CN110052499B - Method for reducing single-corner warping defect - Google Patents
Method for reducing single-corner warping defect Download PDFInfo
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- CN110052499B CN110052499B CN201910337705.5A CN201910337705A CN110052499B CN 110052499 B CN110052499 B CN 110052499B CN 201910337705 A CN201910337705 A CN 201910337705A CN 110052499 B CN110052499 B CN 110052499B
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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
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Abstract
The invention provides a method for reducing single-corner warping defects, which comprises the following steps: determining the position of a first driving side of each roller of the roller system of the straightening machine, and adjusting the position of a first working side of each roller of the roller system of the straightening machine by taking the first driving side as a reference, so that each roller of the roller system of the straightening machine has higher levelness and verticality, and the strip steel is stressed more uniformly when passing through the straightening machine and cannot deviate; determining the position of a second driving side of each roller of the roller way roller system, and adjusting the position of a second working side of each roller of the roller way roller system by taking the second driving side as a reference, so that the position of the strip steel entering a straightening machine is ensured when the steel strip is conveyed by the roller way; the position of the center line of the roller system of the straightening machine is determined, the allowable deviation amount of the strip steel is determined according to the thickness of the strip steel, the uniform stress of the strip steel on the section in the width direction is ensured, the generation of the asymmetrical extension of the strip steel is reduced, the generation of single-angle warping is prevented, and the method has good practicability.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for reducing single-angle warping defects.
Background
In the rolling process of hot rolled steel coils, after the steel coils are uncoiled, the steel coils lead the strip heads into pinch rolls through equipment such as compression rollers and strip threading tables to enter a straightening machine for straightening, but in the straightening machine, the position of the steel strips can often deviate from the central line position of a roller system of a unit, and when the roller system of the unit is pressed down for adjustment, the strip steel can be asymmetrically extended and elongated towards two sides due to the fact that the strip steel is stressed unevenly in the width direction caused by the deviation, so that the defect of single-angle upwarp is easily caused after the strip steel is sheared.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a method and a device for judging the slipping position and time of a tension roller of a temper mill, which can judge the slipping position by utilizing the change relation of the actual torque data of the tension roller and judge the slipping starting time and the slipping ending time according to the torque change degree.
In order to achieve the purpose, the invention adopts the following technical scheme:
In one general aspect, there is provided a method of reducing single corner warp defects, comprising the steps of:
Determining the position of a first driving side of each roller of the roller system of the straightener, and adjusting the position of a first working side of each roller of the roller system of the straightener by taking the first driving side as a reference, wherein the first driving side and the first working side are two ends of each roller of the roller system of the straightener;
Determining the position of a second driving side of each roller of the roller way roller system, and adjusting the position of a second working side of each roller of the roller way roller system by taking the second driving side as a reference, wherein the first driving side and the first working side are two ends of each roller of the roller way roller system;
Determining the position of the center line of the roller system of the straightening machine, and determining the allowable deviation of the strip steel according to the thickness of the strip steel.
Preferably, the adjusting the position of the first working side of each roll of the roll train of the leveler with the first driving side as a reference specifically includes:
And defining the value of the first working side higher than the first driving side as a positive value, defining the value of the first working side lower than the first driving side as a negative value, and adjusting the height of the first working side relative to the first driving side to be in a range of-0.05 mm/m to 0.05 mm/m.
Preferably, the adjusting the position of the first working side of each roll of the leveler roll train with reference to the first driving side further includes:
And defining the value of the inclination of the first working side towards the running direction of the unit as a positive value, defining the value of the inclination of the first working side away from the running direction of the unit as a negative value, and adjusting the inclination range of the first working side relative to the first driving side to be-0.1 mm/m.
Preferably, the adjusting the position of the second working side of each roller of the roller way roller system with the second driving side as a reference specifically comprises:
And defining the value of the second working side higher than the second driving side as a positive value, defining the value of the second working side lower than the second driving side as a negative value, and adjusting the height of the second working side relative to the second driving side to be in a range of-0.05 mm/m to 0.05 mm/m.
Preferably, the adjusting the position of the second working side of each roller of the roller train with the second driving side as a reference further includes:
And defining the value of the inclination of the second working side towards the running direction of the unit as a positive value, defining the value of the inclination of the second working side away from the running direction of the unit as a negative value, and adjusting the inclination range of the second working side relative to the second driving side to be-0.1 mm/m.
Preferably, before determining the allowable deviation amount of the strip steel according to the thickness of the strip steel, the method further comprises the following steps:
Determining the buckling limit stress of the strip steel according to a formula sigma Ey/rho;
In the formula: sigma is the buckling limit stress, MPa; e is the elastic modulus of the strip steel, MPa; y is the thickness of the strip steel, mm; rho is coiling radius, mm.
Preferably, the determining of the allowable deviation amount of the strip steel according to the thickness of the strip steel specifically comprises:
Defining the numerical value of the deviation of the strip steel to the driving side as a positive value, defining the numerical value of the deviation of the strip steel to the working side as a negative value, and defining the thickness of the strip steel as y;
When y is more than or equal to 3mm and less than 6mm, the allowable deviation amount of the strip steel ranges from-80 mm to 80 mm;
When y is more than or equal to 6mm and less than 9mm, the allowable deviation amount of the strip steel ranges from-100 mm to 100 mm;
When y is more than or equal to 9mm and less than 12mm, the allowable deviation amount of the strip steel ranges from-120 mm to 120 mm;
When y is more than or equal to 12mm and less than 15mm, the allowable deviation amount of the strip steel ranges from-140 mm to 140 mm;
When y is more than or equal to 15mm and less than or equal to 18mm, the allowable deviation amount of the strip steel ranges from-160 mm to 160 mm.
The invention provides a method for reducing single-angle warping defects, which is characterized in that the position of a first working side of each roller of a roller system of a straightening machine is adjusted by taking a first driving side as a reference, so that each roller of the roller system of the straightening machine has higher levelness and verticality, and strip steel is stressed more uniformly when passing through the straightening machine and cannot deviate; and the position of the second working side of each roller of the roller way roller system is adjusted by taking the second driving side as a reference, so that the position of the strip steel entering the straightening machine is ensured when the steel strip is conveyed by the roller way, the allowable deviation of the strip steel is determined according to the thickness of the strip steel, the uniform stress of the strip steel on the section in the width direction is ensured, the generation of asymmetric extension of the strip steel is reduced, the generation of single-angle warping is prevented, and the method has good practicability.
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 will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of reducing single corner warp defects in accordance with the present invention;
FIG. 2 is a schematic front view showing the structure of a leveler in an embodiment of the present invention;
FIG. 3 is a schematic side view showing the structure of a leveler in an embodiment of the present invention;
FIG. 4 is a diagram of the experimental effect of the method for reducing single corner warp defect of the present invention.
Detailed Description
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.
Fig. 1 is a flowchart of a method for reducing a single corner warp defect of the present invention, and as shown in fig. 1, an embodiment of the present invention discloses a method for reducing a single corner warp defect, including the following steps:
S01, determining the position of the first driving side of each roller of the roller series of the straightening machine, and adjusting the position of the first working side of each roller of the roller series of the straightening machine by taking the first driving side as a reference;
Fig. 2 is a schematic front view of the straightening machine according to the embodiment of the present invention, and as shown in fig. 2, in step S01 of the embodiment, the steel coil is guided into the pinch rolls through the press rolls, the threading table, and the like to enter the straightening machine for straightening. The leveler used in this embodiment can be divided into an upper roll system and a lower roll system, and the leveler roll is mounted in the roll cassettes of the upper and lower roll systems through bearings. Wherein the lower roller 3 is a fixed and rotatable supporting roller, the hydraulic cylinder 1 controls the upper roller box and then controls the upper roller 2 to move up and down, and the upper tension roller and the lower tension roller are arranged in a staggered manner. The direction indicated by the arrow in fig. 2 is the running direction of the strip 4. Since the lower roller 3 is a fixed roller, the height of the lower roller 3 between adjacent rollers is kept substantially constant, and the upper roller 2 can move, so that the upper roller 2 has a large influence on single-angle warping.
Therefore, in this embodiment, the levelness and the verticality of the upper roller 2 need to be accurately regulated and controlled, so as to ensure the straightening quality, specifically, the levelness refers to the deviation of the upper roller 2 relative to the horizontal plane, two ends of the upper roller 2 are divided into a first driving side and a first working side, a value of the first working side higher than the first driving side is defined as a positive value, it can be understood that the first working side tilts in the vertical plane relative to the first driving side, a value of the first working side lower than the first driving side is defined as a negative value, it can be understood that the first working side drops in the vertical plane relative to the first driving side, then, the height of the first working side relative to the first driving side needs to be adjusted, and the range of the guaranteed height is-0.05 mm/m to 0.05 mm/m.
Further, in this embodiment, the perpendicularity refers to a degree of perpendicularity between the central axis of the upper roll 2 and the running direction of the unit, specifically, a value of the first working side inclining towards the running direction of the unit is defined as a positive value, which can be understood as that the first working side inclines towards the running direction of the unit in a horizontal plane relative to the first driving side, and a value of the first working side inclining away from the running direction of the unit is defined as a negative value, which can be understood as that the first working side deviates towards the opposite running direction of the unit in the horizontal plane relative to the first driving side, so that the inclination range of the first working side relative to the first driving side needs to be adjusted to be-0.1 mm/m.
S02, determining the position of a second driving side of each roller of the roller way roller system, and adjusting the position of a second working side of each roller of the roller way roller system by taking the second driving side as a reference;
In step S02 of this embodiment, before the strip 4 enters the straightening machine for straightening, the strip 4 passes through a roller table that is used to transport the strip 4 and to limit the deviation of the strip 4 in the width direction, so that the strip 4 can be transported into the straightening machine more accurately, and the roller tables used can be divided into an upper roller system and a lower roller system, which also have an influence on the warping of the strip 4.
Therefore, in this embodiment, the levelness and the verticality of the roller way roller system need to be accurately regulated and controlled, so as to ensure the straightening quality, specifically, the levelness refers to the deviation of each pressure roller in the roller way roller system relative to the horizontal plane, two ends of each pressure roller in the roller way roller system are divided into a second driving side and a second working side, a value of the second working side higher than the second driving side is defined as a positive value, it can be understood that the second working side tilts in the vertical plane relative to the second driving side, a value of the second working side lower than the second driving side is defined as a negative value, it can be understood that the second working side drops in the vertical plane relative to the second driving side, and then, the height of the second working side relative to the second driving side needs to be adjusted, and the range of the guaranteed height is-0.05 mm/m to 0.05 mm/m.
Further, in this embodiment, the perpendicularity refers to a degree of perpendicularity between a central axis of each pressure roller in the roller way roller system and the running direction of the unit, specifically, a value of inclination of the second working side towards the running direction of the unit is defined as a positive value, which can be understood as that the second working side inclines towards the running direction of the unit in a horizontal plane relative to the second driving side, and a value of inclination of the second working side away from the running direction of the unit is defined as a negative value, which can be understood as that the second working side deviates towards the opposite direction of the running of the unit in the horizontal plane relative to the second driving side, so that the inclination range of the second working side relative to the second driving side needs to be adjusted to be-0.1 mm/m to 0.1 mm/m.
S03, determining the position of the center line of the roller system of the straightener, and determining the allowable deviation of the strip steel according to the thickness of the strip steel;
In step S03 of this embodiment, the position of the center line of the roll system of the leveler is the most uniform position of the strip 4, and when the center line of the strip 4 deviates from the position of the center line of the roll system of the leveler, a single-angle tilting of the strip 4 is caused.
FIG. 3 is a side view schematically showing the structure of the leveler in the embodiment of the present invention, and as shown in FIG. 3, when the strip 4 is placed between the upper and lower rolls 2 and 3, the center line 5 of the roll system of the leveler and the center line 6 of the strip inevitably have a certain offset. The more offset, the higher the resulting lift.
Further, before determining the allowable deviation amount of the strip steel according to the thickness of the strip steel, determining the buckling limit stress of the strip steel according to a formula sigma Ey/rho; in the formula: sigma is the buckling limit stress, MPa; e is the elastic modulus of the strip steel, MPa; y is the thickness of the strip steel, mm; rho is coiling radius, mm. From the above formula, the smaller the thickness of the strip steel is, the smaller the buckling limit stress of the strip steel is, and when the same stress is applied, the smaller the thickness is, the higher the buckling is, and therefore, the allowable deviation range of the strip steel with the smaller thickness is smaller.
Further, if the deviation value of the strip steel to the driving side is defined as a positive value, the deviation value of the strip steel to the working side is defined as a negative value, and the thickness of the strip steel is defined as y, then:
When y is more than or equal to 3mm and less than 6mm, the allowable deviation amount of the strip steel ranges from-80 mm to 80 mm;
When y is more than or equal to 6mm and less than 9mm, the allowable deviation amount of the strip steel ranges from-100 mm to 100 mm;
When y is more than or equal to 9mm and less than 12mm, the allowable deviation amount of the strip steel ranges from-120 mm to 120 mm;
When y is more than or equal to 12mm and less than 15mm, the allowable deviation amount of the strip steel ranges from-140 mm to 140 mm;
When y is more than or equal to 15mm and less than or equal to 18mm, the allowable deviation amount of the strip steel ranges from-160 mm to 160 mm.
Further, in a primary production process, the thickness of the produced strip steel is 6mm, two groups of produced products are obtained by respectively producing the strip steel according to the method without the method and the method, 18 samples are randomly selected from the two groups of products for detection, the obtained single-angle warping height result is shown in fig. 4, fig. 4 is an experimental effect diagram of the method for reducing the single-angle warping defect, the left side of fig. 4 is a measurement result of the warping height without the method, and the average height of the single-angle warping defect is 39.1 mm; the right side of the figure 4 is the measurement result of the warping height by adopting the method, and the average height of the single-angle warping defect is 14.5 mm; the comparison of the two results shows that the single-angle warping defect is obviously reduced, the fluctuation range is reduced, and the accuracy and the stability are obviously improved.
The embodiment of the specification provides a method for reducing single-angle warping defects, and the position of a first working side of each roller of a roller system of a straightening machine is adjusted by taking a first driving side as a reference, so that each roller of the roller system of the straightening machine has higher levelness and verticality, the stress of strip steel is more uniform when the strip steel passes through the straightening machine, and the deviation cannot occur; and the position of the second working side of each roller of the roller way roller system is adjusted by taking the second driving side as a reference, so that the position of the strip steel entering the straightening machine is ensured when the steel strip is conveyed by the roller way, the allowable deviation of the strip steel is determined according to the thickness of the strip steel, the uniform stress of the strip steel on the section in the width direction is ensured, the generation of asymmetric extension of the strip steel is reduced, the generation of single-angle warping is prevented, and the method has good practicability.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present application.
Claims (7)
1. A method for reducing single-corner warping defects is characterized by comprising the following steps:
Determining the position of a first driving side of each roller of a straightener roll system, and adjusting the position of a first working side of each roller of the straightener roll system by taking the first driving side as a reference, wherein the first driving side and the first working side are two ends of each roller of the straightener roll system;
Determining the position of a second driving side of each roller of the roller way roller system, and adjusting the position of a second working side of each roller of the roller way roller system by taking the second driving side as a reference, wherein the second driving side and the second working side are two ends of each roller of the roller way roller system;
Determining the position of the center line of a roller system of the straightening machine, and determining the allowable deviation of the strip steel according to the thickness of the strip steel.
2. The method of claim 1, wherein said adjusting the position of the first work side of each roll of said straightener roll train with reference to said first drive side comprises:
And defining the numerical value of the first working side higher than the first driving side as a positive value, defining the numerical value of the first working side lower than the first driving side as a negative value, and adjusting the height of the first working side relative to the first driving side to be in a range of-0.05 mm/m to 0.05 mm/m.
3. The method of claim 2 wherein said adjusting the position of the first work side of each roll of said straightener roll train with reference to said first drive side further comprises:
And defining the value of the inclination of the first working side towards the running direction of the unit as a positive value, defining the value of the inclination of the first working side away from the running direction of the unit as a negative value, and adjusting the inclination range of the first working side relative to the first driving side to be-0.1 mm/m.
4. The method according to claim 1, wherein the adjusting the position of the second working side of each roller of the roller train with reference to the second driving side comprises:
And defining the numerical value of the second working side higher than the second driving side as a positive value, defining the numerical value of the second working side lower than the second driving side as a negative value, and adjusting the height range of the second working side relative to the second driving side to be-0.05 mm/m.
5. The method of claim 4, wherein said adjusting the position of the second working side of each of the rollers of the roller train relative to the second drive side further comprises:
And defining the value of the inclination of the second working side towards the running direction of the unit as a positive value, defining the value of the inclination of the second working side away from the running direction of the unit as a negative value, and adjusting the inclination range of the second working side relative to the second driving side to be-0.1 mm/m.
6. The method of claim 1, further comprising, before determining the allowable deviation of the strip based on the thickness of the strip:
Determining the buckling limit stress of the strip steel according to a formula sigma Ey/rho;
In the formula: sigma is the buckling limit stress, MPa; e is the elastic modulus of the strip steel, MPa; y is the thickness of the strip steel, mm; rho is coiling radius, mm.
7. The method as claimed in claim 6, wherein the determining the allowable deviation amount of the strip steel according to the thickness of the strip steel specifically comprises:
Defining the numerical value of the deviation of the strip steel to the driving side as a positive value, defining the numerical value of the deviation of the strip steel to the working side as a negative value, and defining the thickness of the strip steel as y;
When y is more than or equal to 3mm and less than 6mm, the allowable deviation amount of the strip steel ranges from-80 mm to 80 mm;
When y is more than or equal to 6mm and less than 9mm, the allowable deviation amount of the strip steel ranges from-100 mm to 100 mm;
When y is more than or equal to 9mm and less than 12mm, the allowable deviation amount of the strip steel ranges from-120 mm to 120 mm;
When y is more than or equal to 12mm and less than 15mm, the allowable deviation amount of the strip steel ranges from-140 mm to 140 mm;
When y is more than or equal to 15mm and less than or equal to 18mm, the allowable deviation amount of the strip steel ranges from-160 mm to 160 mm.
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| CN201910337705.5A CN110052499B (en) | 2019-04-25 | 2019-04-25 | Method for reducing single-corner warping defect |
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| CN201910337705.5A CN110052499B (en) | 2019-04-25 | 2019-04-25 | Method for reducing single-corner warping defect |
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| CN110052499B true CN110052499B (en) | 2020-07-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1920265A1 (en) * | 1969-04-22 | 1970-11-12 | Peddinghaus Dr C Ullrich | Bending machine for bars, wires and profiles |
| JPS5215253B2 (en) * | 1973-01-10 | 1977-04-27 | ||
| CN1029092C (en) * | 1990-03-05 | 1995-06-28 | 卡尔·厄思斯特·洛巴哈 | Contouring of metal sheets |
| CN2286653Y (en) * | 1996-05-10 | 1998-07-29 | 本溪钢铁公司连轧厂 | Device for pressing bending-upwards end of strip-steel continuous rolling machine |
| CN100413610C (en) * | 2005-11-30 | 2008-08-27 | 宝山钢铁股份有限公司 | Control method for preventing head-bent of band-steel while milling course |
| CN101293262B (en) * | 2008-06-19 | 2010-12-15 | 王银 | Continuous roller type cold bending shaping method for metal sheet pile |
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