Method for processing shape of bomb body blank with bottom concave hole

The invention provides a machining method for the appearance of a bomb body blank with a bottom concave hole. The machining method comprises the steps of bomb body blank inner chamber cleaning, workpiece bottom concave hole taper angle turning and workpiece appearance turning. When the taper angle of the bottom concave hole in the tail of the projectile body blank is machined, in order to guarantee clamping and turning stability of the projectile body blank during taper angle machining and reduce vibration, the lengthened live center is adopted to abut against the center of the bottom of the bottom concave hole, a supporting plate below a square tool table of a lathe is horizontally rotated and locked, and the square tool table is fixed; therefore, vibration is not generated during machining and turning of the taper angle of the bottom concave hole. The process method is simple and convenient, and the processing quality is stable; procedures of welding a cutter bar and polishing welding spots are omitted, the