Method of bending pipe and apparatus therefor
AssigneeYutaka Giken Co., Ltd.
InventorsHiroyuki Takahashi, Hiroshi Takada
Life of this patent
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Abstract
A movable die base (2) is moved toward a stationary die base (1). A pressing force is applied by a bending punch (21) disposed on the movable die base to a bending target portion of a pipe (A) which is placed on a die (11) provided on the stationary die base and which has inserted therein a core metal (17). At the time of this bending work, both ends of the pipe are restricted by holding them with restriction pads (22). When the pressing force is applied by the bending punch, the restriction pads are displaced to follow the pressing of the bending punch, whereby restricted state on both ends of the pipe is constantly maintained.
Claims8
A method of bending a pipe comprising:
- moving at least one of a pair of die bases lying opposite to each other toward the other thereof;
- applying a pressing force to a bending target portion of a pipe by a bending punch disposed on one of said die bases, said pipe being placed on a die provided on the other of said die bases and having inserted therein a core metal so as to be bent along a forming section of said core metal;
- and
- holding both ends of the pipe between a pair of restriction pads provided on the one of said die bases and said die such that, when the pressing force is applied to the bending target portion by said bending punch, said pair of restriction pads and said die are displaced to follow the pressing by said bending punch, whereby the pipe is bent in a state in which the restriction at both ends of the pipe is maintained.
An apparatus for bending a pipe comprising:
- a pair of die bases lying opposite to each other;
- a bending punch for applying a pressing force to a bending target portion of a pipe, said bending punch being disposed on one of said die bases;
- a die for placing thereon the pipe, said die being disposed on the other of said die bases such that at least one of said die bases is moved toward the other thereof to apply the pressing force by said bending punch to bend the pipe along a forming section of a core metal inserted into the pipe;
- a pair of restriction pads disposed on said one of said die bases;
- said die comprises two segments, each of said segments being arranged to be swingable, under the pressing force by said bending punch, about a supporting shaft provided respectively toward each longitudinal end of the pipe;
- and
- said pair restriction pads displacing to follow the swinging of each of said segments of said die.
Dependencies are inferred from the claim text.