伸缩内筒是掘进机伸缩机构的关键零件,通过轴承、浮动密封与截割主轴等主要的传动部件连接,并与伸缩保护筒一起实现伸缩机构的伸缩。故该零件加工质量及精度直接影响整个伸缩机构的性能。该零件是典型的圆筒类焊接结构件,其加工工艺具有代表性,主要对其加工工艺进行介绍,包括加工方法、设备及加工注意事项。 Telescopic tube is a key part of TBM’s retractable mechanism. It is connected with the main transmission parts such as bearing, floating seal and cutting spindle, and expands and contracts the retractable mechanism together with telescopic protective cylinder. Therefore, the parts processing quality and accuracy directly affect the performance of the telescopic mechanism. The part is a typical cylinder welding structure, its processing technology is representative of the main process of its introduction, including processing methods, equipment and processing considerations.