Metal fusion bonding – Process – With shaping
Patent
1974-11-11
1976-07-13
Smith, Al Lawrence
Metal fusion bonding
Process
With shaping
228 175, 228110, 228 1, B23K 3102, B23K 106
Patent
active
039689182
ABSTRACT:
A method and apparatus for producing continuous lengths of coaxial products, such as coaxial cable, having concentric inner and outer conductors or other members, and an intermediate layer of dielectric or insulating material between the inner and outer members. A continuous length of the inner member is continuously advanced while a concentric layer of insulating material is continuously formed on the outer surface of the inner member, with the radial thickness of the insulating layer increasing in the machine direction in a predetermined zone traversed by the continuously advancing inner member. A continuous flat metal strip is continuously advanced alongside the inner member and is formed into an outer member surrounding the inner member, after which the longitudinal edge portions of the rolled strip are joined before the insulating material reaches its maximum radial thickness. Consequently, the outer member is completed to enclose the inner member and insulating material when the insulating material reaches its maximum radial thickness. The longitudinal edge portions of the metal strip are preferably joined by overlapping them and forming a lap seam by ultrasonic welding. The metal strip is preferably formed into the desired outer conductor by rolling it around the outer surface of an extrusion nozzle through which the inner member is passed while extruding expandable plastic material onto the inner member, with an anvil mounted on the end of the extrusion nozzle to form an ultrasonic welding station for joining the edge portions of the metal strip before the plastic material on the inner conductor expans to its maximum thickness.
REFERENCES:
patent: 3229012 (1966-01-01), Garner
patent: 3360850 (1968-01-01), Avila
Andrew Corporation
Joyce Margaret
Smith Al Lawrence
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