我厂承揽了一批薄壁大孔径工程油缸的加工任务。其技术要求很高,加工难度也比较大,我厂常规使用的伞型大头顶尖为φ200mm,而此油缸内径为φ260mm、壁厚6mm、长度为2500mm。一时又购买不到超大尺寸伞形顶尖。为此,采用四爪卡盘原理来保证同心度,设计制造了可调活络内胀胎,效果很好,保证了油缸同心度要求,满足了生产的需要,具体方法如下。 I plant contract a number of large-diameter thin-walled engineering cylinder processing tasks. Its high technical requirements, the processing difficulty is relatively large, I plant conventional umbrella umbrella tip φ200mm, and this cylinder diameter φ260mm, wall thickness 6mm, length 2500mm. Can not buy oversized umbrella. To this end, the use of four-jaw chuck principle to ensure concentricity, design and manufacture of adjustable inner inflation tire, the effect is good, to ensure that the cylinder concentricity requirements to meet the production needs, the specific method is as follows.