DE2215091

1390641 Making electric cables; bonding metal; drawing WESTERN ELECTRIC CO Inc 29 March 1972 [31 March 1971] 14625/72 Headings B3A B3E and B3P [Also in Divisions H1 and B5] In the manufacture of a coaxial conductor 50 having an outer conductor/shield formed as a laminate of conductive materials (e.g. copper and steel), having different coefficients of thermal expansion and joined by a temperature sensitive adhesive, the laminate has a predetermined three dimensional curvature imparted to it with the material at a predetermined elevated temperature and the adhesive in a flowable state and the laminate is then cooled while removing the curvature to relieve stress in the laminate. The outer conductor, of the coaxial conductor is thus stress free and the impedance of the conductor remains constant with time. General layout, Figs. 1 and 2.-Copper tape 69, steel tape 71 and an intermediate strip 60 of adhesive polymer drawn from supply positions are fed to an aligning and laminating apparatus 74. Simultaneously, wire to form the central conductor for a supply 76 is drawn down in apparatus 78 and then fed to a device 80 where insulating discs 54 are applied to it. The laminate, having been corrugated by a device 81 is then associated with the central conductor and insulating discs to be fed to a tube forming and soldering station 82. The finished cable is drawn through the apparatus by a capstan 84 and is wound up at 86. Laminating device, Figs. 3 and 5.-Copper strip 69, steel strip 71 and adhesive polymer strip 60 are passed to an aligning device 90 and are then passed through three pairs 74 of heated presser rolls for bonding. Each roller pair comprises a fixed, driven lower roller 116 and an upper roller 114 which is mounted in vertically movable bearings subjected to the pressure of air piston-cylinder devices 122 the air pressure in pistons 122 being adjustable. Each roller has internal cavities 124 in which cartridge heaters 130 has placed, connection to the heaters being made through slip rings 134, 136. Gears 142, 144 drivingly connect the rollers to ensure identical speed of each roller. After leaving the last roller pair and while it is still at a temperature such that the plastics adhesive is flowable the laminate is passed over a roller 146 having a surface which is of spherical section. After leaving roller 146 the laminate cools and passes about a roller 147 in flat, stress relieved form. Wire drawing machine. Fig. 9.-An ultrasonically vibrated wire