CN111774422A - Method for reducing stop loss of continuous rolling mill - Google Patents

Method for reducing stop loss of continuous rolling mill Download PDF

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Publication number
CN111774422A
CN111774422A CN202010683740.5A CN202010683740A CN111774422A CN 111774422 A CN111774422 A CN 111774422A CN 202010683740 A CN202010683740 A CN 202010683740A CN 111774422 A CN111774422 A CN 111774422A
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coil
determining
parking position
coils
parking
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CN202010683740.5A
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CN111774422B (en
Inventor
陈湘宁
陈甚超
宋浩源
于海龙
王斌
马凯
史风龙
胡佳新
王佳雨
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Beijing Shougang Cold Rolled Sheet Co Ltd
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Beijing Shougang Cold Rolled Sheet Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/72—Rear end control; Front end control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The application belongs to the technical field of cold-rolled strip steel production control, and particularly relates to a method for reducing the stop loss of a continuous rolling mill. The method comprises the following steps: determining that the connection condition of the front and rear coils of the parking welding line meets the requirement; determining a parking position according to the difference value of the engaging screw-down rates of the front steel coil and the rear steel coil; according to the selected parking position, determining tension adjustment between the racks behind the parking position, and carrying out vehicle starting operation by the adjusted tension; and determining a processing method for the front and rear coils after the start and the shearing of the continuous rolling unit according to the selected parking position, and processing the front and rear coils by the determined processing method for the front and rear coils. The method for reducing the stop loss of the continuous mill can reduce the thickness fluctuation part which needs to be cut off when the existing active stop requirement is required by optimizing the process, thereby achieving the purpose of reducing the cutting loss length by 10-15 m/time and improving the yield of the strip steel.

Description

Method for reducing stop loss of continuous rolling mill
Technical Field
The application belongs to the technical field of cold-rolled strip steel production control, and particularly relates to a method for reducing the stop loss of a continuous rolling mill.
Background
Because the market competition of the cold-rolled strip steel is increasingly intensified, the cost reduction and efficiency improvement measures are more important.
In the production process of the present continuous rolling unit, the continuous rolling unit is limited by the mileage of the roller, and the continuous rolling unit must be stopped when the roller needs to be changed due to quality problems or a series of equipment faults such as hydraulic oil leakage are treated by the continuous rolling unit. When the automobile is parked, the deformation area indentation is generated, the thickness fluctuation is generated when the automobile is lifted, the automobile is a waste product which is larger than 15% of the target thickness according to the current technical standard, and the automobile needs to be cut off between 5% and 15% of the target thickness.
The method aims at the conventional variety specifications produced by the existing acid rolling unit to study, and if the active position finding is selected for parking, the parking positions are selected before and after the welding line when the continuous rolling unit is stopped for operation. In normal start-up operation, there is fluctuation in the exit thickness of the strip steel between the stands S1 and S5, which is about 50 m. Basically, thickness fluctuation generated by indentation in a deformation area of the S1-S3 machine frame is between 5% and 15%, the thickness fluctuation needs to be cut off, and the generated cutting loss has great influence on the yield of the strip steel.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for reducing the stop loss of a continuous rolling mill, so as to solve the technical problem that the strip steel yield is greatly influenced due to the active stop of the continuous rolling mill in the prior art.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a method of reducing tandem mill stand-down losses, the method comprising:
determining that the connection condition of the front and rear coils of the parking welding line meets the requirement;
determining a parking position according to the difference value of the engaging screw-down rates of the front steel coil and the rear steel coil;
according to the selected parking position, determining tension adjustment between the racks behind the parking position, and carrying out vehicle starting operation by the adjusted tension;
and determining a processing method for the front and rear coils after the start and the shearing of the continuous rolling unit according to the selected parking position, and processing the front and rear coils by the determined processing method for the front and rear coils.
Further, confirm that the coil of strip links up the condition and meets the requirements before and after the parking welding seam, specifically include:
determining the thickness of the raw material to be 6.0-2.0mm, the width of the raw material to be 800-1860mm, the output thickness to be 2.6-0.2mm, and the difference between the output width and the width of the raw material to be 0-100 mm;
determining the yield strength connection between the front and the rear rolls to be 0-200MPa, the width connection difference to be 0-150mm and the thickness connection difference to be 0-0.5 mm.
Further, according to the difference value of the engaging and pressing rates of the front steel coil and the rear steel coil, the parking position is determined, and the method specifically comprises the following steps:
confirming that the difference value of the engaging rolling reduction rates of the front and the rear steel coils is within 0-15%;
if the rolling reduction of the latter coil of steel is lower than 70%, determining that the parking position is selected between the S2-S3 racks;
and if the rolling reduction rate of the latter coil is higher than or equal to 70%, determining that the parking position is selected between the S1-S2 racks.
Furthermore, the determining, according to the selected parking position, tension adjustment between the racks located behind the parking position, and performing a vehicle pickup operation with the adjusted tension specifically includes:
checking the parameter change of the front and the rear steel coils, determining whether the change of the tension set value of the front and the rear steel coils exceeds a set range, if so, performing a first operation, and if the change of the tension set value of the front and the rear steel coils belongs to the set range, performing a second operation;
the first operation includes:
if the parking position is selected between the S1-S2 frames, adjusting the tension between the adjacent frames behind the S1-S2 frames by increasing or decreasing 10-20% in the direction that the rolling parameters of the later coiled steel coil approach, and carrying out the start operation by the adjusted tension;
if the parking position is selected between the S2-S3 frames, according to the content of the inspection parameters, the tension between the adjacent frames behind the S2-S3 frames is adjusted by increasing or decreasing 10-20% in the direction that the rolling parameters of the next coil of steel are close to each other, and the start operation is carried out by the adjusted tension;
the second operation includes: and carrying out the start operation according to the original steel coil rolling parameters.
Further, the determining, according to the selected parking position, a method for processing front and rear coils after the start and the cutting of the continuous rolling mill train, and processing the front and rear coils by the determined method for processing the front and rear coils specifically include:
if the parking position is selected between the S1-S2 racks, 30m-40m of an outer ring of the lower coil is cut off at an offline inspection station, the remaining 5-10m of the thickness fluctuation part is reserved, and the coil is not required to be cut off in rolling;
if the parking position is between the racks S2-S3, the outer ring of the coil is cut off by 20-30m at an off-line inspection station for the lower coil, and the residual thickness fluctuation part of 5-10m is reserved, so that the coil is not required to be cut off in the process of rolling.
The invention has the beneficial effects that:
the method for reducing the stop loss of the continuous mill can reduce the thickness fluctuation part which needs to be cut off when the existing active stop requirement is required by optimizing the process, thereby achieving the purpose of reducing the cutting loss length by 10-15 m/time and improving the yield of the strip steel.
Drawings
FIG. 1 is a schematic flow chart of a method for reducing the shutdown loss of a continuous rolling mill according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an ejector of the jet pump of fig. 1.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
Fig. 1 is a schematic flow chart of a method for reducing the stop loss of a continuous rolling mill according to an embodiment of the present invention, and with reference to fig. 1, the flow chart method includes:
s1: confirm that the connection condition of rolling up around the parking welding seam meets the requirements, confirm promptly that the connection condition of rolling up around the parking welding seam meets normal production standard, the concrete requirement is:
the thickness of the raw material is 6.0-2.0mm, the width of the raw material is 800-1860mm, the output thickness is 2.6-0.2mm, the difference between the output width and the width of the raw material is 0-100mm, and the yield strength connection between the front roll and the rear roll is 0-200MPa, the width connection difference is 0-150mm, and the thickness connection difference is 0-0.5 mm.
This method is not applicable if the splicing of the front and back rolls is out of the normal splicing category.
S2: according to the difference value of the joint rolling reduction of the front and the rear steel coils, the parking position is determined, the judgment condition is that the factor of the rolling reduction is considered, the deformation length is different, and the position of thickness fluctuation is caused, and the method specifically comprises the following steps:
judgment condition 1: confirming that the difference value of the engaging screw-down rates of the front and the rear steel coils is within 0-15%, otherwise increasing the start-up difficulty, namely, more than 15% of parking positions are not selected between the racks;
judgment condition 2: after the judgment condition 1 is met, determining a parking position according to the reduction rate of the next coil of steel coil, if the reduction rate of the next coil of steel coil is lower than 70%, correspondingly reducing the number of meters of which the thickness fluctuation is left in the next coil due to the low reduction rate, and determining that the parking position is selected between S2-S3 racks; and if the rolling reduction rate of the latter coil is higher than or equal to 70%, determining that the parking position is selected between the S1-S2 racks.
S3: according to the selected parking position, determining tension adjustment between the racks behind the parking position, and carrying out vehicle lifting operation by the adjusted tension, specifically comprising:
in actual operation, the situation of hysteresis exists due to automatic change of parameters, for example, after a welding seam of a front steel coil and a rear steel coil enters the S1 frame, the pressing parameters, the bending rolls and the shifting rolls of the rear steel coil at the S1 frame are adjusted, after the welding seam enters the S2 frame, the tension set between the S1 and the S2 frame of the rear steel coil is adjusted, the change of the rolling parameters of the front steel coil and the rear steel coil needs to be checked for the hysteresis of adjustment, and the tension set value between the front steel coil frame and the rear steel coil frame is mainly compared with the increased state or the reduced state, so that smooth transition of the continuous rolling unit after start-up is ensured.
And determining whether the change of the tension set value of the front and rear steel coils exceeds a set range or not according to the parameter change of the front and rear steel coils after the inspection, performing a first operation if the change exceeds the set range, and performing a second operation if the change belongs to the set range.
The first operation is:
if the parking position is selected between the S1-S2 frames, adjusting the tension between the adjacent frames behind the S1-S2 frames (between the S2-S3 frames, between the S3-S4 frames and between the S4-S5 frames in the embodiment of the invention) in the direction that the rolling parameters of the later coiled steel coil approach by increasing or decreasing by 10-20%, and carrying out the start operation by the adjusted tension;
if the parking position is selected between the S2-S3 frames, according to the content of the inspection parameters, the tension between the adjacent frames (between the S3-S4 frames and between the S4-S5 frames in the embodiment of the invention) behind the S2-S3 frames is adjusted by increasing or decreasing 10-20% in the direction that the rolling parameters of the later coil of steel approach, and the start operation is carried out by the adjusted tension;
the second operation includes: if the front and rear coil parameters are basically close to each other, the adjustment is not needed, namely the original steel coil rolling parameters are used for carrying out the start operation.
And after the adjustment is finished, normal starting operation control is carried out, and the plate type and the like are adjusted conventionally.
S4: according to the selected parking position, determining a method for processing front and rear coils after the start and the shearing of the continuous rolling mill set, and processing the front and rear coils by the determined method for processing the front and rear coils, specifically comprising the following steps:
if the parking position is selected between the S1-S2 racks, namely the rolling reduction of the next coil is more than 70%, the relative rolling reduction of the S1 rack is about 30%, the lower coil is cut off by 30m-40m of the outer ring at an offline inspection station, the residual 5-10m of the thickness fluctuation part is reserved, and the coil is not required to be cut off in rolling;
if the parking position is between the S2-S3 frames, namely the rolling reduction of the next coil is less than 70%, and the relative rolling reduction of the S1 + S2 frames is 50-60%, the outer ring of the coil which is fed off is cut off by 20-30m at an off-line inspection station, and the residual part with the thickness of 5-10m is reserved, so that the coil which is being rolled does not need to be cut off.
The treatment method is different according to the elongation of the reduction ratio. The number of remarked meters can be increased appropriately or the excision can be carried out according to the maximum number of meters.
The specific application is as follows:
1) determining that the connection condition of the front and the rear rolls meets the requirement:
wherein, the specification of the front roll raw material is as follows: 5.0mm 1278 mm; specification after front coiling and rolling: 1.51mm 1253 mm; and (3) specification of the back-rolled raw materials: 5.0mm 1279 mm; and (3) post-rolling specification: 1.825mm 1253 mm.
The connection requirement between steel coils is as follows: the specification is carried out according to a plan, the steel grade meets the planned scheduling, the yield strength is connected with 35MPa, the width is connected with no more than 1mm, the thickness is connected with 0mm, and the method is suitable for the operation method shown in the embodiment of the invention and shown in figure 2.
2) Determining the parking position by the steel coil connection reduction rate difference:
judgment condition 1: the difference value of the engaging rolling reduction rates of the front steel coil and the rear steel coil is within 15 percent;
judgment condition 2: after the condition 1 is met, the rolling reduction rate of the subsequent steel coil is lower than 70%, and the roll changing parking position is selected between the S2-S3 racks, as shown in figure 2.
3) Checking the rolling parameter change of the coil before and after the inspection:
during actual parking, due to the fact that lag exists in automatic parameter change, a welding seam is parked between the S2-S3 frames, the pressing parameters, the bending roller and the shifting roller of the subsequent steel coil S1 and S2 frames are adjusted, and the set tension between the S1-S2 frames is adjusted.
For the adjustment hysteresis, the change of the rolling parameters of the front and rear coils is checked, and the tension set values of the front and rear coils are found to be not changed greatly, so that the normal transition can be realized without adjustment, as shown in the table I.
Figure BDA0002586727890000051
Watch 1
If the tension set value of the front roll specification is smaller than that of the rear roll specification, the tension set value of the rear roll between the stopped frames is adjusted to be close to the tension set value of the rear roll before starting, and normal starting transition is guaranteed, as shown in table 2.
Figure BDA0002586727890000052
Watch two
If the tension set value of the front roll specification is larger than that of the rear roll specification, the tension set value of the rear roll between the stopped frames is adjusted to be close to that of the rear roll before starting, and normal starting transition is guaranteed, as shown in the third table.
Figure BDA0002586727890000053
Watch III
4) A start operation process:
parking between the racks S2-S3 according to the selected parking position, and no adjustment is needed according to the content of the inspection parameters.
And executing normal starting operation control, and performing conventional adjustment on the plate type and the like.
5) The front and rear rolls are processed by the determined front and rear roll processing method, as the parking position is between S2-S3 frames, namely the rolling reduction of the rear roll is less than 70%, basically the relative rolling reduction of the S1 + S2 frames is 53%, the outer ring 25m of the lower roll needs to be cut off at an off-line inspection station, and the residual 5m thickness fluctuation part is used for normal process cutting of a rear production line; the rolls are rolled without cutting, and the next production line produces the rolls normally.
According to the method for reducing the shutdown loss of the continuous rolling mill, provided by the embodiment of the invention, through optimizing the process, the thickness fluctuation part needing to be cut off when the existing active shutdown is required can be reduced, so that the cutting loss length is reduced by 10-15 m/time, and the yield of the strip steel is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (5)

1. A method of reducing tandem mill stand-down losses, the method comprising:
determining that the connection condition of the front and rear coils of the parking welding line meets the requirement;
determining a parking position according to the difference value of the engaging screw-down rates of the front steel coil and the rear steel coil;
according to the selected parking position, determining tension adjustment between the racks behind the parking position, and carrying out vehicle starting operation by the adjusted tension;
and determining a processing method for the front and rear coils after the start and the shearing of the continuous rolling unit according to the selected parking position, and processing the front and rear coils by the determined processing method for the front and rear coils.
2. The method for reducing the parking loss of the continuous rolling mill according to claim 1, wherein the step of determining that the connection condition of the front coil and the rear coil of the parking weld meets the requirement specifically comprises the following steps:
determining the thickness of the raw material to be 6.0-2.0mm, the width of the raw material to be 800-1860mm, the output thickness to be 2.6-0.2mm, and the difference between the output width and the width of the raw material to be 0-100 mm;
determining the yield strength connection between the front and the rear rolls to be 0-200MPa, the width connection difference to be 0-150mm and the thickness connection difference to be 0-0.5 mm.
3. The method for reducing the parking loss of the continuous rolling mill as claimed in claim 1, wherein the determining the parking position according to the difference between the engaging reduction ratios of the front and rear steel coils specifically comprises:
confirming that the difference value of the engaging rolling reduction rates of the front and the rear steel coils is within 0-15%;
if the rolling reduction of the latter coil of steel is lower than 70%, determining that the parking position is selected between the S2-S3 racks;
and if the rolling reduction rate of the latter coil is higher than or equal to 70%, determining that the parking position is selected between the S1-S2 racks.
4. The method for reducing parking loss of a tandem mill according to claim 3, wherein the step of determining tension adjustment between stands located behind parking positions according to the selected parking positions and performing a vehicle lifting operation with the adjusted tension comprises the following steps:
checking the parameter change of the front and the rear steel coils, determining whether the change of the tension set value of the front and the rear steel coils exceeds a set range, if so, performing a first operation, and if the change of the tension set value of the front and the rear steel coils belongs to the set range, performing a second operation;
the first operation includes:
if the parking position is selected between the S1-S2 frames, adjusting the tension between the adjacent frames behind the S1-S2 frames by increasing or decreasing 10-20% in the direction that the rolling parameters of the later coiled steel coil approach, and carrying out the start operation by the adjusted tension;
if the parking position is selected between the S2-S3 frames, according to the content of the inspection parameters, the tension between the adjacent frames behind the S2-S3 frames is adjusted by increasing or decreasing 10-20% in the direction that the rolling parameters of the next coil of steel are close to each other, and the start operation is carried out by the adjusted tension;
the second operation includes: and carrying out the start operation according to the original steel coil rolling parameters.
5. The method for reducing the stop loss of the continuous rolling mill according to claim 4, wherein the method for processing the front and rear coils after the start and shearing of the continuous rolling mill set is determined according to the selected stop position, and the method for processing the front and rear coils according to the determined front and rear coil processing method specifically comprises the following steps:
if the parking position is selected between the S1-S2 racks, 30m-40m of an outer ring of the lower coil is cut off at an offline inspection station, the remaining 5-10m of the thickness fluctuation part is reserved, and the coil is not required to be cut off in rolling;
if the parking position is between the racks S2-S3, the outer ring of the coil is cut off by 20-30m at an off-line inspection station for the lower coil, and the residual thickness fluctuation part of 5-10m is reserved, so that the coil is not required to be cut off in the process of rolling.
CN202010683740.5A 2020-07-16 2020-07-16 Method for reducing stop loss of continuous rolling mill Active CN111774422B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2189329A (en) * 1935-07-16 1940-02-06 American Rolling Mill Co Tension rolling means
JPS57181702A (en) * 1981-05-01 1982-11-09 Nippon Steel Corp Continuous cold rolling method that entails roll changing
JPS60257916A (en) * 1984-06-06 1985-12-19 Nippon Steel Corp Plate thickness controlling method
CN1166387A (en) * 1996-05-29 1997-12-03 鞍山钢铁集团公司 Control system for automatic speed reduction and accurate stop of reversible cold roller
CN1883833A (en) * 2005-06-21 2006-12-27 王宇 Multi-roller multi-frame reversing cold mill and rolling method therefor
CN206794374U (en) * 2017-05-31 2017-12-26 武钢集团昆明钢铁股份有限公司 A kind of blooming mill emergency stop (apparatus)
CN110142314A (en) * 2019-06-05 2019-08-20 北京首钢冷轧薄板有限公司 A kind of galvanized wire weld seam crosses the control method and device of polishing machine tension fluctuation

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2189329A (en) * 1935-07-16 1940-02-06 American Rolling Mill Co Tension rolling means
JPS57181702A (en) * 1981-05-01 1982-11-09 Nippon Steel Corp Continuous cold rolling method that entails roll changing
JPS60257916A (en) * 1984-06-06 1985-12-19 Nippon Steel Corp Plate thickness controlling method
CN1166387A (en) * 1996-05-29 1997-12-03 鞍山钢铁集团公司 Control system for automatic speed reduction and accurate stop of reversible cold roller
CN1883833A (en) * 2005-06-21 2006-12-27 王宇 Multi-roller multi-frame reversing cold mill and rolling method therefor
CN206794374U (en) * 2017-05-31 2017-12-26 武钢集团昆明钢铁股份有限公司 A kind of blooming mill emergency stop (apparatus)
CN110142314A (en) * 2019-06-05 2019-08-20 北京首钢冷轧薄板有限公司 A kind of galvanized wire weld seam crosses the control method and device of polishing machine tension fluctuation

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