Permanent mold casting v.s. sand casting?
February 24, 2010 - 12:27 am
What differences, if any, would you expect in the properties of these 2 methods of casting?
permanent mold cannot take very high temperatures so is used for low temp melt metals only. aluminum, zinc, magnieseium etc. sand is a refractory and can take high temps,steel, iron, stainless etc.
permanent molds are very expensive, sand molds are relatively cheap and quick
permanent molds are quite accurate, sand molds not so much.
permanent molds require draft and sometimes complex folding parts to be able to withdraw from the interior. sand is simply shaken out.
February 24th, 2010 at 5:45 am
Rather than do your homework for you… Consider what the differences might be in the way the metal freezes, in the how the mold fills, the chances for non-metallic inclusions, the stresses exerted on the cast part as the metal cools and shrinks, the amount of time the metal stays hot after it solidifies, the surface finish of the part, the ability of gasses to be dissipated, and there are probably other things I have not mentioned. good luck
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February 24th, 2010 at 6:01 am
Technically none. The methods are two processes for achieving the same goal. Properties are internationally associated with materials. Hence, you must reformulate the question. Often in science the answers depend on us framing the question properly. One could choose to ask what cost differences, what product output speeds, what initial investment, what manpower requirement, what wearout or other value analysis considerations would lead on to choose one or the other under a given set of known operating factors, what pollution, what air quality risk, what injury and actuarial risks, what ancient egyptians would do….
In short, meaning is often our minds version of our perceived ability to comminicate. That implies that life itself could be defined by the ability of any substance of higher order than an atom to communicate with anything else. But that makes energy pretty intelligent because we communicate with it, actually we depend on it. If you can read this how do you know that a PERSON is somewhere doing it, huh? Do you ever give some low little silicon mess of connections even the smallest little nod of credit, even in your dreams. You could you know. But noooooooooooooo. You fumble around with your thousands of years old technologies that were understood in exquisite detail by your gandfathers great grandfathers great granfathers great granfather…
I’m not bragging, just stating a few facts.
Um, sorry if I got off on a track. Differences. Well, that would include a lot, wouldn’t it. Write me back if that hastyface guy says anything, ok? It makes a difference.
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February 24th, 2010 at 6:45 am
permanent mold cannot take very high temperatures so is used for low temp melt metals only. aluminum, zinc, magnieseium etc. sand is a refractory and can take high temps,steel, iron, stainless etc.
permanent molds are very expensive, sand molds are relatively cheap and quick
permanent molds are quite accurate, sand molds not so much.
permanent molds require draft and sometimes complex folding parts to be able to withdraw from the interior. sand is simply shaken out.
References :