A stretch reducing rolling mill for rolling pipes has a plurality of roll stands arranged in series in a conveying direction of a pipe. A wall thickness measuring device determines a wall thickness progression of the pipe prior to rolling. A control unit controls respective rotational speeds of the roll stands. A pipe position measuring device is arranged in front of the roll stands and continuously measures a current longitudinal coordinate of the pipe. The measured values of the longitudinal coordinate of the pipe are transmitted to the control unit. The control unit controls the rotational speeds of the roll stands based on both the determined wall thickness progression and the transmitted measured values of the current longitudinal coordinate of the pipe, in order to compensate for wall thickness variations of the pipe. A stretch reducing rolling mill is designed to carry out the method.

A rolling mill system for Incremental rotary shaping of an elongated workpiece is provided that includes first and second workpiece holders. A support frame has a track with the first and second workpiece holders being movably associated with the track, the workpiece holders and an associated workpiece being movable in unison along the track. A radial chuck is mounted to the frame that includes a plurality of jaws that are movable radially inwardly and outwardly. Each jaw has a tool mounted thereto that is rotatable about an axis of rotation, with the axis of rotation of each tool being oriented at a skew angle relative to the longitudinal axis of a workpiece. A source of electric current and an electrically conductive flow path are provided for flowing electrical current through a workpiece. A controller is provided that is configured to control the operation of each of the first motor, second motor and third motor, and to control the flow of current flowing through the tools to the workpiece.

A rolling mill system for Incremental rotary shaping of an elongated workpiece is provided that includes first and second workpiece holders. A support frame has a track with the first and second workpiece holders being movably associated with the track, the workpiece holders and an associated workpiece being movable in unison along the track. A radial chuck is mounted to the frame that includes a plurality of jaws that are movable radially inwardly and outwardly. Each jaw has a tool mounted thereto that is rotatable about an axis of rotation, with the axis of rotation of each tool being oriented at a skew angle relative to the longitudinal axis of a workpiece. A source of electric current and an electrically conductive flow path are provided for flowing electrical current through a workpiece. A controller is provided that is configured to control the operation of each of the first motor, second motor and third motor, and to control the flow of current flowing through the tools to the workpiece.

A rolling mill has a rolling stand (1) in which a flat rolled product (2) composed of metal is rolled. A sensor device (6), which detects at least one measured variable (M) characteristic of a material property of the flat rolled product (2), is arranged upstream and/or downstream of the rolling stand (1). The material property can be, in particular, an electromagnetic property or a mechanical property of the rolled product (2). The sensor device (6) transfers the detected measured variable (M) to a control device (9) for the rolling mill. Taking into account the measured variable (M), the control device (9) determines a control value (A) for the rolling stand (1). The control of the rolling stand (1) influences the material property of the flat rolled product (2). The control value (A) is a ratio of the peripheral speeds (vO, vU) at which the upper and the lower working rolls (3, 4) of the rolling stand (1) rotate.

A rolling mill has a rolling stand (1) in which a flat rolled product (2) composed of metal is rolled. A sensor device (6), which detects at least one measured variable (M) characteristic of a material property of the flat rolled product (2), is arranged upstream and/or downstream of the rolling stand (1). The material property can be, in particular, an electromagnetic property or a mechanical property of the rolled product (2). The sensor device (6) transfers the detected measured variable (M) to a control device (9) for the rolling mill. Taking into account the measured variable (M), the control device (9) determines a control value (A) for the rolling stand (1). The control of the rolling stand (1) influences the material property of the flat rolled product (2). The control value (A) is a ratio of the peripheral speeds (vO, vU) at which the upper and the lower working rolls (3, 4) of the rolling stand (1) rotate.

A control apparatus of a tandem rolling mill includes a speed command output unit configured to temporarily output a speed command value to each of a plurality of stands before a tandem rolling mill is activated while in a state where a rolled material is sandwiched between the plurality of stands, and a Droop amount setting unit configured to set a Droop amount set value of the stand smaller toward rear stage of the plurality of stands, during a period in which the speed command output unit temporarily outputs the speed command value. Including the configuration makes it possible to more surely prevent rupture of the rolled material. The control apparatus of the tandem rolling mill makes it possible to more surely prevent rupture of a rolled material.

A control apparatus of a tandem rolling mill includes a speed command output unit configured to temporarily output a speed command value to each of a plurality of stands before a tandem rolling mill is activated while in a state where a rolled material is sandwiched between the plurality of stands, and a Droop amount setting unit configured to set a Droop amount set value of the stand smaller toward rear stage of the plurality of stands, during a period in which the speed command output unit temporarily outputs the speed command value. Including the configuration makes it possible to more surely prevent rupture of the rolled material. The control apparatus of the tandem rolling mill makes it possible to more surely prevent rupture of a rolled material.

The present invention provides a dynamic contact heat transfer simulation device for rolling heavy-load deformation zone. The device includes a control system, a data acquisition system, a pressure-adjustable fixed cold end, a rotating chuck, a temperature-adjustable heat-conducting rod and an speed-adjustable rotation hot end; the device utilizes the rotating chuck and the speed-adjustable rotating hot end to adjust the rotation speed in real time according to the actual rolling conditions, simulate the working conditions of the actual rolling heavy-load deformation zone, and accurately obtain the dynamic heat transfer coefficient of the rotating contact interface under variable load pressure conditions.

A rolling control device (10) updates a preset load value P.sub.set based on operation actual results at timings t.sub.a to t.sub.b. The rolling control device (10) derives a plasticity coefficient Q.sub.chk based on operation actual results at timings t.sub.b to t.sub.c. When the determining that it is necessary to re-update the updated preset load value P.sub.set based on the plasticity coefficient Q.sub.chk, the rolling control device (10) updates the preset load value P.sub.set again based on the operation actual results at the timings t.sub.b to t.sub.c.

A rolling control device (10) updates a preset load value P.sub.set based on operation actual results at timings t.sub.a to t.sub.b. The rolling control device (10) derives a plasticity coefficient Q.sub.chk based on operation actual results at timings t.sub.b to t.sub.c. When the determining that it is necessary to re-update the updated preset load value P.sub.set based on the plasticity coefficient Q.sub.chk, the rolling control device (10) updates the preset load value P.sub.set again based on the operation actual results at the timings t.sub.b to t.sub.c.