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stunny
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Join Date: Aug 2011
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Mechanical or Hydraulic Press

09/06/2011 8:30 AM

Hi,

I am working at a Ceramic Factory as an R&D (chemical) engineer. I am intended to change the forming method of insulators by using press for granulars. We have a vintage press and no one knows what kind of press it is. It has not got any piston, although it has a barometer. I want to use diffrent pressures but I have no idea how I am able to change the pressures. ( I need different pressures for different granular sizes) I can send its pictures, if somebody is interested in it.
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TonyS
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#1

Re: Mechanical or Hydraulic Press

09/06/2011 8:46 AM

Send the pictures, if you don't know what it is, how are we supposed to?

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stunny
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#2
In reply to #1

Re: Mechanical or Hydraulic Press

09/06/2011 9:57 AM
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gringogreg
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#13
In reply to #2

Re: Mechanical or Hydraulic Press

09/07/2011 8:27 AM

This looks to me to be a mechanical press equipped with a die cushion below the bolster. The die cushion is used to apply pressure against the blank in a deep drawing die. This press would not be appropriate for your application. Well, on second thought, depending on the pressure that your process requires, it just might work with the right tool design.

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stunny
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#3
In reply to #1

Re: Mechanical or Hydraulic Press

09/06/2011 10:03 AM
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nick name
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#8
In reply to #3

Re: Mechanical or Hydraulic Press

09/06/2011 12:05 PM

After a second look I would suggest that you take off the press all what is not fastened to it and take several pictures from ALL sides. It seems that the right coil I assumed to be a cooler could in fact be a spring. May be the one used to refill the piston.

If we have more picture we can refine the image we get of the machine and give a better estimation.

Any way what I suggested : the schematics of the piping and connected devices is a MUST.
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lyn
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#4

Re: Mechanical or Hydraulic Press

09/06/2011 10:13 AM

You have a mechanical press. It's all or nothing as far as pressure goes, unless you mount the lower half of the tool on some type of cushion or springs.

The mechanism must go through a complete cycle each time.

The only other thing I can suggest is some sort of stop on the stroke mechanism that doesn't allow the drive wheel to rotate through a complete cycle. But, then you have a manual press that will not have a very high production rate. You would also have a problem with repeatability of pressure control.
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#5

Re: Mechanical or Hydraulic Press

09/06/2011 11:01 AM

Looking at the bottom part of the pictures you send I presume that the upper knee presses against a piston which is on a hydraulic cushion. You have to check if the bottom plate moves down when form is pressed. If it is the case then you could, but I do not know yet since I do not know the system of the cushion, modify the pressure against which the upper part is pressed.

It would be recommendable to make several pictures and try to sketch the different pipes and elements of the press. For instance I think that the coil at the right is a cooler for the oil in the cushion. But I cannot be sure. The principle could be as follows:

at no load a spring pushes up the piston and the ram is filled with oil.

when pressed a check valve closes and cut the connection to the reservoir and a pressure relief valve opens and limits the pressure and thus the force. If it is as I presume then you could modify the setting of the pressure relief valve and obtain what pressures you need.

Look also how pressure at the manometers does change during cycle.

The bottle at the right could be a gas spring in fact for the cylinder filling up when not under load.
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lyn
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#7
In reply to #5

Re: Mechanical or Hydraulic Press

09/06/2011 11:55 AM

As usual, I believe that you are correct in your assessment. What you say makes much more sense than my statements.

A GA has been dispatched.

Cheers.
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RVZ717
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#6

Re: Mechanical or Hydraulic Press

09/06/2011 11:13 AM

Personally, I would switch over to a hydraulic press. You can infinitely vary the pressure applied to your product, and control your quality within a very tight margin. Hydraulics are also fairly economical if done correctly.

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vishal sharma
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#9

Re: Mechanical or Hydraulic Press

09/06/2011 12:13 PM

hello frnd,

can u send me the full detail o the project,i am intersted in this .i am a final year student want to make project on this.plz help me i shell be very thankful yo u.......

u send me ur link to CR4 Admin - email address removed

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#10
In reply to #9

Re: Mechanical or Hydraulic Press

09/06/2011 12:41 PM

Youth and exuberance. A positive attitude. I like it; it is refreshing.

It is sometimes a shame that old age and treachery will always prevail.

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regsoft
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#11

Re: Mechanical or Hydraulic Press

09/07/2011 12:26 AM

I suspect nick name is correct and added a good answer vote. I also see a crank at the top of the coil. Can we get more pictures of that? It looks like it could be an adjustment of some sort. Maybe for the relief valve setting? Or is that a spring and that sets the pretension for the anvil?

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stunny
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#12

Re: Mechanical or Hydraulic Press

09/07/2011 3:24 AM

Thank you for all answers and comments. I will send more pictures and a video of the machine to show how it works, maybe this is more helpful to understand the system of each part.
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Users who posted comments:

Doorman (1); gringogreg (1); lyn (2); nick name (2); regsoft (1); RVZ717 (1); stunny (3); TonyS (1); vishal sharma (1)

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