CN113020270A - Strip steel leveling method - Google Patents
Strip steel leveling method Download PDFInfo
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- CN113020270A CN113020270A CN202110279774.2A CN202110279774A CN113020270A CN 113020270 A CN113020270 A CN 113020270A CN 202110279774 A CN202110279774 A CN 202110279774A CN 113020270 A CN113020270 A CN 113020270A
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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
- 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
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
- B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
- B21B2013/021—Twin mills
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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
- 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
- B21B2015/0064—Uncoiling 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
- 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
- B21B2015/0071—Levelling the rolled product
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Abstract
The invention discloses a strip steel leveling method. The strip steel leveling method comprises the following steps: s1: replacing the leveling working roll with a CVC type working roll; s2: adjusting the roll shifting position of the CVC type working roll to reduce the middle gap between the upper roll and the lower roll of the CVC type working roll; s3: setting the operation parameters of the temper mill; s4: the strip steel enters a gap between an upper roller and a lower roller of the CVC type working roller, and the middle part of the strip steel is positioned in the middle of the gap; s5: judging whether the strip steel enters a gap between the upper roller and the lower roller or not and whether the middle of the strip steel is positioned in the middle of the gap or not, if so, executing step S6, otherwise, executing step S4; s6: and (5) flattening the strip steel. The middle gaps of the upper roller and the lower roller are reduced, so that the pressure borne by the middle part of the strip steel is larger, the metal flow quantity of the middle part of the strip steel is larger, the turtle back defect of the strip steel is improved, the product percent of pass of the strip steel is improved, and the economic benefit of a steel rolling mill is improved.
Description
Technical Field
The invention relates to the technical field of strip steel leveling methods, in particular to a strip steel leveling method.
Background
In the rolling production process, the phenomenon of 'turtleback' is a common defect of medium-thickness strip steel, and the turtleback defect mainly refers to the defect that the strip steel has poor flatness in the width direction and the cross section forms middle arch.
At present, a special concave-convex roller straightener is not configured in part of steel rolling mills, and the existing three-roller straightener can only straighten the head and the tail of the strip steel, so that the defects of the back of the strip steel are serious, the product percent of pass of the strip steel is reduced, and the economic benefit of the mill is reduced.
Therefore, how to improve the economic efficiency of a steel mill is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide a strip steel leveling method to improve the economic benefit of a steel mill.
In order to achieve the purpose, the invention provides the following technical scheme:
a strip steel leveling method adopts a leveling machine, the leveling machine comprises a leveling working roll, and the strip steel leveling method comprises the following steps:
s1: replacing the leveling working roll with a CVC type working roll;
s2: adjusting the roll shifting position of the CVC type working roll to reduce a middle gap between an upper roll and a lower roll of the CVC type working roll;
s3: setting the operation parameters of the temper mill;
s4: the strip steel enters a gap between an upper roller and a lower roller of the CVC type working roller, and the middle part of the strip steel is positioned in the middle of the gap;
s5: judging whether the strip steel enters a gap between the upper roller and the lower roller or not, and whether the middle of the strip steel is positioned in the middle of the gap or not, if so, executing step S6, otherwise, executing step S4;
s6: and leveling the strip steel.
Preferably, in the above strip leveling method, the step S2 includes:
s2-1: the upper roller moves to the transmission side of the temper mill along the axis of the upper roller;
s2-2: the lower roll moves along the axis of the lower roll to the operating side of the leveler.
Preferably, in the strip flattening method, a moving amount of the upper roll is 150mm, and a moving amount of the lower roll is 150 mm.
Preferably, in the above strip leveling method, the step S3 includes:
s3-1: setting an uncoiling tension value and a coiling tension value;
s3-2: setting a control mode and a rolling force of the temper mill;
s3-3: the roll bending force is set.
Preferably, in the strip steel leveling method, the uncoiling tension value is 150KN, and the coiling tension value is 300 KN; the control mode of the temper mill is a constant pressure control mode, and the rolling force is 500-700 t; the roll bending force is +500 KN.
Preferably, in the above strip leveling method, the step S6 includes:
s6-1: pre-adjusting the rolling force difference of the two sides of the upper roller and the lower roller;
s6-2: judging whether the strip steel has the defect of single edge wave, if so, executing a step S6-1, otherwise, executing a step S6-3;
s6-3: and continuously flattening the strip steel.
Preferably, in the above strip leveling method, the S6-3 includes:
s6-3 a: judging whether the strip steel has a middle wave defect, if so, executing a step S6-3b, otherwise, executing a step S6-3 d;
s6-3 b: adjusting the magnitude and direction of the roll bending force;
s6-3 c: judging whether the middle wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3d, otherwise, executing the step S6-3 b;
s6-3 d: and (6) ending.
Preferably, in the above strip leveling method, the step S6-3b includes:
s6-3b 1: judging whether a positive roll bending force is adopted, if so, executing the step S6-3b2, otherwise, executing the step S6-3b 6;
s6-3b 2: reducing the magnitude of the positive roll bending force;
s6-3b 3: judging whether the middle wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3b8, otherwise, executing the step S6-3b 4;
s6-3b 4: changing to negative roll bending force;
s6-3b 5: judging whether the middle wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3b8, otherwise, executing the step S6-3b 6;
s6-3b 6: increasing the negative roll bending force;
s6-3b 7: judging whether the middle wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3b8, otherwise, executing the step S6-3b 6;
s6-3b 8: and (6) ending.
Preferably, in the above strip leveling method, the S6-3 further includes:
s6-3 aa: judging whether the strip steel has double-edge wave defects or not, if so, executing the step S6-3bb, otherwise, executing the step S6-3 dd;
s6-3 bb: adjusting the magnitude and direction of the roll bending force;
s6-3 cc: judging whether the double-edge wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3dd, and otherwise, executing the step S6-3 bb;
s6-3 dd: and (6) ending.
Preferably, in the above strip leveling method, the step S6-3bb includes:
s6-3bb 1: when the negative bending force is employed, performing steps S6-3bb2, when the positive bending force is employed, performing steps S6-3bb 4;
s6-3bb 2: changing to positive roll bending force;
s6-3bb 3: judging whether the double-edge wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3bb6, otherwise, executing the step S6-3bb 4;
s6-3bb 4: the positive roll bending force is increased;
s6-3bb 5: judging whether the double-edge wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3bb6, otherwise, executing the step S6-3bb 4;
s6-3bb 6: and (6) ending.
When the strip steel leveling method provided by the invention is used, the leveling working roll of the existing leveling machine in our factory is replaced by the CVC type working roll, and then the roll shifting position of the CVC type working roll is adjusted, so that the middle gap between the upper roll and the lower roll of the CVC type working roll is reduced; then the strip steel enters a gap between an upper roller and a lower roller of the CVC working roller, the middle part of the strip steel enters a middle gap between the upper roller and the lower roller, and the middle part of the strip steel is subjected to higher pressure of the upper roller and the lower roller because the middle gap is reduced, so that the metal flow quantity in the middle part of the strip steel is larger, the turtle back defect of the strip steel is improved, the product qualification rate of the strip steel is improved, and the economic benefit of a steel rolling mill is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a CVC type work roll with the roll shifting position not adjusted according to an embodiment of the present invention;
fig. 2 is a CVC type work roll after adjusting the position of a running roll according to an embodiment of the present invention;
FIG. 3 is a flow chart of a strip steel leveling method according to an embodiment of the present invention;
FIG. 4 is a flowchart of a step-by-step method of step S2 according to an embodiment of the present invention;
FIG. 5 is a flowchart of a step-by-step method of step S3 according to an embodiment of the present invention;
FIG. 6 is a flowchart of a step-by-step method of step S6 according to an embodiment of the present invention;
FIG. 7 is a flowchart of a step-by-step method for improving the Zhonglang fault according to an embodiment of the present invention;
FIG. 8 is a flowchart of a step-by-step method of step S6-3b according to an embodiment of the present invention;
FIG. 9 is a flowchart of a step-by-step method for improving double edge wave defects according to an embodiment of the present invention;
fig. 10 is a flowchart of a distribution method of step S6-3bb according to an embodiment of the present invention.
Wherein 100 is an upper roll, 200 is a lower roll, 300 is a strip steel, A is an operation side, and B is a driving side.
Detailed Description
In view of the above, the core of the present invention is to provide a strip steel leveling method to improve the economic efficiency of a steel mill.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 10, the embodiment of the invention discloses a strip steel leveling method, which adopts a leveling machine, wherein the leveling machine comprises a leveling working roll, and the strip steel leveling method comprises the following steps:
s1: the flattening working rolls are replaced by CVC type working rolls (CVC is an abbreviation of continuous Variable Crown), so that the existing flattening machine of a steel rolling mill is utilized to flatten the strip steel 300 on the premise of not increasing a concave-convex straightening machine, the defect of the back of the strip steel 300 can be overcome, the cost for additionally purchasing equipment can not be increased, the cost is saved, and the economic benefit of the steel rolling mill is improved.
S2: the roll shifting position of the CVC type working roll is adjusted, so that a middle gap between an upper roll 100 and a lower roll 200 of the CVC type working roll is reduced, and when the CVC type working roll is leveled, the leveling effect which is the same as that of a positive convexity working roll (the diameter of the middle roll body of the positive convexity working roll is larger than that of the roll bodies at the left end and the right end) is generated on the strip steel 300 through the CVC type working roll, namely, the middle part of the strip steel 300 is stressed greatly, and the two sides of the strip steel 300 are stressed slightly in the leveling process.
S3: the operation parameters of the leveler are set so that the strip steel 300 can be smoothly operated in the leveling process.
S4: the strip 300 enters a gap between the upper and lower rolls 100 and 200 of the CVC type work roll, and the middle portion of the strip 300 is positioned at the middle of the gap, so that the strip 300 is flattened by the CVC type work roll.
S5: it is judged whether the strip steel 300 enters the gap between the upper and lower rolls 100 and 200 and whether the middle portion of the strip steel 300 is positioned at the middle portion of the gap, if so, the step S6 is performed, and if not, the step S4 is performed.
S6: the strip 300 is flattened to improve the turtle back defect.
When the strip steel leveling method provided by the invention is used, the leveling working roll of the existing leveling machine in our factory is replaced by the CVC type working roll, and then the roll shifting position of the CVC type working roll is adjusted, so that the middle gap between the upper roll 100 and the lower roll 200 of the CVC type working roll is reduced; and then the strip steel 300 enters a gap between the upper roller 100 and the lower roller 200 of the CVC type working roller, and the middle part of the strip steel 300 is positioned in the middle of the gap, because the middle gap is reduced, the pressure of the upper roller 100 and the lower roller 200 on the middle part of the strip steel 300 is larger, so that the metal flow quantity in the middle part of the strip steel 300 is larger, the turtle back defect of the strip steel 300 is improved, the product qualification rate of the strip steel 300 is improved, and the economic benefit of a steel rolling mill is improved.
For convenience of subsequent description, the present invention will be described in detail with respect to the specific structure of the CVC type work roll, and as shown in fig. 1, the CVC type work roll has the slightly S-shaped roll bodies of the upper roll 100 and the lower roll 200, and the S-shaped profiles of the upper roll 100 and the lower roll 200 are disposed inverted by 180 ° with respect to each other, so that a roll gap is formed between the upper roll 100 and the lower roll 200, and the contour lines of the roll gap are in a symmetrical relationship with respect to the center line of the roll gap; in addition, one end of the CVC type work roll is an operation side a and the other end is a driving side B, and the CVC type work roll includes an upper roll 100 and a lower roll 200.
In the strip steel flattening method provided by the invention, in the step S2, the roll shifting position of the CVC type working roll is adjusted, only the roll shifting position of the upper roll 100 is adjusted, or only the roll shifting position of the lower roll 200 is adjusted, and the roll shifting positions of the upper roll 100 and the lower roll 200 can also be adjusted at the same time, so long as the middle gap between the upper roll 100 and the lower roll 200 can be reduced, the adjusting mode which can generate the same flattening effect as that of the working roll with positive convexity on the strip steel 300 belongs to the protection scope of the invention; preferably, the embodiment of the present invention simultaneously adjusts the roll shifting positions of the upper and lower rolls 100 and 200 so as to provide the strip steel 300 with a good flattening effect.
Specifically, step S2 includes:
s2-1: the upper roll 100 is moved along the axis of the upper roll 100 toward the drive side B of the leveler to facilitate the movement of the bulging portion of the "S" shaped profile of the upper roll 100 toward the middle of the roll gap.
S2-2: the lower roll 200 is moved toward the operation side a of the leveler along the axis of the lower roll 200 so that the protrusion of the S-shaped profile of the lower roll 200 moves toward the middle of the gap, cooperating with the protrusion of the S-shaped profile of the upper roll 100, so that the middle gap between the upper roll 100 and the lower roll 200 becomes smaller.
It should be noted that, the movement amounts of the upper roller 100 and the lower roller 200 are not specifically limited, and in actual production, the movement amounts of the upper roller 100 and the lower roller 200 may be adaptively adjusted according to actual defects of the strip steel 300, and any movement amount that can meet the use requirements is within the protection scope of the present invention; preferably, the embodiment of the present invention makes the moving amount of the upper roll 100 be 150mm and the moving amount of the lower roll 200 be 150mm for the turtle back defect of the strip steel 300 rolled by my factory.
Further, the setting of the operation parameters of the leveler in the step S3 includes:
s3-1: and setting an uncoiling tension value and a coiling tension value so as to enable the strip steel 300 to enter a temper mill, and coiling the strip steel 300 into a cylindrical shape through the coiling tension value after the temper mill is finished.
S3-2: the control mode and the rolling force of the leveler are set so that the strip steel 300 is sufficiently deformed by the rolling force, thereby improving the back defect.
S3-3: the roll bending force is set so as to reduce the double-edge wave defect and the medium-wave defect of the strip steel 300.
In step S3-1, the magnitude of the unwinding tension and the winding tension is not particularly limited, and any tension that can satisfy the usage requirement falls within the scope of the present invention; preferably, in order to improve the stability of the strip steel 300 in the leveling process, a large tension control mode is adopted for the uncoiling tension value and the coiling tension value; specifically, the unwinding tension value adopted in the embodiment of the present invention is 150KN, and the winding tension value is 300 KN.
In addition, the control mode and the rolling force of the temper mill are not limited, in practical application, the control mode and the rolling force can be adaptively adjusted according to the actual defects of the strip steel 300, and the control mode and the rolling force which are beneficial to improving the turtle back defects belong to the protection scope of the invention; preferably, the embodiment of the invention adopts a constant pressure control mode, and the rolling force is 500-700t, so that the strip steel 300 can generate enough deformation, and the turtle back defect is further improved.
In addition, the magnitude of the bending force is not specifically limited, and the bending force can be adaptively adjusted according to the double-edge wave defect or the single-edge wave defect generated after the strip steel 300 is leveled in practical application.
For convenience of subsequent description, the direction of the roll bending force is specifically described in the invention, the roll bending force is divided into positive roll bending force and negative roll bending force, the positive roll bending force is that the roll bending force is increased upwards by the upper roll 100, the roll bending force is increased downwards by the lower roll 200, the bending degree of the upper roll 100 and the lower roll 200 is increased, and the pressure applied to the middle part of the strip steel 300 is larger than the pressure applied to the two sides of the strip steel 300; the negative bending force is that the upper roller 100 increases the bending force downwards, the lower roller 200 increases the bending force upwards, and the curvature of the upper roller 100 and the lower roller 200 decreases, so that the pressure on the two sides of the strip steel 300 is greater than the pressure on the middle of the strip steel 300.
Further, step S6 includes:
s6-1: the difference in rolling force between both sides of the upper and lower rolls 100 and 200 is adjusted in advance to reduce the single edge wave defect.
S6-2: judging whether the strip steel 300 has the single-edge wave defect, if so, executing the step S6-1, otherwise, executing the step S6-3 so as to judge whether the strip steel 300 has the single-edge wave defect, and further determining whether the rolling force difference of the upper roller 100 and the lower roller 200 needs to be adjusted.
S6-3: the strip 300 is continuously flattened to improve the quality of the strip 300.
In the above step S6-1, the rolling force difference between both sides of the upper and lower rolls 100 and 200 is adjusted according to the metal flow velocity of both sides of the strip steel 300 during the leveling process; specifically, when the metal flowing speed of the strip steel 300 on the operation side A is low, the rolling reduction of the driving side B is increased to slow down the metal flowing speed of the driving side B, so that the metal flowing speeds of the operation side A and the driving side B tend to be consistent, and the single edge wave defect of the strip steel 300 is prevented; when the metal flowing speed of the strip steel 300 on the driving side B is low, the rolling reduction of the driving side B is reduced to increase the metal flowing speed of the driving side B, so that the metal flowing speeds of the driving side B and the operating side A tend to be consistent, and the defect of single edge wave is prevented.
Further, in the above strip leveling method, step S6-3 includes:
s6-3 a: judging whether the strip steel 300 has the moderate wave defect, if so, executing the step S6-3b, otherwise, executing the step S6-3d, so as to further improve the strip steel 300 with the moderate wave defect.
S6-3 b: the magnitude and direction of the roll bending force are adjusted so as to improve the middle wave defect of the strip steel 300 and further improve the product percent of pass of the strip steel 300.
S6-3 c: and judging whether the Zhonglang defect of the strip steel 300 is adjusted to be qualified or not, if so, executing the step S6-3d, otherwise, executing the step S6-3b, so that the Zhonglang defect of the strip steel 300 is improved to be in a qualified range required by a client, and the economic benefit is improved.
S6-3 d: and (6) ending.
Specifically, the step S6-3b includes:
s6-3b 1: when the positive bending force is used, the step S6-3b2 is performed, and when the negative bending force is used, the step S6-3b6 is performed in order to improve the center wave defect of the strip steel 300.
S6-3b 2: the magnitude of the positive bending roll force is reduced so as to reduce the pressure applied to the middle part of the strip steel 300, so that the metal flowing speed in the middle part of the strip steel 300 is reduced, and the middle wave defect of the strip steel 300 is improved.
S6-3b 3: judging whether the band steel 300 has the middle wave defect adjusted to be qualified or not, if so, executing the step S6-3b8, otherwise, executing the step S6-3b4 so as to further flatten the band steel 300 with the middle wave defect.
S6-3b 4: the negative bending roll force is used instead, so that the pressure on the two sides of the strip steel 300 is increased, the metal flow speed on the two sides of the strip steel 300 is higher than that in the middle of the strip steel 300, and the defect of middle waves is further improved.
S6-3b 5: judging whether the middle wave defect of the strip steel 300 is adjusted to be qualified or not, if so, executing the step S6-3b8, otherwise, executing the step S6-3b6 so as to further straighten the strip steel 300 which is not leveled to be qualified.
S6-3b 6: and increasing the negative bending roll force so as to further increase the metal flowing speed at the two sides of the strip steel 300 and straighten the strip steel 300 which is not leveled to be qualified until the middle wave defect is adjusted to be qualified.
S6-3b 7: judging whether the middle wave defect of the strip steel 300 is adjusted to be qualified or not, if so, executing the step S6-3b8, otherwise, executing the step S6-3b6, so that the middle wave defect of the strip steel 300 is improved to be within the qualified range required by a client, and the economic benefit is improved.
S6-3b 8: and (6) ending.
In addition, S6-3 of the strip steel flattening method provided by the invention also comprises the following steps:
s6-3 aa: judging whether the strip steel 300 has the double side wave defect, if so, executing the step S6-3bb, and if not, executing the step S6-3dd, so as to improve the double side wave defect of the strip steel 300.
S6-3 bb: the magnitude and direction of the roll bending force are adjusted so as to improve the double-side wave defect of the strip steel 300 and further improve the product qualification rate of the strip steel 300.
S6-3 cc: judging whether the double-side wave defect of the strip steel 300 is adjusted to be qualified or not, if so, executing the step S6-3dd, otherwise, executing the step S6-3bb, so that the double-side wave defect of the strip steel 300 is improved to be within the qualified range required by a client, and the economic benefit is improved.
S6-3 dd: and (6) ending.
It should be noted that, the steps S6-3aa and S6-3a are not sequential, and any sequence that can improve the flatness of the strip steel 300 and further improve the product yield of the strip steel 300 falls within the protection scope of the present invention.
Specifically, the step S6-3bb includes:
s6-3bb 1: when the negative bending roll force is used, the steps S6-3bb2 are performed, and when the positive bending roll force is used, the steps S6-3bb4 are performed in order to improve the double edge wave defect of the strip steel 300.
S6-3bb 2: the positive roll bending force is used instead, so that the pressure on the middle part of the strip steel 300 is greater than the pressure on the two sides of the strip steel 300, the metal flowing speed on the middle part of the strip steel 300 is greater than the metal flowing speed on the two sides of the strip steel 300, and the double-side wave defect is improved.
S6-3bb 3: judging whether the double-edge wave defect of the strip steel 300 is adjusted to be qualified or not, if so, executing the step S6-3bb6, and if not, executing the step S6-3bb4 so as to judge whether the double-edge wave defect still exists in the strip steel 300 and further judge whether the strip steel 300 needs to be straightened or not.
S6-3bb 4: the positive roll bending force is increased so as to further increase the pressure applied to the middle of the strip steel 300, further accelerate the metal flowing speed at the middle of the strip steel 300 and further straighten the strip steel 300 with the double-side wave defect.
S6-3bb 5: judging whether the double-side wave defect of the strip steel 300 is adjusted to be qualified or not, if so, executing the step S6-3bb6, and if not, executing the step S6-3bb4, so that the double-side wave defect of the strip steel 300 is improved to be within the qualified range required by a client, and the economic benefit is improved.
S6-3bb 6: and (6) ending.
After the strip steel leveling method provided by the invention is used, the plate type qualification rate of hot-rolled high-strength steel produced by the factory is improved to 95% from 75%, the price difference between a degraded product without tortoise back defect improvement and a normal product after tortoise back defect improvement is 800 yuan/ton, the yield of the annual hot-rolled high-strength steel is 2 ten thousand tons, and the annual economic benefit improvement value is as follows:
q ═ a-B) × C × D ═ (95% -75%) × 800 × 20000 ═ 400 ten thousand yuan
Wherein Q is the annual economic benefit improvement value;
a, the percent of pass of the improved hot-rolled high-strength steel plate;
b, the qualification rate of the hot-rolled high-strength steel plate before improvement;
c-the valence difference between the genuine and downgraded products, in units: 800 yuan/ton;
d, yield of the hot-rolled high-strength steel all year round, unit: ton.
The terms "first" and "second," and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not listed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A strip steel leveling method is used for improving turtle back defects and is characterized in that a leveling machine is adopted, the leveling machine comprises a leveling working roll, and the strip steel leveling method comprises the following steps:
s1: replacing the leveling working roll with a CVC type working roll;
s2: adjusting the roll shifting position of the CVC type working roll to reduce a middle gap between an upper roll and a lower roll of the CVC type working roll;
s3: setting the operation parameters of the temper mill;
s4: the strip steel enters a gap between an upper roller and a lower roller of the CVC type working roller, and the middle part of the strip steel is positioned in the middle of the gap;
s5: judging whether the strip steel enters a gap between the upper roller and the lower roller or not, and whether the middle of the strip steel is positioned in the middle of the gap or not, if so, executing step S6, otherwise, executing step S4;
s6: and leveling the strip steel.
2. The strip flattening method of claim 1, wherein said step S2 includes:
s2-1: the upper roller moves to the transmission side of the temper mill along the axis of the upper roller;
s2-2: the lower roll moves along the axis of the lower roll to the operating side of the leveler.
3. The strip flattening method of claim 2, wherein the moving amount of said upper roller is 150mm and the moving amount of said lower roller is 150 mm.
4. The strip flattening method of claim 1, wherein said step S3 includes:
s3-1: setting an uncoiling tension value and a coiling tension value;
s3-2: setting a control mode and a rolling force of the temper mill;
s3-3: the roll bending force is set.
5. The strip leveling method as claimed in claim 4, wherein the uncoiling tension value is 150KN and the coiling tension value is 300 KN; the control mode of the temper mill is a constant pressure control mode, and the rolling force is 500-700 t; the roll bending force is +500 KN.
6. The strip flattening method of claim 1, wherein said step S6 includes:
s6-1: pre-adjusting the rolling force difference of the two sides of the upper roller and the lower roller;
s6-2: judging whether the strip steel has the defect of single edge wave, if so, executing a step S6-1, otherwise, executing a step S6-3;
s6-3: and continuously flattening the strip steel.
7. The strip flattening method of claim 6, wherein said S6-3 includes:
s6-3 a: judging whether the strip steel has a middle wave defect, if so, executing a step S6-3b, otherwise, executing a step S6-3 d;
s6-3 b: adjusting the magnitude and direction of the roll bending force;
s6-3 c: judging whether the middle wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3d, otherwise, executing the step S6-3 b;
s6-3 d: and (6) ending.
8. The strip flattening method of claim 7, wherein the step S6-3b includes:
s6-3b 1: judging whether a positive roll bending force is adopted, if so, executing the step S6-3b2, otherwise, executing the step S6-3b 6;
s6-3b 2: reducing the magnitude of the positive roll bending force;
s6-3b 3: judging whether the middle wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3b8, otherwise, executing the step S6-3b 4;
s6-3b 4: changing to negative roll bending force;
s6-3b 5: judging whether the middle wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3b8, otherwise, executing the step S6-3b 6;
s6-3b 6: increasing the negative roll bending force;
s6-3b 7: judging whether the middle wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3b8, otherwise, executing the step S6-3b 6;
s6-3b 8: and (6) ending.
9. The strip flattening method of claim 6, wherein said S6-3 further comprises:
s6-3 aa: judging whether the strip steel has double-edge wave defects or not, if so, executing the step S6-3bb, otherwise, executing the step S6-3 dd;
s6-3 bb: adjusting the magnitude and direction of the roll bending force;
s6-3 cc: judging whether the double-edge wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3dd, and otherwise, executing the step S6-3 bb;
s6-3 dd: and (6) ending.
10. The strip leveling method as claimed in claim 9, wherein the step S6-3bb includes:
s6-3bb 1: judging whether a negative bending roll force is adopted, if so, executing the step S6-3bb2, otherwise, executing the step S6-3bb 4;
s6-3bb 2: changing to positive roll bending force;
s6-3bb 3: judging whether the double-edge wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3bb6, otherwise, executing the step S6-3bb 4;
s6-3bb 4: the positive roll bending force is increased;
s6-3bb 5: judging whether the double-edge wave defect of the strip steel is adjusted to be qualified or not, if so, executing the step S6-3bb6, otherwise, executing the step S6-3bb 4;
s6-3bb 6: and (6) ending.
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|---|---|---|---|
| CN202110279774.2A CN113020270A (en) | 2021-03-16 | 2021-03-16 | Strip steel leveling method |
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| CN202110279774.2A CN113020270A (en) | 2021-03-16 | 2021-03-16 | Strip steel leveling method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276273A (en) * | 1999-05-20 | 2000-12-13 | 丹尼利联合公司－丹尼利公司分公司 | Antisymmetric variety arch rollers and combination method thereof |
| CN1485156A (en) * | 2002-09-28 | 2004-03-31 | 鞍钢集团新钢铁有限责任公司 | Hot-rolled strip steel moderate sea profile shape controlling method |
-
2021
- 2021-03-16 CN CN202110279774.2A patent/CN113020270A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276273A (en) * | 1999-05-20 | 2000-12-13 | 丹尼利联合公司－丹尼利公司分公司 | Antisymmetric variety arch rollers and combination method thereof |
| CN1485156A (en) * | 2002-09-28 | 2004-03-31 | 鞍钢集团新钢铁有限责任公司 | Hot-rolled strip steel moderate sea profile shape controlling method |
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