Tonnage Calculator Punching

Punching Tonnage Formula:

\[ T = \frac{P \times t \times S}{2000} \]

Required Tonnage (T):

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1. What is a Punching Tonnage Calculator?

Definition: This calculator estimates the force required for punching operations based on material properties and punch geometry.

Purpose: It helps metal fabricators determine the appropriate press brake tonnage needed for punching operations.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ T = \frac{P \times t \times S}{2000} \]

Where:

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

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

3. Importance of Punching Tonnage Calculation

Details: Accurate tonnage calculation ensures proper press selection, prevents machine overload, and maintains tooling life.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: How do I calculate punch perimeter?
A: For round punches: π × diameter. For other shapes, sum all side lengths.

Q2: What's typical shear strength for common materials?
A: Mild steel: 45,000 psi; Stainless: 52,000 psi; Aluminum: 32,000 psi.

Q3: Why divide by 2000 in the formula?
A: This converts pounds to tons (1 ton = 2000 lbs).

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

Q5: Does this work for all punch shapes?
A: Yes, as long as you accurately calculate the perimeter of the punch shape.