Skew rolling mill for reducing solid and hollow cross-sections

A skew rolling mill for reducing solid or hollow stock, comprising a stand;

• a hollow shaft rotatably supported by the stand and adapted to permit the passage of the rolled stock therethrough;
• a driven roll support rotatable about said shaft;
• three driven, tapered working rolls mounted on said roll support, which are inclined relative to the axis of the rolled stock, are offset from one another by 120.degree. and can be adjusted relative to the rolled stock axis;
• working roll support shafts mounted on said support and rotatably carrying said rolls, and of which the axes cross the rolled stock axis at short distances;
• intermediate shafts associated with said support shafts;
• bevel gears drivingly coupling each intermediate shaft to an associated support shaft;
• intermediate gears on said intermediate shafts;
• a sun gear disposed on the rotatable hollow shaft;
• planet gears meshing with said sun gear and with respective said intermediate gears, whereby the ratio between the working roll speed and the speed of rotation of the roll support can be controlled by rotation of the said sun wheel, so that the rolled stock will pass through the rolling mill without itself being rotated;
• each working roll together with its support shaft, the associated intermediate shaft and the associated bevel gears and intermediate gear, and a casing therefor, being combined to form a roll head, the roll heads being mounted on the roll support so as to be pivotable about axes which are parallel with the rolled stock axis, for adjusting the shaft angle between the roll axis and the rolled stock axis;
• characterised in that each roll head casing is constructed as a rocker which is provided with pivot means about which it is pivotable relative to the axes of the sun wheel, the planet gears and intermediate gears in a normal plane which is parallel with the end face of the roll support, and guide means are provided for supporting the pivot means of said rocker which guide means extends perpendicularly to the common plane of the axes of the respective intermediate gear supported by said rocker and the associated planet gear, the axis of the said pivot means being outside the axis of the associated intermediate gear and being at least approximately in the common plane of the axes of said intermediate gear and the associated planet gear, the pivot means being thereby adjustable to both sides of the said common plane of the axes within narrow limits to maintain meshing of the intermediate gear with the planet gear.