APPARATUS FOR FORMING RADIALLY CORRUGATED BELLOWS TYPE TUBES Russian patent published in 2001 - IPC

FIELD: plastic metal working, namely apparatuses for making radially corrugated bellows type tubes. SUBSTANCE: apparatus includes detachable die having on inner surface dents and recesses with profiles corresponding to that of bellows and punch. The last has annular grooves in lateral surfaces for placing elastic shaping members joined through radial and axial ducts with pressure source. Apparatus is provided with cylindrical rod having annular turning on lateral surface. Punch is fixed and it has axial opening. Cylindrical rod is mounted in axial opening of punch with possibility of reciprocation motion and successive communication with radial ducts of punch through annular turning. Number of elastic shaping members is equal to number of recesses of die. Apparatus allows to make radially corrugated tubes without punch motion along axis of blank. EFFECT: uniform thickness of radially corrugated tubes. 2 cl, 1 dwg