Abstract: A rolling mill for solid elongated products, defining a rolling axis, including first and second rolling stations. Each station includes a load-bearing structure, a removable roll-holder cartridge with three rolling rolls movable radially and rotating around spaced rotational axes, and a roll having a vertical rotational axis. A system synchronizes mechanical adjustment of the rolls. Three actuators mount on the load-bearing structure; three gear motor groups connect to the rolls by single extensions. The second station rolls are rotated 60° from the first stations. The rolls with a vertical axis of the first and second stations are arranged on opposite sides of the rolling axis. All rolling stations allow lateral extraction of roll-holder cartridges from the same side of the rolling mill. The stations on the extraction side have actuators movable relative to the load-bearing structure. The stations with vertical rolls arranged on the opposite side have fixed actuators.

Abstract: A device for handling mandrel rods in a rolling plant for rolling seamless tubes comprises an inserter. The inserter moves a mandrel rod in a rolling direction such that the mandrel rod, starting from an initial state, is pushed into a tube blank situated upstream of the mandrel rod. A retaining device has a fixing unit that is movable along the rolling line and is designed to temporarily hold the mandrel rod at an action point at a rear end of the mandrel rod and to carry out a working stroke. The mandrel rod can be inserted into the rolling mill in the rolling direction and pulled out of the rolling mill counter to the rolling direction by the retaining device. The retaining device is designed such that the starting position of the fixing unit lies between the two ends of the mandrel rod in the initial state.

Abstract: A rolling mill for solid elongated products, defining a rolling axis, including first and second rolling stations. Each station includes a load-bearing structure, a removable roll-holder cartridge with three rolling rolls movable radially and rotating around three equally spaced axes of rotation, and a roll having a vertical rotational axis. Three actuators mount on the load-bearing structure; three gear motor groups connect to the rolls by single extensions. The position of the second station rolls is rotated 60° from the first stations. The rolls with a vertical axis of the first and second stations are arranged on opposite sides of the rolling axis. All rolling stations allow lateral extraction of roll-holder cartridges from the same side of the rolling mill. The stations on the cartridge extraction side have actuators movable relative to the load-bearing structure. The stations with vertical rolls arranged on the opposite side have fixed actuators.

Abstract: A rolling mill for solid elongated products, defining a rolling axis, including first and second rolling stations. Each station includes a load-bearing structure, a removable roll-holder cartridge with three rolling rolls movable radially and rotating around three equally spaced axes of rotation, and a roll having a vertical rotational axis. Three actuators mount on the load-bearing structure; three gear motor groups connect to the rolls by single extensions. The position of the second station rolls is rotated 60° from the first stations. The rolls with a vertical axis of the first and second stations are arranged on opposite sides of the rolling axis. All rolling stations allow lateral extraction of roll-holder cartridges from the same side of the rolling mill. The stations on the cartridge extraction side have actuators movable relative to the load-bearing structure. The stations with vertical rolls arranged on the opposite side have fixed actuators.

Abstract: A rolling mill for solid elongated products, defining a rolling axis, including first and second rolling stations. Each station includes a load-bearing structure, a removable roll-holder cartridge with three rolling rolls movable radially and rotating around spaced rotational axes, and a roll having a vertical rotational axis. A system synchronizes mechanical adjustment of the rolls. Three actuators mount on the load-bearing structure; three gear motor groups connect to the rolls by single extensions. The second station rolls are rotated 60° from the first stations. The rolls with a vertical axis of the first and second stations are arranged on opposite sides of the rolling axis. All rolling stations allow lateral extraction of roll-holder cartridges from the same side of the rolling mill. The stations on the extraction side have actuators movable relative to the load-bearing structure. The stations with vertical rolls arranged on the opposite side have fixed actuators.

Abstract: The present invention relates to a plant 10 for rolling a seamless tube. The plant comprises a rotary piercer 20 which is designed to pierce a billet 11 pressed against a plug 22 mounted on a rod so as to obtain a pierced blank 12. The rod is connected to a thrust block 26 designed to oppose the axial thrust which is produced on the rod during piercing. The plant also comprises a longitudinal mill 30 which is designed to roll the pierced blank 12 on a mandrel 32 so as to obtain a semi-finished tube 13. The mandrel is connected to a retaining block 34 designed to impart to the mandrel a predetermined speed during rolling. In the plant according to the invention the thrust block 26 and the retaining block 34 are formed by a single thrust/retaining block 36. The invention also relates to a method for rolling a seamless tube.

Abstract: The present invention relates to a rolling mill 20 which defines a rolling axis X and comprises at least two rolling stations 22. At least one rolling station comprises a fixed structure 40, a roll-holder cartridge 24 and three actuators 32. The cartridge is connected removably to the fixed structure and comprises three rolling rolls 26. The rolls are movable radially and rotatable about three respective axes arranged at 120° from each other. The three actuators are mounted on the fixed structure and comprise pistons 50 movable along respective radial axes t arranged at 120° from each other. Each of the actuators is able, during use, to act on one of the rolls so as to impart a radial force suitable for rolling the article 44.

Abstract: The invention relates to a rolling mill defining a rolling axis and comprising rolling stations. At least one rolling station comprises a fixed structure, a roll-holder cartridge and three actuators. The cartridge is connected removably to the fixed structure and comprises three rolling rolls. The rolls are movable radially and rotatable about three respective axes. Three actuators of the single-stroke type are mounted on the fixed structure and comprise pistons movable along respective radial axes to impart a force on the rolls for rolling an article. Three gearmotors provide the rolls, by means of spindles, with the torque for feeding the article along the rolling axis. When two pistons are completely retracted, a path is created free from obstacles allowing the cartridge to pass out laterally. Then, one spindle may be subject to a rotation-translation to be removed from the path, the respective gearmotor being fixed on its base.

Abstract: The present invention relates to a roll-holder cartridge for a rolling mill 20. The cartridge 24 comprises two side walls 26, a plurality of roll-lever units 30, two adjusting rings 28 and an adjusting actuator 32. Each side wall of the cartridge comprises a plurality of first seats 260; each adjusting ring comprises a plurality of second seats 280; and each one of the roll-lever units is mounted on the cartridge so as to be able to pivot about a pin 300, each end of each pin being housed in the axial direction inside a first seat and a second seat, respectively. Moreover, the first seats allow a displacement of the respective pins in a purely tangential direction t; the second seats allow a displacement of the respective pins in a purely radial direction r, and the two adjusting rings may be rotated about the axis X by means of the adjusting actuator. The invention also relates to a rolling stand 22 comprising the cartridge described above and a rolling mill comprising a plurality of rolling stands 22.

Abstract: The invention relates to a rolling mill defining a rolling axis and comprising rolling stations. At least one rolling station comprises a fixed structure, a roll-holder cartridge and three actuators. The cartridge is connected removably to the fixed structure and comprises three rolling rolls. The rolls are movable radially and rotatable about three respective axes. Three actuators of the single-stroke type are mounted on the fixed structure and comprise pistons movable along respective radial axes to impart a force on the rolls for rolling an article. Three gearmotors provide the rolls, by means of spindles, with the torque for feeding the article along the rolling axis. When two pistons are completely retracted, a path is created free from obstacles allowing the cartridge to pass out laterally. Then, one spindle may be subject to a rotation-translation to be removed from the path, the respective gearmotor being fixed on its base.

Abstract: A re-turning plant for rollers of rolling mills of the type comprising at least one roller stand and a plurality of rollers mounted to respective arms pivoting in the plane of the roller stand about respective pins that are fixed to the roller stand. The rollers are positioned within the roller stand in a work position in which work surfaces of the rollers determine the outer profile of a body to be rolled. The re-turning plant comprises a support structure configured to support the whole roller stand in a turning position, a tool-holding device that can be displaced in contact with the work surfaces of each roller fixed in the roller stand and mandrel means with means that can be rotatably coupled to each roller of the plurality of rollers fixed to the roller stand to rotate the same substantially in the work position.

Abstract: The present invention teaches rolling a seamless tube, typically with a large diameter. The system comprises a furnace for heating billets produced by continuous casting. The system comprises a piercing mill for longitudinally piercing the heated billets to obtain a pierced blank. The system comprises an expanding-elongating mill for expanding the pierced blank diameter and for elongating the pierced blank to obtain a semi-finished tube. The system comprises a continuous main rolling mill with adjustable rolls for mandrel-rolling a semi-finished tube. The system comprises a fixed-roll extracting-reducing mill positioned downstream of the main rolling mill. The extracting-reducing mill extracts the semi-finished tube from the mandrel, reducing the diameter to a predetermined value close to that desired for the finished tube. The system comprises an adjustable-roll sizing mill to adjust the radial position of the rolls and define the diameter of the outgoing tube.

Abstract: A re-turning plant for rollers of rolling mills of the type comprising at least one roller stand and a plurality of rollers mounted to respective arms pivoting in the plane of the roller stand about respective pins that are fixed to the roller stand. The rollers are positioned within the roller stand in a work position in which work surfaces of the rollers determine the outer profile of a body to be rolled. The re-turning plant comprises a support structure configured to support the whole roller stand in a turning position, a tool-holding device that can be displaced in contact with the work surfaces of each roller fixed in the roller stand and mandrel means with means that can be rotatably coupled to each roller of the plurality of rollers fixed to the roller stand to rotate the same substantially in the work position.

Abstract: The present invention relates to a system and method for rolling a seamless tube. The plant comprises a main rolling mill with adjustable rolls for mandrel-rolling a semi-finished tube. The plant also comprises a fixed-roll extracting/reducing mill positioned downstream of the main rolling mill. The extracting/reducing mill is designed to extract the semi-finished tube from the mandrel and reduce its diameter to a predetermined value close to that desired for the finished tube. Finally, the plant comprises a adjustable-roll sizing mill. The sizing mill is positioned downstream of the extracting/reducing mill. This sizing mill is designed to adjust the radial position of the rolls and define the diameter of the outgoing tube.

Abstract: The present invention relates to a rolling mill 20 which defines a rolling axis X and comprises at least two rolling stations 22. At least one rolling station comprises a fixed structure 40, a roll-holder cartridge 24 and three actuators 32. The cartridge is connected removably to the fixed structure and comprises three rolling rolls 26. The rolls are movable radially and rotatable about three respective axes arranged at 120° from each other. The three actuators are mounted on the fixed structure and comprise pistons 50 movable along respective radial axes t arranged at 120° from each other. Each of the actuators is able, during use, to act on one of the rolls so as to impart a radial force suitable for rolling the article 44.

Abstract: A re-turning plant (1) for rollers (7) of rolling mills of the type comprising at least one roller stand (1) and a plurality of rollers (7) mounted to respective arms (6) pivoting in the plane of the roller stand (1) about respective pins (8) that are fixed to the roller stand (1), the rollers (7) being positioned within the roller stand (1) in a work position in which work surfaces (9) of the rollers (7) determine the outer profile of a body to be rolled, wherein the re-turning plant (1) comprises a support structure (12) configured to support the whole roller stand (1) in a turning position, a tool-holding device (13) that can be displaced in contact with the work surfaces (9) of each roller (7) of the plurality of rollers (7) fixed in the roller stand (1) and mandrel means (14) with means (15, 16) that can be rotatably coupled to each roller (7) of the plurality of rollers (7) fixed to the roller stand (1) to rotate the same substantially in the work position.

Abstract: The present invention relates to a system and method for rolling a seamless tube. The plant comprises a main rolling mill with adjustable rolls for mandrel-rolling a semi-finished tube. The plant also comprises a fixed-roll extracting/reducing mill positioned downstream of the main rolling mill. The extracting/reducing mill is designed to extract the semi-finished tube from the mandrel and reduce its diameter to a predetermined value close to that desired for the finished tube. Finally, the plant comprises a adjustable-roll sizing mill. The sizing mill is positioned downstream of the extracting/reducing mill. This sizing mill is designed to adjust the radial position of the rolls and define the diameter of the outgoing tube.

Abstract: The present invention relates to an edge-bending press (10) which comprises an upper platen (12), a lower platen (14) and operating actuators (16). The operating actuators (16) are designed to cause a relative movement of the upper platen (12) and lower platen (14) towards and/or away from each other. The press (10) also comprises an upper die-holder assembly (22) which is connected to the upper platen (12) and a lower die-holder assembly (24) which is connected to the lower platen (14). Each die-holder assembly comprises a right-hand die-holder (222, 242) and a left-hand die-holder (224, 241); thus there is an upper right-hand die-holder (222), an upper left-hand die-holder (224), a lower right-hand die-holder (242) and a lower left-hand die-holder (244). The press (10) also comprises adjustment actuators (18) designed to cause a relative movement of the right-hand die-holders (222, 242) and left-hand die-holders (224, 244) towards and/or away from each other.

Abstract: The present invention relates to a roll (26) for rolling a long semifinished article (18). The roll is rotatable about an axis of rotation (r) and comprises: a groove (44) able to reproduce a nominal arc (h) of the outer profile of the semifinished article; and a groove plane (?) which intersects, perpendicularly with respect to the axis of rotation, the roll along its smaller section. The roll is asymmetrical with respect to the groove plane (?). The invention also relates to a rolling station (22) and a continuous rolling mill (20) which comprise a plurality of such rolls. Finally, the invention relates to a method for reconditioning these rolls.

Abstract: A re-turning plant (1) for rollers (7) of rolling mills of the type comprising at least one roller stand (1) and a plurality of rollers (7) mounted to respective arms (6) pivoting in the plane of the roller stand (1) about respective pins (8) that are fixed to the roller stand (1), the rollers (7) being positioned within the roller stand (1) in a work position in which work surfaces (9) of the rollers (7) determine the outer profile of a body to be rolled, wherein the re-turning plant (1) comprises a support structure (12) configured to support the whole roller stand (1) in a turning position, a tool-holding device (13) that can be displaced in contact with the work surfaces (9) of each roller (7) of the plurality of rollers (7) fixed in the roller stand (1) and mandrel means (14) with means (15, 16) that can be rotatably coupled to each roller (7) of the plurality of rollers (7) fixed to the roller stand (1) to rotate the same substantially in the work position.