车床切螺纹系统是车床进给系统的重要组成部分。其设计好坏,不仅决定了车床切螺纹时传动误差的大小,而且还会直接影响到车床进给箱的结构繁简和系统的刚度。由于过去这方面的研究还有不足之处,以致设计出来的某些车床或多或少地出现一些问题。例如,有的车床切螺纹系统的移换机构和交换齿轮配合得不合理,以致使加工蜗杆螺纹时的传动误差大大超过了允许值;有的车床切螺纹系统因选择的增倍机构的传动比 Lathe thread cutting system is an important part of the lathe feed system. The design is good or bad, not only determines the size of the transmission error when cutting the lathe, but also directly affect the structure of the lathe feed box and the rigidity of the system. Due to the inadequacies of the research in this area in the past, some lathes designed have some problems more or less. For example, some of the lathe thread cutting system and the replacement of the exchange mechanism with the unreasonable exchange of gears, so that the process of worm thread transmission error greatly exceeded the allowable value; and some lathe thread cutting system due to the choice of the amplification mechanism of the transmission ratio