Metal plastic forming processes and equipment that provides a flexible skew rolling mill with dual-rotatable-shafts, including a base unit, a guide unit, two rollers, two servo main-shaft systems, a roller distance adjusting mechanism, two tilt angle adjusting mechanisms, a cooling system and a numerical control system. The two servo main-shaft systems are mounted under the support of the two beds, thereby driving the two rollers to do rotation motion; the roller distance adjusting mechanism drives the two beds, thereby enabling the two rollers to do synchronous centering and radial feed motion; the two tilt angle adjusting mechanisms drive the servo main-shaft systems respectively to rotate around a horizontal rolling center line and enable the two rollers to do tilt angle adjustment motion; and the numerical control system controls a rotating speed, radial feed and tilt angle adjustment of the two rollers, such that skew rolling mills and rollers of the same dimensions and specification can form shaft parts of different dimensions and specifications by flexible skew rolling. The flexible skew rolling mill with dual-rotatable-shafts has the advantages that the beds are synchronously centered and radial feed, the strength of the beds is high, the mounting and debugging are convenient, flexible production can be realized and the like such that the flexible skew rolling mill has broad prospects of being applied to the field of forming large-diameter shaft parts with diversified specifications.

The present invention relates to a cross rolling method having the step of shaping a component blank rotating about a main axis of rotation by means of at least two cross rolling tools located substantially opposite each other with respect to the component blank for the production of a component (1, 2) that is at least partly non-rotationally symmetrical and non-cyclically symmetrical with respect to the main axis of rotation, by moving the cross rolling tools along their main direction of movement. The invention also relates to a cross rolling tool for producing an at least partly non-rotationally symmetrical and non-cyclically symmetrical component (1, 2). Likewise, the present invention relates to an apparatus for carrying out the method according to the invention and a component (1, 2) produced in accordance with the method according to the invention.

The present invention provides a method for identifying an inter-roll cross angle in a rolling mill of four-high or more including at least a pair of work rolls and a pair of backup rolls by, when rolling is not performed, applying a roll bending force to apply a load between rolls of an upper roll assembly including the work roll on the upper side and between rolls of a lower roll assembly including the work roll on the lower side, in a state where a roll gap between the work rolls is put into an open state, detecting vertical roll loads that act in the vertical direction on the rolling support positions on the working side and the driving side of at least one of the backup roll on the upper side or the backup roll on the lower side, and calculating a load difference between the vertical roll loads on the working side and the driving side.

A method for setting a rolling mill, the method being executed before reduction position zero point adjustment or before the start of rolling, and including: a first process of setting rolls in an open state, and with respect to each of the upper roll assembly and the lower roll assembly, adjusting positions of roll chocks in a rolling direction based on a torque acting on the work roll or a vertical roll load difference; and a second process of, after the first process, setting rolls in a kiss roll state, measuring a vertical roll load in two rotational states on a work side and a drive side, and moving roll chocks of a roll assembly on the opposite side to a reference roll simultaneously and in a same direction so that the vertical roll load difference falls within an allowable range to thereby adjust the positions of the roll chocks.

A rolling mill of four-high or more is provided that includes: measurement apparatuses that adopt any one roll as a reference roll, and measure at least rolling direction forces acting on roll chocks on a work side and roll chocks on a drive side of each roll other than a backup roll; pressing apparatuses that press the roll chocks in the rolling direction; driving apparatuses that move the roll chocks in the rolling direction; and a position control unit that fixes a rolling direction position of the roll chocks of the reference roll as a reference position, and drives the driving apparatuses to control the positions in the rolling direction of the roll chocks based on a rolling direction force difference so that the rolling direction force difference of each roll is a value within an allowable range.

A method for setting a rolling mill, the method being executed before reduction position zero point adjustment or before the start of rolling, and including: a first process of setting rolls in an open state, and with respect to each of the upper roll assembly and the lower roll assembly, adjusting positions of roll chocks in a rolling direction based on a torque acting on the work roll or a vertical roll load difference; and a second process of, after the first process, setting rolls in a kiss roll state, measuring a vertical roll load in two rotational states on a work side and a drive side, and moving roll chocks of a roll assembly on the opposite side to a reference roll simultaneously and in a same direction so that the vertical roll load difference falls within an allowable range to thereby adjust the positions of the roll chocks.

Metal plastic forming processes and equipment that provides a flexible skew rolling mill with dual-rotatable-shafts, including a base unit, a guide unit, two rollers, two servo main-shaft systems, a roller distance adjusting mechanism, two tilt angle adjusting mechanisms, a cooling system and a numerical control system. The two servo main-shaft systems are mounted under the support of the two beds, thereby driving the two rollers to do rotation motion; the roller distance adjusting mechanism drives the two beds, thereby enabling the two rollers to do synchronous centering and radial feed motion; the two tilt angle adjusting mechanisms drive the servo main-shaft systems respectively to rotate around a horizontal rolling center line and enable the two rollers to do tilt angle adjustment motion; and the numerical control system controls a rotating speed, radial feed and tilt angle adjustment of the two rollers, such that skew rolling mills and rollers of the same dimensions and specification can form shaft parts of different dimensions and specifications by flexible skew rolling. The flexible skew rolling mill with dual-rotatable-shafts has the advantages that the beds are synchronously centered and radial feed, the strength of the beds is high, the mounting and debugging are convenient, flexible production can be realized and the like such that the flexible skew rolling mill has broad prospects of being applied to the field of forming large-diameter shaft parts with diversified specifications.

The present invention provides a method for identifying an inter-roll cross angle in a rolling mill of four-high or more including at least a pair of work rolls and a pair of backup rolls by, when rolling is not performed, applying a roll bending force to apply a load between rolls of an upper roll assembly including the work roll on the upper side and between rolls of a lower roll assembly including the work roll on the lower side, in a state where a roll gap between the work rolls is put into an open state, detecting vertical roll loads that act in the vertical direction on the rolling support positions on the working side and the driving side of at least one of the backup roll on the upper side or the backup roll on the lower side, and calculating a load difference between the vertical roll loads on the working side and the driving side.