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前言在汽车机床等制造业中,大量采用双头螺栓作紧固件,双头螺栓的螺纹加工,一般均采用搓丝,滚丝成型。当双头螺栓两头的螺纹直径和螺距相同时,可以利用加宽搓丝板使两头螺纹同时成型。但是,当它们的直径相同,螺距不同时,通常只能单头分序加工,这在紧固件制造业中已成为常规工艺,如图1所示。
Preface In the automotive machine tools and other manufacturing industries, a large number of studs for fasteners, studs thread processing, are generally used Roll, roll forming. When both ends of the stud bolt have the same diameter and pitch, it is possible to form the two-headed thread by widening the spiral plate at the same time. However, when they are of the same diameter and different pitches, usually only a single head sequencing process, which in the fastener manufacturing industry has become a conventional process, as shown in Figure 1.