CN110328245B - Method and device for controlling tail flicking of strip steel - Google Patents
Method and device for controlling tail flicking of strip steel Download PDFInfo
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- CN110328245B CN110328245B CN201910587456.5A CN201910587456A CN110328245B CN 110328245 B CN110328245 B CN 110328245B CN 201910587456 A CN201910587456 A CN 201910587456A CN 110328245 B CN110328245 B CN 110328245B
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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
- B21B37/72—Rear end control; Front end control
Abstract
The embodiment of the invention provides a method and a device for controlling the tail flicking of strip steel, which are applied to a strip steel rolling mill, wherein the rolling mill comprises the following steps: the device comprises a first rack, a second rack, a third rack, a fourth rack, a fifth rack, a sixth rack and a seventh rack; the method comprises the following steps: controlling the roll gap distance of the first frame to be A + B, wherein A is the initial roll gap distance of the first frame, and B is 0.15-0.5 mm; controlling the roll gap distance of the second rack to be C + B, wherein C is the initial roll gap distance of the second rack, and the roll gap distance of the second rack is smaller than the roll gap distance of the first rack; and controlling the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack to be consistent.
Description
Technical Field
The invention belongs to the technical field of hot rolling of strip steel, and particularly relates to a method and a device for controlling tail flicking of the strip steel.
Background
The tail of the hot-rolled high-strength thin strip steel is often folded due to serious deviation, or the tail of the strip steel is scraped with a side guide plate and the like, so that the tail of the strip steel is broken to crack a roller, the surface quality of the subsequently rolled strip steel is influenced, and the product is degraded; meanwhile, the roller consumption is increased, and the operation efficiency is influenced.
In the prior art, the band steel tail flicking is mainly controlled by depending on the function precision of equipment, but the functional precision of the equipment is complex due to a plurality of related factors, and even if effective factors can be measured, the factors can not be completely matched with the tail flicking problem, so that the problem of the band steel tail flicking is difficult to accurately control.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for controlling the tail flicking of strip steel, which are used for solving the technical problem that the tail flicking of the strip steel cannot be effectively controlled in the prior art.
The embodiment of the invention provides a method for controlling the tail flicking of strip steel, which is applied to a strip steel rolling mill, wherein the rolling mill comprises the following steps: the device comprises a first rack, a second rack, a third rack, a fourth rack, a fifth rack, a sixth rack and a seventh rack; the method comprises the following steps:
controlling the roll gap distance of the first frame to be A + B, wherein A is the initial roll gap distance of the first frame, and B is 0.15-0.5 mm;
controlling the roll gap distance of the second rack to be C + B, wherein C is the initial roll gap distance of the second rack, and the roll gap distance of the second rack is smaller than the roll gap distance of the first rack;
controlling the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack to be consistent based on the steel throwing directions of the first rack and the second rack.
In the above solution, the rigidity values of the first rack, the second rack, the third rack and the fourth rack are not less than 2744000N/m, and the rigidity values of the fifth rack, the sixth rack and the seventh rack are not less than 2646000N/m;
the rigidity difference of the two sides of the first frame, the second frame, the third frame and the fourth frame is not more than 147000N/m, and the rigidity difference of the two sides of the fifth frame, the sixth frame and the seventh frame is not more than 98000N/m.
In the foregoing solution, the controlling the steel throwing directions of the third frame, the fourth frame, the fifth frame, the sixth frame and the seventh frame to be the same based on the steel throwing directions of the first frame and the second frame includes:
obtaining the historical steel throwing direction of a current frame and the current steel throwing direction of a previous frame of the current frame, and determining the roll gap leveling value of the current frame according to the current steel throwing direction of the previous frame and the historical steel throwing direction of the current frame;
adjusting the steel throwing direction of the current frame according to the roll gap leveling value of the current frame, so that the steel throwing directions of the third frame, the fourth frame, the fifth frame, the sixth frame and the seventh frame are consistent; wherein the current chassis includes: the third rack, the fourth rack, the fifth rack, the sixth rack, and the seventh rack.
In the scheme, the adjustment quantity of the leveling value of the third rack is 0.1-0.2 mm.
In the scheme, the adjustment quantity of the leveling value of the fourth rack is 0.1-0.15 mm.
The embodiment of the invention also provides a device for controlling the tail flicking of the strip steel, which is applied to a strip steel rolling mill, wherein the rolling mill comprises: the device comprises a first rack, a second rack, a third rack, a fourth rack, a fifth rack, a sixth rack and a seventh rack; the device comprises:
the first control unit is used for controlling the roll gap distance of the first rack to be A + B, wherein A is the initial roll gap distance of the first rack, and B is 0.15-0.5 mm;
the second control unit is used for controlling the roll gap distance of the second rack to be C + B, wherein C is the initial roll gap distance of the second rack, and the roll gap distance of the second rack is smaller than the roll gap distance of the first rack;
and the third control unit is used for controlling the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack to be consistent.
In the above solution, the rigidity values of the first rack, the second rack, the third rack and the fourth rack are not less than 2744000N/m, and the rigidity values of the fifth rack, the sixth rack and the seventh rack are controlled to be not less than 2646000N/m;
the rigidity difference of the two sides of the first frame, the second frame, the third frame and the fourth frame is not more than 147000N/m, and the rigidity difference of the two sides of the fifth frame, the sixth frame and the seventh frame is controlled not to be more than 98000N/m.
In the foregoing solution, the third control unit is specifically configured to:
obtaining the historical steel throwing direction of a current frame and the current steel throwing direction of a previous frame of the current frame, and determining the roll gap leveling value of the current frame according to the current steel throwing direction of the previous frame and the historical steel throwing direction of the current frame;
adjusting the steel throwing direction of the current frame according to the roll gap leveling value of the current frame, so that the steel throwing directions of the third frame, the fourth frame, the fifth frame, the sixth frame and the seventh frame are consistent; wherein the current chassis includes: the third rack, the fourth rack, the fifth rack, the sixth rack, and the seventh rack.
In the scheme, the adjustment quantity of the leveling value of the third rack is 0.1-0.2 mm.
In the scheme, the adjustment quantity of the leveling value of the fourth rack is 0.1-0.15 mm.
The embodiment of the invention provides a method and a device for controlling the tail flicking of strip steel, which are applied to a strip steel rolling mill, wherein the rolling mill comprises the following steps: the device comprises a first rack, a second rack, a third rack, a fourth rack, a fifth rack, a sixth rack and a seventh rack; the method comprises the following steps: controlling the roll gap distance of the first frame to be A + B, wherein A is the initial roll gap distance of the first frame, and B is 0.15-0.5 mm; controlling the roll gap distance of the second rack to be C + B, wherein C is the initial roll gap distance of the second rack, and the roll gap distance of the second rack is smaller than the roll gap distance of the first rack; controlling the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack to be consistent based on the steel throwing directions of the first rack and the second rack; therefore, the tail of the strip steel has a wedge shape by increasing the roll gap distance between the first frame and the second frame, so that the steel throwing trend of the strip steel on the rear frame can be better controlled; the roll gap distance of the second frame is smaller than that of the first frame, so that the situation that the tail part of the strip steel is too large in the shape of a wedge of the third frame and the deviation and tail breakage are avoided; meanwhile, the steel throwing directions of the third frame, the fourth frame, the fifth frame, the sixth frame and the seventh frame are controlled to be consistent on the basis of the steel throwing directions of the first frame and the second frame, the tail of the strip steel is prevented from seriously deviating in the rear frame, the strip steel is further prevented from drifting, and the rear frame is the fifth frame to the seventh frame.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling the tail flicking of a strip steel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for controlling the tail flicking of the strip steel according to the second embodiment of the present invention.
Detailed Description
In order to solve the technical problem that the quality of strip steel cannot be guaranteed due to the fact that the deviation and the drift of the strip steel cannot be effectively controlled in the prior art, the embodiment of the invention provides a method and a device for controlling the deviation of the strip steel, which are applied to a strip steel rolling mill, wherein the rolling mill comprises: the device comprises a first rack, a second rack, a third rack, a fourth rack, a fifth rack, a sixth rack and a seventh rack; the method comprises the following steps: controlling the roll gap distance of the first frame to be A + B, wherein A is the initial roll gap distance of the first frame, and B is 0.15-0.5 mm; controlling the roll gap distance of the second rack to be C + B, wherein C is the initial roll gap distance of the second rack, and the roll gap distance of the second rack is smaller than the roll gap distance of the first rack; controlling the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack to be consistent based on the steel throwing directions of the first rack and the second rack.
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 method for controlling deviation of strip steel, which is applied to a scene of rolling high-strength steel by a strip steel rolling mill, and as shown in fig. 1, the method comprises the following steps:
s110, controlling the roll gap distance of the first frame to be A + B, wherein A is the initial roll gap distance of the first frame, and B is 0.15-0.5 mm; controlling the roll gap distance of the second frame to be C + B, wherein C is the initial roll gap distance of the second frame;
in this embodiment, the strip mill includes: a first frame F1, a second frame F2, a third frame F3, a fourth frame F4, a fifth frame F5, a sixth frame F6, and a seventh frame F7.
Generally, the strip steel cannot be absolutely straight in the rolling process, and the deviation phenomenon is inevitably generated, so that the tail part of the strip steel deflects in a non-directional way, and the micro deviation of the strip steel does not influence the quality of the strip steel and does not damage a roller. Therefore, the tail part of the strip steel is slightly deviated directly according to the deviation direction of the tail part of the strip steel, and the slightly deviated direction is determined, so that the deviation degree of the strip steel can be effectively controlled, and the strip steel is prevented from drifting.
It should be noted that the micro-deviation in this embodiment means that the strip steel is not scratched with the side guides on both sides of the inlet of the rolling mill.
In each frame, the tail of the strip steel is subjected to tension loss at the moment of throwing the steel, the strip steel plate shape returns inertly, and the phenomenon that the tail of the strip steel is seriously deviated and flapped occurs in the rear frame because the strip steel of the rear frame is thin and high in speed. The rear frame includes: a fifth frame, a sixth frame and a seventh frame.
The roll gap distance of the first frame is controlled to be A + B, A is the initial roll gap distance of the first frame, B is 0.15-0.5 mm, the roll gap distance of the second frame is controlled to be C + B, and C is the initial roll gap distance of the second frame. That is to say, the roll gap distance of the first frame and the roll gap distance of the second frame are increased on the basis of the initial roll gap. Therefore, the tail part of the strip steel has a wedge shape on the first frame and the second frame. The tail of the strip steel is forced to deviate to the other side of the rear rack due to inconsistent extension of the two sides, so that the general trend of the tail of the strip steel is determined, and the tail of the strip steel is prevented from seriously deviating.
Here, in order to prevent serious deviation due to an excessively large wedge shape of the third frame, the roll gap distance of the second frame is smaller than that of the first frame.
Moreover, when the rigidity of the rolling mill is increased, the difference value of the rigidity of two sides of the rolling mill is increased, and the roll gaps at two sides are bounced inconsistently due to overlarge difference of the rigidity of two sides, so that the formed wedge is difficult to control, therefore, the rigidity values of the first rack, the second rack, the third rack and the fourth rack are not less than 2744000N/m, and the rigidity values of the fifth rack, the sixth rack and the seventh rack are not less than 2646000N/m in the embodiment; the rigidity difference of the two sides of the first frame, the second frame, the third frame and the fourth frame is not more than 147000N/m, and the rigidity difference of the two sides of the fifth frame, the sixth frame and the seventh frame is not more than 98000N/m.
S111, controlling the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack to be consistent with the steel throwing directions of the first rack and the second rack.
Aiming at different steel types, in order to avoid serious deviation of the tail part of the strip steel at the rear part of the rack caused by overlarge wedge shape of the first rack, the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack are controlled to be consistent, wherein the steel throwing direction is the steel throwing direction in a slightly-deviated state.
Here, controlling the steel throwing directions of the third frame, the fourth frame, the fifth frame, the sixth frame and the seventh frame to be consistent includes:
acquiring the current steel throwing direction of a previous frame of the current frame and the historical steel throwing direction of the current frame, and determining the roll gap leveling value of the current frame according to the current steel throwing direction of the previous frame and the historical steel throwing direction of the current frame;
adjusting the steel throwing direction of the current frame according to the roll gap leveling value of the current frame, so that the steel throwing directions of the third frame, the fourth frame, the fifth frame, the sixth frame and the seventh frame are consistent; wherein, the current frame includes: any one of a third rack, a fourth rack, a fifth rack, a sixth rack and a seventh rack.
For example, when the current stand is a third stand, the current steel throwing direction of the second stand and the historical steel throwing direction of the third stand need to be obtained, where the historical steel throwing direction is the steel throwing direction when rolling steel types with similar specifications.
Determining a roll gap leveling value of a third rack according to the current steel throwing direction of the second rack and the historical steel throwing direction of the third rack; and correspondingly adjusting the steel throwing direction of the third frame according to the roll gap leveling value of the third frame.
Similarly, when the steel throwing directions of the fourth rack, the fifth rack, the sixth rack and the seventh rack are determined, adjustment is performed according to the same method, and details are not repeated here.
The adjustment amount of the leveling value of the third rack is 0.1-0.2 mm; the adjustment quantity of the leveling value of the fourth rack is 0.1-0.15 mm.
For example, when roll gaps of the transmission sides F1 and F2 are controlled to be lifted according to preset roll gap distances, the tail of the strip steel can deviate towards the operation side in the rear F5-F7 frame, the roll gap leveling value of the F3 frame is determined according to the current steel throwing direction of F2 and the historical steel throwing direction of F3, and the levelness of the roll gap of the F3 frame is adjusted according to the corresponding roll gap leveling value; the levelness of the roll gap of the F4 stand is adjusted by the same method, so that the slight deviation of the strip steel in the F3 and the F4 is ensured, and the strip steel is prevented from seriously deviating. After the directions of F3 and F4 are determined, F5-F7 are adjusted. On the contrary, when the roll gaps of the F1 and F2 operation sides are controlled to be lifted according to the preset roll gap distance, the tail of the strip steel can deviate towards the transmission side in the rear F5-F7 rack, the roll gap leveling value of the F3 rack is determined according to the steel throwing direction of the F1 and the F2 and the historical steel throwing direction of the F3, the roll gap levelness of the F3 rack is adjusted according to the corresponding roll gap leveling value, the roll gap levelness of the F4 rack is adjusted by the same method, and the strip steel is guaranteed to slightly deviate in the two racks of the F3 and the F4. Therefore, the serious deviation of the strip steel in the rear frame can be avoided.
It should be noted that, theoretically, the corresponding roll gap levelness is adjusted in sequence according to the sequence of each frame, but in the actual production process, the steel throwing speed of the strip steel of the F5-F7 frames is faster, and is generally adjusted at the same time, that is, because the directions of F3-F7 are consistent, the roll gap leveling value of the F5-F7 frames can be determined according to F4.
Based on the same inventive concept, the invention also provides a device for controlling the tail flicking of the strip steel, which is detailed in the second embodiment.
Example two
The embodiment provides a device for controlling the tail flicking of strip steel, as shown in fig. 2, the device comprises: a first control unit 21, a second control unit 22, and a third control unit 23; wherein the content of the first and second substances,
the device is applied to a strip mill, which comprises: a first frame F1, a second frame F2, a third frame F3, a fourth frame F4, a fifth frame F5, a sixth frame F6, and a seventh frame F7.
Generally, the strip steel cannot be absolutely straight in the rolling process, and the deviation phenomenon is inevitably generated, so that the tail part of the strip steel deflects in a non-directional way, and the micro deviation of the strip steel does not influence the quality of the strip steel and does not damage a roller. Therefore, the tail part of the strip steel is slightly deviated directly according to the deviation direction of the tail part of the strip steel, and the slightly deviated direction is determined, so that the deviation degree of the strip steel can be effectively controlled, and the strip steel is prevented from drifting.
It should be noted that the slight deviation in this embodiment means that the strip steel is not seriously scratched against the side guide plates on both sides of the inlet of the rolling mill.
In each frame, the tail of the strip steel is subjected to tension loss at the moment of throwing the steel, the strip steel plate shape returns inertly, and the phenomenon that the tail of the strip steel is seriously deviated and flapped occurs in the rear frame because the strip steel of the rear frame is thin and high in speed. The rear frame includes: a fifth frame, a sixth frame and a seventh frame.
The first control unit 21 is configured to control a roll gap distance of the first frame to be a + B, where a is an initial roll gap distance of the first frame, and B is 0.15-0.5 mm; the second control unit 22 is configured to control a roll gap distance of the second frame to be C + B, where C is an initial roll gap distance of the second frame. That is to say, the roll gap distance of the first frame and the roll gap distance of the second frame are increased on the basis of the initial roll gap. Therefore, the tail part of the strip steel has a wedge shape on the first frame and the second frame. The tail of the strip steel is forced to deviate to the other side of the rear rack due to inconsistent extension of the two sides, so that the general trend of the tail of the strip steel is determined, and the tail of the strip steel is prevented from seriously deviating.
Here, in order to prevent serious deviation due to an excessively large wedge shape of the third frame, the roll gap distance of the second frame is smaller than that of the first frame.
Moreover, when the rigidity of the rolling mill is increased, the difference value of the rigidity of two sides of the rolling mill is increased, and the roll gaps at two sides are bounced inconsistently due to overlarge difference of the rigidity of two sides, so that the formed wedge is difficult to control, therefore, the rigidity values of the first rack, the second rack, the third rack and the fourth rack are not less than 2744000N/m, and the rigidity values of the fifth rack, the sixth rack and the seventh rack are not less than 2646000N/m in the embodiment; the rigidity difference of the two sides of the first frame, the second frame, the third frame and the fourth frame is not more than 147000N/m, and the rigidity difference of the two sides of the fifth frame, the sixth frame and the seventh frame is not more than 98000N/m.
Aiming at different steel types, in order to avoid serious deviation of the tail part of the strip steel at the rear part of the rack caused by overlarge wedge shape of the first rack, the third control unit 23 is used for controlling the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack to be consistent.
Here, the third control unit 23 is specifically configured to:
acquiring the current steel throwing direction of a previous frame of a current frame and the historical steel throwing direction of the current frame, and determining the roll gap leveling value of the current frame according to the current steel throwing direction of the previous frame and the historical steel throwing direction of the current frame;
adjusting the steel throwing direction of the current frame according to the roll gap leveling value of the current frame, so that the steel throwing directions of the third frame, the fourth frame, the fifth frame, the sixth frame and the seventh frame are consistent; wherein, the current frame includes: any one of a third rack, a fourth rack, a fifth rack, a sixth rack and a seventh rack.
For example, when the current stand is a third stand, the current steel throwing direction of the second stand and the historical steel throwing direction of the third stand need to be obtained, where the historical steel throwing direction is the steel throwing direction when the same specification steel grade is rolled.
Determining a roll gap leveling value of a third rack according to the current steel throwing direction of the second rack and the historical steel throwing direction of the third rack; and correspondingly adjusting the steel throwing direction of the third frame according to the roll gap leveling value of the third frame.
Similarly, when the steel throwing directions of the fourth rack, the fifth rack, the sixth rack and the seventh rack are determined, adjustment is performed according to the same method, and details are not repeated here.
The adjustment amount of the leveling value of the third rack is 0.1-0.2 mm; the adjustment quantity of the leveling value of the fourth rack is 0.1-0.15 mm.
For example, when roll gaps of the transmission side of F1 and F2 are controlled to lift according to preset roll gap distances, the tail of the strip steel deviates to the operation side in a rear F5-F7 rack, the roll gap leveling value of the F3 rack is determined according to the current steel throwing direction and the historical steel throwing direction of F2, and the roll gap levelness of the F3 rack is adjusted according to the corresponding roll gap leveling value; the levelness of the roll gap of the F4 stand is adjusted by the same method, so that the slight deviation of the strip steel in the F3 and the F4 is ensured, and the strip steel is prevented from seriously deviating. After the directions of F3 and F4 are determined, F5-F7 are adjusted. On the contrary, when the roll gaps of the F1 and the F2 operation sides are controlled to be lifted according to the preset roll gap distance, the tail of the strip steel can deviate towards the transmission side in the rear F5-F7 rack, the roll gap leveling value of the F3 rack is determined according to the current steel throwing direction of F2 and the historical steel throwing direction of F3, the roll gap levelness of the F3 rack is adjusted according to the corresponding roll gap leveling value, the roll gap levelness of the F4 rack is adjusted by the same method, and the strip steel is guaranteed to slightly deviate in the two racks of F3 and F4. Therefore, the serious deviation of the strip steel in the rear frame can be avoided.
It should be noted that, theoretically, the corresponding roll gap levelness is adjusted in sequence according to the sequence of each frame, but in the actual production process, because the steel throwing speed of the F5-F7 frames is faster, the adjustment is generally simultaneous, that is, because the directions of F3-F7 are consistent, the roll gap leveling value of the F5-F7 frames can also be determined according to F4.
The method and the device for controlling the tail flicking of the strip steel provided by the embodiment of the invention have the beneficial effects that at least:
the embodiment of the invention provides a method and a device for controlling the tail flicking of strip steel, which are applied to a strip steel rolling mill, wherein the rolling mill comprises the following steps: the device comprises a first rack, a second rack, a third rack, a fourth rack, a fifth rack, a sixth rack and a seventh rack; the method comprises the following steps: controlling the roll gap distance of the first frame to be A + B, wherein A is the initial roll gap distance of the first frame, and B is 0.15-0.5 mm; controlling the roll gap distance of the second rack to be C + B, wherein C is the initial roll gap distance of the second rack, and the roll gap distance of the second rack is smaller than the roll gap distance of the first rack; controlling the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack to be consistent based on the steel throwing directions of the first rack and the second rack; therefore, the tail of the strip steel has a wedge shape by increasing the roll gap distance between the first frame and the second frame, so that the steel throwing trend of the strip steel on the rear frame can be better controlled; the rigidity of the rolling mill is set, so that the phenomenon that the difference value of the rigidity of two sides of the rolling mill is increased, roll gaps on two sides bounce inconsistently due to the fact that the rigidity difference of the two sides is too large, and the formed wedge is difficult to control is avoided, and the phenomenon that the roll gap distance of the second rack is smaller than that of the first rack can be avoided, so that the phenomenon that the wedge of the tail portion of the strip steel on the third rack is too large can be avoided, and the deviation and the tail; meanwhile, the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack are controlled to be consistent, the tail of the strip steel is prevented from seriously deviating in the rear rack, and the tail of the strip steel is further prevented from drifting.
EXAMPLE III
In practical application, in a certain high-strength steel rolling production line, F1 and F2 racks are straight, F3 and F4 are inclined to the operating side, and F5-F7 are inclined to the transmission side and are large, so tail flicking occurs.
The method and the device provided by the embodiment adjust the rack of the production line, and the specific adjustment is as follows:
and controlling the roll gap at the transmission side of F1 to be lifted by 0.3mm and the roll gap at the transmission side of F2 to be lifted by 0.15mm, so that the tail part of the strip steel has a wedge shape on the first frame F1 and the second frame F2.
And determining roll gap leveling values of F3 and F4 according to the steel throwing directions of the strip steel at F1 and F2, wherein the roll gap leveling value adjustment amount of F3 is 0.1mm, and the roll gap leveling value adjustment amount of F4 is 0.15 mm. The rigidity of the F1-F4 is more than or equal to 2744000N/m, the rigidity of the F5-F7 is more than or equal to 2646000N/m, the rigidity difference of the F1-F4 frame is less than or equal to 147000N/m, and the rigidity difference of the rear frame F5-F7 is less than or equal to 98000N/m. And finally, the tail part of the strip steel is slightly deviated in the direction of F3, and the direction of F4 is slightly deviated.
The roll gap leveling value of the rear machine frame is determined by the F5-F7 machine frame according to the steel throwing direction of F4, and generally the roll gap leveling value of the F5-F7 machine frame is adjusted by 0.1-0.2 mm, so that the tail micro-deviation of the strip steel is controlled and the deviation of each machine frame is consistent.
When the method is applied to a first steel moving steel 1580 hot continuous rolling production line for rolling high-strength thin specifications, the tail flicking rate is reduced by 80%, the roll mark rate of all-steel is reduced from 1.02% to 0.23%, the product quality is improved, the roll is prevented from being damaged, and the service life of the roll is prolonged.
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 (8)
1. A method of controlling the tail flick of a steel strip for use in a strip rolling mill, said mill comprising: the device comprises a first rack, a second rack, a third rack, a fourth rack, a fifth rack, a sixth rack and a seventh rack; the method comprises the following steps:
controlling the roll gap distance of the first frame to be A + B, wherein A is the initial roll gap distance of the first frame, and B is 0.15-0.5 mm;
controlling the roll gap distance of the second rack to be C + B, wherein C is the initial roll gap distance of the second rack, and the roll gap distance of the second rack is smaller than the roll gap distance of the first rack; the roll gap distance is the roll gap distance of the transmission side or the roll gap distance of the operation side;
controlling the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack to be consistent based on the steel throwing directions of the first rack and the second rack; wherein the content of the first and second substances,
the controlling the steel throwing directions of the third frame, the fourth frame, the fifth frame, the sixth frame and the seventh frame to be consistent based on the steel throwing directions of the first frame and the second frame includes:
obtaining the historical steel throwing direction of a current frame and the current steel throwing direction of a previous frame of the current frame, and determining the roll gap leveling value of the current frame according to the current steel throwing direction of the previous frame and the historical steel throwing direction of the current frame;
adjusting the steel throwing direction of the current frame according to the roll gap leveling value of the current frame, so that the steel throwing directions of the third frame, the fourth frame, the fifth frame, the sixth frame and the seventh frame are consistent; wherein the current chassis includes: the third rack, the fourth rack, the fifth rack, the sixth rack, and the seventh rack.
2. The method of claim 1, wherein the stiffness values of the first, second, third, and fourth racks are not less than 2744000N/m, and the stiffness values of the fifth, sixth, and seventh racks are not less than 2646000N/m;
the rigidity difference of the two sides of the first frame, the second frame, the third frame and the fourth frame is not more than 147000N/m, and the rigidity difference of the two sides of the fifth frame, the sixth frame and the seventh frame is not more than 98000N/m.
3. The method of claim 1, wherein the adjustment of the leveling value of the third rack is 0.1-0.2 mm.
4. The method of claim 1, wherein the adjustment amount of the leveling value of the fourth rack is 0.1-0.15 mm.
5. A device for controlling the tail flick of a strip, for use in a strip rolling mill, said mill comprising: the device comprises a first rack, a second rack, a third rack, a fourth rack, a fifth rack, a sixth rack and a seventh rack; the device comprises:
the first control unit is used for controlling the roll gap distance of the first rack to be A + B, wherein A is the initial roll gap distance of the first rack, and B is 0.15-0.5 mm;
the second control unit is used for controlling the roll gap distance of the second rack to be C + B, wherein C is the initial roll gap distance of the second rack, and the roll gap distance of the second rack is smaller than the roll gap distance of the first rack; the roll gap distance is the roll gap distance of the transmission side or the roll gap distance of the operation side;
the third control unit is used for controlling the steel throwing directions of the third rack, the fourth rack, the fifth rack, the sixth rack and the seventh rack to be consistent; wherein the content of the first and second substances,
the third control unit is specifically configured to:
obtaining the historical steel throwing direction of a current frame and the current steel throwing direction of a previous frame of the current frame, and determining the roll gap leveling value of the current frame according to the current steel throwing direction of the previous frame and the historical steel throwing direction of the current frame;
adjusting the steel throwing direction of the current frame according to the roll gap leveling value of the current frame, so that the steel throwing directions of the third frame, the fourth frame, the fifth frame, the sixth frame and the seventh frame are consistent; wherein the current chassis includes: the third rack, the fourth rack, the fifth rack, the sixth rack, and the seventh rack.
6. The apparatus of claim 5, wherein the first, second, third, and fourth racks have a stiffness value of not less than 2744000N/m, and wherein the stiffness values of the fifth, sixth, and seventh racks are controlled to be not less than 2646000N/m;
the rigidity difference of the two sides of the first frame, the second frame, the third frame and the fourth frame is not more than 147000N/m, and the rigidity difference of the two sides of the fifth frame, the sixth frame and the seventh frame is controlled not to be more than 98000N/m.
7. The apparatus of claim 5, wherein the adjustment amount of the leveling value of the third frame is 0.1 to 0.2 mm.
8. The apparatus of claim 5, wherein the adjustment amount of the leveling value of the fourth frame is 0.1 to 0.15 mm.
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| CN201910587456.5A CN110328245B (en) | 2019-07-02 | 2019-07-02 | Method and device for controlling tail flicking of strip steel |
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| JPS61296912A (en) * | 1985-06-25 | 1986-12-27 | Kawasaki Steel Corp | Method for controlling camber of rolled material on thick plate rolling |
| KR101018124B1 (en) * | 2003-09-18 | 2011-02-25 | 주식회사 포스코 | Apparatus for controlling a bending and a level of strip in hot mill process |
| CN102581038B (en) * | 2011-01-14 | 2013-10-30 | 宝山钢铁股份有限公司 | Steel strip tail deviation control method |
| CN102641903B (en) * | 2011-02-16 | 2014-10-01 | 宝山钢铁股份有限公司 | Steckel mill rolled piece head-and-tail deviation control method |
| CN103464473A (en) * | 2013-08-23 | 2013-12-25 | 安阳钢铁股份有限公司 | Automatic adjustment method of finishing roll gap level |
| CN109570241B (en) * | 2017-09-29 | 2020-08-25 | 宝山钢铁股份有限公司 | Wedge-shaped control method with deviation protection |
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