| 摘要 |
A material having an internal cooling passage is provided which reduce a recirculation area to perform effective cooling. In a material having an internal cooling passage formed therein which has a wall surface 23 provided with cooling ribs 25 a , 25 b thereon to allow a cooling medium to flow along the wall surface 23 , the cooling ribs 25 a , 25 b are arranged so that a portion of the cooling medium flowing in the vicinity of the center 51 of the wall surface 23 included in the cooling passage is allowed to flow toward both side edges 6 b , 6 c of the wall surface 23 and so that a portion 58 of the cooling medium flowing on a surface of the cooling ribs 25 a , 25 b moves to conform to the surface of the cooling ribs 25 a , 25 b and flows to the wall surface 23.
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