DUNKES – high-tech from the factory

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  • innovative control concepts
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Deep drawing

The following figures show the operating principles of a die cushion

 

Dual action die cushion function:

 

Blank is clamped between sheet metal hold down and drawing die

1.     Sheet-metal holder
2.     Ram
3.     Die
4.     Hold down
5.     Blank
6.     Drawing die
7.     Ejector
8.     Press table
9.     Centre sleeves

 

 

Ram descends and draws the blank over the die. The blank is clamped and released in a controlled manner in accordance with the displacement force.

 

Ram and die cushion travel upward. The workpiece is detached from the die by the sheet metal hold down and concurrently ejected from the drawing die by the ejector.

 

Triple action die cushion function:

Blank is clamped between sheet metal hold down and drawing die

1.     Sheet-metal holder
2.     Ram
3.     Die
4.     Hold down
5.     Blank
6.     Drawing die
7.     Ejector
8.     Press table

 

 

Ram with die travels down and draws in the blank into the drawing die

 

 

Ram with die travels upward. Workpiece is detached from the die via the holddown. The ejector travels upward concurrently and pushes the workpiece from the drawing die.

 

Synchronous deep drawing

Synchronous drawing with a DUNKES servo lead screw press is recommended for extreme drawing depths.
On a servo lead screw press, the ram and drawing die can be moved in a coordinated phase-shifted rhythm appropriate for the material characteristics, therefore splitting the drawing process into a plurality of small forming operations.

 

In comparison to conventional deep drawing, this process achieves significantly larger deep drawing depths (see following figure).

Other advantages of a servo lead screws include:

  • Servo lead screw presses combine the benefits of mechanical/hydraulic drive technology
  • Highly dynamic reversible drive
  • Very rigid drive system, high precision
  • Max. force available over the entire stroke and speed range
  • The motion profiles are user programmable and controllable to optimise a forming process
  • Very high accuracy due to orientation and position control, including ram parallelism on multi-lead screw operations
  • Completely synchronous motion sequences between ram and die cushion
  • Reduced noise and vibration emission
  • Energy-efficient, high efficiency
  • Intermediate storage ( energy generated during the braking process is stored intermittently and made available to the subsequent energy demand, e.g. during acceleration)
  • Grade reclaim
  • Load peaks are cut off
  • Environmentally compatible (no hydraulic fluid), emission free (excluding noise)
  • Other applications: forming, assembling, joining

The following 3-D figure shows a DUNKES servo lead screw press with 4 server lead screw drives

 

 

 

You can find more information about server lead screw presses at    => Link to servo lead screw presses and product articles