METHOD FOR MAKING ANGULAR PIECE AND APPARATUS FOR METHOD EMBODIMENT Russian patent published in 2002 - IPC

FIELD: plastic metal working, namely processes for bending tubular blanks in combination with their drawing, possibly at making sharply bent angular parts in different branches of machine engineering. SUBSTANCE: novelty is elimination of step for expanding tubular semifinished blank received by bending due to providing bending angle and also toroidal shape of blank in bending apparatus itself. In order to perform it, rigid heading of the mostly loaded portion of blank is realized during all process of bending. Blank is fixed in direction normal relative to bending plane by its inner diameter. One drift of bending apparatus has shaped protrusion; its other drift has reciprocal recess. One bending mandrel is secured to stationary housing; another bending mandrel is mounted in dovetail guide on channel-like frame which is jointly connected with stationary housing by fashion "ear-fork". EFFECT: enhanced efficiency due to combination of two operations, lowered cost price of making angular piece. 2 cl, 4 dwg