Press Tonnage to Stamp ss304

In one hit or by some sort of slicing action?

in one hit

So the force required is the product of the shear stress of the material (not available here) times the area of the cylindrical surface of the hole, which is diameter x pi x thickness, all converted to the correct units. Is this going in the right direction?

When you say stamp, I assume you are forming some shape. The force required depends a great deal on the shape. How many bends, curves, bumps, etc. and to what depth is the material stretched?

Why are you using full hard material? If the shape has any complexity, it will be work hardened in the pressing process.

The cutting is the easy part.

To calculate force required F, use F= {S x L x T } divided by 1000

Where F = force in kilonewtons { divide by 10 for approx. tons }, S= shear stress of material in megapascals, L= total lenght of cut peripheries in mm, T= thickness of material in mm.

If shear on the punch or die is equal to about 2/3 material thickness it will approx. halve the force required or if using multiple punches in the same station staggering their height by the same amount will reduce the force.

Shear on punches or staggering heights will also reduce the "press noise" in the shop when running, can just make them a bit harder to resharpen.

Brien

Ans :

22/7 x 41 x0.4 x 54kgf/mm²(=UTS)x1/2 ( Brien's Factor)=1.3 Ton-Force ~