CN110369497B - A kind of high silicon thin strip non-oriented silicon steel cold rolling control method - Google Patents
A kind of high silicon thin strip non-oriented silicon steel cold rolling control method Download PDFInfo
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- 238000005097 cold rolling Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 39
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 28
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 27
- 239000010703 silicon Substances 0.000 title claims abstract description 23
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title description 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 64
- 239000010959 steel Substances 0.000 claims abstract description 64
- 238000005096 rolling process Methods 0.000 claims abstract description 47
- 230000007704 transition Effects 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 230000002441 reversible effect Effects 0.000 claims abstract description 5
- 239000000839 emulsion Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 239000012535 impurity Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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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
- B21B1/22—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- B21B1/22—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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- 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
- B21B2001/225—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 hot-rolling
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Abstract
The invention relates to a cold rolling control method for high-silicon thin-strip non-oriented silicon steel, which comprises the following steps of: si is more than or equal to 3.0 percent, Al is more than or equal to 0.8 percent, and the thickness of a finished product is less than or equal to 0.35 mm; and during the first cold rolling pass, the thickness transition rolling is adopted within the range of 30-50 m from the tail part of the strip steel, at least 2 pairs of friction rollers are arranged in front of a rolling mill on the threading side of the second cold rolling pass, and the edge part of the strip steel is subjected to friction heating. The friction roller is additionally arranged behind the cold rolling and uncoiling device of the single-stand reversible rolling mill, the friction roller is put into use during the second pass of cold rolling and threading and lifting, the friction roller is stopped being used when the thickness of the strip steel is transited to a normal control range, and meanwhile, the edge of the strip steel is heated more uniformly by controlling the cold rolling process, so that the production difficulty is reduced, and the brittle failure rate is reduced.
Description
Technical Field
The invention relates to the technical field of non-oriented silicon steel production, in particular to a cold rolling control method for high-silicon thin-strip non-oriented silicon steel.
Background
The high-grade non-oriented silicon steel product is widely applied to the manufacture of high, fine and sharp motors and instrument iron cores, and is an important metal functional soft magnetic material. Along with the increase of the silicon content, the brittleness of the strip becomes larger, the strip breakage rate is increased, particularly for high-silicon thin strip products with the silicon content exceeding 3.0%, in the cold rolling process, the brittleness of the material is added with the edge defects or edge rolling cracks of the incoming strip steel, and the strip breakage is frequent in the second-pass strip threading and pulling process. Although the high-silicon thin strip product is heated in a water bath according to the convention before cold rolling and is matched with aging rolling to ensure the strip temperature rolling of the strip steel, in the second pass strip-threading and start-up process, because normalized edges are not uniformly cooled, cracks are often formed on the edges, cracks are expanded along the transverse direction of the strip steel under the action of tension to generate brittle fracture, the surface quality of the strip steel is reduced (the influence of the environmental temperature is added, the brittleness is more obvious in winter), the production is forced to be suspended sometimes, the heating is carried out again, the yield is reduced, the cost is increased, and the working strength is increased.
In the prior art, the patent number CN201010562032.2 of Bao Steel, which is published in Bao Steel, is mainly for silicon steel with silicon content more than 2.3%, and the band breakage of the head and the tail of the strip steel is reduced by controlling the front and back tension of the strip steel, the reduction rate of each pass and the emulsion flow; however, the method has little effect on silicon steel with silicon content more than 3.0%.
The patent number is CN201610487428.2, aiming at the problem that two sides of a material with a brittle edge which is rolled and cracked are connected with a material with certain strength and shaping, the processing capability of the edge is strengthened, so that an alloy thin plate with a good surface and without edge cracking is obtained. The method is technically advanced, but is difficult to implement in large-scale production.
Wu steel discloses a method for controlling cold rolling edge crack after normalization of high magnetic induction oriented silicon steel (patent number is CN201410644651.4), which mainly controls a normalizing nozzle to realize cross cooling, and water spray cooling is not carried out within 30mm of the edge of strip steel.
Disclosure of Invention
The invention provides a cold rolling control method for non-oriented silicon steel of a high-silicon thin strip, which is characterized in that a friction roller is additionally arranged behind a cold rolling uncoiling device of a single-rack reversible rolling mill, the friction roller is put into the cold rolling second pass of strip threading and lifting, the friction roller is stopped when the thickness of the strip steel is transited to a normal control range, and meanwhile, the edge part of the strip steel is heated more uniformly by controlling a cold rolling process, so that the production difficulty is reduced, and the brittle failure rate is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cold rolling control method for high-silicon thin-strip non-oriented silicon steel is suitable for a process of producing cold-rolled non-oriented silicon steel by a single-stand reversible rolling mill, and comprises the following components in percentage by weight: si is more than or equal to 3.0 percent, Al is more than or equal to 0.8 percent, and the thickness of a finished product is less than or equal to 0.35 mm; the cold rolling control method comprises the following steps:
when the first cold rolling pass is carried out, the reduction rate is 35% -45%, the thickness transition rolling is adopted within the range of 30-50 m from the tail of the strip steel, the reduction is gradually reduced, and the thickness of the tail of the strip steel is transited to the thickness of an original hot rolled plate;
at least 2 pairs of friction rollers are arranged in front of a rolling mill on the threading side of the second cold rolling pass, and the edges of the strip steel are subjected to friction heating; the friction roller is put into the rolling mill when the second pass of rolling is started, the friction roller is stopped to be used when the strip threading is finished and the thickness of the rolled strip steel reaches the target thickness of the pass, and the temperature of the edge of the strip steel is ensured to be more than 50 ℃;
the theoretical heating temperature of the strip steel edge is calculated according to the following formula:
in the formula: TW- -edge temperature of strip at deg.C;
T0-room temperature, deg.c;
k1-the number of frictionally interactive faces;
k2- -correction coefficient, take 0.1-0.5;
μ — coefficient of friction;
f- -normal pressure, KN;
v- -relative sliding velocity at the center of the friction roll radius, m/s;
h-strip thickness, mm;
s- -effective contact area, m2；
Km- -thermal conductivity, W/m.K.
And during the first rolling, the flow of the emulsion at the inlet side of the rolling mill is 1500-2500L/min according to the running direction of the strip steel.
The friction roller is a vertical roller, the diameter of the friction roller is 180-220 mm, the material is 5CrNiMo, and the hardness HRC is more than or equal to 52.
Compared with the prior art, the invention has the beneficial effects that:
1) the tail part of the strip steel is rolled by adopting a thickness transition method during the first pass of rolling, so that the strip threading is facilitated during the second pass of rolling;
2) the friction roller is arranged in front of the cold rolling mill, so that the aim of uniformly heating the edge of the strip steel is fulfilled, and the stable and smooth cold rolling is ensured;
3) the non-oriented silicon steel for the high-silicon thin strip produced by the method reduces the cold rolling strip breakage rate by more than 1.50 percent, can ensure the stable and smooth production and reduces the production cost.
4) The method of the invention is particularly suitable for the case that the room temperature is lower than 15 ℃.
Detailed Description
The invention relates to a cold rolling control method of high-silicon thin-strip non-oriented silicon steel, which is suitable for a process of producing the cold rolling non-oriented silicon steel by a single-stand reversible rolling mill, wherein the cold rolling non-oriented silicon steel comprises the following components in percentage by weight: si is more than or equal to 3.0 percent, Al is more than or equal to 0.8 percent, and the thickness of a finished product is less than or equal to 0.35 mm; the cold rolling control method comprises the following steps:
when the first cold rolling pass is carried out, the reduction rate is 35% -45%, the thickness transition rolling is adopted within the range of 30-50 m from the tail of the strip steel, the reduction is gradually reduced, and the thickness of the tail of the strip steel is transited to the thickness of an original hot rolled plate;
at least 2 pairs of friction rollers are arranged in front of a rolling mill on the threading side of the second cold rolling pass, and the edges of the strip steel are subjected to friction heating; the friction roller is put into the rolling mill when the second pass of rolling is started, the friction roller is stopped to be used when the strip threading is finished and the thickness of the rolled strip steel reaches the target thickness of the pass, and the temperature of the edge of the strip steel is ensured to be more than 50 ℃;
the theoretical heating temperature of the strip steel edge is calculated according to the following formula:
in the formula: TW- -edge temperature of strip at deg.C;
T0-room temperature, deg.c;
k1-the number of frictionally interactive faces;
k2- -correction coefficient, take 0.1-0.5;
μ — coefficient of friction;
f- -normal pressure, KN;
v- -relative sliding velocity at the center of the friction roll radius, m/s;
h-strip thickness, mm;
s- -effective contact area, m2；
Km- -thermal conductivity, W/m.K.
And during the first rolling, the flow of the emulsion at the inlet side of the rolling mill is 1500-2500L/min according to the running direction of the strip steel.
The friction roller is a vertical roller, the diameter of the friction roller is 180-220 mm, the material is 5CrNiMo, and the hardness HRC is more than or equal to 52.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
In the embodiment, the thickness of the produced high-silicon thin non-oriented silicon steel strip is 0.35mm, and the high-silicon thin non-oriented silicon steel strip comprises the following chemical components in percentage by weight: c: 0.0025%, Si: 3.21%, Mn: 0.45%, P: 0.009%, S: 0.0021%, Als: 0.80%, N: 0.0020 percent; the balance of iron and inevitable impurity elements.
The main control technological parameters in the cold rolling process are as follows:
1. the reduction rate of the first pass rolling is 41%, the thickness step type control rolling is carried out when the strip steel is 30m away from the tail part, the thickness variation is 1.06 times of the minimum rolling thickness/m, and the thickness gradually increases to the thickness of the hot rolled plate; meanwhile, the flow of the emulsion at the inlet side in the rolling direction is 1600L/min, and the emulsion at the outlet side is closed.
2. When the strip is threaded in the second pass, the friction roller is put in at the room temperature of 15 ℃, the normal pressure of 4KN, the relative sliding speed of the center of the radius of the friction roller is 200m/s, the minimum value of the thickness of the transition section of the steel plate is 1.44mm, the correction coefficient is 0.35, the friction coefficient is 0.15, and the effective contact area is 0.0314m2The thermal conductivity of the steel material is 41W/m.K; the number of the friction contact surfaces is 2 (one is the friction contact surface of the strip steel, and the other is the friction contact surface of the friction roller), the temperature of the edge of the strip steel is calculated to be 62 ℃, and the feeding is stopped when the thickness of the strip steel meets the process requirement.
Compared with the conventional production process, the belt breakage rate of the embodiment is reduced by 1.5%.
[ example 2 ]
In this embodiment, the thickness of the produced high-silicon thin non-oriented silicon steel strip is 0.27mm, and the chemical composition is as follows: c: 0.0022%, Si: 3.05%, Mn: 0.50%, P: 0.010%, S: 0.0020%, Als: 1.06%, N: 0.0022%; the balance of iron and inevitable impurity elements.
The main control technological parameters in the cold rolling process are as follows:
1. the first pass reduction rate is 43%, the thickness step type control rolling is carried out when the strip steel is 32 meters away from the tail part, the thickness variation is 1.07 times of the minimum rolling thickness/meter, and the thickness gradually increases to the thickness of the hot rolled plate; simultaneously, the flow rate of the emulsion at the inlet side in the rolling direction is 1800L/min, and the emulsion at the outlet side is closed;
2. the friction roller is put into the steel plate in the second pass of strip threading, the room temperature is 10 ℃, the normal pressure is 3.5KN, the relative sliding speed is 300m/s, the minimum value of the thickness of the transition section of the steel plate is 1.31mm, the correction coefficient is 0.30, the friction coefficient is 0.15, and the effective contact area is 0.0314m2The thermal conductivity of the steel material is 41W/m.K; the number of the friction contact surfaces is 2; the temperature of the edge of the strip steel is 58 ℃ by calculation, and the feeding is stopped when the thickness of the strip steel meets the process requirement.
Compared with the conventional production process, the belt breakage rate of the embodiment is reduced by 1.7%.
[ example 3 ]
In this embodiment, the thickness of the produced high-silicon thin non-oriented silicon steel strip is 0.30mm, and the chemical components are as follows: c: 0.0027%, Si: 3.25%, Mn: 0.55%, P: 0.008%, S: 0.0024%, Als: 0.85%, N: 0.0030%; the balance of iron and inevitable impurity elements.
The main control technological parameters in the cold rolling process are as follows:
1. the first pass reduction rate is 42%, the thickness step-type controlled rolling is carried out when the strip steel is 38 meters away from the tail part, the thickness variation is 1.08 times of the minimum rolling thickness/meter, and the thickness gradually increases to the thickness of the hot rolled plate; meanwhile, the flow rate of the emulsion at the inlet side in the rolling direction is 2000L/min, and the emulsion at the outlet side is closed;
2. when the strip is threaded in the second pass, the friction roller is put in at the room temperature of 12 ℃, the normal pressure of 4.5KN and the relative sliding speed of 260m/s, at the moment, the minimum value of the thickness of the transition section of the steel plate is 1.33mm, the correction coefficient is 0.25, the friction coefficient is 0.15, and the effective contact area is 0.0314m2The thermal conductivity of the steel material is 41W/m.K; the number of the friction contact surfaces is 2; the temperature of the edge of the strip steel is 57 ℃ by calculation, and the feeding is stopped when the thickness of the strip steel meets the process requirement.
Compared with the conventional production process, the belt breakage rate of the embodiment is reduced by 1.60%.
[ example 4 ]
In this embodiment, the thickness of the produced high-silicon thin non-oriented silicon steel strip is 0.35mm, and the chemical components are as follows: c: 0.0027%, Si: 3.17%, Mn: 0.49%, P: 0.009%, S: 0.0016%, Als: 0.95%, N: 0.0028%; the balance of iron and inevitable impurity elements.
The main control technological parameters in the cold rolling process are as follows:
1. the first-pass reduction rate is 40%, the thickness step-type controlled rolling is carried out when the strip steel is 35m away from the tail part, the thickness variation is 1.07 times of the minimum rolling thickness/m, and the thickness gradually increases to the thickness of the hot rolled plate; meanwhile, the flow rate of the emulsion at the inlet side in the rolling direction is 1900L/min, and the emulsion at the outlet side is closed;
2. threading in the second passThe friction roller is put into the furnace, the room temperature is 10 ℃, the normal pressure is 4.8KN, the relative sliding speed is 240m/s, the minimum value of the thickness of the transition section of the steel plate is 1.38mm, the correction coefficient is 0.45, the friction coefficient is 0.10, and the effective contact area is 0.038m2The thermal conductivity of the steel material is 41W/m.K; the number of the friction contact surfaces is 2; the calculated temperature of the edge of the strip steel is 56 ℃, and the feeding is stopped when the thickness of the strip steel meets the process requirement.
Compared with the conventional production process, the belt breakage rate of the embodiment is reduced by 1.65%.
[ example 5 ]
In this embodiment, the thickness of the produced high-silicon thin non-oriented silicon steel strip is 0.35mm, and the chemical components are as follows: c: 0.0029%, Si: 3.19%, Mn: 0.48%, P: 0.008%, S: 0.0018%, Als: 0.92%, N: 0.0027 percent; the balance of iron and inevitable impurity elements.
The main control technological parameters in the cold rolling process are as follows:
1. the first pass reduction rate is 43%, the thickness step type control rolling is carried out when the strip steel is 37 m away from the tail part, the thickness variation is 1.06 times of the minimum rolling thickness/m, and the thickness gradually increases to the thickness of the hot rolled plate; meanwhile, the flow rate of the emulsion at the inlet side in the rolling direction is 1900L/min, and the emulsion at the outlet side is closed;
2. when the strip is threaded in the second pass, the friction roller is put in at the room temperature of 12 ℃, the normal pressure of 4.4KN and the relative sliding speed of 265m/s, at the moment, the minimum value of the thickness of the transition section of the steel plate is 1.311mm, the correction coefficient is 0.40, the friction coefficient is 0.09, and the effective contact area is 0.028m2The thermal conductivity of the steel material is 41W/m.K; the number of the friction contact surfaces is 2; the calculated temperature of the edge of the strip steel is 59 ℃, and the feeding is stopped when the thickness of the strip steel meets the process requirement.
Compared with the conventional production process, the belt breakage rate of the embodiment is reduced by 1.55%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A cold rolling control method for high-silicon thin-strip non-oriented silicon steel is characterized by being applicable to the process of producing the cold-rolled non-oriented silicon steel by a single-stand reversible rolling mill, wherein the cold-rolled non-oriented silicon steel comprises the following components in percentage by weight: si is more than or equal to 3.0 percent, Al is more than or equal to 0.8 percent, and the thickness of a finished product is less than or equal to 0.35 mm; the cold rolling control method comprises the following steps:
when the first pass of cold rolling is performed, the reduction rate is 35% -45%, the thickness transition rolling is performed within the range of 30-50 m from the tail of the strip steel, the reduction is gradually reduced, and the thickness of the tail of the strip steel is transited to the thickness of an original hot rolled plate, so that strip threading is performed during the second pass of rolling;
at least 2 pairs of friction rollers are arranged in front of a rolling mill on the threading side of the second cold rolling pass, and the edges of the strip steel are subjected to friction heating; the friction roller is put into the rolling mill when the second pass of rolling is started, the friction roller is stopped to be used when the strip threading is finished and the thickness of the rolled strip steel reaches the target thickness of the pass, and the temperature of the edge of the strip steel is ensured to be more than 50 ℃;
the theoretical heating temperature of the strip steel edge is calculated according to the following formula:
in the formula: t isW-strip edge temperature, deg.c;
T0-room temperature, deg.c;
k1-the number of frictionally interactive faces;
k2- -correction coefficient, take 0.1-0.5;
μ — coefficient of friction;
f- -normal pressure, KN;
v- -relative sliding velocity at the center of the friction roll radius, m/s;
h-strip thickness, mm;
s- -effective contact area, m2；
Km- -thermal conductivity, W/m.K.
2. The method for controlling the cold rolling of the high-silicon thin strip non-oriented silicon steel as claimed in claim 1, wherein the flow rate of the emulsion at the inlet side of the rolling mill is 1500-2500L/min in the running direction of the strip steel during the first rolling.
3. The method for controlling the cold rolling of the non-oriented silicon steel for the high-silicon thin strip as claimed in claim 1, wherein the friction roll is a vertical roll, the diameter of the friction roll is 180-220 mm, the material is 5CrNiMo, and the hardness HRC is not less than 52.
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| JP2008189976A (en) * | 2007-02-02 | 2008-08-21 | Nippon Steel Corp | Non-oriented electrical steel sheet with small iron loss deterioration due to compressive stress and method for producing the same |
| CN102476131A (en) * | 2010-11-26 | 2012-05-30 | 宝山钢铁股份有限公司 | Cold rolling method for preventing high-silicon strip steel from being broken |
| CN103882291B (en) * | 2012-12-21 | 2016-06-29 | 鞍钢股份有限公司 | High-silicon cold-rolled non-oriented electrical steel and preparation method thereof |
| CN108213077A (en) * | 2017-12-29 | 2018-06-29 | 武汉钢铁有限公司 | The method of cold rolling >=2.5%Si high silicon steel |
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