AP&T Servohydraulic Press Decreases Energy Consumption

September 30, 2021

Transfer applications, press hardening, hot forming of aluminum and forming of composite material—with its servohydraulic press, AP&T reports that the servo motor technology is reducing energy consumption by 40 to 70 percent, depending on the application. 

APT_Servohydraulic_Press_Transfer_webSays Mikael Karlsson, product manager of presses at AP&T: “The press’ cushion cylinder is operated by servo motors which work as generators.

Braking energy is distributed to the motors used for acceleration and forming through a kinetic storage system and a central direct-current converter. Since the energy is stored internally in the press, it is not necessary to use electricity from the grid during peak loads. Stored energy surpluses can be restored to the grid.” 

The press hydraulic system’s control valves have been replaced by servo motors so that speed, position and press force are completely controlled electrically. 

“This design,” adds Karlsson, “has made it possible to limit the number of unique moving parts, minimize oil volume, reduce pressure in the hydraulic system to a maximum of 250 bar, and eliminate the effects of any variations in oil temperature.” 

Finally, the press includes closed-loop monitoring and control, directing slide movement and correcting for any deviations to precisely control speed and position and actively govern slide parallelism.

“To maximize production capacity, the press can be synchronized with other servo-driven units for feeding and unloading,” says Karlsson.

Applications for the press include:

  • Transfer solutions: High stroke rate compensates off-center loads and offers full synchronization.
  • Deep drawing and other cold forming: High degree of control accuracy, pre-acceleration of cushion, pulsating forming and major energy savings.
  • Forming of high-strength steel: All forming in one step, with reduced springback. 
  • Hot forming of aluminum: Minimal energy consumption at long holding times and high force, short cycle time and high forming speed.
  • Press hardening: Minimal energy consumption at long holding times and high force. 
  • Lead press in tandem lines: Short cycle time for the entire line, full synchronization, flexible power/stroke length through the entire press cycle.
Industry-Related Terms: Drawing, Forming, Lines, Stroke, Transfer
View Glossary of Metalforming Terms


See also: AP&T North America Inc.

Technologies: Stamping Presses


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