Method for manufacturing pipe
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United States of America Patent
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Dec 27, 2022
Grant Date -
Aug 12, 2021
app pub date -
Jan 4, 2021
filing date -
Feb 12, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
A method for manufacturing a pipe includes: press-forming a plate member into a U shape; and press-forming the plate member formed into the U shape into an O shape. The pipe includes a pipe body and a tapered part tilted radially inward and protruding from one end of the pipe body. Before the plate member is press-formed into the U shape, a boundary between a portion of the plate member corresponding to the pipe body and a portion of the plate member corresponding to the tapered part is pressed from a surface of the plate member corresponding to an inner peripheral surface of the pipe to bend the portion of the plate member corresponding to the tapered part toward the surface of the plate member corresponding to the inner peripheral surface of the pipe.
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