OT: Need help finding part # - OKK machine

Hey guys, hope you are doing well. I have been searching for this part for over a month, but I cannot find. It's on our OKK machining center, its part of the hydraulic clamping / un-clamping system. I have contacted OKK and two of our distributors, but neither have any idea. I cannot find it on our spare parts list or hydraulic prints. The part # is wiped off the product. Does anyone in the world have any clue what this part # is? Thanks!!!

edit: also I've googled "clamping solutions" but did not find any company that sells these hydraulic compensators under that name?

Does it have an inflation valve on top? similar to a tire valve?

If it is true then it is a hydraulic accumulator and you could change it for another standard accumulator of a similar capacity.

It only remains to know at what pressure it should be inflated, I recommend that it will be about half the normal working pressure.

The accumulator is usually ordered indicating the pressure, then they inflate it with nitrogen.

The accumulator serves to maintain the clamp pressure and force even when the pump is stopped.


Cross-sectional views of typical of bladder and piston-type accumulators. Click on image for larger view.

According to the WaybackMachine, looks like the company went out of business sometime in 2015. No part numbers available in the archives. I would concur that it's some kind of accumulator.

Yep, they are gone:

http://www.illinoiscorporates.com/corp/9380.html

Maybe, if you are REALLY lucky, you could search out the guy listed on this website and see if he can help. Don't hold your breath too long, though.

Keith

looks like a hydraulic bladder.
it has an air bladder inside and when the hydraulic pressure due to a cylinder bottoming out, the bladder is compressed by the hydraulic fluid so the hoses don't burst.


I could be totally wrong. I don't know what the device is connected to.
james

Yes accumulator is more correct term, I called it compensator, my bad. Okay, I will figure the capacity we need and go from there. Does anyone recommend any great websites to find these accumulators? I will start with some google searches, but if you have any positive experience with a particular manufacturer / distributor, please share. Thanks!!!

Here in Europe a brand of accumulators that you see often is Olaer

There are so many capacities, shapes, pressures, etc., better to consult a hydraulic specialist in your area

Good morning, I am still not having any luck finding a suitable replacement for my accumulator. All the ones I found on google are 10 inches long and minimum. The one I have is 5 inches long and about 1.5" in diameter. Does anyone recommend any vendors I can call to come in and take a look at my application? Thanks, have a great day!!!

I would think just about any hydraulic supply house in your area would have a technical group that could come in and take a look at this thing and give you some ideas. If it is an accumulator (which it looks to be) the three big things to worry about are working volume, precharge pressure and maximum pressure. Working volume and maximum pressure will be pretty easy to figure out. Precharge may be a bit harder.

Why are you looking for a replacement? What is the machine doing to make you think the thing is junk? If it really is toast then figuring out precharge will be pretty difficult.

Keith

By the way, this link shows what you are likely trying to accomplish with the accumulator:

https://www.harsle.com/Application-...lamping-system-of-machine-tool-id3781185.html

Maybe these guys can point you in a direction.

Keith

I'm guessing our max pressure is 5k psi, as the gauge next to it goes up to 5k. I am unsure what the working volume / pre-charge pressure might be as it is wiped off the current one on the machine.

At the moment, the machine is running okay, but sometimes the clamping / unclamping becomes slow every now and then. The accumulator should make up for this issue, but sometimes it does not, so I thought to replace it and see if the issue would go away.

However, when you sent me the link over a month ago, I learned that the company "clamping solutions" had dissolved; I googled the owner and found some phone #s, but none got me in touch with him.

So I contacted my distributor and OEM to find me a good replacement, but they don't know either, so I'm working to find another solution. I had bought one from Grainger, but it was too heavy and big for our application, so I found one on McMaster (diaphragm accumulator), so I will try that one out when it arrives. I'll check out the 2nd link you sent me as well, thanks for that kamenges.

My guess is that the accumulator in your application is intended to provide holding pressure with the motor turned off. This assumes your motor does turn off after the clamps get into position. That accumulator is so small that I don't think it would be capable of helping much with speed unless your clamp cylinders are about the same size as the accumulator.

Keith

Don't know if you have found a replacement yet, but it looks like a piston accumultor. Parker may have a substitute.


https://www.parker.com/Literature/A...ndycroft/ACDE Accumulator Range_HY10-4048.pdf

bill6672 said:

Don't know if you have found a replacement yet, but it looks like a piston accumultor. Parker may have a substitute.


https://www.parker.com/Literature/A...ndycroft/ACDE Accumulator Range_HY10-4048.pdf

Click to expand...

@bill6672 Thanks, I looked on parkers website initially, but did not find a good one; but the link you sent had loads of them similar in design to the one I have, so I have ordered one and we will try it out and see how it works. Thanks man!

I found a good diaphragm accumulator on McMaster, this one is pre-charged to 1000 PSI using dry nitrogen with a max pressure of 3,000 PSI.

Using the diaphragm accumulator, When we applied hydraulic fluid into our fixture at 2,000 PSI to clamp the part, I noticed the accumulator pressure quickly jumped to 1000 PSI, then slowly worked it's way to 2,000. Once it reaches 2k, our operator unplugs the hydraulic line and cycles the part.

Compared to the original piston accumulator from my first post, the piston gradually increments up about 500 PSI every time until it reaches 2,000 and about 10-15 seconds faster than the diaphragm.

Is it correct for me to increase the pre-charge fluid in my diaphragm to 1,600 to make it work faster, or will this break the accumulator? My only understanding and experience of accumulators is from this website.

There's a nice photo on the website showing that diaphragms are slower in general than pistons, so I am thinking increasing the pre-charge will not make the clamps work faster, but wanted to confirm with someone more experienced.