CN116371917A - Cold rolling method of strip steel and strip steel - Google Patents
Cold rolling method of strip steel and strip steel Download PDFInfo
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- CN116371917A CN116371917A CN202310394907.XA CN202310394907A CN116371917A CN 116371917 A CN116371917 A CN 116371917A CN 202310394907 A CN202310394907 A CN 202310394907A CN 116371917 A CN116371917 A CN 116371917A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 125
- 239000010959 steel Substances 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005097 cold rolling Methods 0.000 title claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 143
- 238000013000 roll bending Methods 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000002829 reductive effect Effects 0.000 abstract description 17
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- 229910052751 metal Inorganic materials 0.000 description 8
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- 238000000137 annealing Methods 0.000 description 7
- 230000005465 channeling Effects 0.000 description 6
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- 229910000976 Electrical steel Inorganic materials 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
- B21B1/22—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
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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
- B21B37/48—Tension control; Compression control
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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
- B21B37/58—Roll-force control; Roll-gap control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The application discloses a cold rolling method of strip steel and strip steel, wherein the cold rolling method comprises the following steps: providing strip steel to be processed; and (3) putting the strip steel to be processed into a single-stand rolling mill, wherein the target plate shape is taken as a W plate shape control single-stand rolling mill with a tiny edge wave at the edge and a tiny middle wave at the middle, and carrying out n-pass rolling on the strip steel to be processed in a reciprocating manner to obtain the strip steel, wherein n is a positive integer. According to the cold rolling method of the strip steel and the strip steel, the diagonal stripes of the strip steel rolled by the single-stand rolling mill can be effectively reduced.
Description
Technical Field
The application belongs to the technical field of steel rolling, and particularly relates to a cold rolling method of strip steel and the strip steel.
Background
After the strip steel is rolled by a cold rolling mill, oblique stripes exist in most cases, and particularly, the situation of the oblique stripes is serious for the strip steel rolled by a single-stand rolling mill. The uneven transverse tension of the strip steel at the roller gap of the single frame causes uneven longitudinal elongation of the metal of the strip steel cross section, and the interaction internal stress is generated between the longitudinal strips, so that the strip steel warp is caused when the internal stress exceeds the critical stress value of the strip steel warp. After the strip steel of the strip is warped, the tension is reduced, the tension of the adjacent strip is increased, and new warping is generated, so that the longitudinal length of the adjacent inner strip of the strip steel has an increasing or decreasing trend, and oblique stripes are generated. Serious diagonal stripe defects cannot be eliminated in subsequent procedures, and use is affected.
Disclosure of Invention
The embodiment of the application provides a cold rolling method of strip steel and the strip steel, which can effectively reduce diagonal stripes of the strip steel rolled by a single-stand rolling mill.
An embodiment of a first aspect of the present application provides a cold rolling method of a strip steel, including:
providing strip steel to be processed;
and (3) putting the strip steel to be processed into a single-stand rolling mill, wherein the target plate shape is taken as a W plate shape control single-stand rolling mill with a tiny edge wave at the edge and a tiny middle wave at the middle, and carrying out n-pass rolling on the strip steel to be processed in a reciprocating manner to obtain the strip steel, wherein n is a positive integer.
According to the embodiment of the first aspect of the application, the side waves of the W plate shape are 3I-6I, the middle waves are 8I-15I, and the gain value is 20-60.
According to any one of the foregoing embodiments of the first aspect of the present application, a W-plate shape control single stand rolling mill using a target plate shape as an edge micro-edge wave and a middle micro-center wave reciprocally performs n-pass rolling on a strip steel to be processed, including:
calculating a target roll bending value, a target roll shifting value and a target inclination amount of the working roll of the single-stand rolling mill according to the roll shape and the target plate shape of the working roll of the single-stand rolling mill;
and controlling the working rolls of the single-stand rolling mill according to the target roll bending value, the target roll shifting value and the target inclination amount.
According to any of the foregoing embodiments of the first aspect of the present application, the outlet unit tension per pass of the single stand mill is 17 to 24kg/mm 2 。
According to any of the foregoing embodiments of the first aspect of the present application, the outlet unit tension T of the ith pass rolling of the single stand mill i Outlet unit tension T greater than or equal to the (i-1) th pass of single stand mill i-1 Wherein i is a positive integer, and i is more than or equal to 2 and less than or equal to n.
According to any of the foregoing embodiments of the first aspect of the present application, the rolling force of each rolling pass of the single stand rolling mill is 6000kN to 12000kN.
According to any of the foregoing embodiments of the first aspect of the present application, the rolling force F of the i-th pass rolling of the single stand rolling mill i A rolling force F less than or equal to the (i-1) th pass rolling of the single-stand rolling mill i-1 Wherein i is a positive integer, and i is more than or equal to 2 and less than or equal to n.
According to any of the foregoing embodiments of the first aspect of the present application, the roughness of the work rolls of the single stand mill is 0.5um to 1.0um.
According to any of the foregoing embodiments of the first aspect of the present application, providing a strip to be processed includes:
providing a blank to be processed;
and (3) carrying out hot rolling and acid washing on the blank to be processed in sequence to obtain the strip steel to be processed.
An embodiment of a second aspect of the present application provides a strip steel produced by the cold rolling method of any one of the first aspect.
According to the cold rolling method of the strip steel, the strip steel to be processed is placed into a single-stand rolling mill, the target plate shape is taken as the W-plate shape control single-stand rolling mill with the small edge waves at the edge and the small middle waves at the middle, and the strip steel to be processed is rolled in n times in a reciprocating mode, so that the strip steel is obtained. The target plate shape of the strip steel is set to be a W plate shape with a tiny side wave at the edge and a tiny middle wave at the middle part, so that the transverse tension distribution of the strip steel is more uniform, and the diagonal stripes of the strip steel rolled by a single-stand rolling mill can be effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described, and it is possible for a person skilled in the art to obtain other drawings according to these drawings without inventive effort.
FIG. 1 is a schematic flow chart of a cold rolling method of strip steel according to an embodiment of the first aspect of the present application;
fig. 2 is a schematic diagram of the shape of a W-plate of a middle micro-edge wave and a middle micro-center wave of a cold rolling method of a strip steel according to an embodiment of the first aspect of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application are described in detail below to make the objects, technical solutions and advantages of the present application more apparent, and to further describe the present application in conjunction with the accompanying drawings and the detailed embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative of the application and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing examples thereof, and in the drawings and the following description, at least some well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present application; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In this context, unless otherwise indicated, the meaning of "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like indicate an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Moreover, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The directional terms appearing in the following description are all directions shown in the drawings and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected. It will be understood that when a layer, an area, or a structure is described as being "on" or "over" another layer, another area, it can be referred to as being directly on the other layer, another area, or another layer or area can be included between the layer and the other layer, another area. And if the component is turned over, that layer, one region, will be "under" or "beneath" the other layer, another region. The specific meaning of the terms in the present application can be understood as appropriate by one of ordinary skill in the art.
After the strip steel is rolled by a cold rolling mill, oblique stripes exist in most cases, and particularly, the situation of the oblique stripes is serious for the strip steel rolled by a single-stand rolling mill. The uneven transverse tension of the strip steel at the roller gap of the single frame causes uneven longitudinal elongation of the metal of the strip steel cross section, and the interaction internal stress is generated between the longitudinal strips, so that the strip steel warp is caused when the internal stress exceeds the critical stress value of the strip steel warp. After the strip steel of the strip is warped, the tension is reduced, the tension of the adjacent strip is increased, and new warping is generated, so that the longitudinal length of the adjacent inner strip of the strip steel has an increasing or decreasing trend, and oblique stripes are generated. Serious diagonal stripe defects cannot be eliminated in subsequent procedures, and use is affected.
In order to solve the problems, the embodiment of the application provides a cold rolling method of strip steel and the strip steel. Embodiments of the present application will be described below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of a first aspect of the present application provides a cold rolling method of a strip steel, including:
s1, providing strip steel to be processed;
s2, placing the strip steel to be processed into a single-stand rolling mill, controlling the single-stand rolling mill to reciprocate n times by taking the target plate shape as the side micro-edge wave and the middle micro-center wave, and preparing the strip steel, wherein n is a positive integer.
Wherein, compared with a cold continuous rolling mill, the single-stand rolling mill has only one unit, and the rolling direction is reversible. The single-frame rolling mill has small occupied area, small investment, smaller roller diameter of the working roller and higher rolling precision. Optionally, an eighteen-roller single-stand rolling mill is adopted for rolling, and the roller diameter of a working roller of the eighteen-roller single-stand rolling mill is 140-170 mm. The single-stand rolling mill is used for rolling repeatedly through reciprocating multiple times, and by way of example, the first-pass rolled strip steel moves along the first direction, then the second-pass rolled strip steel moves along the direction opposite to the first direction, the third-pass rolled strip steel rolls along the first direction again, and the like, so that the reciprocating multiple times of rolling are completed. The shape of the strip, i.e., the degree of warpage of the strip, is essentially the residual stress distribution inside the strip.
Referring to fig. 2, fig. 2 is a schematic diagram of a W-shape of a slight side wave and a slight middle wave, wherein the abscissa indicates the width D of the strip steel and the ordinate indicates the I-value of the shape. The W-shaped curve is a shape curve with a slight side wave at the side and a slight middle wave at the middle. When the edge is double-sided wave, the transverse tension of the strip steel is distributed more uniformly, and the oblique stripes can be effectively lightened. The middle part has certain middle waves, the extension of the middle part is larger than that of the side parts, and the small extension of the side parts is beneficial to improving the transverse common-plate difference. The W-shaped plate can realize double-side wave rolling, ensure certain middle waves and improve the same plate difference.
According to the cold rolling method of the strip steel, the strip steel to be processed is placed into a single-stand rolling mill, the target plate shape is taken as the W-plate shape control single-stand rolling mill with the small edge waves at the edge and the small middle waves at the middle, and the strip steel to be processed is rolled in n times in a reciprocating mode, so that the strip steel is obtained. The target plate shape of the strip steel is set to be a W plate shape with a tiny side wave at the edge and a tiny middle wave at the middle part, so that the transverse tension distribution of the strip steel is more uniform, and the diagonal stripes of the strip steel rolled by a single-stand rolling mill can be effectively reduced.
In some alternative embodiments, the side waves of the W plate shape are 3I-6I, the middle waves are 8I-15I, and the gain value is 20-60.
Wherein the plate shape i= (Δl/L) ×10 5 I is the shape of strip steel and is expressed by I units; Δl is the longitudinal extension difference of the strip steel in mm; l is the datum point of the strip steelThe unit of the strip steel length is mm. The gain value reflects the severity of the plate bend.
In the alternative embodiments, the side waves of the W plate shape are set to be 3I-6I, the middle waves are set to be 8I-15I, and the gain value is set to be 20-60, so that the diagonal stripes of the strip steel can be better lightened.
In some alternative embodiments, S2 comprises:
s201, calculating a target roll bending value, a target roll shifting value and a target inclination amount of the working roll of the single-stand rolling mill according to the roll shape and the target plate shape of the working roll of the single-stand rolling mill;
s202, controlling working rolls of the single-stand rolling mill according to the target roll bending value, the target roll shifting value and the target inclination amount.
Optionally, a middle roller single side of the working roller of the single-frame rolling mill adopts a two-section taper roller shape with different slopes. The roll shape is beneficial to reducing the side part depression of the strip steel, and simultaneously the side part extension is also reduced, so that the middle wave is easier to generate.
The roll shifting value is the movement amount of the working roll along the axial direction of the working roll, the roll shifting of the working roll can adjust the plate shape to a certain extent, the working roll can be uniformly worn, and the excessive deflection of the working roll is reduced. The channeling of the working rolls is divided into positive channeling and negative channeling, wherein positive channeling means that the upper working roll moves towards the driving side and the lower working roll moves towards the operating side, so that the bending degree of the working rolls is increased, and the edge waves can be effectively reduced; the negative channeling means that the upper work roll moves toward the operation side and the lower work roll moves toward the driving side, so that the bending degree of the roll is reduced and the possibility of edge wave generation is increased. The bending value is the bending amount of the working roll, and the bending roll can ensure the flatness of the strip steel and can influence the shape of the strip steel. The bending rollers are divided into positive bending and negative bending, wherein the positive bending is that an upper working roller increases bending force upwards, a lower working roller increases bending force downwards, the bending degree of the working roller is increased, the rolling force is reduced, the thickness of the middle part of the strip steel can be reduced, and the thickness of the edge part is relatively increased; the negative bending is that the upper working roll increases the bending force downwards, the lower working roll increases the bending force upwards, the bending degree of the working roll is reduced, the rolling force is increased, the thickness of the middle part of the strip steel can be increased, and the thickness of the edge part is relatively reduced. The amount of inclination of the work rolls can also affect the strip shape to some extent. The bending value and the channeling value of the working roller can be driven by the oil cylinder.
In these alternative embodiments, the target roll bending value, the target roll running value and the target tilting amount are calculated according to the roll shape of the working rolls of the single-stand rolling mill and the target strip shape of the strip steel during rolling, and the working rolls of the single-stand rolling mill are controlled according to the target roll bending value, the target roll running value and the target tilting amount to complete rolling, so that the strip shape is controlled better, and the diagonal stripes are reduced.
In some alternative embodiments, the outlet unit tension per pass of the single stand mill is 17-24 kg/mm 2 . The increase of outlet unit tension in the rolling process is beneficial to improving the longitudinal extension of the strip steel in the rolling process, on the other hand, the rolling force can be reduced, the fixed clamping effect of the working rolls at the roll gap on the strip steel and the limitation of the transverse deformation of the strip steel metal at the roll gap are weakened, and the inclined stripes are further weakened and eliminated. However, the outlet unit tension is too large, and the strip steel is not easy to be too large because of the risk of edge cracking or strip breakage. In this embodiment, the outlet unit tension of each pass of the single stand mill is set to be 17-24 kg/mm 2 The method ensures that the strip steel does not generate edge crack or breakage, and can effectively reduce diagonal stripes of the strip steel.
It should be understood that the outlet of the stand-alone mill is the last outlet of the strip to be processed. Since the rolling of the strip to be processed by the single-stand rolling mill is a reciprocating rolling, the inlet and outlet of the single-stand rolling mill are opposite. The single-stand rolling mill comprises a first port and a second port, wherein the first-pass rolling strip steel to be processed moves along the direction from the first port to the second port, so that the first port is an inlet of the single-stand rolling mill, the second port is an outlet of the single-stand rolling mill, the second-pass rolling strip steel to be processed moves along the direction from the second port to the first port, so that the second port is an inlet of the single-stand rolling mill, and the first port is an outlet of the single-stand rolling mill.
In some alternative embodiments, the outlet unit tension T of the ith pass of the single stand mill i Outlet unit tension T greater than or equal to the (i-1) th pass of single stand mill i-1 Wherein, the method comprises the steps of, wherein,i is a positive integer, i is more than or equal to 2 and less than or equal to n.
In these alternative embodiments, the greater the strength of the strip, the greater the unit tension at the outlet of the stand-alone mill, which is more conducive to extending the Daishan strip in the longitudinal direction of the roll, thereby reducing the diagonal streaks of the strip.
In some alternative embodiments, the rolling force of each pass of the single stand mill is between 6000kN and 12000kN.
In these alternative embodiments, the single stand rolling mill rolls the strip steel with a rolling force of 6000 kN-12000 kN, which is reduced by 20% -35% compared with the cold continuous rolling mill, and can weaken the fixed clamping effect of the working rolls at the roll gap on the strip steel and the limitation of the transverse deformation of the strip steel metal at the roll gap, thereby weakening and eliminating the oblique stripes.
In some alternative embodiments, the rolling force F of the ith pass of the single stand mill i A rolling force F less than or equal to the (i-1) th pass rolling of the single-stand rolling mill i-1 Wherein i is a positive integer, and i is more than or equal to 2 and less than or equal to n. With the increase of rolling passes, the reduction ratio of the single-frame rolling mill gradually decreases, but the deformation resistance also increases, and the rolling force of each rolling pass is smaller than or equal to that of the previous rolling pass from the second rolling pass, so that the reduction and elimination of the inclined stripes are more beneficial.
In some alternative embodiments, the roughness of the work rolls of the single stand mill is 0.5um to 1.0um. The smaller the surface roughness of the working roller is, the higher the surface finish is, and the smaller the friction coefficient of the working roller and the strip steel is in the contact area of the working roller and the strip steel during rolling, which is more beneficial to the transverse flow of the metal in the roll gap, and can improve the problem of uneven longitudinal elongation of the metal of the cross section of the strip steel, thereby improving the inclined stripes. However, the roughness of the working rolls is too small, which easily causes slippage of the strip steel during rolling.
In these alternative embodiments, the surface roughness of the work rolls is 0.5um to 1.0um, which not only ensures the strip steel to slip during rolling, but also facilitates the metal in the roll gap to flow transversely, thereby reducing or eliminating the diagonal stripes.
In some alternative embodiments, S1 comprises:
s101, providing a blank to be processed;
s102, hot rolling and acid washing are sequentially carried out on the blank to be processed to obtain the strip steel to be processed.
The blank to be processed can be a cast blank, and is heated by a heating furnace and then hot rolled, so that the processing performance of metals and alloys can be improved by hot rolling, namely, coarse grains in a casting state are crushed, remarkable crack healing is achieved, casting defects are reduced or eliminated, an as-cast structure is converted into a deformed structure, and the processing performance of alloys is improved. The surface of the plate blank after hot rolling has oxide scales, so that the plate blank is placed in a pickling tank for pickling to remove the oxide scales on the surface, and the surface quality of the strip steel obtained after rolling is improved.
In some alternative embodiments, the cold rolling method further comprises:
s3, continuous annealing and leveling treatment. The continuous annealing is a production mode that the strip steel continuously passes through an annealing furnace and is directly coiled without staying. The continuous annealing can eliminate work hardening and residual internal stress, and obtain the structure and performance meeting the requirements of customer processing. The flattening treatment can further eliminate light slight oblique streaks generated after rolling.
To further illustrate the cold rolling method provided in the examples of the present application, the following examples and comparative examples are set forth.
Example 1:
providing a steel strip to be processed of oriented silicon steel of grade A, wherein the thickness of the steel strip to be processed is 0.6mm, the width of the steel strip to be processed is 1080mm, placing the steel strip to be processed into a single-stand rolling mill, and controlling the single-stand rolling mill to reciprocate 5 times by using a W plate shape with a target plate shape as a side micro-edge wave and a middle micro-middle wave, wherein the side wave of the W plate shape is 8I, the middle wave is 10I, and the gain value is 30. The outlet unit tension of the first-pass rolling single-frame rolling mill is 17kg/mm 2 The outlet unit tension of the second pass rolling single frame rolling mill is 19kg/mm 2 The outlet unit tension of the third rolling single-frame rolling mill is 20kg/mm 2 The outlet unit tension of the fourth pass rolling single frame rolling mill is 21kg/mm 2 Fifth pass rolling single machineOutlet unit tension of the frame rolling mill is 22kg/mm 2 . The surface roughness of the work rolls of the single stand mill was 0.9um.
After rolling by a single-stand rolling mill, the oblique streaks of the strip steel are slightly observed visually, have no hand feeling, and can be eliminated after continuous annealing and flattening treatment.
Example 2:
providing a B-grade medium-high carbon steel strip to be processed, wherein the thickness of the steel strip to be processed is 1.2mm, the width of the steel strip to be processed is 1250mm, placing the steel strip to be processed into a single-stand rolling mill, and controlling the single-stand rolling mill to reciprocate the steel strip to be processed by a W-shape control single-stand rolling mill with a target shape of a small edge wave at the edge part and a small middle wave at the middle part, wherein the edge wave of the W-shape is 5I, the middle wave is 15I, and the gain value is 40. The outlet unit tension of the first-pass rolling single-frame rolling mill is 21kg/mm 2 The outlet unit tension of the second pass rolling single frame rolling mill is 22kg/mm 2 The outlet unit tension of the third rolling single-frame rolling mill is 23kg/mm 2 . The surface roughness of the work rolls of the single stand mill was 0.7um.
After rolling by a single-stand rolling mill, the oblique streaks of the strip steel are slightly observed visually, have no hand feeling, and can be eliminated after continuous annealing and flattening treatment.
Comparative example 1:
providing a C-grade medium-high carbon steel strip to be processed, wherein the thickness of the steel strip to be processed is 1.0mm, the width of the steel strip to be processed is 1280mm, placing the steel strip to be processed into a single-stand rolling mill, and controlling the single-stand rolling mill to reciprocate the steel strip to be processed by taking a target plate shape as a micro-medium wave plate shape for 3 times of rolling, wherein the medium wave of the plate shape is 18I. The outlet unit tension of the first-pass rolling single-frame rolling mill is 13kg/mm 2 The outlet unit tension of the second pass rolling single frame rolling mill is 14kg/mm 2 The outlet unit tension of the third rolling single-frame rolling mill is 15kg/mm 2 . The surface roughness of the work rolls of the single stand mill was 1.0um.
In the comparative example, the target plate shape is not W-shaped with a slight edge wave at the edge and a slight center wave at the middle, and the unit tension of the outlet is less than 17kg/mm 2 . After rolling by a single-frame rolling mill, the oblique streaks of the strip steel are obvious in visual inspection and have strong hand feeling,and cannot be eliminated after continuous annealing and leveling treatment.
As can be seen from the two embodiments and one comparative example, the cold rolling method provided by the embodiment of the application can effectively reduce or eliminate the diagonal stripes.
An embodiment of a second aspect of the present application provides a strip steel produced by the cold rolling method of any one of the first aspect. Optionally, the thickness of the strip steel is 0.3 mm-2.5 mm, and the width is 900 mm-1450 mm.
These examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and claimed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various modifications as are suited to the particular use contemplated. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, which are intended to be included in the scope of the present application.
Claims (10)
1. A cold rolling method of strip steel, applied to a Shan Jijia rolling mill, comprising:
providing strip steel to be processed;
and placing the strip steel to be processed into a single-stand rolling mill, controlling the single-stand rolling mill to perform n-pass rolling on the strip steel to be processed by taking the target plate shape as the W plate shape of the micro-edge wave at the edge and the micro-center wave at the middle, and preparing the strip steel, wherein n is a positive integer.
2. The cold rolling method according to claim 1, wherein the side waves of the W plate shape are 3I to 6I, the middle waves are 8I to 15I, and the gain value is 20 to 60.
3. The cold rolling method according to claim 2, wherein the W-shape with the target shape as the side micro-edge wave and the middle micro-center wave controls the single-stand rolling mill to reciprocate the strip steel to be processed for n-pass rolling, comprising:
calculating a target roll bending value, a target roll shifting value and a target inclination amount of the working roll of the single-stand rolling mill according to the roll shape and the target plate shape of the working roll of the single-stand rolling mill;
and controlling the working rolls of the single-frame rolling mill according to the target roll bending value, the target roll shifting value and the target inclination amount.
4. The cold rolling method according to claim 1, wherein the outlet unit tension per pass of the single stand mill is 17-24 kg/mm 2 。
5. The cold rolling method according to claim 4, wherein the outlet unit tension T of the i-th pass rolling of the single stand mill i The outlet unit tension T of the i-1 th pass rolling of the single-frame rolling mill is greater than or equal to i-1 Wherein i is a positive integer, and i is more than or equal to 2 and less than or equal to n.
6. The cold rolling method according to claim 1, wherein the rolling force per one pass of the single stand mill is 6000kN to 12000kN.
7. The cold rolling method according to claim 6, wherein the rolling force F of the i-th pass rolling of the single stand mill i A rolling force F less than or equal to the i-1 th pass rolling of the single-stand rolling mill i-1 Wherein i is a positive integer, and i is more than or equal to 2 and less than or equal to n.
8. The cold rolling method according to claim 1, wherein the roughness of the work rolls of the single stand mill is 0.5um to 1.0um.
9. The cold rolling method according to claim 1, wherein the providing the strip steel to be processed comprises:
providing a blank to be processed;
and carrying out hot rolling and acid washing on the blank to be processed in sequence to obtain the strip steel to be processed.
10. A strip steel produced by the cold rolling process of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310394907.XA CN116371917A (en) | 2023-04-13 | 2023-04-13 | Cold rolling method of strip steel and strip steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310394907.XA CN116371917A (en) | 2023-04-13 | 2023-04-13 | Cold rolling method of strip steel and strip steel |
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| Publication Number | Publication Date |
|---|---|
| CN116371917A true CN116371917A (en) | 2023-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310394907.XA Pending CN116371917A (en) | 2023-04-13 | 2023-04-13 | Cold rolling method of strip steel and strip steel |
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| Country | Link |
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| CN (1) | CN116371917A (en) |
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- 2023-04-13 CN CN202310394907.XA patent/CN116371917A/en active Pending
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