CN112718874A - Method for reducing width and width marks during specification change of cold-rolled strip steel - Google Patents
Method for reducing width and width marks during specification change of cold-rolled strip steel Download PDFInfo
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- CN112718874A CN112718874A CN202011473121.XA CN202011473121A CN112718874A CN 112718874 A CN112718874 A CN 112718874A CN 202011473121 A CN202011473121 A CN 202011473121A CN 112718874 A CN112718874 A CN 112718874A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 137
- 239000010959 steel Substances 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 73
- 230000008859 change Effects 0.000 title abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 120
- 230000007704 transition Effects 0.000 claims abstract description 59
- 230000008569 process Effects 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 35
- 238000005507 spraying Methods 0.000 claims description 20
- 239000008367 deionised water Substances 0.000 claims description 11
- 229910021641 deionized water Inorganic materials 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 9
- 239000010960 cold rolled steel Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 14
- 238000003466 welding Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 5
- 238000005097 cold rolling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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Abstract
The invention discloses a method for reducing width and width marks of cold-rolled strip steel during specification change, belonging to the technical field of steel rolling; the method for reducing the width and the width marks of the cold-rolled strip steel during specification changing comprises the steps of replacing a roller when the strip steel to be rolled is changed from narrow to wide, then rolling a transition coil with the length of 800-1000 m, wherein in the rolling process of the transition coil, the friction coefficient of the surface of the strip steel is 0.07-0.12, and the rolling pressure is 180-220 t; the rolling kilometers and the rolling pressure of the width transition coil are reduced to reduce the width mark of the strip steel on the roll surface.
Description
Technical Field
The invention relates to the technical field of steel rolling control, in particular to a method for reducing wide and narrow marks when the specification of cold-rolled strip steel is changed.
Background
In the current cold rolling continuous hot galvanizing line, a finisher plays a very important key role, and due to the rapid development of the industries with higher galvanized sheet demand, such as current household appliances, automobile industry and the like, the demand of the galvanized sheet is increased, and the quality requirement of the galvanized sheet is also continuously increased, so that how to reduce the defects of the finisher becomes very important. The width mark on the galvanized sheet is one of the important defects existing in the current cold rolling process, and the generation is caused because when the production plan width is widened from narrow, the working roll needs to be replaced to avoid the generation of the width mark, and the width transition roll needs to be put into the widest plan roll. The roll changing mode can cause a large amount of wide and narrow printing degradation, does not use the popularization of cost reduction and efficiency improvement, and has bad influence on the economic benefit of a company.
At present, in the actual production process of a steel rolling mill, in order to reduce the generation of width marks in products, a mode of replacing a working roller at the widest position is often adopted, but the method sacrifices a transition roll in the front to ensure that the widest strip steel has no width marks, so that a large amount of width marks of the transition roll are degraded, the production efficiency is reduced, and the production cost is increased.
Therefore, how to degrade a large amount of wide and narrow prints is a problem which needs to be solved urgently at present; the patent with the patent name of a strip steel movable flattening device and a flattening method has the patent with the patent number of CN103357659A through retrieval, and discloses a strip steel flattening device and a flattening method, wherein the strip steel is installed on a 2# welding line detection device in front of a flattening machine and a 4# welding line detection device in back of the flattening machine in the running direction of the strip steel, the 2# welding line detection device and the 4# welding line detection device are both connected with a PLC control system, and the PLC control system is connected with a strip steel position detection device installed at the inlet of the flattening machine and a push-pull hydraulic cylinder installed on a strip steel moving device, so that the width and narrow marks in the strip steel rolling process can be reduced to a certain extent, but the device is high in transformation cost, and the effect of eliminating the width and narrow marks is limited in the existing roll changing process.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to provide a method for reducing width marks when the specification of a cold-rolled steel strip is changed, aiming at the technical problem that the width marks are difficult to remove in the cold rolling process in the prior art, and the technical problem that the width marks are difficult to remove is solved by changing the rolling parameters at a roller and controlling the rolling surface parameters.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a method for reducing width and width marks of a cold-rolled strip steel during specification changing, wherein a roller is replaced firstly in the process of changing the width of the strip steel to be rolled from narrow to wide, then a transition coil with the length of 800-1000 m is rolled, the friction coefficient of the surface of the strip steel is 0.07-0.12 in the process of rolling the transition coil, and the rolling pressure is 180-220 t.
Preferably, in the rolling process of the transition roll, the roll is sprayed with a finishing liquid, and the conductivity of the finishing liquid is 550-600 us/cm.
Preferably, after the rolling of the transition coil is finished, the wide strip is pre-rolled, and the rolling pressure is not less than 370t until the width mark disappears.
Preferably, the width difference between the narrow strip steel and the wide strip steel in the process of widening the strip steel from narrow to wide is not more than 200 mm.
Preferably, in the rolling process of the transition roll, the cleaning pressure of the polishing solution sprayed at the roller is 40-45 bar.
Preferably, in the transitional roll rolling process, the elongation is set to be 0.6% -0.7%.
Preferably, in the rolling process of the transition roll, the front tension of the strip steel at the roller is 45-50KN, and the rear tension of the strip steel is 50-55 KN.
Preferably, after the rolling of the transition roll is finished, the wide strip is pre-rolled, and deionized water is sprayed at the roller until the width mark disappears.
Preferably, after the rolling of the transition rolls is finished, the wide strip is pre-rolled, the front tension of the strip at the rolling rolls is 33-38KN, and the rear tension of the strip at the rolling rolls is 38-43KN until the width marks disappear.
The invention discloses a method for reducing width and width marks of cold-rolled strip steel during specification change, which comprises the following steps:
step one, roll changing
(1) Reducing the running speed of the strip steel in the heat treatment furnace before changing the rolls;
(2) carrying out roller replacement;
(3) after the roll replacement is finished, the roll creeps and then the frame is closed;
step two, rolling the transition coil
Rolling the transition coil, and spraying a finishing liquid at the roller;
step three, pre-rolling wide strip steel
Pre-rolling the wide strip steel, and spraying a finishing liquid at the roller;
the parameters in the steps are the parameters in the method for reducing the width and the width marks when the cold-rolled strip steel is changed into the specification.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the method for reducing the width and the width marks of the cold-rolled strip steel during specification changing comprises the steps of replacing a roller when the strip steel to be rolled is changed from narrow to wide, then rolling a transition coil with the length of 800-1000 m, wherein in the rolling process of the transition coil, the friction coefficient of the surface of the strip steel is 0.07-0.12, and the rolling pressure is 180-220 t; the rolling kilometers and the rolling pressure of the width transition coil are reduced to reduce the width mark of the strip steel on the roll surface.
(2) According to the method for reducing the width and the narrow marks of the cold-rolled strip steel during specification changing, in the rolling process of the transition roll, the burnishing liquid is sprayed at the roller, the conductivity of the burnishing liquid is 550-600 us/cm, the burnishing liquid can be mixed to reduce the friction coefficient between the strip steel and the roller, so that the rolling force is reduced, the reduction of the rolling force can reduce the groove depth of the roller caused by the friction of the strip steel, and the width and the narrow marks are greatly reduced.
(3) The invention discloses a method for reducing width marks when a cold-rolled strip steel is changed into specifications, which is characterized in that after rolling of a transition coil is finished, a wide strip steel is pre-rolled, the rolling pressure is not less than 370t until the width marks disappear, and the degradation amount of the width marks of the strip steel is reduced by improving the rolling force to grind off grooves on the surface of a roller as fast as possible.
Drawings
FIG. 1 is a diagram of a strip steel object produced by the method for reducing width and width marks during cold rolling of the strip steel according to the invention;
FIG. 2 is a schematic representation of a strip produced by the method of comparative example 3.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention. Meanwhile, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description only, and are not used to limit the implementable scope, and the relative relationship changes or adjustments may be considered to be within the implementable scope of the present invention without substantial technical changes; in addition, the embodiments of the present invention are not independent of each other, but may be combined.
According to the method for reducing the width mark of the cold-rolled strip steel during specification change, when the process of producing the narrow strip steel needs to be transferred to the process of producing the wide strip steel in the production process of a steel rolling mill, a roller needs to be replaced, and the width difference between the narrow strip steel and the wide strip steel cannot exceed 200mm in the process of changing the narrow strip steel to the wide strip steel.
The specific production process comprises the following steps:
step one, roll changing
(1) After the production of the narrow strip steel is finished, stopping the machine at the position of a roller at the welding line of the narrow strip steel, and preparing to replace the roller; reducing the running speed of the strip steel in the heat treatment furnace before changing the rolls, and adjusting the running speed to 80-85 m/min;
(2) confirming that the roller frame acts normally and the control signal is normal, and replacing the roller;
(3) after the roller is replaced, the roller creeps at the speed of 30m/min, and then the frame is closed to avoid the generation of closed marks;
step two, rolling the transition coil
The method is characterized in that a transition coil with the rolling length of 800-1000 m is rolled, in the rolling process of the transition coil, the friction coefficient of the surface of the strip steel is 0.07-0.12, the rolling pressure is 180-220 t, the front tension of the strip steel at a roller is 45-50KN, the rear tension of the strip steel is 50-55KN, the elongation is set to be 0.6% -0.7%, under the conditions of the elongation and the tension, the reduction of the rolling force is facilitated, and the reduction of grooves of a transition piece on the roller is facilitated.
Simultaneously spraying a finishing liquid at the roller; in the process of rolling the transition roll, spraying a finishing liquid at the position of a roller, wherein the conductivity of the finishing liquid is 550-600 us/cm; after the finishing liquid is mixed, the friction coefficient between the strip steel and the roller can be reduced, so that the rolling force is reduced, the reduction of the rolling force can reduce the depth of a groove caused by the friction of the roller by the strip steel, and the width marks are greatly reduced. The cleaning pressure of the polishing solution sprayed at the roller is 40-45 bar; the lubricating function can be achieved under pressure, the friction force between the roller and the strip steel is reduced, and scrap iron generated in the rolling process can be removed.
Step three, pre-rolling wide strip steel
And pre-rolling the wide strip steel, wherein the length of the pre-rolled strip steel is 400-600 m, the rolling pressure is not less than 370t, the front tension of the strip steel at a roller is 33-38KN, and the rear tension of the strip steel at the roller is 38-43KN until the width mark disappears. And simultaneously spraying deionized water at the roller.
To further illustrate the technical solutions of the present invention, the following preferred embodiments of the present invention are described with reference to examples, but it should be understood that the descriptions are only for further illustrating the features and advantages of the present invention and are not to be construed as limiting the claims of the present invention.
Example 1
In the method for reducing the width mark of the cold-rolled steel strip during the specification change, when the process of producing the narrow strip needs to be transferred to the process of producing the wide strip in the production process of a steel rolling mill, the rolls need to be replaced, in the embodiment, the width of the narrow strip is 1000mm, and the width of the wide strip is 1200 mm.
The specific production process comprises the following steps:
step one, roll changing
(1) After the production of the narrow strip steel is finished, stopping the machine at the position of a roller at the welding line of the narrow strip steel, and preparing to replace the roller; before the roll changing, the running speed of the strip steel in the heat treatment furnace is reduced, and the running speed is adjusted to 85 m/min;
(2) confirming that the roller frame acts normally and the control signal is normal, and replacing the roller;
(3) after the roller is replaced, the roller creeps at the speed of 30m/min, and then the frame is closed to avoid the generation of closed marks;
step two, rolling the transition coil
In the process of rolling the transition coil, the front tension and the rear tension of the strip steel at the roller are 45KN and 50KN respectively, and the elongation is set to be 0.6 percent. Simultaneously spraying a finishing liquid at the roller; in the process of rolling the transition roll, spraying a finishing liquid at the roller, wherein the conductivity of the finishing liquid in the embodiment is 550-560 us/cm, the friction coefficient of the surface of the strip steel is controlled to be 0.11-0.12, and the cleaning pressure of the finishing liquid sprayed at the roller is 40 bar; in the embodiment, the rolling pressure is 180-185 t, and the rolling length of the transition coil is 1000 m.
Step three, pre-rolling wide strip steel
Pre-rolling the wide strip steel, wherein in the pre-rolling process of the embodiment, the rolling pressure is 370-375 t, the front tension of the strip steel at a roller is 33KN, and the rear tension of the strip steel at the roller is 38KN until the width and the width are eliminated; and simultaneously spraying deionized water at the roller. The length of the pre-rolled strip in this example is 600 m.
Example 2
In the method for reducing the width mark of the cold-rolled steel strip during the specification change, when the process of producing the narrow strip needs to be transferred to the process of producing the wide strip in the production process of a steel rolling mill, the rolls need to be replaced, in the embodiment, the width of the narrow strip is 1000mm, and the width of the wide strip is 1200 mm.
The specific production process comprises the following steps:
step one, roll changing
(1) After the production of the narrow strip steel is finished, stopping the machine at the position of a roller at the welding line of the narrow strip steel, and preparing to replace the roller; reducing the running speed of the strip steel in the heat treatment furnace before changing the rolls, and adjusting the running speed to 80-85 m/min;
(2) confirming that the roller frame acts normally and the control signal is normal, and replacing the roller;
(3) after the roller is replaced, the roller creeps at the speed of 30m/min, and then the frame is closed to avoid the generation of closed marks;
step two, rolling the transition coil
In the process of rolling the transition coil, the front tension and the rear tension of the strip steel at the roller are 47KN and 53KN respectively, and the elongation is set to be 0.65 percent. Simultaneously spraying a finishing liquid at the roller; in the process of rolling the transition roll, a roll is sprayed with a finishing liquid, the conductivity of the finishing liquid in the embodiment is 570-580 us/cm, the friction coefficient of the surface of the strip steel is controlled to be 0.09-0.10, and the cleaning pressure of the finishing liquid sprayed on the roll is 43 bar; in the embodiment, the rolling pressure is 200-205 t, and the rolling length of the transition coil is 900 m.
Step three, pre-rolling wide strip steel
Pre-rolling the wide strip steel, wherein in the pre-rolling process of the embodiment, the rolling pressure is 400-405 t, the front tension of the strip steel at a roller is 35KN, and the rear tension of the strip steel at the roller is 40KN until the width and the width are eliminated; and simultaneously spraying deionized water at the roller. The length of the pre-rolled strip in this example is 500 m.
Example 3
In the method for reducing the width mark of the cold-rolled steel strip during the specification change, when the process of producing the narrow strip needs to be transferred to the process of producing the wide strip in the production process of a steel rolling mill, the rolls need to be replaced, in the embodiment, the width of the narrow strip is 1000mm, and the width of the wide strip is 1200 mm.
The specific production process comprises the following steps:
step one, roll changing
(1) After the production of the narrow strip steel is finished, stopping the machine at the position of a roller at the welding line of the narrow strip steel, and preparing to replace the roller; before the roll changing, the running speed of the strip steel in the heat treatment furnace is reduced, and the running speed is adjusted to 85 m/min;
(2) confirming that the roller frame acts normally and the control signal is normal, and replacing the roller;
(3) after the roller is replaced, the roller creeps at the speed of 30m/min, and then the frame is closed to avoid the generation of closed marks;
step two, rolling the transition coil
In the process of rolling the transition coil, the front tension and the rear tension of the strip steel at the roller are respectively 50KN and 55KN, and the elongation is set to be 0.7 percent. Simultaneously spraying a finishing liquid at the roller; in the process of rolling the transitional rolls, a finishing liquid is sprayed at the rolls, the conductivity of the finishing liquid in the embodiment is 590-600 us/cm, the friction coefficient of the surface of the strip steel is controlled to be 0.07-0.08, and the cleaning pressure of the finishing liquid sprayed at the rolls is 45 bar; in the embodiment, the rolling pressure is 215-220 t, and the rolling length of the transition coil is 800 m.
Step three, pre-rolling wide strip steel
Pre-rolling the wide strip steel, wherein in the pre-rolling process of the embodiment, the rolling pressure is 450-455 t, the front tension of the strip steel at a roller is 38KN, and the rear tension of the strip steel at the roller is 43KN until the width and the width are eliminated; and simultaneously spraying deionized water at the roller. The length of the pre-rolled strip in this example is 400 m.
Comparative example 1
The width of the narrow strip steel of the comparative example is 1000mm, and the width of the wide strip steel is 1200 mm. The specific production process comprises the following steps:
step one, roll changing
(1) After the production of the narrow strip steel is finished, stopping the machine at the position of a roller at the welding line of the narrow strip steel, and preparing to replace the roller; before the roll changing, the running speed of the strip steel in the heat treatment furnace is reduced, and the running speed is adjusted to 85 m/min;
(2) confirming that the roller frame acts normally and the control signal is normal, and replacing the roller;
(3) after the roller is replaced, the roller creeps at the speed of 30m/min, and then the frame is closed to avoid the generation of closed marks;
step two, rolling the transition coil
In the process of rolling the transitional coil, the front tension of the strip steel at the roller is 45-50KN, the rear tension is 50-55KN, and the elongation is set to be 0.6-0.7%. Spraying deionized water at the roller; in the process of rolling the transition roll, deionized water is sprayed at the roller, the deionized water is used in the comparative example, the friction coefficient of the surface of the strip steel is controlled to be 0.15-0.16, and the cleaning pressure of the polishing solution sprayed at the roller is 40 bar; in the comparative example, the rolling pressure is 180-185 t, and the rolling length of the transition coil is 1000 m.
Step three, pre-rolling wide strip steel
Pre-rolling the wide strip steel, wherein in the pre-rolling process of the comparative example, the rolling pressure is 370-375 t, the front tension of the strip steel at a roller is 33KN, and the rear tension of the strip steel at the roller is 38KN until the width and the width are eliminated; and simultaneously spraying deionized water at the roller. The length of the pre-rolled strip in this example is 1200 m.
Comparative example 2
The width of the narrow strip steel of the comparative example is 1000mm, and the width of the wide strip steel is 1200 mm. . The specific production process comprises the following steps:
step one, roll changing
(1) After the production of the narrow strip steel is finished, stopping the machine at the position of a roller at the welding line of the narrow strip steel, and preparing to replace the roller; before the roll changing, the running speed of the strip steel in the heat treatment furnace is reduced, and the running speed is adjusted to 85 m/min;
(2) confirming that the roller frame acts normally and the control signal is normal, and replacing the roller;
(3) after the roller is replaced, the roller creeps at the speed of 30m/min, and then the frame is closed to avoid the generation of closed marks;
step two, rolling the transition coil
In the process of rolling the transition coil, the front tension and the rear tension of the strip steel at the roller are 47KN and 53KN respectively, and the elongation is set to be 0.65 percent. Simultaneously spraying a finishing liquid at the roller; in the process of rolling the transition roll, the roll is sprayed with the finishing liquid, the conductivity of the finishing liquid used in the comparative example is 300-310 us/cm, the friction coefficient of the surface of the strip steel is controlled to be 0.13-0.14, and the cleaning pressure of the finishing liquid sprayed on the roll is 43 bar; in the comparative example, the rolling pressure is 200-205 t, and the rolling length of the transition coil is 900 m.
Step three, pre-rolling wide strip steel
Pre-rolling the wide strip steel, wherein in the pre-rolling process of the comparative example, the rolling pressure is 400-405 t, the front tension of the strip steel at a roller is 35KN, and the rear tension of the strip steel at the roller is 40KN until the width and the width are eliminated; and simultaneously spraying deionized water at the roller. The length of the pre-rolled strip in this example is 1000 m.
Comparative example 3
In the method for reducing the width mark of the cold-rolled steel strip in the specification changing process, when the process of producing the narrow strip steel needs to be transferred to the process of producing the wide strip steel in the production process of a steel rolling mill, the roller needs to be replaced, and in the comparison example, the width of the narrow strip steel is 1000mm, and the width of the wide strip steel is 1200 mm.
The specific production process comprises the following steps:
step one, roll changing
(1) After the production of the narrow strip steel is finished, stopping the machine at the position of a roller at the welding line of the narrow strip steel, and preparing to replace the roller; before the roll changing, the running speed of the strip steel in the heat treatment furnace is reduced, and the running speed is adjusted to 85 m/min;
(2) confirming that the roller frame acts normally and the control signal is normal, and replacing the roller;
(3) after the roller is replaced, the roller creeps at the speed of 30m/min, and then the frame is closed to avoid the generation of closed marks;
step two, rolling the transition coil
In the process of rolling the transition coil, the front tension and the rear tension of the strip steel at the roller are 45KN and 50KN respectively, and the elongation is set to be 0.6 percent. Simultaneously spraying a finishing liquid at the roller; in the process of rolling the transition roll, spraying a finishing liquid at the roller, wherein the conductivity of the finishing liquid in the embodiment is 550-560 us/cm, the friction coefficient of the surface of the strip steel is controlled to be 0.11-0.12, and the cleaning pressure of the finishing liquid sprayed at the roller is 40 bar; in the comparative example, the rolling pressure is 180-185 t, and the rolling length of the transition coil is 1000 m.
The comparative example has no pre-rolling process, and the product diagram is shown in fig. 2.
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.
More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, combined, e.g., between various embodiments, adapted and/or substituted, as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.
Claims (10)
1. A method for reducing width marks of cold-rolled strip steel during specification changing is characterized in that in the process that the strip steel to be rolled is changed from narrow to wide, a roller is replaced, then a transition coil with the length of 800-1000 m is rolled, in the process of rolling the transition coil, the friction coefficient of the surface of the strip steel is 0.07-0.12, and the rolling pressure is 180-220 t.
2. The method for reducing the width and the width marks of the cold-rolled steel strip during the gauge changing process as claimed in claim 1, wherein the roll is sprayed with a finishing liquid during the rolling process of the transition roll, and the conductivity of the finishing liquid is 550-600 us/cm.
3. The method of claim 1, wherein the wide strip is pre-rolled after the transition roll rolling is completed at a rolling pressure of not less than 370t until the width mark disappears.
4. The method of claim 1, wherein the difference in width between the narrow strip and the wide strip is no greater than 200mm during the cold strip rolling from narrow to wide.
5. The method for reducing the width and the width of the cold-rolled steel strip during the specification changing process as claimed in claim 1, wherein the cleaning pressure of the polishing solution sprayed on the roller during the rolling process of the transition roll is 40-45 bar.
6. The method of claim 1, wherein the elongation is set to 0.6-0.7% during the transition roll rolling.
7. The method for reducing the width and the width of the cold-rolled steel strip during the gauge changing process as claimed in claim 1, wherein the front tension of the steel strip at the roller is 45-50KN and the rear tension of the steel strip at the roller is 50-55KN during the rolling process of the transition roll.
8. The method of claim 2, wherein the wide strip is pre-rolled after the transition roll is rolled, and deionized water is sprayed onto the rolls until the width marks disappear.
9. The method of claim 2, wherein the wide strip is pre-rolled after the transition roll rolling is completed, and the front tension of the strip at the rolls is 33-38KN and the rear tension is 38-43KN until the width mark disappears.
10. A method for reducing width and width marks when the specification of cold-rolled strip steel is changed is characterized by comprising the following steps:
step one, roll changing
(1) Reducing the running speed of the strip steel in the heat treatment furnace before changing the rolls;
(2) carrying out roller replacement;
(3) after the roll replacement is finished, the roll creeps and then the frame is closed;
step two, rolling the transition coil
Rolling the transition coil, and spraying a finishing liquid at the roller;
step three, pre-rolling wide strip steel
Pre-rolling the wide strip steel, and spraying a finishing liquid at the roller;
the parameters in the above steps are the parameters of the method for reducing the width and the width marks when the cold-rolled steel strip is subjected to gauge reduction according to any one of claims 1 to 9.
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| CN202011473121.XA CN112718874B (en) | 2020-12-15 | 2020-12-15 | Method for reducing width marks when cold-rolled strip steel changes specification |
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| CN112718874B CN112718874B (en) | 2024-08-02 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001239301A (en) * | 2000-02-24 | 2001-09-04 | Sumitomo Metal Ind Ltd | Method for preventing one-sided overdraft in skin pass rolling of metal in coil |
| KR20030017014A (en) * | 2001-08-23 | 2003-03-03 | 주식회사 포스코 | Apparatus for improving the form of cold-rolled strip using supporting rolls |
| CN102107217A (en) * | 2009-12-25 | 2011-06-29 | 鞍钢股份有限公司 | Method for eliminating calibration print of working roll of rolling mill |
| CN102430578A (en) * | 2011-08-25 | 2012-05-02 | 郑州市华驰薄板科技有限公司 | Cold-rolled strip steel flattening device and cold-rolled strip steel cross break eliminating method |
| CN103357659A (en) * | 2012-03-27 | 2013-10-23 | 上海梅山钢铁股份有限公司 | Mobile-type strip steel flattening device and mobile-type strip steel flattening method |
| TW201540386A (en) * | 2014-04-28 | 2015-11-01 | China Steel Corp | Method for eliminating edge mark of continuous cold rolling mill |
| CN105234172A (en) * | 2015-09-25 | 2016-01-13 | 江苏省沙钢钢铁研究院有限公司 | Production method for eliminating surface color difference of cold-rolled sheet |
| CN107303587A (en) * | 2016-04-25 | 2017-10-31 | 江苏财发铝业股份有限公司 | A kind of specular aluminium and aluminum alloy checkered plate, the production method of band |
| CN107488782A (en) * | 2016-06-13 | 2017-12-19 | 上海梅山钢铁股份有限公司 | A kind of galvanizing Horizental annealer furnace rolls face foreign matter sweep-out method |
| CN108213088A (en) * | 2016-12-15 | 2018-06-29 | 上海梅山钢铁股份有限公司 | The control method of smooth flow quantity in a kind of cold-rolled steel sheet wet jetting piles operation of rolling |
-
2020
- 2020-12-15 CN CN202011473121.XA patent/CN112718874B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001239301A (en) * | 2000-02-24 | 2001-09-04 | Sumitomo Metal Ind Ltd | Method for preventing one-sided overdraft in skin pass rolling of metal in coil |
| KR20030017014A (en) * | 2001-08-23 | 2003-03-03 | 주식회사 포스코 | Apparatus for improving the form of cold-rolled strip using supporting rolls |
| CN102107217A (en) * | 2009-12-25 | 2011-06-29 | 鞍钢股份有限公司 | Method for eliminating calibration print of working roll of rolling mill |
| CN102430578A (en) * | 2011-08-25 | 2012-05-02 | 郑州市华驰薄板科技有限公司 | Cold-rolled strip steel flattening device and cold-rolled strip steel cross break eliminating method |
| CN103357659A (en) * | 2012-03-27 | 2013-10-23 | 上海梅山钢铁股份有限公司 | Mobile-type strip steel flattening device and mobile-type strip steel flattening method |
| TW201540386A (en) * | 2014-04-28 | 2015-11-01 | China Steel Corp | Method for eliminating edge mark of continuous cold rolling mill |
| CN105234172A (en) * | 2015-09-25 | 2016-01-13 | 江苏省沙钢钢铁研究院有限公司 | Production method for eliminating surface color difference of cold-rolled sheet |
| CN107303587A (en) * | 2016-04-25 | 2017-10-31 | 江苏财发铝业股份有限公司 | A kind of specular aluminium and aluminum alloy checkered plate, the production method of band |
| CN107488782A (en) * | 2016-06-13 | 2017-12-19 | 上海梅山钢铁股份有限公司 | A kind of galvanizing Horizental annealer furnace rolls face foreign matter sweep-out method |
| CN108213088A (en) * | 2016-12-15 | 2018-06-29 | 上海梅山钢铁股份有限公司 | The control method of smooth flow quantity in a kind of cold-rolled steel sheet wet jetting piles operation of rolling |
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