| 摘要 |
PROBLEM TO BE SOLVED: To provide a press necking detection method capable of easily and precisely detecting a press necking region even in a case that the thickness of a press-molded product is thin, and a press necking detector. SOLUTION: The press necking detection method has a temperature measuring process for periodically heating one side of the press-molded product and measuring a change in the temperature on the other side of the press-molded product with the elapse of time, a phase delay calculation process for calculating the phase delay of each region with respect to a reference periodic wave for periodically heating one side of the press-molded product on the basis of the periodic wave showing the change in the temperature on the other side of the press-molded product with the elapse of time obtained in the temperature measuring process and a press necking detection process for calculating thickness distribution on the basis of the phase delay of each region obtained in the phase delay calculation process and detecting the press necking region from the result of the thickness distribution. The press necking detector is also disclosed. COPYRIGHT: (C)2008,JPO&INPIT
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