To provide a technique for suppressing occurrence of buckling at a large diameter part in manufacture of a pipe by UO bending method.SOLUTION: A manufacturing method for a pipe having a large diameter part, a small diameter part, and a reduced diameter part connecting the large diameter part and the small diameter part includes a step at which a metal plate is formed into a U-shaped member having a U-shaped cross section, and a step at which the U-shaped member is formed into a pipe shape. The U-shaped member has a bent part which faces an opening between both ends of the U-shaped cross section, and a pair of opposite side walls which are continuous with the bent part. An opening degree between a pair of opposite side walls of a portion for forming the small diameter part is larger than an opening degree between a pair of opposite side walls of a portion for forming the large diameter part.SELECTED DRAWING: Figure 10
【課題】UO曲げ製法によるパイプの製造において、大径部における座屈の発生を抑制する技術を提供する。【解決手段】大径部と、小径部と、大径部及び小径部を繋ぐ縮径部と、を有するパイプの製造方法であって、金属板材をU字状断面を有するU字状部材に成形することと、U字状部材をパイプの形状に成形することと、を含む。U字状部材は、U字状断面の両端の間の開口に対面する湾曲部と、湾曲部に続く対向する一対の側壁と、を有しており、小径部を形成するための部分の対向する一対の側壁の開き度合いが、大径部を形成するための部分の対向する一対の側壁の開き度合いよりも大きい。【選択図】図10
PIPE MANUFACTURING METHOD
パイプの製造方法
06.05.2021
Patent
Elektronische Ressource
Japanisch
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