DEVICE FOR EXPANSION OF TUBES Russian patent published in 1995 - IPC

FIELD: manufacturing tubes. SUBSTANCE: device has unclamping punches 1, 2 of expansion and feeding made in the form of spring-loaded sectors 3, 4 mounted on cones of cores 5 and 6 connected by its lesser bases. The cone of core 5 is attached to rod 7 coupled with slider 9 of connecting rod-free drive 10 by the gr ter base. At translational movement of slider 9 sectors 3 are in contact with pipe 12. Punch 1 is adapted for expansion of corresponding portion of the pipe. Sectors 4 come out of contact with the pipe. At reciprocal movement of slider 9 sectors 3 come out of contact with pipe 12, and sectors 4 are in contact with the corresponding portion of pipe 12, and as core 6 moves, the pipe is fed towards sectors 3 by a step and preliminary expansion occurs simultaneously. Then the process is repeated. EFFECT: enhanced accuracy. 3 dwg