Resurrection of a CFEI 100 KVA Induction Furnace

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awemawson:

--- Quote from: John Rudd on July 29, 2020, 11:57:35 AM ---Dnot wishing to teach grany etc. etc.
If operating speed is an issue whether pneumatic or hydraulic, cant you use speed restrictors to increase the operating time?

--- End quote ---

John, If you look 'up thread' you'll see that I have two one way valves (up & down) each followed by a flow restrictor

awemawson:
Pekka, to be frank I doubt that any practical to use liquid, including water, is any less viscous than diesel, which is pretty free flowing.

Using a liquid as the operating medium has the advantage that it is theoretically incompressable hence no bounce.

BUT Raydne designed it to operate on air - so I'll see if I can temporarily revert to just air and play with the flow restrictors

John Rudd:
Ahh...sorry Andrew, missed that bit... :Doh:

awemawson:
Pay attention John :lol:

So I decided to revert to 'air only' tilting on the Raydyne furnace body as originally designed. I wasn't happy having the oil fumes in close proximity to the molten metal and the speed of tilting was a bit slow. It definitely was less bouncy, but at an unacceptable price in terms of other parameters.

I could put the oil system back relatively easily, but to plumb for 'air only' necessitated physically removing the reservoir (a cut down CO2 cylinder!) as the plumbing for the flow restrictors was screwed into a tapping in the cylinder wall. Just one pipe to remove and a somewhat longer one to make and it's done.

With the restrictors set full bore it now raises in 4 seconds and comes crashing down - just cracking them open gives about a 10 second rise and probably I could extend that a bit with careful setting of the valve. There is no longer a delay in raising the crucible, as that previously was caused by it taking time to pressurise the air over the oil in the reservoir.

It'll take a while for the remains of the oil / diesel mix to flush out of the pipes and cylinders - already afer only a few cycles the exhaust 'air' is getting a lot cleaner and less fumy.

Meanwhile the more suitable pipe clips have arrived so I'll try and fit those today - not sure my back is up to all the bending down so I may try raising it to waist level with the forklift.

mattinker:
Hi Andrew,
Are your molds going to be attached to the body?It would seem to me that you'll need to be able to adjust the speed on the fly to be able to have a full sprue to avoid taking in air. How did that work out in the past?

Cheers, Matthew

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