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Anonymous Poster

mechanical engineering

06/27/2010 12:59 AM

what is the calculating method to arrive at the tonnage required to punch a hole of size 20 mm dia in a hydraulic press? will it be different for a mechanical press? similarly hpw to calculate the capacity of a press for regular punching jobs?
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Unredundant
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#1

Re: mechanical engineering

06/27/2010 1:28 AM

What material?

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muruga prasad
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#4
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Re: mechanical engineering

06/27/2010 2:16 AM

steel is the material used
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Unredundant
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#2

Re: mechanical engineering

06/27/2010 1:29 AM

Next question:

Material thickness?

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muruga prasad
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#5
In reply to #2

Re: mechanical engineering

06/27/2010 2:17 AM

thickness of the material is 6 mm.
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Tornado
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#3

Re: mechanical engineering

06/27/2010 1:42 AM

Shear strength of material ÷ (perimeter of hole × thickness of material), using consistent units.

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kvsridhar
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#8
In reply to #3

Re: mechanical engineering

06/27/2010 7:26 AM

Pardon me .. i was under the impression that it is

Force = Shear Strength X perimeter X thickness ?

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Tornado
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#10
In reply to #8

Re: mechanical engineering

06/27/2010 2:25 PM

Thanks for correcting me. I don't know how I made that slip.

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phoenix911
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#11
In reply to #10

Re: mechanical engineering

06/27/2010 2:43 PM

I don't know how I made that slip.

Look at the time you posted it, maybe that had something to do with it.

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#12
In reply to #10

Re: mechanical engineering

06/28/2010 8:59 AM

It's Vader.

He got me with a Jedi Mind trick the other day (he tricked me into saying gasoline sells for $1.55/gallon)... he seems to be on a spree.

I think you make his recent victim count ten, perhaps eleven.

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#6

Re: mechanical engineering

06/27/2010 2:23 AM

For a hydraulic press, the force exerted is internal cross-sectional area of cylinder(s) × pressure of hydraulic fluid. For a mechanical press, you have to analyze levers and forces, and inertial effects of parts tha move and stop quickly. That depends on lots of detail.

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kvsridhar
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#7

Re: mechanical engineering

06/27/2010 7:24 AM

Your query seems to have been adequately answered, still ... here is a link to help (as long as you can convert mm to inches)

http://www.anvilfire.com/21centbs/math/punching_steel.htm

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phoenix911
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#9
In reply to #7

Re: mechanical engineering

06/27/2010 9:03 AM

Don't forget the tolerances for the clearance between the punch and die

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