可伸缩的液压缸是自卸汽车翻转机构中的重要组成部件。制造一套液压缸金属材料消耗量较大,平均每套要消耗近50公斤重的热轧无缝钢管。如果自卸车和挂车的产量很多,那么采用无切削生产工艺是可以节省很多金属材料的。目前已有了这种可能,如图一所示,使缸壁朝内外直径方向同时加粗,以便用来限制组件脱出和用来形成安装密封 The retractable hydraulic cylinder is an important part of the dump truck turning mechanism. The manufacture of a hydraulic cylinder consumes a large amount of metal materials, on average, each consumes nearly 50 kg of hot-rolled seamless steel tubes. If the dump truck and trailer production, then the use of non-cutting production process can save a lot of metal materials. This has been possible at present, as shown in Fig. 1, with the cylinder walls being roughened in both the inside and outside diameters in order to limit the ejection of the assembly and to form a mounting seal