Page 23 - MetalForming April 2012

• Programmability of all of the above-mentioned parameters.
• Full press capacity near stroke BDC.
• Generally greater cycle speeds than a hydraulic press, in many
cases approaching the speed of a traditional mechanical press.
• High accuracy and repeatability.
• Relatively high initial cost.
Shown are examples of stroke profiles and parts that can be achieved with a servo press.
Compound Pressing and Forging
Deep Drawing
General Forging
Two Types of Servo-Drive Systems
Metalformers can select from two
types of servo-press drive
technologies. A link-assisted drive
system provides a cost-effective
solution that utilizes standard, off-
the-shelf AC servo motors. A link or
toggle mechanism coupled with the
motors creates mechanical ratios
that allow use of standard motor
sizes from proven motor and control
suppliers. No proprietary motors or motor controllers are required.
A direct-drive system employs proprietary, high-torque low-rpm motors specifically designed for press applications. These motors replace the standard motor, flywheel and clutch/brake in an otherwise traditional crankshaft-style mechanical press.
Regardless of drive type, servo presses will run from a proprietary control designed to allow for the wide variety of stroke and slide-movement profiles possible, while supplying full working energy even at low speeds. Unique profiles can be created by the user; each profile can include:
Perforation/ Blanking
Warm Forming
• Cycle
• Swing
• Multipass
• Simulation of link motion
• Compound pressing and forging
• Deep drawing and general forming
• Perforation/blanking
• Warm forming
With full working energy available at any
speed and the ability to dwell anywhere in the stroke, servo presses are taking a big bite out of the drawn-and-formed parts pie. However, servos still are mechanical presses at heart, and achieve full tonnage capacity near the bottom of the stroke. So, hydraulic presses—with full tonnage and energy through-out the entire stroke—still offer an advantage in many applications. MF
Get more info at: Stamtec
4160 Hillsboro Highway Manchester, TN 37355 Tel: 931/393-5050 www.stamtec.com
www.metalformingmagazine.com MetalForming/April 2012 21