There is provided a method for identifying thrust counterforce working point positions of backup rolls of a rolling mill, the method including: changing at least either friction coefficients and inter-roll cross angles between the rolls with an unchanged kiss roll load to cause thrust forces at a plurality of levels to act between the rolls, and measuring thrust counterforces in a roll-axis direction acting on rolls forming at least one of roll pairs other than a roll pair of the backup rolls and measuring backup roll counterforces acting in a vertical direction on the backup rolls at reduction support positions in a kiss roll state; and identifying, based on the measured thrust counterforces, thrust counterforce working point positions of thrust counterforces acting on the backup rolls, using first equilibrium conditional expressions relating to forces acting on the rolls and second equilibrium conditional expressions relating to moments acting on the rolls.

The invention relates to a roll stand (2) for rolling, in particular cold-rolling, metal products, comprising at least one actuator (16) which can be actuated for actively damping vibrations in the roll stand (2), and at least one supporting roll (10) which is non-adjustable or can be adjusted exclusively via a readjusting device for pass line adjustment (13) of the roll stand (2) for supporting a working roll (5) and/or intermediate roll of the roll stand (2), wherein the supporting roll (10) is guided at the ends via a respective bearing unit (11) on a rack (8) of the roll stand (2). In order to enable an optimal active damping of vibrations in a roll stand (2) of this type with low engineering effort, the invention proposes that the supporting roll (10) is supported on the actuator (16) via at least one bearing unit (11) and that the actuator (16) is supported on a section (17) of the rack (8) either directly or indirectly via at least one component (14) of the readjustment device (13).

The present invention discloses a rolling-bulging forming hydraulic machine for tubular products, which includes a frame. The frame is provided with an upper rolling mechanism, a lower rolling mechanism, a fixed liquid bulging hydraulic cylinder and a movable liquid bulging hydraulic cylinder. The upper rolling mechanism and the lower rolling mechanism are arranged oppositely, and the upper rolling mechanism and the lower rolling mechanism are used to roll surfaces of a to-be-machined tubular product. The fixed liquid bulging hydraulic cylinder and the movable liquid bulging hydraulic cylinder are arranged oppositely, and the fixed liquid bulging hydraulic cylinder and the movable liquid bulging hydraulic cylinder are used to perform hydraulic bulging on the to-be-machined tubular product.

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 rolling mill stand has two working rolls forming a roll gap in which a rolled product transported in a conveying direction can be formed. The positioning of at least one working roll is variable in a plane perpendicular to the conveying direction. The rolling mill is used in a method which comprises: conveying the rolled product through the roll gap in the conveying direction and at the same time opening or closing the rolling mill stand by correspondingly increasing or decreasing the roll gap; during opening or closing of the roll stand, detecting a position of the rolled product in front of and/or behind the roll gap in the direction transverse to the conveying direction; and changing the positioning of the corresponding working roll depending on the detected position, so that the rolled product is stabilized at a target position during opening or closing of the roll stand.

Disclosed is a rolling mill for a metal strip, including: a holding cage; an assembly of superimposed rolls with substantially parallel axes, including lower and upper working rolls, defining the gap for passage therethrough, and two respectively lower and upper supporting rolls respectively applied to the working rolls on the opposite side to that of the gap, each roll having two rotatably mounted ends, each on a bearing carried by a chock; and a system for clamping the chocks of the working rolls along the axis of the roll, while allowing the chocks to slide along a guide, following the clamping plane including a mechanical unit using the closing movements of the holding cage in order to switch from a retracted position, allowing the withdrawal, along the axis thereof, of the working rolls out of the holding cage, into a locking position, ensuring locking of the chocks.

Disclosed is a rolling method for rolling a strip including: rolling the strip by a pair of working rolls; transmitting a rolling force to the working rolls by a pair of support rolls; holding each of the working rolls by a pair of side support rollers; supporting each side support roller by two rows formed by rollers; supporting each row formed by the rollers, by a bearing support carrying rollers, the bearing support mounted pivotally on an articulation axis. The dimensions of a first interspace between the side support roller and the support roll and a second interspace between the strip and the assembly consisting of side support roller and bearing support vary in the course of the rolling. The method includes adjusting the dimension separating the axis of the support roll and the axis of the side support roller defining the first interspace.

A rolling mill facility includes: a support part extending along a plate width direction of a steel plate to be rolled; a thickness measurement part supported by the support part and configured to measure a thickness of the steel plate; and a heating part supported by the support part at positions at both sides across the thickness measurement part in the plate width direction and configured to heat both edge portions of the steel plate.

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.

Rolling stand for oblong metal products comprising a plurality of rolling rolls (11) each installed on a respective rotation shaft (12). Between at least one rotation shaft (12) and the respective rolling roll (11), a coupling member (15) is provided and is configured to couple the rolling roll (11) and the rotation shaft (12) to each other. The coupling member (15) comprises a tubular body (16) interposed between the rolling roll (11) and the rotation shaft (12) and provided with a chamber (17) in which a deformer element (18) is inserted mobile.