| 摘要 |
Apparatus and method for forming fins on a tube surface. The apparatus comprises a plurality of roller assemblies and each roller assembly includes first and second spaced apart sets of discs. The first set of discs have progressively increasing outside diameters in a forward direction. The second set of discs includes a first subset of discs having outside diameters generally equal to the outside diameter of the forwardmost disc in the first set, and a second subset of discs having progressively increasing outside diameters in the forward direction, with the outside diameter of the forwardmost disc in the second subset generally equal to the outside diameter of the forwardmost disc in the first set.
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