3 Fundamentals of press design

Blanking processes
56.8% 65.0% 67.4% 73.2%
Fig. 4.5.7 Strips using single and multiple-row punch arrangement with utilization
factor � A in %
a
l e
l a
b
b
L
l e
l a
Fig. 4.5.8 Definitions on the strip: d hole diameter; a rim width; b web width;
i side cutter waste; l e web length; l a rim length; b S strip width;
L strip length; V feed step; t pitch; a R space between the rows
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
d
i
b
b
= t
a
a
a
6 °
273