Skew-rolling mill for reducing solid and hollow cross-sections

Abstract

A skew-rolling mill for reducing solid or hollow cross-sections, in which a roll carrier and a first hollow shaft rotatably mounted therein and allowing passage of the rolled stock are supported rotatable independently of each other in a stand. The roll carrier comprises three driven conical working rolls inclined to the rolled stock axis and mounted circumferentially spaced at 120.degree. intervals and adjustable with respect to the rolled stock axis. The shafts carrying the working rolls, whose axes cross the rolled stock axis at short distances apart, are each drivably connected to an intermediate shaft by way of a respective bevel gear pair. Each intermediate shaft also carries a spur gear which acts as an intermediate gear wheel and is engaged by way of a respective planet pinion with a sun wheel which is mounted on one end of the first hollow shaft and can be rotated in such a manner as to control the relationship between the roll rotational speed and the roll carrier rotational speed so that the rolled stock passes through the rolling mill without rotating. The roll carrier extends in the form of a second hollow shaft which is supported in two positions in the stand, and through which the first hollow shaft passes being supported in the second hollow shaft at both ends thereof. The other end of the first hollow shaft projects from the second hollow shaft and is connected in a non-rotatable manner to a drive gear wheel.