Titanium hemisphere blank is a closed hemisphere shell and through-hole ball shell connected to the blank, the first closed hemisphere shell outer surface machining, and then cut off, shaped parts in the ordinary horizontal lathe is difficult to process in the CNC lathe is easy to achieve, the use of a few types of tools can be completed in a series of processing of its process content, conducive to the design of the program is conducive to the control of dimensional accuracy. Because there is a special fixture as a positioning reference, so the positioning problem has been considered in the design of the fixture.