MANUFACTURE OF PRODUCTS BY SPINNING METHOD Russian patent published in 1994 - IPC

FIELD: manufacture of thin-walled base members and tubes. SUBSTANCE: method involves putting hollow workpiece on male die until resting its bottom upon face end of the male die and its feeding to spinning female die. In the process of straining working fluid is fed under pressure to space formed by male die and bottom of workpiece. Any liquid can be used as working fluid. Thus drawing effort starts its effect on bottom of workpiece, and this contributes to straining process. To intensity penetration of liquid pulse pressure is generated. Pressure can be increased during shaping process. To obtain desired shape of bottom of product drawing effort is generated after leaving of bottom from straining zone. In case of manufacture of long-sized products working fluid is fed after shaping a portion of a product. The length of this portion should not be less than its inner diameter. EFFECT: enhanced operating efficiency. 5 cl, 1 dwg