Stripping Force Calculator

If you're working with press tools, sheet metal operations, or thread engagement design, understanding stripping force is crucial. It helps ensure your tool performs safely and efficiently without damage or material failure. That’s why we’ve developed an easy-to-use Stripping Force Calculator built to help engineers, machinists, and students find accurate results without any hassle.

This guide explains what stripping force is, how it works, and how our calculator simplifies the process with 100% accuracy and instant results.

What is Stripping Force?

Stripping force is the amount of force required to separate the workpiece from the die after a cutting or punching operation. In simpler words, after the punch goes through the material, you need extra force to pull it back out that’s the stripping force.

This force is essential in press tool design to avoid tool jamming, increase tool life, and ensure clean cutting or punching results.

How Do You Calculate Stripping Force?

The formula for calculating stripping force in cutting or punching operations is simple and straightforward:

Stripping Force = Cutting Force × (Stripping Percentage / 100)

For example:

If the cutting force is 20,000 N and the stripping percentage is 15%,

then:

Stripping Force = 20000 × (15 / 100) = 3000 N

Usually, the stripping percentage ranges between 10% to 20% of the total cutting force, depending on the material and tool design.

How to Calculate the Stripping Force in Press Tool?

In press tools, the cutting force is the primary factor. Once the tool penetrates the material, you need to apply the stripping force to retract the punch and avoid tool wear.

Here’s the detailed method:

1. Determine Cutting Force: This depends on the shear area and material shear strength.
   Formula:
   Cutting Force = Perimeter × Material Thickness × Shear Strength
2. Apply Stripping Force Formula:
   Once you have the cutting force, multiply it by the stripping percentage.

So,

Stripping Force = (Perimeter × Thickness × Shear Strength) × (Stripping % / 100)

What is Threaded Stripping Force?

In mechanical fasteners, stripping force is also applied to thread engagement. When the screw or bolt is tightened, it can strip the threads if the force exceeds the shear strength of the material.

Formula to calculate stripping force in threaded fasteners:

Stripping Force = 0.5 × π × Pitch Diameter × Engagement Length × Shear Strength

For example:

If pitch diameter = 0.01 m, engagement length = 0.01 m, and shear strength = 300 MPa

then:

Thread Shear Area = 0.5 × π × 0.01 × 0.01 = 1.57 × 10⁻⁴ m²

Stripping Force = 1.57 × 10⁻⁴ × 300,000,000 = 47,100 N

How to Use Our Stripping Force Calculator

We’ve designed this tool to be user-friendly and accurate. Just follow these steps:

For Cutting/Press Tools:

1. Enter the cutting force.
2. Choose the force unit (N, kN, lbf, etc.).
3. Enter the stripping percentage (typically 10–20%).
4. Click Calculate to get the stripping force.

For Threaded Fasteners:

1. Enter the pitch diameter and engagement length.
2. Choose the material or input the shear strength manually.
3. Select proper units (mm, MPa, etc.).
4. Click Calculate and get the result instantly.

Our calculator handles all unit conversions in the background, ensuring accurate and consistent results.

Final Verdict

Whether you're designing a press tool or verifying thread engagement safety, stripping force matters. It protects your tools, materials, and assembly from failure. With our Stripping Force Calculator, you can perform these calculations in seconds without worrying about unit conversions or formula mistakes.

FAQs

What is the standard stripping percentage?

Typically between 10% to 20% of the cutting force, depending on material and die clearance.

Can I use this calculator for thread stripping?

Yes! Our tool supports both cutting operation stripping and threaded fastener stripping.

What units are supported?

It supports N, kN, lbf, kgf for force; mm, cm, in, ft for length; MPa, GPa, psi for shear strength.

Can I enter custom shear strength?

Absolutely. You can select a material or manually enter any custom value.

Is this calculator free to use?

Yes, 100% free, mobile-friendly, and no login required.