RU2487772C2 - Method of cooling strip hot rolling mill working rolls and device to this end - Google Patents

Method of cooling strip hot rolling mill working rolls and device to this end Download PDF

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RU2487772C2
RU2487772C2 RU2011121581/02A RU2011121581A RU2487772C2 RU 2487772 C2 RU2487772 C2 RU 2487772C2 RU 2011121581/02 A RU2011121581/02 A RU 2011121581/02A RU 2011121581 A RU2011121581 A RU 2011121581A RU 2487772 C2 RU2487772 C2 RU 2487772C2
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Russia
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cooler
flow rate
barrel
roll
working
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RU2011121581/02A
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Russian (ru)
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RU2011121581A (en
Inventor
Эдуард Александрович Гарбер
Александр Ерахмильевич Тикоцкий
Вадим Владимирович Румянцев
Владимир Константинович Кривовяз
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Государственное образовательное учреждение высшего профессионального образования "Череповецкий государственный университет"
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Priority to RU2011121581/02A priority Critical patent/RU2487772C2/en
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Abstract

FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy and is intended for correction of roll barrel heat profile correction. Proposed method comprises feeding liquid coolant jets on roll barrel surface to form set of flows parallel with roll axis and controlling coolant flow rate in every flow. Note here that coolant flow rate in one part of flows is distributed symmetrically about roll barrel centre while in another part of flows it is distributed asymmetrically about roll barrel centre with smooth reduction of flow rate in these flows from maximum to minimum magnitude over barrel working section. Note also that in one part of asymmetric flows, flow rate is reduced in direction from left edge to right edge while in another part it is reduced in opposite direction. Proposed device comprises sets of manifolds each being composed of three manifolds with different-capacity atomisers arranged as required in manifolds.
EFFECT: efficient and smooth correction of roll barrel active generatrix profile.
9 cl, 2 dwg

Description

The group of inventions relates to the field of metallurgy, in particular, to rolling production, and relates to a technology for cooling the working rolls of a strip hot rolling mill and a device for its implementation.
A known method of cooling the working rolls of a strip hot rolling mill, comprising supplying liquid cooler jets to the barrel surface of each roll, forming streams parallel to the roll axis, flow control and flow control of the cooler in each stream [1 p.193-197].
There is also known a device for cooling the working rolls of a strip hot rolling mill, comprising at least one group of collectors with nozzles mounted parallel to the roll axis on each roll, valves and flow meters for controlling the flow and controlling the flow rate of the cooler supplied through each collector [1 p. 206-210].
This method and this device are closest to the inventions of the group in terms of the totality of features and can be taken for the closest analogues.
The known method does not provide for the selection of such cooling regimes of the working rolls of the mill that would create the most efficient heat transfer between the working roll and coolant along the entire length of the roll barrel, taking into account the real profile of the active forming roll, which is a superposition (geometric sum) of the heat profile curves roll profile and its elastic deformation. As a result, according to research data [2], the real thermal profile of the roll barrel is often asymmetric with respect to the middle of the barrel, which leads to uneven, asymmetric wear of the roll barrel and further distorts the transverse profile of the strip, leading to its wedge shape.
In order to eliminate the asymmetry with respect to the middle of the roll barrel of its thermal profile, it is necessary to provide a flexible and smooth, adequately responsive to the asymmetry of the thermal profile of the roll, regulation of the distribution of the flow rate of the cooler along the length of the roll barrel. Existing cooling systems for rolls of broadband hot rolling mills (SHPSGP) realize only a symmetric distribution of the flow rate of the cooler with respect to the middle of the roll barrel. It is impossible to apply separate individual control of the flow rate of the cooler in each nozzle for SHPSGP rolls, as is the practice on cold rolling mills, since the SHPSGP work rolls are cast iron, and with sharp changes in the cooling intensity along the barrel length cracks arise in them due to temperature stresses.
As for the known device, it, accordingly, being intended to implement the known method, also does not provide the possibility of an optimal controlled mode of cooling the roll along the length of its barrel, adequately responding to symmetry breaking of the thermal profile of the roll.
The objective of the invention is the provision of flexible regulation of the distribution of the flow rate of the cooler along the length of the barrel, compensating for the possible asymmetry of the heat profile of the roll, while ensuring smoother heat transfer between the work roll and the cooler along the entire length of the barrel, eliminating sudden temperature jumps on the surface of the roll along the length of its barrel.
The specified problem, in terms of the method, is solved by the fact that in the method of cooling the working rolls of the strip hot rolling mill, comprising supplying liquid cooler jets to the surface of the barrel of each roll, forming a group of streams parallel to the roll axis, controlling the flow and controlling the flow rate of the cooler in each stream, according to the invention, in one part of the flows, the flow rate of the cooler is distributed symmetrically relative to the middle of the roll barrel, and in the other part of the flows, asymmetrically relative to the middle of the roll barrel, gradually reducing in these flows coolant flow along the length of the working portion of the barrel from maximum to minimum in some asymmetric flows - in the direction from the left to the right edge of the working portion of the barrel, in other - on the contrary.
In addition, three cooler flows are supplied to the surface of the roll barrel in a group, of which in one flow the cooler is distributed symmetrically relative to the middle of the roll barrel, and in the other two, asymmetrically relative to the middle of the roll barrel, and in one of the asymmetric flows, the cooler is fed to the left edge of the barrel’s working section, with the minimum - to the right edge of the barrel’s working section, and in the other - on the contrary, the cooler with the maximum flow rate is fed to the right edge of the barrel’s working section, and with the minimum - to the left its edge.
In addition, at least one more group of cooler flows is additionally fed to the roll barrel surface, similar in composition to the flows in terms of the composition of the flows and the nature of the distribution of cooler costs, i.e. each group includes a stream with a symmetric distribution of cooler flow relative to the middle of the roll barrel and two streams with an asymmetric distribution of cooler flow relative to the middle of the roll barrel.
In addition, in each stream with a symmetric distribution of the flow rate of the cooler, a cooler with the same flow rate along the entire length of this zone is supplied to the central zone of the working section of the roll barrel.
In addition, the total flow rate of the cooler in each stream is changed, regardless of the flow rate in other flows or in groups of flows, while maintaining the nature of the distribution of the flow rate of the cooler along the length of the working section of the roll barrel in each flow.
In addition, in at least one of the flows with an asymmetric distribution of the flow rate of the cooler, this flow rate is reduced to zero.
In addition, in flows with an asymmetric flow rate of the cooler, a cooler with the same minimum flow rate equal to the length of this section is supplied to the non-working end section of the roll barrel adjacent to the place of minimum flow of the cooler, and to the non-working end section of the roll barrel adjacent to the place of maximum cooler flow rate, the cooler is supplied with a flow rate, then gradually decreasing from maximum to minimum.
In the part of the device, this problem is solved by the fact that in the device for cooling the working rolls of the strip hot rolling mill, containing on each roll at least one group of collectors with nozzles installed parallel to the roll axis, valves and flow meters for controlling the flow and controlling the flow rate of the cooler, fed through each collector, according to the invention, each group is made of three collectors with nozzles in each different throughput, while on one of the nozzle collectors, in which such ability coincides, they are installed symmetrically relative to the middle of the roll barrel and so that the group of nozzles with maximum throughput is installed against the central zone of the working section of the roll barrel, having a width of 0.8-0.9 of the minimum strip width in the rolled product range, and against each of two adjacent lateral zones of the working section of the nozzle roll barrel barrel are installed with a sequential decrease in their throughput from the central zone to the edges; and on the other two collectors of the group there are nozzles with a capacity that smoothly and monotonically changes from one edge of the working section of the roll barrel to the other, asymmetrically relative to the middle of the barrel, while nozzles with a maximum capacity in these collectors are installed respectively opposite to different edges of the working section of the barrel.
In addition, in collectors with asymmetrically varying nozzle flow rates, nozzles with the same minimum throughput in one of these sections and with gradually decreasing throughput from maximum to minimum in the other section are installed opposite the non-working end sections of the roll barrel.
The invention consists in the following. In the process of hot rolling of a strip, asymmetry with respect to the middle of the barrel of one of its profile components, the thermal profile, and, therefore, asymmetry of the real profile of the active generatrix of the work roll, which leads to distortion of the transverse profile of the strip being rolled, often arise. To adjust the barrel’s thermal profile, i.e. controlling its shape, it is necessary to control the distribution of the flow rate of the cooler along the length of the roll barrel in the collectors. The inventions provide for distributing a part of the flow rate of the cooler along the length of the working part of the barrel according to an asymmetric scheme - in some collectors, the maximum flow rate of the cooler is fed to the right edge of the working section of the roll barrel, in others, the maximum flow rate of the cooler is fed to the left edge of the working section of the roll barrel, this smoothly reduces the flow rate of the cooler in each collector towards the opposite edge of the barrel.
To implement such a distribution of the flow rate of the cooler, the inventions provide an ordered arrangement in each collector of the nozzle cooling system with different throughputs. At the same time, it is possible to control the flow rate in all nozzles of each collector at the same time by changing the total flow rate of the cooler supplied to this collector, and the flow rate of the cooler in each collector is controlled independently of other collectors. This allows you to smoothly reduce or increase costs in all nozzles, in proportion to their flow capacity, without drastic changes in flow in neighboring nozzles, which eliminates local overheating and eliminates the possibility of cracks on the roll barrel. Obtaining the necessary distribution of the cooler costs along the length of the roll barrel is achieved by combining the costs supplied through different collectors: with a symmetric and asymmetric distribution of the cooler flow.
The invention is illustrated in figure 1, figure 2.
Figure 1 shows a diagram of the distribution of the flow rate of the cooler in the collector with a nozzle distribution symmetrical relative to the middle of the roll;
Figure 2 shows the diagram of the distribution of the flow rate of the cooler in the collector with the distribution of nozzles asymmetric with respect to the middle of the roll, with the installation of nozzles with the maximum flow rate of the cooler - to the right.
In figure 1, figure 2, the positions indicate the distribution of flow rate of the cooler:
figure 1: 1 - on the left side zone of the working section of the roll barrel,
2 - in the Central zone of the working section of the roll barrel,
3 - on the right side zone of the working section of the roll barrel;
figure 2: 4 - on the left end non-working part of the roll barrel,
5 - on the working section of the roll barrel,
6 - on the right end non-working part of the roll barrel.
The following is a specific example of the implementation of the inventions in relation to the operation of the cooling system of the work rolls of the finishing stand of the hot rolling sheet mill 2000. The crate is equipped with three collectors for cooling the rolls, with nozzles of various capacity, ordering placed on each collector. On one collector, nozzles are placed symmetrically with respect to the middle of the roll barrel in their capacity, providing the largest (5.21 m 3 / h) uniformly distributed flow rate of the cooler for each nozzle in the central zone, the width of which on the rolls is 0.85 minimum (1050 mm) the width of the strip rolled at the mill assortment, and a smooth decrease in flow rate to 0.2 from the maximum on the lateral zones of the working section of the barrel towards the edges of this section (figure 1).
The other two collectors have nozzles installed asymmetrically with respect to the middle of the barrel in capacity; in one of these two collectors, the flow rate of the cooler is maximum on the right edge of the working section of the roll barrel (5.21 m 3 / h), and in the other, the flow rate of the cooler is maximum on the left edge the working section of the roll barrel, and the throughput of the nozzles in each of them gradually decreases to 1.05 m 3 / h towards the opposite edge of the working section of the barrel. Opposite the non-working end sections of the barrel free from the strip, several nozzles are installed with the same minimum flow rate of 1.05 m 3 / h in the area adjacent to that edge of the working section where the flow rate of the cooler is minimal, and with a flow rate gradually decreasing from maximum to minimum, in the area adjacent to that edge of the working area where the flow rate of the cooler is maximum. Thus, in areas free from the strip, the distribution of the flow rate of the cooler is also carried out asymmetrically, as shown in the diagram (figure 2.)
In another collector with an asymmetric distribution of the flow rate of the cooler, the nozzles in their capacity are mirrored relative to the middle of the roll barrel with respect to the diagram shown in FIG. 2.
When a wedge-shaped appearance appears in the transverse profile of the strip (due to a violation of the symmetry of the thermal profile of the roll barrel) individually, independently of other collectors, the total flow rate of the cooler in one of the asymmetric collectors (the same direction of asymmetry that arose on the strip) was increased to 1.35 of the initial one, and the flow rate of the cooler through each nozzle of this collector. The nature of the distribution of the flow rate of the cooler along the length of the barrel with this regulation was preserved, but the shape of the total diagram of the distribution of the total flow rate of the cooler entering the roll barrel from all three collectors (as a result of adding the flow distribution diagrams in all collectors) changed. The increase in flow in all nozzles of the specified collector occurred in proportion to their flow capacity, without sharp drops in flow between adjacent nozzles, which excluded the appearance of cracks on the roll barrel.
In order not to increase the overall cooling rate of the roll barrel, while maintaining the total flow rate, on the collector where the nozzles are placed symmetrically, the flow rate was reduced to 0.65 of the original one.
As a result of these measures, it was possible to minimize the distortion of the transverse profile of the strip to acceptable specifications.
In another case, when a more significant wedge-shaped strip appeared, the second asymmetric collector was turned off altogether, as a result of which it was also possible to correct the indicated defect in the shape of the strip.
Thus, the testing of inventions showed that the technical result is fully achieved.
Information sources
1. Technical progress of cooling systems of rolling mills. Garber E.A., Goncharsky A.A., Sharavin M.P. - M.: Metallurgy, 1991, p. 193-197, 206-210.
2. E.A. Garber, M.V. Khlopotin et al. Improving the cooling efficiency of rolls of a broadband hot rolling mill using adaptive mathematical models of heat balance // Rolled products production. 2009. No4. S.12-24.

Claims (9)

1. A method of cooling the working rolls of a strip hot rolling mill, comprising supplying a liquid cooler stream to the barrel surface of each roll, forming a group of streams parallel to the roll axis, controlling the flow and controlling the flow rate of the cooler in each flow, characterized in that in one part of the flows the flow rate of the cooler distribute symmetrically with respect to the middle of the roll barrel, and in another part, asymmetrically with respect to the middle of the roll barrel with a smooth decrease in these flows of cooler consumption along the length of the barrel’s working section from Maximum Feed to a minimum, in one part of the asymmetric flow - in the direction from the left to the right edge of the working portion of the barrel, on the other side - in the opposite direction.
2. The method according to claim 1, characterized in that three cooler flows are supplied to the surface of the roll barrel in a group, of which in one flow the cooler is distributed symmetrically relative to the middle of the roll barrel, and in the other two asymmetrically relative to the middle of the roll barrel, and in one from asymmetric flows, the cooler with the maximum flow rate is fed to the left edge of the barrel’s working section, with the minimum it is fed to the right edge of the barrel’s working section, and in the other, the cooler with the maximum flow rate is fed to the right edge of the barrel’s working section, and with the minimum nym - on its left edge.
3. The method according to claim 2, characterized in that at least one more group of cooler flows is additionally fed to the surface of the roll barrel, similar in composition to the flows in terms of the composition of the flows and the nature of the distribution of cooler costs, each of which includes a stream with a symmetric distribution of the flow rate of the cooler relative to the middle of the roll barrel and two flows with an asymmetric distribution of the flow rate of the cooler relative to the middle of the roll barrel.
4. The method according to any one of claims 1 to 3, characterized in that in each stream with a symmetric distribution of the flow rate of the cooler, a cooler with the same flow rate over the entire length of this zone is supplied to the central zone of the working section of the roll barrel.
5. The method according to any one of claims 1 to 3, characterized in that the total flow rate of the cooler in each stream is changed regardless of the flow rate in other flows or in groups of flows, while maintaining the nature of the distribution of the flow of cooler along the length of the working section of the roll barrel in each stream .
6. The method according to claim 5, characterized in that, in at least one of the flows with an asymmetric distribution of the flow rate of the cooler, the flow rate is reduced to zero.
7. The method according to any one of claims 1 to 3, characterized in that in flows with an asymmetric flow rate of the cooler to the inoperative end section of the roll barrel adjacent to the place of the minimum flow rate of the cooler, a cooler is supplied with a minimum flow rate equal to the length of this section, and the inoperative end portion of the roll barrel adjacent to the place of maximum flow rate of the cooler serves the cooler with a flow rate that is smoothly reduced from maximum to minimum.
8. A device for cooling the working rolls of a strip hot rolling mill, comprising at least one group of collectors with nozzles mounted parallel to the roll axis on each roll, valves and flow meters for controlling the flow and controlling the flow rate of the cooler supplied through each collector, characterized in that each group is made of three collectors with nozzles of different throughputs in each of them, on one of the nozzle collectors, where the throughput matches, are installed symmetrically rel relative to the middle of the roll barrel in such a way that the group of nozzles with maximum throughput is installed opposite the central zone of the working section of the roll barrel, having a width of 0.8-0.9 from the minimum strip width in the rolled product range, and opposite each of the two adjacent side zones of the working section nozzle rolls are installed with a sequential decrease in their throughput from the central zone to the edges, while nozzles with a throughput changing at two other collectors of the group are installed along the length of the collector from minimum to maximum, smoothly and monotonously from one edge of the working section of the roll barrel to the other, asymmetrically relative to the middle of the barrel, with nozzles with maximum throughput in these collectors mounted respectively opposite to different edges of the working section of the barrel.
9. The device according to claim 8, characterized in that in collectors with an asymmetrically varying capacity of the nozzles, nozzles with the same minimum throughput in one of these sections and with gradually decreasing from the maximum to minimum throughput on the other are installed opposite the inoperative end sections of the roll barrel plot.
RU2011121581/02A 2011-05-27 2011-05-27 Method of cooling strip hot rolling mill working rolls and device to this end RU2487772C2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2743562C1 (en) * 2020-07-03 2021-02-19 Федеральное государственное автономное образовательное учреждение высшего образования "Южно-Уральский государственный университет (национальный исследовательский университет)" ФГАОУ ВО "ЮУрГУ (НИУ)" Roll cooling device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU275968A1 (en) * WORKING CHIP OF THE ROLLER MILL OF COLD PIPE ROLLING .. ^. JrT-eb --'- '"^ -' ^^^" ^ ._. _. . „F ^ -r ^^ - ^ ® ^ -V.
GB1397136A (en) * 1971-07-17 1975-06-11 Centro Speriment Metallurg Device and method for cooling hot-rolled metallic strips
SU740328A1 (en) * 1978-01-04 1980-06-15 Магнитогорский государственный институт по проектированию металлургических заводов Apparatus for cooling rolled sheets
SU908848A1 (en) * 1980-02-11 1982-02-28 Донецкий научно-исследовательский институт черной металлургии Apparatus for cooling rolled stock
RU42776U1 (en) * 2004-10-08 2004-12-20 Дригун Эрнст Михайлович Sheet cooling device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU275968A1 (en) * WORKING CHIP OF THE ROLLER MILL OF COLD PIPE ROLLING .. ^. JrT-eb --'- '"^ -' ^^^" ^ ._. _. . „F ^ -r ^^ - ^ ® ^ -V.
GB1397136A (en) * 1971-07-17 1975-06-11 Centro Speriment Metallurg Device and method for cooling hot-rolled metallic strips
SU740328A1 (en) * 1978-01-04 1980-06-15 Магнитогорский государственный институт по проектированию металлургических заводов Apparatus for cooling rolled sheets
SU908848A1 (en) * 1980-02-11 1982-02-28 Донецкий научно-исследовательский институт черной металлургии Apparatus for cooling rolled stock
RU42776U1 (en) * 2004-10-08 2004-12-20 Дригун Эрнст Михайлович Sheet cooling device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ГАРБЕР Э.А. и др. Технический прогресс систем охлаждения прокатных станов. - М.: Металлургия, 1991, с.193-197. 206-210. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2743562C1 (en) * 2020-07-03 2021-02-19 Федеральное государственное автономное образовательное учреждение высшего образования "Южно-Уральский государственный университет (национальный исследовательский университет)" ФГАОУ ВО "ЮУрГУ (НИУ)" Roll cooling device

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