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104. How to make matels with plastic molds?

Plastic molds are very supernatural, it can make any things that you like. So the metals are not exceptional. But how ro make the metals with the plastic molds? For example cast bronze.

First they would cast in plaster. Next the plaster casting would be used to make a new mold using sand. This is done in a Sand box!! I bet you had already guessed that? The plaster pattern is placed in the box and sand is packed around it. This is special sand that cannot be reused. It is mixed in a big machine with waterglass just before it is to be used. This is packed into place and CO2 it blown over it to harden it.

Once this is ready the metal is heated in the furnace and then poured into the mold. It is allowed to cool 12 hrs or so (this depends on the size of the casting - bigger equals longer). Once it has cooled the sand is broken away and discarded. The casting is cooled for another 12 or so hours and then ground and polished.

Thus it can be seen, we should know more the things about plastic molds, and we can use it better.

Here are some samples we have done before, please kindly take a look:

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