Free Engineering Tool

Deep Drawing Force Calculator

Compute the drawing ratio (drawing coefficient) m = d/D, punch force F = π·C₁·d·t·σs with the C₁ table, and recommended die & punch radius (r-angle) setting for cylindrical deep drawn parts.

1 · Units

Metric (mm)Imperial (in)σs in MPaσs in ksi

2 · Blank & Product Dimensions

Drawing ratio m = d / D · Punch force F = π·C₁·t·σs

Blank Diameter (D)

Diameter of the flat circular blank

Product Diameter (d)

Inside or mean diameter of the drawn cup

Sheet Thickness (t)

Tensile Strength (σs)

MPa

Ultimate tensile strength of the sheet material

3 · Die & Punch Radius (r-angle)

Die Radius (r_die)

Optional …"if blank, the recommended range is shown in the result

Punch Radius (r_punch)

Optional …"typical 0.6….0 × r_die

The die radius controls material flow over the die edge …"too small a radius tears the blank (fracture at the die shoulder), too large a radius allows wrinkling and reduces dimensional control. Punch radius mainly affects the stress at the punch nose.

Material Quick Reference

σs is the tensile strength (not shear strength) for deep drawing. Select a material to auto-fill.

Enter the blank diameter D, product diameter d, sheet thickness t and tensile strength σs above …"the drawing ratio and punch force update automatically.

How it works: the drawing ratio m = d/D measures how severe the draw is. For a first draw, metals usually stay between 0.50 and 0.62. The punch force F = π·C₁·t·σs uses the C₁coefficient from the standard table (interpolated), the product diameter, sheet thickness and tensile strength. The blank-holder force is estimated at ≤?25% of the punch force. Add 10–0% safety margin for production conditions.

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Send your drawing to shawn@balford.net — our engineers will confirm material grade, gross weight, machining and pricing within 24 hours.