介绍了异形螺杆数控铣削加工中应用无瞬心包络原理的理论与实践。考虑到此类工件的特殊和难度而提出的加工原理、机床结构及数控程序的编制均经过了实验室考验，并已得到了多家企业的应用。 The theory and practice of application of instantaneous envelope principle in profiled screw rod NC milling are introduced. Taking into account the special and difficulty of such workpieces proposed by the principle of processing, machine tool structure and NC programming have been tested in the laboratory and has been a number of enterprises.