Deep Drawing Calculators

BySam Zhang

Deep Drawing Calculators

Three quick tools for DFM review: press tonnage, blank size with draw ratio, and blank weight — using AUNOV measured limiting draw ratios.

Direct answer: Use press tonnage to size the press (blanking force plus drawing force, times a safety factor), blank diameter to check the draw ratio against the material’s limiting draw ratio (LDR), and blank weight to estimate material cost. AUNOV’s measured LDRs are 2.1–2.2 for DC04, 1.85–2.05 for 304 and 1.80–1.95 for 5052.

1. Press tonnage calculator

Enter values and click calculate.
Blanking force F = π·D0·t·τ; drawing force uses a simplified Siebel estimate F = π·d·t·Rm·1.5. Values are indicative — confirm with AUNOV for production tooling.

2. Blank size & draw ratio calculator

Enter values and click calculate.
Cylindrical cup with flat bottom: D = √(d² + 4dh − 1.72dr). Draw ratio = D/d; compare with the material’s LDR to see whether one draw is enough.

3. Material weight calculator

Enter values and click calculate.
Weight = π×(D/2)²×t×ρ. Densities (g/cm³): DC04 7.85, 304 7.93, 5052 2.70, brass 8.50, copper 8.96. Use it to estimate material cost per 1,000 parts.

Looking for draw force and limiting draw ratio from geometry? Use the deep drawing force & LDR calculator.

Frequently asked questions

How do you calculate press tonnage for deep drawing?

Direct answer: Estimate the blanking force (perimeter × thickness × shear strength) and the drawing force (π × cup diameter × thickness × tensile strength × a factor of about 1.5), take the larger, and multiply by a safety factor (typically 1.3). Convert newtons to tonnes by dividing by about 9,807.

How do I calculate the blank diameter for a deep drawn cup?

Direct answer: For a cylindrical cup with a flat bottom, the blank diameter is D = √(d² + 4dh − 1.72dr), where d is cup diameter, h is height and r is the bottom corner radius. Then divide D by d to get the draw ratio and compare it with the material’s limiting draw ratio.

How much does a deep drawn blank weigh?

Direct answer: Blank weight is π × (D/2)² × t × ρ, with D and t in the same length unit and ρ the material density. For a 1.0 mm thick, 80 mm DC04 blank the weight is about 39 g; multiply by your order quantity for total material weight.

Need the numbers checked against a real tool?

Send the drawing and material — AUNOV returns a DFM review and a quote within 24 hours.

Request a quote

Standards Behind the Numbers

The formulas and limits in our tools are anchored to the material properties measured by the standards below. We validate each tool result against a trial draw on the real material.

  • ASTM E646 — Standard Test Method for Tensile Strain-Hardening Exponents (n) of Metallic Sheet Materials. The n-value sets how much a wall can thin before necking.
  • ASTM E517 — Standard Test Method for Plastic Strain Ratio (r) of Sheet Metal. The r-value predicts earing in drawn cups.
  • DIN 8584 — Manufacturing processes, forming: classification of deep drawing operations and their subgroups.
  • ISO 20482 — Metallic materials: Erichsen cupping test, a formability measure complementary to LDR.
  • Wikipedia: Anisotropy — explains the r-value and why earing directions form.

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