Force needed for hole punch in Metal

In summary, the conversation discusses using a punch to create a circular hole with a diameter of 35 mm in a 0.2 cm thick metal sheet. The shear strength of the metal is given as 80 MPa and the task is to estimate the force needed for punching. The equations and theories relevant to this problem are listed, including Hooke's Law, modulus of elasticity, tension and compression, stress-strain relations, elastic limit, and ultimate strength. It is suggested to do a search using the keywords "punch + hole + shear" to find the solution to this problem.
  • #1
SpiraRoam
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Homework Statement


A punch is used for cutting an (approximately) circular hole with a diameter of 35 mm through a metal sheet 0.2 cm thick. If the shear strength of the metal is 80 MPa, estimate the force needed to punch the hole. Make it clear how you have calculated this value.

Homework Equations


Unsure...

The Attempt at a Solution


I know this is properties of solid materials but would it be Hooke’s Law, modulus of elasticity; tension and compression; stress-strain relations for longitudinal and shear stress; elastic limit; ultimate strength; comparison of metals, polymers and ceramics as engineering materials in relation to density, strength, thermal, electrical or magnetic properties?

I think ultimate strength and comparison of metals with perhaps stress / strain relevance also?
 
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  • #2
This problem is trivial and the background theory and the actual solution can easily be found online .

Have you tried doing a search using the keywords " punch + hole + shear " ?
 

1. What is the force needed for a hole punch in metal?

The amount of force needed for a hole punch in metal depends on several factors such as the thickness and hardness of the metal, the size of the hole, and the type of hole punch being used. Generally, it can range from a few pounds to several hundred pounds of force.

2. How do I calculate the force needed for a specific hole punch in metal?

To calculate the force needed for a specific hole punch in metal, you can use the following formula: Force = Pressure x Area. First, determine the pressure required for the type of metal you are punching by consulting a pressure chart. Then, multiply the pressure by the area of the hole punch to get the force needed.

3. Can I use the same amount of force for all types of hole punches in metal?

No, the amount of force needed for a hole punch in metal will vary depending on the type of punch being used. For example, a hand-held manual punch will require less force than a hydraulic punch press. It is important to consult the manufacturer's instructions for the specific punch being used.

4. Does the angle of the punch affect the force needed?

Yes, the angle of the punch can affect the force needed for a hole punch in metal. A punch with a sharper angle will require less force, whereas a punch with a flatter angle will require more force. This is because a sharper angle concentrates the force in a smaller area, making it easier to punch through the metal.

5. Are there any safety precautions to consider when using a hole punch in metal?

Yes, there are several safety precautions to consider when using a hole punch in metal. Always wear protective gear such as gloves and safety glasses. Make sure the metal is securely clamped down to prevent it from moving while punching. And use caution when handling sharp metal edges and disposing of the punched-out pieces.

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