Back to results
US 8,833,123 B2Granted
Method for manufacturing branched pipe and branched pipe manufacturing device
AssigneeKomatsu Ltd.
InventorsTaiki Ogura, Tatsushi Itou
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a branched pipe includes: a first swelling step of swelling a swelled part from a main body of a pipe blank by pressurizing the inner surface of the pipe blank by an elastic body, and simultaneously, forming an opening in the tip portion of the swelled part along a circumferential direction; and a second swelling step of swelling the swelled part from the main body by pressurizing the inner surface of the pipe blank by the elastic body.
Claims5
A method of manufacturing a branched pipe comprising:
- an elastic body loading step of loading an elastic body in an inside of a cylindrical pipe blank, which is inserted into a support structure;
- a first swelling step of swelling a swelled part formed by partially swelling a side portion of a main body of the pipe blank outward in a radial direction of the pipe blank through pressurization of an inner surface of the pipe blank by the elastic body, and simultaneously forming an opening in a tip portion of the swelled part along a predetermined direction;
- and
- a second swelling step of further swelling the swelled part from the main body through pressurization of the inner surface of the pipe blank by the elastic body after execution of the first swelling step, and simultaneously folding a periphery of the opening inward toward a center of the opening,
- the first swelling step including forming a slit along the predetermined direction as the opening.
2 more elements
A method of manufacturing a branched nine comprising:
- an elastic body loading step of loading an elastic body in an inside of a cylindrical pipe blank, which is inserted into a support structure;
- a first swelling step of swelling a swelled part formed by partially swelling a side portion of a main body of the pipe blank outward in a radial of the pipe blank through pressurization of an inner surface of the pipe blank by the elastic body, and simultaneously forming a plurality of holes along the predetermined direction in a tip portion of the swelled part;
- and
- a second swelling step of further swelling the swelled part from the main body through pressurization of the inner surface of the pipe blank by the elastic body after execution of the first swelling step, the plurality of holes forming a slit along the predetermined direction as the holes expand during the second swelling step.
1 more element
Dependencies are inferred from the claim text.