| 摘要 |
940,924. Making composite metal strip for bearings. REPCO Ltd. Oct. 24, 1961 [Nov. 7, 1960], No. 38062/61.Heading B3A. A method of making a composite metal strip comprises, roll bonding a strip of aluminium-tin alloy to a strip of tin-free or substantially tinfree aluminium or aluminium alloy by a reduction in thickness during the first pass and roll bonding the tin free face of the duplex strip formed to a steel strip by a reduction in the first pass, each bonding face being suitably prepared prior to rolling, all bonding operations being carried out at ambient temperatures. In an example an aluminium ingot, 30% tin, 0.7 copper, remainder aluminium, is machined flat, rolled to a thickness of 0.3 inch and roll bonded to a 0.06 inch thick strip of pure aluminium by reducing it to 0.16 inch in a single pass. The composite sheet is further rolled to 0.04 inch and roll bonded to a steel strip by reducing it to 0.07 inch in a single pass. All the bonding faces are scratch brushed and the final strip annealed at 350‹ C. for half an hour. To avoid loss of tin by sweating during intermediate annealing an additional layer of tin-free aluminium may be bonded to the face of the aluminium tin strip. The steel strip may have multi-layer aluminium strips bonded on both sides. The composite strip may be used for shell bearings or bushes. Specifications 706,149, 749,529, 762,817 and 798,360 are referred to. |
