CN113083896A - Process for controlling burr-like thickness fluctuation of silicon steel and silicon steel sheet product prepared by same - Google Patents
Process for controlling burr-like thickness fluctuation of silicon steel and silicon steel sheet product prepared by same Download PDFInfo
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- CN113083896A CN113083896A CN202110192619.7A CN202110192619A CN113083896A CN 113083896 A CN113083896 A CN 113083896A CN 202110192619 A CN202110192619 A CN 202110192619A CN 113083896 A CN113083896 A CN 113083896A
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 32
- 238000009749 continuous casting Methods 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 238000005097 cold rolling Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000005098 hot rolling Methods 0.000 claims abstract description 19
- 230000003247 decreasing effect Effects 0.000 claims abstract description 17
- 238000000137 annealing Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 5
- 238000005554 pickling Methods 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 34
- 238000001816 cooling Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000006872 improvement Effects 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ZKSQHBGSFZJRBE-UHFFFAOYSA-N [Si].[C].[Fe] Chemical compound [Si].[C].[Fe] ZKSQHBGSFZJRBE-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- 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
-
- 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
- B21B37/18—Automatic gauge control
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Metal Rolling (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a process for controlling burr-shaped thickness fluctuation of silicon steel, which comprises the following steps of; feeding the continuous casting billet into a heating furnace for heating, wherein the feeding temperature of the continuous casting billet is 400-plus-one (680 ℃), and the furnace time of the continuous casting billet is 185-plus-one (220 min); hot rolling the heated continuous casting billet, wherein the eccentricity of a roller is 0-0.025mm, and coiling the hot rolled strip steel; pickling and washing the coiled strip steel, and carrying out cold rolling, wherein the cold rolling operation mode is adjusted from a multi-stage speed increasing and decreasing mode to a one-time speed increasing and decreasing mode, and the MN-AGC gain coefficient is increased in the one-time speed increasing and decreasing stage; and coiling the cold-rolled strip steel, and annealing to obtain a finished silicon steel sheet product. The process for controlling the burr-shaped thickness fluctuation of the silicon steel, disclosed by the invention, optimizes and coordinates the heating, hot rolling, coiling and cold rolling processes, can effectively solve the problem of the burr-shaped thickness fluctuation of the silicon steel, realizes the improvement of the full-length thickness control precision of the non-oriented silicon steel, does not need equipment and system transformation, is easy to realize and popularize.
Description
Technical Field
The invention relates to the technical field of silicon steel production and coil rolling, in particular to a process for controlling burr-shaped thickness fluctuation of silicon steel and a silicon steel sheet product prepared by the process.
Background
Silicon steel refers to an ultra-low carbon silicon-iron alloy with silicon content of 0.5 to 4.5%, is mainly used as iron cores of various motors, generators, compressors, motors and transformers, and is an indispensable raw material product in the industries of electric power, household appliances and the like. The product needs to be stripped, stamped and laminated in the processing process, so that a high lamination coefficient is needed. The surface of the silicon steel sheet is smooth and flat, and the thickness of the silicon steel sheet is uniform, so that the silicon steel sheet is an important factor for ensuring the high lamination coefficient of the iron core. The current same-plate difference control requirement of silicon steel is less than or equal to 7 microns, and the problems of high iron loss, inconsistent magnetic performance and the like caused by gaps of laminated sheets due to large same-plate difference of the silicon steel seriously influence the quality and grade of silicon steel products. The burr-shaped thickness fluctuation is a typical type causing overlarge same-plate difference, and the thickness fluctuation curve is divided into three types of long period, short period and no period, as shown in figure 1. The reasons for generating the burr-shaped thickness fluctuation include the burr-shaped thickness fluctuation heredity of the hot coil finished product, the inclined stripes on the surface of the hot coil and the cold rolling speed increase and decrease.
The burr-shaped thickness fluctuation of the hot rolled finished product is influenced by a plurality of reasons, and the burr-shaped thickness fluctuation of the hot rolled finished product can be caused in the hot rolling and cold rolling processes. Wherein, in terms of hot rolling: the water beam mark generated by the plate blank in the heating furnace, the overlarge roll roller and the overlow finish rolling inlet temperature lead to the vibration of a rolling mill, the tension mismatch between the finish rolling and the steel throwing and the coiling and the oblique stripes generated when the tension of the pinch roll is overlarge. In the cold rolling aspect: the MN-AGC gain coefficient is too small in the speed increasing and reducing stage, the operation mode is a multi-stage, and the low-speed rolling phenomenon exists.
Therefore, the burr-shaped thickness fluctuation of the silicon steel is not caused by a single factor but is caused by the accumulation of a plurality of factors, so that the burr-shaped thickness fluctuation of the silicon steel needs to be solved by the coordination of the hot rolling procedure and the cold rolling procedure.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the problem of silicon steel burr-shaped thickness fluctuation caused by multiple factors in the prior art.
In order to solve the above technical problems, an object of the present invention is to provide a process for controlling burr-like thickness fluctuation of silicon steel, comprising the steps of:
feeding the continuous casting billet into a heating furnace for heating, wherein the feeding temperature of the continuous casting billet is 400-plus-one (680 ℃), and the furnace time of the continuous casting billet is 185-plus-one (220 min);
carrying out hot rolling on the heated continuous casting billet, wherein the eccentricity of a roller is 0-0.025mm, and the hot rolling comprises rough rolling and finish rolling;
coiling the hot rolled strip steel;
pickling and washing the coiled strip steel, and carrying out cold rolling, wherein the cold rolling operation mode is adjusted from a multi-stage speed increasing and decreasing mode to a one-time speed increasing and decreasing mode, and the MN-AGC gain coefficient is increased in the one-time speed increasing and decreasing stage;
and coiling the cold-rolled strip steel, and annealing to obtain a finished silicon steel sheet.
In one embodiment of the invention, the continuous casting slab is fed into the heating furnace for heating within 2 to 6 hours after being discharged from the continuous casting machine.
In one embodiment of the invention, in the hot rolling, the time for waiting for entering the finish rolling group for rolling after the multiple rough rolling is 0-25 s.
In one embodiment of the invention, the roller way is manually rotated to move forward and backward in a staggered manner when the continuous casting billet is waiting.
In one embodiment of the invention, the finish rolling is performed by polishing the steel at a constant speed of 12.2-13.5 m/s.
In one embodiment of the invention, the position compensation of the threading position of the winding side guide plate is 0-30mm during winding.
In one embodiment of the invention, the pinch roll is calibrated to have a tension compensation of 50-50 KN/side during reeling.
In one embodiment of the invention, the strip steel coiled after hot rolling is subjected to stack cooling before cold rolling, and the strip steel is straightened and flattened after cooling.
In one embodiment of the invention, after the strip steel is straightened and leveled, the strip steel is pickled, then cold rolled and annealed to obtain the finished silicon steel sheet.
Another object of the present invention is to provide a silicon steel sheet product manufactured by the above process for controlling burr-like thickness fluctuation of silicon steel.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the process for controlling the burr-shaped thickness fluctuation of the silicon steel, disclosed by the invention, optimizes and coordinates the heating, hot rolling, coiling and cold rolling processes, can effectively solve the problem of the burr-shaped thickness fluctuation of the silicon steel, realizes the improvement of the full-length thickness control precision of the non-oriented silicon steel, does not need equipment and system transformation, is easy to realize and popularize.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a periodic classification chart of a silicon steel burr-shaped thickness fluctuation curve.
FIG. 2 is a schematic view of process parameters in examples 1 to 3 of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
In the following embodiments, the adopted equipment is a 1450 hot continuous rolling and 1420 cold continuous rolling production line in a certain plant, and the MN-AGC in the present specification refers to an automatic control system for the hot continuous rolling thickness of strip steel.
Embodiments 1 to 3, a process for controlling burr-like thickness fluctuation of silicon steel, the process flow comprising the steps of:
s10, feeding the continuous casting slab into a heating furnace for heating within 2-6h after the continuous casting machine is fed, wherein the feeding temperature of the continuous casting slab is 400-680 ℃, and the feeding time of the continuous casting slab is 185-220 min;
s20, carrying out hot rolling on the heated continuous casting billet, wherein the eccentricity of a roller is 0-0.025mm, the hot rolling comprises rough rolling and finish rolling, the time for the continuous casting billet to enter a finish rolling group for rolling is 0-25S after the multiple rough rolling is finished, the continuous casting billet can manually rotate a roller way to carry out forward and reverse staggered movement when waiting, and steel is thrown at a constant speed of 12.2-13.5m/S when finish rolling is carried out;
s30, coiling the hot rolled strip steel, wherein the position compensation of a strip penetrating position of a coiling side guide plate is 0-30mm, and the tension compensation calibrated by a pinch roll is 50 KN/side;
s40, performing heap cooling on the coiled strip steel;
s50, straightening and flattening the cooled strip steel;
s60, carrying out acid washing on the straightened and flattened strip steel;
s70, cold rolling the pickled strip steel, wherein the cold rolling operation mode is adjusted from a multi-stage speed increasing and decreasing mode to a one-time speed increasing and decreasing mode, and the MN-AGC gain coefficient is increased in the one-time speed increasing and decreasing stage;
and S80, coiling the cold-rolled strip steel, and annealing to obtain a silicon steel sheet finished product.
The continuous casting billet is fed into the heating furnace for heating within 2-6 hours after being discharged from the continuous casting machine, the charging temperature of the continuous casting billet is 400-plus-680 ℃, the time of the continuous casting billet in the furnace is 185-plus-220 min, the uniformity of the temperature of the continuous casting billet is improved, the temperature influence caused by water beam marks is minimized, and the long-period burr-shaped thickness fluctuation is effectively solved.
According to the invention, the eccentricity of the roller is controlled to be 0-0.025mm during hot rolling, meanwhile, the waiting time of the continuous casting billet and the waiting mode that the continuous casting billet manually rotates the roller way to perform forward and reverse staggered movement in the waiting time are optimized, so that black marks caused by long-time stagnation of strip steel can be avoided, and the short-period burr-shaped thickness fluctuation is effectively solved.
The method adopts the constant-speed steel throwing of 12.2-13.5m/s during finish rolling, the position compensation of a strip penetrating position of a coiling side guide plate adopted during coiling is 0-30mm, and the tension compensation calibrated by a pinch roll during coiling is 50 KN/side, so that the problem of non-periodic burr-shaped thickness fluctuation caused by the inclined strip lines on the surface of the hot coil is effectively solved. And the cold rolling operation mode is adjusted from a multi-stage speed increasing and decreasing mode to a one-time speed increasing and decreasing mode, and the MN-AGC gain coefficient is increased in the one-time speed increasing and decreasing stage, so that the problem of non-periodic burr-shaped thickness fluctuation generated in the cold rolling process is effectively solved.
Examples 1 to 3, a process for controlling the burred thickness fluctuation of silicon steel, which mass-produces 45 coils of 50W1300, and the specification of the finished product is 0.5mm 1240mm, and the process flow is shown in the above, and the process parameters are shown in fig. 2.
The process flow of the comparative example comprises the following steps:
s100, feeding a continuous casting into a heating furnace for heating, wherein the feeding temperature of the continuous casting is 300 ℃, the furnace time of the continuous casting is 170min, and the continuous casting is fed into the heating furnace for heating within 8h after being discharged from a continuous casting machine;
s200, carrying out hot rolling on the heated continuous casting billet, wherein the eccentricity of a roller is 0.028mm, the hot rolling comprises primary rolling and finish rolling, the waiting time of the finish rolling of the continuous casting billet after the primary rolling is finished is 30S, the continuous casting billet is stopped when waiting, and steel is thrown at a constant speed of 14.5m/S when the finish rolling is carried out;
s300, coiling the hot rolled strip steel, wherein the position compensation of a strip penetrating position of a coiling side guide plate is 0-10mm, and the tension compensation calibrated by a pinch roll is 75 KN/side;
s400, performing heap cooling on the coiled strip steel;
s500, straightening and flattening the cooled strip steel;
s600, carrying out acid washing on the straightened and leveled strip steel;
s700, cold rolling the pickled strip steel, wherein the cold rolling operation mode is a multi-stage speed increasing and decreasing mode, and the MN-AGC gain coefficient is unchanged in the speed increasing and decreasing stage;
and S800, coiling the cold-rolled strip steel to obtain a finished silicon steel sheet product.
Results of comparison of examples 1 to 3 with comparative examples: in the examples 1-3, no burr-like thickness fluctuation occurs in 45 coils, the defect occurrence ratio is 0%, and the low-speed rolling phenomenon does not occur during cold rolling; in the comparative example, 10 rolls in total of 45 rolls had a problem of burr-like thickness fluctuation, the defect occurrence ratio was 22%, and the low-speed rolling phenomenon was observed in the cold rolling.
The embodiment of the invention also discloses a silicon steel sheet product prepared by the process for controlling the burr-shaped thickness fluctuation of the silicon steel.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A process for controlling burr-like thickness fluctuation of silicon steel, comprising the steps of:
feeding the continuous casting billet into a heating furnace for heating, wherein the feeding temperature of the continuous casting billet is 400-plus-one (680 ℃), and the furnace time of the continuous casting billet is 185-plus-one (220 min);
carrying out hot rolling on the heated continuous casting billet, wherein the eccentricity of a roller is 0-0.025mm, and the hot rolling comprises rough rolling and finish rolling;
coiling the hot rolled strip steel;
pickling and washing the coiled strip steel, and carrying out cold rolling, wherein the cold rolling operation mode is adjusted from a multi-stage speed increasing and decreasing mode to a one-time speed increasing and decreasing mode, and the MN-AGC gain coefficient is increased in the one-time speed increasing and decreasing stage;
and coiling the cold-rolled strip steel, and annealing to obtain a finished silicon steel sheet.
2. The process for controlling the burred thickness fluctuation of silicon steel according to claim 1, wherein: and the continuous casting slab is sent into a heating furnace for heating within 2-6 hours after being discharged from the continuous casting machine.
3. The process for controlling the burred thickness fluctuation of silicon steel according to claim 1, wherein: and in the hot rolling process, the time for waiting the continuous casting billet to enter a finish rolling group for rolling is 0-25s after the multiple rough rolling is finished.
4. The process for controlling the burred thickness fluctuation of silicon steel according to claim 1, wherein: when the continuous casting billet is waiting, the roller way is rotated manually to move in a forward and reverse staggered manner.
5. The process for controlling the burred thickness fluctuation of silicon steel according to claim 1, wherein: and during finish rolling, the steel is polished at a constant speed of 12.2-13.5 m/s.
6. The process for controlling the burred thickness fluctuation of silicon steel according to claim 1, wherein: and when in coiling, the position compensation of the strip penetrating position of the coiling side guide plate is 0-30 mm.
7. The process for controlling the burred thickness fluctuation of silicon steel according to claim 1, wherein: and when in coiling, the calibrated tension compensation of the pinch roll is 50 KN/side.
8. The process for controlling the burred thickness fluctuation of silicon steel according to claim 1, wherein: before cold rolling, the strip steel coiled after hot rolling is subjected to stack cooling, and after the strip steel is cooled, the strip steel is straightened and leveled.
9. The process for controlling silicon steel burr-like thickness variations as claimed in claim 8, characterized in that: and after the strip steel is straightened and leveled, pickling the strip steel, then cold rolling the strip steel, and annealing the strip steel to obtain a finished silicon steel sheet.
10. A silicon steel sheet product, characterized in that: produced by the process for controlling the burred thickness fluctuation of silicon steel according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110192619.7A CN113083896B (en) | 2021-02-20 | 2021-02-20 | Process for controlling burr-like thickness fluctuation of silicon steel and silicon steel sheet product |
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| CN202110192619.7A CN113083896B (en) | 2021-02-20 | 2021-02-20 | Process for controlling burr-like thickness fluctuation of silicon steel and silicon steel sheet product |
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| CN113083896B CN113083896B (en) | 2022-06-14 |
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2021
- 2021-02-20 CN CN202110192619.7A patent/CN113083896B/en active Active
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|---|---|---|---|---|
| JP2000005806A (en) * | 1998-06-25 | 2000-01-11 | Nkk Corp | Plate thickness variation prevention method by winding tension of cold rolling mill |
| JP2000140919A (en) * | 1998-11-05 | 2000-05-23 | Furukawa Electric Co Ltd:The | Device for analyzing variation in thickness, device for controlling thickness and method thereof and rolling mill provided with thickness controller |
| CN1743128A (en) * | 2005-09-29 | 2006-03-08 | 东北大学 | Method for producing oriented silicon steel band by direct rolling of continuous cast plate slab |
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| CN105195524A (en) * | 2015-10-21 | 2015-12-30 | 东北大学 | Plate and strip thickness compensation control method in speeding up or down rolling process during cold rolling |
| CN108817100A (en) * | 2018-04-24 | 2018-11-16 | 邯郸钢铁集团有限责任公司 | A method of judging that certain breast roller causes strip exit thickness to fluctuate |
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