die being used on .012 or similar.

The first thing you need to do is to confirm and optimize clearances. If chipping continues to be a problem, you will require tougher tooling material. Toughness is loosely defined as the ability to absorb impact without fracture. There is usually a trade-off between hardness and toughness.

As you see all counsels do converge to first indications so the best would be you send the pictures and you give indications about gap/clearance/ or how you want to call it under different names it is the same : distance between male and female profiles which has to be adapted to cut material and thickness. An other aspect is the edge geometry itself if radius and angles are not right then the shear stresses can be VERY high. Do not forget after how many cycles the chipping appears and if for the different tools the cycling is the same. Is a particular edge chipping or the destruction appears at different positions on the edge ? Such details are important for a correct analysis.

For the 2 other participants:

thanks for the support given to my thoughts.

Given no facts about workpiece material or lubricant, we can do little more than speculate.

Hardness does not equate to toughness, nor does it assure shock resistance.

Tolerance control of dies as well as of material is an area to investigate.

What is lubricant? how do you know it is consistently being applied?

More facts. More facts. More facts. are needed.

milo