How does a hydraulic ram make 180000 tons of force

[Leejohn]

What size pins would be needed?

 

[IceStationZebra]

Power density is one of the benefits of hydraulics. At work we get large instrumented pins made thru a supplier, which are then sent to Lehigh University to perform the calibrations on their 5,000,000 lbs universal tester. http://library.lehigh.edu/omeka/exhibits/show/jfl/butm/tm

If you want an interesting read google "heavy press program." Part of the program included the construction of two 50,000 ton presses. The Mesta/Alcoa press was totally rebuilt a couple years back and there are some good articles on it. It only operates at 4500psi by the way. History in the Making
https://www.asme.org/wwwasmeorg/med...1-ALCOA-50000-ton-Hydraulic-Forging-Press.pdf

ISZ

 

[bcp]

This video on making pressure tanks says "up to 800 tons" at about 1:06 into it.

https://www.youtube.com/watch?v=Z0L9BO02cZs

Bruce

 

[smilinjak]

Do the math. Piston area is ｽ the diameter squared (d/2 x d/2) x pi (22/7 or 3.1417XXXXXXX) x pressure in pounds per square inch yields pounds of force.

180,000 tons is 3.6x exp8 (natural logs) = 2500 psig (for a number for pressure in psig) x area of piston.

Transposing, area of piston = 18000 tons/2500 = 1.44 exp5.

Diving by pi 1.44 exp5/3.14 = ｽ dia squared (radius squared) = 4.6 exp4 inches (since values are in #/ in squared).

Solving for the diameter in inches = square root of 4.6 exp4 = 2141 x 2 = 4283/12 = a diameter of 35'.

,,,,,,,,nothing else to do this evening :cool2:

I understand all the math, can do it in my head, not. The DIVING by Pi has me a bit confused, swan, jack knife ,,, what kind do you recommend ?
Smilinjak

 

[npalen]

Interesting stuff for sure!

 

[woodlandfarms]

yeah guys, sorry, on the tonnage. but in the end 8000 800 80 it still blows my mind so little (in my head) can do so much. Thanks for all the insight and links, lots of reading for sure.

 

[SPYDERLK]

yeah guys, sorry, on the tonnage. but in the end 8000 800 80 it still blows my mind so little (in my head) can do so much. Thanks for all the insight and links, lots of reading for sure.

Yes, the huge forces are mind boggling, but with hydraulics it comes down to area and pressure and special contrivances to bring them to bear. The high forces, even in the 100s of tons rely on use of multiple cyls applied in pull mode driving a guided platen. In the thousands of tons this becomes the only way physically possible within the strength of materials.

 

[Texasmark]

I understand all the math, can do it in my head, not. The DIVING by Pi has me a bit confused, swan, jack knife ,,, what kind do you recommend ?
Smilinjak

Since area of the piston surface is defined as radius squared x pi, if you are looking for the diameter (aka 2x radius) you have to get the pi out of the area and multiply the radius by the 2.

 

[k0ua]

Pie? did someone offer pie?... I like most any kind..:laughing: I think someone said something about pie are square... but most I have seen are round?:confused3: I know this much about an 800 ton press... It sure as heck would squish your finger real good..

And diving by pie? I have been know to dive into a pie or two in in my time... and I have the gut to prove it!

 

[Furu]

You want to blow your mind. Look at the force that is translated by women in their daily walk-abouts in the fashion industry.
Calculate the PSI of the 3/8 inch diameter spike high heels that women wear that is translated to the surface they walk on. Especially if they rock/shift their weight back.