公开(公告)号：EP3121502A4

公开(公告)日：2017-12-27

申请号：EP15764657

申请日：2015-02-26

申请人： NIFCO INC

发明人： SOUMA YOUHEI ,  NAKAYA HIROYUKI ,  TOMONO YOSHIO ,  KITAMURA TADAHIRO ,  GOTO YOSHIYUKI

IPC分类号： F16L43/00

CPC分类号： F16L43/008 ,  B29C45/4421 ,  B29L2031/243

摘要： A curved portion (14A) at an inner circumferential face (15) on a bend direction inside of a bend (14) has a circular arc shape. By configuring the curved portion with a circular arc shape, a recess (16), serving as an example of a cross-sectional area enlargement portion that enlarges the cross-sectional area of a flow path of a pipe body (12) running along a direction of an axial line 13, is formed in the inner circumferential face (15) on the bend direction inside of the bend (14).

公开(公告)号：EP2899445A4

公开(公告)日：2016-05-11

申请号：EP13838262

申请日：2013-09-13

申请人： NIFCO INC

发明人： SOUMA YOUHEI ,  NAKAYA HIROYUKI ,  TOMONO YOSHIO ,  KITAMURA TADAHIRO ,  GOTO YOSHIYUKI

IPC分类号： F16L43/00 ,  B29C33/44 ,  B29C45/26 ,  B29C45/44 ,  B29L23/00 ,  B29L31/24 ,  F16L41/02 ,  F16L41/03

CPC分类号： F16L43/008 ,  B29C45/2614 ,  B29C45/4421 ,  B29L2023/004 ,  B29L2031/24 ,  F16L41/021 ,  F16L41/023 ,  F16L41/03

摘要： A tube main body (12) of a curved tube (10) has a flow path following an axis line (12A), and includes a bent portion (14) at one portion in a direction along the axis line (12A). Also, in an inner periphery (14A) inside a bending direction of the bent portion (14) in the tube main body (12), a concave portion (16) is formed as an enlarged cross-section portion along a direction of the axis line (12A). Incidentally, in an inner die of a die for forming a curved tube, a hinge core forming the concave portion (16) is inserted in a groove portion of a main core, and the main core moves in a retraction-positional direction, so that a tip portion of the hinge core having a shape engaging with the inner periphery (14A) inside the bending direction of the bent portion (14) swings to a formation position of the main core.