Punching Force Calculator

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Punching Force Calculator:

Enter the values of Perimeter, P(mm), Thickness, T(mm), and Shear Strength, SS(N/mm2) to determine the value of Punching Force, PF(N).

Enter Perimeter: mm
Enter Thickness: mm
Enter Shear Strength: N/mm2
   
Result – Punching Force: N

Punching Force:

Punching Force is the mechanical force required to shear or cut a hole in a sheet or metal plate using a punch and die.It is a key factor in metal fabrication processes like blanking, piercing, and forming.

When a punch applies pressure to a material, it overcomes the shear strength of the material and creates a hole.The efficiency and safety of punching operations depend on accurately calculating this required force.

Punching Force depends on three parameters: the Perimeter (P) of the cut, the Thickness (T) of the material, and the Shear Strength (SS) of the material.The Perimeter (P) is the total boundary length of the hole shape (e.g., for a circle, P = π × D).The Thickness (T) is the vertical depth of the sheet being punched.

Shear Strength (SS) refers to the highest internal force a material can resist before it fractures along its plane.Punching Force (PF) is measured in Newtons (N) or kilonewtons (kN), while Shear Strength (SS) is commonly expressed in Newtons per square millimeter (N/mm2).

Materials with higher tensile resistance or increased thickness demand more force to be effectively pierced.Using correct PF ensures tool durability, quality output, and energy efficiency.

Underestimating PF can cause poor cuts or tool damage, while overestimating wastes energy.In industry, calculating PF helps select the correct press machine and tooling.Proper lubrication and maintenance can also reduce required force.Therefore, knowing the PF is essential for safe, precise, and economical punching operations.

Punching Force, PF(N) in Newtons equals Perimeter of the cut, P(mm) in millimetres, multiplied by Thickness of the material, T(mm) in millimetres, multiplied by Shear Strength of the material, SS(N/mm2) in Newtons per millimetre square.

Punching Force, PF(N)= P(mm) * T(mm)* SS(N/mm2)

PF(N)= punching force in Newtons, N.

P(mm) = perimeter in millimetres, mm.

T(mm)= thickness in millimetres, mm.

SS(N/mm2)= shear strength in Newtons per millimetre square, N/mm2.

Punching Force Calculation:

  1. A round hole of 78.5 mm of perimeter is punched in a 6 mm thick copper sheet. If the shear strength of copper is 300 N/mm2, calculate the Punching Force.

Given: P(mm) = 78.5mm, T(mm)= 6mm, SS(N/mm2)= 300N/mm2.

Punching Force, PF(N)= P(mm) * T(mm)* SS(N/mm2)

PF(N)= 78.5 * 6 * 300

PF(N)= 141300N.

  1. A punching machine applies a force of 100,000 N andperimeter of 140mmto rectangular hole in a 4 mm thick metal sheet. Find the material’s shear strength.

Given: P(mm) = 140mm, T(mm)= 4mm, PF(N)= 100000N.

Punching Force, PF(N)= P(mm) * T(mm)* SS(N/mm2)

SS(N/mm2)= PF(N)/ P(mm) * T(mm)

SS(N/mm2)= 100000 / 140 * 4

SS(N/mm2)= 178.57N/mm2.

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