| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for inspecting the molding defective hole of a cast molded product, wherein the blockade in a complicated flow passage is inspected. SOLUTION: One or more floodlight projectors 10 are provided to the outside communication openings of one or more flow passages formed in the cast molded product and the pulse lights emitted from one or more floodlight projectors 10 are detected by the omnidirectional light detecting surface 21 of one light guide member 20 provided to the separate outside communication openings of the flow passages corresponding to the respective flow passages formed in the cast molded product provided with one or more floodlight projectors 10 and the passed lights are guided to the photodetector 30 provided to the end part of the light guide member 20. The detection output of the passed lights detected by the photodetector 30 is compared with a threshold value to measure the blockade degree of the flow passages to judge the quality of the flow passages. COPYRIGHT: (C)2004,JPO&NCIPI
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