Key groove machining positioning device

A key groove machining positioning device is characterized in that a supporting piece and a set of pushing pieces are arranged on a bottom plate, a positioning base plate is arranged on the supporting piece or the bottom plate, a positioning piece is movably connected to the positioning base plate, a pressing rod is arranged at the upper end of each pushing piece, and the pushing pieces can drive the pressing rods to move up and down. The problem of the symmetry degree during machining is solved through the multiple positioning pins; the pin shaft belongs to a quick-wear part and can be abraded during continuous machining, compared with a positioning plate and a positioning pin shaft, replacement is more convenient, and the machining cost is reduced; seven pin shafts are adopted to position a long shaft, the machining stability is completely guaranteed, if a positioning plate is selected, a certain point of the positioning plate is possibly abraded in the continuous machining process, the stability cannot be