CN114618907A - Method for repairing shape of hot rolled steel plate - Google Patents
Method for repairing shape of hot rolled steel plate Download PDFInfo
- Publication number
- CN114618907A CN114618907A CN202210273290.1A CN202210273290A CN114618907A CN 114618907 A CN114618907 A CN 114618907A CN 202210273290 A CN202210273290 A CN 202210273290A CN 114618907 A CN114618907 A CN 114618907A
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- plate
- roller
- shape
- repairing
- roll
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 22
- 239000010959 steel Substances 0.000 title claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 27
- 244000046095 Psophocarpus tetragonolobus Species 0.000 claims abstract description 19
- 235000010580 Psophocarpus tetragonolobus Nutrition 0.000 claims abstract description 19
- 238000004064 recycling Methods 0.000 claims abstract description 4
- 239000002699 waste material Substances 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 208000034656 Contusions Diseases 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 230000009519 contusion Effects 0.000 claims description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
Abstract
The invention discloses a method for repairing the shape of a hot-rolled steel plate, which comprises the following steps: step one, selecting a working mode; step two, selecting a working roll; setting front and rear tension; step four, setting the reduction; step five, starting repairing; step six, recycling the waste roller; in the second step, the wave shape of the produced checkered plate is basically double-side wave or single-side wave, the middle wave is less, aiming at the characteristics, the roller shape is a concave roller, the flat plate repairing roller shape is a flat roller and has no concavity, in the fourth step, the small reduction required by rolling is finally determined to be suitable within 1050 plus 1800KN through multiple experiments, and compared with the existing hot rolled steel plate shape repairing method, the method can effectively eliminate the adverse effect of vibration on equipment; the pattern plate with poor plate shape has good plate shape after being flattened, and the height of the hyacinth bean meets the requirement; the special roller for flattening the checkered plate is used instead, so that the problems of reduced flat plate flattening capability, increased grinding cost and the like are effectively solved.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for repairing the shape of a hot rolled steel plate.
Background
The poor plate shape of the hot-rolled plate strip steel is a common problem and a difficult point existing in a hot-rolling production line, when the plate is poor in plate shape, a flattening machine set can be used for repairing and improving the plate shape, when the checkered plate is rolled, the pattern height is generated by a last machine frame, the plate shape is poor, but the pattern plate is flattened according to a flattening flat plate process, hyacinth beans can be flattened, the height of the hyacinth beans is not in accordance with the standard, and in order to solve the problem that the height of the hyacinth beans is guaranteed when the pattern plate is improved, a flattening process of the checkered plate without flattening the hyacinth beans needs to be researched.
Disclosure of Invention
The invention aims to provide a method for repairing the shape of a hot-rolled steel plate, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for repairing the shape of a hot-rolled steel plate comprises the following steps: step one, selecting a working mode; step two, selecting a working roll; setting front and rear tension; step four, setting the reduction; step five, starting repairing; step six, recycling the waste roller;
in the first step, firstly, the working mode of the unit is selected to be a leveling mode, the leveling four-roller mill adopts pressure closed-loop control, and meanwhile, the straightening unit is selected to be a mode that a motor is disengaged from a driven screw-down mode;
in the second step, the roll shape of the working roll used by the unit is designed into a concave roll shape, the concavity is-0.04 mm, and the edge rolling reduction is increased by matching with the control of a negative bending roll;
in the third step, the set range of the tension is determined through a plurality of experiments, wherein the uncoiling tension is 50-70KN, and the coiling tension is 130-160 KN;
in the fourth step, in order to prevent the flattening deformation of the checkered plate hyacinth beans caused by overlarge rolling reduction, rolling with small rolling reduction is adopted;
in the fifth step, the checkered plate to be repaired is placed into a flattening unit, and the checkered plate is flattened at a low speed by using a working roller;
in the sixth step, when the working roller is used to the diameter of phi 570mm close to the diameter of the scrapped roller, the roller needs to be replaced in advance, and the working roller which reaches phi 570mm after grinding is re-paired and is changed into a special roller for flattening the checkered plate.
Preferably, in the first step, due to the characteristics of the checkered plate, certain particularity exists on the contact surface of the checkered plate and the leveling working roll in the rolling process, so that the whole unit vibrates greatly, and in order to prevent the pipeline interface of the unit from loosening or cracking and leaking oil due to excessive vibration of the high-speed production unit, the unit needs to adopt a low-speed leveling mode, the speed of the unit is controlled to be less than or equal to 60m/min, and the speed of the flat plate repairing unit can reach 300 m/min.
Preferably, in the second step, the wave shape of the produced checkered plate is basically double-side wave or single-side wave, the middle wave is less, and aiming at the characteristic, the roller shape is a concave roller, and the flat plate repairing roller shape is a flat roller without concavity.
Preferably, in the third step, the stress area of the patterned plate hyacinth bean is small, the tension is not set to be too large, otherwise the hyacinth bean is inclined and deformed along the rolling direction, meanwhile, the steel coil tightness can not reach the flat plate tightness due to the characteristics of the patterned plate, if the tension is set to be too large in the leveling process, the relative sliding (i.e. the loose rolling) phenomenon of the contact surfaces of the upper layer and the lower layer is easily caused, and the contusion phenomena of different degrees are caused on the surface of the lower surface flat plate and the plane of the hyacinth bean, wherein the uncoiling tension during flat plate repair is 100-type 180KN, and the curling tension is 160-type 200 KN.
Preferably, in the fourth step, the small reduction required by the rolling is finally determined to be within 1050 and 1800KN through multiple experiments.
Preferably, in the sixth step, the specification of the working roll of the leveling line is phi 630/560 multiplied by 1780mm, when the working roll is used to be phi 570mm close to the diameter of a scrapped roll, the working roll is influenced by the characteristics of the roll, the difficulty of adjusting the plate shape is increased when the plate is leveled, the requirement of normal production kilometers cannot be met, the roll needs to be changed in advance, the service cycle of the roll is shortened, and the grinding frequency is increased.
Compared with the prior art, the invention has the beneficial effects that: compared with the existing hot rolled steel plate shape repairing method, the method can effectively eliminate the adverse effect of vibration on equipment; the pattern plate with poor plate shape has good plate shape after being flattened, and the height of the hyacinth bean meets the requirement; the special roller for flattening the checkered plate is used instead, so that the problems of reduced flat plate flattening capability, increased grinding cost and the like are effectively solved.
Drawings
FIG. 1 is a flow chart of the method 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.
Referring to fig. 1, an embodiment of the present invention: a method for repairing the shape of a hot-rolled steel plate comprises the following steps: step one, selecting a working mode; step two, selecting a working roll; setting front and rear tension; step four, setting the reduction; step five, starting repairing; step six, recycling the waste roller;
in the first step, firstly, a leveling mode is selected as a unit working mode, and due to the characteristics of the checkered plate, certain particularity exists on a contact surface with a leveling working roller in the rolling process, so that the unit vibrates greatly as a whole, and in order to prevent the unit from vibrating too much during high-speed production, the pipe joint of the unit is loosened or cracked to leak oil, the unit needs to adopt a low-speed leveling mode, the speed of the unit is controlled to be less than or equal to 60m/min, the speed of a flat plate repairing unit can reach 300m/min, a four-roller leveling mill adopts pressure closed-loop control, and meanwhile, a driven pressing mode of a motor is selected as a straightening unit, so that the residual stress in a steel plate is fully released, and the good plate shape of the steel plate is ensured;
in the second step, the wave shape of the produced checkered plate is basically double-side wave or single-side wave, the middle wave is less, aiming at the characteristic, the roller shape of a working roller used by the unit is designed into a concave roller shape, the concavity is-0.04 mm, the rolling reduction of the edge part is increased by matching with the control of a negative bending roller, and the roller shape for repairing the flat plate is selected from a flat roller without concavity;
in the third step, the stress area of the patterned plate hyacinth bean is smaller, the tension is not set to be too large, otherwise the hyacinth bean is inclined and deformed along the rolling direction, meanwhile, the steel coil tightness can not reach the flat plate tightness due to the characteristics of the patterned plate, if the tension is set to be too large in the flattening process, the relative sliding of the upper contact surface and the lower contact surface, namely the unwinding phenomenon, easily occurs, the lower contact surface and the plane of the hyacinth bean have different degrees of contusion, and the setting range of the tension is determined through a plurality of experiments, wherein the unwinding tension is 50-70KN, the curling tension is 130-160KN, the unwinding tension during flat plate restoration is 100-180KN, and the curling tension is 160-200 KN;
in the fourth step, in order to prevent the flattening deformation of the checkered plate hyacinth beans caused by overlarge rolling reduction, rolling is carried out by adopting small rolling reduction, and the rolling force range is finally determined to be in 1050 plus 1800KN through multiple experiments;
in the fifth step, the checkered plate to be repaired is placed into a flattening unit, and the checkered plate is flattened at a low speed by using a working roller;
in the sixth step, the specification of the working roll for the flat line is phi 630/560 multiplied by 1780mm, when the working roll is used to a diameter that phi 570mm is close to the diameter of a scrapped roll, the working roll is influenced by the characteristics of the roll, the difficulty of adjusting the plate shape is increased when the flat plate is flat, the requirement of normal and genuine kilometers cannot be met, the roll needs to be changed in advance, the service cycle of the roll is shortened, the grinding frequency is increased, the operating rate of a unit set is easily influenced, the grinding cost is increased, in order to improve the utilization rate of the working roll, the working roll with the diameter reaching phi 570mm after grinding is re-paired and is changed into a special roll for the flat checkered plate, and the problems that the flat plate flattening capability is reduced, the grinding cost is increased and the like are effectively avoided.
Based on the above, the invention has the advantages that when the invention is used, the stable operation of the unit is ensured by selecting a low-speed curling mode; by selecting the working roller with smaller rolling force and the concave roller shape, the wave shape of the checkered plate is effectively improved on the premise of ensuring that hyacinth beans of the checkered plate are not flattened and deformed; according to the invention, the mode that the working roller to be scrapped is changed into the special roller for flattening the checkered plate is adopted, so that the problems that the efficiency of the working roller is gradually reduced, the grinding cost is increased and the like are effectively avoided.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A method for repairing the shape of a hot-rolled steel plate comprises the following steps: step one, selecting a working mode; step two, selecting a working roll; setting front and rear tension; step four, setting the reduction; step five, starting repairing; step six, recycling the waste roller; the method is characterized in that:
in the first step, firstly, the working mode of the unit is selected to be a leveling mode, the leveling four-roller mill adopts pressure closed-loop control, and meanwhile, the straightening unit is selected to be a mode that a motor is disengaged from a driven screw-down mode;
in the second step, the roll shape of the working roll used by the unit is designed into a concave roll shape, the concavity is-0.04 mm, and the edge rolling reduction is increased by matching with the control of a negative bending roll;
in the third step, the set range of the tension is determined through a plurality of experiments, wherein the uncoiling tension is 50-70KN, and the coiling tension is 130-160 KN;
in the fourth step, in order to prevent the flattening deformation of the checkered plate hyacinth beans caused by overlarge rolling reduction, rolling with small rolling reduction is adopted;
in the fifth step, the checkered plate to be repaired is placed into a flattening unit, and the checkered plate is flattened at a low speed by using a working roller;
in the sixth step, when the working roller is used to the diameter of phi 570mm close to the diameter of the scrapped roller, the roller needs to be replaced in advance, and the working roller which reaches phi 570mm after grinding is re-paired and is changed into a special roller for flattening the checkered plate.
2. The method for repairing a hot rolled steel sheet shape according to claim 1, characterized in that: in the first step, due to the characteristics of the checkered plate, certain particularity exists on the contact surface of the checkered plate and a leveling working roller in the rolling process, so that the whole vibration of the unit is large, the unit is required to be in a low-speed leveling mode in order to prevent the pipeline interface of the unit from loosening or collapsing and leaking oil due to the excessive vibration of the high-speed production unit, the speed of the unit is controlled to be less than or equal to 60m/min, and the speed of a flat plate repairing unit can reach 300 m/min.
3. The method for repairing a hot rolled steel sheet shape according to claim 1, characterized in that: in the second step, the wave shape of the produced checkered plate is basically double-side waves or single-side waves, the middle waves are less, and according to the characteristic, a concave roller is selected for the roller shape, and a flat roller without concavity is selected for the flat plate repairing roller shape.
4. The method for repairing the shape of a hot-rolled steel plate according to claim 1, characterized in that: in the third step, the stress area of the patterned plate hyacinth bean is small, the tension setting is not too large, otherwise the hyacinth bean is inclined and deformed along the rolling direction, meanwhile, the steel coil tightness can not reach the flat plate tightness due to the characteristics of the patterned plate, if the tension setting is too large in the leveling process, the relative sliding (i.e. loose rolling) phenomenon of the upper contact surface and the lower contact surface is easily caused, and the phenomenon of different degrees of contusion between the surface of the lower flat plate and the plane of the hyacinth bean is caused, wherein the uncoiling tension during flat plate repair is 100-180KN, and the curling tension is 160-200 KN.
5. The method for repairing a hot rolled steel sheet shape according to claim 1, characterized in that: in the fourth step, the small rolling reduction required by the rolling is finally determined to be within 1050 and 1800KN through a plurality of experiments.
6. The method for repairing the shape of a hot-rolled steel plate according to claim 1, characterized in that: in the sixth step, the specification of the working roll of the leveling line is phi 630/560 multiplied by 1780mm, when the working roll is used to phi 570mm and is close to the diameter of a scrapped roll, the working roll is influenced by the characteristics of the roll, the difficulty of adjusting the plate shape is increased when the plate is leveled, the requirement of normal just-produced kilometers cannot be met, the roll needs to be changed in advance, the service cycle of the roll is shortened, and the grinding frequency is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210273290.1A CN114618907A (en) | 2022-03-18 | 2022-03-18 | Method for repairing shape of hot rolled steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210273290.1A CN114618907A (en) | 2022-03-18 | 2022-03-18 | Method for repairing shape of hot rolled steel plate |
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| Publication Number | Publication Date |
|---|---|
| CN114618907A true CN114618907A (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210273290.1A Pending CN114618907A (en) | 2022-03-18 | 2022-03-18 | Method for repairing shape of hot rolled steel plate |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008272783A (en) * | 2007-04-27 | 2008-11-13 | Nippon Steel Corp | Shape control method in skin pass rolling |
| CN104525629A (en) * | 2014-12-25 | 2015-04-22 | 安阳钢铁股份有限公司 | Flattening method for hot rolling checkered plate of non-standard-thin specification |
| CN107626749A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | A kind of thin checkered plates levelling method |
| CN109092905A (en) * | 2018-08-14 | 2018-12-28 | 攀钢集团西昌钢钒有限公司 | A kind of levelling method for eliminating decorative pattern plunging breaker shape defect |
-
2022
- 2022-03-18 CN CN202210273290.1A patent/CN114618907A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008272783A (en) * | 2007-04-27 | 2008-11-13 | Nippon Steel Corp | Shape control method in skin pass rolling |
| CN104525629A (en) * | 2014-12-25 | 2015-04-22 | 安阳钢铁股份有限公司 | Flattening method for hot rolling checkered plate of non-standard-thin specification |
| CN107626749A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | A kind of thin checkered plates levelling method |
| CN109092905A (en) * | 2018-08-14 | 2018-12-28 | 攀钢集团西昌钢钒有限公司 | A kind of levelling method for eliminating decorative pattern plunging breaker shape defect |
Non-Patent Citations (1)
| Title |
|---|
| 李九岭等: "《热镀锌设备与工艺》", 冶金工业出版社, pages: 436 - 437 * |
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