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METHOD FOR MANUFACTURING NARROW MOUTHED SHELL, AND NARROW MOUTHED SHELL
METHOD FOR MANUFACTURING NARROW MOUTHED SHELL, AND NARROW MOUTHED SHELL
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机译：制造窄口壳的方法和窄口壳
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摘要
PROBLEM TO BE SOLVED: To provide a method for manufacturing a narrow mouthed shell for large pressure vessel and the narrow mouthed shell with which the development of an underfill can be prevented by restraining the shrinkage of a material at the boundary part between the narrow mouthed part and a straight cylindrical shell, and a product yield is improved at low cost.;SOLUTION: In the method for manufacturing the narrow mouthed shell so as to integrally form the narrow mouthed part 2b at the end part of the cylindrical shell 2a by forging into the expanding diameter while rotating a ringed raw material 1 between a core metal 4 and an anvil 5, the ringed raw material 1 is forged into the widening diameter by shifting the core metal 4 in the axial direction to the reverse direction of the narrow mouthed part 2b at each round or a plurality of rounds. In this way, since the inclination of the outer peripheral surface can gently be formed at a plurality steps by forming the narrow mouthed part 2b at the plurality of steps, the underfill caused by the shrinkage at the boundary between the narrow mouthed part 2b and the cylindrical shell part 2a and the development of the underfill on the outer peripheral part of the narrow mouthed part 2b can be prevented.;COPYRIGHT: (C)2008,JPO&INPIT
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