Center body for belt pulley machining

The utility model provides a center body for belt pulley machining. The center body comprises a center main body extending in the front-back direction, an inserted matching hole is formed in the back end of the center main body and used for being in inserted matching with a tip end of one end of a lathe center, a clamping plane used for being in blocking matching with the plane of the corresponding side of the belt pulley is arranged at the front end of the center main body, a positioning mandrel section is arranged on the clamping plane in a protruding mode and used for being in coaxially inserted matching with an inner hole of the belt pulley, the positioning mandrel section and the inserted matching hole are coaxially arranged, and the positioning mandrel section and the clamping plane constitute a positioning step. The center body is correspondingly matched with the tip end of the lathe center in an inserted mode, a lathe tailstock is pushed to drive the lathe center and the center body to move forward, the clamping plane at the front end of the center body abuts against the plane of the corresponding side of the belt pulley in a blocking mode, the positioning mandrel section on the center body and the inner hole of the belt pulley are in correspondingly and coaxially inserted matching, and therefore the clamping effect on the belt pulley is improved, and clamping and machining cost is reduced.