How to calculate the tonnage for a punch press

Written by andy pasquesi
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In metalworking, a punch press refers to any device that cuts holes into a sheet of material. While hand-operated models still exist, punch presses commonly employ automated computer-numerical control (CNC) systems coupled will hydraulic pistons capable of a generating hundreds of tons of force. To determine the force or tonnage that a press's hydraulic system must exert in order to cut metal with a particular die, you need to consider shear strength and thickness of the metal as well as the circumference or perimeter of the die.

Skill level:
Easy

Things you need

• Measuring tape (ribbon-style)

Instructions

1. 1

Determine the material factor for the target sheet metal material (see Resources).

2. 2

Measure the entire perimeter of the die in millimetres with the measuring tape.

3. 3

Measure the thickness of the target sheet metal in millimetres.

4. 4

Determine the shear factor for the surface of the die (see Resources).

5. 5

Multiply the material factor by the die's perimeter.

6. 6

Multiply the result from Step 5 by the sheet metal's thickness.

7. 7

Multiply the result from Step 6 by the die's shear factor. This will give you the force required by the punch press, in kilonewtons (kN).

8. 8

Multiply the result from Step 7 by 0.102 to convert its units from kilonewtons to metric tons.

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