100 Ton Press Brake Build - Vevor Cylinders and Pump - Part 2 - Overview And Intro To Hydraulics
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- เผยแพร่เมื่อ 7 ก.ย. 2024
- In the first part of this video, I show the press itself and some of, what I consider to be, it's weaknesses. Overall the design is ok, but I think I can make it really great.
In the second part I talk a bit about basic hydraulic principle, dangers, and how I considered them in building a high pressure manifold capable of surviving the 10,000 PSI supplied by the pump.
I've noticed a bit more "thumbs down" than usual on my videos. If you did "thumbs down" my video would you mind commenting on why so I can improve them in the future?
Show the build, I do not want to hear you talk so much!
Thank you for your feedback and I do understand. But I did want to make sure to go in-depth on this one as a lot of people are not familiar with hydraulics beyond the use of a bottle jack. I hope you did find value in the series though.
Very good information - Thumbs up!
Thank you very much!
Enjoyed watching all the videos on the press build! Especially this one on hydraulics! I built a press using two 20 ton cylinders and a air over hydraulic pump from vevor and plumbed it in the same way you did here and one of my cylinders presses faster and with more force than the other one making my press not bend square. Is there a way to synchronize the cylinders? I’m learning hydraulics this is the first thing I’ve ever built including them in the project. Thanks
Thank you for commenting and I'm glad you are enjoying the series. I'll start this by saying that I am not a hydraulic engineer, anything stated here is based on my personal observations, experiments and research.
There are ways to sync hydraulic cylinders, but none of them are cheap or easy. There are electronic methods, hydraulic methods and even a couple mechanical ones. It's a lot to get into in a reply to try and describe them all so I'd say google them and we can chat more once you have a basic understanding. However, this is likely not the key to your problem.
Do you have 1 AOH pump or is it one per cylinder? If it is 1 per cylinder, you will have a hard time getting them to sync up as no 2 AOH pumps are exactly the same speed.
If you have only 1 pump, and a "T" in the line as mine is, the difference in speed should not matter too much as they will equalize when they meet resistance. However, if they have different force, that is another issue (which it sounds like may be the case for you). If you have a smaller line or any other restriction anywhere in the system, you may experience issues like you describe. If one is running slower, due to a restriction, the faster one will develop pressure first as the second one has not yet met resistance (or equal resistance). Depending on what you are bending it could crush the higher pressure side before the lower pressure side 'caught up' and developed full pressure.
Also, if you have air in one of the cylinders, you will also get the situation you describe as you will lose force. Hydraulics depend on the fact that fluids cannot be compressed, but air can. So, the cylinder with no air will develop full force, one will air will develop less force as the air compresses and reduces the force. This still should equalize, but depending on your hydraulic plumbing it may be problematic. If you notice, i mounted my rams upside down, this was to place the fittings at the top so that if air did get in, it would get automatically purged when they retracted.
It would be great if you could make a video of your setup and the issue, I would love to see what you built and offer some more insight, but without knowing the entire setup it's pretty hard to narrow it down.
Why are you using 10000psi hydraulics over 3000? I’m guessing it gives you more control
I'll start with the obvious first, the cylinders I used are designed to use a 10Kpsi pump.
Now what I'm about to say is generic, I am not a hydraulic engineer, but this is the high level explanation.
Without getting into too much hydraulic theory, if you were to try to get the same force from the rams using a 3Kpsi pump, the rams would need to be about 3 times the size (in internal square inches).
This has to do with how hydraulics work, PSI is pounds per square inch. So, if a given cylinder is rated at 50 Ton and was designed to use a 10Kpsi supply, it would never be able to achieve 50 Tons of force if it were driven by a 3Kpsi pump as the "pounds of force per square inch" would be lower.