| 摘要 |
PROBLEM TO BE SOLVED: To provide a nozzle not breaking due to stress concentration. SOLUTION: In a nozzle 1 of a hydraulic bulge forming device, the nozzle 1 is composed of a nozzle main body 1a and a nozzle tip member 1b, the nozzle tip member 1b is fixed to the nozzle main body 1a in the state a stepped part 7 is formed, the end face of a tubular stock 3 is pressed by a flat part 8 of the stepped part.
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