Form rolling method for joint portion of fluid supply pipe and fluid supply pipe

Patent metadata

Field	Value
Publication number	US-2016288187-A1
Application number	US-201415036933-A
Country	US
Kind code	A1
Filing date	Nov 17, 2014
Priority date	Nov 18, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

Provided is a method of forming a locking ridge for a case of forming the locking ridge on an outer peripheral surface of a joint portion by form rolling, the method realizing a joint portion structure which is superior in pipe detachment prevention performance when pipes with locking ridges are connected by fixing pipe ends with a housing. Using a convex roller arranged inside the workpiece pipe body and a forming circular groove arranged outside the pipe body, the locking ridge is form-rolled such that an upright wall portion thereof is raised at an angle of at least 65° and no greater than 90° with respect to the outer peripheral surface in the pipe axis direction, and that a height of the locking ridge from the outer peripheral surface to the apex of the tip portion is at least a total of curvature radii of faces of the processing means in contact with the pipe body.

First claim

In the claims:

1 . A form rolling method of a joint portion of a fluid supply pipe, the form rolling method forming a locking ridge having an upright wall portion on an outer peripheral surface of a workpiece pipe body, wherein:
the locking ridge includes a curved basal portion extending from the outer peripheral surface, the upright wall portion extending from the basal portion, a curved portion extending from the upright wall portion, and a tip portion extending from the curved portion; and the locking ridge is formed by a processing means arranged inside and outside the pipe body such that the upright wall portion is raised at an angle of at least 65° and no greater than 90° with respect to the outer peripheral surface in a pipe axis direction and a height of the locking ridge from the outer peripheral surface to an apex of the tip portion is at least equal to a total of curvature radii of faces of the processing means arranged inside and outside in contact with the pipe body.

2 . The form rolling method for a joint portion of a fluid supply pipe according to claim 1 , wherein the processing means includes a convex roller arranged inside the pipe body and a forming circular groove arranged outside the pipe body.

3 . The form rolling method for a joint portion of a fluid supply pipe according to claim 2 , wherein: the processing means has a clearance between the convex roller and the forming circular groove that is smaller than a plate thickness of the pipe body; and
the processing means processes the pipe body to form the locking ridge with the upright wall portion extending vertically with respect to the outer peripheral surface.

4 . The form rolling method for a joint portion of a fluid supply pipe according to claim 2 , wherein: the processing means has a clearance between the convex roller and the forming circular groove that is greater than a plate thickness of the pipe body; and
the processing means processes the pipe body to form a convex portion on the outer peripheral surface and then the forming circular groove is moved in the pipe axis direction of the pipe body to press the convex portion against the convex roller, to thereby form the locking ridge.

5 . The form rolling method for a joint portion of a fluid supply pipe according to claim 2 , wherein the convex roller has a curve of a curvature radius R 1 at a contact portion between an apical surface thereof and the upright wall surface.

6 . The form rolling method for a joint portion of a fluid supply pipe according to claim 2 , wherein the forming circular groove has a curve of a curvature radius R U at a contact portion between a tip surface thereof and an inner upright wall surface.

7 . The form rolling method for a joint portion of a fluid supply pipe according to claim 2 , wherein the locking ridge is formed while pressure is applied to the pipe body in the pipe axis direction.

8 . (canceled)

Assignees

• Nisshin Steel Co Ltd

Inventors

• Nishijima Shinnosuke
• Nishio Katsuhide
• Ando Akihiro
• Tomimura Kouki

Classifications

• F16L21/06

  with a divided sleeve or ring clamping around the pipe ends (flanged joints F16L23/00; couplings of the quick-acting type F16L37/00) · CPC title

• B21H7/182 Primary

  Rolling annular grooves · CPC title

• B21D17/04 Primary

  by rolling · CPC title

• F16L23/04

  the flanges being connected by members tensioned in the radial plane (F16L23/12 takes precedence) · CPC title

• F16L17/04

  with longitudinally split or divided sleeve · CPC title