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Mechanical knowledge

Sheet metal forming calculation

Diagram divided into sections showing formulas and illustrations for sheet metal forming. Left side depicts circular punch and die with diameters Dp and Dh height h and area A calculated as difference of squares times pi over four. Middle section illustrates draw ratio Dr as Dh over Dp draw clearance c and limiting draw ratio LDR as one over pi times natural log of Dh over Dh. Right side shows punch force F as Dp times Do minus Dh over Dh times draw ratio and parameters list including blank diameter punch diameter sheet thickness ultimate tensile strength bend length bend radius draw ratio draw clearance and limiting draw ratio. Bottom sections cover draw reduction percentage as (Dh minus Dp) over Dp times 100 percent and bend with radius r force F as sigma u times t times L over R.

7:56 PM · Oct 29, 2025

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