| 摘要 |
The present invention relates to a method for manufacturing a taper-type spring tube and a subsequent expansion device which reduces the frictional force generated from an overlapped area of the spring tube due to the buffering function and prevent deformation of the tube. The function of the tube is produced by the following steps: a warping step (S1), an expansion step (S2), and a molding step (S3). A spring tube is formed as a taper type tube with a narrow top and a broad bottom structure to reduce frictional resistance of the overlapped area during usage and improve the durability of the abrasion effect. [Reference numerals] (S1) Winding step;(S2) Expanding step;(S3) Forming step |
