EP3095532B1 - Tensioning unit for rolling apparatuses - Google Patents
Tensioning unit for rolling apparatuses Download PDFInfo
- Publication number
- EP3095532B1 EP3095532B1 EP16169926.9A EP16169926A EP3095532B1 EP 3095532 B1 EP3095532 B1 EP 3095532B1 EP 16169926 A EP16169926 A EP 16169926A EP 3095532 B1 EP3095532 B1 EP 3095532B1
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- EP
- European Patent Office
- Prior art keywords
- unit
- tensioning
- support
- roll
- rolling
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
- B21B37/50—Tension control; Compression control by looper control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/02—Tension
- B21B2265/06—Interstand tension
Definitions
- the present invention concerns a tensioning unit for rolling apparatuses, used to detect and adjust the tension of strips or metal sheets in the interstand segment between two adjacent rolling stands.
- Tensioning units are known, used in hot rolling apparatuses for metal sheets, which are disposed in an intermediate position between two adjacent rolling stands, to detect and adjust the tension to which the strip or metal sheet being worked is subjected in the interstand segment.
- the tension of the strip or metal sheet is monitored with the purpose of conferring on the product the desired characteristics, and of reaching high standards of quality.
- characteristics such as the profile and planarity of the strip or sheet depend on correct and constant tension values being maintained throughout the rolling process, in particular in the interstand segments where the strip or sheet are not directly supported.
- Tensioning units comprising a tensioning roll mounted on a support and disposed in contact with the strip or sheet in the interstand segment between two adjacent rolling stands.
- the tensioning roll can be driven to interact with the strip or sheet in relation to the tension value detected, acting on a hydraulic motor positioned in axis with the support.
- the tension value of the strip or metal sheet is detected by load cells installed in proximity to the tensioning roll.
- the tension value of the strip or metal sheet can be obtained by reading the position and/or pressure of hydraulic command devices.
- a typical disadvantage of tensioning units for rolling apparatuses of the known type is that they require big spaces for installation, which significantly influences the distance between one rolling stand and the next.
- Another consequent disadvantage is that more energy is required to perform the same workings on the strip or metal sheet compared with what would be required by the same steps performed at higher temperatures.
- JP62156013 describes a tensioning unit having a contact roll disposed at the end of the shaft of a hydraulic cylinder with a substantially vertical axis, under which a tension detection element is disposed, in this specific case a load cell.
- US 5,718,138 describes a tensioning unit having a contact roll associated with a support arm connected to the shaft of a hydraulic cylinder, so as to define a desired height of the roll with respect to a lying plane of the strip or metal sheet.
- US'138 provides two methods to detect the tension of the strip, a first that uses a load cell generically associated with the tensioning unit, and a second that uses the value of the pressure of the hydraulic cylinder.
- one purpose of the invention is to obtain a tensioning unit which, installed in the interstand segment, allows to reduce the distance between two adjacent rolling stands compared with known tensioning units, so as to reduce to a minimum the lowering in temperature of the strip or metal sheet being worked.
- one purpose of the present invention is to obtain a tensioning unit that is compact and not bulky.
- Another purpose of the present invention is to obtain a tensioning unit that is precise and reliable, and in which the friction deriving from the sliding of moving parts is reduced.
- Another purpose of the present invention is to improve the accessibility of the measuring element of the tensioning unit in order to carry out the maintenance steps.
- Another purpose of the present invention concerns the possibility of replacing the tensioning roll of the tensioning unit when it is worn or ruined, without having to operate in proximity to the measuring element.
- Another purpose of the present invention is to position the measuring element far from the zone where the strip or metal sheet runs, because, since it is a sensitive element, it should preferably be placed somewhere sheltered from vibrations and dirt.
- one purpose of the present invention is to provide a tensioning unit that is simple and economical.
- the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
- a tensioning unit is provided for a rolling apparatus which includes at least one rolling stand.
- the tensioning unit comprises a contact unit which is provided with at least one tensioning roll configured to be taken to rest on and put under tension a strip or metal sheet, at least one actuation element to drive the contact unit, taking it into contact with the strip or metal sheet, and at least one detection unit to measure the forces to which the contact unit is subjected, and hence the tension of the strip or metal sheet.
- the contact unit, the actuation element and the detection unit are disposed one below the other, so as to define a main development of the column type of the tensioning unit, in this way obtaining a compact tensioning unit with a very limited lateral extension, such as to allow to position two adjacent rolling stands of a rolling apparatus close to each other.
- the contact unit is disposed on a support element rotatable around an axis lying on a plane substantially parallel to the lying and/or feed plane of the strip or metal sheet.
- the actuation element can be a linear actuator disposed vertical according to its greatest size, hence disposed during use substantially orthogonal to the lying and feed plane of the strip or metal sheet.
- the actuation element defines during use an angle other than zero with respect to the vertical of the strip or metal sheet.
- the tensioning unit includes at least one control unit configured to receive from the detection unit a signal relating to the value of tension of the metal strip or metal sheet advancing in one direction and/or another, between two adjacent rolling stands and acting on the tensioning roll.
- the control unit is therefore suitable to compare the value of the tension signal with a pre-established value and, if different, to drive the contact unit, for example rotating it in a clockwise or anti-clockwise direction, so as to keep the tension value of the strip or metal sheet substantially equal to the optimal value.
- a rolling apparatus comprising at least two rolling stands between which at least one tensioning unit according to the present invention is interposed.
- this is used to describe example embodiments of a tensioning unit 10, used in a rolling apparatus 11, to detect the tension value of a metal strip 15 advancing between two rolling stands 46 in a direction of feed F1 according to the direction of the corresponding arrow.
- the metal strip 15 can advance between two rolling stands 46 both in the direction of feed F1 and also in a direction of feed F2, opposite to F1, according to the direction of the corresponding arrow.
- a rolling apparatus 11 can comprise a plurality of rolling stands 46.
- the tensioning unit 10 can be installed between two adjacent rolling stands 46.
- the tensioning unit 10 can be installed between each pair of adjacent rolling stands 46.
- two rolling stands 46 can both comprise a lower work roll 50 and an upper work roll 52 disposed respectively below and above the plane identified by the upper surface of at least one guide plate 44 on which, during working, the metal strip 15 runs and is compressed directly by the rolls 50, 52.
- the lower work roll 50 and the upper work roll 52 can be for example cylindrical in shape with an oblong development in a direction perpendicular to the direction of feed F1 and/or F2.
- the two rolling stands 46 can both also comprise a lower support roll 54 and an upper support roll 56, disposed respectively below the lower work roll 50 and above the upper work roll 52, to limit the flexion of the latter during the rolling of the metal strip 15.
- the lower support roll 54 and the upper support roll 56 can be cylindrical in shape, with an oblong development in a direction perpendicular to the direction of feed F1 and/or F2.
- the disposition of the lower support roll 54 can be provided tangential to the lower work roll 50 and the disposition of the upper support roll 56 can be provided tangential to the upper work roll 52.
- the lower support roll 54 and the upper support roll 56 can have sizes and mass greater than the lower work roll 50 and the upper work roll 52.
- the lower support roll 54 and the upper support roll 56 can be movable nearer to the respective lower work roll 50 and upper work roll 52, in the direction of a vertical axis X perpendicular to the direction of feed F1 and/or F2, and to the lying/feed plane of the metal strip 15, to overcome phenomena of wear deriving from the rolling cycles.
- the tensioning unit 10 can be located for example in an intermediate position between two rolling stands 46.
- the tensioning unit 10 can comprise a contact unit 13, an actuation element 26 and a detection unit 17.
- the contact unit 13, in an inactive position can be disposed below the at least one guide plate 44, which supports the metal strip 15 when it is being worked.
- inactive position we mean the position taken by the tensioning unit 10 when the actuation element 26 is not driven, i.e. it is not extended, and which corresponds essentially to the condition where the contact unit 13 is not resting from below on the metal strip 15.
- the guide plate 44 also defines the lying and feed plane of the metal strip 15 between the two rolling stands 46.
- the at least one guide plate 44 can have an interruption of appropriate size, in correspondence with the contact unit 13, at least equal to its bulk when in use, i.e. when it is rotated, so as to allow it to bring the metal strip 15 under tension, passing through said interruption.
- the contact unit 13 can be rotatable around an axis of rotation Z that lies on a plane substantially parallel to the lying and feed plane of the metal strip 15 and has a direction substantially perpendicular to the direction of feed F1 and/or F2 of the metal strip 15.
- the contact unit 13 can comprise a tensioning roll 12 and a support element 14.
- the tensioning roll 12 can be cylindrical in shape with an oblong development in a direction substantially parallel to the axis of rotation Z.
- the tensioning roll 12 can have an axis of rotation substantially parallel to the axis of rotation Z.
- the support element 14 is provided to support the tensioning roll 12 and can be mounted directly on a support upright 58 of the rolling stand 46.
- the support element 14 can be mounted on a dedicated support structure, different from the support upright 58 of the rolling stand 46.
- the support element 14 can be rotatable, by first pivoting means 16, around the axis of rotation Z, to take the tensioning roll 12 into contact with the metal strip 15.
- the support element 14 can also be connected to an attachment plate 19.
- attachment plate 19 can in turn be connected to the support upright 58 of the rolling stand 46 and clamped by attachment elements 42.
- the attachment plate 19 can be mounted on a dedicated support structure different from the support upright 58 of the rolling stand 46.
- the contact unit 13 can take on a first "inactive" position at a minimum lower point where it rests on a lower mechanical stop 18 (see fig. 1 ), and at least a second position at a maximum upper point of maximum aperture in which it rests on an upper mechanical stop 20, as will be explained in more detail hereafter.
- the contact unit 13 can also comprise a first position transducer 22, mounted centered on the axis of rotation Z, which can detect instant by instant the position of the contact unit 13 and consequently can also detect the position of the tensioning roll 12.
- the first position transducer 22 can be for example an angular or rotatable rotary position transducer, such as an angular or rotary encoder, in particular for example a tachymetric encoder, a relative or incremental encoder, or an absolute encoder.
- an angular or rotary encoder such as an angular or rotary encoder, in particular for example a tachymetric encoder, a relative or incremental encoder, or an absolute encoder.
- the actuation element 26 can include inside it a second position transducer 23 disposed axially to it.
- the positioning of the second position transducer 23 inside the actuation element 26 allows to detect the deviation of the actuation element 26 from the "inactive" position, and consequently to detect the position of the contact unit 13 and hence also the position of the tensioning roll 12.
- the tensioning unit 10 can comprise both a first position transducer 22 and a second position transducer 23, to detect the position of the contact unit 13.
- the contact unit 13 can be connected to the actuation element 26.
- the drive member can be chosen from a group consisting of: an electric motor, a pneumatic motor, a hydraulic piston, a piezoelectric actuator.
- an actuator as used in association with embodiments described here, can be an actuator with an intrinsically linear movement or be configured to convert a circular movement into a linear movement.
- the conversion can be commonly done by means of types of mechanism selected from a group consisting of: screw actuators, such as a jack screw, ball screw actuators and roll screw actuators, or wheel and axle, for example drum, gears, pulley or shaft, actuators such as a lifting cable, a winch, a rack and a pinion group, a chain transmission, a belt transmission, actuators with a rigid chain and a rigid belt.
- the actuation element 26 can be a linear actuator.
- the actuation element 26 can comprise a sleeve 28 and a shaft 29, configured to slide inside the sleeve 28.
- the actuation element 26 can be located below the contact unit 13, in a direction substantially parallel to the direction identified by the vertical axis X.
- the actuation element 26 can be installed inclined at an angle with respect to the direction identified by the vertical axis X.
- the actuation element 26 can be inclined between -35° and +35° with respect to the direction identified by the vertical axis X.
- the actuation element 26 can be provided with a first end 30 and a second end 32, where the first end 30 can correspond to the terminal part of the shaft 29, while the second end 32 can correspond to the terminal part of the sleeve 28.
- the actuation element 26 can be attached by oscillating pins acting on the center line of the actuation element 26.
- connection between the contact unit 13 and the actuation element 26 can be made by pivoting the first end 30 of the shaft 29 to the support element 14.
- the actuation element 26 can instead be connected to the detection unit 17 by the second end 32.
- the detection unit 17 can be located below the actuation element 26 in a direction substantially parallel to the direction identified by the vertical axis X.
- the detection unit 17 can be located below the actuation element 26, so that the two components are not perfectly aligned, i.e. so that an inclination of a certain angle is formed between them, which inclination is kept in consideration by the detection unit 17 when it detects the tension value of the metal strip 15.
- the detection unit 17 can include a connection element 34, a sensor unit 38 and a support bracket 40.
- the detection unit 17 can also include a support plate 37.
- connection between the actuation element 26 and the detection unit 17 can be made by pivoting the second end 32 to the connection element 34.
- connection element 34 is provided rotatable and can be mounted directly on the support upright 58 of the rolling stand 46.
- connection element 34 can be mounted on a dedicated support structure different from the support upright 58 of the rolling stand 46.
- connection element 34 can in turn be rotatable with respect to the support plate 37, to which it is connected by second pivoting means 36.
- the support plate 37 can be connected to the support upright 58 of the rolling stand 46 and clamped by attachment elements 42.
- the support plate 37 can be mounted on a dedicated support structure different from the support upright 58 of the rolling stand 46.
- connection element 34 can be rotatable around an axis of rotation parallel to the axis of rotation Z and hence perpendicular to the direction of feed F1 and/or F2.
- the sensor unit 38 can be positioned, to measure the tension forces acting on the metal strip 15 due to the action of traction at least of the work rolls 50, 52 and the tensioning roll 12.
- the sensor unit 38 can be located below the connection element 34 so that the two elements are not perfectly aligned, i.e. so that an inclination is formed between them of a certain angle, which is kept in consideration by the sensor unit 38 when it detects the tension value of the metal strip 15.
- the sensor unit 38 can be supported by the support bracket 40 and connected stably to it by the attachment elements 42.
- the support bracket 40 can be located below the sensor unit 38 in a direction parallel to the direction identified by the vertical axis X.
- the bracket 40 can be connected to the support plate 37 by the attachment elements 42.
- the support bracket 40 can be directly connected to the support upright 58 of the rolling stand 46 and clamped by the attachment elements 42.
- the support bracket 40 can be mounted on a dedicated support structure different from the support upright 58 of the rolling stand 46.
- the sensor unit 38 can include one or more sensors to detect the force exerted on it by the actuation element 26 as a consequence of the tension caused by the traction of the work rolls 50, 52 and the tensioning roll 12 on the metal strip 15.
- one or more of the sensors included in the sensor unit 38 as used in the embodiments described here can be at least one sensor element selected from the group comprising:
- the sensor unit can also include at least a pressure sensor and at least a force sensor, for example a load cell.
- the force exerted on the sensor unit 38 can be detected by one or more load cells, one or more pressure sensors or one or more other sensors, which use an extensometer, a piezoelectric element, a piezo resistive element, a Hall-effect element or suchlike.
- a pressure is the force exerted per unitary surface, so that depending on whether one or more sensors are provided as pressure sensors or as force sensors or load cells, it could become necessary to consider a conversion.
- a control unit 24 can also be provided, which is configured to receive from the detection unit 17 a signal relating to the tension value of the metal strip 15, acting on the tensioning roll 12, and disposed advancing between two adjacent rolling stands 46.
- control unit 24 is suitable to compare the value of said signal with a pre-established optimal value and to order retroactively a rotation of the contact unit 13, in one direction or another, so as to reduce or increase the pressure exerted by the metal strip 15 in transit on the tensioning roll 12, in order to keep the tension value of the metal strip 15, substantially equal to the optimal value.
- the tensioning unit 10 is provided in a second operating condition in which the contact unit 13 is rotated from the "inactive" position by an angle ⁇ such that it is taken to rest on the upper mechanical stop 20. Therefore, all the intermediate positions between the "inactive" position and the latter are respectively identified by an angle ⁇ comprised between zero and the value relating to the position of maximum aperture.
- the shaft 29 of the actuation element 26 finds itself in this condition when it is at its maximum possible travel with respect to the other positions that the contact unit 13 can assume.
- This force is measured by the sensor unit 38 and, if it is not the same as the predetermined force, the control unit 24 sends a signal to make the contact unit 13 rotate by a certain angle ⁇ or the actuation element 26 by a certain travel.
- the point of contact between the tensioning roll 12 and the metal strip 15 can be provided almost central between two adjacent rolling stands 46 so that the actuation element 26 is subjected to a reaction as perpendicular as possible to the direction of feed F1 and/or F2 and hence as parallel as possible to the vertical axis X.
- the tensioning unit 10 can include at least a contact unit 13 which can in turn comprise at least one tensioning roll 12 and at least one support element 14, by way of example two, at least one actuation element 26, by way of example two, and at least one detection unit 17, by way of example two.
- the tensioning unit 10 comprises for example one tensioning roll 12, two support elements 14, two actuation elements 26 and two detection units 17, then the support elements 14, the actuation elements 26 and the detection units 17 can advantageously be disposed in correspondence with the terminal portions of the oblong development of the tensioning roll 12.
- Using two detection units 17 can entail detecting slightly different tension values of the metal strip 15, which can be processed and mediated by the control unit 24, leading to a further refinement in the retroactive adjustment of the tensioning unit 10.
Description
- The present invention concerns a tensioning unit for rolling apparatuses, used to detect and adjust the tension of strips or metal sheets in the interstand segment between two adjacent rolling stands.
- Tensioning units are known, used in hot rolling apparatuses for metal sheets, which are disposed in an intermediate position between two adjacent rolling stands, to detect and adjust the tension to which the strip or metal sheet being worked is subjected in the interstand segment.
- The tension of the strip or metal sheet is monitored with the purpose of conferring on the product the desired characteristics, and of reaching high standards of quality.
- For example, it is known that characteristics such as the profile and planarity of the strip or sheet depend on correct and constant tension values being maintained throughout the rolling process, in particular in the interstand segments where the strip or sheet are not directly supported.
- Tensioning units are known comprising a tensioning roll mounted on a support and disposed in contact with the strip or sheet in the interstand segment between two adjacent rolling stands.
- The tensioning roll can be driven to interact with the strip or sheet in relation to the tension value detected, acting on a hydraulic motor positioned in axis with the support.
- The tension value of the strip or metal sheet is detected by load cells installed in proximity to the tensioning roll.
- Alternatively, the tension value of the strip or metal sheet can be obtained by reading the position and/or pressure of hydraulic command devices.
- A typical disadvantage of tensioning units for rolling apparatuses of the known type is that they require big spaces for installation, which significantly influences the distance between one rolling stand and the next.
- One disadvantage deriving from the previous one is that a big distance between the rolling stands leads to a reduction in the temperature of the strip or metal sheet during working, which leads to a considerable disadvantage for the hot rolling steps, and can require operations to restore the temperature before the subsequent rolling pass.
- Another consequent disadvantage is that more energy is required to perform the same workings on the strip or metal sheet compared with what would be required by the same steps performed at higher temperatures.
- Another disadvantage is that sliding friction is generated between the mobile parts of the devices that support and move the contact element: such friction entails premature wear and inefficiency and inaccuracy in the action of the tensioning unit.
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JP62156013 - In this solution, the combination of the contact roll/hydraulic cylinder acts directly on the load cell, with possible damage caused thereto and imprecisions in the measurements.
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US 5,718,138 describes a tensioning unit having a contact roll associated with a support arm connected to the shaft of a hydraulic cylinder, so as to define a desired height of the roll with respect to a lying plane of the strip or metal sheet. US'138 provides two methods to detect the tension of the strip, a first that uses a load cell generically associated with the tensioning unit, and a second that uses the value of the pressure of the hydraulic cylinder. - There is therefore a need to perfect a tensioning unit for rolling apparatuses that can overcome at least one of the disadvantages of the state of the art.
- In particular, one purpose of the invention is to obtain a tensioning unit which, installed in the interstand segment, allows to reduce the distance between two adjacent rolling stands compared with known tensioning units, so as to reduce to a minimum the lowering in temperature of the strip or metal sheet being worked.
- Therefore, one purpose of the present invention is to obtain a tensioning unit that is compact and not bulky.
- Another purpose of the present invention is to obtain a tensioning unit that is precise and reliable, and in which the friction deriving from the sliding of moving parts is reduced.
- Another purpose of the present invention is to improve the accessibility of the measuring element of the tensioning unit in order to carry out the maintenance steps.
- Another purpose of the present invention concerns the possibility of replacing the tensioning roll of the tensioning unit when it is worn or ruined, without having to operate in proximity to the measuring element.
- Another purpose of the present invention is to position the measuring element far from the zone where the strip or metal sheet runs, because, since it is a sensitive element, it should preferably be placed somewhere sheltered from vibrations and dirt.
- Furthermore, one purpose of the present invention is to provide a tensioning unit that is simple and economical.
- The Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
- The present invention is set forth and characterized in the independent claim, while the dependent claims describe other characteristics of the invention or variants to the main inventive idea.
- In accordance with the above purposes, a tensioning unit is provided for a rolling apparatus which includes at least one rolling stand.
- According to the present invention, the tensioning unit comprises a contact unit which is provided with at least one tensioning roll configured to be taken to rest on and put under tension a strip or metal sheet, at least one actuation element to drive the contact unit, taking it into contact with the strip or metal sheet, and at least one detection unit to measure the forces to which the contact unit is subjected, and hence the tension of the strip or metal sheet.
- According to the present invention, the contact unit, the actuation element and the detection unit are disposed one below the other, so as to define a main development of the column type of the tensioning unit, in this way obtaining a compact tensioning unit with a very limited lateral extension, such as to allow to position two adjacent rolling stands of a rolling apparatus close to each other.
- According to another characteristic, the contact unit is disposed on a support element rotatable around an axis lying on a plane substantially parallel to the lying and/or feed plane of the strip or metal sheet.
- According to one formulation of the present invention, the actuation element can be a linear actuator disposed vertical according to its greatest size, hence disposed during use substantially orthogonal to the lying and feed plane of the strip or metal sheet.
- According to a variant, the actuation element defines during use an angle other than zero with respect to the vertical of the strip or metal sheet.
- According to one formulation of the present invention, the tensioning unit includes at least one control unit configured to receive from the detection unit a signal relating to the value of tension of the metal strip or metal sheet advancing in one direction and/or another, between two adjacent rolling stands and acting on the tensioning roll.
- The control unit is therefore suitable to compare the value of the tension signal with a pre-established value and, if different, to drive the contact unit, for example rotating it in a clockwise or anti-clockwise direction, so as to keep the tension value of the strip or metal sheet substantially equal to the optimal value.
- A rolling apparatus is also provided, comprising at least two rolling stands between which at least one tensioning unit according to the present invention is interposed.
- These and other characteristics of the present invention will become apparent from the following description of some embodiments, given as a non-restrictive example with reference to the attached drawings wherein:
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fig. 1 is a lateral view of a tensioning unit for rolling apparatuses in a first operating condition, according to embodiments described here; -
fig. 2 is a lateral view of a tensioning unit for rolling apparatuses in a second operating condition, according to other embodiments described here; -
fig. 3 shows a cross section from III to III of the tensioning unit for rolling apparatuses infig. 1 . - To facilitate comprehension, the same reference numbers have been used, where possible, to identify identical common elements in the drawings. It is understood that elements and characteristics of one embodiment can conveniently be incorporated into other embodiments without further clarifications.
- We shall now refer in detail to the various embodiments of the present invention, of which one or more examples are shown in the attached drawing. Each example is supplied by way of illustration of the invention and shall not be understood as a limitation thereof. For example, the characteristics shown or described insomuch as they are part of one embodiment can be adopted on, or in association with, other embodiments to produce another embodiment. It is understood that the present invention shall include all such modifications and variants.
- Before describing these embodiments, we must also clarify that the present description is not limited in its application to details of the construction and disposition of the components as described in the following description using the attached drawings. The present description can provide other embodiments and can be obtained or executed in various other ways. We must also clarify that the phraseology and terminology used here is for the purposes of description only, and cannot be considered as limitative.
- With reference to
fig. 1 , this is used to describe example embodiments of atensioning unit 10, used in arolling apparatus 11, to detect the tension value of ametal strip 15 advancing between tworolling stands 46 in a direction of feed F1 according to the direction of the corresponding arrow. - According to some variants, in the case of reversing stands, the
metal strip 15 can advance between tworolling stands 46 both in the direction of feed F1 and also in a direction of feed F2, opposite to F1, according to the direction of the corresponding arrow. - According to some variants, a
rolling apparatus 11 can comprise a plurality ofrolling stands 46. - According to possible variants, the
tensioning unit 10 can be installed between two adjacentrolling stands 46. - According to other variants, the
tensioning unit 10 can be installed between each pair of adjacentrolling stands 46. - According to some variants, described using
fig. 1 , tworolling stands 46 can both comprise alower work roll 50 and anupper work roll 52 disposed respectively below and above the plane identified by the upper surface of at least oneguide plate 44 on which, during working, themetal strip 15 runs and is compressed directly by therolls - The
lower work roll 50 and theupper work roll 52 can be for example cylindrical in shape with an oblong development in a direction perpendicular to the direction of feed F1 and/or F2. - According to some other variants, the two
rolling stands 46 can both also comprise alower support roll 54 and anupper support roll 56, disposed respectively below thelower work roll 50 and above theupper work roll 52, to limit the flexion of the latter during the rolling of themetal strip 15. - The
lower support roll 54 and theupper support roll 56 can be cylindrical in shape, with an oblong development in a direction perpendicular to the direction of feed F1 and/or F2. - The disposition of the
lower support roll 54 can be provided tangential to thelower work roll 50 and the disposition of theupper support roll 56 can be provided tangential to theupper work roll 52. - Furthermore, the
lower support roll 54 and theupper support roll 56 can have sizes and mass greater than thelower work roll 50 and theupper work roll 52. - The
lower support roll 54 and theupper support roll 56 can be movable nearer to the respectivelower work roll 50 andupper work roll 52, in the direction of a vertical axis X perpendicular to the direction of feed F1 and/or F2, and to the lying/feed plane of themetal strip 15, to overcome phenomena of wear deriving from the rolling cycles. - According to some variants, described using
fig. 1 , thetensioning unit 10 can be located for example in an intermediate position between two rolling stands 46. - The
tensioning unit 10 can comprise acontact unit 13, anactuation element 26 and adetection unit 17. - According to some variants, the
contact unit 13, in an inactive position, can be disposed below the at least oneguide plate 44, which supports themetal strip 15 when it is being worked. - We must clarify here that by "inactive position" we mean the position taken by the
tensioning unit 10 when theactuation element 26 is not driven, i.e. it is not extended, and which corresponds essentially to the condition where thecontact unit 13 is not resting from below on themetal strip 15. - The
guide plate 44 also defines the lying and feed plane of themetal strip 15 between the two rolling stands 46. - The at least one
guide plate 44 can have an interruption of appropriate size, in correspondence with thecontact unit 13, at least equal to its bulk when in use, i.e. when it is rotated, so as to allow it to bring themetal strip 15 under tension, passing through said interruption. - The
contact unit 13 can be rotatable around an axis of rotation Z that lies on a plane substantially parallel to the lying and feed plane of themetal strip 15 and has a direction substantially perpendicular to the direction of feed F1 and/or F2 of themetal strip 15. - According to some variants, the
contact unit 13 can comprise atensioning roll 12 and asupport element 14. - The
tensioning roll 12 can be cylindrical in shape with an oblong development in a direction substantially parallel to the axis of rotation Z. - Furthermore, the
tensioning roll 12 can have an axis of rotation substantially parallel to the axis of rotation Z. - According to some variants, the
support element 14 is provided to support thetensioning roll 12 and can be mounted directly on asupport upright 58 of the rollingstand 46. - According to some other variants, the
support element 14 can be mounted on a dedicated support structure, different from thesupport upright 58 of the rollingstand 46. - According to possible embodiments, the
support element 14 can be rotatable, by first pivoting means 16, around the axis of rotation Z, to take thetensioning roll 12 into contact with themetal strip 15. - According to some other variants, the
support element 14 can also be connected to anattachment plate 19. - Moreover, the
attachment plate 19 can in turn be connected to thesupport upright 58 of the rollingstand 46 and clamped byattachment elements 42. - According to some possible embodiments, the
attachment plate 19 can be mounted on a dedicated support structure different from thesupport upright 58 of the rollingstand 46. - The
contact unit 13 can take on a first "inactive" position at a minimum lower point where it rests on a lower mechanical stop 18 (seefig. 1 ), and at least a second position at a maximum upper point of maximum aperture in which it rests on an uppermechanical stop 20, as will be explained in more detail hereafter. - According to some variants, the
contact unit 13 can also comprise afirst position transducer 22, mounted centered on the axis of rotation Z, which can detect instant by instant the position of thecontact unit 13 and consequently can also detect the position of thetensioning roll 12. - The
first position transducer 22 can be for example an angular or rotatable rotary position transducer, such as an angular or rotary encoder, in particular for example a tachymetric encoder, a relative or incremental encoder, or an absolute encoder. - According to some variants, the
actuation element 26 can include inside it asecond position transducer 23 disposed axially to it. - The positioning of the
second position transducer 23 inside theactuation element 26 allows to detect the deviation of theactuation element 26 from the "inactive" position, and consequently to detect the position of thecontact unit 13 and hence also the position of thetensioning roll 12. - According to some possible embodiments, the
tensioning unit 10 can comprise both afirst position transducer 22 and asecond position transducer 23, to detect the position of thecontact unit 13. - According to some variants, the
contact unit 13 can be connected to theactuation element 26. - An
actuation element 26 as used in the embodiments described here, both in the case of a single actuation element and also in the case of several dedicated actuation elements, could include a corresponding drive member. - The drive member can be chosen from a group consisting of: an electric motor, a pneumatic motor, a hydraulic piston, a piezoelectric actuator. Usually, an actuator, as used in association with embodiments described here, can be an actuator with an intrinsically linear movement or be configured to convert a circular movement into a linear movement. The conversion can be commonly done by means of types of mechanism selected from a group consisting of: screw actuators, such as a jack screw, ball screw actuators and roll screw actuators, or wheel and axle, for example drum, gears, pulley or shaft, actuators such as a lifting cable, a winch, a rack and a pinion group, a chain transmission, a belt transmission, actuators with a rigid chain and a rigid belt.
- Advantageously, the
actuation element 26 can be a linear actuator. - The
actuation element 26 can comprise asleeve 28 and ashaft 29, configured to slide inside thesleeve 28. - Furthermore, the
actuation element 26 can be located below thecontact unit 13, in a direction substantially parallel to the direction identified by the vertical axis X. - According to some possible variants, the
actuation element 26 can be installed inclined at an angle with respect to the direction identified by the vertical axis X. - Merely by way of non-restrictive example, the
actuation element 26 can be inclined between -35° and +35° with respect to the direction identified by the vertical axis X. - According to some variants, the
actuation element 26 can be provided with afirst end 30 and asecond end 32, where thefirst end 30 can correspond to the terminal part of theshaft 29, while thesecond end 32 can correspond to the terminal part of thesleeve 28. - According to some variants, the
actuation element 26 can be attached by oscillating pins acting on the center line of theactuation element 26. - The connection between the
contact unit 13 and theactuation element 26 can be made by pivoting thefirst end 30 of theshaft 29 to thesupport element 14. - According to some variants, the
actuation element 26 can instead be connected to thedetection unit 17 by thesecond end 32. - Furthermore, the
detection unit 17 can be located below theactuation element 26 in a direction substantially parallel to the direction identified by the vertical axis X. - According to some possible variants, the
detection unit 17 can be located below theactuation element 26, so that the two components are not perfectly aligned, i.e. so that an inclination of a certain angle is formed between them, which inclination is kept in consideration by thedetection unit 17 when it detects the tension value of themetal strip 15. - According to some possible embodiments, the
detection unit 17 can include aconnection element 34, asensor unit 38 and asupport bracket 40. - According to other possible embodiments, the
detection unit 17 can also include asupport plate 37. - The connection between the
actuation element 26 and thedetection unit 17 can be made by pivoting thesecond end 32 to theconnection element 34. - According to some variants, the
connection element 34 is provided rotatable and can be mounted directly on thesupport upright 58 of the rollingstand 46. - According to some possible embodiments, the
connection element 34 can be mounted on a dedicated support structure different from thesupport upright 58 of the rollingstand 46. - According to some other variants, the
connection element 34 can in turn be rotatable with respect to thesupport plate 37, to which it is connected by second pivoting means 36. - Furthermore, the
support plate 37 can be connected to thesupport upright 58 of the rollingstand 46 and clamped byattachment elements 42. - According to some possible embodiments, the
support plate 37 can be mounted on a dedicated support structure different from thesupport upright 58 of the rollingstand 46. - The
connection element 34 can be rotatable around an axis of rotation parallel to the axis of rotation Z and hence perpendicular to the direction of feed F1 and/or F2. - According to some variants, below the
connection element 34, in a direction parallel to the direction identified by the vertical axis X, thesensor unit 38 can be positioned, to measure the tension forces acting on themetal strip 15 due to the action of traction at least of the work rolls 50, 52 and thetensioning roll 12. - According to some possible variants, the
sensor unit 38 can be located below theconnection element 34 so that the two elements are not perfectly aligned, i.e. so that an inclination is formed between them of a certain angle, which is kept in consideration by thesensor unit 38 when it detects the tension value of themetal strip 15. - The
sensor unit 38 can be supported by thesupport bracket 40 and connected stably to it by theattachment elements 42. - The
support bracket 40 can be located below thesensor unit 38 in a direction parallel to the direction identified by the vertical axis X. - According to some variants, the
bracket 40 can be connected to thesupport plate 37 by theattachment elements 42. - Alternatively, the
support bracket 40 can be directly connected to thesupport upright 58 of the rollingstand 46 and clamped by theattachment elements 42. - According to some possible embodiments, the
support bracket 40 can be mounted on a dedicated support structure different from thesupport upright 58 of the rollingstand 46. - In some embodiments supplied as a non-restrictive example, the
sensor unit 38 can include one or more sensors to detect the force exerted on it by theactuation element 26 as a consequence of the tension caused by the traction of the work rolls 50, 52 and thetensioning roll 12 on themetal strip 15. - It should be noted here that one or more of the sensors included in the
sensor unit 38 as used in the embodiments described here can be at least one sensor element selected from the group comprising: - a force sensor or transducer, like a load cell, for example a load cell with extensometer, a hydraulic or hydrostatic load cell, a piezoelectric load cell, a vibrating wire load cell or a capacitive load cell;
- a pressure sensor or transducer, for example the electronic type generally used to collect a force to measure deformation or deviance caused by the force applied on an area, like a sensor with a piezo resistive extensometer, a capacitive sensor, an electromagnetic sensor, a piezoelectric sensor, an optical sensor or a potentiometric sensor.
- It should be understood that, depending on the specific disposition of the
sensor unit 38, the sensor unit can also include at least a pressure sensor and at least a force sensor, for example a load cell. - According to different implementations of the embodiments described here, the force exerted on the
sensor unit 38 can be detected by one or more load cells, one or more pressure sensors or one or more other sensors, which use an extensometer, a piezoelectric element, a piezo resistive element, a Hall-effect element or suchlike. With this, it must be considered that a pressure is the force exerted per unitary surface, so that depending on whether one or more sensors are provided as pressure sensors or as force sensors or load cells, it could become necessary to consider a conversion. - According to some possible embodiments, a
control unit 24 can also be provided, which is configured to receive from the detection unit 17 a signal relating to the tension value of themetal strip 15, acting on thetensioning roll 12, and disposed advancing between two adjacent rolling stands 46. - Furthermore, the
control unit 24 is suitable to compare the value of said signal with a pre-established optimal value and to order retroactively a rotation of thecontact unit 13, in one direction or another, so as to reduce or increase the pressure exerted by themetal strip 15 in transit on thetensioning roll 12, in order to keep the tension value of themetal strip 15, substantially equal to the optimal value. - According to some other variants, described with reference to
fig. 2 , thetensioning unit 10 is provided in a second operating condition in which thecontact unit 13 is rotated from the "inactive" position by an angle α such that it is taken to rest on the uppermechanical stop 20. Therefore, all the intermediate positions between the "inactive" position and the latter are respectively identified by an angle α comprised between zero and the value relating to the position of maximum aperture. - According to some variants, again described with reference to
fig. 2 , theshaft 29 of theactuation element 26 finds itself in this condition when it is at its maximum possible travel with respect to the other positions that thecontact unit 13 can assume. - Depending on the force with which the
actuation element 26 is driven, a force is therefore generated with the same direction and the same intensity but an opposite sense due to the reaction of themetal strip 15 taken under tension. - This force is measured by the
sensor unit 38 and, if it is not the same as the predetermined force, thecontrol unit 24 sends a signal to make thecontact unit 13 rotate by a certain angle α or theactuation element 26 by a certain travel. - Advantageously, the point of contact between the
tensioning roll 12 and themetal strip 15 can be provided almost central between two adjacent rolling stands 46 so that theactuation element 26 is subjected to a reaction as perpendicular as possible to the direction of feed F1 and/or F2 and hence as parallel as possible to the vertical axis X. This makes the measuring by thesensor unit 38 repeatable, under constant conditions of incidence. - According to some variants, described with reference to
fig. 3 , thetensioning unit 10 can include at least acontact unit 13 which can in turn comprise at least onetensioning roll 12 and at least onesupport element 14, by way of example two, at least oneactuation element 26, by way of example two, and at least onedetection unit 17, by way of example two. - According to some other variants, if the
tensioning unit 10 comprises for example onetensioning roll 12, twosupport elements 14, twoactuation elements 26 and twodetection units 17, then thesupport elements 14, theactuation elements 26 and thedetection units 17 can advantageously be disposed in correspondence with the terminal portions of the oblong development of thetensioning roll 12. - Using two
detection units 17 can entail detecting slightly different tension values of themetal strip 15, which can be processed and mediated by thecontrol unit 24, leading to a further refinement in the retroactive adjustment of thetensioning unit 10. - It is clear that modifications and/or additions of parts may be made to the
tensioning unit 10 as described heretofore, without departing from the field and scope of the present invention. - It is also clear that, although the present invention has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of tensioning
unit 10, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
Claims (18)
- Tensioning unit to detect and adjust a tension value of a metal strip (15) in a rolling apparatus (11), which includes at least one rolling stand (46), comprising:- at least one contact unit (13) provided with at least one tensioning roll (12);- at least one actuation element (26) to drive said at least one contact unit (13), the actuation element (26) comprising a sleeve (28) and a shaft (29) configured to slide inside the sleeve (28),- at least one detection unit (17) to measure the forces to which the at least one contact unit (13) is subjected,at least one contact unit (13), said at least one actuation element (26) and said at least one detection unit (17) being disposed at least partly aligned with each other, one after the other, so as to define a main development of the column type of the tensioning unit (10), the detection unit (17) being disposed below the actuation element (26) in order to detect a tension value of the metal strip (15), and said contact unit (13) comprising at least a support element (14) on which said tensioning roll (12) is mounted, said support element (14) being rotatable around an axis of rotation (Z), said actuation element (26) comprising a first end (30) and a second end (32), the first end (30) being the terminal part of the shaft (29) and the second end (32) being the terminal part of the sleeve (28), the actuation element (26) being pivoted with its first end (30) to said support element (14) in an intermediate position between said axis of rotation (Z) and said tensioning roll (12), and its second end (32) being pivoted to a connection element (34) of said detection unit (17).
- Tensioning unit as in claim 1, characterized in that said connection element (34) being rotatable with respect to pivoting means (36).
- Tensioning unit as in claim 1 or 2, characterized in that said actuation element (26) is a linear actuator.
- Tensioning unit as in any of the claims 1-3, characterized in that said support element (14) is configured to be associated to a support upright (58) of said rolling stand (46).
- Tensioning unit as in any of the claims 1-3, characterized in that said support element (14) is configured to be associated to a dedicated support structure which is different from the support upright (58) of the rolling stand (46).
- Tensioning unit as in any claim hereinbefore, characterized in that said contact unit (13) is rotatable between a first position in which it rests on a lower mechanical stop (18) and at least one second position of maximum aperture in which it rests on an upper mechanical stop (20).
- Tensioning unit as in any claim hereinbefore, characterized in that it is provided passing through an interruption of at least one guide plate (44) that prolongs the extension of said at least one rolling stand (46).
- Tensioning unit as in any claim hereinbefore, characterized in that at least one first position transducer (22) and/or at least one second position transducer (23) is associated to said contact unit (13).
- Tensioning unit as in claim 8, characterized in that said first position transducer (22) and/or said second position transducer (23) is an encoder.
- Tensioning unit as in claim 8 or 9, characterized in that said second position transducer (23) is mounted in axis and internally to the actuation element (26).
- Tensioning unit as in any claim hereinbefore, characterized in that said detection unit (17) comprises at least one connection element (34), at least one sensor unit (38) and at least one support bracket (40).
- Tensioning unit as in claim 11, characterized in that said at least one sensor unit (38) comprises at least one load cell disposed below and substantially in contact with said actuation element (26).
- Tensioning unit as in any claim hereinbefore, characterized in that it comprises at least one control unit (24) configured to receive from said detection unit (17) a signal relating to the value of tension of a metal strip (15) advancing in a direction of feed (F1) or in a direction of feed (F2), to compare said value with a pre-established value and, if different, to order a rotation of said contact unit (13), in a clockwise or anti-clockwise direction, so as to reduce or increase the tension value of the metal strip (15), returning it to an optimal value.
- Tensioning unit as in any claim hereinbefore, characterized in that it is installed between two rolling stands (46) that both comprise at least one lower work roll (50) and at least one upper work roll (52).
- Tensioning unit as in claim 14, characterized in that said rolling stands (46) also comprises at least one lower support roll (54) and at least one upper support roll (56).
- Rolling apparatus comprising at least one rolling stand (46) and a metal strip or sheet (15), characterized in that it comprises at least one tensioning unit (10) as in any claim from 1 to 15 and directly mounted on a support upright (58) of said rolling stand (46) or on a dedicated support structure.
- Rolling apparatus as in claim 16, comprising a guide plate (44) defining a lying and feed plane of said metal strip (15) in a direction of feed (F1, F2), characterized in that said axis of rotation (Z) with respect to which said support element (14) rotates lies on a plane substantially parallel to said lying plane of said metal strip (15) and has a direction substantially orthogonal to said direction (F1, F2).
- Rolling apparatus as in claim 16 or 17, characterized in that it comprises rolling stands (46) of the reversing type.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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ITUB20150684 | 2015-05-18 |
Publications (2)
Publication Number | Publication Date |
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EP3095532A1 EP3095532A1 (en) | 2016-11-23 |
EP3095532B1 true EP3095532B1 (en) | 2019-04-03 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP16169926.9A Active EP3095532B1 (en) | 2015-05-18 | 2016-05-17 | Tensioning unit for rolling apparatuses |
Country Status (3)
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EP (1) | EP3095532B1 (en) |
CN (1) | CN106166565B (en) |
MX (1) | MX2016006380A (en) |
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CN114571523B (en) * | 2022-04-08 | 2023-12-19 | 河北钛通滤清器有限公司 | Filter paper cutting machine capable of adaptively adjusting tension of paper tape |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE794186A (en) * | 1972-01-21 | 1973-07-18 | Wean United Inc | METHOD AND APPARATUS FOR TENSIONING A BAND |
DE3419697A1 (en) * | 1984-05-25 | 1985-11-28 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | Hot-strip rolling mill tension mechanism |
JPS62156013A (en) | 1985-12-27 | 1987-07-11 | Sumitomo Metal Ind Ltd | Looper control method for continuous rolling mill |
JPH08150408A (en) | 1994-11-25 | 1996-06-11 | Toshiba Corp | Looper controller |
US5878933A (en) * | 1995-10-18 | 1999-03-09 | Laughery; Harry E. | Strip guiding apparatus and associated method for maintaining lateral position |
DE102007045698A1 (en) * | 2006-09-25 | 2008-04-03 | Sms Demag Ag | Method for winding metal strip on to spindle to form reel uses swiveling tension sensor to measure tension of strip during winding which is pivoted on reel frame |
BRPI0716770B1 (en) * | 2006-09-25 | 2019-03-26 | Sms Demag Ag | PROCESS AND DEVICE FOR CONNECTING METAL STRIPS ON A COILING ENGINE |
JP5783925B2 (en) * | 2012-02-08 | 2015-09-24 | 株式会社日立製作所 | Control device for hot tandem rolling mill and control method for hot tandem rolling mill |
-
2016
- 2016-05-16 MX MX2016006380A patent/MX2016006380A/en active IP Right Grant
- 2016-05-17 CN CN201610325768.5A patent/CN106166565B/en active Active
- 2016-05-17 EP EP16169926.9A patent/EP3095532B1/en active Active
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CN106166565A (en) | 2016-11-30 |
EP3095532A1 (en) | 2016-11-23 |
CN106166565B (en) | 2018-10-09 |
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