Abstract: Aiming at the problem of existing bench work chamfering which is low efficiency, poor consistency and special machine tool chamfering which is poor flexibility and difficulty in adjustment, a set of top trimming technology of bevel gear is studied.At first it reforms existing machining center, and designs reasonable cutters and fixtures, and formulates reasonable process parameters, and selects typical bevel gear parts for flange repair technology.In the experiment, the flange repair error is controlled within 0.3 mm.The technology has the characteristics of novelty, creativity and practicability, and has the value of popularization and application.