CN110216151B - Control method for eliminating flying and warping of short-process ultrathin strip steel - Google Patents

Control method for eliminating flying and warping of short-process ultrathin strip steel Download PDF

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CN110216151B
CN110216151B CN201910440731.0A CN201910440731A CN110216151B CN 110216151 B CN110216151 B CN 110216151B CN 201910440731 A CN201910440731 A CN 201910440731A CN 110216151 B CN110216151 B CN 110216151B
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李波
田军利
高智
王青
赵敏
赵强
余晓龙
张亦辰
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Wuhan Iron and Steel Co Ltd
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/06—Thermomechanical rolling

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Abstract

The invention discloses a control method for eliminating flying and warping of short-process ultrathin strip steel, which comprises the conditions and parameters of rolling of a working roller of a rolling mill, threading speed of the strip steel, a dust removal water time sequence, micro double-side wave rolling, uneven wear of the working roller and reduction rate. Compared with the prior art, the invention solves the problem of flying and warping between the back-end frames when rolling the short-process ultrathin strip steel, solves the technical problems of unstable process and the like of rolling the short-process ultrathin strip steel, and realizes the purpose of high-quality and high-stability large-scale production of rolling the ultrathin hot-rolled strip steel with high quality in short process.

Description

Control method for eliminating flying and warping of short-process ultrathin strip steel
Technical Field
The invention relates to a strip steel production method, in particular to a control method for eliminating flying and warping of short-process ultrathin strip steel, and belongs to the technical field of hot-rolled strip manufacturing.
Background
The variety development of a CSP (sheet billet continuous casting and rolling production line) is limited by molten steel smelting and continuous casting processes initiated after a casting blank is thinned, but due to the characteristics of the CSP, compared with the conventional hot rolling, the CSP is more beneficial to producing thin materials, and meanwhile, the market potential of the thin materials is huge under the promotion of 'hot zone cooling'.
At present, when the extremely-thin strip steel is produced, the rolling speed is high, the head of the strip steel of an F6 frame and an F7 frame floats, if the rolling speed is low, the strip steel enters an F7 frame or goes out of the F7 frame and is turned over on a conveying roller way, if the rolling speed is high, the strip steel is directly stacked between an F6 frame and an F7 frame or on the conveying roller way, and the defects of product quality are further caused, such as F7 working rollers, coiling pinch roller roll marks and the like caused by the rolling, according to statistics of the production condition of the Wu steel, only 2015, the floating rolling on the head of the strip steel is unstable, so that the waste steel is 4 tons, the production is interrupted for 25 times, the production is stopped for 2956 minutes, the continuous casting speed is reduced for 5762 minutes, the scrap is 547.729 tons, the waste steel is 387.47 tons, the return furnace is 761.5 tons, and the direct loss of 839.04 ten thousand.
Research shows that when the thickness of a finished product rolled by a finishing mill group is less than or equal to 2.0mm, in the setting process of a rolling mill, due to a plurality of factors such as elastic flattening and roll gap bouncing of the rolling mill and a roll, the set roll gap of a frame of the rolling mill F4-F7 is close to 0mm, and after a plate blank is rolled in each pass, the head of the strip steel is in a tongue shape (the tongue shape extends to the middle part and is larger than two sides along the width direction of the strip steel), the tongue part of the head of the strip steel is small due to the small width of a deformation area, the elastic flattening and roll gap bouncing of the roll are small, so that the head of the strip steel can be thinned, and the thinning phenomenon is more; when the strip steel is threaded at a high speed, the strip steel can float upwards under the action of upward air flow (also called as chimney effect) formed by mill dedusting water, a dedusting fan and the like, and the strip steel is rolled and piled up to be waste due to the flying and warping of the extremely thin strip steel.
The Chinese patent publication No. CN108435803A, entitled production method for controlling the flying and warping of strip steel in a finishing mill, discloses: for a lower guide plate, a transition plate and a looper apron plate at the outlet of an F5 rack and an F6 rack of a finishing mill train, controlling the height difference between the lower guide plate and the transition plate to be between 5mm and 15mm, and controlling the height difference between the transition plate and the looper apron plate to be between 5mm and 15mm, wherein the lower guide plate is higher than the transition plate, and the transition plate is higher than the looper apron plate; and for the lower guide plates at the outlets of the F5 machine frame and the F6 machine frame, controlling the height of a gnawing mark or a step of the lower guide plates to be less than 5mm, and grinding the gnawing mark or the step. The purpose of controlling the flying and warping of the strip steel is realized by adjusting the specific structural parameters of the frame.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a control method for eliminating the flying and warping of the short-process ultrathin strip steel, solves the technical problems of unstable process of rolling the ultrathin strip steel in the short process and the like, and achieves the purpose of high-quality and high-stability large-scale production of rolling the ultrathin hot-rolled strip steel in the short process.
The ultrathin strip steel of the invention is a strip steel with the thickness of 0.8 to 1.6 mm.
The invention is realized by the following steps:
a control method for eliminating the flying warp of short-process ultrathin strip steel comprises the following parameters of controlling the rolling of a working roller of a rolling mill, the threading speed of the strip steel, the dust removal water time sequence, the micro-bilateral wave rolling, the uneven abrasion of the working roller and the rolling reduction rate, and specifically comprises the following steps:
(1) rolling control of working rolls of the rolling mill:
in order to prevent the strip steel from warping upwards when the strip steel is discharged from F6 and F7, the roll diameter of working rolls of F6 and F7 is configured to be slightly larger than that of a lower roll, and the roll configuration is as follows:
TABLE 1F 6/F7 work rolls and roll configurations
Rack Diameter/mm of work roll Rolling/mm
F6 565～595 +0.02～+0.03
F7 590～620 +0.01～+0.03
Wherein, the rolling adjustment is carried out along the radial direction.
(2) Controlling the threading speed of the strip steel:
threading speed of finish rolling in hot rolling: the head of the plate strip steel enters a finishing mill group, the strip steel passes out of a finishing mill tail rack, passes through laminar flow and a conveying roller way and finally passes through a coiling pinch roll and a coiling assisting roll to complete the complete biting speed, then the finishing mill group, the conveying roller way and the coiling machine group synchronously and integrally increase the speed, the low-speed strip threading is ensured, the stable operation of the head of the strip steel is realized, and the specific control parameters are as follows:
TABLE 2 threading speed for strip steel thickness
Thickness/mm of finished product Strip steel head threading speed m/s
0.8＜h≤1.2 9.4～9.6
1.2＜h≤1.4 10.0～10.2
1.4＜h≤1.6 10.3～10.5
(3) And (3) sequential control of dedusting water:
the rear section of the rack of the finishing mill group has more smoke dust and iron sheet ash, so an upper row of water nozzles and a lower row of water nozzles are generally arranged at the outlets of the racks F5-F7, when the strip steel is rolled, the upper row of water nozzles and the lower row of water nozzles simultaneously boil water to form a water curtain to inhibit the smoke dust and the iron sheet ash, and the aim of clean and environment-friendly production is fulfilled.
TABLE 3 DEDUST WATER OPEN TIME SEQUENCE FOR BAND-STEEL THICKNESS
Thickness/mm of finished product F6/m F7/m
0.8＜h≤1.2 40～38 44～42
1.2＜h≤1.4 37～35 41～39
1.4＜h≤1.6 31～29 37～35
Wherein, the opening time sequence is the time when the drainage nozzle of the frame is opened and starts to work.
(4) Rolling control of micro double side waves:
the control method for the micro double side waves is characterized in that the target flatness values of F6 and F7 are corrected from zero to a negative value, so that the corresponding work shifting roller before rolling the steel block moves to the negative value, the convexity control capability is improved, and the control method for the rolling with the micro double side waves is shown in a table 4.
TABLE 4 correction of matching parameters of rolling tonnage and flatness
Figure BDA0002071936560000031
Remarking: the tonnage noted in the brackets () is the corrected flatness values of F6 and F7 when the newly installed working roll is rolled to the tonnage.
(5) Uneven wear control of the working roll:
because the roll needs to be ironed after the new working roll is replaced, the working roll is generally in a stable state after rolling for 200 tons, and can start to roll an extremely thin material at the moment, and when the working rolls F6 and F7 roll 800-900 tons, medium waves are easy to generate and warping occurs. Therefore, when the sheet material with the thickness less than or equal to 1.6mm is continuously produced when the sheet material is rolled to 900 tons, the probability of warping is high, and each piece of steel can warp at F6 and F7 outlets in serious cases. Therefore, the work rolls are required to be treated as follows when rolling an extremely thin steel strip.
TABLE 5 transition principle for thickness of new work rolls
Figure BDA0002071936560000032
(6) F6 and F7 reduction rate control:
the finishing mill group F6-F7 mainly controls the shape of the strip steel. On the basis of automatic load distribution, the rolling load of the F6-F7 frame is manually corrected, the abrasion of F6-F7 is reduced, the uneven abrasion degree of the working roll is reduced, and the control is carried out according to the table 6 after field tracking and groping.
TABLE 6 correction of parameters for artificial load according to rolling thickness
Figure BDA0002071936560000041
The process principle of the present invention is illustrated below:
the invention controls the rolling of the working roll of the rolling mill. Because the angular velocities of the working rolls of the same frame are the same, the larger the diameter of the working roll is, the larger the linear velocity of the roll surface is, and the smaller the diameter of the working roll is, otherwise, the linear velocity of the roll surface is; the diameter of the working roll is large, the rolling deformation area of the strip steel is relatively long, the strip steel is expanded to be larger, and comprehensive factors are favorable for controlling the strip steel to warp.
The invention controls the threading speed of the strip steel. The reason is that the head of the strip steel is irregular, and the higher the strip steel passing speed is, the more easily the strip steel bounces and flies and warps on the channel line.
The invention controls the timing of the dedusting water. The strip steel passes through the front of the frame, the residence time of water on the upper surface of the strip steel is long, so that the upper surface and the lower surface of the strip steel are cooled unevenly, the temperature of the lower surface is higher, the extension amount is larger during rolling, the upper surface and the lower surface of the strip steel are asymmetrically bitten, the thickness of the strip steel is close to the thickness of a finished product when the strip steel is in F6 and F7, and the strip steel is easy to pass through and fly.
The invention controls the rolling of the micro double side waves. Because of adopting little bilateral wave, the upper and lower working rolls of the frame run negatively, help to increase the convexity of the belted steel, namely the centre thickness of the width direction of the belted steel is greater than the thickness of both sides more obviously, help to fly the control of warping more.
The invention controls the uneven wear control of the working roll. Because the temperature of the two sides of the strip steel in the width direction is lower than that of the middle part, after batch rolling, the abrasion of the two sides of the roller is more aggravated than that of the middle part, when the abrasion of the edge part reaches 1.3 times of that of the middle part (about 200um abrasion of the middle part and 260um abrasion of the edge part), when rolling is continued, the middle part of the strip steel extends more than that of the two sides, so that middle waves are easy to generate, and warping occurs.
The invention controls the rolling reduction rate. Because the reduction rate is too low, the roll bending force can not compensate the change of the rolling force, and the band steel is easy to generate uncontrolled bilateral wave shape; the reduction rate is too large, the temperature of the rear section rack is lower than that of the front section rack, the irregularity of metal extension is more prominent, the shape control is not facilitated, and the through plate rolling breakage and even steel scrap accidents are easy to happen.
Compared with the prior art, the invention solves the problem of flying and warping between the back-end frames when rolling the short-process ultrathin strip steel, solves the technical problems of unstable process and the like when rolling the short-process ultrathin strip steel, realizes the purpose of high-quality and high-stability large-scale production of rolling the ultrathin hot-rolled strip steel with the short-process ultrathin specification, and has the following effects:
① the method can be used without modification of equipment in the implementation process, and the existing equipment and control can be used;
② the method is suitable for rolling all the thin materials of the hot finishing mill group, and eliminates the problem of warping between the back section frames when rolling the thin strip steel;
③ the method is simple and easy to operate, and has high practicability.
④ except the un-biting steel pile which is transmitted from the bad plate shape of the front section frame to the back section frame, the flying and warping problem of F6 and F7 in the rolling process of the extremely thin strip steel is basically eliminated, the generation amount of waste and defective products is reduced, and the smooth and stable production is facilitated.
Detailed Description
The invention is further illustrated by the following specific examples:
the first embodiment is as follows: SPHC-B was produced to a thickness of 0.8 mm.
① rolling mill working roll:
Figure BDA0002071936560000051
② threading speed of steel strip:
thickness/mm of finished product Strip steel head threading speed m/s
0.8 9.41
③ dedusting water sequence:
Figure BDA0002071936560000052
④ rolling of micro double side waves:
Figure BDA0002071936560000053
⑤ uneven wear of work rolls:
Figure BDA0002071936560000061
⑥ F6 and F7 reduction ratios:
Figure BDA0002071936560000062
the effect is as follows: the problem of strip steel warping does not occur all the year round.
Example two: SPHC-B was produced to a thickness of 1.0 mm.
① rolling mill working roll:
Figure BDA0002071936560000063
② threading speed of steel strip:
thickness/mm of finished product Strip steel head threading speed m/s
1.0 9.52
③ dedusting water sequence:
Figure BDA0002071936560000064
④ rolling of micro double side waves:
Figure BDA0002071936560000065
⑤ uneven wear of work rolls:
Figure BDA0002071936560000071
⑥ F6 and F7 reduction ratios:
Figure BDA0002071936560000072
the effect is as follows: the problem of strip steel warping does not occur all the year round.
Example three: SPHC-B was produced to a thickness of 1.2 mm.
① rolling mill working roll:
Figure BDA0002071936560000073
② threading speed of steel strip:
thickness/mm of finished product Strip steel head threading speed m/s
1.2 9.6
③ dedusting water sequence:
Figure BDA0002071936560000074
④ rolling of micro double side waves:
Figure BDA0002071936560000075
⑤ uneven wear of work rolls:
Figure BDA0002071936560000081
⑥ F6 and F7 reduction ratios:
Figure BDA0002071936560000082
the effect is as follows: the problem of strip steel warping does not occur all the year round.
Example four: Q215B was produced to a thickness of 1.3 mm.
① rolling mill working roll:
Figure BDA0002071936560000083
② threading speed of steel strip:
thickness/mm of finished product Strip steel head threading speed m/s
1.3 10.1
③ dedusting water sequence:
Figure BDA0002071936560000084
④ rolling of micro double side waves:
Figure BDA0002071936560000085
⑤ uneven wear of work rolls:
Figure BDA0002071936560000091
⑥ F6 and F7 reduction ratios:
Figure BDA0002071936560000092
the effect is as follows: the problem of strip steel warping does not occur all the year round.
Example five: Q215B was produced to a thickness of 1.4 mm.
① rolling mill working roll:
Figure BDA0002071936560000093
② threading speed of steel strip:
thickness/mm of finished product Strip steel head threading speed m/s
1.4 10.18
③ dedusting water sequence:
Figure BDA0002071936560000094
④ rolling of micro double side waves:
Figure BDA0002071936560000095
⑤ uneven wear of work rolls:
Figure BDA0002071936560000101
⑥ F6 and F7 reduction ratios:
Figure BDA0002071936560000102
the effect is as follows: the problem of strip steel warping does not occur all the year round.
Example six: SAE1006 was produced with a thickness of 1.5 mm.
① rolling mill working roll:
Figure BDA0002071936560000103
② threading speed of steel strip:
thickness/mm of finished product Strip steel head threading speed m/s
1.5 10.41
③ dedusting water sequence:
Figure BDA0002071936560000104
④ rolling of micro double side waves:
Figure BDA0002071936560000105
⑤ uneven wear of work rolls:
Figure BDA0002071936560000111
⑥ F6 and F7 reduction ratios:
Figure BDA0002071936560000112
the effect is as follows: the problem of strip steel warping does not occur all the year round.
Example seven: SAE1006 was produced with a thickness of 1.6 mm.
① rolling mill working roll:
Figure BDA0002071936560000113
② threading speed of steel strip:
thickness/mm of finished product Strip steel head threading speed m/s
1.6 10.49
③ dedusting water sequence:
Figure BDA0002071936560000114
④ rolling of micro double side waves:
Figure BDA0002071936560000115
⑤ uneven wear of work rolls:
Figure BDA0002071936560000121
⑥ F6 and F7 reduction ratios:
Figure BDA0002071936560000122
the effect is as follows: the problem of strip steel warping does not occur all the year round.
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.

Claims (3)

1. A control method for eliminating the flying warp of short-flow ultrathin strip steel comprises the conditions and parameters of controlling the rolling of working rolls of a rolling mill, the threading speed of the strip steel, the dust removal water time sequence, the micro-bilateral wave rolling, the uneven abrasion of the working rolls and the reduction rate, and is characterized in that:
(1) rolling control of working rolls of the rolling mill:
the configured upper roll of the roll diameters of the F6 and F7 working rolls is slightly larger than the lower roll, wherein the diameter of the working roll of the frame F6 is 565-595 mm, the roll diameter is + 0.02- +0.03mm, the diameter of the working roll of the frame F7 is 590-620 mm, and the roll diameter is + 0.01- +0.03 mm;
(2) controlling the threading speed of the strip steel:
setting different strip steel threading speeds according to different thicknesses h of finished strip steel;
when h is more than 0.8mm and less than or equal to 1.2mm, the threading speed of the head of the strip steel is 9.4-9.6 m/s;
when h is more than 1.2mm and less than or equal to 1.4mm, the threading speed of the head of the strip steel is 10.0-10.2 m/s;
when h is more than 1.4mm and less than or equal to 1.6mm, the threading speed of the head of the strip steel is 10.3-10.5 m/s;
(3) and (3) sequential control of dedusting water:
setting different dust removal water starting time sequences according to different thicknesses h of finished strip steel;
when h is more than 0.8mm and less than or equal to 1.2mm, the dedusting water is opened when the strip steel on the frame F6 passes through 40-38 m, and the strip steel on the frame F7 passes through 44-42 m;
when h is more than 1.2mm and less than or equal to 1.4mm, the dedusting water is started when the strip steel on the frame F6 passes through 37-35 m, and is started when the strip steel on the frame F7 passes through 41-39 m;
when h is more than 1.4mm and less than or equal to 1.6mm, the dedusting water is opened when the strip steel on the frame F6 passes through 31-29 m, and the strip steel on the frame F7 passes through 37-35 m;
(4) rolling control of micro double side waves:
setting different flatness correction values of F6 and F7 according to the difference of the thickness h of the finished strip steel;
when h is more than 0.8mm and less than or equal to 1.2mm, the flatness correction values of F6 and F7 are-1 when the steel is rolled to 300 tons, and the flatness correction values of F6 and F7 are-2 when the steel is rolled to 500 tons;
when h is more than 1.2mm and less than or equal to 1.4mm, the straightness correction values of F6 and F7 are-1 when the rolling is carried out to 400 tons, and the straightness correction values of F6 and F7 are-2 when the rolling is carried out to 600 tons;
when h is more than 1.4mm and less than or equal to 1.6mm, the straightness correction values of F6 and F7 are-1 when the rolling is carried out to 400 tons, and the straightness correction values of F6 and F7 are-2 when the rolling is carried out to 600 tons;
(5) uneven wear control of the working roll:
setting different production time periods of the working rolls according to different thicknesses h of the finished strip steel;
when h is more than 0.8mm and less than or equal to 1.2mm, the new working roll starts to produce the strip steel after rolling to 350 tons, and the new working roll is replaced after rolling to 850 tons;
when h is more than 1.2mm and less than or equal to 1.4mm, the new working roll starts to produce the strip steel after rolling to 300 tons, and the new working roll is replaced after rolling to 900 tons;
when h is more than 1.4mm and less than or equal to 1.6mm, the new working roll starts to produce the strip steel after rolling to 200 tons, and the new working roll is replaced after rolling to 1200 tons;
(6) f6 and F7 reduction rate control:
according to the difference of the thickness h of the finished strip steel, the rolling load of the F6-F7 stand is corrected manually, and the abrasion of F6-F7 is reduced;
when h is more than 0.8mm and less than or equal to 1.2mm, the load correction value of F6 is-9 to-7 percent, and the load correction value of F7 is-13 to-11 percent;
when h is more than 1.2mm and less than or equal to 1.4mm, the load correction value of F6 is-7 to-5 percent, and the load correction value of F7 is-11 to-9 percent;
when h is more than 1.4mm and less than or equal to 1.6mm, the load correction value of F6 is-5 to-3 percent, and the load correction value of F7 is-9 to-7 percent.
2. The control method for eliminating the flying and warping of the short-process ultrathin strip steel as claimed in claim 1, wherein:
the thickness of the ultrathin strip steel is 0.8-1.6 mm.
3. The control method for eliminating the flying and warping of the short-process ultrathin strip steel as claimed in claim 1, wherein:
the threading speed is the speed at which the head of the plate strip steel enters the finishing mill group until the head of the strip steel comes out of the finishing mill frame and completely bites the strip steel through laminar flow, a conveying roller way, and finally a coiling pinch roll and a coiling assistant roll.
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