在机械修理过程中，经常碰到螺栓在螺孔口部或n部以下位置断裂的现象。造成这种现象的原因一般是螺栓锈蚀或拆卸时用力过大。解决此类问题的常规方法～般有两种：一是加大螺纹孔来处理，二是在断头螺栓轴心部用小于原螺纹直径两号的钻头和丝锥钻孔、攻丝，再用相应的螺栓将断裂 In the mechanical repair process, often encounter the bolt in the threaded hole or n below the Ministry of the phenomenon of fracture. The cause of this phenomenon is generally the bolt rust or demolition force too much. There are two general ways to solve such problems: one is to enlarge the threaded hole to deal with the other, the other is to drill at the axis of the broken bolt with a drill and a tap smaller than the original thread diameter of two, The corresponding bolt will break