Rotatable piercing tools for forming bossed holes

Details Rotatable piercing tools for forming bossed holes Rotatable piercing tools for forming bossed holes

B - Operations, Transporting

21

D

164/140

B21D 28/26 (2006.01) B21C 37/29 (2006.01) B21D 28/28 (2006.01) B21D 28/34 (2006.01)

Patent

CA 1103582

A B S T R A C T A rotary piercing tool for forming, in a metal plate or the wall of a metal tube, by pressure and friction-generated heat a bossed hole, said tool comprising a tapered active end portion at one end, a shank for its attachment in a chuck of a machine tool at the other end and a coaxial cavity extending from the free end of said shank to a place at a given distance from the free end of said active end portion.

316432

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