CN103240280B - Hot-rolled steel strip vertical stripe defect eliminating method - Google Patents
Hot-rolled steel strip vertical stripe defect eliminating method Download PDFInfo
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- CN103240280B CN103240280B CN201310156711.3A CN201310156711A CN103240280B CN 103240280 B CN103240280 B CN 103240280B CN 201310156711 A CN201310156711 A CN 201310156711A CN 103240280 B CN103240280 B CN 103240280B
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Abstract
The invention discloses a hot-rolled steel strip vertical stripe defect eliminating method. The method includes reducing the rotary speed of a grinding wheel, increasing the rotary speed of a roller during the process of rough grinding and fine grinding, reducing the rotary speed of the roller during the process of first half fine grinding, reducing the rotary speed of the roller during the processes of second half fine grinding and third half fine grinding, reducing the speed of a layer board, and reducing the contact pressure of the grinding wheel and the roller face and increasing the number of fine grinding passes. By the method, impression traces on a working roller of F4-F6 in the grinding process can be eliminated completely, and good effect can be achieved. Meanwhile, the curve radius difference of a finishing mill group end frame working roller of CVC (continuous variable crown) type is controlled in a range less than or equal to 0.75mm (0.625mm is selectable), and high grinding efficiency is improved. The hot-rolled steel strip vertical stripe defect eliminating method has the advantages of convenience in operation, significance in effect and high accuracy, and qualified raw materials are provided for producing cold rolling products, namely automobile plates, house appliance plates and the like, with high-level surface quality requirements.
Description
Technical field
The invention belongs to technical field of steel rolling, particularly a kind of method eliminating hot-strip longitudinal stripe defect.
Background technology
05 surface rolling plate is mainly used on large-area external member, as the position such as roof, car door, car bonnet, wing, rear side wall of sedan limousine.
So-called " 05 surface " is Deutsche industry norm (DIN) DIN1623-I to the given one mark of flat cold-rolled sheet surface quality.It requires the necessary zero defect in the front of plate, has and does not affect its painting knee or the rear uniform outward appearance of high-quality of plating.Concrete quality requirement is, as being used as body shell (for 4 cars), excellent of steel plate of polishing does not allow there is following defect without oilstone: slight crack, corrosion (comprising a rust), Coolant Stains, bonding, edge are damaged, batched sliding injury, the marking, oxide skin pit, scratch, annealing limit, smooth flower and athwart sea etc.For such as roof, door, luggage-boot lid etc., at excellent except except the unallowed defect of body shell, also should not exist to close and scab, and steel plate can not showing above-mentioned defect after oilstone polishing, as impression and athwart sea etc. yet.
05 Automobile Plate user requires surface quality zero-fault, but longitudinal stripe problem is that (within 2008, western mark provides from moving steel one hot rolling replacing precision rolling working roll CVC roll shape, within 2009, start to apply) occur afterwards, almost move all rolling coil of strips of steel one hot rolling and all have longitudinal stripe, affect presentation quality, test tracking results simultaneously and show that cold-rolled process can not be eliminated, have influence on the surface quality of follow-up finished product, the surface quality requirements of 05 Automobile Plate can not be met.Although promote hot rolling to have done some grinding tests, effect is all not good.
Polishing inspection being carried out to the chill rewinding that twists in after cold rolling, finding that belt steel surface still has the longitudinal stripe along rolling to distribution.Find during follow-up investigations, after hot rolled coil pickling, cold rolling before, surface be namely distributed with " longitudinal stripe " that spacing is 20mm rule.Hot rolling aspect has been carried out questions and prospect and has been searched, and finds that the emery wheel impression mark that mm finishing mill unit working roll exists is the reason causing this kind of problem.
Follow the tracks of hot rolling scaduled moving steel, before rolling, the emery wheel print of breaker roll has carried out distance measurement, after rolling, has carried out uncoiling, also measure fringe spacing to coil of strip.Fringe spacing on steel plate and the emery wheel of roll print spacing and fit like a glove, and spacing is also 20mm.
See Fig. 2, in prior art, the roll shape employing semidiameter of milling train end breast roller is the CVC roll shape of 1mm, and the grinding process parameters of employing is as follows:
| Parameter | Corase grind | The first half fine grindings | The second half fine grindings | 3 half fine grinding | Fine grinding | Fine grinding |
| Grinding wheel speed, m/s | 38 | 38 | 38 | 38 | 38 | 38 |
| Roll rotational speed, rpm | 40 | 45 | 45 | 45 | 60 | 60 |
| Planker speed, mm/min | 3800 | 3600 | 3500 | 2800 | 1800 | 1300 |
| Continue the amount of feeding, mm/min | 0.2 | 0.05 | 0.02 | 0.01 | 0 | 0 |
| Amount of feeding increment, mm | 0.02 | 0.01 | 0.005 | 0.005 | 0 | 0 |
| Contact, % | 40 | 11 | 11 | 11 | 9 | 5 |
| Road sub-quantity | 3 | 2 | 1 | 1 | 1 | 1 |
After grinding, emery wheel print spacing is 20mm.
In sum, longitudinal stripe defect is common in cold rolling Ultra-low carbon steel grade, and defect is generally along steel plate genesis analysis, and striped rolls out now in logical, and is distributed in whole plate width direction; Striped is light and dark, and obviously, contrast of fringes normal substrate in daylight is partially white, and width of fringe is generally between 5-20mm in light and shade boundary.As the cold rolling common deficiency of one, cold-reduced sheet surface longitudinal striped is the main cause causing cold-reduced sheet top grade rate to reduce.This defect makes surface of steel plate occur aberration, causes the bad direct use affecting lower procedure production and user of follow-up coating effect; In addition, this defect also can accelerate steel plate corrosion, causes the wasting of resources and material safety to reduce.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method eliminating hot-strip longitudinal stripe defect, can realize eliminating on working roll while abrasive grinding wheel impression mark, ensure roll dressing efficiency.
For solving the problems of the technologies described above, the invention provides a kind of method eliminating hot-strip longitudinal stripe defect, comprising:
Grinding process parameters is set, is specially and reduces grinding wheel speed, increase corase grind and refining stage roll rotational speed, reduce by the first half refining stage roll rotational speeds, increase by the second half fine grinding and the 3 half refining stage roll rotational speeds, reduce supporting plate speed, reduce emery wheel and roll surface contact and increase and refine road sub-quantity and realize eliminating emery wheel impression mark on working roll;
By mm finishing mill unit end frame working roll CVC roller curve semidiameter is controlled within the scope of 0-0.75mm, realize improving grinding efficiency.
A kind of method eliminating hot-strip longitudinal stripe defect provided by the invention, by increasing roll rotational speed, reducing grinding wheel speed, reduce planker speed, reducing emery wheel and roll surface contact and increase and refine passage, thoroughly can eliminate the emery wheel impression mark in grinding process on F4 ~ F6 working roll, reach good effect.Meanwhile, by mm finishing mill unit end frame working roll CVC roller curve is controlled within the scope of 0-0.75mm (optional 0.625mm), raising grinding efficiency is achieved.And the present invention also has easy and simple to handle, that Be very effective, accuracy are high feature, for the cold-rolled products such as Automobile Plate and appliance plate producing high-grade surface quality requirements provide qualified raw material.
Accompanying drawing explanation
A kind of Method And Principle block diagram eliminating hot-strip longitudinal stripe defect that Fig. 1 provides for the embodiment of the present invention.
Fig. 2 is that the roll shape of milling train end breast roller in prior art adopts semidiameter to be the CVC roller curve of 1mm.
Fig. 3 adopts semidiameter to be the CVC roller curve of 0.625mm for a kind of roll shape eliminating the end of milling train in the method for hot-strip longitudinal stripe defect breast roller that the embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention provided by the invention is described in further detail.
See Fig. 1, a kind of method eliminating hot-strip longitudinal stripe defect that the embodiment of the present invention provides, comprising:
1., grinding process parameters is set:
By reducing grinding wheel speed, increase corase grind and refining stage roll rotational speed, reduce by the first half refining stage roll rotational speeds, increase by the second half fine grinding and the 3 half refining stage roll rotational speeds, reduce supporting plate speed, reduce emery wheel and roll surface contact and increase and refine road sub-quantity and realize eliminating emery wheel impression mark on working roll;
2., by mm finishing mill unit end frame working roll CVC roller curve semidiameter is arranged in the scope of 0-0.75mm, realize improving grinding efficiency.
In the present embodiment, preferably, the concrete setting value of grinding process parameters is:
| Parameter | Corase grind | The first half fine grindings | The second half fine grindings | 3 half fine grinding | Fine grinding | Fine grinding |
| Grinding wheel speed, m/s | 35 | 35 | 35 | 30 | 30 | 30 |
| Roll rotational speed, rpm | 45 | 40 | 50 | 55 | 65 | 65 |
| Planker speed, mm/min | 3500 | 3500 | 2500 | 1500 | 800 | 400 |
| Continue the amount of feeding, mm/min | 0.2 | 0.05 | 0.02 | 0.01 | 0 | 0 |
| Amount of feeding increment, mm | 0.02 | 0.01 | 0.005 | 0.005 | 0 | 0 |
| Contact, % | 20～40 | 10 | 10 | 10 | 8 | 4 |
| Road sub-quantity | 4 | 4 | 3 | 2 | 2 | 2 |
；
In the present embodiment, preferably, roller curve semidiameter is 0.625mm.
A kind of method eliminating hot-strip longitudinal stripe defect that the present embodiment provides, in actual application, by reducing grinding wheel speed, increase corase grind and refining stage roll rotational speed, reduce by the first half refining stage roll rotational speeds, increase by the second half fine grinding and the 3 half refining stage roll rotational speeds, reduce supporting plate speed, reduce emery wheel and roll surface contact and increase and refine road sub-quantity, thoroughly can eliminate the emery wheel impression mark in grinding process on F4 ~ F6 working roll, reach good effect.Simultaneously, owing to adjusting according to above-mentioned test parameters in grinding process, then add the grinding time, adopt above-mentioned test grinding parameter, grinding roll needs about 60 minutes, (existing technological parameter, grinding roll, needs 28 ~ 30 minutes), therefore, the present invention also by mm finishing mill unit end frame working roll three CVC roller curve semidiameters are arranged on≤scope of 0.75mm in (optional 0.625mm), realize improving grinding efficiency.
A kind of method eliminating hot-strip longitudinal stripe defect that the present embodiment provides, by adopting the mode optimized roll shape and combine with optimization grinding process parameters, eliminate abrasive grinding wheel impression mark on working roll, thorough radical cure has been carried out to the longitudinal stripe defect that broad hot strip surface occurs, while can realizing thoroughly solving Surfaces of Hot Rolled Strip longitudinal stripe defect problem, ensure roll dressing efficiency.The embodiment of the present invention also has easy and simple to handle, that Be very effective, accuracy are high feature, for the cold-rolled products such as Automobile Plate and appliance plate producing high-grade surface quality requirements provide qualified raw material.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. eliminate a method for hot-strip longitudinal stripe defect, it is characterized in that, comprising:
Grinding process parameters is set:
By reducing grinding wheel speed, increase corase grind and refining stage roll rotational speed, reduce by the first half refining stage roll rotational speeds, increase by the second half fine grinding and the 3 half refining stage roll rotational speeds, reduce supporting plate speed, reduce emery wheel and roll surface contact and increase and refine road sub-quantity and realize eliminating emery wheel impression mark on working roll;
Mm finishing mill unit end frame working roll CVC roller curve semidiameter is arranged within the scope of 0-0.75mm.
2. a kind of method eliminating hot-strip longitudinal stripe defect according to claim 1, is characterized in that, the concrete setting value of described grinding process parameters is:
。
3. a kind of method eliminating hot-strip longitudinal stripe defect according to claim 1, is characterized in that:
Described roller curve semidiameter is 0.625mm.
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| CN103801567B (en) * | 2014-02-10 | 2016-01-27 | 山西太钢不锈钢股份有限公司 | Eliminate the method for Cold Rolling rib line |
| CN105215791A (en) * | 2014-06-27 | 2016-01-06 | 张红超 | Minute surface Roller Machining method and utilize the method for this minute surface Roller Machining minute surface aluminium sheet |
| CN108788941B (en) * | 2018-07-06 | 2020-10-02 | 攀钢集团西昌钢钒有限公司 | Grinding method of CVC roller |
| CN110340149B (en) * | 2019-07-19 | 2021-01-26 | 首钢京唐钢铁联合有限责任公司 | Method for grinding a roll |
| CN111660151A (en) * | 2020-05-12 | 2020-09-15 | 首钢集团有限公司 | Production method and device of galvanized steel sheet |
| CN113500098B (en) * | 2021-08-20 | 2023-04-07 | 山西太钢不锈钢股份有限公司 | Method for eliminating rolling chromatic aberration of ultrapure ferrite stainless steel by five-rack six-roller continuous rolling mill |
| CN114986260B (en) * | 2022-05-27 | 2024-07-16 | 湖南华菱涟源钢铁有限公司 | Method for grinding roller and mirror roller |
| CN116079507B (en) * | 2023-03-15 | 2024-09-06 | 西北有色金属研究院 | Grinding method of high-precision roller for rolling micron-sized rare metal foil |
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| CN101417403A (en) * | 2008-12-03 | 2009-04-29 | 宝钢集团常州轧辊制造公司 | Method for grinding and processing Sendzimer roller |
| CN101417342A (en) * | 2008-12-03 | 2009-04-29 | 宝钢集团常州轧辊制造公司 | High-hardness roller processing method |
| CN102581712A (en) * | 2012-03-27 | 2012-07-18 | 首钢总公司 | Method for grinding plain roll from plain profile into CVC (continuous variable crown) profile |
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| JP2923095B2 (en) * | 1991-08-20 | 1999-07-26 | 住友金属工業株式会社 | Roll for rolling, polishing method thereof and metal plate rolling method |
| JP2942023B2 (en) * | 1991-08-23 | 1999-08-30 | 住友金属工業株式会社 | Roll for rolling, polishing method thereof and rolling method of metal plate |
| JPH0857755A (en) * | 1994-08-23 | 1996-03-05 | Sumitomo Metal Ind Ltd | Rolling roller surface polishing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101417403A (en) * | 2008-12-03 | 2009-04-29 | 宝钢集团常州轧辊制造公司 | Method for grinding and processing Sendzimer roller |
| CN101417342A (en) * | 2008-12-03 | 2009-04-29 | 宝钢集团常州轧辊制造公司 | High-hardness roller processing method |
| CN102581712A (en) * | 2012-03-27 | 2012-07-18 | 首钢总公司 | Method for grinding plain roll from plain profile into CVC (continuous variable crown) profile |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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