| 摘要 |
PURPOSE:To obtain a titled pipe which is free from deformation and crushing by external pressure and assures >=52% electric conductivity by forming a thermosetting Al alloy tape which is attached longitudinally on an optical cable into a pipe shape and reducing the diameter of the pipe then treating the same under heating. CONSTITUTION:A thermosetting Al alloy tape 11 let off from a reel 12 is fed through a slitter 13 to a forming unit 14, and is attached longitudinally on an optical cable 16. Both side edges of the tape 11 are rounded with a forming die 14 to form the tape into a cylindrical shape, the butt parts whereof are welded continuously with an electric welding device 17 to form a pipe 18 contg. the cable 16. The pipe 18 is detected of flaws with a magnetic inspection device 25, and is then fed to a reducer 19 for diameter by means of an endless track 26 so that the pipe is reduced successively in diameter by a die 20 which regulates the outside diameter of the pipe 18 and a floating plug 27 which regulates the bore of the pipe 18. The pipe 18 is hardened in a heat treatment device 31, whereafter the pipe is inspected of flaws with the device 25 and is taken up on a reel 32. |
