Page 34 - MetalForming August 2015

Servo-Press Technology
strip out of the way, the parts can be ejected—triggered by a programma- ble limit switch. The press only raises enough to allow the part to be ejected, then reverses direction and passes back through bottom dead center, releases the strip and lifts back up. The control sends a command to the feed on the way up and the press stops while await- ing a sensor input indicating that the
strip has been fed for- ward. When the sensor indicates that the strip has fed into position, the press then reverses direction, thus restarting the entire sequence. The press never passes
through the top of the stroke...some- thing impossible to do without a servo press.
“We pass through the same posi- tions multiple times but only activate certain devices on some of them,” says Djubek. “The control made program- ming this quite simple. It was very intuitive.”
Compared to the previous forming
process, the part stays dead flat without a second tool and manual operation.
“We reduced the cost to manufac- ture a quality part, reduced work in process and reduced tooling expense for our customer,” says Djubek.
“The new technology plus our cre- ative team looking for ways to apply the servo’s new capabilities are exactly what we need to stay ahead of our competi- tion, foreign and domestic,” adds Erick Ajax. “The sales and estimating group are looking at every new opportunity to improve the work we do for our cus- tomers with the new servo-press tech- nology. It gives us a significant advan- tage that will separate us from those using aging technology.” MF
The slide’s motion profile is programmed in steps on the servo press’ control, with velocity set at various positions above bottom dead center (BDC). This particular program enables a rapid and brief deceleration at a position where blanking occurs, resulting in a significantly reduced reverse load. This allows materials such as stainless and HSLA steel to run at high parts/min. output while reducing damage to equipment and tooling caused by reverse load.
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32 MetalForming/August 2015
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