我厂生产上使用的压瓦机“螺母”(易损件),材料为青铜;螺纹是75×127(5吋)×5头;螺纹长度为160毫米。由于螺距大、头数多,螺孔直径小,一般C 630车床加工也很困难。我们遵照毛主席“自力更生,艰苦奋斗”的教导,利用废旧料做成一套用原有丝杆作靠模加工内螺纹的专用装置。(如图示)这种装置结构简单、制造方便、加工质量能达到使用要求。由于用丝杆作靠模,加工的螺母与丝杆配合良好,螺纹 The pressure machine “nut” (wearing parts) used in our factory is made of bronze; the thread is 75 × 127 (5 inches) × 5; the thread length is 160 mm. Due to the large pitch, the first few more, the screw hole diameter is small, the general C 630 lathe processing is also very difficult. In accordance with Chairman Mao’s “self-reliance and hard work” teaching, we make use of waste materials to make a set of special devices that use the original screw rod to make the internal thread by the mold. (As shown) This device is simple in structure, easy to manufacture, processing quality can meet the requirements. As a result of the screw as a model, the processing of nuts and screw with a good thread