最近一、二十年,随着电子学在自动控制和计算技术方面的迅速发展,出现了将加工程序记载在象穿孔带、磁带、电影胶卷或插销板之类的程序单上的自动机床。人们习惯地称这类机床为“程序控制机床”。由于程序单的制作容易,而且价廉,同时当加工 In the last decade or two, with the rapid development of electronics in automation and computing technology, automated machines have emerged that record machining programs on programs such as perforated tapes, magnetic tapes, motion picture films or latch plates. It is customary to call this type of machine a “program-controlled machine.” Due to the easy production of a single program, but also cheap, at the same time when processing