EP4486523A1 - Abstreifvorrichtung - Google Patents
AbstreifvorrichtungInfo
- Publication number
- EP4486523A1 EP4486523A1 EP23704897.0A EP23704897A EP4486523A1 EP 4486523 A1 EP4486523 A1 EP 4486523A1 EP 23704897 A EP23704897 A EP 23704897A EP 4486523 A1 EP4486523 A1 EP 4486523A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coolant
- nozzle
- work roll
- roll
- tip
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
- B21B45/0275—Cleaning devices
- B21B45/0278—Cleaning devices removing liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
-
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
- B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
Definitions
- the invention relates to a scraping device for applying a coolant to the surface of a work roll in a roll stand and for sealing off a rolling stock rolled with the help of the work roll from the coolant otherwise flowing down from the work roll.
- the invention relates to a system consisting of the stripping device according to the invention and a positioning device for positioning the stripping device against the work roll and a roll stand with said system.
- the invention also relates to a method for operating said system.
- the European patent application EP 0 662 359 A1 discloses a stripping device with an internal cooling channel, which opens into a gap nozzle, for applying a fluid, in this case air, to the surface of a work roll in the outlet of a roll stand.
- the function of this The scraper device is based on the phenomenon of the Prandtl-Meyer corner flow, a phenomenon that occurs at extremely high air speeds, such as the speed of sound, so that an injector-shaped outlet of the air forms a negative pressure.
- the stripping device is not intended for direct contact with the surface of the work roll; rather, a gap, albeit a small one, remains between the surface of the work roll and the tip of the scraper.
- the adjustment has the disadvantage that the wiper tip and the curved flow guide surface, which together form the slotted nozzle in EP 0 662 359 A1, are then subject to wear as a result of abrasion.
- the result of this abrasion of the curved flow guide surfaces would be a change in the geometry of the outlet of the slotted nozzle, which would lead to an uncontrolled exit of the high-energy air stream from the slotted nozzle.
- the invention is based on the object of further developing a known stripping device with a cooling channel for applying a liquid coolant to the work roll, a known system consisting of the known stripping device and an adjusting device, a known roll stand with the system and a method for operating the system to the effect that that the aforesaid disadvantage of an undesired change in the geometry of the outlet opening of the slot nozzle when the stripping device is set against the surface of the work roll is effectively prevented.
- the scraping device is characterized in that the upper and the lower flow guide surface - starting from the outlet opening of the slotted nozzle - at least over a predetermined wear length I of the slotted nozzle in the depth direction y at an angle of less than 15° in the direction of flow of the coolant, converging or diverging to one another , are preferably formed parallel to one another.
- bottom refers to the spatial arrangement of the stripping device according to the invention shown in the figures.
- the scraper tip and the slotted nozzle are subject to abrasion in the area of wear length I, particularly during hot rolling the wear length is geometrically unchanged and remains so, even if the scraping device is set against a work roll and the gap nozzle is thereby worn away and increasingly shortened at its end on the cooling water outlet side due to the setting.
- the cooling of the work roll and the cooling efficiency are therefore when using the slot nozzle according to the invention, advantageously not adversely affected even in the event of their wear.
- the cooling efficiency is also comparatively high because the distance between the front end of the stripper tip or the surface of the work roll and the outlet opening of the slotted nozzle is only small. This applies equally to an upper and a lower work roll in the roll stand.
- the two preferably parallel flow guide surfaces can be uneven, e.g. wavy, also in the present invention.
- the exit angle at which the cooling medium exits the slotted nozzle would then change, depending on the abrasion of the slotted nozzle caused by wear.
- a nozzle cover plate the underside of which forms the upper flow guide surface of the slotted nozzle, and/or the wiper tip are each detachably fastened to the base body as a wear part. In the event of wear and tear, they can then advantageously be easily separated from the base body and inexpensively replaced by corresponding new parts.
- the nozzle cover plate formation is made of a softer material than the wiper tip. This ensures that the coolant flows out even if the scraper tip is worn, since a flow can be directed onto the roll surface in any case.
- the collection space is divided into a plurality of zones in the width direction, which can be individually switched on or shut off for the flow of the coolant through the slotted nozzle—depending on the requirements in the individual case.
- Individual connections for the supply of the coolant are preferably also assigned to the individual zones.
- the individual and/or group control of the coolant supply in the individual zones advantageously allows the cooling capacity of the scraping device to be adjusted individually in zones and optionally also in terms of quantity across the width.
- a separating plate is arranged between the upper and the lower flow guiding surface, which is designed in the form of a comb with tines, the tines being aligned towards the outlet opening of the slotted nozzle. At least some of the spaces between the tines are in fluid-conducting connection with the cooling channel, in particular with the collecting space for the coolant.
- the thickness of the separating plate determines the height of the slit nozzle and thus also the size of the opening cross-section of the slit nozzle. Due to the elongation of the tines in the depth direction, the spaces between the tines are also elongated.
- the coolant is advantageously already aligned by the tines before exiting the slotted nozzle for a right-angled exit from the slotted nozzle.
- the separating plate in combination with the collecting chamber located upstream, ensures an even distribution of the cooling water supplied in the area of the outlet opening of the slotted nozzle.
- the already mentioned optional formation of the zones within the slotted nozzle can take place on the one hand by appropriate blocking elements within the collection space. Alternatively, the zones can also be formed by a suitable design of the separating plate.
- the prongs with their respective interstices are then only to be formed in the width area of the slotted nozzle that should be open as a zone for the coolant to flow through; in the adjacent areas in the width direction of the slotted nozzle, which should be blocked for the passage of the coolant, this can be done by designing the separating plate without prongs.
- the separating plate then acts there as a seal for the collection space over the desired width areas. Openings of the cooling channel between the tines are then covered or closed by the separating plate, so that no more coolant can pass through.
- the system and the roll stand each also comprise a positioning device for positioning the stripping device against an upper and/or lower work roll.
- the scraper devices are then arranged above and/or below the rolled stock and in this way advantageously at least largely prevent contact of the upper side and/or the underside of the rolled stock with the coolant applied to the work roll by the scraper device.
- On the underside it does not necessarily require an adjustment device, because it can be sufficient there that the lower Stripping device is employed by the weight against the lower work roll.
- the claimed roll stand can have a control device or a regulating device for controlling or regulating the actual thermal crowning of the work rolls to a specified target crowning, the actual flatness of the rolling stock to a specified target flatness and/or the actual profile of the rolling stock to a have a predetermined target profile.
- the wiper device according to the invention then serves as an actuator in conjunction with a valve for the coolant that can preferably be activated by the control device or the regulating device.
- the stripping device is adjusted against the surface of the work roll and with the help of the valve, the speed at which the coolant emerges from the gap nozzle is suitably varied in such a way that the said actual values can be converted into the said target values.
- the zones within the scraping device can also be individually activated or deactivated in a suitable manner for the purpose mentioned.
- FIG. 1 shows the stripping device according to the invention in a longitudinal section
- FIG. 2 shows the stripping device according to the invention in an open state in a perspective plan view
- FIG. 3 shows the individual components of the slot nozzle according to the invention in an exploded view
- FIG. 4 shows the stripping device according to the invention with an associated adjusting device in a roll stand.
- FIG. 1 shows the stripping device 100 according to the invention in a longitudinal section.
- the scraping device 100 is used to apply a coolant to the surface of a work roll of a roll stand and to seal off a rolling stock rolled with the help of the work roll from the coolant.
- the scraper device 100 has a scraper tip 110 and a base body 120 as a support for the scraper tip 110 .
- the base body In its interior, the base body has a cooling channel 122 for the coolant.
- the outlet opening of the slotted nozzle 140 is set back in the depth direction y in relation to the front end 112 of the wiper tip.
- the cooling channel 122 is delimited within the slot nozzle by an upper flow guide surface 142 and a lower flow guide surface 144 .
- the lower flow guide surface 144 is advantageously formed by the upper side of the wiper tip 110, while the upper flow guide surface 142 is formed by the underside of a nozzle cover plate 146.
- the nozzle cover plate 146 can also be considered part of the wiper tip 110 .
- the upper and lower flow guide surfaces 142, 144 are in the case of the slotted nozzle according to the invention Slotted nozzle 140--starting from the outlet opening of slotted nozzle 140 for the coolant--are aligned parallel to one another at least over a predetermined wear length I of the slotted nozzle in depth direction y.
- the lower and the upper flow guide surface 144, 142 can also be designed to be planar or even, as shown in FIG.
- their flat design offers the advantage that the flow angle at which the coolant impinges on the surface of the work roll, given a constant angle of incidence of the scraper device 100 against the work roll 210, even with continuous abrasion of the Slot nozzle 140 remains constant.
- the nozzle cover plate 146 and/or the wiper tip 110 are advantageously detachably fastened to the base body 120 as wearing parts.
- cooling channel 122 is located upstream of the slotted nozzle 140 counter to the direction of flow -y of the coolant Having collection space 125 for the coolant, which preferably extends in the width direction x over the entire width of the slotted nozzle 140.
- the collection space 125 is covered with a cover plate 126 in FIG.
- FIG. 2 shows the stripping device 100 according to the invention in the open state in a perspective view.
- the stripping device is particularly open in FIG. 2 in that the cover plate 126 for the collection space and the nozzle cover plate 146 of the slotted nozzle 140 have been removed.
- FIG. 1 only shows the front part of the stripping device 100 up to the collecting space 125 in a longitudinal section
- FIG. 2 also shows the rear areas of the base body 120 with the connections 130 for supplying the coolant. It can be seen that the individual connections 130 for supplying the coolant are each assigned their own channels, which open into the collecting space 125 .
- the collecting chamber 125 is in fluid communication with the gaps between two adjacent prongs 155 of the separating plate 150 via the slots 159 that can be seen in FIG.
- the thickness of the separating plate 150 in the z-direction also defines the height of the opening of the slotted nozzle 140 and in this way also determines the size of the opening cross section of the slotted nozzle 140.
- the coolant as indicated by the arrows in FIG.
- the stripping device 100 can be divided into individual zones Z1 . . . Z4 in the width direction x.
- the subdivision into zones is optional and can be implemented, for example, by providing optional separating webs 127 within the collection space 125 .
- Each of the zones is then preferably assigned its own connection 130-i for supplying the coolant.
- individual zones can also be formed within the slot nozzle 140 in that the separating plate 150 is only provided with the said prongs 155 in the desired zones is trained. In the remaining areas in the width direction in which no zone or no discharge of the coolant is desired, this can also be realized in that the partition plate 150 is formed in these width areas in such a way that it covers the openings 158 . This would then prevent the coolant from escaping through these openings 158 in the respective width areas.
- FIG. 3 shows the structure of the slot nozzle 140 according to the invention again in an exploded view.
- the underside forms the wiper tip 110 with said openings 158 as fluid-conducting connections between the collecting chamber 125 and the spaces between the tines 155 of the partition plate 150.
- the upper side of the wiper tip 110 forms the said lower flow guide surface 144 of the slotted nozzle.
- the opposite upper control vane 142 is formed by the underside of nozzle cover plate 146 .
- the wiper tip 110, the separating plate 150 and the nozzle cover plate 146 are screwed together via an end plate 148.
- FIG. 4 shows a roll stand 200 with an upper and a lower work roll 210 for rolling rolled stock.
- the stripping device 100 according to the invention is preferably set against the upper work roll 210 in the outlet of the roll stand 200 with the aid of an upper adjusting device, for example a cylinder 160 .
- a lower stripping device 100 can also be provided for adjusting against the lower work roll 210 of the roll stand 200.
- a lower adjusting device is not necessarily required for adjusting the lower stripping device 100; as an alternative to a lower adjustment device, the lower stripping device can also be adjusted simply by utilizing the force of weight.
- the roll stand 200 advantageously has a control device or a regulating device 220 for controlling or Control of, for example, the thermal actual crowning of the work rolls 210 to a specified target crowning, the actual flatness of the rolling stock to a specified target flatness and/or the actual profile of the rolling stock to a specified target profile.
- the lower and/or upper stripping device 100 serves as an actuator in connection with a valve for the coolant that can be controlled by the control device or the regulating device.
- a valve for the coolant that can be controlled by the control device or the regulating device.
- the exit speed at which the coolant exits the slotted nozzle 140 of the respective wiper device 100 is suitably varied in such a way that the said actual values are set or regulated to the said specified target values.
- the aforesaid actuator is also suitable for zone-wise controlling the exit of the coolant in the width direction x.
- the stripping device 100 in conjunction with the adjusting device 160, forms the system within the meaning of the invention.
- the method according to the invention for operating the system according to the invention comprises in particular the following steps:
- the coolant is optionally pumped through the at least one connection 130, through the cooling channel 112 and through the slotted nozzle 140 onto the surface of the work roll 210 in the roll stand 200.
- the pressure or the volume flow with which the coolant flows out of the slotted nozzle 140 exits, is then suitably varied with the aid of said valve, controlled by the control device or regulating device 220, in such a way that at least one of the above-mentioned actual variables is set or regulated to the assigned, specified setpoint variables.
- the coolant is a cooling fluid, in particular water.
- Coolant pumping can be turned on or off; i.e. H. in certain operating conditions, it may be useful to the invention
- Squeegee device 100 to hire against the surface of a work roll 210 without escaping coolant.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022202100.2A DE102022202100A1 (de) | 2022-03-01 | 2022-03-01 | Abstreifvorrichtung |
| PCT/EP2023/053169 WO2023165797A1 (de) | 2022-03-01 | 2023-02-09 | Abstreifvorrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4486523A1 true EP4486523A1 (de) | 2025-01-08 |
| EP4486523B1 EP4486523B1 (de) | 2026-04-08 |
Family
ID=85227244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23704897.0A Active EP4486523B1 (de) | 2022-03-01 | 2023-02-09 | Abstreifvorrichtung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4486523B1 (de) |
| DE (1) | DE102022202100A1 (de) |
| WO (1) | WO2023165797A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1139460B (de) * | 1959-02-09 | 1962-11-15 | Theodor Wuppermann G M B H | Abstreifer fuer warm zu walzendes Walzgut |
| JPH02255206A (ja) * | 1989-03-28 | 1990-10-16 | Sumitomo Light Metal Ind Ltd | 圧延機冷却装置 |
| DE4422422A1 (de) | 1994-01-08 | 1995-07-13 | Schloemann Siemag Ag | Vorrichtung zum berührungsfreien Abdichten eines Spaltes im Auslauf eines Walzgerüstes |
| DE19737735A1 (de) * | 1997-08-29 | 1999-03-04 | Schloemann Siemag Ag | Vorrichtung und Verfahren zur auslaufseitigen Kühlung der Arbeitswalzen eines Walzgerüstes |
| DE102011084735A1 (de) * | 2011-10-18 | 2013-04-18 | Sms Siemag Ag | Abstreifer für eine Arbeitswalze eines Walzgerüsts |
-
2022
- 2022-03-01 DE DE102022202100.2A patent/DE102022202100A1/de active Pending
-
2023
- 2023-02-09 WO PCT/EP2023/053169 patent/WO2023165797A1/de not_active Ceased
- 2023-02-09 EP EP23704897.0A patent/EP4486523B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023165797A1 (de) | 2023-09-07 |
| DE102022202100A1 (de) | 2023-09-07 |
| EP4486523B1 (de) | 2026-04-08 |
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