| 摘要 |
Heat exchanger tube is made from a commercial blank in a single pass on a conventional tube finning machine. A series of discs are mounted on a tool arbor in engagement with the tube passing through the machine. The discs are arranged so that alternating deep grooves(18) and shallow grooves(16) are first formed in the outer surface. Then a flaring disc is applied to the shallow groove to force the fins(24) toward over the deep grooves forming the gapped cavity(30) between adjacent ridges. The arbor & the three tools make rolling engagement with the tube which is forced to rotate with the assembly. The arbor axis is slightly inclined to the tube axis.
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