CN116213458A - Method for improving quality of cold continuous rolling edge of high-grade non-oriented silicon steel for driving motor of new energy automobile - Google Patents
Method for improving quality of cold continuous rolling edge of high-grade non-oriented silicon steel for driving motor of new energy automobile Download PDFInfo
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- CN116213458A CN116213458A CN202310157726.5A CN202310157726A CN116213458A CN 116213458 A CN116213458 A CN 116213458A CN 202310157726 A CN202310157726 A CN 202310157726A CN 116213458 A CN116213458 A CN 116213458A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 71
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005554 pickling Methods 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000005098 hot rolling Methods 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000005097 cold rolling Methods 0.000 abstract description 12
- 230000002829 reductive effect Effects 0.000 abstract description 8
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- 238000005520 cutting process Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 35
- 239000010959 steel Substances 0.000 description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910004283 SiO 4 Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000013000 roll bending Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000037303 wrinkles Effects 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
- 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
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
Abstract
The invention discloses a method for improving the quality of cold continuous rolling edges of high-grade non-oriented silicon steel for a driving motor of a new energy automobile. Comprising the following steps: the pickling time t of the hot-rolled raw material is controlled as follows: t multiplied by Si%/600 is less than or equal to T and less than or equal to T multiplied by Si%/300; setting the roll shifting amount of the intermediate roll of the continuous rolling mill to be 30-80 mm; control range of the ratio L/R of the length L of the working roll body of the continuous rolling mill to the curvature radius R of the working roll surface: -0.25 < L/R < 0.15. According to the invention, by optimizing the pickling time of the hot rolled coil, adopting reasonable contour size of the working roll and adjusting the roll shifting amount of the intermediate roll, the edge wave generation is greatly weakened on the premise of inhibiting edge crack of the cold continuous rolled edge, the cold continuous rolled edge quality of the high-grade non-oriented silicon steel for the driving motor of the new energy automobile is improved under the condition that hot rolled raw materials are not cut, the high-efficiency production is realized, the edge cutting loss after cold rolling is reduced, and the yield is improved.
Description
Technical Field
The invention belongs to the technical field of application of non-oriented silicon steel, and particularly relates to a method for improving cold continuous rolling edge quality of high-grade non-oriented silicon steel for a driving motor of a new energy automobile.
Background
The non-oriented silicon steel is a soft magnetic material widely applied to the electric and electronic industries, and particularly, with the development of a high-speed motor represented by a new energy automobile driving motor in recent years, the non-oriented silicon steel is used as an important material for reducing high-frequency iron loss in the motor, and the requirements of the high-grade non-oriented silicon steel for the new energy automobile driving motor, particularly, the non-oriented silicon steel with the thickness of 0.30mm or below, are continuously blown out. The high-grade non-oriented silicon steel for the new energy automobile driving motor is generally rolled by a single stand and has low rolling efficiency due to the limitation of process characteristics, and the existing twenty-roller reversible single stand rolling mill can realize the production of the high-grade non-oriented electrical steel for the new energy automobile driving motor, but has the defects of low production efficiency and low yield due to frequent roller replacement and more plate defects. If the UCMW six-roller acid continuous rolling mill is adopted for production, the problem of broken belt is caused by edge crack generated by overlarge rolling force caused by larger diameter of working rollers.
In order to further improve the production capacity of the high-grade non-oriented silicon steel for the new energy automobile driving motor, reduce the production cost, simultaneously release the productivity of the twenty-roller reversible rolling mill, the high-grade non-oriented silicon steel for the new energy automobile driving motor is rolled on the acid continuous rolling mill, and particularly the high-grade non-oriented silicon steel for the new energy automobile driving motor with the thickness of 0.30mm or below becomes the development trend of the high-grade non-oriented silicon steel for the future new energy automobile driving motor. In the continuous rolling production process of high-grade non-oriented silicon steel for a new energy automobile driving motor, the rolling force is overlarge due to the fact that the diameter of a working roller is large, meanwhile, the elongation rate is low, microcracks are easy to initiate at the edge in the cold rolling process, the cracks are continuously expanded in the rolling process, the rolling mill is reduced in speed and is even broken, and the unit yield and rolling stability are severely restricted. In the rolling process, the metal at the edge of the strip steel flows in a transverse direction obviously besides flowing in a longitudinal direction, so that the rolling pressure and the roll flattening amount of the edge area of the strip steel are further reduced, the edge is easier to thin under the same rolling force, edge drop is generated, and meanwhile, edge waves are generated due to the control of the edge drop.
The most direct method for inhibiting edge crack of high-grade non-oriented silicon steel for a new energy automobile driving motor at present mainly comprises the steps of preheating a steel coil, so that the starting rolling temperature is increased, or the rolling speed is reduced in the rolling process. However, these methods all result in an increase in production cost and a decrease in production efficiency. The other method is complex but does not affect the production efficiency and cost, namely, the deflection of the two ends of the working roll, namely, the bending roll is controlled. The roll deflection may be by introducing an artificial bending moment at both ends of the work roll and/or by controlling the reduction per frame. However, this method is largely dependent on the experience of the cold rolling mill operator.
Regarding the technology for improving the quality of the cold continuous rolling edge of the high-grade non-oriented silicon steel for the driving motor of the new energy automobile, the related research results at home and abroad are as follows:
in order to effectively reduce the edge stress of strip steel, the patent (application number: CN 201510937541.1) discloses a control method for cold continuous rolling edge crack of high-grade non-oriented silicon steel, which avoids the problem of edge crack of the high-grade non-oriented silicon steel in the cold continuous rolling process, and reduces the load distribution of a first frame from 33-36% to 25-30% when the system automatically distributes the load; the roll shifting value of the working roll of the UCMW rolling mill is set to be-40-20 mm. Although the problem of edge cracking of the edge of the primary exit steel plate is improved by the reduction of the load distribution of the first stand, the load distribution of the rolling of the rear stand is necessarily increased, and the rolling load of the rear stand is increased sharply along with the increase of the deformation resistance, which is extremely unfavorable for edge cracking and plate type control.
The patent (application number: 202010420065.7) discloses a method for producing non-oriented silicon steel with the thickness of 0.35mm by using a cold continuous rolling mill, which comprises the steps of carrying out continuous five-frame cold rolling on a cold rolled raw material roll by adopting a one-time rolling method, carrying out process lubrication and cooling by controlling the rolling rate, rolling force, inter-frame tension and inlet-outlet side tension of each pass and adopting emulsion spraying, and carrying out partition cooling on a working roll, and controlling the thermal convexity of the working roll so as to regulate the shape of a steel belt, thereby obtaining an intermediate product of the non-oriented silicon steel with the thickness of 0.35 mm.
The literature 'technical research on high-precision section control of silicon steel of a wide-specification five-stand cold continuous rolling mill train' takes a ripple steel five-stand UCM cold continuous rolling mill train as a research object, and establishes a two-dimensional variable thickness finite element model of a six-roller mill train. The ECC working roll profile curve capable of realizing high-precision section control is developed, the edge drop of the product can be effectively controlled, and the section control precision of the non-oriented silicon steel product is improved.
The patent No. steel preparation technology (application No. 200810229737.5) obtains a full-length hot rolled steel coil without edge crack by controlling the smelting components and the hot rolling process of the steel; the cold rolling uncoiling temperature is increased, and the temperature of the strip steel is kept above the brittle transition point; the pickling-five-frame cold continuous rolling process is adopted, the rolling reduction rate of each cold rolling pass is reasonably distributed, and the cold continuous rolling unoriented high-grade steel is realized by utilizing the processing heat generated during strip steel rolling. The hot rolling method is mainly used for improving the quality of raw materials in steelmaking and improving the brittleness in cold rolling processing by utilizing thermomechanical property.
The above documents develop optimization for the edge quality of the cold continuous rolling of silicon steel, and cold rolling edge waves and edge cracks are respectively regulated by respective means, but no perfect means exist at present for controlling the edge waves and simultaneously effectively inhibiting the edge cracks, so that good edge quality is obtained.
Disclosure of Invention
In the existing method for improving the quality of the cold continuous rolling edge of the high-grade non-oriented silicon steel, the adopted means are single, and the control of edge drop, edge wave and edge crack is difficult to be simultaneously considered. The invention aims to provide a method for improving the quality of cold continuous rolling edges of high-grade non-oriented silicon steel for a driving motor of a new energy automobile, which is characterized in that the setting of the roll shifting position of a middle roll is realized by controlling the acid washing time of raw materials and simultaneously the optimization of the roll bending force of a working roll is matched, so that the purposes of reducing the edge waves and the edge drop of strip steel are achieved, the optimal quality of cold rolling edges is obtained, and the production efficiency and the product yield are improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a improve method of high grade non-oriented silicon steel cold tandem rolling limit portion quality for new energy automobile driving motor, the cold tandem rolling adopts UCMW five-frame tandem rolling unit, the method includes:
the pickling time t of the hot-rolled raw material is controlled as follows:
T×Si％/600≤t≤T×Si％/300
wherein: t is the hot rolling coiling temperature, and Si% is the mass percent weight of Si in the high-grade non-oriented silicon steel;
setting the roll shifting amount of the intermediate roll of the continuous rolling mill to be 30-80 mm;
control range of the ratio L/R of the length L of the working roll body of the continuous rolling mill to the curvature radius R of the working roll surface:
-0.25≤L/R≤-0.15
wherein: the working roll is a concave roll, and R takes a negative value corresponding to the negative bending roll.
According to the scheme, the Si percentage in the non-oriented silicon steel is 2-4%.
According to the scheme, the hot rolling coiling temperature is 550-750 ℃.
The invention adopts a method for improving the quality of cold continuous rolling edges of high-grade non-oriented silicon steel for a new energy automobile driving motor, and the specific mechanism is as follows:
the influence of the pickling time on the rolling edge crack of the high-grade silicon steel mainly comprises two reasons: (1) According to the conventional pickling experience, the pickling time is too long, and the material is easy to generate the phenomenon of over-pickling, so that the mechanical property of the material is affected, and brittle fracture occurs; (2) The pickling time can influence the appearance, roughness and the like of the surface of the strip steel, on one hand, the friction state of the strip steel and the roller is changed, and the plastic damage of the edge part is increased; meanwhile, the pickling time is long, and adverse effects are easily generated on the quality of the edge of the strip steel, so that the crack is more easily expanded to generate edge crack under the action of tensile stress on the edge of the strip steel.
Hot rolled steel sheets with a high silicon content are particularly prone to scale which is difficult to remove. On the one hand, si and Fe easily generate layered Fe between the iron scale and the steel base in the high-temperature heating process of the steel 2 SiO 4 (2FeO·SiO 2 ) The solidification temperature is 1170 ℃, and the interface temperature causes Fe to be at the time of hot rolling descaling 2 SiO 4 The liquid phase is reduced to the solid phase, and then the molten state is formed, so that the molten state invades into the iron scale and the steel base in a wedge shape, and the peeling property of the iron scale is poor.
As the coiling temperature decreases, fe 2 O 3 The content is reduced, the thickness of the oxide skin is gradually reduced, meanwhile, the Si-rich layer between the oxide layer and the matrix is also gradually thinned, the surface morphology is changed from island-shaped distributed whiskers into clustered spiral columnar crystal structures, the surface is loose and porous, and wrinkles, bubbles, even cracks and falls off under the action of internal stress, so that the pickling dephosphorization is facilitated. The pickling time is closely related to the hot rolling coiling temperature T and the silicon content, when T is less than T multiplied by Si%/600, the oxide scale is difficult to thoroughly remove, and when T is more than T multiplied by Si%/300, the pickling is performed, and the quality of the surface and the edge of the strip steel is affected. In order to realize effective pickling, the pickling time t of the hot-rolled raw material is controlled to be: t is less than or equal to 600 percent and less than or equal to 300 percent, and the quality of the surface and the edge of the strip steel is ensured while the iron scale is completely removed.
In the existing strip steel edge shape control technology of the cold rolling UCM rolling mill, firstly, the measured shape value of a strip steel edge shape instrument channel of a last stand outlet is used for subtracting a target shape value to obtain edge shape deviation. Then, judging the edge shape state of the strip steel according to the edge shape deviation: when the deviation of the edge shape is larger than the given upper limit, the edge of the strip steel is considered to be locally loose, and the edge waves are corresponding at the moment; when the deviation of the edge shape is smaller than the given lower limit, the edge of the strip steel is considered to be partially tight, and the corresponding edge is cracked.
The intermediate roller changes the contact force distribution between the intermediate roller and the working roller by changing the position of the CVC roller through the tandem roller, so that the deformation of the working roller is further changed to realize the control and adjustment of the strip steel plate shape, and the convexity adjustment domain of the roll gap indirectly represents the control capability of the rolling mill on the plate shape. When the roll shifting amount of the middle roll is lower than 30mm, the edge of the strip steel is partially loosened, edge waves are easy to appear at the moment, and when the roll shifting amount of the middle roll is higher than 80mm, the edge of the strip steel is partially tightened, and edge cracks and even strip breakage are easy to appear at the moment.
If the shape of a bending roller of the rolling mill is proper in the rolling process, the working roller is set to be a proper convex roller or concave roller, and edge cracking of the steel strip in the cold rolling process can be well restrained. When the crowning roller (positive bending roller) is adopted, L/Rp is more than 0, the length of the edge crack is longer, and as Rp increases, L/Rp gradually decreases, the length of the edge crack gradually decreases, and when L/Rp approaches 0, the crowning roller becomes a flat roller. Edge cracking also occurs when flat rolls are used, because there is also a tensile stress in the rolling direction, regardless of the topography of the work rolls. When a concave roller (negative roll) is used, L/R N Less than 0, the crack tip propagation speed gradually becomes slow, L/R N At < -0.15, the crack tip closes, does not propagate further, and even at greater reduction the edge crack does not propagate and closes. When the working roll adopts a concave roll, edge waves are generated at the edge, and the edge is easier to extend in the rolling process as the ductility of the material is higher. In this case, the concave rolls increase the probability of producing large waves during rolling. However, the high grade non-oriented silicon steel has the advantages of higher alloy content, poorer ductility and insignificant negative influence of concave rollers on the side wave control, but in order to improve the rolling yield and the level of the same plate difference, L/R of-0.25 is selected N ＜-0.15。
The beneficial effects of the invention are as follows:
according to the invention, by optimizing the pickling time of the hot rolled coil, adopting reasonable contour size of the working roll and adjusting the roll shifting amount of the intermediate roll, the edge wave generation is greatly weakened on the premise of inhibiting edge crack of the cold continuous rolled edge, the cold continuous rolled edge quality of the high-grade non-oriented silicon steel for the driving motor of the new energy automobile is improved under the condition that hot rolled raw materials are not cut, the high-efficiency production is realized, the edge cutting loss after cold rolling is reduced, and the yield is improved.
Detailed Description
The technical scheme of the invention is further explained by the specific examples.
The embodiment of the invention provides a method for improving the quality of cold continuous rolling edges of high-grade non-oriented silicon steel, wherein the cold continuous rolling adopts a UCMW five-frame continuous rolling unit, and the method comprises the following steps:
1) The pickling time t of the hot-rolled raw material is controlled as follows:
T×Si％/600≤t≤T×Si％/300
wherein: t is the hot rolling coiling temperature, and Si% is the mass percentage weight of Si in the high-grade non-oriented silicon steel.
2) Setting the roll shifting amount of the intermediate roll of the continuous rolling mill to be 30-80 mm;
3) Control range of the ratio L/R of the length L of the working roll body of the continuous rolling mill to the curvature radius R of the working roll surface:
-0.25≤L/R≤-0.15
wherein: the working roll is a concave roll, and R takes a negative value corresponding to the negative bending roll.
The following are specific examples:
example 1 and comparative example 1
Silicon content of hot rolling raw material: 3.30%, thickness 2.1mm, target product thickness 0.30mm, hot rolling coiling temperature, pickling time, intermediate roll and work roll parameters, and corresponding rolling conditions are shown in Table 1, wherein in Table 1, examples 1-1 to examples 1-5 are different groups of example 1, and comparative examples 1-1 to comparative examples 1-7 are different groups of comparative example 1.
TABLE 1 comparison of the Process and Rolling conditions in example 1 and comparative example 1
Example 2 and comparative example 2
Silicon content of hot rolling raw material: 2.90%, thickness 2.2mm, target product thickness 0.35mm, hot rolling coiling temperature, pickling time, intermediate roll and work roll parameters, and corresponding rolling conditions are shown in Table 2. In Table 2, examples 2-1 to 2-5 are different groups of example 2, and comparative examples 2-1 to 2-7 are different groups of comparative example 2.
TABLE 2 Process and Rolling conditions for example 2 and comparative example 2
The different components of the embodiment 1 and the embodiment 2 simultaneously meet the requirements of pickling time, middle roll shifting quantity and L/R, the surface quality of the steel plate after cold continuous rolling is good, and the side wave control and side crack inhibition conditions are good. In the different groups of the comparative examples 1 and 2, the steel plate surface quality is poor due to the fact that the pickling time is not proper, the edge wave control is poor due to the fact that the roll shifting amount of the middle roll is not proper, and the edge crack is serious even broken due to the fact that the L/R value is not proper.
From the conditions of examples and comparative examples, the ideal quality of the cold continuous rolling edge of the high-grade non-oriented silicon steel for the driving motor of the new energy automobile can be obtained by simultaneously meeting the requirements of proper pickling time, middle roll shifting quantity and L/R.
Claims (3)
1. The method for improving the quality of the cold continuous rolling edge of the high-grade non-oriented silicon steel for the driving motor of the new energy automobile is characterized by comprising the following steps of:
the pickling time t of the hot-rolled raw material is controlled as follows:
T×Si％/600≤t≤T×Si％/300
wherein: t is the hot rolling coiling temperature, and Si% is the mass percent weight of Si in the high-grade non-oriented silicon steel;
setting the roll shifting amount of the intermediate roll of the continuous rolling mill to be 30-80 mm;
control range of the ratio L/R of the length L of the working roll body of the continuous rolling mill to the curvature radius R of the working roll surface:
-0.25≤L/R≤-0.15
wherein: the working roll is a concave roll, and R takes a negative value corresponding to the negative bending roll.
2. The method of claim 1, wherein the high grade non-oriented silicon steel has a si% of 2-4%.
3. The method of claim 1, wherein the hot rolling coiling temperature is 550-750 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310157726.5A CN116213458A (en) | 2023-02-23 | 2023-02-23 | Method for improving quality of cold continuous rolling edge of high-grade non-oriented silicon steel for driving motor of new energy automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310157726.5A CN116213458A (en) | 2023-02-23 | 2023-02-23 | Method for improving quality of cold continuous rolling edge of high-grade non-oriented silicon steel for driving motor of new energy automobile |
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| CN116213458A true CN116213458A (en) | 2023-06-06 |
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| CN202310157726.5A Pending CN116213458A (en) | 2023-02-23 | 2023-02-23 | Method for improving quality of cold continuous rolling edge of high-grade non-oriented silicon steel for driving motor of new energy automobile |
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