Conclusions

Firstly the structure of the production costs and the hourly cost of punching from sheet, punching from coil and stamping with press and die has been analysed. Punching from sheet and from coil were then compared.
The result is that punching from sheet is indicated for manufacturing pieces with complex shapes or for very small production runs (from 1 to 50 pieces). For simpler shaped pieces (rectangles, squares, notched and punched panels) and for medium and small productions (from 200 to 500,000 pieces), punching from coil is always preferable. Lastly punching from coil and stamping by press were compared. The result is that stamping by press is to be preferred for large and volume mass production (millions of pieces), while, again, punching from coil is more indicated for medium and small production runs. In more general terms, a simple formula has been obtained that, given the tool cost, the hourly cost of the coil punching machine and its production time, gives the number of pieces N below which it is more economic to punch from the coil than to stamp by press.

"Punching and stamping: how to compare production cost."
Article taken from "Lamiera" Magazine: October 2005

CONTENTS

Conclusions