Page 23 - MetalForming Magazine October 2022 - FABTECH
P. 23

THE CASE FOR
  SERVOHYDRAULIC PRESSES
Servohydraulic presses incorporate servo motors for precise control of various press functions while reducing the need for hydraulic components, which can be main- tenance-heavy. Remaining hydraulic com- ponents have been optimized as well. Pho- tos courtesy of Sutherland Presses.
 High force, precision stroke control, energy savings and more make servohydraulic presses an efficient and effective choice across a range of applications.
BY LOUIS A. KREN, SENIOR EDITOR
When it comes to servo press parts as a regular motor: stator and provide precise forming action—and
rotor. The addition of servo technol- ogy, with the servo device as an actu- ator—linear or rotary—provides posi- tioning via a signal. In simple terms, the motor responds quickly to the servo signal, enabling rapid acceler- ation. A servo motor, combining posi- tion signaling and rotational power, enables precise control of position velocity and acceleration.
In a servohydraulic stamping press, servo motors tied to ram movement and valve operation—and, in some cases, for ram control in press cush- ions—allow for precisely dialed-in set- tings for each application, considering the overall job as well as tooling and material. Using press controls, stam- pers can program stroke movement and force anywhere in the stroke to
technology, servomechanical
models receive the lion’s share of attention. But within that con- versation, admittedly to a smaller degree, are servohydraulic presses. To makers and users of servohydraulic presses, benefits are many, and these workhorses can hold their own on the shop floor. Providers—Sutherland Presses, Greenerd, AP&T, Macrodyne and others—have spent the past decade refining technology to bring effective servohydraulic presses to the North American market, and here we present the advantages that these
providers tout.
Why Servo Motors?
Without diving into the weeds, servo motors have the same basic
dwell time as needed. This capability makes servo-driven presses extremely flexible, and quite energy-efficient due to the tailored power.
Traditionally, mechanical and hydraulic presses each have offered specific benefits, with mechanicals pro- viding higher stroke speed, simpler set up and maintenance, and high repeata- bility. Hydraulic presses deliver full energy throughout the press stroke along with freely programmable slide motion and energy control. Introduc- ing servo motors into the hydraulic- press equation retains the stated advantages, with plenty more added.
Reduces Complexity of Hydraulics
Incorporating servo motors in
20 MetalForming/October 2022
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