As sheet metal stock hardness increases, what should the clearance between punch and die be?

I am not sure, sure it be increased or decreased or does it stay the same?





thanksAs sheet metal stock hardness increases, what should the clearance between punch and die be?
Hard materials shear very nicely with part of the cross section failing in brittle fracture, so the gap can increase. Soft materials smear and make nasty burrs, so they need smaller gaps.As sheet metal stock hardness increases, what should the clearance between punch and die be?
I'm not sure the hardness has that much of an effect on sheet. In any punching process you want as clean a cut as possible, though it may be that the load required for a cut could increase, and the distortion of the dies might increase slightly, in which case I would think the clearance increases. If not it stays the same.