3 Fundamentals of press design

Shearing lines
F
F
resistance welding
Fig. 4.6.26 Comparison of the principle layouts of resistance, laser and induction welding
systems
2s. The process cannot be executed on a continuous basis, as part transport
must be interrupted during welding.
After the welding process, the parts pass through the monitoring station
and the beading and oiling unit. The finished tailored blanks are then
stacked again and made ready for further processing in the forming line.
When deep drawing, depending on the position of the welded seam,
tailored blanks behave differently to conventional parts. If, for example,
the sheet metal thickness differs while the blank holder force remains
constant, wrinkles or tears can occur in the formed part. In these cases,
special blank holders which can be adjusted according to the formed
product, are used in the die set (Fig. 4.6.27).
heightdifference
oftheblankholder
blank blank
Fig. 4.6.27 Modified blank holder for deep drawing of tailored blanks
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
313
laser welding induction welding
die
tailoredblank
segmented
blankholder
clearance for
welding seam