CN101648220B - Method for online detection of roll cooling - Google Patents
Method for online detection of roll cooling Download PDFInfo
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- CN101648220B CN101648220B CN2008100417245A CN200810041724A CN101648220B CN 101648220 B CN101648220 B CN 101648220B CN 2008100417245 A CN2008100417245 A CN 2008100417245A CN 200810041724 A CN200810041724 A CN 200810041724A CN 101648220 B CN101648220 B CN 101648220B
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Abstract
The invention provides a method for online detection of roll cooling, which comprises the following steps: coating a coating material with the thickness of 0.01 to 0.05 millimeter on the surface of a roll; placing the coated roll into a stander in a normal production state; jetting cooling water onto the fixed roll for 5 to 6 minutes; and judging the working condition of a roll cooling water system according to the peeling-off state of the coating material on the surface of the roll so that the cooling problems such as nozzle abrasion, blockage, deflection, frame deformation and the like can be timely discovered. The method has accuracy and timeliness, and can improve the productivity and ensure the safety of production.
Description
Technical field
The present invention relates to the roll cooling of finishing stand in the field of metallurgy, particularly, the present invention relates to a kind of online test method of roll cooling.
Background technology
Hot fine rolling seven frame tandem mills belong to the unit of most critical in the whole piece rolling line, also be hot-strip from semi-finished product to the last unit that goes out finished product.Because the roll cooling water in the frame is arranged and is installed on the wiper of frame guide plate, in daily production process, often because of steel scrap in guide plate wearing and tearing, blastic deformation and the frame causes frame deformation, cause that roll cooling water water nozzle is out of shape, comes off, the position changing of the relative positions and the finishing roll cooling is gone wrong.
As cooling water deviation is appearred in the coverage rate of working roll, jet angle changes, and cooling water nozzle spout bore weares and teares through high-pressure injection, and former segment angle changes etc., makes roll can not get effective cooling.It is fatal that the cooling of hot-rolling mill roll goes wrong, the roll shape convexity is undergone mutation, it is bad to cause the band steel end face that is shut out plate shape to occur, make product not reach customer requirements and become degradation product or waste product, heavy then make roll temperature distortion uneven generation roll surface crackle or the generation of quick-fried roller accident.
The angular deflection of roll cooling water water nozzle, abrasion deformation, roll surface cover and badly will bring following problem respectively in finish rolling is produced:
1, roll cooling water corners of the mouth degree deflects and understands the problem that produces
The roll cooling realizes by the cooling water nozzle that is installed on the frame guide plate, and the standard that strictness is installed of nozzle, whole row's arrangement of nozzles is defined on the central line by drawing, and each nozzle is all by central line deflection 15 degree.Only guarantee whole nozzle deflection angles 15 the degree positions, can guarantee that just the coverage rate of the sector angle of the crossing between every group of cooling water nozzle and the nozzle is guaranteed, finally guarantee effective cooling of roll.The angle overshoot scope in case deflect, fan-shaped coverage rate just can not guarantee that roll can not get effectively cooling and produce various uncertain faults such as facial cleft line or quick-fried roller.
2, roll cools off the problem that the water nozzle abrasion deformation can produce
Roll cooling water nozzle uses some cycles, in use owing to be difficult to confirm the water nozzle normal cycle, therefore generally all carries out batch replacement when biennial annual overhaul in the past, does not have identifiable normal cycle.Arrive to a certain degree but work as the water nozzle spout abrasion, the pressure of beating on roller from the water of nozzle ejection also can change, and the main foundation of roll cooling is flow and hitting power, in case hitting power changes, cooling effect can obvious reduction.But will find nozzle wear hitting power deficiency in process of production, present prior art is the feasible and effective means of neither one also.
3, the bad problem that can produce of roll surface coverage condition
Roll for hot-rolling is in work under the high temperature all the time, general minimum belt steel temperature also will be about 900 degree, and under all normal situation of nozzle exit pressure, flow, the unique decision of cooling effect quality be exactly the coverage rate quality, determine that roll works in frame, in time judge the state that cooling water breaker roll roll surface covers, do not have the method that to use for reference so far.
With Baosteel 2050 continuous hot-rolling mills is example; it was gone into operation existing 17 years so far; but aspect the safe handling of roll be a blind area always; special roll cooling water detection method is not arranged during former design yet; in the daily production in the past; owing to never find fine solution; finishing roll roll surface in use repeatedly occurs and peels off unusually because of the oxide-film that inhomogeneous cooling causes; the serious fire check of roll surface; accidents such as quick-fried roller take place; not only caused a large amount of nonscheduled down times and the loss of production capacity, also often given the Baosteel reputation simultaneously and make a big impact because of the strip shape quality objection.This cover milling train is embodied in the following aspects in the hidden danger that roll cooling secure context exists at present:
When 1) designing milling train originally, the roll that uses substantially all is common high chromium roller and infinitely chilled ductile cast iron roller, requirement to cooling is not high especially, and with the continuous development of technology, product quality requires to improve constantly, all promote the use of high-speed steel roll now, and the characteristic of this roll is high especially to the cooling requirement, lacks the safe handling that rational cooling water detection side rule can't guarantee roll.
2) the original product of producing of this cover milling train is based on straight carbon steel, and present hot-rolled product is based on variety steel, the wearing and tearing of frame guide plate and wiper and impact failure are than in the past more serious, the cooling water nozzle distortion that thereupon brings, the coverage rate that angular deflection, jet angle variation cause is inhomogeneous more outstanding, also needs a kind of feasible method and in time finds variety of issue.
3) high-speed steel roll that uses at present must be checked its cooling effect regularly, and index that the conclusion neither one of cooling effect quality quantizes or direct determination methods.Depend down machine roll roller temperature alone and judge, can only find problem and can not find the method for solution, also make roll in use have hidden danger.
4) find the roller temperature height in the past production, can only guarantee the security of roll by controlled rolling rhythm, but cause the roller temperature plateau because of being hard to know.And now guarantee that by controlled rolling rhythm the security of roll is unrealistic, has only the problem of fundamentally finding out cooling, promptly find a kind of new technology that can accurately judge rolling water cooling problem method, could guarantee neither to influence the safety that production capacity guarantees that again roll uses.
Along with continually developing of hot rolling variety steel, also more and more obtained paying attention to by the roll safety that everybody paid close attention to.However, the inventor finds, at continuous hot-rolling mill also unspecial feasible method and measure, perhaps there be not to provide the correlation technique of inspection at present about the angular deflection of roll cooling water water nozzle, abrasion deformation, roll surface coverage condition at roll cooling water state.
In order to reduce the accident relevant and to the influence of product quality with roll as far as possible, generally all utilize to examine and determine and repair and roll change enters frame and carries out visual inspection, as water nozzle stop up, come off, these obvious problems of gross distortion can get rid of by visual inspection.But because of problems such as wearing and tearing, frame deformation and water nozzle angular deflection then are difficult to be resolved by the range estimation means.In case and these hidden danger exist, the normal use of breaker roll brings huge threat, be badly in need of finding a kind of method that can thoroughly solve hidden danger for this reason, guarantee roll for hot-rolling relieved use under the guaranteed situation of safety, also constantly promote simultaneously the end face quality and the strip shape quality of hot-strip, satisfy user's various different demands.
Summary of the invention
For overcoming the problems referred to above, the object of the present invention is to provide a kind of online test method of the roll state of cooling, the online test method of the described roll state of cooling can accurately be monitored the method for roll water cooling problem, the obstruction that takes place of monitoring cooling water water nozzle in time, come off, problems such as gross distortion, wearing and tearing, frame deformation and water nozzle angular deflection, guarantee the safety that roll uses and the quality of product.
Online test method according to the roll state of cooling of the present invention said method comprising the steps of:
(1) roll to be measured is coated with coats;
(2) under the ordinary production status condition, pack in the frame applying roll behind the coating;
(3) above-mentioned roll is maintained static, open the roll cooling water, the hydraulic pressure of described cooling water is 1bar to 10bar, and roll surface was sprayed 5-6 minute;
(4) take out roll, judge the duty of roll cooling water according to the situation of peeling off of roll surface coating.
Roll is generally silver gray, and the color of selected coating needs with the roll color obvious differentiation is arranged.Usually can select conventional oil lacquer for use, as medium blue phenolic ready-mixed paint, dark blue phenolic ready-mixed paint, in red phenolic ready-mixed paint, dark red phenolic ready-mixed paint, middle yellow phenolic ready-mixed paint, deep yellow phenolic ready-mixed paint etc.
Be preferably, the thickness of described roll roll surface coating is 0.01mm-0.05mm.
Be preferably, the build when described coating applies is 10～25 μ m/ times.
The roll that will be used to test applied in 25～45 minutes in advance, and when guaranteeing that roll pushes frame, paint film is in leather hard.Can carry out accommodation to timing node and the coating thickness that applies according to the coating type of environment temperature and roll roll surface, also can determine according to summary of experience repeatedly specific roll ideal time node and coating thickness carry out the roll roll surface and apply.
Method of the present invention can come into plain view and find water nozzle obstruction, deflection, jet angle, coverage rate and the framework quality situation of roll in frame, and situation about obtaining according to test is carried out corresponding specific aim and handled, and not only accurately but also quick, guarantees the safe handling of roll.Its effect and advantage are as follows:
1. realize online quick test of roll cooling water and adjustment: method of the present invention is to adopt to apply roll technology to the guide plate in the finishing stand, wiper and a kind of state-of-the-art technology method that superincumbent nozzle wear, distortion, deflection and coverage rate situation of change are tested fast is installed, and whole test process only needs 12 minutes.
2. realize the online accurately judgement directly perceived of roll cooling water: under all normal situation of nozzle exit pressure, flow, the unique decision of cooling effect quality be exactly the coverage rate quality, the technology of the present invention method can determine the duty of roll intuitively, the judgement that the angular deflection of cooling water nozzle, jet angle is changed problems such as the coverage rate that causes is inhomogeneous comes into plain view, can accurately judge the hitting power of indivedual roll cooling water nozzles especially, overcome and to have found in process of production that in the past individual nozzles hits hypodynamic problem after wearing and tearing.
Description of drawings
Fig. 1 is the work schematic diagram when roll cools off among the present invention.
Unit is the last unit of whole piece rolling line among the figure, wherein, 1. topping roll, 2. bottom roll, 3. upper spider cooling device, 4. the lower bearing bracket cooling device is 5. gone up water discharging board, 6. descends water discharging board.
The specific embodiment
When finding that roller temperature raises, can adopt the cooling system of following method breaker roll to detect.
Embodiment 1
1) the roll roll surface applies:
The coating that is coated in the roll roll surface is selected principle for use: enough adhesive force is arranged, can clearly retain the strike track of roll cooling water under the strike of 10bar roll cooling water simultaneously.Select medium blue phenolic ready-mixed paint (F03-1, standard No. Q/GHTC25) in the present embodiment, this mixed paint has good gloss and physical and mechanical properties, can be dry at normal temperatures, but also low temperature drying.Preparation needs the roll of installation check roll cooling water, and the roll that will be used to test shifts to an earlier date 25-45 minute and applies and is equipped with in machine other stand-byly, and when guaranteeing that roll pushes frame, paint film is in leather hard.Under 25 ℃ environment temperature, the paint thickness that the roll roll surface applies is controlled at 0.01mm～0.05mm, and even with the brushing method brushing, the build of brushing is 10～25 μ m/ times;
2) online location confirmation: after online roll is extracted out, cut off the roll cooling water, ready coating roll roller is packed in the frame, and guide plate is squeezed into frame, the roll state when remaining on ordinary production, Fig. 1 is seen in the position when roll gap is overwhelmed general production.Unit among Fig. 1 is the last unit of whole piece rolling line, the cooling water that upper spider cooling device 3 and lower bearing bracket cooling device 4 spray is respectively applied for cooling topping roll 1 and bottom roll 2, and last water discharging board 5 and following water discharging board 6 are respectively applied for the cooling water that stops that upper spider cooling device 3 and lower bearing bracket cooling device 4 spray; Confirm with torch whether the roll gap position is reasonable;
3) online roll cooling water is set: the paint roller of the frame of packing into does not allow to rotate, confirm various physical locations with torch, then the roll cooling water is all opened, carried out hydraulic pressure by finish rolling operating desk roll cooling water main menu and set, hydraulic pressure is controlled at 1bar～10bar;
4) online roll cooling water hits: apply after roll packs in the frame, spray with the roll cooling water and promptly close cooling water after about 5～6 minutes; (if the time sprays long meeting and roll surface is painted other position also sprays, and is unfavorable for confirming, too short might not reach desired effect);
5) the roll off-line is confirmed: will test the coating roll and extract out in frame, and carry out the situation of peeling off of the coating coating of roll surface and confirm, and check the actual coverage rate and the angle of roll cooling water, and obtain the online duty of determining of roll cooling water;
6) online cooling water nozzle is adjusted: by the affirmation to roll surface paint situation, therefrom can see the cooling effect of actual roll when frame is worked intuitively, respective nozzle be taked measures such as adjustment or replacing according to the existing problems specific aim.
Duty with reference to the standard breaker roll cooling water of table 1 is judged.
By the paint roller after the test is estimated, if having, the vestige of discovery on roll surface not a direction deflection, hitting vestige shows chaotic random, utilize roll change and periodical repair time, the relevant experienced professional of group checks one by one to the spray header of correspondence, the horizontal deflection angle adjustment of going forward side by side, under the situation of range estimation no problem, arrange the paint roller test once more, be resolved up to original problem and promptly thought normal.
The solution of roll cooling water nozzle abrasion deformation:
Peel off situation from the paint roller roll surface of test, utilize roll change and periodical repair time to carry out specially nozzle affirmation one by one, check nozzle diameter with torch, and corresponding paint roller mask body situation, specific aim is checked, has or not situations such as steel scrap in the recent period in conjunction with machine time, frame on the water nozzle, whether determine nozzle exchange, under the situation of range estimation no problem, arrange the paint roller test once more, when being resolved, original problem promptly thinks normal.
The solution that the roll surface coverage condition is bad:
Paint roller roll surface coverage condition from test, utilizing roll change and periodical repair time to carry out specialized nozzles confirms, check nozzle diameter with torch, deflection angle, to the frame Wiper blade framework that water nozzle is installed, comprehensively framework is tested, confirm that mainly framework is to moderate, distortion situation, extension corner wear etc., handle accordingly, and carry out the paint roller test once more, whether be resolved with the affirmation problem.
Apply the qualitative method that the roll roll surface is confirmed:
When the paint roller in the frame of packing into when the roll of each mechanical location during with normal operation in normal is the same, opened the roll cooling water 5～6 minutes, we extract paint roller out frame and estimate then, if the roll surface paint flake by strike place is even, or the paint face is clear by the vestige that water hits, coverage rate do not take hit less than phenomenon, just on the circumference angle that roll is wished, think does not substantially have too big problem to the strike vestige, otherwise judges that then problem is arranged.
Apply the quantitative approach that the roll roll surface is confirmed:
When the paint roll that is drawn out of; range estimation confirms that roll surface paint does not peel off substantially; or it is very unintelligible to hit vestige; all nozzles confirm that on roll vestige is irregular, if surpass nozzle quantity 1/4 part all with 15 degree deflections on request; in principle frame is checked affirmation; and, follow the tracks of its roller temperature concrete condition again according to this frame roll surface spalling of oxide film situation in process of production, final decision is shut down and whether is handled.
Described coating is dark blue phenolic ready-mixed paint, and dope applying method is spraying, and the build during spraying is 10-15 μ m/ time, and hydraulic pressure is 7bar-10bar, and other are with embodiment 1.
Described coating is dark red phenolic ready-mixed paint, and the build during spraying is 15-25 μ m/ time, and hydraulic pressure is controlled to be 1bar-5bar.Other are with embodiment 1.
The criterion and the countermeasure of table 1 roll cooling of the present invention
| State | Criterion | Countermeasure |
| Nozzle wear | Coverage rate is from 60mm-100mm | Surpassing the upper limit promptly changes |
| Spray nozzle clogging | 1, nozzles clear does not have the foreign matter obstruction; 2, continuous, the N/D of roll surface strike track. | 1, there is foreign matter in time to dredge in the range estimation nozzle; 2, roll surface hits the invalid timely replacing nozzle of the discontinuous or damaged mediation of track. |
| Nozzle deflection | 1, roll surface strike track is neat; 2, nozzle hits deflection angle 15 ± 1 degree. | The nozzle deflection angle of relevant position is adjusted to 15 degree. |
| The water discharging board deflection | The both sides roll surfaces hits track and roll bus to be departed from and is controlled at 2mm. | 1, by the water discharging board framework hang the angle be adjusted to qualified; 2, can't adjust replacing water discharging board assembly. |
As from the foregoing, the online test method of roll cooling of the present invention can accurately be judged the duty of roll cooling water, thus, can in time find problems such as cooling water nozzle wear, obstruction, deflection, improve the production capacity of roll, guaranteed the security that roll is produced.
Claims (2)
1. the online test method of a roll cooling is characterized in that, said method comprising the steps of:
(1) roll to be measured is coated with coats, the thickness of described roll roll surface coating is 0.01-0.05mm;
When (2) treating that paint film is in leather hard, under the ordinary production status condition, pack in the frame applying roll behind the coating;
(3) above-mentioned roll is maintained static, open the roll cooling water, the hydraulic pressure of described cooling water is 1bar to 10bar, and roll surface was sprayed 5-6 minute;
(4) take out roll, judge the duty of roll cooling water according to the situation of peeling off of roll surface coating:
Apply the qualitative method that the roll roll surface is confirmed:
When the coating roll in the frame of packing into when the roll of each mechanical location during with normal operation in normal is the same, opened the roll cooling water 5～6 minutes, extracting coating roll out frame then estimates, if peeled off evenly by the roll surface coating of strike place, or be coated with that charge level is clear by the vestige that water hits, coverage rate do not have to hit less than phenomenon, just on the circumference angle that roll is wished, think does not substantially have too big problem to the strike vestige, otherwise judges that then problem is arranged;
Apply the quantitative approach that the roll roll surface is confirmed:
When the coating roll that is drawn out of, range estimation confirms that roll surface coating does not peel off substantially, or it is very unintelligible to hit vestige, all nozzles confirm that on roll vestige is irregular, if surpass nozzle quantity 1/4 part all with 15 degree deflections on request, in principle frame is checked affirmation, and, follow the tracks of its roller temperature concrete condition again according to this frame roll surface spalling of oxide film situation in process of production, final decision is shut down and whether is handled; The both sides roll surfaces hits track and roll bus to be departed from and is controlled at 2mm and judges that then water discharging board is normal.
2. the online test method of roll cooling according to claim 1 is characterized in that the build when described coating applies is 10～25 μ m/ times.
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| CN2008100417245A CN101648220B (en) | 2008-08-15 | 2008-08-15 | Method for online detection of roll cooling |
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| CN2008100417245A CN101648220B (en) | 2008-08-15 | 2008-08-15 | Method for online detection of roll cooling |
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| CN101648220A CN101648220A (en) | 2010-02-17 |
| CN101648220B true CN101648220B (en) | 2011-11-23 |
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| CN102062621A (en) * | 2010-11-11 | 2011-05-18 | 神龙汽车有限公司 | Nozzle detection method by spraying engine cylinder body and cylinder cover |
| CN102172642B (en) * | 2010-12-30 | 2013-01-16 | 一重集团大连设计研究院有限公司 | Spray nozzle fault detection method for finely cooling device of cold rolling mill |
| CN102247995A (en) * | 2011-05-26 | 2011-11-23 | 攀钢集团有限公司 | Method for detecting and regulating cooling effect of roller and roller cooling device |
| CN102941233B (en) * | 2011-08-16 | 2015-12-16 | 上海宝钢工业检测公司 | A kind of roll automatic detecting machine frame and detection method |
| CN105414189A (en) * | 2015-12-18 | 2016-03-23 | 重庆麦拓科技有限公司 | Rolling mill and roller box thereof |
| CN106694569A (en) * | 2017-01-09 | 2017-05-24 | 首钢京唐钢铁联合有限责任公司 | Method for detecting failure of cooling nozzles of finish rolling working rolls |
| CN107175261B (en) * | 2017-06-08 | 2019-01-22 | 唐山钢铁集团有限责任公司 | A kind of online test method of hot-strip working roll cooling work state |
| DE102019217569A1 (en) * | 2019-06-25 | 2020-12-31 | Sms Group Gmbh | Flatness measuring device for measuring the flatness of a metallic strip |
| CN111649923A (en) * | 2020-05-29 | 2020-09-11 | 首钢京唐钢铁联合有限责任公司 | Detection method and detection device for anti-stripping water header of finishing mill |
| CN113553738B (en) * | 2021-07-01 | 2022-11-15 | 邯郸钢铁集团有限责任公司 | Fatigue life prediction method for hot-rolled plate strip rolling mill |
| CN114453438A (en) * | 2022-01-06 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Method for evaluating cooling effect of roller cooling water |
| CN114618885A (en) * | 2022-02-15 | 2022-06-14 | 唐山钢铁集团有限责任公司 | Method for testing water sealing effect of water scraping plate of hot rolling working roll |
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