Page 45 - MetalForming May 2011

Tooling by Design
Other advantages of servo-drive presses include the abil- ity to program stroke and slide velocity, to dwell anywhere in the stroke, and to dwell at BDC, all without energy loss. These machines can yield high productivity, low maintenance and low energy costs.
Servo-drive press technology allows stampers to freely pro- gram the slide motion curve to reduce cutting speeds and snapthrough forces without compromising productivity. The slide approach, forming speed and slide return speeds also can be optimized to suit the part and the automation process. This can significantly reduce total cycle time and improve part quality.
A servo-drive press can be programmed to make multiple hits on the workpiece at or near BDC, which has been shown to reduce springback in some cases. This can prove very beneficial when forming AHSS materials, due to their high propensity to spring back after forming.
When comparing flywheel-drive and servo-drive mechanical press technologies, remember that although there are key differences between the press types, the fun- damental principles of tonnage and energy always apply.
MF
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