CN118080566A - Reconstruction method of strip continuous casting and rolling production line - Google Patents
Reconstruction method of strip continuous casting and rolling production line Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 258
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000009749 continuous casting Methods 0.000 title claims abstract description 46
- 230000006698 induction Effects 0.000 claims abstract description 22
- 230000033228 biological regulation Effects 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 26
- 238000010008 shearing Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 10
- 238000004381 surface treatment Methods 0.000 claims description 10
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- 229910052742 iron Inorganic materials 0.000 claims description 8
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- 238000005516 engineering process Methods 0.000 abstract description 6
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- 238000009851 ferrous metallurgy Methods 0.000 abstract description 4
- 230000001737 promoting effect Effects 0.000 abstract description 3
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- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
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- 239000002994 raw material Substances 0.000 description 4
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- 230000000694 effects Effects 0.000 description 3
- 239000002609 medium Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a reconstruction method of a strip continuous casting and rolling production line, which relates to the technical field of ferrous metallurgy, and the invention is based on the existing headless continuous casting and rolling production line, integrates an online roll changing and grinding roller coordination mechanism, and realizes the online grinding of variable-thickness strips produced by online roll changing without stopping a finishing mill group and worn rollers; by introducing an edge heater before rough rolling and introducing a transverse magnetic induction heater before finish rolling, the uniformity of the temperature distribution of the strip in the rolling process is improved, the surface quality of the strip in the endless continuous casting and rolling process is optimized, the flexible coordination and controllability of the working procedures are improved, the flexible regulation capability of strip production is improved, the thickness coverage range of the product is widened, the flexible adaptation degree between equipment, technology and the product is improved, the continuity and stability of production are ensured, and the invention has important significance in the aspects of promoting the quality improvement and efficiency of a production line, realizing consumption reduction, energy conservation and optimizing the configuration of the production line.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a reconstruction method of a strip continuous casting and rolling production line.
Background
The continuous rolling equipment is a basis for guaranteeing the operation of a process, the process is a way for controlling the quality of the product, the endless continuous casting continuous rolling (ESP) technology has the advantages of short process, short production period, energy conservation, high yield and the like, can stably produce thin-specification proportional strips in batches, can cover cold-rolled products of the same specification in a large scale, realizes the replacement of cold rolling by hot rolling, replaces traditional thicker-specification products by high-added-value thin-specification hot-rolled strips, and represents the highest level of the hot-rolled strip steel technology in the world today. The hot continuous rolling system of the plate and the strip belongs to a nonlinear, time-varying and strong-coupling complex system, and needs to have high adaptability among equipment, processes and products, and the final aim is to realize short process and high automation. In the process of realizing short flow, the equipment is easy to have the problem of excessively rigid connection, so that the flexibility adaptation degree among the equipment, the process and the product is insufficient, and the flexibility regulation and control capability is lacking.
The ESP product mainly comprises a thin-specification plate strip, and the following four problems mainly exist in the production process, namely, in the rolling process, the roller abrasion of a finishing mill group is serious, the surface quality of the plate strip is directly affected, frequent roller replacement is needed, the replacement period of an ESP finishing mill working roller is about 8 hours, and in the period of stopping and replacing the roller of a downstream finishing mill group, the upstream continuous casting process cannot be continuously carried out, so that the production is forced to stop or an intermediate plate strip is produced, and the production continuity and efficiency are seriously affected; secondly, in the prior art, the induction heating mode is easy to cause uneven distribution of the temperature of the plate strip before finish rolling, and the ratio of the temperature distribution edges of the plate strip is larger, so that the tissue performance of the product is affected; thirdly, the existing production line carries out offline grinding on the rolls after being replaced by the offline grinding machine in an independent grinding roll workshop, the service and the coping of the rolls belong to different workshops or working areas, the production efficiency of the production line is reduced in the offline coping process, and the carbon emission is increased.
The patent application with the publication number of CN117619889A proposes a flexible production line and a production process of endless rolled strip steel; the patent with the authorized bulletin number of CN217616818U proposes a continuous casting and rolling endless rolling production line; the two prior arts disclose a flexible production line and a production process of endless rolled strip steel with limited flexibility and adaptability of the rolling process, but the utilization rate and the production continuity of the production line are not improved; aiming at the latest hot spot and common problems in the short process of the hot continuous rolling of the plate strip, developing a headless continuous casting and rolling production process which has the important significance of optimizing the process flow, accelerating the production rhythm, realizing continuous production and improving the production efficiency.
Disclosure of Invention
In order to solve the technical problems, the invention provides a reconstruction method of a strip continuous casting and rolling production line, which is characterized in that the existing rolling process is subjected to flow reconstruction, an edge heater is arranged before a rough rolling process, a transverse magnetic induction heater is arranged before a finish rolling process, the uniformity of temperature distribution of the edge and the middle of the strip is optimized, the surface quality of the strip is improved, edge cracking is avoided, a stand is additionally arranged at the tail end of a five stand of a finishing mill unit of the original production line to serve as a standby rolling mill, the five stand is changed into a six stand, the finishing mill unit is provided with a dynamic variable schedule rolling strategy under a transient abrupt change state, the finishing mill unit is simultaneously lifted by a worn finishing mill roller and pressed by the standby finishing mill roller under a working state, the length of a thickened region caused by rolling variable schedule is shortened, an online grinding roller device is arranged on the finishing mill unit, and the working roller is subjected to online grinding at a rolling gap, so that continuous production of the finishing mill unit is realized.
The technical scheme of the invention is as follows:
The reconstruction method of the strip continuous casting and rolling production line comprises the following process flows: continuous casting, edge heating, first descaling, rough rolling, shearing, induction heating, second descaling, finish rolling, laminar cooling, flying shearing and coiling, and the method comprises the following steps of:
s1, continuously casting a plate and strip by using a near-net-shape continuous casting method in a plate and strip continuous casting machine;
S2, arranging an edge heater with a C-shaped structure before rough rolling, increasing the temperature of the edge of the plate strip by 80-120 ℃, and reducing the temperature difference of the cross section of the plate strip;
s3, performing primary surface treatment on the rough rolling front plate strip by using a first descaling box, wherein the first descaling box adopts a design of small water quantity and high pressure, and sprays high-pressure water to the plate strip to remove surface oxide scales on the plate strip after edge heating, so that the surface quality of an intermediate blank is improved;
S4, rough rolling is carried out on the plate and strip under high pressure by using a rough rolling unit, wherein the rough rolling unit is arranged by adopting three frames, and a rolling mill of the rough rolling unit is a four-roller rolling mill;
s5, in the endless rolling mode, when a downstream unit fails and needs to shear the plate strip, shearing the plate strip after rough rolling by using pendulum shears, and switching the production mode from a production thin plate mode to a production medium plate mode;
S6, uniformly heating the plate strip by using a transverse magnetic induction heater;
S7, adopting a design of small water quantity and large pressure for the second descaling box, spraying high-pressure water to the strip, carrying out surface treatment on the strip for the second time, removing surface iron scales on the strip after induction heating, and improving the surface quality of the strip entering a finishing mill group;
s8, finishing rolling the plate and strip by using a finishing mill group with an online roll changing and grinding roll, wherein the finishing mill group has a dynamic change schedule rolling and online grinding roll strategy in a transient mutation state;
S9, cooling the plate strip by using laminar cooling equipment;
S10, shearing and coiling a plate strip with the thickness of 0.8-5mm by using flying shear equipment in a headless rolling production mode, wherein pinch rolls are arranged in front of and behind the flying shear equipment;
S11, coiling the plate belt by using three underground coiling machines.
Further, the power of the edge heater is set to be 200-400KW, and the depth of the covered edge is 50-95mm.
Further, the pressure of the first descaling box and the pressure of the second descaling box are respectively set to 300-400bar.
Further, a stand is added at the tail end of the five stands of the finishing mill group of the original production line to serve as a standby rolling mill, and the arrangement is changed from five stands to six stands; the standby rolling mill is not put into use when the headless continuous casting and rolling production line is in normal production, the roll gap is in an open state, and the standby frame is continuously changed along with the production; when a certain rolling mill roll in the five-stand rolling mill put into production is seriously worn and needs to be replaced, the rolling process is withdrawn from the rolling mill with serious roll wear, and the standby rolling mill is put into the rolling process, so that the production line still keeps five-stand rolling, meanwhile, the stand of the finishing mill group which is newly formed needs to dynamically adjust multiple parameters of roll gap, speed, tension and rolling force, the length of a wedge-shaped zone during variable schedule rolling is shortened, and the end stand of the finishing mill group realizes fixed-length variable-thickness rolling through roll gap adjustment; the rolling mill withdrawing from the rolling process becomes a new stand-by rolling mill after the roll replacement is completed, and waits for replacement of the rolling mill with the next heavy roll wear.
Further, a cross beam is respectively arranged above an upper working roller and below a lower working roller of each rolling mill of the finishing mill group, an online grinding roller device is arranged on the cross beam, the online grinding roller device is driven by a waterproof linear motor to reciprocate on the cross beam, so that the online grinding roller device moves along the axial direction of a roller, the roller grinding is realized by a pair of grinding wheels arranged on the online grinding roller device, each grinding wheel is provided with a cup-shaped grinding stone, the grinding wheel is independently driven by a hydraulic motor to rotate along the axial direction of the grinding head, and the grinding wheels are pressed towards a roller body by a hydraulic cylinder to realize grinding; the pressing force between the grinding head and the roller is regulated by a hydraulic cylinder; and each beam of the online grinding roller device is provided with a detection element, the position and the roller surface morphology of the grinding head are detected by the detection element, the online grinding of the roller shape of the roller is realized in a rolling gap, the surface quality and the plate shape regulation capability of the plate strip are improved, and the rolling mileage is prolonged.
Further, the laminar cooling equipment is provided with 34 groups of upper and lower headers, 1-12 groups are coarse tuning sections, 13-30 groups are fine tuning sections and 31-34 groups are fine tuning sections.
Compared with the prior art, the invention has the following advantages:
(1) The finishing mill group is arranged on the basis of five frames of an ESP production line, a stand-by rolling mill is additionally arranged, transient abrupt change dynamic schedule rolling is realized, the finishing mill group is lifted by the roller of the abrasion finishing mill and is pressed down by the roller of the stand-by finishing mill in a working state, the length of a thickening area caused by the schedule rolling is shortened, a fixed-length variable-thickness plate strip is produced, the thickness coverage of a product is widened, a flexible rolling production mode is provided, the problem of whole line production stopping caused by roller replacement is avoided, and the production efficiency of the headless continuous casting continuous rolling production line is improved.
(2) The finishing mill group is configured with the online grinding roller device, realizes online grinding of roller shapes at rolling gaps, improves the surface quality and plate shape regulation capability of plate strips, replaces the offline grinding roller procedure of the traditional ESP production line, optimizes the production line layout, reduces the production energy consumption, lightens the turnover and sensing measurement working hour period in a roller offline grinding field, prolongs the service life of working rollers, and has important significance for improving the product quality, the production capability and the short flow level of the hot rolling production line.
(3) The invention is additionally provided with the edge heater and the transverse magnetic induction heating, the edge heater increases the temperature of the edge of the plate strip, prevents the occurrence of the edge crack defect of the subsequent rolling caused by the excessively low temperature plasticity of the edge of the intermediate blank, and provides good intermediate blank raw materials for finish rolling; the transverse and longitudinal magnetic induction heating solves the defect of uneven temperature of the plate strip in the thickness direction and the width direction, ensures that the plate strip is even in the thickness direction and the width direction before entering a finishing mill group, and optimizes the surface quality of the endless continuous casting and rolling plate strip.
(4) The invention can meet the high-quality development requirement of ferrous metallurgy, and has important significance in the aspects of promoting transformation and upgrading in the field of ferrous metallurgy short-process rolling, optimizing production line layout, promoting green development and the like.
Drawings
FIG. 1 is a schematic diagram of a process flow of reconstruction production of a continuous casting and rolling line without a head;
fig. 2 is a schematic diagram of the layout of the reconstruction production equipment of the continuous casting and rolling line without head.
Reference numerals: 1-a strip caster; 2-edge heater; 3-a first descaling box; 4-roughing mill sets; 5-pendulum shears; 6-a transverse magnetic induction heater; 7-a second descaling box; 8-finishing mill groups; 9-laminar cooling equipment; 10-flying shear equipment; 11-coiler.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in fig. 1-2, a strip produced by a strip continuous casting machine 1 passes through an edge heater 2 to raise the temperature of the edge of the strip, then enters a first descaling box 3, is subjected to rough rolling under high pressure by a rough rolling unit 4, and is sheared by a pendulum shear 5 when a downstream unit breaks down and needs to be sheared, enters a transverse magnetic induction heater 6 to heat, passes through a second descaling box 7 to remove the surface scale of the strip, then enters a finishing rolling unit 8 provided with an online roll changing and grinding roll to finish rolling, is cooled by a laminar cooling device 9, is sheared and coiled by a flying shear device 10, and then enters a coiling machine 11 to carry out coiling.
Example 1: specifically, the invention provides a reconstruction method of a strip continuous casting and rolling production line, which comprises the following process flows: continuous casting, edge heating, first descaling, rough rolling, shearing, induction heating, second descaling, finish rolling, laminar cooling, flying shearing and coiling; the method comprises the following steps:
S1, continuously casting a plate and strip in a plate and strip continuous casting machine 1 by using a near net shape continuous casting method, wherein the temperature of the plate and strip after continuous casting treatment is 1450 ℃;
S2, arranging an edge heater 2 with a C-shaped structure before a rough rolling process, increasing the temperature of the edge of the plate strip by 100 ℃, compensating larger heat loss of the edge of the plate strip, increasing the edge extension of the rough rolling stage, reducing the local high point of the edge of the intermediate blank, providing good intermediate blank raw materials for finish rolling, and preventing the intermediate blank from causing edge cracking defect in the subsequent rolling due to the excessively low plastic drop of the edge temperature;
S3, performing primary surface treatment on the rough rolling front plate strip by using a first descaling box 3, spraying high-pressure water to the plate strip by using the first descaling box 3, setting the pressure of the first descaling box 3 to 300-350bar, removing oxidized iron scales on the surface of the plate strip after an edge heating process, and increasing the surface quality of an intermediate blank;
S4, rough rolling is carried out on the plate strip under the high pressure by using a rough rolling unit 4, the rough rolling unit 4 is arranged by adopting three frames, a rolling mill of the rough rolling unit 4 is a four-high rolling mill, and the temperature of the plate strip is reduced to 980+/-20 ℃ after the rough rolling unit 4 rough rolls under the high pressure;
s5, in the endless rolling mode, when the downstream unit fails and strip steel needs to be sheared, shearing the rough rolled strip steel by using the pendulum shear 5, and switching the production mode from a thin plate production mode to a medium plate production mode;
s6, carrying out induction heating on the plate strip, and raising the temperature to 1060+/-20 ℃, so as to raise the temperature of the plate strip entering the inlet of the finishing mill group 8 and ensure that the plate strip reaches the target outlet temperature in the rolling process of the finishing mill group 8; uniformly heating the plate strip by adopting a transverse magnetic induction heater 6, and eliminating the influences of uneven temperature in the longitudinal magnetic thickness direction and the transverse magnetic corner effect;
S7, carrying out surface treatment on the strip by using a second descaling box 7 before a finish rolling process, wherein the pressure of the second descaling box 7 is set to 300-350bar so as to remove oxidized iron scales on the surface of the strip and improve the surface quality of the strip entering a finishing mill group 8;
s8, finishing rolling is carried out on the plate and strip by using a finishing mill group 8 with online roll changing and grinding rolls, wherein the finishing mill group 8 is provided with a dynamic schedule changing rolling and online grinding roll strategy under a transient abrupt change state, namely, during normal rolling production, a stand is added at the tail end of five stands of the finishing mill group 8 of the original production line to serve as a stand-by rolling mill, and the arrangement is changed from five stands to six stands. When the ESP production line is in normal production, the standby rolling mill is not put into production, the roll gap of the standby rolling mill is in an open state, and the standby rolling mill is continuously changed along with the production. When any one of the five-stand rolling mill put into production is severely worn and needs to change the roll, the worn rolling mill roll is lifted, the rolling process is withdrawn, and the standby rolling mill is put into the rolling process, so that the production line still keeps five-stand rolling, meanwhile, the newly-formed finishing mill group 8 needs to dynamically adjust the multiple parameters of the roll gap, speed, tension and rolling force of each stand, the length of a wedge-shaped area during the variable schedule rolling is shortened, and the end stand of the finishing mill group 8 realizes fixed-length variable-thickness rolling through the roll gap adjusting technology. The rolling mill withdrawing from the rolling process becomes a new stand-by rolling mill after the roll replacement is completed, waiting for replacement of the next roll to wear the rolling mill. The online grinding roller strategy is that a cross beam is respectively arranged above an upper working roller and below a lower working roller of each rolling mill of the finishing mill group 8, the online grinding roller device is arranged on the cross beam and is driven by a waterproof linear motor to reciprocate on the cross beam so as to realize that the online grinding roller device moves along the axis direction of a roller, the roller grinding is realized by a pair of grinding wheels arranged on the online grinding roller device, each grinding wheel is provided with a cup-shaped grinding stone, the rotation of the grinding wheel is independently driven by a hydraulic motor, the grinding wheel rotates along the axis of the grinding head, and the grinding wheel is pressed towards the roller body by a hydraulic cylinder so as to realize grinding. The pressing force between the grinding head and the roller is regulated by a hydraulic cylinder. And each beam is provided with a detection element for detecting the position of the grinding head and the shape of the roller surface, and the roller shape of the roller is polished on line in a rolling gap so as to improve the surface quality and the plate shape regulating capability of the plate strip and prolong the rolling mileage. The outlet temperature of the plate belt passing through the finishing mill group 8 is 860+/-20 ℃;
S9, the laminar cooling equipment 9 is provided with 34 groups of upper and lower headers, 1-12 groups are coarse adjustment sections, 13-30 groups are fine adjustment sections and 31-34 groups are fine adjustment sections; cooling the plate strip by a laminar cooling device 9 to 630+/-20 ℃;
s10, shearing and coiling a plate strip with the thickness of 0.8-5mm in a headless rolling production mode, and arranging pinch rolls in front and back of the flying shear device 10 to ensure the stability of the plate strip in the shearing process;
S11, coiling the plate belt by using three underground coiling machines 11, so as to ensure the continuity of production.
The process can improve the active regulation capability and flexible rolling level of transient mutation of the plate strip in the hot continuous rolling production process, improve the product quality of endless rolled plate strip, promote transformation and upgrading in the field of short-process rolling, and release the process potential of hot continuous rolling equipment of the plate strip.
Example 2: specifically, the invention provides a reconstruction method of a strip continuous casting and rolling production line, which comprises the following process flows: continuous casting, edge heating, first descaling, rough rolling, shearing, induction heating, second descaling, finish rolling, laminar cooling, flying shearing and coiling; the method comprises the following steps:
S1, continuously casting a plate and strip in a plate and strip continuous casting machine 1 by using a near net shape continuous casting method, wherein the temperature of the plate and strip after continuous casting treatment is 1430 ℃;
S2, arranging an edge heater 2 with a C-shaped structure before a rough rolling process, increasing the temperature of the edge of the plate strip by 110 ℃, compensating larger heat loss of the edge of the plate strip, increasing the edge extension of the rough rolling stage, reducing the local high point of the edge of the intermediate blank, providing good intermediate blank raw materials for finish rolling, and preventing the intermediate blank from causing edge cracking defect in the subsequent rolling due to the excessively low plastic drop of the edge temperature;
S3, performing primary surface treatment on the rough rolling front plate strip by using a first descaling box 3, spraying high-pressure water to the plate strip by using the first descaling box 3, setting the pressure of the first descaling box 3 to be 320-350bar, removing oxidized iron scales on the surface of the plate strip after an edge heating process, and increasing the surface quality of an intermediate blank;
S4, rough rolling is carried out on the plate strip under the large pressure by using a rough rolling unit 4, the rough rolling unit 4 is arranged by adopting three frames, a rolling mill of the rough rolling unit 4 is a four-high rolling mill, and the temperature of the plate strip is reduced to 960+/-20 ℃ after the rough rolling unit 4 rough rolls under the large pressure;
s5, in the endless rolling mode, when the downstream unit fails and strip steel needs to be sheared, shearing the rough rolled strip steel by using the pendulum shear 5, and switching the production mode from a thin plate production mode to a medium plate production mode;
S6, carrying out induction heating on the plate strip, and raising the temperature to 1040+/-20 ℃, so as to raise the temperature of the plate strip entering the inlet of the finishing mill group 8 and ensure that the plate strip reaches the target outlet temperature in the rolling process of the finishing mill group 8; uniformly heating the plate strip by adopting a transverse magnetic induction heater 6, and eliminating the influences of uneven temperature in the longitudinal magnetic thickness direction and the transverse magnetic corner effect;
S7, carrying out surface treatment on the strip by using a second descaling box 7 before a finish rolling process, wherein the pressure of the second descaling box 7 is set to 320-350bar so as to remove oxidized iron scales on the surface of the strip and improve the surface quality of the strip entering a finishing mill group 8;
S8, finishing rolling is carried out on the plate and strip by using a finishing mill group 8 with online roll changing and grinding rolls, wherein the finishing mill group 8 is provided with a dynamic schedule changing rolling and online grinding roll strategy under a transient abrupt change state, namely, during normal rolling production, a stand is added at the tail end of five stands of the finishing mill group 8 of the original production line to serve as a stand-by rolling mill, and the arrangement is changed from five stands to six stands. When the ESP production line is in normal production, the standby rolling mill is not put into production, the roll gap of the standby rolling mill is in an open state, and the standby rolling mill is continuously changed along with the production. When any one of the five-stand rolling mill put into production is severely worn and needs to change the roll, the worn rolling mill roll is lifted, the rolling process is withdrawn, and the standby rolling mill is put into the rolling process, so that the production line still keeps five-stand rolling, meanwhile, the newly-formed finishing mill group 8 needs to dynamically adjust the multiple parameters of the roll gap, speed, tension and rolling force of each stand, the length of a wedge-shaped area during the variable schedule rolling is shortened, and the end stand of the finishing mill group 8 realizes fixed-length variable-thickness rolling through the roll gap adjusting technology. The rolling mill withdrawing from the rolling process becomes a new stand-by rolling mill after the roll replacement is completed, waiting for replacement of the next roll to wear the rolling mill. The online grinding roller strategy is that a cross beam is respectively arranged above an upper working roller and below a lower working roller of each rolling mill of the finishing mill group 8, the online grinding roller device is arranged on the cross beam and is driven by a waterproof linear motor to reciprocate on the cross beam so as to realize that the online grinding roller device moves along the axis direction of a roller, the roller grinding is realized by a pair of grinding wheels arranged on the online grinding roller device, each grinding wheel is provided with a cup-shaped grinding stone, the rotation of the grinding wheel is independently driven by a hydraulic motor, the grinding wheel rotates along the axis of the grinding head, and the grinding wheel is pressed towards the roller body by a hydraulic cylinder so as to realize grinding. The pressing force between the grinding head and the roller is regulated by a hydraulic cylinder. And each beam is provided with a detection element for detecting the position of the grinding head and the shape of the roller surface, and the roller shape of the roller is polished on line in a rolling gap so as to improve the surface quality and the plate shape regulating capability of the plate strip and prolong the rolling mileage. The outlet temperature of the plate belt passing through the finishing mill group 8 is 840+/-20 ℃;
S9, the laminar cooling equipment 9 is provided with 34 groups of upper and lower headers, 1-12 groups are coarse adjustment sections, 13-30 groups are fine adjustment sections and 31-34 groups are fine adjustment sections; cooling the plate strip by using laminar cooling equipment 9, wherein the temperature is reduced to 610+/-20 ℃;
s10, shearing and coiling a plate strip with the thickness of 0.8-5mm in a headless rolling production mode, and arranging pinch rolls in front and back of the flying shear device 10 to ensure the stability of the plate strip in the shearing process;
S11, coiling the plate belt by using three underground coiling machines 11, so as to ensure the continuity of production.
The process can improve the active regulation capability and flexible rolling level of transient mutation of the plate strip in the hot continuous rolling production process, improve the product quality of endless rolled plate strip, promote transformation and upgrading in the field of short-process rolling, and release the process potential of hot continuous rolling equipment of the plate strip.
Example 3: specifically, the invention provides a reconstruction method of a strip continuous casting and rolling production line, which comprises the following process flows: continuous casting, edge heating, first descaling, rough rolling, shearing, induction heating, second descaling, finish rolling, laminar cooling, flying shearing and coiling; the method comprises the following steps:
s1, continuously casting a plate and strip in a plate and strip continuous casting machine 1 by using a near net shape continuous casting method, wherein the temperature of the plate and strip after continuous casting treatment is 1410 ℃;
s2, arranging an edge heater 2 with a C-shaped structure before a rough rolling process, increasing the temperature of the edge of the plate strip by 90 ℃, compensating larger heat loss of the edge of the plate strip, increasing the edge extension of the rough rolling stage, reducing the local high point of the edge of the intermediate blank, providing good intermediate blank raw materials for finish rolling, and preventing the intermediate blank from causing edge cracking defect in the subsequent rolling due to the excessively low plastic drop of the edge temperature;
S3, performing primary surface treatment on the rough rolling front plate strip by using a first descaling box 3, spraying high-pressure water to the plate strip by using the first descaling box 3, setting the pressure of the first descaling box 3 to 300-350bar, removing oxidized iron scales on the surface of the plate strip after an edge heating process, and increasing the surface quality of an intermediate blank;
S4, rough rolling is carried out on the plate strip under the high pressure by using a rough rolling unit 4, the rough rolling unit 4 is arranged by adopting three frames, a rolling mill of the rough rolling unit 4 is a four-high rolling mill, and the temperature of the plate strip is reduced to 920+/-20 ℃ after the rough rolling unit 4 rough rolls under the high pressure;
s5, in the endless rolling mode, when the downstream unit fails and strip steel needs to be sheared, shearing the rough rolled strip steel by using the pendulum shear 5, and switching the production mode from a thin plate production mode to a medium plate production mode;
s6, carrying out induction heating on the plate strip, and raising the temperature to 1020+/-20 ℃, so as to raise the temperature of the plate strip entering the inlet of the finishing mill group 8 and ensure that the plate strip reaches the target outlet temperature in the rolling process of the finishing mill group 8; uniformly heating the plate strip by adopting a transverse magnetic induction heater 6, and eliminating the influences of uneven temperature in the longitudinal magnetic thickness direction and the transverse magnetic corner effect;
S7, carrying out surface treatment on the strip by using a second descaling box 7 before a finish rolling process, wherein the pressure of the second descaling box 7 is set to 300-350bar so as to remove oxidized iron scales on the surface of the strip and improve the surface quality of the strip entering a finishing mill group 8;
S8, finishing rolling is carried out on the plate and strip by using a finishing mill group 8 with online roll changing and grinding rolls, wherein the finishing mill group 8 is provided with a dynamic schedule changing rolling and online grinding roll strategy under a transient abrupt change state, namely, during normal rolling production, a stand is added at the tail end of five stands of the finishing mill group 8 of the original production line to serve as a stand-by rolling mill, and the arrangement is changed from five stands to six stands. When the ESP production line is in normal production, the standby rolling mill is not put into production, the roll gap of the standby rolling mill is in an open state, and the standby rolling mill is continuously changed along with the production. When any one of the five-stand rolling mill put into production is severely worn and needs to change the roll, the worn rolling mill roll is lifted, the rolling process is withdrawn, and the standby rolling mill is put into the rolling process, so that the production line still keeps five-stand rolling, meanwhile, the newly-formed finishing mill group 8 needs to dynamically adjust the multiple parameters of the roll gap, speed, tension and rolling force of each stand, the length of a wedge-shaped area during the variable schedule rolling is shortened, and the end stand of the finishing mill group 8 realizes fixed-length variable-thickness rolling through the roll gap adjusting technology. The rolling mill withdrawing from the rolling process becomes a new stand-by rolling mill after the roll replacement is completed, waiting for replacement of the next roll to wear the rolling mill. The online grinding roller strategy is that a cross beam is respectively arranged above an upper working roller and below a lower working roller of each rolling mill of the finishing mill group 8, the online grinding roller device is arranged on the cross beam and is driven by a waterproof linear motor to reciprocate on the cross beam so as to realize that the online grinding roller device moves along the axis direction of a roller, the roller grinding is realized by a pair of grinding wheels arranged on the online grinding roller device, each grinding wheel is provided with a cup-shaped grinding stone, the rotation of the grinding wheel is independently driven by a hydraulic motor, the grinding wheel rotates along the axis of the grinding head, and the grinding wheel is pressed towards the roller body by a hydraulic cylinder so as to realize grinding. The pressing force between the grinding head and the roller is regulated by a hydraulic cylinder. And each beam is provided with a detection element for detecting the position of the grinding head and the shape of the roller surface, and the roller shape of the roller is polished on line in a rolling gap so as to improve the surface quality and the plate shape regulating capability of the plate strip and prolong the rolling mileage. The outlet temperature of the plate belt passing through the finishing mill group 8 is 820+/-20 ℃;
S9, the laminar cooling equipment 9 is provided with 34 groups of upper and lower headers, 1-12 groups are coarse adjustment sections, 13-30 groups are fine adjustment sections and 31-34 groups are fine adjustment sections; cooling the plate strip by using laminar cooling equipment 9, wherein the temperature is reduced to 610+/-20 ℃;
s10, shearing and coiling a plate strip with the thickness of 0.8-5mm in a headless rolling production mode, and arranging pinch rolls in front and back of the flying shear device 10 to ensure the stability of the plate strip in the shearing process;
S11, coiling the plate belt by using three underground coiling machines 11, so as to ensure the continuity of production.
The process can improve the active regulation capability and flexible rolling level of transient mutation of the plate strip in the hot continuous rolling production process, improve the product quality of endless rolled plate strip, promote transformation and upgrading in the field of short-process rolling, and release the process potential of hot continuous rolling equipment of the plate strip.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. The reconstruction method of the strip continuous casting and rolling production line is characterized by comprising the following process flows: continuous casting, edge heating, first descaling, rough rolling, shearing, induction heating, second descaling, finish rolling, laminar cooling, flying shearing and coiling, and the method comprises the following steps of:
s1, continuously casting a plate and strip by using a near-net-shape continuous casting method in a plate and strip continuous casting machine;
S2, arranging an edge heater with a C-shaped structure before rough rolling, increasing the temperature of the edge of the plate strip by 80-120 ℃, and reducing the temperature difference of the cross section of the plate strip;
s3, performing primary surface treatment on the rough rolling front plate strip by using a first descaling box, wherein the first descaling box adopts a design of small water quantity and high pressure, and sprays high-pressure water to the plate strip to remove surface oxide scales on the plate strip after edge heating, so that the surface quality of an intermediate blank is improved;
S4, rough rolling is carried out on the plate and strip under high pressure by using a rough rolling unit, wherein the rough rolling unit is arranged by adopting three frames, and a rolling mill of the rough rolling unit is a four-roller rolling mill;
s5, in the endless rolling mode, when a downstream unit fails and needs to shear the plate strip, shearing the plate strip after rough rolling by using pendulum shears, and switching the production mode from a production thin plate mode to a production medium plate mode;
S6, uniformly heating the plate strip by using a transverse magnetic induction heater;
S7, adopting a design of small water quantity and large pressure for the second descaling box, spraying high-pressure water to the strip, carrying out surface treatment on the strip for the second time, removing surface iron scales on the strip after induction heating, and improving the surface quality of the strip entering a finishing mill group;
s8, finishing rolling the plate and strip by using a finishing mill group with an online roll changing and grinding roll, wherein the finishing mill group has a dynamic change schedule rolling and online grinding roll strategy in a transient mutation state;
S9, cooling the plate strip by using laminar cooling equipment;
S10, shearing and coiling a plate strip with the thickness of 0.8-5mm by using flying shear equipment in a headless rolling production mode, wherein pinch rolls are arranged in front of and behind the flying shear equipment;
S11, coiling the plate belt by using three underground coiling machines.
2. The method for reconstructing the strip continuous casting and rolling line according to claim 1, wherein the method comprises the following steps: the power of the edge heater is set to be 200-400KW, and the depth of the covered edge is 50-95mm.
3. The method for reconstructing the strip continuous casting and rolling line according to claim 1, wherein the method comprises the following steps: the pressure of the first descaling box and the pressure of the second descaling box are respectively set to 300-400bar.
4. The method for reconstructing the strip continuous casting and rolling line according to claim 1, wherein the method comprises the following steps: a stand is added at the tail end of a five-stand of a finishing mill group of the original production line to serve as a standby rolling mill, and the arrangement is changed from five stands to six stands; the standby rolling mill is not put into use when the headless continuous casting and rolling production line is in normal production, the roll gap is in an open state, and the standby frame is continuously changed along with the production; when a certain rolling mill roll in the five-stand rolling mill put into production is seriously worn and needs to be replaced, the rolling process is withdrawn from the rolling mill with serious roll wear, and the standby rolling mill is put into the rolling process, so that the production line still keeps five-stand rolling, meanwhile, the stand of the finishing mill group which is newly formed needs to dynamically adjust multiple parameters of roll gap, speed, tension and rolling force, the length of a wedge-shaped zone during variable schedule rolling is shortened, and the end stand of the finishing mill group realizes fixed-length variable-thickness rolling through roll gap adjustment; the rolling mill withdrawing from the rolling process becomes a new stand-by rolling mill after the roll replacement is completed, and waits for replacement of the rolling mill with the next heavy roll wear.
5. The method for reconstructing the strip continuous casting and rolling line according to claim 1, wherein the method comprises the following steps: the method comprises the steps that a beam is respectively arranged above an upper working roll and below a lower working roll of each rolling mill of a finishing mill group, an online grinding roll device is arranged on the beam and driven by a waterproof linear motor to reciprocate on the beam, so that the online grinding roll device moves along the axis direction of a roller, roller grinding is realized by a pair of grinding wheels arranged on the online grinding roll device, each grinding wheel is provided with a cup-shaped grinding stone, the grinding wheels are independently driven by a hydraulic motor to rotate, and the grinding wheels rotate along the axis of the grinding head and are pressed towards a roller body by a hydraulic cylinder to realize grinding; the pressing force between the grinding head and the roller is regulated by a hydraulic cylinder; and each beam of the online grinding roller device is provided with a detection element, the position and the roller surface morphology of the grinding head are detected by the detection element, the online grinding of the roller shape of the roller is realized in a rolling gap, the surface quality and the plate shape regulation capability of the plate strip are improved, and the rolling mileage is prolonged.
6. The method for reconstructing the strip continuous casting and rolling line according to claim 1, wherein the method comprises the following steps: the laminar flow cooling equipment is provided with 34 groups of upper and lower headers, 1-12 groups are coarse tuning sections, 13-30 groups are fine tuning sections and 31-34 groups are fine tuning sections.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001205312A (en) * | 2000-01-18 | 2001-07-31 | Nippon Steel Corp | Method for on-line grinding roll in hot-rolling mill |
| CN1350891A (en) * | 2000-10-31 | 2002-05-29 | 株式会社日立制作所 | Online roller grinding apparatus and method, rolling apparatus and method thereof |
| CN113695403A (en) * | 2021-08-09 | 2021-11-26 | 燕山大学 | Endless rolling method based on temperature uniform control |
| CN116140359A (en) * | 2023-02-24 | 2023-05-23 | 福建鼎盛钢铁有限公司 | Method for eliminating double-sided wave shape of low-carbon Q235B of ESP production line |
| CN116695010A (en) * | 2023-06-09 | 2023-09-05 | 福建鼎盛钢铁有限公司 | Method for eliminating edge crack of high-carbon steel of ESP production line |
| CN117000763A (en) * | 2023-08-08 | 2023-11-07 | 中冶南方工程技术有限公司 | Flexible finishing mill group, continuous casting and rolling flexible production line and corresponding production method |
-
2024
- 2024-04-29 CN CN202410523996.8A patent/CN118080566A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001205312A (en) * | 2000-01-18 | 2001-07-31 | Nippon Steel Corp | Method for on-line grinding roll in hot-rolling mill |
| CN1350891A (en) * | 2000-10-31 | 2002-05-29 | 株式会社日立制作所 | Online roller grinding apparatus and method, rolling apparatus and method thereof |
| CN113695403A (en) * | 2021-08-09 | 2021-11-26 | 燕山大学 | Endless rolling method based on temperature uniform control |
| CN116140359A (en) * | 2023-02-24 | 2023-05-23 | 福建鼎盛钢铁有限公司 | Method for eliminating double-sided wave shape of low-carbon Q235B of ESP production line |
| CN116695010A (en) * | 2023-06-09 | 2023-09-05 | 福建鼎盛钢铁有限公司 | Method for eliminating edge crack of high-carbon steel of ESP production line |
| CN117000763A (en) * | 2023-08-08 | 2023-11-07 | 中冶南方工程技术有限公司 | Flexible finishing mill group, continuous casting and rolling flexible production line and corresponding production method |
Non-Patent Citations (1)
| Title |
|---|
| ***: "《热轧生产自动化技术》", 30 November 2006, 冶金工业出版社, pages: 18 - 19 * |
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