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Email: shawn@balford.net
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拉深力计算器

计算拉深系数 m = d/D、冲头力 F = π·C₁·d·t·σs（使用C₁表），以及圆柱形拉深件的推荐凹模和冲头圆角半径（r角）设置。

1 · Units
2 · Blank & Product Dimensions
Drawing ratio m = d / D  ·  Punch force F = π·C₁·t·σs
mm
Diameter of the flat circular blank
mm
Inside or mean diameter of the drawn cup
mm
MPa
Ultimate tensile strength of the sheet material
3 · Die & Punch Radius (r-angle)
mm
Optional …"if blank, the recommended range is shown in the result
mm
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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