Page 19 - MetalForming November 2015

machines. “Servo-drive technology brings the same reliability as offered by the old, simple mechanical punch presses, perhaps even greater relia- bility. And servo-driven punch press- es retain all the features of hydraulic machines in controllability of the ram for speed and depth, and they run fast.
“As for energy savings,” he contin- ues, “these new punch presses capture some of the power used to activate the ram as the ram is decelerated, and in addition, idle power consumption is practically nil. Given that and other technology improvements, we say that our latest-generation electromechani- cal servo-drive machines consume one-third of the power of our older hydraulic machines”
Hydraulic turret presses also require more intensive maintenance, such as annual oil changes (more than one if the machine runs multiple shifts), with each change needing roughly 40 gal. of high-grade hydraulic oil and filters.
Servo drives, such as one diagrammed here, provide reliability and tight control of ram speed and depth, allowing for rapid, flexible production.
“Oil changes alone can run a few thousand dollars per year, besides maintenance related to pumps, hoses and connections,” says Brady. “All of that went away with the advent of servo
punch presses, which, along with ener- gy savings, plays into the ROI of a machine. In addition, depending on a manufacturer’s location, power com- panies offer rebates, some approaching
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