Page 93 - MetalForming October 2017
P. 93
The Science of Forming
50 40 30 20 10
0
Location A
6.8
Location B 6.8
6.0 5.0
Grid Pattern Centers
6.0 3.8
2.5 Depth
Grid Pattern Centers
5.0
Fig. 4—Location A has a continuous deformation from start to maximum. Location B concentrates all deformation in the last 2 in.
shows that the usual operator for this press took vacation for those two weeks. The operator was known for constantly changing the settings of the press. During his vacation the press was set once at the start of production, and the settings were not touched until his return.
Problem: Two different areas on the same stamping have the same final strain distribution/gradient (Fig. 4). However, Area A is stable and does not experience breakage. Area B is unstable and always encounters severe breakage. The forming process in Area B must be changed.
Complete manuals have been written about these prob- lems. Problems even emerge when one party uses true strain and another uses engineering strain. MF
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MetalForming/October 2017 91
Engineering Strain (percent)
