Spherical surface machining method

The invention discloses a spherical surface machining method belonging to the technical field of machine part machining. The method comprises the following steps of sequentially carrying out rough turning, finish turning, grinding and polishing on a spherical surface of a workpiece to be machined by using a numerical control machine tool, wherein the grinding step is implemented as follows: the finish-turned spherical surface of the workpiece to be machined is machined by using an ultrasonic metal surface machining device which is arranged on the numerical control machine tool. According to the spherical surface machining method, the finished-turned spherical surface of the workpiece to be machined is machined by using the ultrasonic metal surface machining device which replaces a numerical control grinder in the prior art, and therefore, the precision and the smooth finish of the spherical surface of the workpiece to be machined are ensured, and meanwhile, the machining process is simplified, the used equipment is reduced, the machining efficiency is improved, and the machining cost is lowered.