Taper-matched grinding clamp and method for large crosshead assembly

The invention relates to a taper-matched grinding clamp for a large crosshead assembly. The taper-matched grinding clamp is composed of a positioning part and a rotating part, wherein the positioning part comprises a bearing seat placed on a machine tool working platform, a thrust ball bearing matched with the bearing seat, a bearing sleeve arranged outside the thrust ball bearing in a sleeving mode and in interference fit with the thrust ball bearing, and a positioning cover connected to the bearing seat; the positioning cover of the positioning part is correspondingly matched with the inner wall of the lower end of a crosshead pin arranged in and matched with a crosshead taper hole; and the rotating part comprises a transmission cover plate and a Morse taper shank, the lower end of the Morse taper shank is matched and connected with the transmission cover plate, the upper end of the Morse taper shank is matched and connected with a spindle of a machine tool, the lower end of the Morse taper shank is matched