Because the mold is formed around a one-piece pattern (which does not have to be pulled out from the mold as in a traditional sand casting process), very intricate parts and undercuts can be made.
由于这种铸型是环绕整块型模形成的(无需像传统的砂型铸造工艺那样拔模)，能制作十分复杂的零件和浮雕。
The positive can be produced either by direct modeling in wax over a prepared core (direct lost-wax casting), or by casting in a piece mold or flexible mold taken from a master cast.
正像可以用蜡直接在一个准备好的核心上浇铸成型(直接脱蜡浇铸)，也可以浇在一个模具中，或者从主铸件上取下来的柔韧的模具中。
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