EP4360773A1 - Walzwerk mit elektromagnetischen aktuatoren - Google Patents

Walzwerk mit elektromagnetischen aktuatoren Download PDF

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Publication number
EP4360773A1
EP4360773A1 EP23205989.9A EP23205989A EP4360773A1 EP 4360773 A1 EP4360773 A1 EP 4360773A1 EP 23205989 A EP23205989 A EP 23205989A EP 4360773 A1 EP4360773 A1 EP 4360773A1
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EP
European Patent Office
Prior art keywords
ring
rolling mill
linear axis
electromagnetic actuator
conical rollers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23205989.9A
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English (en)
French (fr)
Inventor
Nicola Lioce
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hts Srl
Original Assignee
Hts Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hts Srl filed Critical Hts Srl
Publication of EP4360773A1 publication Critical patent/EP4360773A1/de
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length

Definitions

  • the present invention refers to a rolling mill, in particular a ring- and/or disc-type rolling mill, equipped with electromagnetic actuators.
  • Ring-type rolling mills are machines with high technological content and are widely used and widespread throughout the world.
  • the mechanical characteristics of the hot rolling mill supported by a latest generation and precise electro-hydraulic system, allow obtaining rings with minimal tolerances; in some cases, where the process is consolidated, it will be possible to do without calibration, an operation that allows increasing the mechanical precision of the pieces produced.
  • the objective of hot rolling mills for rings is to make the structure of the starting material, precisely the one to be rolled, more tenacious for extreme uses, having the need for the shape to be made, an obligation to choose the final shape, in order to facilitate their use.
  • the present invention is applied to the family of rolling mills for hot deformation, justifying the choice of using electromagnetic actuators since, given that the transformation must be carried out hot, the temperatures involved are close to 1,200 °C, and the electro-magnetic actuator completely eliminates the risk of fire, having as a fundamental characteristic the absence of hydraulic oil, as well as leading to a drastic reduction in environmental pollution.
  • Ring rolling machines are anything but simple machines, precisely for this reason: ring rolling mills are the most complicated iron and steel machines, and this characteristic makes them objects of innovation and test benches for hydraulic technological innovations. All manufacturers of hydraulic components look at the ring rolling mill with the aim of making it simple to use and ecological: this objective is achieved with the use of electro-magnetic actuators.
  • this solution allows the possibility of drastically eliminating the risk of fire, and intrinsically provides the safety function in the event of fail-safe: in fact, this type of actuator has an internal position measurement system directly connected to the axis to be moved, thus allowing continuous monitoring.
  • the electromagnetic actuator has a positioning resolution in the micron range, giving the ring mill the numerical control function; furthermore, its torque control offers the possibility, in case of roughness of the blank, to absorb shocks without damaging the mechanics of connection to the tool to be deformed. Last, but not least, a contact is absent between the mobile part and the fixed part of the actuator, with only the necessary energy being used without dispersion: this makes it reliable and repeatable.
  • the object of the present invention is providing a rolling mill for rings and/or discs with at least one first electromagnetic axis of operational movement controlled by at least one linear electromagnetic actuator in a precise and position controllable manner.
  • the invention concerns machines for the hot rolling of ferrous and non-ferrous materials of a circular shape, for example rings and/or discs.
  • the ring-type rolling mill in question is made up of a cylindrical radial roller (1) set in rotation by an electric motor, connected to the radial roller (1) via a speed reducer; the radial roller (1) determines the rotation speed of the ring (6) to be rolled.
  • the external diameter of the radial roller (1) is determined taking into account the maximum peripheral speed of the ring (6) to be rolled and the maximum applicable torque.
  • the ring rolling mill is also made up of one or more conical rollers (2) called axial conical rollers.
  • the axial conical rollers (2) are installed opposite each other, when there are more than one: this antagonism serves to determine, by changing the distance of the conical rollers (2) between them, the height of the ring (6) to be rolled.
  • the axial conical rollers (2) are orthogonal to the radial rolling roller (1), and are effectively connected to a drive shaft which, at the opposite end, is connected to a speed reducer (not shown).
  • the speed reducer on its secondary shaft, is connected to electric motors which rotate the entire reduction system of the axial conical rollers (2).
  • the peripheral speed of the axial conical rollers (2) is determined by tracking the speed of the radial roller (1), and by the position of the ring (6) on the axial conical rollers (2).
  • the combination of the speeds of the radial roller (1) - axial conical rollers (2) has the objective of centering the ring (6) on the rolling table, as well as avoiding the screwing phenomenon, and the ascent of the ring (6) along the radial roller (1) during their rolling.
  • the ring rolling mill is also made up of other centering rollers (3) which rotate around first linear centering axes (5) and move radially with respect to the radial roller (1) and the ring (6).
  • the centering rollers (3) move on a circumferential arc independently of each other: by acting on the ring (6), they move it, bringing it to the center of the rolling table, facilitating the task of the axial conical rollers (2).
  • Their position corrects the speeds of the radial roller motors (1) with respect to the speed of the axial conical rollers (2); during rolling, the ring (6) crushed by the radial roller (1) but at the same time rotated, in an attempt to also be crushed in height by the axial conical rollers (2), moves from the center of the axes on the rolling table lamination.
  • the centering rollers (3) being radially supported on the ring (6) to be rolled, controlled in force, perceive, via torque sensors (not shown), the movement of the ring (6) in the two directions orthogonal to the ring (6): their retraction controls the speed of the axial conical rollers (2), which, by slowing down or accelerating compared to the speed of the radial roller (1), changes the center of the ring (6) to be rolled.
  • the axial conical rollers (2) have a conical shape in an attempt to keep the peripheral speed of the ring (6) constant; in fact, the ring (6) increases its external diameter as it grows, also changing the peripheral speed.
  • the ring (6) growing under the conical roller (2) encounters increasingly larger diameters of the axial conical roller (2), thus compensating for the change in speed of the ring (6) itself, and perfect synchronism, on a ring (6) in continuous growth, determines the centering of the ring (6) without having to resort to the use of centering rollers (3). Unfortunately, this is very difficult due to the dynamic nature of the process, while a fast lamination could be completed in just a few seconds.
  • the axial carriage (9) sets the axial conical rollers (2) in motion, moving axially with respect to the ring (6) via a linear axis; the axial conical rollers (2) thus change their contact position on the ring (6) to be rolled via the linear axis connected to the axial carriage (9).
  • the movement of the axial carriage (9), changing the position of the ring (6) on the conical rollers (2), affects the rotation speed of the ring (6), while the re-synchronization of the speeds occurs, as previously described, by the centering rollers (3) .
  • the radial roller (1) set in rotation by the reducer and the motor, has a mandrel (4) as an antagonist for the radial deformation of the ring (6) to be rolled.
  • the spindle (4) circular in shape, is set in motion via a second linear axis (5'); the axial movement of the mandrel (4) with respect to the rotating radial roller (1), but still in its position, causes the reduction of the space between the mandrel (4) and the radial roller (1) with consequent crushing of the ring section (6): this deformation causes the diameter of the ring (6) to grow, and thus, as described above, causes the diameter of the axial conical rollers (2) to grow, which determine the height of the ring (6) by moving backwards, controlled by a linear axis with the aim of having the ring (6) to be deformed always in its center and in the center of the rolling table.
  • the mandrel (4) which could be shaped to give the shape to the ring (6), is driven axially by a linear axis, and this allows the loading of the ring (6) to be rolled and the positioning to give the shape to the ring (6); the position of the spindle (4) on its axis is also maintained to keep the force on the lower spindle bearing assembly constant (not shown); furthermore, as described above, the ring (6), during growth, tries to screw onto the radial roller (1), causing an axial force on the mandrel (4) which is held in position with a linear axis, counteracting its movement.
  • the object of the present invention is providing a rolling mill for rings and/or discs with at least one first electromagnetic axis (5) of operational movement controlled by at least one linear electromagnetic actuator (10) in a precise and position controllable manner.
  • the linear electromagnetic actuator (10) must control at least the spindle axis (4).
  • the invention allows eliminating the connection by means of pipes for each first or second axis (5, 5') connected: therefore, the larger the first and/or second axes (5, 5') controlled by an electromagnetic actuator (10), the fewer connection pipes there will be to the ring and/or disc rolling mill, the greater the benefits will be, up to the complete elimination of the pipes, with consequent movement of all axes (5) via electromagnetic actuators (10), as can be clearly seen in Figure 3 .
  • the invention limits the risks linked to the possibility of fire and environmental pollution, by working the rolling mill with metal parts close to and above 1000 °C; furthermore, it brings the rolling mill to a state of modernization in line with the technologies of our time.
  • the work of compressing the metal is performed by electromagnetic actuators (10); these directly control the first and/or second axes (5, 5') limiting errors due to the compressibility of the process fluid and its variation in viscosity with temperature.
  • the electromagnetic actuators (10) are electrically driven servomotors with position and/or force control, and can also be used directly on the axis (5, 5') to be moved.
  • the solenoid is the most common of electric actuators. It is a device that converts an electrical signal into a linear movement caused by an electromagnetic field.
  • the solenoid consists of a coil and a core that can move freely or mechanically constrained to the part to be moved.
  • the moving part of the electromagnetic axis (5, 5'), as described, has no contact with the driving part of the axis (5, 5') itself. Consequently, the driving part remains fixed in the structure: this type of assembly allows the creation of static cooling systems and drastically simplifies the plant engineering of the ring-type rolling mill.
  • the cooling systems of the electromagnetic axes (5, 5') are small in size thanks to the high efficiency of the electromagnetic axis (5, 5') itself.
  • the invention on the ring mill improves maintainability, increasing health at work, eliminating pipes to maintain.
  • the starting torques of the electromagnetic actuators (10) are very high due to the total absence of contact and the possibility of delivering the same power in an infinitesimal time; the weight reduction due to the absence of contact drastically reduces the starting torque.
  • the starting torque is precisely the result of the weight to be moved and the mechanical friction.
  • the electromagnetic actuator (10) has reduced weight and zero contact with the driving part. Due to its dynamism, the electromagnetic actuator (10) can reach displacement speeds close to 7 meters per second: such high speeds are impossible to reach with mechanical systems of any type, and these speeds, together with the high starting torque, make the electromagnetic actuator (10) the most performing actuation system currently invented.
  • the ring-type rolling mill a high-performance machine due to the need to track the growth of the ring (6) to be rolled, takes advantage of the aforementioned peculiarities, improving productivity with a consequent reduction in consumption and increased respect for the environment.
  • the electromagnetic actuator (10) is the lightest actuator invented. Suffice it to say that the embodiments applied on a ring-type rolling mill always start from an electric motor arriving at a cylinder or a reducer, all useless weight.
  • the electromagnetic actuator (10) has its drive directly connected to electrical energy, exploiting the principle of the Faraday-Neumann law. These laws have been known in the state of the art since 1831.
  • the invention therefore allows, thanks to the elimination of mechanical components, to reduce the weight of the actuator (10) by 30% compared to any actuator known to the state of the art.
  • the ring rolling mill moved by electromagnetic actuators (10) is therefore overall lighter than any version with the same mechanical characteristics: less weight translates into less waste of energy for moving masses that are not useful for the process.
  • the electromagnetic actuator (10) unlike hydraulic or mechanical actuators, has no connection and motion transmission systems that must pass through reducers, screws and/or cylinders; the electromagnetic actuators (10) are in themselves cylinders powered by the Faraday-Neumann law, and the absence of mechanical connections and transmissions drastically reduces their dimensions. The reduction in size also causes a reduction in weight and therefore overall dimensions of the ring rolling mill, thus favoring the ergonomics of the ring rolling mill itself.
  • the invention provides reduced weights, absence of mechanical contact, to obtain quality rolled rings (6) and thus avoid reworking; as known from the state of the art, acceleration is inversely proportional to mass and friction, and the invention allows high accelerations to be applied so as to react quickly to variations in the process.
  • the invention Due to the absence of mechanical contact and the direct actuation without intermediate drive and/or mechanical connections, the invention is extremely reliable, given that the electronic control of the magnetic actuator allows the control of the variables to the point of being subject of predictive maintenance in a native way, without therefore adding any sophistication to implement it.
  • the electromagnetic actuator (10) applied to the ring-type rolling mill drastically reduces maintenance, simply using: native predictive maintenance due to the absence of mechanical contact; electronic maintenance reduced to a minimum, given that the integrated retraction components make it immune or almost maintenance-free.
  • the components that replace the invention are mainly electronic. As known from the state of the art, electronic components are the least subject to maintenance.
  • One of the objects of the invention is to provide a dangerous and hostile sector with a drive which has the peculiarity of being free from sparks, oil content for fire risk, absence of sliding to avoid wear due to dirt and dust, simplicity of use, absence of pipes to avoid splashes and leaks: the invention accomplishes all this thanks to its mechanical simplicity and its reduced electronic part.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
EP23205989.9A 2022-10-31 2023-10-26 Walzwerk mit elektromagnetischen aktuatoren Pending EP4360773A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202200022383 2022-10-31

Publications (1)

Publication Number Publication Date
EP4360773A1 true EP4360773A1 (de) 2024-05-01

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EP23205989.9A Pending EP4360773A1 (de) 2022-10-31 2023-10-26 Walzwerk mit elektromagnetischen aktuatoren

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR568815A (fr) 1922-07-24 1924-04-02 Adolf Kreuser Table de levage pour laminoirs à bandages
SU698710A1 (ru) 1977-09-22 1979-11-25 Московское Ордена Ленина И Ордена Трудового Красного Знамени Высшее Техническое Училище Им. Баумана Способ изготовлени кольцевых деталей и устройство дл его осуществлени
DE3824856A1 (de) 1987-09-01 1990-01-25 Kyoei Seiko Co Vorrichtung zur ring-formgebung
EP3300814A1 (de) 2016-09-30 2018-04-04 Forge Pat GmbH Walzwerk mit formrollen, und steuerungsverfahren für die position einer rolle eines solchen walzwerks
US20200261962A1 (en) 2017-09-08 2020-08-20 Schuler Pressen Gmbh Radial/axial ring rolling mill for rolling a ring

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR568815A (fr) 1922-07-24 1924-04-02 Adolf Kreuser Table de levage pour laminoirs à bandages
SU698710A1 (ru) 1977-09-22 1979-11-25 Московское Ордена Ленина И Ордена Трудового Красного Знамени Высшее Техническое Училище Им. Баумана Способ изготовлени кольцевых деталей и устройство дл его осуществлени
DE3824856A1 (de) 1987-09-01 1990-01-25 Kyoei Seiko Co Vorrichtung zur ring-formgebung
EP3300814A1 (de) 2016-09-30 2018-04-04 Forge Pat GmbH Walzwerk mit formrollen, und steuerungsverfahren für die position einer rolle eines solchen walzwerks
US20200261962A1 (en) 2017-09-08 2020-08-20 Schuler Pressen Gmbh Radial/axial ring rolling mill for rolling a ring

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