PLASTIC FORMING DEVICE, AND PLASTIC FORMING METHOD

PROBLEM TO BE SOLVED: To provide a plastic forming device and a plastic forming method for forming substantially uniform distortion while minimizing the deposit of a work on bent parts. SOLUTION: When performing plastic forming by forcibly distributing a work 37 in flow passages 33a-33c of a cylindrical container, a plurality of pairs of bent parts 34 and 35 having an angle of inclination below 90° are formed in the flow passages, and shearing force is applied to the work at the bent parts a plurality of times. Since the plurality of bent parts are present, the shearing force is applied a plurality of times by a single press-feed of the work, the distortion generation efficiency is improved, the quantity of the work to be deposited on an inner surface of the bent parts is reduced, and a uniform distortion is given to the work. COPYRIGHT: (C)2004,JPO