| 摘要 |
PROBLEM TO BE SOLVED: To suppress the falling of a ventilated disk rotor by heat. SOLUTION: For example, in casting, the metallographic structure of a free end side disk 3 is refined and the residual compressive stress of a free end side disk 3 is increased by rapidly cooling by cooling water the free end side disk 3 on the opposite side of a wheel connection member 2 to which a wheel connection member 8 is continuously connected thereto to reduce the thermal expansion of the free end side disk 3 having a thermal capacity smaller than that of a wheel connection member side disk 2 with large thermal capacity so as to reduce a difference in thermal expansion therebetween for suppressing the falling of a rotor body 1 by heat. The same effect can be obtained by, for example, forming a flow off on the wheel connection member side disk 2 side of a sand mold 4 or by disposing an inoculant 7 for promoting solidification at the free end side disk 3 portion of the sand mold 4. COPYRIGHT: (C)2005,JPO&NCIPI
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