| 摘要 |
PURPOSE:To improve the strength of an aluminum sheath by reducing the diameter of an aluminum pipe which has the steel wire inserted and a greater external diameter than final product side by using a floating plug and thus increasing the strength of the aluminum sheath, and then replacing the internal steel wire with an optical fiber cable core by drawing. CONSTITUTION:In the figure, 5 is die and 6 is a floating plug which has a throughhole 7 where a steel wire 8 runs in the center. Using the floating plug 6 adjusts the thickness of an aluminum pipe 9 as well as reduction in external diameter, obtaining the aluminum sheath which has a prescribed external diameter and prescribed thickness. One terminal of an optical fiber calbe core is connected to one terminal of the steel wire in the aluminum pipe reduced in diameter to final aluminum sheath size by an adequate method, e.g. sleeve connection, etc., and the other terminal of the steel wire is drawn out of the aluminum pipe to insert the optical fiber core into the aluminum pipe, obtaining an aluminum-sheathed optical fiber cable. |
