What is molding and pouring

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1 Basics of the casting process

1Basics of the casting process

In the field of manufacturing technology, casting processes represent the shortest possible path from the shapeless material to the finished workpiece. As a rule, only a few work steps are necessary to turn the workpiece into a finished component. A basic distinction is made between casting processes with lost molds (e.g. sand molds) and permanent molds (e.g. metal molds). When casting with lost molds, the mold must be destroyed in order to remove the finished workpiece. Permanent molds, on the other hand, can be opened to remove the casting. The permanent molds are then available again for a new cast.

Furthermore, when casting with lost molds, a distinction is made between casting processes with lost models and permanent models. In both processes, a model is first produced. The mold is then made around this model, for example from molding sand. When casting with lost models, the model remains in the mold after it has been produced. When the liquid metal is poured into the mold, the model is destroyed by the melt. If permanent models are used, the mold is opened again after it has hardened and the model is removed. If cavities are required in the components, for example in engine housings, cores are also inserted into the mold. These are usually made from different molding sands than the rest of the mold in separate work steps.

Building a mold


Molding box

Styrofoam model of a lost form


Post-processing a lost model




Finished model


Diving a lost model (coating with size)