CN110918654A - Threading control method and device - Google Patents
Threading control method and device Download PDFInfo
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- CN110918654A CN110918654A CN201911215361.7A CN201911215361A CN110918654A CN 110918654 A CN110918654 A CN 110918654A CN 201911215361 A CN201911215361 A CN 201911215361A CN 110918654 A CN110918654 A CN 110918654A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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Abstract
The embodiment of the invention provides a control method and a device for threading and pulling a vehicle, wherein the method comprises the following steps: before threading the strip steel, carrying out leveling treatment on a strip head of the strip steel; controlling a press roll, a threading guide plate and a strip steel clamping component of each finish rolling stand to be in a lifting state, and controlling a roll gap of each finish rolling stand to be in an opening state; controlling the outlet tension of the final stand finish rolling stand to be more than 20 KN; when the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the minimum rolling force of the roll gaps of the press rolls of the finish rolling stands is controlled; controlling the working roll bending degree of the final finish rolling frame to be 20-40%, and controlling the middle roll bending degree to be 30-50%; and controlling the direction of the roller shifting to be maximum in the negative direction.
Description
Technical Field
The invention belongs to the technical field of cold continuous rolling, and particularly relates to a control method and device for threading and lifting.
Background
In the present day that the market competition of the cold-rolled strip steel industry is more intense, the method for reducing cost, improving efficiency and improving working efficiency becomes more important.
At present, the strip breakage, strip threading and lifting of the high-strength strip steel with thick and narrow specifications of a continuous rolling unit are a great difficult problem which needs to be faced by operators, the strip breakage often occurs in the strip threading process, and the problems of roller damage and the like caused by improper operation after the lifting of a finish rolling rack are solved, so that the working efficiency of a production line is reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a threading and start control method and device, which are used for solving the technical problems that when thick and narrow band steel is threaded and started in the prior art, the threading process is broken, and the operation is improper during start, so that the working roller is damaged, and further the working efficiency of a production line is reduced.
The embodiment of the invention provides a control method for threading and pulling a vehicle, which comprises the following steps:
before threading the strip steel, carrying out leveling treatment on a strip head of the strip steel;
controlling a press roll, a threading guide plate and a strip steel clamping component of each finish rolling stand to be in a lifting state, and controlling a roll gap of each finish rolling stand to be in an opening state;
controlling the outlet tension of the final stand finish rolling stand to be more than 20 KN;
when the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the roll gaps of the press rolls of the finish rolling stands are controlled to meet the minimum rolling force;
controlling the working roll bending degree of the final finish rolling frame to be 20-40%, and controlling the middle roll bending degree to be 30-50%; and controlling the direction of the roller shifting to be maximum in the negative direction.
Among the above-mentioned scheme, before carrying out the lift to the finish rolling frame, include:
and controlling the automatic plate shape control mode of the final finish rolling stand to be in a closed state.
In the above-mentioned scheme, to after the finish rolling frame lifts, include:
and acquiring a strip steel actual thickness fluctuation curve at the outlet of the last finish rolling stand, and shearing the strip steel if each actual thickness value in the actual thickness fluctuation curve is 10-15% of the target thickness value.
In the above scheme, after the target length of time is cut for the strip steel, the method includes:
and adjusting each actual thickness value in the actual thickness fluctuation curve to be less than 5% of the target thickness value, wherein the target time length is 15 s.
In the above scheme, the thickness of the strip steel comprises: 4.5-6.0 mm; the width of the strip steel is less than 1200 mm.
The embodiment of the invention also provides a control device for threading and lifting, which comprises:
the processing unit is used for carrying out flattening processing on the strip head of the strip steel before threading the strip steel;
the first control unit is used for controlling the compression rollers, the threading guide plates and the strip steel clamping components of the finish rolling stands to be in a lifting state and controlling the roll gaps of the finish rolling stands to be in an opening state;
when the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the roll gaps of the press rolls of the finish rolling stands are controlled to meet the minimum rolling force;
the second control unit is used for: controlling the outlet tension of the final stand finish rolling stand to be more than 20 KN;
controlling the working roll bending degree of the final finish rolling frame to be 20-40%, and controlling the middle roll bending degree to be 30-50%; and controlling the direction of the roller shifting to be maximum in the negative direction.
In the foregoing solution, the first control unit is further configured to:
and controlling the automatic plate shape control mode of the final finish rolling stand to be in a closed state.
In the above scheme, the apparatus further comprises: a third control unit; for:
and acquiring a strip steel actual thickness fluctuation curve at the outlet of the last finish rolling stand, and shearing the strip steel if each actual thickness value in the actual thickness fluctuation curve is 10-15% of the target thickness value.
In the foregoing solution, the second control unit is further configured to: after the target length of time is cut for the strip steel, adjusting each actual thickness value in the actual thickness fluctuation curve to be less than 5% of the target thickness value, wherein the target length of time is 15 s.
In the above scheme, the thickness of the strip steel comprises: 4.5-6.0 mm; the width of the strip steel is less than 1200 mm.
The embodiment of the invention provides a control method and a device for threading and pulling a vehicle, wherein the method comprises the following steps: before threading the strip steel, carrying out leveling treatment on a strip head of the strip steel; controlling a press roll, a threading guide plate and a strip steel clamping component of each finish rolling stand to be in a lifting state, and controlling a roll gap of each finish rolling stand to be in an opening state; controlling the outlet tension of the final stand finish rolling stand to be more than 20 KN; when the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the minimum rolling force of the roll gaps of the press rolls of the finish rolling stands is controlled; controlling the working roll bending degree of the final finish rolling frame to be 20-40%, and controlling the middle roll bending degree to be 30-50%; controlling the direction of roll shifting to be the maximum negative direction; therefore, after the head of the steel strip is subjected to leveling treatment, the tilting of the head of the steel strip can be eliminated, the head of the steel strip can be ensured to smoothly penetrate into a finishing mill, and when the steel strip enters the finishing mill, the outlet tension of a final stand finishing mill frame is controlled to be more than 20KN, so that the tension of a coiler can be ensured to be smoothly established; in the rolling process, the tension can be smoothly established by the recoiling machine, so that the strip steel can be prevented from slipping, the subsequent strip steel can be ensured to be smoothly threaded into a finish rolling rack, and the strip breakage condition is avoided; when the finish rolling stand starts, controlling the outlet tension of the final finish rolling stand to be more than 20KN, controlling the working roll bending degree of the final finish rolling stand to be 20-40%, and controlling the middle roll bending degree to be 30-50%; the direction of the roller shifting is controlled to be the maximum negative direction, so that the finish rolling rack can be ensured to be smoothly lifted, and the working roller is prevented from being damaged during lifting.
Drawings
Fig. 1 is a schematic flow chart of a control method for pulling a vehicle with a threading belt according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a control device for threading and pulling a car according to a second embodiment of the present invention.
Detailed Description
In order to solve the technical problems that when strip steel with thick and narrow specifications is threaded and started up in the prior art, the strip is broken in the threading process, and the working roll is damaged due to improper operation during starting up, so that the working efficiency of a production line is reduced, the invention provides a threading and starting control method and a threading and starting control device, wherein the method comprises the following steps: before threading the strip steel, carrying out leveling treatment on a strip head of the strip steel; controlling a press roll, a threading guide plate and a strip steel clamping component of each finish rolling stand to be in a lifting state, and controlling a roll gap of each finish rolling stand to be in an opening state; controlling the outlet tension of the final stand finish rolling stand to be more than 20 KN; when the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the roll gaps of the press rolls of the finish rolling stands are controlled to meet the minimum rolling force; controlling the working roll bending degree of the final finish rolling frame to be 20-40%, and controlling the middle roll bending degree to be 30-50%; and controlling the direction of the roller shifting to be maximum in the negative direction.
The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.
Example one
The embodiment provides a control method for threading and pulling a vehicle, as shown in fig. 1, the method comprises the following steps:
s110, before threading the strip steel, carrying out leveling treatment on the strip head of the strip steel;
in order to avoid the influence of the tilting of the strip head on strip threading, the strip head of the strip steel is flattened by a flattening tool before the strip steel is threaded; so that the tape head meets the following leveling parameters: the belt head warping length is 10-20 mm, the warping angle is 2-7 degrees, and the belt head is flat and smooth without large deformation within 2-4 meters.
S112, controlling the compression rollers, the threading guide plates and the strip steel clamping components of the finish rolling stands to be in a lifted state, and controlling the roll gaps of the finish rolling stands to be in an opened state;
before strip threading, controlling a press roll, a strip threading guide plate and a strip steel clamping component of each finish rolling stand to be in a lifted state, and controlling a roll gap of each finish rolling stand to be in an opened state; and placing the strip head at the inlet of the first finish rolling stand to start threading. The threading condition of the tape head needs to be tracked in the threading process so as to adjust the threading in time.
S113, controlling the outlet tension of the final finish rolling stand to be more than 20 KN;
after the strip head comes out from the outlet of the last finish rolling stand, the strip head enters a mandrel of a recoiling machine to start to curl, and the bending direction of the strip head at the inner circle of the strip steel is opposite to the coiling assisting direction of the mandrel, so that the rebounding direction of a coiling assisting device at the bending position cannot be realized, the inner circle of the mandrel cannot be wrapped firmly, the strip steel can slip, the strip steel cannot be coiled, and further the subsequent strip steel cannot be smoothly threaded.
Therefore, in order to overcome the above problem, the exit tension of the final stand finishing mill is controlled to be more than 20KN to ensure smooth tension establishment at the time of the curling. In the rolling process, the tension can be smoothly established by the coiling machine, so that the strip steel can be prevented from slipping in the coiling process, and the subsequent strip steel can be ensured to smoothly penetrate into a finishing mill frame in the rolling process, and the strip breakage condition is avoided.
S114, when the finish rolling stands are started, controlling the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands to be in a rolling state, and controlling the roll gaps of the press rolls of the finish rolling stands to meet the minimum rolling force;
after the strip steel can be smoothly threaded, the finish rolling stand can be lifted to roll the strip steel. Before the finish rolling machine frame is lifted, the method comprises the following steps: and controlling the automatic plate shape control mode of the final finishing stand to be in a closed state.
When the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the roll gaps of the press rolls of the finish rolling stands are controlled to meet the minimum rolling force; the minimum rolling force was 1.5 MN.
S115, controlling the roll bending degree of a working roll of the final finish rolling stand to be 20-40%, and controlling the roll bending degree of a middle roll to be 30-50%; controlling the direction of roll shifting to be the maximum negative direction;
after the rolling mill is started, in the rolling process, the working roll bending degree of the final finish rolling frame is controlled to be 20-40%, and the middle roll bending degree is controlled to be 30-50%; controlling the direction of roll shifting to be the maximum negative direction; in this embodiment, the negative maximum is-142.5 mm, which can be practically adjusted according to different production lines.
And after the start of the rolling mill is finished, rotating the curling mandrel to a rolling position through a large carrousel, wrapping the coiling mandrel with a wrapper to obtain an actual thickness fluctuation curve of the strip steel at the outlet of the last finish rolling stand, and shearing the strip steel if the actual thickness in the actual thickness fluctuation curve is plus or minus 10-15% of the target thickness (namely the actual thickness fluctuation curve floats up and down 10-15% of the target thickness curve). Here, the target thickness curve is a straight line.
After the band steel is sheared for the target time length, the method comprises the following steps:
and adjusting the actual thickness in the actual thickness fluctuation curve to be less than 5% of the target thickness, namely when the actual thickness value of the subsequent strip steel is less than 5% of the target thickness value, shearing can be carried out, and the scrap steel rate is reduced. The target duration is 15 s.
Based on the same inventive concept, the invention also provides a control device for threading and lifting, which is detailed in the second embodiment.
Example two
The embodiment further provides a control device for threading and pulling, as shown in fig. 2, the device includes: a processing unit 21, a first control unit 22, and a second control unit 23; wherein the content of the first and second substances,
in order to avoid the influence of the tilting of the strip head on strip threading, the processing unit 21 is used for carrying out leveling treatment on the strip head of the strip steel by using a leveling tool before the strip steel is threaded; so that the tape head meets the following leveling parameters: the belt head warping length is 10-20 mm, the warping angle is 2-7 degrees, and the belt head is flat and smooth without large deformation within 2-4 meters.
Before strip threading, the first control unit 22 is used for controlling the press rolls, the strip threading guide plates and the strip steel clamping components of each finish rolling stand to be in a lifting state and controlling the roll gaps of each finish rolling stand to be in an opening state; and placing the strip head at the inlet of the first finish rolling stand to start threading. The threading condition of the tape head needs to be tracked in the threading process so as to adjust the threading in time.
After the strip head comes out from the outlet of the last finish rolling stand, the strip head enters a mandrel of a recoiling machine to start to curl, and the bending direction of the strip head at the inner circle of the strip steel is opposite to the coiling assisting direction of the mandrel, so that the rebounding direction of a coiling assisting device at the bending position cannot be realized, the inner circle of the mandrel cannot be wrapped firmly, the strip steel can slip, the strip steel cannot be coiled, and further the subsequent strip steel cannot be smoothly threaded.
Therefore, in order to overcome the above problem, the second control unit 23 is configured to control the exit tension of the final stand finishing stand to be greater than 20KN to ensure that the tension can be smoothly established at the time of the curling. In the rolling process, the tension can be smoothly established by the coiling machine, so that the strip steel can be prevented from slipping in the coiling process, and the subsequent strip steel can be ensured to smoothly penetrate into a finishing mill frame in the rolling process, and the strip breakage condition is avoided.
After the strip steel can be smoothly threaded, the finish rolling stand can be lifted to roll the strip steel. Before the start-up of the finishing stand, the first control unit 22 is also configured to: and controlling the automatic plate shape control mode of the final finishing stand to be in a closed state.
When starting up the finishing stand, the first control unit 22 is also configured to: controlling the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands to be in a rolling state, and controlling the roll gaps of the press rolls of the finish rolling stands to meet the minimum rolling force; the minimum rolling force was 1.5 MN.
After the start, during the rolling process, the second control unit 23 is configured to: controlling the working roll bending degree of the final finish rolling frame to be 20-40%, and controlling the middle roll bending degree to be 30-50%; controlling the direction of roll shifting to be the maximum negative direction; in this embodiment, the negative maximum is-142.5 mm, which can be practically adjusted according to different production lines.
And after the start of the rolling mill is finished, rotating the curling mandrel to a rolling position through a large carrousel, wrapping the coiling mandrel with a wrapper to obtain an actual thickness fluctuation curve of the strip steel at the outlet of the last finish rolling stand, and shearing the strip steel if the actual thickness in the actual thickness fluctuation curve is plus or minus 10-15% of the target thickness (namely the actual thickness fluctuation curve floats up and down 10-15% of the target thickness curve). Here, the target thickness curve is a straight line.
After the target strip steel shearing time length is obtained, the third control unit 24 is further configured to:
and adjusting the actual thickness in the actual thickness fluctuation curve to be less than 5% of the target thickness, namely when the actual thickness value of the subsequent strip steel is less than 5% of the target thickness value, shearing can be carried out, and the scrap steel rate is reduced. The target duration is 15 s.
The threading vehicle lifting method and the threading vehicle lifting device provided by the embodiment of the invention have the beneficial effects that at least:
the embodiment of the invention provides a control method and a device for threading and pulling a vehicle, wherein the method comprises the following steps: before threading the strip steel, carrying out leveling treatment on a strip head of the strip steel; controlling a press roll, a threading guide plate and a strip steel clamping component of each finish rolling stand to be in a lifting state, and controlling a roll gap of each finish rolling stand to be in an opening state; controlling the outlet tension of the final stand finish rolling stand to be more than 20 KN; when the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the minimum rolling force of the roll gaps of the press rolls of the finish rolling stands is controlled; controlling the working roll bending degree of the final finish rolling frame to be 20-40%, and controlling the middle roll bending degree to be 30-50%; controlling the direction of roll shifting to be the maximum negative direction; therefore, after the head of the steel strip is subjected to leveling treatment, the tilting of the head of the steel strip can be eliminated, the head of the steel strip can be ensured to smoothly penetrate into a finishing mill, and when the steel strip enters the finishing mill, the outlet tension of a final stand finishing mill frame is controlled to be more than 20KN, so that the tension of a coiler can be ensured to be smoothly established; in the rolling process, the tension can be smoothly established by the recoiling machine, so that the strip steel can be prevented from slipping, the subsequent strip steel can be ensured to be smoothly threaded into a finish rolling rack, and the strip breakage condition is avoided; when the finish rolling stand starts, controlling the outlet tension of the final finish rolling stand to be more than 20KN, controlling the working roll bending degree of the final finish rolling stand to be 20-40%, and controlling the middle roll bending degree to be 30-50%; the direction of the roller shifting is controlled to be the maximum negative direction, so that the finish rolling rack can be ensured to be smoothly lifted, and the working roller is prevented from being damaged during lifting.
EXAMPLE III
In practical application, when strip steel with the thickness of 5mm, the width of 1007mm and the yield strength of 552Mpa is threaded and started, the following concrete steps are realized:
in order to avoid the influence of the tilting of the strip head on strip threading, the strip head of the strip steel is flattened by a flattening tool before the strip steel is threaded; the belt head warping length is 11mm, the warping angle is 5 degrees, and the belt head is flat and smooth without large deformation within 2-4 meters.
Before strip threading, controlling a press roll, a strip threading guide plate and a strip steel clamping component of each finish rolling stand to be in a lifted state, and controlling a roll gap of each finish rolling stand to be in an opened state; and placing the strip head at the inlet of the first finish rolling stand to start threading. The threading condition of the tape head needs to be tracked in the threading process so as to adjust the threading in time.
After the strip head comes out from the outlet of the last finish rolling stand, the strip head enters a mandrel of a recoiling machine to start to curl, and the bending direction of the strip head at the inner circle of the strip steel is opposite to the coiling assisting direction of the mandrel, so that the rebounding direction of a coiling assisting device at the bending position cannot be realized, the inner circle of the mandrel cannot be wrapped firmly, the strip steel can slip, the strip steel cannot be coiled, and further the subsequent strip steel cannot be smoothly threaded.
Therefore, in order to overcome the above problem, the exit tension of the final stand finishing mill was controlled to 26KN to ensure smooth tension establishment at the time of the curling. In the rolling process, the tension can be smoothly established by the coiling machine, so that the strip steel can be prevented from slipping in the coiling process, and the subsequent strip steel can be ensured to smoothly penetrate into a finishing mill frame in the rolling process, and the strip breakage condition is avoided.
After the strip steel can be smoothly threaded, the finish rolling stand can be lifted to roll the strip steel. Before the finish rolling machine frame is lifted, the method comprises the following steps: and controlling the automatic plate shape control mode of the final finishing stand to be in a closed state.
When the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the roll gaps of the press rolls of the finish rolling stands are controlled to meet the minimum rolling force; the minimum rolling force was 1.5 MN.
After the rolling mill is started, in the rolling process, the bending degree of a working roll of the final finish rolling frame is controlled to be 31 percent, and the bending degree of a middle roll is controlled to be 39 percent; controlling the direction of roll shifting to be the maximum negative direction; the negative maximum in this example is-142.5 mm.
And after the start of the rolling mill is finished, rotating the curling mandrel to a rolling position through the Kaluoshi large plate, wrapping the coiling mandrel with a wrapper, and obtaining an actual thickness fluctuation curve of the strip steel at the outlet of the last finish rolling stand, wherein each actual thickness value in the actual thickness fluctuation curve is 15% of the target thickness value, and then shearing the strip steel.
After the shearing is carried out for 15s, each actual thickness value in the actual thickness fluctuation curve is adjusted to be less than 5% of the target thickness value, namely when the actual thickness value of the subsequent strip steel is less than 5% of the target thickness value, the shearing can be carried out, and the scrap steel rate is reduced.
Example four
In practical application, when cold-rolled strip steel with the thickness of 4.5mm, the width of 1150mm and the yield strength of 408MPa is threaded and lifted, the following concrete steps are realized:
in order to avoid the influence of the tilting of the strip head on strip threading, the strip head of the strip steel is flattened by a flattening tool before the strip steel is threaded; the belt head warping length is 14mm, the warping angle is 6 degrees, and the belt head is flat and smooth without large deformation within 2-4 meters.
Before strip threading, controlling a press roll, a strip threading guide plate and a strip steel clamping component of each finish rolling stand to be in a lifted state, and controlling a roll gap of each finish rolling stand to be in an opened state; and placing the strip head at the inlet of the first finish rolling stand to start threading. The threading condition of the tape head needs to be tracked in the threading process so as to adjust the threading in time.
After the strip head comes out from the outlet of the last finish rolling stand, the strip head enters a mandrel of a recoiling machine to start to curl, and the bending direction of the strip head at the inner circle of the strip steel is opposite to the coiling assisting direction of the mandrel, so that the rebounding direction of a coiling assisting device at the bending position cannot be realized, the inner circle of the mandrel cannot be wrapped firmly, the strip steel can slip, the strip steel cannot be coiled, and further the subsequent strip steel cannot be smoothly threaded.
Therefore, in order to overcome the above problem, the exit tension of the final stand finishing mill was controlled to 22KN to ensure smooth tension establishment at the time of the curling. In the rolling process, the tension can be smoothly established by the coiling machine, so that the strip steel can be prevented from slipping in the coiling process, and the subsequent strip steel can be ensured to smoothly penetrate into a finishing mill frame in the rolling process, and the strip breakage condition is avoided.
After the strip steel can be smoothly threaded, the finish rolling stand can be lifted to roll the strip steel. Before the finish rolling machine frame is lifted, the method comprises the following steps: and controlling the automatic plate shape control mode of the final finishing stand to be in a closed state.
When the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the roll gaps of the press rolls of the finish rolling stands are controlled to meet the minimum rolling force; the minimum rolling force was 1.5 MN.
After the rolling mill is started, in the rolling process, the bending degree of a working roll of the final finish rolling frame is controlled to be 35%, and the bending degree of a middle roll is controlled to be 45%; controlling the direction of roll shifting to be the maximum negative direction; the negative maximum in this example is-142.5 mm.
And after the start of the rolling mill is finished, rotating the curling mandrel to a rolling position through the Kaluoshi large plate, wrapping the coiling mandrel with a wrapper, and obtaining an actual thickness fluctuation curve of the strip steel at the outlet of the last finish rolling stand, wherein each actual thickness value in the actual thickness fluctuation curve is 11% of the target thickness value, and then shearing the strip steel.
After the shearing is carried out for 15s, each actual thickness value in the actual thickness fluctuation curve is adjusted to be less than 5% of the target thickness value, namely when the actual thickness value of the subsequent strip steel is less than 5% of the target thickness value, the shearing can be carried out, and the scrap steel rate is reduced.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A method for controlling a threading start, the method comprising:
before threading the strip steel, carrying out leveling treatment on a strip head of the strip steel;
controlling a press roll, a threading guide plate and a strip steel clamping component of each finish rolling stand to be in a lifting state, and controlling a roll gap of each finish rolling stand to be in an opening state;
controlling the outlet tension of the final stand finish rolling stand to be more than 20 KN;
when the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the roll gaps of the press rolls of the finish rolling stands are controlled to meet the minimum rolling force;
controlling the working roll bending degree of the final finish rolling frame to be 20-40%, and controlling the middle roll bending degree to be 30-50%; and controlling the direction of the roller shifting to be maximum in the negative direction.
2. The method of claim 1, wherein prior to the lifting of the finish rolling stand, comprising:
and controlling the automatic plate shape control mode of the final finish rolling stand to be in a closed state.
3. The method of claim 1, wherein the step of removing the finish rolling stand comprises:
and acquiring a strip steel actual thickness fluctuation curve at the outlet of the last finish rolling stand, and shearing the strip steel if each actual thickness value in the actual thickness fluctuation curve is 10-15% of the target thickness value.
4. The method of claim 3, wherein shearing the strip for the target length of time comprises:
and adjusting each actual thickness value in the actual thickness fluctuation curve to be less than 5% of the target thickness value, wherein the target time length is 15 s.
5. The method of claim 1, wherein the thickness of the strip comprises: 4.5-6.0 mm; the width of the strip steel is less than 1200 mm.
6. A threading start control apparatus, comprising:
the processing unit is used for carrying out flattening processing on the strip head of the strip steel before threading the strip steel;
the first control unit is used for controlling the compression rollers, the threading guide plates and the strip steel clamping components of the finish rolling stands to be in a lifting state and controlling the roll gaps of the finish rolling stands to be in an opening state;
when the finish rolling stands are started, the press rolls, the threading guide plates and the strip steel clamping components of the finish rolling stands are controlled to be in a rolling state, and the roll gaps of the press rolls of the finish rolling stands are controlled to meet the minimum rolling force;
the second control unit is used for: controlling the outlet tension of the final stand finish rolling stand to be more than 20 KN;
controlling the working roll bending degree of the final finish rolling frame to be 20-40%, and controlling the middle roll bending degree to be 30-50%; and controlling the direction of the roller shifting to be maximum in the negative direction.
7. The apparatus of claim 6, wherein the first control unit is further to:
and controlling the automatic plate shape control mode of the final finish rolling stand to be in a closed state.
8. The apparatus of claim 6, wherein the apparatus further comprises: a third control unit; for:
and acquiring a strip steel actual thickness fluctuation curve at the outlet of the last finish rolling stand, and shearing the strip steel if each actual thickness value in the actual thickness fluctuation curve is 10-15% of the target thickness value.
9. The apparatus of claim 8, wherein the second control unit is further to: after the target length of time is cut for the strip steel, adjusting each actual thickness value in the actual thickness fluctuation curve to be less than 5% of the target thickness value, wherein the target length of time is 15 s.
10. The apparatus of claim 6, wherein the thickness of the strip comprises: 4.5-6.0 mm; the width of the strip steel is less than 1200 mm.
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| CN201911215361.7A CN110918654B (en) | 2019-12-02 | 2019-12-02 | Threading control method and device |
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| CN201911215361.7A CN110918654B (en) | 2019-12-02 | 2019-12-02 | Threading control method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111451270A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Rolling method for thick-head start of high-strength steel of cold continuous rolling mill set |
| CN111804740A (en) * | 2020-07-16 | 2020-10-23 | 北京首钢冷轧薄板有限公司 | Method for threading whole-line strip steel on acid rolling production line |
| CN113245375A (en) * | 2021-06-04 | 2021-08-13 | 北京首钢冷轧薄板有限公司 | Method for eliminating last frame indentation of continuous rolling mill in start state |
| CN113680827A (en) * | 2021-08-17 | 2021-11-23 | 北京首钢冷轧薄板有限公司 | Method for lifting cold-rolled thin high-reduction-rate high-strength steel after strip breakage |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000176521A (en) * | 1998-12-10 | 2000-06-27 | Kawasaki Steel Corp | Method for controlling cold rolling of metallic belt |
| CN101780480A (en) * | 2009-01-16 | 2010-07-21 | 宝山钢铁股份有限公司 | Thickness control compensation method of strip steel head part when welding line passes through rack |
| CN102806250A (en) * | 2012-08-02 | 2012-12-05 | 山西太钢不锈钢股份有限公司 | Method for flatting stainless steel strips |
| CN103785694A (en) * | 2013-11-22 | 2014-05-14 | 首钢总公司 | Method for preventing strip breakage on startup |
| CN110202009A (en) * | 2019-06-11 | 2019-09-06 | 首钢京唐钢铁联合有限责任公司 | A kind of milling train vehicle method for controlling thickness and device |
-
2019
- 2019-12-02 CN CN201911215361.7A patent/CN110918654B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000176521A (en) * | 1998-12-10 | 2000-06-27 | Kawasaki Steel Corp | Method for controlling cold rolling of metallic belt |
| CN101780480A (en) * | 2009-01-16 | 2010-07-21 | 宝山钢铁股份有限公司 | Thickness control compensation method of strip steel head part when welding line passes through rack |
| CN102806250A (en) * | 2012-08-02 | 2012-12-05 | 山西太钢不锈钢股份有限公司 | Method for flatting stainless steel strips |
| CN103785694A (en) * | 2013-11-22 | 2014-05-14 | 首钢总公司 | Method for preventing strip breakage on startup |
| CN110202009A (en) * | 2019-06-11 | 2019-09-06 | 首钢京唐钢铁联合有限责任公司 | A kind of milling train vehicle method for controlling thickness and device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111451270A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Rolling method for thick-head start of high-strength steel of cold continuous rolling mill set |
| CN111451270B (en) * | 2020-03-31 | 2022-03-22 | 鞍钢股份有限公司 | Rolling method for thick-head start of high-strength steel of cold continuous rolling mill set |
| CN111804740A (en) * | 2020-07-16 | 2020-10-23 | 北京首钢冷轧薄板有限公司 | Method for threading whole-line strip steel on acid rolling production line |
| CN113245375A (en) * | 2021-06-04 | 2021-08-13 | 北京首钢冷轧薄板有限公司 | Method for eliminating last frame indentation of continuous rolling mill in start state |
| CN113245375B (en) * | 2021-06-04 | 2022-07-15 | 北京首钢冷轧薄板有限公司 | Method for eliminating last frame indentation of continuous rolling mill in start state |
| CN113680827A (en) * | 2021-08-17 | 2021-11-23 | 北京首钢冷轧薄板有限公司 | Method for lifting cold-rolled thin high-reduction-rate high-strength steel after strip breakage |
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