Page 43 - MetalForming August 2015

Tooling by Design
as a fulcrum, is positioned on center. It keeps the teeter-totter (slide) perfectly balanced. A centered stamping load prevents slide tipping and the associ- ated pressure working against the press gibbing.
Selecting a straightside press with a two-point connection significantly reduces the teeter-totter affect with off-center loads. However, this does not mean setting a die in a machine with a two-point connection will serve as a cure-all for slide tipping. A slide with a two-point connection and sin- gle-end drive (Fig. 2) is subject to angular misalignment proportional to the amount of torque transmitted through the crankshaft. This angular misalignment causes the press slide nearest the drive system to reach bot- tom dead center first. However, a twin-end drive arrangement (Fig. 3) drives the crankshaft equally from both ends. This provides a great deal more accuracy, especially under load, as compared to a single-end drive system.
Widely spaced slide connections also can combat the negative effects of off-center loading. By placing the con- nection points toward the outside of the slide, the greater distance between the connection points increases the stability of the slide and enables the press to resist the effects of tipping under off-center loads.
Lube-free preloaded roller-slide guide systems also help minimize the effects of slide-tipping conditions. Zero clearance improves slide guid- ing, while the system’s preloaded characteristic provides immediate resistance to any lateral slide move- ment. The zero clearance of lubeless roller slide guides provide accurate guiding of the press slide, keeping it parallel throughout the loaded con- dition. The dry slide guide employs a proprietary roller-bearing mount that can swivel. This helps the roller main- tain contact with the guide surface on the column during off-center load situations. MF
Booth S4363
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