CN112058917B - Method and device for controlling bright band and wave shape on surface of low-carbon mild steel - Google Patents
Method and device for controlling bright band and wave shape on surface of low-carbon mild steel Download PDFInfo
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- CN112058917B CN112058917B CN202010696211.9A CN202010696211A CN112058917B CN 112058917 B CN112058917 B CN 112058917B CN 202010696211 A CN202010696211 A CN 202010696211A CN 112058917 B CN112058917 B CN 112058917B
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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
- 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
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/04—Flatness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/02—Tension
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Abstract
The invention discloses a method for controlling bright bands and wave shapes on the surface of low-carbon mild steel, which comprises the following steps: controlling the convexity of the strip steel to be C in the strip steel finish rolling stage 40 Less than or equal to 30 mu m; and in the strip steel coiling stage, the coiling unit tension is controlled to be 20-30 MPa when the strip steel is stably coiled, wherein the roll profile curve of the coiling roll system device used in the strip steel coiling stage is a quadratic parabolic curve. The method reduces the incidence rate of the low-carbon mild steel bright band, reduces the defect of the bright band accompanying medium waves, and reduces the loss caused by cutting loss and repeated leveling of the steel coil. Meanwhile, the invention also discloses a control device for the bright band and the wave shape on the surface of the low-carbon mild steel and a computer readable storage medium.
Description
Technical Field
The invention relates to the technical field of hot-rolled strip steel manufacturing, in particular to a method and a device for controlling bright bands and wave shapes on the surface of low-carbon mild steel.
Background
The surface quality and the plate shape quality of the hot-rolled strip steel are important indexes for measuring the product quality, and the hot-rolled strip steel also has very important influence on the finished product quality of downstream processes and the production process. In the production process of the hot-rolled low-carbon mild steel, bright strips and additional wave-shaped defects are easy to appear on the surface of the strip steel, as shown in figure 1. Such defects are particularly serious when the thickness of the product is thin (less than or equal to 1.4 mm). The serious bright band and the accompanying additional wave-shaped defects 2 cause large cutting loss, lead to high rework rate of the flattening process and bring very large economic loss.
Disclosure of Invention
The embodiment of the application provides a method and a device for controlling bright bands and wave shapes on the surface of low-carbon mild steel, solves the technical problem that the bright bands and the additional wave shapes are easy to appear on the surface of strip steel in the production process of the low-carbon mild steel in the prior art, realizes the reduction of the incidence rate of the bright bands of the low-carbon mild steel, eliminates or reduces the defect of the additional wave shapes, and reduces the technical effects of loss caused by cutting loss and repeated leveling of a steel coil.
In a first aspect, the present application provides the following technical solutions through an embodiment of the present application:
a method for controlling bright bands and wave shapes on the surface of low-carbon mild steel comprises the following steps:
in the finish rolling stage of the strip steel, the convexity of the strip steel is controlled to be C 40 ≤30μm；
And in the strip steel coiling stage, the coiling unit tension is controlled to be 20-30 MPa when the strip steel is stably coiled, wherein the roll profile curve of the coiling roll system device used in the strip steel coiling stage is a quadratic parabolic curve.
Preferably, the take-up roller system device includes:
coiling a pinch roll;
a winding auxiliary roller is wound;
a lifting table carrier roller of the coil stripping trolley;
quality control sample station ground roller.
Preferably, the original convexity of the roll body of the coiling pinch roll is-30 +/-3 mu m; the original convexity of the roller body of the coiling wrapper roller is-30 +/-3 mu m; the original convexity of the roller body of the supporting roller group of the lifting platform of the coil stripping trolley is-5000 +/-50 mu m; the original convexity of the roller body of the quality inspection sampling station ground roller set is-5000 +/-50 mu m.
Preferably, after the controlling the coiling unit tension at the time of stably coiling the strip steel to be 20 to 30MPa, the method further comprises the following steps:
controlling the pressure of the coiling pinch roll to be less than or equal to 30KN;
controlling the pressure of the coiling wrapper roll to be less than or equal to 120KN;
and controlling the pressure of the supporting roller of the lifting platform of the coil stripping trolley to be less than or equal to 100bar.
Preferably, the controlling the pressure of the take-up pinch roll to 30KN or less includes:
and controlling the pressure of the coiling pinch roll to be less than or equal to 20KN.
Preferably, after the steel coil is supported by the supporting roller of the coil stripping trolley lifting platform, the number of turns of the steel coil before coil stripping is controlled to be less than or equal to 0.5 turn.
Based on the same inventive concept, in a second aspect, the present application provides the following technical solutions through an embodiment of the present application:
a control device for bright bands and wave shapes on the surface of low-carbon mild steel comprises:
a first control unit for controlling the convexity of the strip steel at C in the strip steel finish rolling stage 40 ≤30μm；
And the second control unit is used for controlling the coiling unit tension to be 20-30 MPa when the strip steel is stably coiled in the strip steel coiling stage, wherein the roll profile curve of the coiling roll system device used in the strip steel coiling stage is a quadratic parabolic curve.
Preferably, the control device further includes:
and the third control unit is used for controlling the pressure of the reeling pinch roll to be less than or equal to 30KN, controlling the pressure of the reeling auxiliary roll to be less than or equal to 120KN and controlling the pressure of the coil stripping trolley lifting platform to be less than or equal to 100bar after the reeling unit tension is controlled to be between 20 and 30MPa when the strip steel is stably reeled.
Based on the same inventive concept, in a third aspect, the present application provides the following technical solutions through an embodiment of the present application:
a control device for bright bands and wave shapes on the surface of low-carbon mild steel comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor can realize the method steps of any one of the embodiments of the first aspect when executing the program.
Based on the same inventive concept, in a fourth aspect, the present application provides the following technical solutions through an embodiment of the present application:
a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, is adapted to carry out the method steps of any of the embodiments of the first aspect.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
in the embodiment of the application, a method for controlling the bright band and the wave shape on the surface of the low-carbon mild steel is disclosed, which comprises the following steps: controlling the convexity of the strip steel to be C in the strip steel finish rolling stage 40 Less than or equal to 30 mu m; and in the strip steel coiling stage, the coiling unit tension is controlled to be 20-30 MPa when the strip steel is stably coiled, wherein the roll profile curve of a coiling roll system device used in the strip steel coiling stage is a quadratic parabola curve. Because the strip steel convexity is optimized at the strip steel finish rolling stage, the roller type of the coiling roller system is optimized to increase the contact area of the strip steel and the roller system, and then the equivalent stress of the contact of the strip steel and the roller system is smaller than the yield strength of the strip steel through the pressure optimization of the coiling roller system, the occurrence rate of low-carbon soft steel bright strips is reduced, the additional wave-shaped defect is eliminated or lightened, and the technical effects of reducing the loss caused by the cutting loss and the repeated leveling of the steel coil are achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic view of a bright band and an additional wave defect on the surface of mild low-carbon steel in an embodiment of the present application;
FIG. 2 is a flowchart illustrating a method for controlling bright bands and waves on the surface of mild low-carbon steel according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a hot rolled low carbon mild steel production process based on a CSP process in an example of the present application;
FIG. 4 is a schematic view showing a part of contact between a parabolic section of a strip steel and pinch rolls in an embodiment of the present application;
FIGS. 5, 6 and 7 are schematic diagrams illustrating the mechanism for forming the bright band and the additional wavy defect on the surface of the mild low carbon steel in the embodiment of the present application; wherein, fig. 5 is a forming mechanism 1, and fig. 6-7 are forming mechanisms 2;
FIG. 8 is a schematic diagram of the analysis of the stress of the strip steel at the pinch rolls when the strip steel is coiled in the embodiment of the application;
FIG. 9 is a schematic view illustrating an analysis of a contact stress between a carrier roller and a steel coil during the coil unloading of the steel coil in the embodiment of the present application;
FIG. 10 is a structural diagram of a control device for controlling the bright band and wave shape on the surface of mild low-carbon steel in the embodiment of the present application.
Description of reference numerals: the device comprises a bright strip 1, an additional wavy defect 2, a bulge 3, a steel coil 4, a CSP continuous casting machine 5, a soaking pit 6, a descaling box 7, a finishing mill 8, laminar cooling 9, pinch rolls 10, upper pinch rolls 101, lower pinch rolls 102, a coiler drum 11, auxiliary coiling rolls 12, a coil stripping trolley 13, a coil stripping trolley lifting table 131, a lifting table carrier roller 132, a quality inspection sampling table ground roll 14, a quality inspection sampling table 15, a leveling machine 16 and strip steel 17.
Detailed Description
The embodiment of the application provides a method and a device for controlling bright bands and wave shapes on the surface of low-carbon mild steel, solves the technical problem that in the prior art, in the production process of the low-carbon mild steel, bright bands and additional wave shapes of the steel easily appear on the surface of strip steel, realizes reduction of the incidence rate of the bright bands of the low-carbon mild steel, eliminates or reduces the defect of the additional wave shapes, and reduces the technical effects of loss caused by cutting loss and repeated leveling of a steel coil.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a method for controlling bright bands and wave shapes on the surface of low-carbon mild steel comprises the following steps: in the finish rolling stage of the strip steel, the convexity of the strip steel is controlled to be C 40 Less than or equal to 30 mu m; and in the strip steel coiling stage, the coiling unit tension is controlled to be 20-30 MPa when the strip steel is stably coiled, wherein the roll profile curve of the coiling roll system device used in the strip steel coiling stage is a quadratic parabolic curve. Because the strip steel convexity is optimized at the strip steel finish rolling stage, the roller shape of a coiling roller system is optimized to increase the contact area of the strip steel and a roller system, and then the pressure optimization of the coiling roller system enables the equivalent stress of the contact of the strip steel and the roller system to be smaller than the yield strength of the strip steel, the occurrence rate of low-carbon soft steel bright strips is reduced, the additional wave-shaped defect is eliminated or lightened, the cutting loss of a steel coil and the repeated leveling and flattening of the strip steel are reducedThe technical effect of the loss brought.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example one
As shown in fig. 2, the present embodiment provides a method for controlling a bright band and a wave shape on a surface of mild low-carbon steel, including:
step S101: controlling the convexity of the strip steel to be C in the strip steel finish rolling stage 40 ≤30μm；
Step S102: and in the strip steel coiling stage, the coiling unit tension is controlled to be 20-30 MPa when the strip steel is stably coiled, wherein the roll profile curve of a coiling roll system device used in the strip steel coiling stage is a quadratic parabolic curve.
In the specific implementation process, the method is mainly used for solving the problems of bright strips and additional wave-shaped defects generated on the surface of the steel coil in the production process of the low-carbon mild steel, wherein the low-carbon mild steel comprises the following chemical components in percentage by weight: 0.01-0.06%, si is less than or equal to 0.03%, mn:0.1 to 0.5 percent; less than or equal to 0.03 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.008 percent of N, 0.02 to 0.06 percent of Als, 0.0008 to 0.0025 percent of B, and the balance of Fe and inevitable impurities. And the low-carbon mild steel is thin hot-rolled strip steel, and the thickness specification of the low-carbon mild steel is less than or equal to 2.0mm.
In the specific implementation process, in the strip steel coiling stage, the coiling unit tension Tu needs to be controlled to be 20-30 MPa, namely Tu = 20-30 MPa when the strip steel is stably coiled.
Further, the take-up roll system device includes:
a reeling pinch roll (a pinch roll for short), a reeling auxiliary roll (a winding-assistant roll for short), a coil stripping trolley lifting platform carrier roller and a quality inspection sampling station ground roller.
In the specific implementation process, the roll profile curves of the coiling pinch roll, the coiling wrapper roll, the coil stripping trolley lifting platform carrier roller and the quality inspection sampling station ground roller are required to be controlled to be quadratic parabolic curves.
Further, the original convexity of the roll body of the coiling pinch roll is-30 +/-3 mu m; the original convexity of the roller body of the coiling wrapper roller is-30 +/-3 mu m; the original convexity of the roller body of the lifting table carrier roller group of the coil stripping trolley is-5000 +/-50 mu m; the original convexity of the roller body of the quality inspection sampling station ground roller set is-5000 +/-50 mu m.
Further, the method for controlling the coiling unit tension at 20-30 MPa when the strip steel is stably coiled comprises the following steps:
controlling pressure P of take-up pinch roll PR Less than or equal to 30KN, and controlling the pressure P of the winding auxiliary roller WR Less than or equal to 120KN, and controls the pressure P of the lifting platform carrier roller of the coil stripping trolley SC ≤100bar。
Preferably, the pressure P of the take-up pinch roll is controlled PR Controlling the pressure P of the winding auxiliary roller to be less than or equal to 20KN WR Less than or equal to 120KN, and controls the pressure P of the lifting platform carrier roller of the coil stripping trolley SC ≤100bar。
Further, after the steel coil is supported by a carrier roller of the lifting platform of the coil stripping trolley, the rotating number of turns of the steel coil before coil stripping is controlled to be less than or equal to 0.5 turn.
Hereinafter, the technical principle and reason for adopting the above-described control method will be described in detail.
The main production flow of the hot-rolled low-carbon mild steel comprises the following steps: slab continuous casting → heating → (rough rolling) → finish rolling → laminar cooling → coiling → leveling and warehousing. After a part of steel coils are placed on a lower coiling machine, sampling and surface inspection operations are required to be carried out on a sampling station due to quality inspection requirements.
As shown in fig. 3, fig. 3 is a schematic view of a hot-rolled low-carbon mild steel Production process based on a CSP (Compact Strip Production) process.
During coiling, the pinch roll 10 pre-bends the strip head to guide the strip to the coiler drum 11 and simultaneously clamps the strip to form stable tension between the pinch roll 10 and the coiler drum 11. When the head of the strip steel enters the coiling machine and the tail of the strip steel leaves the pinch roll 10, the auxiliary coiling roll 12 is pressed down to assist coiling. When the tail of the steel coil is about to enter the pinch roll 10, the coil unloading trolley lifting platform 131 slowly rises, the coil unloading trolley lifting platform carrier roller 132 supports the steel coil 4 with set pressure, and the steel coil 4 slowly rotates under the action of the coil unloading trolley lifting platform carrier roller 132, so that the tail of the steel coil is positioned at the bottom of the steel coil 4. When the steel coil is sampled at the quality inspection sampling station, the steel coil is slowly and reversely rotated to be uncoiled under the action of the ground roller 14 of the quality inspection sampling platform, and sampling operation is carried out under the action of the sampling shears.
Based on the coiling process and the sampling process during the production of the strip steel, two mechanisms for forming bright strips and additional wave-shaped defects on the surface of the low-carbon mild steel can be provided:
the first mechanism is: as shown in fig. 4-5, based on the production principle of hot rolled strip, the section of the strip is convex (i.e. thick in the middle and thin at both sides), and when there is a local high point in the middle of the strip, the thickness unevenness is more remarkable. When the strip steel enters between the upper pinch roll 101 and the lower pinch roll 102 and between the wrapper roll 12 and the winding drum, the middle area of the width of the strip steel is firstly contacted with the pinch roll 10 and the wrapper roll 12 to form a local line contact state. Under the action of local stress formed by the combined force of the rolling system pressure and the coiling tension, the middle contact area can be plastically flattened and longitudinally extended. According to the theory of plate shape and straightness, additional extension of the contact area forms middle waves, and the severity of the middle waves is positively correlated with the rolling reduction of the line contact area; meanwhile, the relative friction between the strip steel and the roller system forms a bright band; the associated defect sites may bulge due to additive effects.
The second mechanism is: as shown in fig. 6 to 7, the rotation of the steel coil at the final winding stage and the sampling stage of the quality inspection sampling stage 15 are accompanied by the rotation of the steel coil. Meanwhile, when the coil stripping trolley rotates, great pressure exists between the lifting platform carrier roller 132 of the coil stripping trolley, the quality inspection sampling platform ground roller 12 and the steel coil. Similarly, the middle area of the strip width will contact with the roll systems of the lifting table carrier roller 132, the sampling table ground roller 12 and the like of the coil stripping trolley first, and a local line contact state is formed. Under the action of local stress formed by the combined force of the rolling system pressure and the winding tension, a bright strip 1, an additional wave shape 2 and a bulge similar to the first mechanism are formed.
The two mechanisms can be sequentially generated according to the working procedures of the strip steel under the actual working condition to form a superposition state, so that the bright band and the additional wave are more serious. If the contact lines of different rollers of the winding roller system and the strip steel are inconsistent, a plurality of bright strips can be formed.
In the two mechanisms, the bright strip 1 and the additional wave-shaped defects 2 on the surface of the mild low-carbon steel are related to the stress concentration formed by the local line contact of the roll system and the section of the strip steel. Therefore, the contact state of the roller system and the strip steel is improved, and the contact stress concentration of the strip steel and the roller system is reduced, so that bright strips and additional wave defects are improved.
As shown in FIG. 8, at the stage of stable coiling of the strip, the strip is subjected to pinch roll pressure P in the thickness direction PR Is longitudinally under the action of tension T between the rolling mill and the coiler. Because the middle part of the section of the strip steel has convexity, when the strip steel enters the pinch roll, the bulge part in the middle part of the strip steel is firstly contacted with the pinch roll. Therefore, the plane comprehensive stress K of the strip steel in the contact area is as follows: k = P PR /dL p + T/bh. Wherein b is the width of the strip steel, d is the width of the initial contact area of the pinch roll and the strip steel, and L p The longitudinal contact length of the pinch roll and the strip steel is h, and the thickness of the strip steel is h. When K exceeds the yield limit σ s of the strip (i.e., K = P/dL) p When + T/bh is larger than or equal to σ s), the contact part is plastically flattened, so that the bright belt is excessively extended to form a wave shape, and the bright belt and the pinch roll slide relatively in a friction manner to form the bright belt.
The mutual contact between the wrapper roll and the strip steel is similar to the contact between the pinch roll and the strip steel.
The contact mechanism of the coil stripping trolley carrier roller and the quality inspection sampling station ground roller with the strip steel is similar. As shown in FIG. 9, taking the contact between the idler of the coil stripper car and the strip steel as an example, after the coiling is finished, the idler of the coil stripper car is under the pressure P SC The steel coil is pushed against the steel coil, the coiling mandrel drives the steel coil to rotate, and the strip steel is subjected to the friction force f of the carrier roller. Because the middle part of the section of the strip steel has convexity, the bulge part in the middle part of the strip steel is in line contact with the carrier roller. Therefore, the plane comprehensive stress K of the strip steel in the contact area is as follows: k = Psc/dL p +f/dL p . Wherein d is the width of the initial contact area of the carrier roller and the strip steel, L p The longitudinal contact length of the carrier roller and the strip steel, and h is the thickness of the strip steel. When K exceeds the yield limit of the strip (i.e., K = Psc/dL) p +f/dL p And σ s) or more, the contact part is plastically flattened, so that the bright belt is excessively extended to form a wave shape and slides in a friction manner relative to the carrier roller to form the bright belt.
According to the analysis result, the width d of the initial contact area of the strip steel and the roller system is increased, and the pressure P and the tension T applied to the strip steel are reduced, so that the plane comprehensive stress K of the strip steel in the contact area can be reduced, and the defect is avoided or the defect degree is reduced.
The increase of the initial contact area width d is achieved by: controlling the convexity of the hot-rolled strip to be C in the hot-rolling stage 40 Less than or equal to 30 mu m; in addition, the original convexity of the roll body of the coiling pinch roll is-30 +/-3 mu m; the original convexity of the roller body of the coiling wrapper roller is-30 +/-3 mu m; the original convexity of the roller body of the lifting table carrier roller group of the coil stripping trolley is-5000 +/-50 mu m; the original convexity of the roller body of the quality inspection sampling station ground roller set is-5000 +/-50 mu m, and the roller type curves of the coiling pinch roller, the coiling wrapper roller, the coil stripping trolley lifting platform carrier roller and the quality inspection sampling station ground roller are controlled to be quadratic parabolic curves.
The pressure P and the tension T exerted on the strip steel are reduced by the following modes: in the stage of pinch roll and tension control, the tension of a coiling unit is controlled to be Tu = 20-30 MPa when strip steel is stably coiled, and the pinch roll is controlled to be P PR Less than or equal to 30KN; preferably, P PR Less than or equal to 20KN, and the pressure P of the wrapper roller WR Less than or equal to 120KN, pressure P of lifting platform of coil stripping trolley SC Less than or equal to 100bar, thus reducing the incidence of bright bands and additional waves or reducing the severity of defects.
The following are specific examples of the present invention:
the hot-rolled SPHC steel has a thickness specification of strip steel of 1.0mm to 2.0mm, and the chemical components of the strip steel in percentage by weight (wt.%) are as shown in Table 1, and the balance of Fe and inevitable impurities.
Table 1: chemical composition of strip steel (wt.%)
| C | Si | Mn | P | S | N | B | Alt | |
| Examples | 0.032 | 0.011 | 0.23 | 0.011 | 0.007 | 0.004 | 0.0011 | 0.036 |
| Comparative example | 0.035 | 0.013 | 0.21 | 0.013 | 0.006 | 0.005 | 0.0010 | 0.034 |
The comparison of the strip crown control, the take-up roll system roll profile, and other parameters of the examples and comparative examples are shown in tables 2 and 3 below:
table 2: strip steel crown and roll profile parameters
Table 3: coiling technological parameters
Table 4 below shows the bright band and additional waveform control results of the examples and comparison with the comparative examples.
Table 4: effects of the implementation
Therefore, the method can reduce the incidence rate of the low-carbon mild steel bright band, eliminate or reduce the defect of the bright band accompanying middle waves to a certain extent, and reduce the loss caused by steel coil cutting loss and repeated leveling.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
in the embodiment of the application, a method for controlling the bright band and the wave shape on the surface of the low-carbon mild steel is disclosed, which comprises the following steps: in the finish rolling stage of the strip steel, the convexity of the strip steel is controlled to be less than or equal to C40 and less than or equal to 30 mu m; and in the strip steel coiling stage, the coiling unit tension is controlled to be 20-30 MPa when the strip steel is stably coiled, wherein the roll profile curve of a coiling roll system device used in the strip steel coiling stage is a quadratic parabola curve. The strip steel convexity is optimized in the strip steel finish rolling stage, the roller type of the coiling roller system is optimized to increase the contact area of the strip steel and the roller system, and then the pressure optimization of the coiling roller system enables the contact equivalent stress of the strip steel and the roller system to be smaller than the yield strength of the strip steel finally, so that the incidence rate of low-carbon soft steel bright strips is reduced finally, the defect of medium waves accompanying the bright strips is eliminated or reduced to a certain extent, and the loss caused by steel coil cutting loss and repeated leveling is reduced.
Example two
Based on the same inventive concept, the embodiment provides a control device for a bright band and a wave shape on the surface of low-carbon mild steel, which comprises:
a first control unit 201 for controlling the strip crown at C in the strip finishing stage 40 ≤30μm；
And a second control unit 202 for controlling the coiling unit tension at the time of stably coiling the strip steel to be 20-30 MPa at the strip steel coiling stage, wherein the roll profile curve of the coiling roll system device used at the strip steel coiling stage is a quadratic parabolic curve.
Further, the take-up roller system device includes:
coiling a pinch roll;
a winding auxiliary roller is wound;
a lifting table carrier roller of the coil stripping trolley;
quality control sample station ground roller.
Further, the original convexity of the roll body of the coiling pinch roll is-30 +/-3 mu m; the original convexity of the roller body of the coiling wrapper roller is-30 +/-3 mu m; the original convexity of the roller body of the supporting roller group of the lifting platform of the coil stripping trolley is-5000 +/-50 mu m; the original convexity of the roller body of the quality inspection sampling station ground roller set is-5000 +/-50 mu m.
Further, the control device further comprises:
and the third control unit is used for controlling the pressure of the coiling wrapper roll to be below 120KN and controlling the pressure of the coil stripping trolley lifting platform to be below 100bar after the coiling unit tension is controlled to be 20-30 MPa when the strip steel is stably coiled.
Further, the third control unit is specifically configured to: and controlling the pressure of the pinch roll below 20KN.
Further, the control device further includes:
and the fourth control unit is used for controlling the number of rotating turns of the steel coil before coil stripping to be less than 0.5 turn after the steel coil is supported by the supporting roller of the lifting platform of the coil stripping trolley.
Since the control device (abbreviated as "control device") for the bright band and the middle wave on the surface of the low-carbon mild steel described in this embodiment is a device used for implementing the control method for the bright band and the middle wave on the surface of the low-carbon mild steel described in this embodiment, based on the control method for the bright band and the middle wave on the surface of the low-carbon mild steel described in this embodiment, a person skilled in the art can understand the specific implementation manner and various variations of the control device of this embodiment, and therefore, a detailed description of how the control device implements the method in the embodiment of this application is omitted here. The device adopted by the person skilled in the art to implement the method for controlling the bright zone and the middle wave on the surface of the medium-low carbon mild steel in the embodiment of the present application is within the scope of the protection to be claimed by the present application.
EXAMPLE III
Based on the same inventive concept, this embodiment provides a control device for bright bands and waves on a surface of low-carbon mild steel, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the computer program, the method steps described in any one of the embodiments above may be implemented.
Example four
Based on the same inventive concept, the present embodiment provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, can implement the method steps of any one of the above-mentioned embodiments.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A method for controlling bright bands and wave shapes on the surface of low-carbon mild steel is characterized by comprising the following steps:
controlling the convexity of the strip steel to be C in the strip steel finish rolling stage 40 <30μm；
In the strip steel coiling stage, the coiling unit tension is controlled to be 20-30 MPa when strip steel is stably coiled, wherein the roll profile curve of a coiling roll system device used in the strip steel coiling stage is a quadratic parabola curve;
the take-up roll system device comprises:
coiling a pinch roll, coiling a wrapper roll, an unloading trolley lifting table carrier roller and a quality inspection sampling station ground roll;
the original convexity of the roll body of the coiling pinch roll is-30 +/-3 mu m; the original convexity of the roller body of the coiling wrapper roller is-30 +/-3 mu m; the original convexity of the roller body of the lifting table carrier roller of the coil stripping trolley is-5000 +/-50 mu m; the original convexity of the roller body of the quality inspection sampling station ground roller is-5000 +/-50 mu m,
after the coiling unit tension is controlled to be 20-30 MPa when the strip steel is stably coiled, the method also comprises the following steps:
controlling the pressure of the coiling pinch roll to be less than or equal to 30KN;
controlling the pressure of the coiling auxiliary roller to be less than or equal to 120KN;
and controlling the pressure of the supporting roller of the lifting platform of the coil stripping trolley to be less than or equal to 100bar.
2. The method of claim 1, wherein said controlling said take-up pinch roll pressure to 30KN or less comprises:
and controlling the pressure of the coiling pinch roll to be less than or equal to 20KN.
3. The method as claimed in claim 1, wherein the number of turns of the coil before the coil is discharged is controlled to be 0.5 or less after the coil is supported by the supporting rollers of the elevating table of the coil discharging carriage.
4. A control device for bright bands and wave shapes on the surface of low-carbon mild steel is characterized by comprising:
a first control unit for controlling the convexity of the strip steel at C in the strip steel finish rolling stage 40 <30μm；
The second control unit is used for controlling the coiling unit tension to be 20-30 MPa when the strip steel is stably coiled in the strip steel coiling stage, wherein the roll profile curve of the coiling roll system device used in the strip steel coiling stage is a quadratic parabolic curve;
and the third control unit is used for controlling the pressure of the coiling pinch roll to be less than or equal to 30KN, controlling the pressure of the coiling auxiliary roll to be less than or equal to 120KN and controlling the pressure of the lifting platform carrier roller of the coil stripping trolley to be less than or equal to 100bar after the coiling unit tension is controlled to be 20-30 MPa when the strip steel is stably coiled.
5. A control device for bright bands and waves on the surface of mild low carbon steel, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to perform the method steps according to any one of claims 1 to 3.
6. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, is adapted to carry out the method steps of any of claims 1 to 3.
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| CN202010696211.9A CN112058917B (en) | 2020-07-20 | 2020-07-20 | Method and device for controlling bright band and wave shape on surface of low-carbon mild steel |
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| KR100513594B1 (en) * | 2003-06-17 | 2005-09-09 | 주식회사 포스코 | Method of preventing hot coil strip from bing scratched for producing cold rolled high strength steel |
| CN101693265B (en) * | 2009-11-05 | 2011-12-28 | 北京科技大学 | Method and device for adjusting strip steel transverse warping by using pinch rolls |
| CN102248003A (en) * | 2011-06-26 | 2011-11-23 | 马鞍山钢铁股份有限公司 | Method for overcoming bright band defect of hot-rolled band steel |
| CN104971952B (en) * | 2015-05-25 | 2017-03-22 | 武汉钢铁(集团)公司 | Control method for eliminating flat coiling of hot-rolled thin-gauge checkered plate |
| CN109967528B (en) * | 2019-03-26 | 2020-11-24 | 武汉钢铁有限公司 | Method for preventing hot-rolled strip steel SPHC high-temperature coiling scratch |
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