用铅黄铜(HPb59-1)制造螺纹(螺钉、螺塞、套管等)零件,在螺纹滚压成形时普遍存在掉铜屑的问题,即滚丝掉渣。HPb59-1含锌高,属两相黄铜,其显微组织为α相和β相。β相的特性,决定了HPb59-1的热加工性较好,冷塑变形较差。但由于含铅高,切削加工性好,许多机械和仪表零件都用它切削加工成形。以上螺纹零件系采用冷拉棒材,经退火后用滚丝机滚压成 The manufacture of threads (screws, plug plugs, sleeves, etc.) with lead brass (HPb 59-1) is a common problem with copper chips during thread rolling, ie thread doffing. HPb59-1 high zinc, is a two-phase brass, the microstructure of α and β phase. The properties of β phase determine the hot workability of HPb59-1 is better, the cold plastic deformation is poor. However, due to high lead, machinability is good, many mechanical and instrumentation components are used for machining forming. The above-mentioned threaded parts are cold-drawn bars, which are rolled with a thread rolling machine after annealing