PIN HAVING AN EXPANDABLE CASING, AND CASTING MODEL HAVING A PIN, AND METHOD FOR CASTING METALS

The invention relates to a pin (12) to be placed on a casting model (10) molded into a casting mold used when casting metals during the production of said mold, comprising a foot (13) standing on the model surface (11) of the casting model (10) and a holding area (14) arranged on the foot (13) for receiving a riser (16) to be molded therein during the production of the casting mold, wherein the riser (16) is plugged onto the pin (12) by means of a riser opening (20) formed in the bottom surface (17) of the riser facing the casting model (10) before the molding in, characterized in that a casing (21) that is elastically expandable and is connected to the foot (13) of the pin (12), immediately adjacent to the model surface (11), enclosing at least the foot (13) of said pin and/or a sub-region of the holding region (14) thereof for the riser (16), connected immediately adjacent to the model surface (11), is fitted to the pin (12) in such a way that, the casing (21), which is widened before the start of the molding, bridges a distance to the model surface (11) that still exists following the molding of the riser (16), such that after casting the model (10) having the pin (12) placed thereon has been de-molded from the casting mold, an intended fracture point (27a) formed by the contour (26) of the expanded casing (26) is formed for a riser residue (28) that remains after the casting operation has been completed.