To provide an internal chilling method where, in the case the member to be internally chilled and a casting metal internally chilling the same are different kinds of materials, the member to be internally chilled is satisfactory and easily internally chilled.
A wear resistant ring 1 is preheated and held into a casting mold 2, and, in a state where ultrasonic vibration is applied to the wear resistant ring 1 from a plurality of directions in such a manner that the whole of the wear resistant ring 1 is uniformly vibrated, an aluminum molten metal 20 is cast into the casting mold 2. Further, at least one selected from the frequency, amplitude and application time of the ultrasonic vibration is regulated in such a manner that the joined layer 1A of the wear resistant ring 1 and the aluminum molten metal 20 is made into a prescribed thickness.
WATANABE TADASHI
SHIRAI HIDETAKA
YOKOSE TORU
SANSHIN DENSHI KK