air operated expanding mandrel

例句：

1. 1.The air-operated expanding mandrel is used to expand the material being processed.
   气动式扩张芯棒用于扩展正在处理的材料。
2. 2. The mandrel was designed to be easily retracted after use, ensuring safety during handling.
   芯棒设计为使用后易于收回，确保操作过程中的安全性。
3. 3. The air-operated expanding mandrel is an essential tool in the process of metalworking, allowing for precise control over the expansion of materials.
   气动式扩张芯棒是金属加工过程中不可或缺的工具，允许对材料的膨胀进行精确控制。