Back to results
US 2013/0000373 A1Published application
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.
Claims16
A method of manufacturing a branched pipe comprising:
- an elastic body loading step of loading an elastic body in an inside of a pipe blank;
- a first swelling step of swelling a swelled part formed by partially swelling a main body 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,
- the first swelling step including forming a slit along the predetermined direction as the opening.
2 more elements
(canceled)
A branched pipe manufacturing device comprising:
- a shaping die including a pipe hole and a branched hole, the pipe hole accommodating a pipe blank, and the branched hole extending outwards of the pipe hole from the pipe hole;
- an opening forming mold fixed within the branched hole at a position spaced apart from the pipe hole by a prescribed distance, and disposed along a (predetermined direction when an inside of the branched hole is viewed from an inside of the pipe hole, the opening forming mold including an opening forming portion sharply protruded towards the pipe hole;
- and
- a pressurizing part configured to pressurize the shaping die,
- the opening forming portion being a cutting blade disposed along a circumferential direction of the branched hole, and
- the opening forming portion being formed by an outer peripheral surface and an inner peripheral surface, the inner peripheral surface being slanted against the outer peripheral surface at an acute angle.
3 more elements
(canceled)
(canceled)
Dependencies are inferred from the claim text.