Permanent Mould material
Permanent Mould material
(OP)
Im after a permanent mould material for a small batch of centrifugal cast items.
I was looking at graphite but Im finding it hard to get in Ireland. And shipping is a killer from the uk.
My next option is I guess cast Iron, because this is harder to obtain in my near mould shape I would have to cast/or machine a rough mould from it first and then finish machine.
This is where graphite would benefit me as it is easy machine, albeit dusty/dirty.
Have I any other options as to material choice? Material I am pouring is Lm25 aluminium alloy.
Can anyone think of any other suitable material that I could perhaps protect further with a slurry wash.
I will go for graphite if I have too, Im just putting this out there in case Im missing any material I had not thought of.
Thanks in advance
BG
I was looking at graphite but Im finding it hard to get in Ireland. And shipping is a killer from the uk.
My next option is I guess cast Iron, because this is harder to obtain in my near mould shape I would have to cast/or machine a rough mould from it first and then finish machine.
This is where graphite would benefit me as it is easy machine, albeit dusty/dirty.
Have I any other options as to material choice? Material I am pouring is Lm25 aluminium alloy.
Can anyone think of any other suitable material that I could perhaps protect further with a slurry wash.
I will go for graphite if I have too, Im just putting this out there in case Im missing any material I had not thought of.
Thanks in advance
BG





RE: Permanent Mould material
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RE: Permanent Mould material
Sand moulds are used for small batches but can't be called a permanent mould.
RE: Permanent Mould material
You might want to look at the Shell Molding Process, relatively inexpensive if the your quantity isn't too large.
Also look at the Lost Foam Process. If the part is fairly intricate.
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RE: Permanent Mould material
Micalbrch, sand is not of much use, something like an oil bond disintegrates with the centrifugal force, and if I use co2 cure cooling becomes a problem, since water will dissolve the co2 mould.
Metal moulds make full sense since this is a centrifugal cast operation, Im taking full advantage of the process for improved density/less-porosity/inclusions. And I can also control cooling with water.
I thought I was onto a good idea a while ago when looking at salt as a permanent mould, but this too will dissolve in water, and has a high pouring temperature, 800c approx. Its something I must keep in mind that could be of use for other operations though.
Thanks for the help guys,
BG
RE: Permanent Mould material
What I mean is, the 2nd core mould will easily remove once part is cooled.
Hope that rather strangely worded post makes some sense.
BG
RE: Permanent Mould material
Mike Halloran
Pembroke Pines, FL, USA