CN114210737A - Method for reducing plate type defects of dry type temper mill - Google Patents
Method for reducing plate type defects of dry type temper mill Download PDFInfo
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- CN114210737A CN114210737A CN202111286346.9A CN202111286346A CN114210737A CN 114210737 A CN114210737 A CN 114210737A CN 202111286346 A CN202111286346 A CN 202111286346A CN 114210737 A CN114210737 A CN 114210737A
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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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- 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
- 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
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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
- B21B2263/00—Shape of product
- B21B2263/04—Flatness
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Abstract
The invention relates to the technical field of planishers, and discloses a method for reducing plate type defects of a dry type planisher, which comprises the following steps: 1) material returning and leveling: for the strip steel with poor plate shape after being leveled; 2) material optimization: texturing the tension roller and spraying a wear-resistant material; 3) structure optimization: adjusting the dynamic state of the roll gap; 4) preliminary tests: and (3) correcting the standard elongation by adopting a stainless steel band with the thickness of 2-16mm, controlling the standard elongation to be 0.5-2.0%, feeding the steel band into a flattening machine for a flattening test, and then judging the yield of the steel band by observing the steel band after the test. According to the method for reducing the plate type defects of the dry type temper mill, the defective product rate of the steel belt in the leveling process is reduced by implementing a material returning and re-leveling system, so that an operator can repeatedly adjust and test the steel belt according to the flatness of the steel belt when carrying out a preliminary test, the flatness of the steel belt after being leveled is improved, and the effect of improving the yield is achieved.
Description
Technical Field
The invention relates to the technical field of planishers, in particular to a method for reducing plate type defects of a dry type planisher.
Background
The stainless steel product is widely applied to industries such as building decoration, rail transit, catering kitchenware, deep drawing products, electronic components and the like due to good physical properties, weldability and corrosion resistance, and has the characteristics of attractiveness and durability. In the modern society, with the increasing demand of people for good living, the consumption of stainless steel by Chinese people is steadily increased, and meanwhile, the demand on the quality of stainless steel products is gradually improved, so that the stainless steel products are promoted to develop towards high standard and high quality.
For example, the method for eliminating the strip-shaped roll mark defect of the online leveler is proposed in chinese invention CN 113500114 a, when the online leveler works, the strip steel passes through the online leveler from left to right, the upper leveling roll is lowered to the rolling line holding position, and the lower leveling roll is lifted upwards until contacting the strip steel and providing the rolling force. The strip steel passes through the upper leveling roller and the lower leveling roller, the anti-wrinkle roller upwards jacks the strip steel to keep the strip steel stable and not to shake, all rollers of an online leveling machine system keep high-speed synchronous motion along with the strip steel in the running process, and reach the flat plate type and bright stainless steel 2B surface according to set process parameters, and meanwhile, the strip steel yield platform can be eliminated to improve the mechanical property, but the flatness of the existing leveling machine in the steel production process has defects, so that a method for reducing the plate type defects of a dry type leveling machine is provided to solve the problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for reducing plate type defects of a dry type temper mill, which has the advantages of high yield and the like and solves the problem of low yield.
(II) technical scheme
In order to achieve the purpose of high yield, the invention provides the following technical scheme: a method of reducing plate defects in a dry leveler, comprising the steps of:
1) material returning and leveling: for the strip steel with poor plate shape after being leveled, the steel coil with wave shape needs to be leveled again by selecting small elongation, and material returning and re-leveling need to be carried out in time if found in the following procedures;
2) material optimization: the tension roller is required to be roughened, the wear-resistant material is sprayed, and the tension roller is required to be replaced periodically, so that the tension roller can be prevented from slipping;
3) structure optimization: the method comprises the steps of dynamically adjusting roll gaps, reducing the transverse thickness difference and the surface unevenness of a hot rolled plate, optimizing a target curve of a rolling mill shape meter, improving the control capability of a thin strip shape, optimizing an annealing process of the thin strip, reducing the bonding of strip steel, controlling the leveling elongation, changing the indirect measurement of a tension roll to the measurement of laser according to the measurement of a system, changing the leveling operation mode and improving the control capability of the strip steel wave shape;
4) preliminary tests: and (3) correcting the standard elongation by adopting a stainless steel band with the thickness of 2-16mm, controlling the standard elongation to be 0.5-2.0%, feeding the steel band into a flattening machine for a flattening test, and then judging the yield of the steel band by observing the steel band after the test.
Preferably, in the replacement cycle of the tension roller in the step 2), the tension roller should be replaced within 2-3 years when the thickness of the steel material is 2-8mm, and the tension roller should be replaced within 1-2 years when the thickness of the steel material is 8-16 mm.
Preferably, in the annealing process in the step 2), the annealing temperature should be controlled at 900-1000 ℃.
Preferably, the standard elongation rate in the step 4) is more than 0.5% when the thickness of the stainless steel strip is 2-8 mm.
Preferably, the standard elongation in the step 4) is less than 0.5% when the thickness of the stainless steel strip is 8-16 mm.
Preferably, the standard elongation in the step 4) is more than 1.0% when the thickness of the stainless steel strip is 2-16 mm.
Preferably, the rotation speed of the uncoiler in the temper mill in the step 4) when the stainless steel strip is tested is 400-800r/min, the diameter of the winding drum of the uncoiler is 500-700mm, and the power of the uncoiler is 130-135 kw.
Preferably, the rotation speed of the inlet roller set in the temper mill in the step 4) when the stainless steel strip is tested is 500-1200r/min, the power of the inlet roller set is 100-120kw, the rotation speed of the outlet roller set is 500-1400r/min, and the power of the outlet roller set is 80-100 kw.
Preferably, the rotation speed of the main machine in the temper mill in the step 4) when the stainless steel strip is tested is 500-1500r/min, the power of the main machine is 150-170kw, and the reduction speed of the main machine is 0.05-0.50 mm/s.
(III) advantageous effects
Compared with the prior art, the invention provides a method for reducing plate type defects of a dry type temper mill, which has the following beneficial effects:
according to the method for reducing the plate type defects of the dry type temper mill, the material returning and re-leveling system is implemented, so that the process that an operator conducts repeated tests on a steel belt is achieved, bad steel belts are leveled again, the defective product rate of the steel belt in the leveling process is reduced, and through material and structure optimization, the operator can conduct repeated adjustment and test according to the flatness of the steel belt when conducting preliminary tests, the flatness of the steel belt after leveling is improved, and the effect of improving the yield is achieved.
Drawings
FIG. 1 is a schematic flow chart 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 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.
The first embodiment is as follows:
a method of reducing plate defects in a dry leveler, comprising the steps of:
1) material returning and leveling: for the strip steel with poor plate shape after being leveled, the steel coil with wave shape needs to be leveled again by selecting small elongation, and as found in the following procedures, material returning and re-leveling need to be carried out in time, and the replacement period of the tension roller needs to be changed within 2 years according to the thickness of the steel material being 2mm, and the replacement period of the tension roller needs to be changed within 1 year when the thickness of the steel material being 8 mm;
2) material optimization: the tension roller is required to be roughened, the wear-resistant material is sprayed, and the tension roller is required to be replaced periodically, so that the tension roller can be prevented from slipping;
3) structure optimization: the method comprises the steps of dynamically adjusting roll gaps, reducing the transverse thickness difference and the surface unevenness of a hot rolled plate, optimizing a target curve of a rolling mill shape meter, improving the control capability of a thin strip shape, optimizing an annealing process of the thin strip, controlling the annealing temperature to be 900 ℃, reducing the adhesion of strip steel, controlling the leveling elongation rate, changing the indirect measurement of a tension roll to the measurement of laser according to the system measurement, and simultaneously changing the leveling operation mode to improve the control capability of the strip steel wave shape;
4) preliminary tests: correcting standard elongation by adopting a stainless steel band with the thickness of 2mm, controlling the standard elongation at 0.5 percent, controlling the standard elongation at more than 0.5 percent when the stainless steel band is 2mm, controlling the standard elongation at less than 0.5 percent when the stainless steel band is 8mm, controlling the standard elongation at more than 1.0 percent when the stainless steel band is 2mm, testing by adopting different corrected standard elongations according to steel materials with different thicknesses, feeding the steel band into a flattening machine for flattening test, judging the yield of the steel band by observing the steel band after the test, controlling the rotating speed of an uncoiler in the flattening machine to be 400r/min, the diameter of a winding drum of the uncoiler to be 500mm, the power of the uncoiler to be 130kw, the rotating speed of an inlet roller set in the flattening machine to be 500r/min, the power of the inlet roller set to be 100kw, and the rotating speed of an outlet roller set to be 500r/min when the stainless steel band is tested, the power of the outgoing roller group is 80kw, when a stainless steel strip is tested, the rotating speed of a main machine in a temper mill is 500r/min, the power of the main machine is 150kw, the pressing speed of the main machine is 0.05mm/s, the layout of an interface pipeline in a gas pipe network needs to be changed in the process of the steel strip leveling test, the pipe diameter of the pipeline is improved, the monitoring of a gas main pipe pressure reducing valve is strengthened, and an inspection system of gas pressure and heat value is formulated, after the above measures are carried out, the defective rate of the plate shape is reduced, but in the aspect of improving the plate shape, the following work needs to be prepared, in the process of rolling or leveling the steel strip, in order to improve the friction coefficient between the steel strip layers and avoid the phenomenon of wrong layer scratch caused by slipping, a texturing roller can be adopted for operation, and managers of a cold rolling factory need to regularly inspect and maintain each machine, the equipment that discovery ageing phenomenon is serious should be changed, especially rubber sleeve, because it can leave over the greasy dirt in inside and outside two sides at the operation in-process, so need carry out regular cleaning process, the reel need refuel in operation process simultaneously, so the grease of reel is clear away through continuous harmomegathus after the operation is accomplished, carries out the sleeve installation again after guaranteeing clean to statistics is carried out to rubber sleeve's life, confirms best change cycle.
Example two:
a method of reducing plate defects in a dry leveler, comprising the steps of:
1) material returning and leveling: for the strip steel with poor plate shape after being leveled, the steel coil with wave shape needs to be leveled again by selecting small elongation, and as found in the following procedures, material returning and re-leveling need to be carried out in time, and the replacement period of the tension roller needs to be changed within 2.5 years when the thickness of the steel is 6mm, and the replacement period of the tension roller needs to be changed within 1.5 years when the thickness of the steel is 12 mm;
2) material optimization: the tension roller is required to be roughened, the wear-resistant material is sprayed, and the tension roller is required to be replaced periodically, so that the tension roller can be prevented from slipping;
3) structure optimization: the method comprises the steps of dynamically adjusting roll gaps, reducing the transverse thickness difference and the surface unevenness of a hot rolled plate, optimizing a target curve of a rolling mill shape meter, improving the control capability of a thin strip shape, optimizing an annealing process of the thin strip, controlling the annealing temperature to be 950 ℃, reducing the adhesion of strip steel, controlling the leveling elongation rate, changing the indirect measurement of a tension roll to the measurement of laser according to the system measurement, and simultaneously changing the leveling operation mode to improve the control capability of the strip steel wave shape;
4) preliminary tests: correcting standard elongation by adopting a stainless steel band with the thickness of 9mm, controlling the standard elongation to be 1.25%, controlling the standard elongation to be more than 0.5% when the stainless steel band is 5mm, controlling the standard elongation to be less than 0.5% when the stainless steel band is 12mm, controlling the standard elongation to be more than 1.0% when the stainless steel band is 9mm, testing by adopting different corrected standard elongations according to steel materials with different thicknesses, feeding the steel band into a flattening machine for flattening test, judging the yield of the steel band by observing the steel band after the test, controlling the rotating speed of an uncoiler in the flattening machine to be 600r/min, the diameter of a winding drum of the uncoiler to be 600mm, the power of the uncoiler to be 132kw, controlling the rotating speed of an inlet roller set in the flattening machine to be 850r/min, controlling the power of the inlet roller set to be 110kw, and controlling the rotating speed of an outlet roller set to be 850r/min when the stainless steel band is tested, the power of the outgoing roller group is 90kw, when a stainless steel strip is tested, the rotating speed of a main machine in a temper mill is 1000r/min, the power of the main machine is 165kw, the pressing speed of the main machine is 1.25mm/s, the layout of an interface pipeline in a gas pipe network needs to be changed in the process of the steel strip leveling test, the pipe diameter of the pipeline is improved, the monitoring of a gas main pipe pressure reducing valve is strengthened, and an inspection system of gas pressure and heat value is formulated, after the above measures are carried out, the defective rate of the plate shape is reduced, but in the aspect of improving the plate shape, the following work needs to be prepared, in the process of rolling or leveling the steel strip, in order to improve the friction coefficient between the steel strip layers and avoid the phenomenon of wrong layer scratch caused by slipping, a texturing roller can be adopted for operation, and managers of a cold rolling factory need to regularly inspect and maintain each machine, the equipment that discovery ageing phenomenon is serious should be changed, especially rubber sleeve, because it can leave over the greasy dirt in inside and outside two sides at the operation in-process, so need carry out regular cleaning process, the reel need refuel in operation process simultaneously, so the grease of reel is clear away through continuous harmomegathus after the operation is accomplished, carries out the sleeve installation again after guaranteeing clean to statistics is carried out to rubber sleeve's life, confirms best change cycle.
Example three:
a method of reducing plate defects in a dry leveler, comprising the steps of:
1) material returning and leveling: for the strip steel with poor plate shape after being leveled, the steel coil with wave shape needs to be leveled again by selecting small elongation, and as found in the following procedures, material returning and re-leveling need to be carried out in time, the replacement period of the tension roller needs to be replaced within 3 years according to the thickness of the steel material being 8mm, and the replacement period of the tension roller needs to be replaced within 2 years when the thickness of the steel material being 16 mm;
2) material optimization: the tension roller is required to be roughened, the wear-resistant material is sprayed, and the tension roller is required to be replaced periodically, so that the tension roller can be prevented from slipping;
3) structure optimization: the method comprises the steps of dynamically adjusting roll gaps, reducing the transverse thickness difference and the surface unevenness of a hot rolled plate, optimizing a target curve of a rolling mill shape meter, improving the control capability of a thin strip shape, optimizing an annealing process of the thin strip, controlling the annealing temperature to be 1000 ℃, reducing the adhesion of strip steel, controlling the leveling elongation rate, changing the indirect measurement of a tension roll to the measurement of laser according to the system measurement, and simultaneously changing the leveling operation mode to improve the control capability of the strip steel wave shape;
4) preliminary tests: correcting standard elongation by adopting a stainless steel band with the thickness of 16mm, controlling the standard elongation to be 2.0 percent, controlling the standard elongation to be more than 0.5 percent when the stainless steel band is 8mm, controlling the standard elongation to be less than 0.5 percent when the stainless steel band is 16mm, controlling the standard elongation to be more than 1.0 percent when the stainless steel band is 16mm, testing by adopting different corrected standard elongations according to steel materials with different thicknesses, feeding the steel band into a flattening machine for flattening test, judging the yield of the steel band by observing the steel band after the test, controlling the rotating speed of an uncoiler in the flattening machine to be 800r/min, the diameter of a winding drum of the uncoiler to be 700mm, the power of the uncoiler to be 135kw, controlling the rotating speed of an inlet roller set in the flattening machine to be 1200r/min, controlling the power of the inlet roller set to be 120kw, and controlling the rotating speed of an outlet roller set to be 1400r/min when the stainless steel band is tested, the power of the outgoing roller group is 100kw, when a stainless steel strip is tested, the rotating speed of a main machine in a temper mill is 1500r/min, the power of the main machine is 170kw, the pressing speed of the main machine is 0.50mm/s, the layout of an interface pipeline in a gas pipe network needs to be changed in the process of the steel strip leveling test, the pipe diameter of the pipeline is improved, the monitoring of a gas main pipe pressure reducing valve is strengthened, and an inspection system of gas pressure and heat value is formulated, after the above measures are carried out, the defective rate of the plate shape is reduced, but in the aspect of improving the plate shape, the following work needs to be prepared, in the process of rolling or leveling the steel strip, in order to improve the friction coefficient between the steel strip layers and avoid the phenomenon of wrong layer scratch caused by slipping, a texturing roller can be adopted for operation, and managers of a cold rolling factory need to regularly inspect and maintain each machine, the equipment that discovery ageing phenomenon is serious should be changed, especially rubber sleeve, because it can leave over the greasy dirt in inside and outside two sides at the operation in-process, so need carry out regular cleaning process, the reel need refuel in operation process simultaneously, so the grease of reel is clear away through continuous harmomegathus after the operation is accomplished, carries out the sleeve installation again after guaranteeing clean to statistics is carried out to rubber sleeve's life, confirms best change cycle.
The invention has the beneficial effects that: through the material returning and re-leveling system, the process that an operator conducts repeated tests on the steel strip is achieved, the steel strip with lower flatness is leveled again, the waste of materials is reduced, the process of material and structure optimization is achieved, the process that the operator conducts preliminary tests is achieved, the dynamic state of a roll gap, the transverse thickness difference of a hot rolled plate, the target curve of a rolling mill shape instrument and the annealing process of the thin strip are adjusted differently, the leveler enables the operator to conduct repeated adjustment and tests according to the flatness of the steel strip, the flatness of the steel strip is improved once and again in the test process, and after the flatness of the steel strip can meet the requirements in the test process, the whole leveler can be put into formal production of the steel strip to achieve the effect of improving the yield.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method of reducing plate defects in a dry leveler, comprising the steps of:
1) material returning and leveling: for the strip steel with poor plate shape after being leveled, the steel coil with wave shape needs to be leveled again by selecting small elongation, and material returning and re-leveling need to be carried out in time if found in the following procedures;
2) material optimization: the tension roller is required to be roughened, the wear-resistant material is sprayed, and the tension roller is required to be replaced periodically, so that the tension roller can be prevented from slipping;
3) structure optimization: the method comprises the steps of dynamically adjusting roll gaps, reducing the transverse thickness difference and the surface unevenness of a hot rolled plate, optimizing a target curve of a rolling mill shape meter, improving the control capability of a thin strip shape, optimizing an annealing process of the thin strip, reducing the bonding of strip steel, controlling the leveling elongation, changing the indirect measurement of a tension roll to the measurement of laser according to the measurement of a system, changing the leveling operation mode and improving the control capability of the strip steel wave shape;
4) preliminary tests: and (3) correcting the standard elongation by adopting a stainless steel band with the thickness of 2-16mm, controlling the standard elongation to be 0.5-2.0%, feeding the steel band into a flattening machine for a flattening test, and then judging the yield of the steel band by observing the steel band after the test.
2. A method of reducing profile defects in a dry leveler as set forth in claim 1 wherein: in the replacement period of the tension roller in the step 2), the tension roller is replaced within 2 to 3 years according to the thickness of steel materials of 2 to 8mm, and the tension roller is replaced within 1 to 2 years according to the thickness of the steel materials of 8 to 16 mm.
3. A method of reducing profile defects in a dry leveler as set forth in claim 1 wherein: in the annealing process in the step 3), the annealing temperature should be controlled at 900-1000 ℃.
4. A method of reducing profile defects in a dry leveler as set forth in claim 1 wherein: and in the step 4), when the thickness of the stainless steel band is 2-8mm, the standard elongation is more than 0.5%.
5. A method of reducing profile defects in a dry leveler as set forth in claim 1 wherein: and in the step 4), when the thickness of the stainless steel band is 8-16mm, the standard elongation is less than 0.5%.
6. A method of reducing profile defects in a dry leveler as set forth in claim 1 wherein: and in the step 4), when the thickness of the stainless steel band is 2-16mm, the standard elongation is more than 1.0%.
7. A method of reducing profile defects in a dry leveler as set forth in claim 1 wherein: in the step 4), when the stainless steel strip is tested, the rotating speed of an uncoiler in the temper mill is 400-.
8. A method of reducing profile defects in a dry leveler as set forth in claim 1 wherein: in the step 4), when the stainless steel strip is tested, the rotating speed of the inlet roller set in the temper mill is 500-1200r/min, the power of the inlet roller set is 100-120kw, the rotating speed of the outlet roller set is 500-1400r/min, and the power of the outlet roller set is 80-100 kw.
9. A method of reducing profile defects in a dry leveler as set forth in claim 1 wherein: in the step 4), when the stainless steel strip is tested, the rotating speed of a main machine in the temper mill is 500-1500r/min, the power of the main machine is 150-170kw, and the reduction speed of the main machine is 0.05-0.50 mm/s.
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| 轧制技术及连轧自动化国家重点实验室（东北大学）: "1450mm酸洗冷连轧机组自动化控制系统研究与应用", 冶金工业出版社, pages: 306 - 398 * |
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