Oversized cathode roller titanium cylinder vertical lathe alignment tool and method

The invention discloses an oversized titanium cylinder vertical lathe alignment tool and method. The alignment tool comprises a lifting threaded sleeve, a taper sleeve attached to the inner surface of the lifting threaded sleeve, a lifting nut connected with the lifting threaded sleeve through threads, a taper shaft connected with the taper sleeve through a bolt, and a lifting lug arranged on a top disc. The alignment technology comprises the steps that the titanium cylinder with the polished upper end face and the polished lower end face is placed in a base disc groove, the coaxiality of the titanium cylinder and the tool is adjusted according to the outer diameter of the groove and the outer diameter of the titanium cylinder, ellipticity calibration of the lower end, the middle end and the upper end of the titanium cylinder is completed through the roundness calibration tool, and finally the straightness is corrected. The roundness correction work can be completed on the ground by the tool, so that the safe