I finally started to own a hydraulic press

[a smile]

When I have difficulties in the processing of hexagonal or other polygons with inner holes, I think I can try hot stamping. So purchased a car maintenance side of the hydraulic press rack. Nominal 100T, I will not calculate, but I will check the relevant information. Here are some images:

I customized two hydraulic pipes based on the type of joint

As I progressed, I found more questions:



Solenoid valve electromagnet core can not move, probably because after a long time to stop the use of a little stuck, I can only open and clean up, now the valve body is also easy to use.

Another major problem was that the hydraulic cylinder began to leak oil after starting, and the oil leak point came from the hollow inside of the hydraulic push rod, and the specific leak point could not be observed. The final decision was to return the product to the seller and replace a 150T pressure hydraulic press frame.

I hope there are professional hydraulic practitioners here to answer some of my questions: the piston diameter of this hydraulic cylinder is 140mm, and the design input pressure is 50MPA, which is calculated according to my understanding: 7*7*3.14=153.86*500bar=76930/1000=76T. But the nominal pressure of this hydraulic cylinder is: 100T,

Is this my miscalculation? Or the calculation method is wrong? Or is this a nominal error?

 

[matthewsx]

I can’t verify your math but hopefully you get your money back. What is the intended use of this machine?

John

 

[OTmachine]

500 Bar = 7250 psi ~ 50 mpa
where are you getting that kind of pressure from?
cylinder bore is 140 mm
looks like it would require 577 Bar to obtain 100T

 

[a smile]

I can’t verify your math but hopefully you get your money back. What is the intended use of this machine?

John

I have agreed with the seller to replace it with a larger size. I plan to use it to squeeze some specially shaped metal cavities, or externally collide. Of course, the metal needs to be heated to a red and softened state.

 

[a smile]

500 Bar = 7250 psi ~ 50 mpa
where are you getting that kind of pressure from?
cylinder bore is 140 mm
looks like it would require 577 Bar to obtain 100T

Thanks for your calculation, I also obtained some calculation methods from the calculation of other cylinders, which is consistent with yours. It should be the seller's calculation error, which happened to be a wrong grade. The one on the picture should be 75T, and I have replaced it with a larger cylinder.

 

[RJSakowski]

I calculated 86.5t.

 

[a smile]

I calculated 86.5t.

Thank you very much for your calculation. Could you please give me the calculation process? I wish I knew what the difference was! thank you

My calculation result is 78.4T, and the process is as follows: 7*7cm*3.14*50mpa*10.2=78468/1000=78.4T.

 

[RJSakowski]

Thank you very much for your calculation. Could you please give me the calculation process? I wish I knew what the difference was! thank you

My calculation result is 78.4T, and the process is as follows: 7*7cm*3.14*50mpa*10.2=78468/1000=78.4T.

I converted the 140mm bore diameter to 5.512 inches. The radius squared times pi to get 23.86 sq. in. Then I converted the maximum pressure of 50 mPa to 7252 psi with an online calculator and multiplied the product for 173,035 lbs. Divide by 2,000 to get 86.52t.

 

[Firstram]

I converted the 140mm bore diameter to 5.512 inches. The radius squared times pi to get 23.86 sq. in. Then I converted the maximum pressure of 50 mPa to 7252 psi with an online calculator and multiplied the product for 173,035 lbs. Divide by 2,000 to get 86.52t.

Imperial tons vs metric tonnes! 86.52/1.1=78.65

 

[OTmachine]

Imperial tons vs metric tonnes! 86.52/1.1=78.65

Forgot about that ….
Thanks!