[TheForge] Hydraulic Press Control

Sun Feb 3 14:55:43 2002

Hey Ed,
I haven't received the  UMBA tape yet, so I'm not clear as to the advantage
of using an automatic repeat cycle on a hydraulic press. The press works so
much more slowly than a power hammer so that you loose heat to the dies very
rapidly.
 I would suspect that Keith uses adjustable limit switches to cycle the
cylinder.
 A friend of mine, who used to work at Vickers while in grad school, at one
time told me about an idea he had to build a press with a 12" cylinder. It
would be powered by a large gpm pump and a regenerative valve that cycles
the cylinder return flow directly back into the inflow side. He said that
the cycle timing could approximate the bpm of a power hammer. At those
speeds the billet would stay hot much longer.
 I have used both manual and solenoid control valves and I believe foot
controlled micro switches controlling the flow direction of a remote
solenoid valve located on your power pack are the way to go.
----- Original Message -----
From: Ed Fasula <[email protected]>
To: <[email protected]>
Sent: Sunday, February 03, 2002 11:01 AM
Subject: [TheForge] Hydraulic Press Control


> We had a thread going here about building a hydraulic press.  I'm getting
> materials together to build it, but I also want to use electronic
> controls.  In the UMBA tape mentioned Keith Johnson demonstrates an
> automatic control setup to repeatedly stroke the cylinder.
>
> To set the force, I think Keith used an adjustable pressure relief
> valve.  He didn't detail how he controlled the repeat cycle.  I would
guess
> that he had a flow sensor on the relief valve outlet which worked with a
> solenoid valve and an adjustable timer.
>
> I was thinking that the same could be achieved with a pressure sensor
> replacing the relief valve and flow sensor.
>
> Also, I don't know why he doesn't use an electric switch to control his
> solenoid valve when in manual mode instead of the mechanical valver.
>
> Has anyone got advice on how to do this and where to get the stuff?  I
have
> a spring center open solenoid valve already.
>
> Thanks,
> Ed
>
>
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