| 摘要 |
1,216,221. Cladding wireJointing by rolling; welding by pressure. TEXAS INSTRUMENT Inc. 4 April, 1968 [26 April, 1967], No. 16267/68. Headings B3A, B3M and B3R. An apparatus for making a copper clad aluminium core comprises a capstan 11 for drawing the aluminium core A e.g. rod, tube, wire, through a die 9 and grooved rolls 1 to pull the core from the capstan at a pulling speed less than that of the capstan to reduce back tension and for solid phase bonding copper strips C around the core. After drawing the aluminium core A 5-30% reduction in area, it is passed through a guide sleeve 19 around which is rotatable a plurality of cutting tools 23 which removes any surface contamination. The core is further cleaned by a shaving die 27 after which it is passed through a chamber 29 containing a hydrogen atmosphere and to the nip of the grooved rolls 1. Each copper strip C is moved through a cleaning apparatus 35 and is electrically heated to 1000-1250‹ F. between points 39 and 41 to burn off volatiles, &c. on the strip surface and to reduce any oxides during its travel through the chamber 29. The point 41 may alternatively be positioned at an idler roll 33 or at the rolls 1. The copper strips are bonded about the aluminium core, the temperature of the composite being 450-550‹ F. as it leaves the rolls 1. The scrap 45 is subsequently removed. The composite may contain 10%, 15% or 20% by volume of copper. When the core A is bonded with thin sheets of copper, the grooves of the rolls are so shaped that thicker portions (M) (Fig. 4, not shown) of copper are formed adjacent the join zones 43. |
