Shearing

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Shearing
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Shearing

• Punch and die
• Ratio of rough areaburnished area increases with
  higher ductility
• Punch travel depends on the ductility or
  brittleness.
• A brittle metal requires little travel.

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Punch Force

• Punch Force shear strength cross-sectional
  area.
• Friction can affect this.
• P 0.7 (UTS) (t) (L)

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Shearing Operation

• Punching slug is discarded
• Blanking slug is retained
• Fine blanking
• Slitting

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Shearing Dies

• Clearance usually between 2 and 8 of the shear
  thickness.
• Compound dies
• Several operations on the same strip may be
  performed in one stroke.
• Progressive dies
• Multiple operation are carried out as the coil is
  moved after each stroke.

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