| 摘要 |
A tool (10, 100) is provided for working a shaped metal tube (12), such as a square or rectangular metal tube, having a hollow interior and an outer surface to produce an end reduction in the tube. The tool (10, 100) includes a head (30, 116) having a longitudinally extending interior cavity (32, 120) and a plurality of roller cavities, each communicating with the interior cavity. A plurality of grooved rollers are rotatably mounted within the head, one within each of the roller cavities. Each of the grooved rollers has a preiphery (54) extending into the interior cavity and configured to engage a portion of the outer surface of the tube to be reduced, such as a corner portion (18). Depending upon the shape of the tube being reduced, the tool may further include a pair of flat-area rollers (132). The flat-area rollers may be used to engage the relatively long sides of a rectangular tube (102). The tool further includes a mandrel (64, 134) disposed within the interior cavity of the head. The mandrel being effective for preventing the tube from collapsing as a result of the end reduction.
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