CN107541737B - The method for improving belt steel surface pickling quality - Google Patents
The method for improving belt steel surface pickling quality Download PDFInfo
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- CN107541737B CN107541737B CN201610481433.2A CN201610481433A CN107541737B CN 107541737 B CN107541737 B CN 107541737B CN 201610481433 A CN201610481433 A CN 201610481433A CN 107541737 B CN107541737 B CN 107541737B
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Abstract
The present invention provides a kind of methods for improving belt steel surface pickling quality, comprising: the ratio Ψ 1 of iron scale on the unit area on the surface of the strip is detected before the strip enters shot-blasting machine；The ball blast amount P of the shot-blasting machine to jettisoning is controlled according to the ratio Ψ 1 of the iron scaleqWith ejection velocity Pv；The pickling flow F in descaling bath is controlled according to the ratio Ψ 1 of the iron scale.The method of raising belt steel surface pickling quality of the invention, the case where iron scale of belt steel surface, is detected using surface defects detection technology before ball blast, pickling, and real-time control adjustment is carried out to ball blast, pickling process according to testing result, to guarantee the uniformity of board surface quality after pickling.
Description
Technical field
The present invention relates to the ball blast pickling technology in a kind of metallurgical industry, in particular to a kind of raising belt steel surface pickling matter
The method of amount.
Background technique
To obtain great surface quality, the strip after hot rolling and normalizing annealing needs to remove incoming band steel table before cold rolling
The iron scale of layer.Ball blast, pickling are the common technologies for being used to remove belt steel surface iron scale at present.
For annealing and pickling continuous production process, the surface quality and pickling operating efficiency after pickling are both by preceding process
The structure of supplied materials iron scale and the influence of distribution, also by this process acid cleaning process parameter such as pickling medium, acid strength, pickling
The influence of temperature, pickling flow and pickling speed.Under normal circumstances, the speed of production of continuous annealing pickling unit is constant
, acid strength and pickling temperature are substantially and fixed since adjustment time is long.Therefore, the surface quality master after pickling
To depend on the structure and distribution situation, ball blast technique and pickling flow of supplied materials iron scale.
The structure and distribution situation of supplied materials iron scale by the hot-rolled production process such as strip of strip chemical component, heating
The influence of the composite factors such as calorific value, time inside furnace, high pressure water dephosphorization, finishing temperature, coiling temperature, the section cooling of furnace, simultaneously
Also with furnace atmosphere, furnace temperature, water cooling rate in normalizing annealing process etc. because being known as substantial connection.Obviously, numerous influences because
If have in element it is one or more occur fluctuating all the structure that will lead to supplied materials iron scale and distribution are changed.That is, supplied materials
Structure type of the iron scale in strip length direction and width direction be it is different, distribution be also it is non-uniform.
At present for the different positions of the different coil of strips of same steel grade and same coil of strip in the controlling of production process of annealing and pickling
It sets and is all made of identical, fixed ball blast, acid cleaning process, there is no consider strip in the difference of different location iron scale.Strip
The defects of plate face after pickling owes pickling, overpickling, color difference exists simultaneously, and not only board surface quality is uneven, but also production process
In pellet consumption, acid consumption it is also larger.
When coils of hot-rolled steel scale structure and distribution change, the technological parameter that can be changed in ball blast, pickling cannot
Dynamic adjustment is done according to the fluctuation of supplied materials, the defects of plate face after leading to strip pickling owes pickling, overpickling, color difference while being deposited
, and the difference of the surface quality of different coil of strips and same coil of strip different location is obvious；For the different coil of strips of same steel grade
And the control that the different location of same coil of strip is all made of identical, fixed ball blast, acid cleaning process is also unfavorable for pellet consumption and acid consumes
System increases the pollution that waste also exacerbates environment.
Summary of the invention
The object of the present invention is to provide a kind of method for improving belt steel surface pickling quality, the inspection based on surface defect
It surveys to adjust the parameter of ball blast and acid cleaning process, to realize stable, uniform pickling, guarantees the quality of belt steel surface after pickling
Uniformity.
The method of raising belt steel surface pickling quality of the invention, comprising: detected before the strip enters shot-blasting machine
The ratio Ψ 1 of iron scale on the unit area on the surface of the strip；It is controlled according to the ratio Ψ 1 of the iron scale described
The ball blast amount P of shot-blasting machine to jettisoningqWith ejection velocity Pv；The pickling in descaling bath is controlled according to the ratio Ψ 1 of the iron scale
Flow F.
Further, this method further include: detect the unit plane on the surface of the strip in the exit of the descaling bath
The ratio Ψ 2 of iron scale in product；It is repaired according to ratio Ψ 1 of the ratio Ψ 2 of the iron scale to the iron scale
Just.
Preferably, the ratio Ψ 1 according to the iron scale controls each ball blast amount jettisoninged of the shot-blasting machine
PqWith ejection velocity PvIt include: to calculate the ball blast amount P according to the following formulaq: Pq=K1+3152 Ψ 1-4080 Ψ 12+1969Ψ
13；And the ejection velocity P is calculated according to the following formulav: Pv=K2+253.7 Ψ 1-405.7 Ψ 12+209.6Ψ13, wherein
K1 and K2 is constant, and 180≤K1≤200 and 18≤K2≤22.
Preferably, described that pickling flow F in descaling bath is controlled including according to such as according to the ratio Ψ 1 of the iron scale
Lower formula calculates the pickling flow F:F=K3+103.4 Ψ 1, wherein K3 is constant, and 35≤K3≤40.
Preferably, the ratio Ψ 2 according to the iron scale is modified packet to the ratio Ψ 1 of the iron scale
It includes: calculating correction factor according to the following formula: E=K4+0.5938 Ψ 2-0.6523 Ψ 22+0.9963Ψ23, wherein K4 is normal
Number, and 0.95≤K4≤1.05；And the ratio Ψ 1 by E Ψ 1 as the revised iron scale.
The method of raising belt steel surface pickling quality of the invention, uses surface defects detection technology before ball blast, pickling
The case where iron scale of belt steel surface, is detected, and real-time control is carried out to ball blast, pickling process according to testing result
Adjustment, to guarantee the uniformity of board surface quality after pickling.
Detailed description of the invention
Fig. 1 is the structural schematic diagram using the production line of the method for raising belt steel surface pickling quality of the invention；
Fig. 2 is the flow chart of the method for raising belt steel surface pickling quality of the invention.
Specific embodiment
The method of raising belt steel surface pickling quality of the invention is made into one with reference to the accompanying drawings and detailed description
The detailed description of step, but it is not as a limitation of the invention.
Fig. 1 show the structure of the production line of the method using raising belt steel surface pickling quality of the invention.Strip 12
Welding 2 is carried out after 1 uncoiling of uncoiler, then after the annealing of continuous annealing furnace 3, the cooling of cooling section 4, is passed sequentially through
First detection device 5, shot-blasting machine 6, descaling bath 7, circle shear 8 and the second detection device 9, finally enter coiling machine 10.Its
In, the first detection device 5, shot-blasting machine 6, descaling bath 7 and the second detection device 9 are all connected to computer 11.
In conjunction with reference Fig. 1 and Fig. 2, the method for raising belt steel surface pickling quality of the invention includes the following steps: in band
Steel 12 enters before shot-blasting machine 6, and the ratio of the iron scale of unit area on the surface of strip 12 is detected by the first detection device 5
Example Ψ 1；Oxygen on the unit area on the surface of the strip 12 detected according to second detection device 9 in the exit of descaling bath 7
The ratio Ψ 2 for changing iron sheet, is modified the ratio Ψ 1 of iron scale；Shot-blasting machine 6 is controlled according to the ratio Ψ 1 of iron scale
The ball blast amount P to jettisoningqWith ejection velocity Pv；The pickling flow F in descaling bath 7 is controlled according to the ratio Ψ 1 of iron scale.
Specifically, the first detection device 5 may include the camera for being separately positioned on the upper and lower of strip 12, for real-time
Obtain the image of the upper and lower surface of strip 12.In order to comprehensively, equably be examined to the surface quality of the upper and lower surface of strip 12
It surveys, the acquisition that multiple cameras carry out image can be evenly arranged in the length and width direction of strip 12；Each width is acquired
Image calculate the ratio Ψ 1, i of iron scale, then to the ratio Ψ 1 of all iron scales, i carries out statistical average and obtains band
The ratio Ψ 1 of the iron scale of unit area on the surface of steel 12.The strip 12 on production line is carried out by multiple groups camera
Continuous scanning, to realize the detection to the overall length of strip 12, wide, upper and lower surfaces all positon surface state of full plate.
The position and density of camera and the frequency for acquiring image should be able to guarantee each part to strip 12
All cover.
Since the defect on 12 surface of strip is different, the intensity of the surface reflection light of strip 12 can be because of the table of strip 12
The state in face changes.With light source illumination bands steel 12, camera acquires the image after 12 reflection source of strip, according to image
In each pixel gray value, detect the ratio Ψ of iron scale in the unit area of strip 12 in the image of each width acquisition
1,i。
Above-mentioned detection process can be completed by computer 11.
Shot-blasting machine 6 conveys for ball blast and removes the iron scale of belt steel surface.Usually in the upper of strip 12 in shot-blasting machine 6
Lower surface respectively have it is multiple jettisoning, each jettisoning can be with independent control.6 machine of ball blast is controlled according to the ratio Ψ 1 of iron scale
Each ball blast amount P to jettisoningqWith ejection velocity PvIt specifically includes: calculating the ball blast amount P according to the following formulaq: Pq=K1+
3152Ψ1-4080Ψ12+1969Ψ13；And the ejection velocity P is calculated according to the following formulav: Pv=K2+253.7 Ψ 1-
405.7Ψ12+209.6Ψ13, wherein K1 and K2 is constant, and 180≤K1≤200 and 18≤K2≤22.
Descaling bath 7 is used to clean the iron scale on 12 surface of strip.Pickling temperature, acid strength in descaling bath 7 are only
Static parameter relevant to the steel grade of strip 12, and pickling flow F is the iron scale ratio with 12 surface of strip detected
The relevant dynamic variable of Ψ 1.Controlling the pickling flow F in descaling bath 7 according to the ratio Ψ 1 of iron scale includes according to following public
Formula calculates the pickling flow F:F=K3+103.4 Ψ 1, wherein K3 is constant, and 35≤K3≤40.
It is identical as the testing principle of the first detection device 5 in the second detection device 9 that the exit of descaling bath 7 is arranged, it uses
It is then right according to the ratio Ψ 2 of iron scale in the ratio Ψ 2 of the iron scale on the unit area on the surface of detection strip 12
The ratio Ψ 1 of iron scale is modified.Specific modification method are as follows: calculate correction factor according to the following formula: E=K4+
0.5938Ψ2-0.6523Ψ22+0.9963Ψ23, wherein K4 is constant, and 0.95≤K4≤1.05；And E Ψ 1 is made
For the ratio Ψ 1 of the revised iron scale.The control of ball blast and pickling is carried out with the ratio Ψ 1 of revised iron scale
System is more conducive to improve the surface quality of strip 12.
The method of raising belt steel surface pickling quality of the invention, uses surface defects detection technology before ball blast, pickling
The case where iron scale of belt steel surface, is detected, and real-time control is carried out to ball blast, pickling process according to testing result
Adjustment, to guarantee the uniformity of board surface quality after pickling.
The above specific embodiment is only exemplary embodiments of the present invention, it is impossible to be used in limits the present invention, the present invention
Protection scope be defined by the claims.Those skilled in the art can within the spirit and scope of the present invention, to this
Various modifications or equivalent replacements are made in invention, these modifications or equivalent replacement also should be regarded as being within the scope of the present invention.
Claims (4)
1. a kind of method for improving belt steel surface pickling quality characterized by comprising
The ratio Ψ 1 of iron scale on the unit area on the surface of the strip is detected before the strip enters shot-blasting machine；
The ball blast amount P of the shot-blasting machine to jettisoning is controlled according to the ratio Ψ 1 of the iron scaleqWith ejection velocity Pv；
The pickling flow F in descaling bath is controlled according to the ratio Ψ 1 of the iron scale；
The ratio Ψ 1 according to the iron scale controls each ball blast amount P to jettisoning of the shot-blasting machineqAnd ejection velocity
PvInclude:
The ball blast amount P is calculated according to the following formulaq:
Pq=K1+3152 Ψ 1-4080 Ψ 12+1969Ψ13；And
The ejection velocity P is calculated according to the following formulav:
Pv=K2+253.7 Ψ 1-405.7 Ψ 12+209.6Ψ13,
Wherein, K1 and K2 is constant, and 180≤K1≤200 and 18≤K2≤22.
2. the method according to claim 1 for improving belt steel surface pickling quality, which is characterized in that further include:
The ratio Ψ 2 of iron scale on the unit area that the surface of the strip is detected in the exit of the descaling bath；
It is modified according to ratio Ψ 1 of the ratio Ψ 2 of the iron scale to the iron scale.
3. the method according to claim 1 for improving belt steel surface pickling quality, which is characterized in that described according to the oxygen
The pickling flow F changed in the control descaling bath of ratio Ψ 1 of iron sheet includes calculating the pickling flow F according to the following formula:
F=K3+103.4 Ψ 1,
Wherein, K3 is constant, and 35≤K3≤40.
4. the method according to claim 2 for improving belt steel surface pickling quality, which is characterized in that described according to the oxygen
The ratio Ψ 2 for changing iron sheet, which is modified the ratio Ψ 1 of the iron scale, includes:
Correction factor is calculated according to the following formula:
E=K4+0.5938 Ψ 2-0.6523 Ψ 22+0.9963Ψ23,
Wherein, K4 is constant, and 0.95≤K4≤1.05；And
Ratio Ψ 1 by E Ψ 1 as the revised iron scale.
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| CN108342741B (en) * | 2018-03-26 | 2019-11-05 | 泰兴市东城水处理工程有限公司 | A kind of method for surface treating copper foil |
| CN111992589B (en) * | 2019-05-27 | 2022-03-18 | 宝山钢铁股份有限公司 | BMD production line speed control method based on strip steel surface brightness detection |
| CN112126938B (en) * | 2020-08-31 | 2023-01-10 | 首钢智新迁安电磁材料有限公司 | Method and device for controlling surface quality of strip steel |
| CN113670941A (en) * | 2021-08-30 | 2021-11-19 | 宝钢湛江钢铁有限公司 | Method for online quantitative evaluation of oxidation color defects on surface of multifunctional continuous annealing strip steel |
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| CN102126185A (en) * | 2010-09-29 | 2011-07-20 | 杭州九龙厨具制造有限公司 | Shot peening process for removing scale on surface of steel belt |
| CN102286751A (en) * | 2011-06-04 | 2011-12-21 | 首钢总公司 | Method for judging pickling speed in cold rolling pickling technology |
| CN102400156A (en) * | 2010-09-19 | 2012-04-04 | 天津市亿博制钢有限公司 | Pickling method of hot-rolled coil |
| CN104451723A (en) * | 2014-10-16 | 2015-03-25 | 武汉钢铁(集团)公司 | Method for improving acid washing efficiency and quality of hot rolled strip steel |
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Patent Citations (4)
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|---|---|---|---|---|
| CN102400156A (en) * | 2010-09-19 | 2012-04-04 | 天津市亿博制钢有限公司 | Pickling method of hot-rolled coil |
| CN102126185A (en) * | 2010-09-29 | 2011-07-20 | 杭州九龙厨具制造有限公司 | Shot peening process for removing scale on surface of steel belt |
| CN102286751A (en) * | 2011-06-04 | 2011-12-21 | 首钢总公司 | Method for judging pickling speed in cold rolling pickling technology |
| CN104451723A (en) * | 2014-10-16 | 2015-03-25 | 武汉钢铁(集团)公司 | Method for improving acid washing efficiency and quality of hot rolled strip steel |
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