Page 32 - MetalForming September 2016

Servo Technology
a servo press, eliminate the wasted angle and timing that is lost in a typical cycle. These characteristics also com- pensate for press stopping time on a servo press when compared to a stan- dard mechanical press.
Optimizing the Working Energy System
“In a servo press, with the servo motors supplying continuously variable working energy at any speed,” explains Stamtec’s Ellard, “a servo press can opti- mize productivity based specifically on time-optimized motion profiles. Those profiles must fit within the specific press and process parameters—maximum motor speed, the available working area during the stroke, maximum slide speed and optimal forming speed of the slide—but are more or less infinitely variable within those parameters.”
Ellard, along with Siemens’ Barry, will dive deeply into this subject, while explaining how and why servo tech- nology optimizes flexibility in the press-
room. Ellard also stresses that, “with all of the flexibility and possibilities, it might seem like a servo press will immediately simplify a stamper’s life. In many cases it will, but stampers must actually be more knowledgeable about their tooling than they are when specifying a conventional mechanical press, so that they make the right choic- es when working with their supplier to configure a new servo press.
“The ability of a servo press to provide optimized productivity,” he continues, “comes at the potentially high expense of peak-current demands from the servo system. There are two ways to minimize energy use—optimize the drive config- uration to match the application of the press, to avoid oversizing the system; and employ some level of energy-opti- mization technology.” Ellard and Barry will expound on these options.
Adds Barry: “Lack of any type of ener- gy management can significantly impact the total cost of ownership, and every servo-press design has its unique energy
requirements. This results in specific energy-management calculations. The press must be optimally configured for speed, energy and energy provided at a specific distance off bottom.
“There are specific opportunities for stampers to save money here,” he con- tinues. “Stampers must know what they are signing up for when they invest in a servo press. For example, a 1000-ton conventional mechanical press with a 250-hp drive may require 400 A of input power, while a 1000-ton servo press might require 2000 A (with no energy management). This is a huge disparity, but when understood and planned for using the right energy-management approach, it can be mitigated.”
Energy-management strategy, a pri- mary discussion point for Ellard and Barry at the Servo Technology Experi- ence, centers on the use of energy-stor- age devices integrated with and con- trolled by the motion system. A press lacking such add-ons requires all of the mechanical power from the motor to
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