Page 19 - MetalForming February 2015

to develop techniques on a production servo press. Pyper Tool, on the other hand, can contract time on the servo press so that a stamping customer can develop and hone its servo stamping expertise.
Servo Tryout a Logical Next Step
Bringing in a servo-driven press was not the idea Jeff Pyper, president of Pyper Tool, originally had in mind.
“We took a 450-ton mechanical try- out press out of service for repair,” recalls Pyper, “and as it was torn apart offsite the repair estimates escalated. At that time, our goal was to upgrade the press and add some speed, and also add a feed line. Given the high repair cost, we considered purchasing a used press, but the used-press market is tight, which impacted price.”
Pyper conducted research and found that servo-driven units comprised the majority of new presses currently sold in North America. That got him thinking.
“The future will see a need for tool- ing built for servo presses,” he says. “Today I see many stampers placing their traditionally built tools into servo presses, and making adjustments based on what the servo press can do. I thought a long-term strategy would be to have a servo press in our die shop so that we could perform research and development and come up with some new techniques, new construction and new ideas to leverage the capabilities of servo presses.”
With this plan, Pyper sought out Aida-America.
Ultimately, the company delivered its DSF-N2-3000 model, employing a proprietary high-torque, low-rpm servo motors to provide direct drive that offers the same stroke length and torque rating of a conventional mechanical press while allowing full torque at speeds as low as one stroke/min., according to Aida offi- cials. In addition, capacitors storing power in the nonworking portion of the stroke reportedly enable power con- sumption less than that of a mechanical press.
The flexibility of servo technology in speed, dwell time, etc., enables all man- ner of opportunities for Pyper Tool to
better serve its stamping customers and position itself as a leader in die design and build.
Can Better Match Customer Conditions
Down the road, Pyper hopes to assem- ble enough expertise to design tooling that specifically takes advantage of servo- press attributes. But in the meantime, the tool builder is using its new machin-
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ery to match the conditions that tooling will face in customers’ presses.
“My goal is to use this press to sim- ulate the press rates provided in cus- tomer quotes,” Pyper explains. “Theo- retically, given enough information on the presses a customer will be running the tools in, we can simulate the actu- al curves of the press. So we can accu- rately simulate the customer’s stamp- ing experience and, hopefully, provide

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