| 摘要 |
Disclosed is a method for making a tube for a telescopic device. The method includes the step of cutting a section from tubular raw material to provide a semi-product of the tube with a desired value of length, the step of pressing the wall of the semi-product of the tube for a first time to make cavities on an external side of the wall of the semi-product of the tube, and the step of pressing the wall of the semi-product of the tube for a second time to deepen the cavities so that the tube is made with a desired depth.
|
