Page 31 - MetalForming August 2012

for release by year-end. He says the control will allow servo-press users to select from among five types of feed profiles to match the variety of tasks that a servo press can perform.
“ServoPressSelect is an offshoot of our ProfileSelect (introduced in 2010),” explains Dallas president Joe Gentilia. “The idea is to minimize the stress imparted on the feed’s servo drive and mechanics, by creating a feed speed and acceleration profile. We look at the time available to feed and design the motion profile—slowly accelerate to feed speed, and then decelerate—to that allotted time.”
The five profile types available:
• Sinusoidal
• Triangular
• Trapezoidal with three equal
motion segments
• Trapezoidal with 1/4-1/2-1/4
motion segments
• Electronic gearing
As a result, the human-machine
interface (HMI) of the new control looks different than that for the stan- dard feed control. In place of feed speed (as a percentage of maximum), the control needs to know feed time (in msec.) and the motion-profile type.
“Most stampers use the sinusoidal profile,” says Gentilia, “gradually ramp- ing up feed speed during the first part of the feed cycle, then ramping down from peek speed at the end of the cycle. But stampers, as they become more familiar with the flexibility and oppor- tunities afforded by servo presses, will realize some definite opportunities to use other profiles.
“For example,” Gentilia continues, “a more aggressive motion profile (trian- gular or trapezoidal) will allow higher run rates or other applications where there’s minimal time to index. And the added acceleration with these profiles also can help if you want to kick the part off the end of the die.”
Ramp up the Dialogue
Coe’s controls engineering manager Bruce Grant notes that the firm has installed a handful of its ServoMaster feeds onto servo presses in the last few
years, and says that the time is now for stampers, press builders and feed suppliers to ramp up the dialogue on servo-press applications. Including gaining some understanding of how the presses will be used in the future. “This is a major shift in the process that affects everything going on under the ram,” Grant says. “We have several servo-press projects underway for the second half of 2012 and into 2013,
many of which we are addressing with our standard servo-feed control. But for the larger transfer-press applica- tions, we’re going with a more flexible controls package—PLC-based with motion-drive networked packages cus- tomized to the feed-line automation and indexing process.
“The challenge going forward,” Grant continues, “is how do we build into these projects the ability to index the material
The COE Code
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