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I've been wanting to learn about the casting process lately, just in the name of curiosity. I've got a pretty good idea of how 2-part molds, venting and casting for the metal models work, but I have no clue about how sprues are produced.
Anyone know? Is it the same idea, with 2 part molds? I feel like there would be air bubbles galore if it were just a large 2 part mold with channels between all the bits.
sprue making, as done by GW(and other companies), is usually done by injection molding
injection molding is a 2 part mold which is injected with heated plastic under air pressure/circular movement to force all the plastic through the supply channels (the sprue itself) and into the places the bits in the sprue are.
I hope this explanation helps
Yeah, while they're both technically 2-part molds, comparing the two is kinda like comparing a Sunfire to a Saleen - Sure, they're both technically cars, but beyond that...
Injection molding is done in large, precision milled steel blocks held together by dozens, hundreds or even thousands of tons of hydraulic pressure, with scorching hot molten plastic forced in at high pressure to make sure that it gets everywhere.
So while it's the same basic concept, the actual process involved is drastically different and geared purely towards making absolutely sure everything goes right.