前言在毛主席革命路线指引下,我国柴油机制造业迅速发展,柴油机启动齿圈等中型环形零件的需要量急骤增加。原来的自由锻扩孔、钢板切割、型钢弯形对焊等工艺,已不能适应柴油机制造的需要。为此,我厂设计、制造了一台立式扩孔机,用辗扩工艺生产柴油机启动齿圈(图1)的毛坯。 Foreword Under the guidance of Chairman Mao’s revolutionary line, the diesel engine manufacturing industry in our country has developed rapidly. The demand for medium-sized annular parts such as diesel engine starting gear rings has risen sharply. The original free forging reaming, steel cutting, steel bending-butt welding and other processes, can no longer meet the needs of diesel engine manufacturing. To this end, I plant design, manufacture a vertical reaming machine, rolling out the process of production of diesel engine starting gear ring (Figure 1) rough.