CN114054543A - Multi-mode hot rolling temper mill and control method - Google Patents
Multi-mode hot rolling temper mill and control method Download PDFInfo
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- 238000005098 hot rolling Methods 0.000 title claims abstract description 34
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 94
- 229910000831 Steel Inorganic materials 0.000 claims description 114
- 239000010959 steel Substances 0.000 claims description 114
- 238000005096 rolling process Methods 0.000 claims description 25
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- 238000012937 correction Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 4
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- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
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- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
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- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
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Abstract
The invention provides a multi-mode hot rolling temper mill which comprises an uncoiler, an inlet steering roller, a straight head machine, a temper mill, an outlet steering roller and a coiler. Another aspect of the present invention provides a method of controlling a multi-mode hot rolling leveler, including: the multi-mode hot rolling temper mill according to any one of claims 2 to 5 has the following five production modes according to the production requirements of products with different specifications: the production mode of the rewinding machine comprises a rewinding production mode, an independent leveling production mode, a leveling and small-diameter straightening machine production mode, a leveling and large-diameter straightening machine production mode and an independent straightening machine production mode. The embodiment of the application provides the multi-mode hot rolling temper mill and the control method, solves the technical problems that in the prior art, a straightening machine is difficult to consider thick and thin products, the production efficiency is low, and the capacity of a temper mill unit is limited, and realizes high-efficiency and high-quality production of products with various specifications.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a multi-mode hot rolling temper mill and a control method.
Background
With the progress of technologies such as thin slab continuous casting and rolling, cooling after rolling, ultra-fast cooling and the like, the development and production of high-strength thin-specification hot-rolled strip steel products become hot spots of production lines of conventional hot continuous rolling, thin slab continuous casting and rolling and thin strip casting and rolling, such as DP series dual-phase steel, high-strength steel for commercial vehicles such as 700L and the like, SPA-H, 45Mn and other medium-high carbon steel. However, in the processes of rolling and cooling after rolling, the hot-rolled thin high-strength steel has wave-shaped defects which are difficult to avoid, and the control difficulty is high, which provides a challenge to the plate shape improvement capability of the hot-rolling flattening unit. A flattening unit matched with the existing hot rolling production line generally adopts a four-roller flattening machine, and the plate shape (including wave shape and warping) control capability of the four-roller flattening machine is difficult to solve the plate shape quality problem of the high-strength thin-specification hot rolling product.
In the hot-rolled strip steel straightening-flattening-straightening process method in the prior art, the plate shape control capability of a flattening unit on high-strength steel is improved in a flattening and straightening mode. But the sizes of the working roll and the bearing of the straightening machine are small, the limitation on the production speed is large, thick and thin products are difficult to be considered, the production efficiency is not high, the capacity of the flattening unit is limited, and a plurality of flattening production lines are needed to meet the production requirement of one hot continuous rolling production line.
Disclosure of Invention
The embodiment of the application provides the multi-mode hot rolling temper mill and the control method, solves the technical problems that in the prior art, a straightening machine is difficult to consider thick and thin products, the production efficiency is low, and the capacity of a temper mill unit is limited, and realizes high-efficiency and high-quality production of products with various specifications.
An aspect of an embodiment of the present application provides a multi-mode hot rolling leveler, including:
the uncoiler is used for uncoiling the steel coil to obtain strip steel;
the inlet steering roller is used for steering the strip steel and ensuring that the running direction of the inlet strip steel and a rolling line are stable;
the straight head machine is used for straightening the head and the tail of the strip steel after the inlet is turned;
the flattening machine is used for flattening the strip steel after the head and the tail are straightened;
the roller box replaceable straightening machine is used for straightening the leveled strip steel;
the outlet steering roll is used for steering the strip steel after being pulled and straightened and ensuring the running direction of the strip steel at the outlet of the straightener with the replaceable roll box and the stability of a rolling line;
and the coiling machine is used for coiling the strip steel after the outlet is turned.
Further, the roller box replaceable straightener comprises a first roller box and a second roller box;
the first roller box and the second roller box are both four-layer type straightening machines;
the first roller box comprises a first upper roller box and a first lower roller box, the first upper roller box comprises a first upper roller box frame, a first upper supporting roller and a first upper working roller, and the first lower roller box comprises a first lower roller box frame, a first lower supporting roller and a first lower working roller;
the second roller box comprises a second upper roller box and a second lower roller box, the second upper roller box comprises a second upper roller box frame, a second upper supporting roller and a second upper working roller, and the second lower roller box comprises a second lower roller box frame, a second lower supporting roller and a second lower working roller.
Further, the first upper working roll and the first lower working roll are small-diameter working rolls, the roll diameter is 40-60 mm, the number of the first upper working rolls is 9, the number of the first lower working rolls is 9, and the first roll box is used for producing thin-specification strip steel.
Further, the second upper working roll and the second lower working roll are large-diameter working rolls, the roll diameter is 80-100 mm, the number of the second upper working rolls is 6, the number of the second lower working rolls is 6, and the second roll box is used for producing thick-specification strip steel.
Further, the coiling machine is a high-tension coiling machine, the outlet tension T3 of the straightener with the replaceable roller box is ensured to be stable, and the outlet tension T3 of the straightener with the replaceable roller box, the inlet tension T2 of the straightener with the replaceable roller box and the inlet tension T1 of the leveler are ensured.
Maximum tension T3 at outlet of straightenermaxAnd the maximum tension T1 of the inlet of the temper millmaxThe condition described in the formula (1) is satisfied.
In the formula: t3max-maximum coiling tension of the coiler, t;
T1max-maximum unwinding tension, t, of the unwinder;
σmaxthe yield strength of the highest-strength strip steel producible by the production line is MPa;
b, the width of the highest-strength strip steel which can be produced by a production line is mm;
h is the thickness of the highest-strength strip steel which can be produced by a production line, mm;
lambda is correction coefficient, the value range [0.1, 0.5 ];
another aspect of the present embodiment provides a method for controlling a multi-mode hot rolling leveler, including:
according to the production requirements of products with different specifications, the multi-mode hot rolling temper mill has the following five production modes:
a rewinding production mode for inspecting strip steel quality or cutting off defects;
an individual leveling production mode for producing a product having a thickness specification of 3.5mm or more;
a production mode of a flattening and small-diameter straightening machine, wherein the production mode of the flattening and small-diameter straightening machine is used for producing high-strength steel products with the thickness specification of below 2.0 mm;
a production mode of a flattening and large-diameter straightening machine, wherein the production mode of the flattening and large-diameter straightening machine is used for producing high-strength steel products with the thickness specification of 2.0-3.5 mm;
and the production mode of the single straightener is used for producing the high-performance soft steel with the thickness specification of below 3.5 mm.
Further, in the rewinding production mode, both the temper mill and the roller box replaceable straightener are in an open state;
and in the independent leveling production mode, the roller box replaceable straightening machine is in an open state, and the leveling machine is produced at the speed of 600m/min at most.
Further, under the production mode of the flattening and small-diameter flattening machine, the first roller box is adopted by the flattening machine with the replaceable roller box, the wave shape control of the strip steel is realized through flattening rolling and large-tension straightening, the control of the warping of the high-strength steel is realized through the adjustment of the inlet and outlet pressing amount of the flattening machine with the replaceable roller box, and the flattening machine and the first roller box are produced at the speed of 200m/min at most.
Further, under the production mode of the flattening and large-diameter straightening machine, the second roller box is adopted by the straightening machine with the replaceable roller box, the wave shape of the strip steel is controlled by flattening rolling and large-tension straightening, the warping of the high-strength steel is controlled by adjusting the inlet and outlet pressing amount of the straightening machine, and the flattening machine and the second roller box are produced at the speed of 300m/min at the maximum.
Further, under the production mode of the single straightening machine, the flattening machine is in an open state. When the thickness of the strip steel is below 2.0mm, the straightener with the replaceable roller box adopts a first roller box, and the first roller box is produced at the speed of 200m/min at most; when the thickness of the strip steel is 2.0 mm-3.5 mm, the straightener with the replaceable roller box adopts a second roller box, and the second roller box is produced at the speed of 300m/min at most.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the application solves the problem that one set of roller box can not be taken into account in the production process of thin-specification high-strength steel (1.0-2.0 mm) and common-specification high-strength steel (2.0-3.5 mm) by adopting the structural design of the roller box replaceable straightening machine, and can flexibly organize the production of high-strength steel with different thickness specifications and different strength levels on the premise of ensuring the quality of the plate shape of a product by replacing the roller box.
Drawings
FIG. 1 is a schematic structural view of a multi-mode hot rolling leveler provided in an embodiment of the present application;
FIG. 2 is a schematic view of a roller box structure and a pressing-down view of a multi-mode hot rolling leveler with a replaceable roller box provided in an embodiment of the present application;
FIG. 3 is a flat yield trend graph according to the third embodiment of the present application;
FIG. 4 is a photograph showing that the high-strength steel of 700MPa class in the third embodiment of the present application has a good plate shape after being flattened.
Detailed Description
The invention provides a multi-mode hot rolling temper mill and a control method thereof, which solve the problems of control of thin-specification high-strength steel plate shapes, consideration of products of different steel specifications and limitation of the capacity of a temper mill set in the prior process of temper rolling of hot rolled products. The combined use of the uncoiler, the coiling machine, the steering roller, the temper mill and the roller box replaceable straightening machine can realize 5 production modes and realize the high-efficiency and high-quality production of products with various specifications.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The first embodiment,
As shown in fig. 1, the embodiment of the present application provides a multi-mode hot rolling leveler 4, which includes an uncoiler 1, an inlet turning roll 2, a straight head machine 3, a leveler 4, an exchangeable roll box leveler 5, an outlet turning roll 6, and a coiler 7. The uncoiler 1 is used for uncoiling a steel coil to obtain strip steel; the inlet steering roller 2 is used for steering the strip steel and ensuring the running direction of the inlet strip steel and the stability of a rolling line; the straight head machine 3 is of a roller system structure with an upper part 3 and a lower part 4 and is used for straightening the head and the tail of the strip steel after the inlet is turned; when the head of the strip steel passes through the head straightening machine 3, the strip steel is straightened, so that the strip steel can be conveniently threaded; after the tail part of the strip steel leaves the uncoiler 1, the strip steel is stably operated by clamping the straight head machine 3, and the inlet of the temper mill 4 has certain tension, so that the control effect of flattening the shape of the tail part of the strip steel is favorably ensured. The temper mill 4 is a common four-roller temper mill 4 and is used for temper the strip steel after the head and the tail are straightened; the roller box replaceable straightener 5 is used for straightening the flat strip steel; the outlet steering roller 6 is used for steering the pulled and straightened strip steel and ensuring the running direction and the rolling line of the strip steel at the outlet of the straightener with the replaceable roller box 5 to be stable; the coiling machine 7 is used for coiling the strip steel after the outlet is turned.
As shown in fig. 2, the roller box-replaceable leveler 5 includes a first roller box and a second roller box; the first roller box and the second roller box are both four-layer type straightening machines; the first roller box comprises a first upper roller box and a first lower roller box, the first upper roller box comprises a first upper roller box frame, a first upper supporting roller and a first upper working roller, and the first lower roller box comprises a first lower roller box frame 8, a first lower supporting roller 9 and a first lower working roller 10; the second roller box comprises a second upper roller box and a second lower roller box, the second upper roller box comprises a second upper roller box frame, a second upper supporting roller and a second upper working roller, and the second lower roller box comprises a second lower roller box frame, a second lower supporting roller and a second lower working roller. The first upper working roll and the first lower working roll are small-diameter working rolls, the roll diameter is 40-60 mm, the number of the first upper working rolls is 9, the number of the first lower working rolls is 9, and the first roll box is used for producing thin-specification strip steel. The second upper working roll and the second lower working roll are large-diameter working rolls, the roll diameter is 80-100 mm, the number of the second upper working rolls is 6, the number of the second lower working rolls is 6, and the second roll box is used for producing thick-specification strip steel. The upper and lower work rolls are staggered by the relative positions of the upper and lower roll cassettes, wherein the upper work roll is biased toward the outlet side and the lower work roll is biased toward the inlet side. The lower roller box is fixed in position, the upper roller box is pressed down, and the inlet and the outlet of the upper roller box are respectively provided with a pressing mechanism, so that the pressing amount of the inlet and the outlet of the roller box can be independently adjusted.
The coiling machine 7 is a high-tension coiling machine 7, the outlet tension T3 of the straightener with the replaceable roller box is ensured to be stable, and the outlet tension T3 of the straightener with the replaceable roller box is enabled to be more than the inlet tension T2 of the straightener with the replaceable roller box is enabled to be more than the inlet tension T1 of the straightener 4;
maximum tension T3 at outlet of straightenermaxAnd the maximum tension T1 of the inlet of the temper millmaxThe condition of formula (1) is satisfied:
in the formula: t3max-maximum coiling tension of the coiler, t;
T1max-maximum unwinding tension, t, of the unwinder;
σmaxthe yield strength of the highest-strength strip steel producible by the production line is MPa;
b, the width of the highest-strength strip steel which can be produced by a production line is mm;
h is the thickness of the highest-strength strip steel which can be produced by a production line, mm;
lambda is correction coefficient, and the value range is [0.1, 0.5 ].
Example two
The embodiment of the application provides a control method of a multi-mode hot rolling temper mill, which comprises the following steps: according to the production requirements of products with different specifications, the multi-mode hot rolling temper mill has the following five production modes:
and in the rewinding production mode, the rewinding production mode is used for inspecting the quality of the strip steel or cutting off defects, and the temper mill and the roller box replaceable straightening machine are both in an open state in the rewinding production mode.
An individual leveling production mode for producing a product having a thickness specification of 3.5mm or more; under the independent leveling production mode, the roller box-replaceable straightening machine is in an open state, the leveling machine is used for producing at the speed of 600m/min at most, the unit yield is improved, and the good control of the plate shape of the thick strip steel is realized through the adjustment of the rolling force and the roll bending force of the leveling machine.
Production modes of a flattening and small-diameter flattening machine are as follows: the production mode of the flattening and small-diameter straightening machine is used for producing high-strength steel products with the thickness specification of below 2.0 mm; under the production mode of the flattening and small-diameter straightening machine, the first roller box is adopted by the replaceable roller box straightening machine, the wave-shaped control of strip steel is realized through flattening rolling and large-tension straightening, and the control of the warping of high-strength steel is realized through the adjustment of the inlet and outlet pressing amount of the replaceable roller box straightening machine. Because a straightener with a changeable roller box is put into use, the leveler and the first roller box are produced at the speed of 200m/min at the maximum, and the leveling production speed is lower than that of an independent leveling mode.
Production modes of a leveling and large-diameter straightening machine are as follows: the production mode of the flattening and large-diameter straightening machine is used for producing high-strength steel products with the thickness specification of 2.0-3.5 mm; under leveling and major diameter straightener production mode, interchangeable roller box straightener adopts the second roller box draws through temper rolling and high tension and corrects, realizes the wave shape control of belted steel to through the adjustment of straightener entry and export decrement, realize the control to the high-strength steel warpage, the leveler with the second roller box adopts the speed production of maximum 300 m/min. Because of the input of the straightener with the replaceable roller box, the flattening production speed is lower than that of the independent flattening mode.
Production mode of the single straightening machine: the production mode of the single straightener is used for producing high-performance mild steel with the thickness specification of below 3.5mm, if low-carbon steel with the yield strength of less than 200MPa is required, the defects of wave shape and warping of strip steel can be eliminated by adopting smaller straightening elongation, and the excessive increase of the yield strength and the excessive reduction of the thickness of the strip steel caused by the flattening rolling deformation are avoided. In the production mode of the single straightener, when the thickness of the strip steel is below 2.0mm, the straightener with the replaceable roller box adopts a first roller box, and the first roller box is produced at the speed of 200m/min at most; when the thickness of the strip steel is 2.0 mm-3.5 mm, the straightener with the replaceable roller box adopts a second roller box, and the second roller box is produced at the speed of 300m/min at most. Because of the input of the straightener with the replaceable roller box, the flattening production speed is lower than that of the independent flattening mode.
EXAMPLE III
As shown in figures 3 and 4, a 1750mm thin slab continuous casting and rolling production line in a certain factory is mainly used for producing products such as hot-rolled container plates, hot-rolled thin high-strength carriage plates and the like by adopting the multi-mode hot-rolling temper mill and multiple production modes thereof, the width of the strip steel is 1175-1500 mm, the thickness of the strip steel is 0.8-4.5 mm, the yield reaches the highest 7.4 ten thousand tons per month, the monthly average yield of the conventional hot-rolling temper mill is close, the quality of the flattened strip steel is far higher than that of the conventional hot-rolling temper production line, and the production line has the characteristics of high efficiency and high quality.
Wherein, products such as 1.42 mm-1.48 mm thin hot-rolled container plates SPA-H, 1.5mm hot-rolled thin high-strength carriage plates 700BL, 1.5 mm-3.5 mm common hot-rolled high-strength steel and the like adopt a flattening and large-diameter straightening machine production mode, the maximum production speed is 300m/min, and the wave height and the warping height of the finished product strip steel are less than 3 mm.
Products such as thin hot-rolled ultrahigh-strength steel (yield strength is 980 MPa-1480 MPa) with the thickness of 1.2 mm-2.0 mm are produced by adopting a flattening and small-diameter straightening machine, the maximum production speed is 200m/min, and the wave height and the warping height of the finished product strip steel are less than 3 mm.
The conventional hot rolled products with the diameter of more than 3.5mm, such as Q235B, SPHC and the like, adopt a single flattening mode.
The high-performance mild steel with the thickness specification of below 1.5mm is produced by adopting a production mode of a single straightener if the low-carbon acid-washed plate (pipe making, door plate making and other purposes) with the shape needing to be flattened and improved is adopted, and the thickness reduction amount of the strip steel can be controlled within 1-2 mu m while the shape is improved. (Note: production line capability can produce products with a thickness of less than 3.5mm, but in the examples, such high performance mild steels are typically 0.8mm to 1.5mm thick)
The head and tail defects need to be cut off, and flat products such as internal cooling rolled substrates are not needed, and a rewinding mode is adopted.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. the application solves the problem that one set of roller box can not be taken into account in the production process of thin-specification high-strength steel (1.0-2.0 mm) and common-specification high-strength steel (2.0-3.5 mm) by adopting the structural design of the roller box replaceable straightening machine, and can flexibly organize the production of high-strength steel with different thickness specifications and different strength levels on the premise of ensuring the quality of the plate shape of a product by replacing the roller box. For example: by adopting a flat and small-diameter roller box, the wave shape and the warping height of the 1000 MPa-grade high-strength steel with the thickness of 1.2-1.5 mm can be controlled within 3 mm; by adopting a flat and large-diameter roller box, the wave shape and the warping height of the high-strength steel with the thickness of 2.0-3.0 mm and the level of 700MPa can be controlled within 3 mm. Otherwise, the wave shape and warping defects of the 1000MPa grade high-strength steel with the thickness of 1.2-1.5 mm cannot be eliminated only by adopting a flat and large-diameter roller box.
2. The method adopts the structural design of the roller boxes of the multi-roller straightener with the same number of upper and lower working rollers which are arranged in a staggered way (for example, the number of the upper and lower working rollers of the large-diameter roller box is 6, the number of the upper and lower working rollers of the small-diameter roller box is 9, as shown in figure 2, the upper working rollers of the multi-roller straightener are deviated to the outlet side), solves the problem that the control capability of upward warping and downward warping of the strip steel cannot be considered simultaneously, can enable the strip steel to warp downward by increasing the outlet pressing amount of the large-roller straightener, and can enable the strip steel to warp upward by increasing the inlet pressing amount of the large-roller straightener. Through the structural design of the straightening roller box in the form, the warping direction and the height of the strip steel can be flexibly controlled.
3. According to the tension control method, the high-tension coiling (the maximum tension of the coiler is more than or equal to 2 times of the maximum tension of the uncoiler) and the tension sectional control mode are adopted, the tension of the uncoiler and the coiler is set, the insertion quantity of the inlet and the outlet of the multi-roll straightening machine is set, the sectional control of the tension of the inlet of the temper mill, the outlet of the temper mill (namely the inlet of the multi-roll straightening machine) and the tension of the three positions of the multi-roll straightening outlet can be realized, the tension T3 of the outlet of the replaceable roll box straightening machine is enabled to be greater than the tension T2 of the inlet of the replaceable roll box straightening machine than the tension T1 of the inlet of the temper mill, the problem of tension attenuation caused by deformation of strip steel at the working rolls of each straightening machine in the multi-roll straightening process is solved, and the tension of the outlet of the temper mill is prevented from being greater than the tension of the inlet of the temper mill.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A multi-mode hot rolling temper mill, comprising:
the uncoiler is used for uncoiling the steel coil to obtain strip steel;
the inlet steering roller is used for steering the strip steel and ensuring that the running direction of the inlet strip steel and a rolling line are stable;
the straight head machine is used for straightening the head and the tail of the strip steel after the inlet is turned;
the flattening machine is used for flattening the strip steel after the head and the tail are straightened;
the roller box replaceable straightening machine is used for straightening the leveled strip steel;
the outlet steering roll is used for steering the strip steel after being pulled and straightened and ensuring the running direction of the strip steel at the outlet of the straightener with the replaceable roll box and the stability of a rolling line;
and the coiling machine is used for coiling the strip steel after the outlet is turned.
2. The multi-mode hot rolling leveler of claim 1, wherein:
the straightener with the replaceable roller box comprises a first roller box and a second roller box;
the first roller box and the second roller box are both four-layer type straightening machines;
the first roller box comprises a first upper roller box and a first lower roller box, the first upper roller box comprises a first upper roller box frame, a first upper supporting roller and a first upper working roller, and the first lower roller box comprises a first lower roller box frame, a first lower supporting roller and a first lower working roller;
the second roller box comprises a second upper roller box and a second lower roller box, the second upper roller box comprises a second upper roller box frame, a second upper supporting roller and a second upper working roller, and the second lower roller box comprises a second lower roller box frame, a second lower supporting roller and a second lower working roller.
3. The multi-mode hot rolling leveler of claim 1, wherein:
the first upper working roll and the first lower working roll are small-diameter working rolls, the roll diameter is 40-60 mm, the number of the first upper working rolls is 9, the number of the first lower working rolls is 9, and the first roll box is used for producing thin-specification strip steel.
4. The multi-mode hot rolling leveler of claim 1, wherein:
the second upper working roll and the second lower working roll are large-diameter working rolls, the roll diameter is 80-100 mm, the number of the second upper working rolls is 6, the number of the second lower working rolls is 6, and the second roll box is used for producing thick-specification strip steel.
5. The multi-mode hot rolling leveler of claim 1, wherein:
the coiling machine is a high-tension coiling machine, the outlet tension T3 of the straightener with the replaceable roller box is ensured to be stable, and the outlet tension T3 of the straightener with the replaceable roller box, the inlet tension T2 of the straightener with the replaceable roller box and the inlet tension T1 of the leveler are ensured;
maximum tension T3 at outlet of straightenermaxAnd the maximum tension T1 of the inlet of the temper millmaxThe condition of formula (1) is satisfied:
in the formula: t3max-maximum coiling tension of the coiler, t;
T1max-maximum unwinding tension, t, of the unwinder;
σmaxthe yield strength of the highest-strength strip steel producible by the production line is MPa;
b, the width of the highest-strength strip steel which can be produced by a production line is mm;
h is the thickness of the highest-strength strip steel which can be produced by a production line, mm;
lambda is correction coefficient, and the value range is [0.1, 0.5 ].
6. A method of controlling a multi-mode hot rolling temper mill, comprising:
the multi-mode hot rolling temper mill according to any one of claims 2 to 5 has the following five production modes according to the production requirements of products with different specifications:
a rewinding production mode for inspecting strip steel quality or cutting off defects;
an individual leveling production mode for producing a product having a thickness specification of 3.5mm or more;
a production mode of a flattening and small-diameter straightening machine, wherein the production mode of the flattening and small-diameter straightening machine is used for producing high-strength steel products with the thickness specification of below 2.0 mm;
a production mode of a flattening and large-diameter straightening machine, wherein the production mode of the flattening and large-diameter straightening machine is used for producing high-strength steel products with the thickness specification of 2.0-3.5 mm;
and the production mode of the single straightener is used for producing the high-performance soft steel with the thickness specification of below 3.5 mm.
7. The control method of the multi-mode hot rolling temper mill according to claim 6, wherein:
in the rewinding production mode, the temper mill and the roller box replaceable straightener are both in an open state;
and in the independent leveling production mode, the roller box replaceable straightening machine is in an open state, and the leveling machine is produced at the speed of 600m/min at most.
8. The control method of the multi-mode hot rolling temper mill according to claim 6, wherein:
under leveling and minor diameter straightener production mode, interchangeable roller box straightener adopts first roller box draws through temper rolling and high tension and corrects, realizes the wave shape control of belted steel, and through the adjustment of interchangeable roller box straightener entry and export decrement, realizes the control to the high-strength steel warpage, the leveler with first roller box adopts the production of maximum 200 m/min.
9. The control method of the multi-mode hot rolling temper mill according to claim 6, wherein:
under leveling and major diameter straightener production mode, interchangeable roller box straightener adopts the second roller box draws through temper rolling and high tension and corrects, realizes the wave shape control of belted steel to through the adjustment of straightener entry and export decrement, realize the control to the high-strength steel warpage, the leveler with the second roller box adopts the speed production of maximum 300 m/min.
10. The control method of the multi-mode hot rolling temper mill according to claim 6, wherein:
under the production mode of the single straightening machine, the flattening machine is in an open state, when the thickness of the strip steel is below 2.0mm, the first roller box is adopted by the straightening machine with the replaceable roller box, and the first roller box is produced at the speed of 200m/min at most; when the thickness of the strip steel is 2.0 mm-3.5 mm, the straightener with the replaceable roller box adopts a second roller box, and the second roller box is produced at the speed of 300m/min at most.
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