Abstract: The method casts a disk rotor which can restrain partial abrasion in a sliding ring part, particularly, in the circumferential outer surface. A mold includes a casting cavity to cast the sliding ring part, an outer circumference forming surface, an inner circumference forming surface, a gate group including a plurality of gates formed in the outer circumference forming surface at positions spaced apart from each other at predetermined intervals with respect to a circumferential direction, each of the gates having a central line P2 inclined at an angle greater than 0° and less than 90° with respect to a normal line passing through a center of the casting cavity in a radial direction, and runners. A melt is injected from the gates into the casting cavity at angles ?1, ?2 and ?3 which are greater than 0° and less than 90° with respect to the normal lines, and is solidified.

Abstract: The method casts a disk rotor which can restrain partial abrasion in a sliding ring part, particularly, in the circumferential outer surface. A mold includes a casting cavity to cast the sliding ring part, an outer circumference forming surface, an inner circumference forming surface, a gate group including a plurality of gates formed in the outer circumference forming surface at positions spaced apart from each other at predetermined intervals with respect to a circumferential direction, each of the gates having a central line P2 inclined at an angle greater than 0° and less than 90° with respect to a normal line passing through a center of the casting cavity in a radial direction, and runners. A melt is injected from the gates into the casting cavity at angles ?1, ?2 and ?3 which are greater than 0° and less than 90° with respect to the normal lines, and is solidified.

Abstract: Disclosed is a casting process with use of a lower mold 10 having a hollow corresponding to a partial profile of a casting, and an upper mold 22 supporting a core 24 and defining a mold cavity 12 in cooperation with the lower mold. The process includes: pouring a necessary minimum amount of a molten metal for obtaining a casting into the hollow; moving downwardly the upper mold at a predetermined first speed to a predetermined height level; further moving downwardly the upper mold assembly, from the predetermined height level, at a predetermined second speed by changing the descending speed of the upper mold; detecting a status information of the upper mold in a state when the upper mold is superimposed on the lower mold; and stopping the descending movement of the upper mold after detecting that the status information comes at a predetermined state.

Abstract: A rotor for an electric rotary machine includes a rotatable rotor body, a plurality of magnet portions provided at the rotor body in circumferential direction with a certain interval, and a supporting portion provided at the rotor body for supporting the plurality of the magnet portions. At least the supporting portion of the rotor body is made of ferritic cast iron as base material.