I thought someone here might know...
We're discussing draw dies in school. When dealing with deep draws, frequently the final shell must be made in two or more drawing operations (redraws).
We have simple formulas to calculate draw tonnage for simple shapes (obviously only predictions).
My question is this: If you calculate the tonnage required to perform, say, a 70% reduction in *one shot* (not ideal, if even possible), would the tonnage required for multiple draws to obtain the same final shell be the same as the single-shot tonnage?
This is mostly just interesting as opposed to important, as far as I'm concerned. It does, however, have very real applications in industry.
Does anyone know the answer for sure? I have the "Die Design Handbook" vol.
3 but the math is over my head, as well as the theory.Regards,
Robin