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Shearing

Shearing. Shearing. Punch and die Ratio of rough area:burnished area increases with higher ductility Punch travel depends on the ductility or brittleness. A brittle metal requires little travel. Punch Force. Punch Force = shear strength * cross-sectional area. Friction can affect this.

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Shearing

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  1. Shearing

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

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

  4. http://www.transvalor.com/index.php?rub=52&mo=3&so=63&sso=52

  5. Shearing Operation • Punching – slug is discarded • Blanking – slug is retained • Fine blanking • Slitting

  6. 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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