| 摘要 |
A tube rolling mill having two sets of three rolls each which are reciprocatingly driven along a length of a tube supported by a mandrel. Each roll is forced against the tube by individual cams that each have a surface of one or more tapers to provide controlled reduction in wall thickness of the tube. The mandrel is tapered to provide a reduction of inside tube diameter and is of a configuration to cause the inside wall of the tube to be shaped as for example in hexagonal form, simultaneously as the inside tube diameter and wall thickness are reduced. Various inside wall configurations may be produced such as clover leaf shapes, flat sided configurations, ovals, and a combination of circular and flat surfaces, each of the patterns running for the length of the finished tube.
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