CN105149562B - A kind of method for clearing up twin-roll thin strip continuous casting roll surface - Google Patents
A kind of method for clearing up twin-roll thin strip continuous casting roll surface Download PDFInfo
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- CN105149562B CN105149562B CN201510642921.2A CN201510642921A CN105149562B CN 105149562 B CN105149562 B CN 105149562B CN 201510642921 A CN201510642921 A CN 201510642921A CN 105149562 B CN105149562 B CN 105149562B
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Abstract
A kind of method for clearing up twin-roll thin strip continuous casting roll surface, roll surface cleaning device include, two brush rolls, respectively parallel crystallization roll arrangement, and cylindrical, its periphery is implanted with elongated metal wire as bristle；Brush roll both ends are provided with bearing block；Bearing block rear portion sets pressure sensor；Two motors, couple two brush rolls respectively；Two hydraulic cylinders, are acted on bearing block by pressure sensor, drive brush roll to be adjacent to or leave crystallization roll；Two hydraulic cylinder control loops set servo valve respectively；Displacement transducer is set on hydraulic cylinder；One controller, pressure sensor, displacement transducer and two hydraulic cylinder servo valves are electrically connected with the controller；Methods described includes, brush roll cleaning roll surface, and the product that the ratio of itself and crystallization roll velocity of rotation is multiplied by brush roll density in planting is greater than 1, and the bristles bend amount e of brush roll is maintained at 0.5%~2.5%.The present invention improves the effect of roll surface cleaning device cleaning crystallization roll, ensures that crystallization roll roll surface oxide-film is uniformly distributed, improves casting strip quality.
Description
Technical field
The present invention relates to continuous casting process, more particularly to a kind of method for clearing up twin-roll thin strip continuous casting roll surface.
Background technology
Twin-roll thin strip continuous casting technology is as a kind of short route metallurgical technology technology, its typical production process：The steel of melting
Water direct pouring is formed in a space surrounded by two the opposite crystallization rolls for rotating and having refrigerating function and side seal board
Molten bath, molten steel are cooled simultaneously and then solidified in crystal roller surface, and Thin Strip Steel, Thin Strip Steel are finally formed at crystallization roll minimum gap
Batched after hot rolling and cooling, be manufactured directly to hot-rolled finished product volume.
Molten steel, which has many metals or nonmetallic evaporation in process of setting and forms oxide, is deposited on Metal Substrate
On body, and one layer of sull is formed on its surface, because the fusing point of these oxides is less than the fusing point of steel, it is possible to increase steel
The heat conduction intensity of water.But if the cumulative thickness of oxide-film is uneven to cause the setting rate difference of molten steel, and then cause
Strip surface cracks or the defects of shrinkage cavity, it is therefore desirable to which it is unnecessary to remove crystal roller surface using a kind of apparatus and method
Oxide, the oxide thickness uniformity of crystal roller surface is efficiently controlled, improve surface quality of casting belt.
Therefore, most of thin strap continuous casting research institutions employ roll hairbrush (hereinafter referred to as brush roll) as mainly clear
Science and engineering has and means, and brush roll is adjacent to crystallization roll roll surface using certain pressure, and utilizes the speed difference of the two so that brushing
Hair and crystallization roll roll surface phase mutual friction deposit so as to remove roll surface oxide.
When cleaning crystallization roll roll surface, the bristle that brush roll needs certain pressure to contact with crystallization roll produces bending,
Good cleaning effect could be produced, but is produced as the extension of activity duration, the bristle wear of brush roll shorten, roll neck becomes
It is small, value when now the cylindrical bristle density in planting of brush roll is already higher than initial input, now need to change some brush rolls
Using parameter, such as pressure, rotating speed, it just can guarantee that the forward and backward brush roll of abrasion is consistent to the cleaning effect of crystallization roll.
The content of the invention
It is an object of the invention to provide a kind of method for clearing up twin-roll thin strip continuous casting roll surface, cast in twin-roll thin strip continuous casting
During, the effect of roll surface cleaning device cleaning crystallization roll is improved, ensures that crystallization roll roll surface oxide-film is uniformly distributed, improves Cast Strip
Quality.Present invention double-roll type strip caster, cast thickness 0.5-5mm metal casting band.
To reach above-mentioned purpose, the technical scheme is that：
A kind of thin band continuous casting crystallization roller roll surface cleaning device, crystallization roll arrangement is corresponded to respectively；It includes, two brush rolls,
Parallel crystallization roll arrangement respectively, and positioned in the setting up and down of the non-pool side of every crystallization roll；Brush roll is cylindrical, its periphery
Elongated metal wire is implanted with as bristle；Brush roll both ends are provided with bearing block；Bearing block rear portion is respectively arranged with pressure sensing
Device；Two motors, couple two brush rolls respectively；Two hydraulic cylinders, are acted on bearing block by pressure sensor, drive hair
Brush roll is adjacent to or left crystallization roll；Two hydraulic cylinder control loops set servo valve respectively；Displacement sensing is set on the hydraulic cylinder
Device；One controller, the pressure sensor, displacement transducer and two hydraulic cylinder servo valves are electrically connected with the controller；Hairbrush
The cylindrical bristle density in planting of roller is arranged between 12~30%, and bristle density in planting is the bristle in the cylindrical upper unit area of brush roll
Sectional area percentage.
The method for cleaning of thin band continuous casting crystallization roller roll surface of the present invention, it is characterized in that, two brush rolls of roll surface cleaning device
Respectively under hydraulic cylinder and motor driven, rotate and held out against close to crystallization roll, and with certain pressure in crystallization roll roll surface；With
The lasting progress of prune job, controller infer that its density in planting changes according to the cylindrical change of brush roll, correspondingly, pass through control
Servo valve drives hydraulic cylinder to drive brush roll to advance, and hydraulic cylinder displacement is predicted by displacement transducer, to keep the bristle of brush roll
Amount of bow e is maintained at 0.5%~2.5%；Amount of bow e setting formula is as follows：
Wherein：e：Bristles bend amount, %；
r0：Brush roll initial diameter, mm；
r1：Brush roll working diameter, mm.
Further, during brush roll rotates cleaning roll surface, it relatively rotates velocity ratio with crystallization roll and is multiplied by brush roll
The product of density in planting is greater than 1, i.e.,：
Wherein：V1：Brush roll linear velocity, m/min；
V2：Crystallization roll linear velocity, m/min；
λ：Brush roll density in planting, %.
Further, in brush roll serious wear, after its cylindrical density in planting is more than 35%, by by its outer ring
Looks, be processed into spiral wave shape or spiral saw tooth form reduce its surface density in planting after be continuing with.
Also, the control system of roll surface cleaning device calculates the situation of change of its density in planting, phase according to brush roll wear extent
Ground is answered to change the velocity of rotation of brush roll；Wherein, the cylindrical bristle density in planting of brush roll is arranged between 12~30%, and bristle is planted
All bristle sectional area proportions in density i.e. 1 square decimeter；Brush roll exradius and density in planting follow following formula：
Wherein：d0：For brush roll original outer diameter, mm；
dn：External diameter after being worn for brush roll, mm；
ρ0：The a diameter of d of brush roll0When density in planting, %；
ρn：The a diameter of d of brush rollnWhen density in planting, %.
The molten steel of melting is formed in the space that two the opposite crystallization rolls for rotating and having refrigerating function and side seal board surround
Molten bath, molten steel are cooled simultaneously and then solidified in crystal roller surface, and Thin Strip Steel is finally formed at crystallization roll minimum gap through overheat
Roll and batched after cooling down.
In casting cycle, one group of roll surface cleaning device for being arranged in the non-pool side of every crystallization roll is carried out clearly to roll surface
Reason.Every group of cleaning plant includes two brush rolls parallel with crystallization roll and its rotation, pressure measxurement, Bit andits control etc. and performs inspection
Survey mechanism.Method for cleaning includes：Brush roll rigidity test flow, the pressure acted on by measuring brush roll on crystallization roll obtain
Obtain bristles bend value.By the pressure for controlling brush roll to act on crystallization roll, the amount of bow i.e. brush roll of bristle is controlled
With respect to the flattening amount of crystallization roll；The density in planting of brush roll is controlled between 12-30%；The ratio of brush roll and crystallization roll velocity of rotation
Value and the product of brush roll density in planting are greater than 1.Roll surface cleaning device can calculate its density in planting according to brush roll wear extent
Situation of change, so as to change the velocity of rotation of brush roll, maintain above-mentioned condition.In brush roll serious wear, its cylindrical plant
, can be close by the way that its Excircle machining is reduced into the plant of its surface into spiral wave shape or spiral saw tooth form after density is more than 35%
Degree, is continuing with.
In thin strap continuous casting casting cycle, one group of roll surface cleaning device for being arranged in the non-pool side of every crystallization roll enters to roll surface
Row cleaning.Every group of cleaning plant includes the machines such as two brush rolls parallel with crystallization roll and its rotation, pressure measxurement, Bit andits control
Structure.Method for cleaning includes：The straight line executing mechanism at each brush roll both ends can be by the brush roll of rotation with certain pressure
It is pressed on crystallization roll roll surface, clears up roll surface.With bristle wear, hairbrush roller diameter changes, then is made by changing brush roll
With the pressure on crystallization roll, bristles bend value is kept to keep constant within the specific limits.
Roll surface cleaning device can individually adjust the pressure that every brush roll both ends are applied on crystallization roll roll surface, also can
The velocity of rotation and rotation direction of every brush roll of enough independent changes.
The pressure that brush roll is applied on crystallization roll roll surface is passed by the pressure being arranged between hydraulic cylinder and bearing block
Sensor measures, and the pressure sum at every brush roll both ends is the pressure that the brush roll is applied to crystallization roll roll surface.
With brush roll bristle wear, hairbrush roller diameter changes, and roll surface cleaning device can be by controlling brush roll
The pressure size acted on crystallization roll changes, and keeps bristles bend amount e to keep constant within the specific limits, bending
Amount scope is 0.5%-2.5%.
The brush roll of described roll surface cleaning device is multiplied by the product of brush roll density in planting with the ratio of crystallization roll velocity of rotation
It is greater than 1.The control system of roll surface cleaning device can calculate the situation of change of its density in planting, phase according to brush roll wear extent
Ground is answered to change the velocity of rotation of brush roll.
In brush roll serious wear, after its cylindrical density in planting is more than 30%, can by by its Excircle machining into spiral shell
Rotation waveform or spiral saw tooth form reduce its surface density in planting, reach in the range of 12-30%, are able to reuse that.
Main advantages of the present invention：
1st, in casting cycle, roll surface cleaning device can be adjusted according to the abrasion condition of brush roll and acts on crystallization roll roll surface
On pressure, ensure that the front and rear heat of being cast at one of cleaning effect is a variety of consistent.
2nd, matching is coordinated in pressure position control, improves the Technological adaptability of equipment, can tackle various working condition, improves
The service life of brush roll.
Difference and improvements of the present invention with prior art：
In scheme described in WO2009003223, by monitoring crystal roller surface cleannes in real time, change roll surface cleaning
Device brush roll reaches change crystallization roll relative to the pressure of crystallization roll, velocity of rotation and drive motor moment of torsion even load
The purpose of surface cleanness.Wherein, upper and lower brush roll is arranged symmetrically in the outside of crystallization roll, and it is relative to the pressure between crystallization roll
Power and the stroke realization for being displaced through change hydraulic cylinder, the rotating speed and moment of torsion of brush roll are then adjusted by brush roll drive motor
Section.Wherein, upper and lower brush roll has different purposes and usage, and upper brush roll is used in normal casting, and lower brush roll is put
To put in the lower section of upper brush roll, diameter is less than upper brush roll, and only in casting beginning and end interior use for the previous period.With this
Patent is compared, and upper and lower brush roll both ends are equipped with pressure detecting and position control in the present invention, and control accuracy is higher.Moreover, this
Roll surface cleaning device in invention adjusts it according to the brush roll diameter change detected in real time and acted on crystallization roll roll surface
Pressure, reaction are sensitiveer.And the density in planting change of monitoring brush roll is taken into account, and equipment situation can be understood in time, can be more preferable
Performance brush roll effect.
Described in Korean Patent KR20140000796, the brush roll along the axially in parallel arrangement of crystallization roll is divided into three parts,
Respectively two ends and middle part, wherein each tip lengths account for the 1/14-1/12 of whole roller length, bristle diameter is
0.08-0.12mm；The bristle diameter of remainder is 0.15-0.175mm.The patent claims in this way can be effectively clear
Crystallization roll roll surface is managed, the quality of Cast Strip edge is improved, avoids edge from wrinkle occur.This method can actually have certain effect,
But manufacture is difficult.And the present invention influences cleaning effect based on the density in planting change after brush roll abrasion and set out, and formulates
Corresponding control method, more efficiently it can carry out roll surface prune job using brush roll.
Brief description of the drawings
Fig. 1 is the side schematic view of roll surface cleaning device of the present invention.
Fig. 2 is the schematic top plan view of roll surface cleaning device of the present invention.
Fig. 3 is the typical control principle drawing of roll surface cleaning device of the present invention.
Fig. 4 is brush roll renovation method schematic diagram of the present invention.
Fig. 5 is Fig. 4 A-A sectional views.
Embodiment
Referring to Fig. 1~Fig. 5, thin band continuous casting crystallization roller roll surface cleaning device of the invention, crystallization roll 1a, 1b cloth is corresponded to respectively
Put, by taking two brush rolls 5 ', 6 ' of crystallization roll 1a sides as an example, 4a, 4b are side seal board.
Two brush rolls 5 ', 6 ', parallel crystallization roll 1a arrangement respectively, and positioned in the upper of every non-pool side of crystallization roll 1a
Lower setting；Brush roll 5 ', 6 ' is cylindrical, and its periphery is implanted with elongated metal wire as bristle；The both ends of brush roll 5 ', 6 ' are set
There is bearing block 16,16 ', 17,17 '；Bearing block rear portion is respectively arranged with pressure sensor 10,10 ', 15,15 '；Two motors 14,
14 ', couple two brush rolls 5 ', 6 ' respectively；Two hydraulic cylinders 11,11 ', act on 16 by pressure sensor 10,10 ',
On 16 ' bearing blocks, brush roll 5 ' is driven to be adjacent to or leave crystallization roll 1a；
The method for cleaning of thin band continuous casting crystallization roller roll surface of the present invention, two brush rolls of roll surface cleaning device are respectively in hydraulic pressure
Under cylinder and motor driven, rotate and held out against close to crystallization roll, and with certain pressure in crystallization roll roll surface；With prune job
Lasting to carry out, controller infers that its density in planting changes according to the cylindrical change of brush roll, correspondingly, by controlling servo valve to drive
Hydraulic cylinder drives brush roll to advance, and hydraulic cylinder displacement is predicted by displacement transducer, to keep the bristles bend amount e of brush roll to keep
0.5%~2.5%；Amount of bow e setting formula is as follows：
Wherein：e：Bristles bend amount, %；
r0：Brush roll initial diameter, mm；
r1：Brush roll working diameter, mm.
Further, in brush roll rotation process, the ratio of itself and crystallization roll velocity of rotation is multiplied by the product of brush roll density in planting
It is greater than 1, i.e.,：
Wherein：V1：Brush roll linear velocity, m/min；
V2：Crystallization roll linear velocity, m/min；
λ：Brush roll density in planting, %.
Further, in brush roll serious wear, after its cylindrical density in planting is more than 35%, by by its outer ring
Looks, be processed into spiral wave shape or spiral saw tooth form reduce its surface density in planting after be continuing with.
Also, the control system of roll surface cleaning device calculates the situation of change of its density in planting, phase according to brush roll wear extent
Ground is answered to change the velocity of rotation of brush roll；Wherein, the cylindrical bristle density in planting of brush roll is arranged between 12~30%, and bristle is planted
All bristle sectional area proportions in density i.e. 1 square decimeter.Brush roll exradius and density in planting follow following formula：
Wherein：d0：For brush roll original outer diameter, mm；
dn：External diameter after being worn for brush roll, mm；
ρ0：The a diameter of d of brush roll0When density in planting, %；
ρn：The a diameter of d of brush rollnWhen density in planting, %.
Embodiment
The control strategy of roll surface method for cleaning is introduced by taking the side arrangement of crystallization roll 1a two brush rolls as an example below.
Hydraulic cylinder 11,13 control loops set servo valve 61,62 respectively；Displacement sensing is set respectively on hydraulic cylinder 11,13
Device 12,18 and pressure sensor 10,15, it is electrically connected with controller 60.The cylindrical bristle density in planting of brush roll is arranged on 12
Between~30%, all bristle sectional area proportions in bristle density in planting i.e. 1 square decimeter.
As shown in figure 3, in casting operation, crystallization roll 1a, 1b are rotated in opposite directions, two brush rolls 5 ' of roll surface cleaning device,
6 ' respectively under hydraulic cylinder and motor driven, rotates and is simultaneously held out against close to crystallization roll 1a, and with certain pressure thereon.With clear
The lasting progress of operation is managed, roll surface cleaning device controller 60 infers that its density in planting becomes according to the cylindrical change of brush roll 5 ', 6 '
Change, correspondingly, by controlling servo valve 61 to drive hydraulic cylinder 11 to drive brush roll 5 ' to reduce the distance between crystallization roll 1a, liquid
Cylinder pressure displacement is predicted by displacement transducer 12, and pressure is predicted by pressure sensor 10, the two variable quantity by controller 60
Some model specifications, to keep the bristles bend amount of brush roll 5 ' to be maintained at such as formula 1) as described in scope in.Similarly, servo valve
62 can also receive the drive signal from controller 60, and driving hydraulic cylinder 13 drives brush roll 6 ' to carry out similar operation.
Also, in the rotation process of brush roll 5 ', 6 ', the ratio of itself and crystallization roll velocity of rotation is multiplied by brush roll density in planting
Product is greater than 1, that is, meets described formula 2).
Referring to Fig. 4, Fig. 5, in the serious wear of brush roll 5 ', after its cylindrical density in planting is more than 35%, can pass through by
Its Excircle machining reduces its surface density in planting into spiral wave shape or spiral saw tooth form, reaches in the range of 12-30%.
Claims (3)
1. a kind of method for clearing up twin-roll thin strip continuous casting roll surface, it is characterized in that, two brush rolls of roll surface cleaning device exist respectively
Under hydraulic cylinder and motor driven, rotate and held out against close to crystallization roll, and with certain pressure in crystallization roll roll surface；As cleaning is made
The lasting progress of industry, controller infers that its density in planting changes according to the cylindrical change of brush roll, correspondingly, by controlling servo valve
Hydraulic cylinder is driven to drive brush roll to advance, hydraulic cylinder displacement is predicted by displacement transducer, to keep the bristles bend amount e of brush roll
It is maintained at 0.5%~2.5%；Amount of bow e setting formula is as follows：
<mrow>
<mi>e</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>r</mi>
<mn>0</mn>
</msub>
<mo>-</mo>
<msub>
<mi>r</mi>
<mn>1</mn>
</msub>
</mrow>
<msub>
<mi>r</mi>
<mn>0</mn>
</msub>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
Wherein：e：Bristles bend amount, %；
r0：Brush roll initial diameter, mm；
r1：Brush roll working diameter, mm；
For brush roll during rotating and clearing up roll surface, the product that the ratio of itself and crystallization roll velocity of rotation is multiplied by brush roll density in planting will
More than 1, i.e.,：
<mrow>
<mfrac>
<msub>
<mi>V</mi>
<mn>1</mn>
</msub>
<msub>
<mi>V</mi>
<mn>2</mn>
</msub>
</mfrac>
<mo>&times;</mo>
<mi>&lambda;</mi>
<mo>></mo>
<mn>1</mn>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
Wherein：V1：Brush roll linear velocity, m/min；
V2：Crystallization roll linear velocity, m/min；
λ：Brush roll density in planting, i.e., all bristle sectional area proportions in 1 square decimeter, %.
2. the method for cleaning twin-roll thin strip continuous casting roll surface as claimed in claim 1, it is characterized in that, in brush roll serious wear,
After its cylindrical density in planting is more than 35%, reduced by by its cylindrical pattern, being processed into spiral wave shape or spiral saw tooth form
It is continuing with after its surface density in planting.
3. the method for cleaning twin-roll thin strip continuous casting roll surface as claimed in claim 1, it is characterized in that, the control of roll surface cleaning device
System calculates the situation of change of its density in planting according to brush roll wear extent, correspondingly changes the velocity of rotation of brush roll；Wherein,
The cylindrical bristle density in planting of brush roll is arranged between 12~30%, and bristle density in planting is all bristle sections in 1 square decimeter
Product proportion；Exradius and density in planting follow following formula：
<mrow>
<msub>
<mi>&rho;</mi>
<mi>n</mi>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>d</mi>
<mn>0</mn>
</msub>
<msub>
<mi>d</mi>
<mi>n</mi>
</msub>
</mfrac>
<msub>
<mi>&rho;</mi>
<mn>0</mn>
</msub>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
Wherein：d0：For brush roll original outer diameter, mm；
dn：External diameter after being worn for brush roll, mm；
ρ0：The a diameter of d of brush roll0When density in planting, %；
ρn：The a diameter of d of brush rollnWhen density in planting, %.
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| CN201510642921.2A CN105149562B (en) | 2015-09-30 | 2015-09-30 | A kind of method for clearing up twin-roll thin strip continuous casting roll surface |
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| CN105149562A CN105149562A (en) | 2015-12-16 |
| CN105149562B true CN105149562B (en) | 2018-01-30 |
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| CN110087799B (en) * | 2016-12-26 | 2021-03-23 | 宝山钢铁股份有限公司 | Cast roll surface cleaning device and method |
| CN109290536B (en) * | 2018-09-18 | 2020-12-22 | 洛阳中赫非晶科技有限公司 | Amorphous strip production system |
| CN111730035A (en) * | 2020-07-03 | 2020-10-02 | 贵溪奥泰铜业有限公司 | Brass bar processing continuous casting device |
| CN112157230A (en) * | 2020-09-07 | 2021-01-01 | 东北大学 | Double-roller thin-strip continuous casting roller surface cleaning device |
| CN112157229A (en) * | 2020-09-07 | 2021-01-01 | 东北大学 | Roll surface cleaning device for thin strip continuous casting and control method and control device thereof |
| CN115625202A (en) * | 2022-09-27 | 2023-01-20 | 张家港中美超薄带科技有限公司 | Method for improving local high points of hot-rolled thin strip steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6886623B2 (en) * | 1998-06-17 | 2005-05-03 | Castrip Llc | Strip casting apparatus |
| CN101376164B (en) * | 2007-08-27 | 2011-04-13 | 宝山钢铁股份有限公司 | Control method of roll forming of twin-roll thin strip continuous casting cooling roll |
| CN102950276B (en) * | 2011-08-30 | 2014-10-01 | 宝山钢铁股份有限公司 | Method and device for cleaning surface of dual-roller thin-strip casting roll |
| CN103182491B (en) * | 2011-12-30 | 2015-08-26 | 宝山钢铁股份有限公司 | A kind of free loops by thin-strip continuous casting control method and device |
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