1. What is a Metal Stamping Tonnage Calculator?

Definition: This calculator estimates the required press tonnage for metal stamping operations based on material properties and geometry.

Purpose: It helps manufacturers and engineers determine the appropriate press size needed for punching or blanking operations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Required tonnage (tons)
• \( P \) — Perimeter of stamp (inches)
• \( t \) — Material thickness (inches)
• \( S \) — Shear strength of material (psi)

Explanation: The formula calculates the force needed to shear the material by multiplying the cut length (perimeter) by thickness and material strength, then converting to tons.

3. Importance of Tonnage Calculation

Details: Accurate tonnage estimation ensures proper press selection, prevents equipment damage, and maintains product quality in metal stamping operations.

4. Using the Calculator

Tips: Enter the stamp perimeter in inches, material thickness in inches, and shear strength (default 45,000 psi for mild steel). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the 2000 divisor for?
A: It converts pounds-force (result of P×t×S) to tons (2000 lbs = 1 ton).

Q2: What's a typical shear strength for common metals?
A: Mild steel ~45,000 psi, stainless steel ~65,000 psi, aluminum ~25,000 psi.

Q3: How do I measure perimeter for complex shapes?
A: Sum all straight segments and curve lengths around the cutting edge.

Q4: Should I add a safety factor?
A: Yes, consider adding 20-30% to account for tool wear and material variations.

Q5: Does this work for progressive dies?
A: Yes, but calculate tonnage for all simultaneous operations and sum them.