液压挖掘机和起重机使用的油缸,往往长达10～15米,精度为D4,光洁度为(?)9,形状误差要求也较高。我厂采用一次镗滚成形加工法,虽需配置镗滚专机和镗滚头,但其加工效率高,质量好,经济效果较好,是目前常用的加工方法之一。一、镗滚工艺及其结构工件材质为45号钢管,坯料内孔单边余量应控制在5毫米内,其弯曲度<0.3毫米/米。 Hydraulic excavators and cranes used cylinders, often up to 10 to 15 meters, accuracy of D4, finish (?) 9, the shape error requirements are higher. I plant a boring and rolling forming method, although the need to configure the boring roll plane and boring head, but its processing efficiency, good quality and good economic results, is currently one of the processing methods. First, the boring process and its structure The workpiece material for the 45 pipe, billet unilateral margin should be controlled within 5 mm, the curvature of <0.3 mm / m.