Producing with a Trumpf Punch Press

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Producing with a Trumpf Punch Press

• Mike Miller
• Emech 210
• 4-10-02

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Specifications of a Trumpf Model TRUMATIC 500
ROTATION Punch Press

• 220 kN Punching force (49,500 lb)
• Handles up to 8mm thick sheets (5/16 in)
• Linear tool magazine that holds 18 tools
• 121.5 x 65 in working range
• 60 in/sec X-axis travel speed, 40 in/sec Y-axis
  travel speed
• 900 hits per minute high speed punching
• Sorted removal of finished parts
• Light barrier safety fence
• Info from www.trumpf.com

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Pictures of a Trumpf Punch Press
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Pictures of a Trumpf Punch Press
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How it Works

• The hydraulic head rapidly forces the inserted
  punch through the piece.
• The die of just over the size of the punch
  prevents the metal from moving or bending.

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Strength of Materials Reasoning

• Applied shear force over area exceeds the
  materials Ultimate shear strength.
• Ex. 1 in. Circular Punch
• t V / A where V shear force and
  A thickness times
  circumference
• t 49.5 kip / ( 5/16 2p(0.5)) in2
• t 50.4 ksi

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Strength of Materials Reasoning

• The ultimate shear strength for 2014-T6 Aluminum
  is 42 ksi while it is only 27 ksi for 6061T6
  Aluminum
• The applied shear stress has obviously exceeded
  the ultimate shear strength, causing the piece to
  break
• Smaller punches apply larger stresses because of
  the decreased area, this allows for slightly
  thicker plates to be used if necessary
• Punches over 1 in. are angled on the bottom, also
  reducing the area the force is acting over

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Punching Possibilities
Factory Example Piece
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Punching Possibilities
Fancy Range Hoods
Refrigerated Truck Parts
Various Airplane Parts
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For more information
www.trumpf.com