| 摘要 |
A light-alloy casting producing method is provided in which a T6 treatment can be given to a light-alloy casting without any heat treatment furnace (or aging furnace), so that its mechanical properties such as tensile strength can be adequately heightened. This method includes: a mold preparing process of preparing a mold which includes a sand mold part which is provided with a riser section, and a metal mold part which is disposed apart from the riser section, the sand mold part and the metal mold part forming a cavity section; a casting process of pouring a molten light-alloy into the cavity section of the mold; a metal mold part removing process of separating the metal mold part from a casting which is formed by pouring; a quenching process of bringing a cooling medium into contact with the surface of the casting from which the metal mold part is removed, and thereby, cooling the casting rapidly; an aging process of covering the metal mold part-removed section of the casting with a heat keeper, and keeping the whole casting which is surrounded with the sand mold part and the heat keeper at an aging temperature for a predetermined period of time, using the heat which is kept by a riser portion.
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