EP4341013A1 - Kassette für zumindest eine arbeitswalze in einem walzgerüst - Google Patents
Kassette für zumindest eine arbeitswalze in einem walzgerüstInfo
- Publication number
- EP4341013A1 EP4341013A1 EP22718101.3A EP22718101A EP4341013A1 EP 4341013 A1 EP4341013 A1 EP 4341013A1 EP 22718101 A EP22718101 A EP 22718101A EP 4341013 A1 EP4341013 A1 EP 4341013A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cassette
- roll
- adjusting
- work roll
- work
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B29/00—Counter-pressure devices acting on rolls to inhibit deflection of same under load, e.g. backing rolls ; Roll bending devices, e.g. hydraulic actuators acting on roll shaft ends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
- B21B13/145—Lateral support devices for rolls acting mainly in a direction parallel to the movement of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
- B21B2203/06—Cassettes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
Definitions
- the invention relates to a cassette for at least one work roll in a roll stand for rolling rolled stock.
- the invention relates to a roll stand with at least one cassette of this type and a method for adjusting the adjustment cylinders in such a cassette.
- the background to the present invention is the physical fact that in conventional roll stands with four or six rolls without horizontal support for the work rolls, the permissible work roll diameter has a lower limit. This restriction is given because only work rolls with a sufficiently large roll diameter do not tend to bend laterally or horizontally, even when loaded with high contact forces.
- This patent application not only discloses the use of hydrostatic support shells for the work roll, but also a combination of the small work roll and a first intermediate roll in the form of a cassette for insertion between the roll stands of a roll stand instead of the classic chocks with the normal work rolls otherwise used.
- the supporting shell known from said German patent application is relatively thin and slender; Therefore, even if it is pressed horizontally against the work rolls with an operator-side and a drive-side adjusting cylinder, it is often not suitable for successfully counteracting or even counteracting a horizontal deflection of the work roll or a self-reinforcing deflection of the work roll as a reaction to a large rolling force to prevent such a deflection.
- the invention is based on the object of further developing a known cassette for at least one work roll in a roll stand, a known roll stand with the cassette and a known method for adjusting the adjustment cylinders in the cassette such that a horizontal deflection of the slim work roll is effective even with high rolling forces is prevented.
- the flexural rigidity of the supporting bridge is greater than the flexural rigidity of the locking mechanism in connection with the left side of the cassette base body that accommodates the locking mechanism
- the invention proposes designing the supporting shell or the supporting bridge carrying it so stiff that it does not yield to large horizontal forces exerted on it by the work roll or does not bend itself or bends only very slightly, even if the support shell or the support bridge is supported on one longitudinal side of the cassette with two adjustment mechanisms which are at a greater distance from one another. Due to the high stressed flexural rigidity of the supporting bridge as a support for the supporting shell, deflection of the supporting shell is prevented even under the influence of large horizontal forces from the work roll, even if the two adjustment mechanisms that carry the supporting bridge with the supporting shell are eccentrically far apart from each other.
- Page 2 The decisive feature to be able to build the entire support mechanism into a cassette is the transfer of rigidity to the support bridge.
- the flexibility of the employment is consciously accepted and sufficiently compensated by a suitable control strategy, see below.
- the adjusting mechanism has at least one adjusting cylinder for adjusting the supporting bridge with the supporting shell against the work roll.
- At least one toggle lever is provided for articulating the supporting bridge with the supporting shell on one of the longitudinal sides of the cassette base body. This takes place via a first lever arm of the toggle lever, which is articulated with its end remote from the knee joint to the longitudinal side of the cassette base body.
- the second lever arm of the toggle lever is formed by the support bridge itself. Both lever arms are articulated to each other via a knee joint.
- the adjusting cylinder is articulated either on one of the two lever arms or on the toggle joint of the toggle lever and is supported with its other end on the longitudinal side of the cassette base body.
- the adjusting cylinder is preferably articulated vertically, or at least with a vertical component in the longitudinal side of the cassette base body.
- the adjusting mechanism is formed by the knee joint, the first lever arm and the adjusting cylinder.
- the second lever arm of the knee joint in the form of the support bridge is no longer part of the adjustment mechanism, because it serves to articulate the support bridge to the longitudinal side of the cassette body and to position it against the surface of the work roll.
- the formation of the adjusting mechanism 140 'in the form of the toggle lever in connection with the at least substantially vertically employed adjusting cylinder offers the advantage that the cassette in their
- page 3 lateral dimensions can be kept slim, in particular so slim that it can be pushed into the stand window of the roll stand instead of the chocks of classic work rolls.
- position sensors and/or force sensors are assigned to or integrated in the adjusting cylinders.
- the position sensors are used for direct or indirect detection of the respective contact position of the bearing shell against the work roll.
- the force sensors are used to record the contact forces with which the supporting shell is typically pressed against the work roll via a film of cooling lubricant.
- a supporting bridge with a supporting shell is articulated on each of the two opposite longitudinal sides of the cassette body so that the supporting shells act on opposite areas of the surface of the work roll.
- the two supporting bridges are articulated on the opposite longitudinal sides of the cassette base body via preferably two of the said adjustment mechanisms.
- an intermediate or back-up roll is also rotatably mounted above or below the work roll on the opposite short sides of the recess in the cassette base body. The intermediate or back-up roll in the cassette is used to vertically support the work roll.
- the support bridge and the support shell can be formed in one piece.
- the cassette can be designed as an interchangeable cassette for a roll stand to be pushed into or pulled out of the receptacle for the chocks of the conventional work rolls with a larger diameter in the roll stands of the roll stand.
- the above-mentioned object of the invention is achieved by the subject matter of claim 11. Accordingly, the inventive
- the cassette according to the invention can either be permanently installed in the roll stand between the two roll stands or it is designed as an interchangeable cassette for insertion into or removal from the receptacles for the chocks of the work rolls in the roll stand stands.
- An upper cassette can be provided in the roll stand for receiving the upper work roll and preferably also an upper intermediate roll and/or a lower cassette can be provided for receiving the lower work roll and preferably also a lower intermediate roll of the roll stand. Otherwise the advantages of the solution for the roll stand correspond to the advantages mentioned above with reference to the cassette.
- the method according to the invention relates to the adjustment of the adjusting cylinders in at least one cassette according to one of claims 1 to 10 installed in a roll stand 50 according to one of the preceding claims 11 to 14.
- the method according to the invention provides as an essential method step that for initialization before the start of rolling operation all Adjusting cylinders in the cassette can be set to a starting target position that is individually specified for each of the adjusting cylinders both on the bending side and on the opposite side by suitably varying the pressure in the adjusting cylinders. In this case, this starting target position corresponds to a
- each of the cylinders is set to its respective individual operating point. Based on this working point setting, the target positions of all the adjusting cylinders on the bending side are then changed, in particular increased, until the adjusting forces individually applied by the adjusting cylinders on the bending side each reach a predetermined target
- Preload force should have reached Fv.
- This target prestressing force is preferably specified uniformly for all adjusting cylinders on the bending side. The target positions for the adjusting cylinders on the opposite side of the bending side within the cassette remain unaffected.
- all adjusting cylinders within the cassette are thus set to their respective intended position before the start of the rolling process.
- the differential force of contact forces from contact cylinders arranged in pairs opposite one another within the cassette on the bending side and the opposite side is determined and regulated to a specified expected value for the differential force by suitable variation of the target position for at least one of the opposing contact cylinders involved. In this way, the stability of the rolling process is continuously monitored and maintained.
- FIG. 1 shows a roll stand with the cassette according to the invention two variants, each in a cross-section;
- FIG. 2 shows the cassette according to the invention in a perspective view
- FIG. 3 shows the cassette according to the invention in a longitudinal section
- FIG. 4 shows the cassette according to the invention in a cross section
- FIG. 5 shows the adjustment mechanism according to the invention with the support bridge according to the invention as a support for the support shell on both sides of the work roll, once in the unloaded state and once in the state with a horizontal load;
- FIG. 6 shows a position control circuit according to the invention.
- FIG. 7 shows a target value calculation device with a process model for the technical forming mapping of the rolling process for calculating various position and force target values.
- FIG. 1 shows the schematic representation of a roll stand in the form of the plurality of rolls arranged one above the other in the vertical direction.
- the work rolls 10 each span a roll gap for rolling rolling stock (not shown in FIG. 1), in particular metal strip.
- the upper work roll 10 is supported in the horizontal direction by support shells 120.
- the support shells 120 are mounted on rigid supports, so-called support bridges 130, and are pressed against the surface of the upper work roll 10
- the upper work roll 10 is supported by an upper intermediate roll 20 in the vertical direction.
- the upper intermediate roll 20, the upper work roll 10, the support shells 120 with the support bridges 130 and the adjusting cylinders 142 are mounted in a compact design in an upper cassette 100-o.
- the support shells 120 do not press directly on the surface of the upper work roll 10, in particular with their longitudinal sides, but only indirectly via a film of cooling lubricant, for example hydraulic oil. This meaning is also meant when it is casually mentioned in the application that one of the supporting shells presses or is pressed against the work roll.
- the cooling lubricant is fed into the lubricating gap between the work roll and the supporting shell through the oil lines 170 shown in FIG. 1, which are also connected to an oil pump P.
- screens e.g. in the form of metal sheets, can be mounted on the two end faces of the respective supporting shell.
- the screens are preferably formed complementary to the surface of the work roll at their edge sections facing the work roll.
- the diaphragms can then lie directly on the surface of the work roll outside of the rolling stock to be rolled, in particular during the rolling operation, with their preferably complementary shaped edge sections, preferably via sealing lips, in order to effectively prevent cooling lubricant from escaping.
- FIG. 2 shows the cassette 100 known from FIG of the cassette 100 spoken.
- the cassette 100 consists essentially of a cassette base body 110 in which an elongated recess 112 is formed.
- the elongated recess 112 is spanned by two opposite short sides and two opposite long sides.
- the intermediate roller 20 that can be seen in FIG. 2 is rotatably mounted on the opposite short sides.
- the cassette 100 is shaped in such a way that it can be pushed into the receptacles for work roll chocks in the window of a roll stand.
- FIG. 3 shows the cassette 100 known from FIG. 2 in a longitudinal section. It can be seen that not only the intermediate roll 20, but also the work roll 10, which is supported by the back-up roll 20 in the vertical direction, is rotatably mounted on the short sides of the recess 112.
- FIG. 4 shows said cassette 100 in a cross section, similar to that in FIG. 1, but here in somewhat more detail. It can be seen that the centers or axes of rotation of the work roll 10 and the back-up roll 20 are exactly one above the other. In this constellation there is an unstable or only quasi-unstable equilibrium and the work roll 10 therefore tends slightly to horizontal bending, in particular if the vertical rolling forces occurring are particularly large and its slenderness is large in comparison to that of the intermediate roll 20 . In order to prevent such a deflection of the work roll 10, this is laterally with the help of the support shells 120 in a horizontal
- the support shells 120 are in turn each connected to a carrier 130 which, via a positioning mechanism, together with the connected support shell 120, is positioned in the horizontal direction against the surface of the work roll.
- the ends of the second lever arm 145, 130 near the knee joint are both articulated to one another via the knee joint 144.
- the end of the first lever arm 145 remote from the knee joint is articulated to the longitudinal side of the cassette base body 110 .
- the adjusting cylinder 142 is built into the longitudinal side of the cassette base body or is articulated to the longitudinal side, but is at least supported on one side thereof.
- the other end of the adjusting cylinder 142 is in operative connection with the toggle lever 143, ultimately for adjusting the supporting shell 120 against the surface of the work roll 10.
- the essentially vertical movement of the adjusting cylinder 142 is converted into a horizontal movement or Contact force deflected for the bearing shell.
- the adjusting cylinder 142 can in principle act in an articulated manner both on one of the two lever arms 145 , 130 and on the toggle joint 144 . In the present case, however, the articulation of the adjusting cylinder 142 directly on the knee joint 144, as shown in FIG. 4, appears to be particularly advantageous.
- the position sensor 150 si with 1 ⁇ i ⁇ I with I €N is used for direct detection of the position of the adjusting cylinder 142 and thus for indirect detection of the adjusting position of the support shell against the work roll.
- the force sensor 160 is used to directly detect the pressing force of the adjusting cylinder 142 against the toggle lever 143 and thus also to indirectly detect the adjusting force with which the supporting shell is pressed against the work roll 10 .
- Page 10 of the supporting shell is carried out with the help of generally known conversion formulas from mechanics/kinematics based on the toggle lever 143 used here. The same applies to the conversion of the force.
- the formation of the adjusting mechanism with the toggle lever 143 shown here is by no means mandatory; on the contrary, in principle other constructive solutions are also conceivable and suitable for the horizontal adjustment of the supporting shells.
- the support shells 120 are typically attached to the support bridges; however, they can also be designed in one piece with them. According to the invention, it is of central importance that the supporting bridges 130 have a flexural rigidity that is greater than the flexural rigidity of the adjustment mechanism 140 in connection with the longitudinal sides of the cassette base body that receive or support the adjustment mechanism. In other words, the support bridge as such must be so rigid that it does not yield to deflection of the work rolls in the horizontal direction, i. H. also under
- FIG. 5 shows a horizontal section through the cassette 100 installed in a roll stand.
- the support shell with the support bridge 130 preferably extends over the entire length of the work roll 10, but at least over a large part of its length.
- the adjustment mechanisms could also only be in the form of an adjustment cylinder 143 - without a toggle lever - which moves the support bridge 130 with support against the longitudinal side of the
- Adjusting cylinder does not extend in the horizontal direction, but is installed vertically and then presses on the support bridge 130 via the toggle lever 143 shown. 4 has the advantage over the embodiment shown in FIG. 5 that it is more compact in the width direction and allows the cassette to be inserted into the receptacles of the very narrow stand windows of a roll stand.
- FIG. 5 also shows the terms “drive side” and “operating side”.
- the drive side designates the side on which a drive for the work roll is typically provided and the operating side designates the side without a drive from where a roll change typically takes place.
- the illustration on the left in FIG. 5 shows the cassette or the roll stand 50 in an unloaded state, i. that is, in a state where no horizontal forces in particular are applied to the work roll.
- the right-hand image in FIG. 5 shows the horizontal load condition.
- the rolling force which originally acts vertically, causes the intermediate roll 20 and the work roll 10 to be mounted slightly asymmetrically vertically, especially when the
- the invention provides for the support bridge 130, as mentioned, to be designed with a greater flexural rigidity than the flexural rigidity of the at least one adjustment mechanism in connection with the longitudinal side of the cassette base body 110 that accommodates the adjustment mechanism.
- the target positions of all adjustment cylinders 142 on the bending side are changed, in particular increased, typically starting from the initial target positions, until the adjustment forces individually applied by the adjustment cylinders 142 on the bending side 120 each have reached a specified target prestressing force Fv, preferably uniformly for all adjusting cylinders on the bending side.
- the difference in the contact forces F3-F1, F4-F2 of at least one pair of the contact cylinders arranged opposite one another on the opposite supporting shells is first determined.
- the difference is then regulated to a predetermined expected value for the differential force by suitably varying the desired positions of at least one of the opposing adjusting cylinders S3, S1 involved; S4,S2.
- the adjusting mechanism 140 which is designed to be less rigid than in the prior art, is at least partially compensated for by this regulation.
- the previously mentioned initial target position values for the adjusting cylinders s1 set ... s4 set, the set value for the preload force Fv and/or the set values of the expected value for the differential force AF are calculated using a process model based on at least one of the following input variables: a predicted rolling force, a predicted rolling moment, predicted strip tensions on the rolling stock to be rolled by the roll stand, the geometry of the bearing shell 120, the state of wear of the bearing shell, the roll diameter, the desired value for the fluid pressure p between the bearing shell 120 and the work roll; see figure 7.
- each of the two cassettes is equipped with an operator-side and a drive-side adjusting cylinder 142 on the bending side and the non-bending side, respectively. At least the adjusting cylinders 142 on the non-bending sides are set to their original desired starting position s1 desired - s4 desired as working points.
- the target positions of all four adjusting cylinders 142 on the non-bending sides of the two cassettes 100-o, 100-u are preferably the same as their starting target positions increased or decreased. During rolling, this results in a respectively desired reduction in thickness of the rolling stock.
- the target positions of the two adjustment cylinders on the operating side of the upper and lower cassette - each on the non-bending side - are changed by +As.
- the target positions of the two drive-side adjusting cylinders 142 of the upper and lower cassettes are then changed by ⁇ As—each on the non-bending side.
- the target positions of the operator-side adjusting cylinder of the upper cassette and the drive-side adjusting cylinder of the lower cassette are each on the non-bending side compared to their starting target positions by one, preferably the same Amount increased or decreased.
- the target positions of the drive-side adjusting cylinder of the upper cassette and the operator-side adjusting cylinder of the lower cassette are each lowered or increased by the same amount on the non-bending side compared to their starting target positions.
- the change amounts are manipulated variables that can be specified by thickness or flatness control systems, for example in combination with strip thickness measuring devices or flatness measuring rollers.
- the advantage is the more direct penetration in the greater vicinity of the metal strip compared to the main position, which is associated with a larger hysteresis.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021205156.1A DE102021205156A1 (de) | 2021-05-20 | 2021-05-20 | Kassette für zumindest eine Arbeitswalze in einem Walzgerüst |
| PCT/EP2022/057590 WO2022242933A1 (de) | 2021-05-20 | 2022-03-23 | Kassette für zumindest eine arbeitswalze in einem walzgerüst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4341013A1 true EP4341013A1 (de) | 2024-03-27 |
Family
ID=81384905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22718101.3A Pending EP4341013A1 (de) | 2021-05-20 | 2022-03-23 | Kassette für zumindest eine arbeitswalze in einem walzgerüst |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4341013A1 (de) |
| JP (1) | JP7701478B2 (de) |
| DE (1) | DE102021205156A1 (de) |
| WO (1) | WO2022242933A1 (de) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160167097A1 (en) * | 2013-07-22 | 2016-06-16 | Fives Dms | Rolling mill provided with at least one cooling nozzle |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH587688A5 (de) * | 1975-02-13 | 1977-05-13 | Escher Wyss Ag | |
| JPS59101206A (ja) * | 1982-11-30 | 1984-06-11 | Ishikawajima Harima Heavy Ind Co Ltd | 圧延機 |
| SE8300169L (sv) * | 1983-01-14 | 1984-07-15 | Strandell Per Olof | Anordning vid valsverk |
| JP2001232402A (ja) * | 2000-02-23 | 2001-08-28 | Hitachi Ltd | 板材圧延機および板材圧延方法 |
| JP4369934B2 (ja) | 2006-04-10 | 2009-11-25 | 新日本製鐵株式会社 | 圧延機の変形特性同定方法 |
| DE102009060640A1 (de) | 2009-07-07 | 2011-01-13 | Sms Siemag Ag | Clusterarmanordnung für die Zwischenwalzensätze von 18 HS Walzgerüsten |
| DE102009058358A1 (de) * | 2009-12-15 | 2011-06-16 | Sms Siemag Ag | Walzgerüst und Verfahren zum Betreiben eines Walzgerüsts |
| DE102020203076A1 (de) | 2020-03-11 | 2021-09-16 | Sms Group Gmbh | Walzgerüst zum Walzen von Metallband |
-
2021
- 2021-05-20 DE DE102021205156.1A patent/DE102021205156A1/de active Pending
-
2022
- 2022-03-23 WO PCT/EP2022/057590 patent/WO2022242933A1/de not_active Ceased
- 2022-03-23 JP JP2023571462A patent/JP7701478B2/ja active Active
- 2022-03-23 EP EP22718101.3A patent/EP4341013A1/de active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160167097A1 (en) * | 2013-07-22 | 2016-06-16 | Fives Dms | Rolling mill provided with at least one cooling nozzle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2024519047A (ja) | 2024-05-08 |
| WO2022242933A1 (de) | 2022-11-24 |
| JP7701478B2 (ja) | 2025-07-01 |
| DE102021205156A1 (de) | 2022-11-24 |
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