PRODUCTION OF THICK-WALLED CYLINDRICAL BODY
PURPOSE:To form a thick-walled cylindrical body having high accuracy without relieving of strain, by curving the end edges of a half split pipe to a curved shape in the direction tangential with the diametral direction, and negating the deformation by the heat input of gus cutting for straight cutti...
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Zusammenfassung: | PURPOSE:To form a thick-walled cylindrical body having high accuracy without relieving of strain, by curving the end edges of a half split pipe to a curved shape in the direction tangential with the diametral direction, and negating the deformation by the heat input of gus cutting for straight cutting and edge preparation. CONSTITUTION:Both end edges 1a, 1b of a half split pipe 1 are formed to a curved shape peaking at the central part in the stage of forming said pipe by cold pressing. The curving size A is made coincident with the recessing size at which the pipe deforms to the inner side when it is subjected to straight cutting and bevel cutting. The pipe 1 is then subjected to cutting over the axial direction thereof by using a curved rail 7 curved in the direction tangential to the pipe and a cutter 8 and both end parts of the pipe 1 are cut straightly 6, 6' and beveled so as to have the diameter size of the pipe 1. The curving size B in this stages allows for the reduction after the cutting. The deformation-free pipe 1 is thus obtained and is welded with the pipe 1 formed in the similar way, whereby a thick-walled cylindrical body 11 is formed with high accuracy. |
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