DEVICE FOR MANUFACTURING HOLLOW RING SLEEVE Russian patent published in 1997 - IPC

FIELD: mechanical engineering. SUBSTANCE: device consists of punch and die. The punch is provided with a hollow cylindrical portion, including the outer and inner calibrating collars, and shank portion connected with the cylindrical portion via a calibrating portion made up as a hollow truncated cone. When sleeves provided with projections inside the space are manufactured grooves are made on the outer and/or inner working sides of the calibrating portion the side walls and base of which are parallel to the axis of symmetry of the punch. In extruding a blank the outer branch pipe is additionally deformed by way of expanding. The inner branch pipe is additionally deformed by way of squeezing when the branch pipes pass through the calibrated portion of the punch, the calibration of the projections between the side walls of the grooves being also carried out. EFFECT: enhanced efficiency. 4 cl, 3 dwg