CN109513746A - A kind of hot-strip method and rough rolling device for small dimension continuous casting billet - Google Patents
A kind of hot-strip method and rough rolling device for small dimension continuous casting billet Download PDFInfo
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- CN109513746A CN109513746A CN201811476963.3A CN201811476963A CN109513746A CN 109513746 A CN109513746 A CN 109513746A CN 201811476963 A CN201811476963 A CN 201811476963A CN 109513746 A CN109513746 A CN 109513746A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 146
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000009749 continuous casting Methods 0.000 title claims abstract description 33
- 230000002441 reversible effect Effects 0.000 claims abstract description 30
- 230000009467 reduction Effects 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000003801 milling Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000004323 axial length Effects 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002923 metal particle Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
-
- 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
-
- 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
- B21B37/58—Roll-force control; Roll-gap control
-
- 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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/12—Arrangement or installation of roller tables in relation to a roll stand
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
- B21B2027/022—Rolls having tapered ends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2271/00—Mill stand parameters
- B21B2271/02—Roll gap, screw-down position, draft position
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Abstract
A kind of hot-strip method and rough rolling device for small dimension continuous casting billet, including roughing operation, roughing operation is carried out in rough rolling device, rough rolling device is equipped with a vertical miller, a two-roller reversible universal mill, one roller of two-roller reversible universal mill is plain-barreled roll, another roller is wedge shape roller, rough rolling process carries out as steps described below: a, roughing a time, and blank turns round 180 degree；B, two passage of roughing, blank turn round 180 degree；C, three passage of roughing, blank turn round 180 degree；D, roughing four-pass；E, five passage of roughing；First four passage completes total reduction, total reduction 75-85%, and the 5th passage is the rolling of edger roll limit for width.The present invention has adjusted roughing roll shape, improves rough rolling device, makes strip percentage spread up to 25% or more, is enhanced about more than once compared with prior art, to widen device product width specifications, be conducive to and reduce production cost, improves production efficiency.
Description
Technical field
The present invention relates to a kind of rolling mill practices, especially for the hot-strip method of small dimension continuous casting billet and roughing dress
It sets.
Background technique
The production technology of conventional small dimension continuous casting billet hot rolling strip are as follows: converter smelting-conticaster continuous casting-continuous casting billet adds
Heat-roughing-finish rolling-cooling.Above-mentioned technical process is in roughing on middle width strip separate unit two-roller reversible universal mill, usually using flat
The unrestricted spread amount of rolling system, rolled piece is small, often in 20~50mm.To cover the rule of all product widths under equipment maximum capacity
Lattice, need frequently to adjust the size of continuous cast mold, stop pouring, open the unqualified slab cut off during pouring in this way, increasing
Quantity, increases production cost and production efficiency is low.It to widen product specification, while investing less, is quick, needing to roll to existing
Technique processed improves.
A kind of method for thering is document report to improve roughing Forced Spread: patent " Total continuity hot rolling of 104826874 B of CN
The Forced Spread control method of middle rough rolling process " provides a kind of Forced Spread control method of rough rolling process, and this method passes through
Multi rack milling train collective effect, the hole type design that wherein forebay is symmetrical and inner surface is raised increase absolute spread and form bone type,
Pass through last rack again for its smooth rectangular base.This method needs more roughing mill continuous rollings, is not suitable for singlestandmill.
The method for widening that a kind of patent " milling method of cut deal " of 106475412 A of CN provides is to turn 90 degrees slab, wide along plate
Direction is rolled to target width, then returns to turn 90 degrees and carry out extension rolling.This method requires slab length to be less than roll width, is unsuitable for
Continuous casting billet of the length in 5m or more.
Summary of the invention
The present invention for provided the drawbacks of solving the prior art it is a kind of can significantly improve Lateral Spread of Rolled Stock for small dimension
The hot-strip method of continuous casting billet.The present invention also provides the rough rolling devices that implementation the method uses.
In order to achieve the above objectives, the technical solution adopted by the present invention is that it is such:
A kind of hot-strip method for small dimension continuous casting billet, including heating, de-scaling, roughing, finish rolling, section cooling,
Crimp packing process, it is characterised in that: the roughing operation carries out on rough rolling device, and rough rolling device is equipped with an edger roll and rolls
Machine, a two-roller reversible universal mill, a roller of two-roller reversible universal mill is plain-barreled roll, another roller is wedge shape roller, roughing
Process carries out as steps described below
A, roughing a time, drafts are △ h1, rolled piece section is wedge shape, and blank turns round 180 degree；
B, two passage of roughing, drafts are △ h2, rolled piece section is wedge shape, and blank turns round 180 degree；
C, three passage of roughing, drafts are △ h3, rolled piece section is wedge shape, and blank turns round 180 degree；
D, roughing four-pass, drafts zero, rolled piece section are double-wedge；
E, five passage of roughing rolls for edger roll limit for width；
It is zero that wherein first four passage edger roll, which surveys pressure, total reduction 75-85%, and the 5th passage is the rolling of edger roll limit for width,
△h1、△h2、△h3By being calculated.
The above-mentioned hot-strip method for small dimension continuous casting billet, the method are suitable for diameter 900-1100mm, width
The roll of 650-850mm adds the continuous casting billet roughing of width 380mm~510mm, 160~220mm of thickness, 5.0~10m of length
Work, the roll shape of the wedge shape roller are as follows: y=tan ɑ * x, wherein ɑ is upper roller inclination angle, and x is pass axial length variable；Y is that pass is high
Spend the function changed with pass length axis variable x；The value range of ɑ is 0.0003 ° -4.22 °.
The above-mentioned hot-strip method for small dimension continuous casting billet, the soaking temperature in heating process are 1280-1300 DEG C,
Heating time 70~120 minutes, 1150~1200 DEG C of roughing start rolling temperature, mill speed 2.0m/s.
The above-mentioned hot-strip method for small dimension continuous casting billet, finishing rolling step be seven milling train continuous rollings of finish rolling, preceding 6
Rolling mill is plain-barreled roll, the 7th rolling mill using CVC roll shape, and 900-950 DEG C of finish rolling start rolling temperature, rolls by 800-850 DEG C of finishing temperature
5~6m/s of speed processed, single pass reduction ratio >=10%.
The above-mentioned hot-strip method for small dimension continuous casting billet, section cooling process are 620 ± 15 DEG C of final cooling temperature, cold
But 10 DEG C/s of speed.
A kind of rough rolling device of the hot-strip for small dimension continuous casting billet, including a vertical miller setting gradually and
One two-roller reversible universal mill is respectively equipped with roughing in the inlet side of vertical miller and the outlet side of two-roller reversible universal mill
Roller-way is turned round, the roughing revolution roller-way is equipped with rotary round table, and rotary round table is equipped with roller-way ontology, rotary round table connection master
Axis, live spindle connect driving mechanism.
The rough rolling device of the above-mentioned hot-strip for small dimension continuous casting billet, sets between the rotary round table and roller-way ontology
There are several support columns, rolling support sphere is equipped between rotary round table lower part and basal plane.
The rough rolling device of the above-mentioned hot-strip for small dimension continuous casting billet, the lower roll of two-roller reversible universal mill is flat
Roller, upper roller are wedge shape roller.
The rough rolling device of the above-mentioned hot-strip for small dimension continuous casting billet, driving mechanism are equipped with driving motor, driving electricity
Machine connects main shaft through gear drive, and driving motor is arranged two.
The present invention, which is directed to, solves the problems, such as that rough rolling strip steel improves absolute spread to rolling mill practice on the omnipotent reversible roughing mill of separate unit
Improved with rough rolling device, main feature is embodied in following aspect: 1, having adjusted roughing roll shape, use a roll for
The roll design of wedge shape roller forces metal particle to laterally move, and pushes middle section metal to flow to the big side of thickness, makes
Absolute spread increases；2, rough rolling device is improved, roller-way is turned round using roughing, is rolled back and forth using the revolution of roughing revolution roller-way
System keeps deformation at left and right sides of steel plate uniform, the thin band convexity section in formation thick middle, both sides；3, heating technique parameter is had adjusted,
Soaking temperature and roughing temperature are improved, guarantees deformation temperature with higher in steel plate rough rolling process, reduces resistance of deformation,
Heavy reduction deformation can be carried out smoothly；4, finish rolling low temperature controls, and increases the change that rolled piece is in the rolling of austenite Unhydrated cement
Shape amount generates the left and right of refinement crystal grain, improves steel band strength and toughness.Using strip percentage spread of the present invention up to 25%, compare
The prior art is enhanced about more than once, to widen device product width specifications, be conducive to and reduce production cost, improves production effect
Rate.
Detailed description of the invention
Fig. 1 is the schematic diagram of rough rolling device of the present invention；
Fig. 2 is the schematic diagram of roughing revolution roller-way；
Fig. 3 is the schematic diagram of two-roller reversible universal mill upper roller, lower roll；
Fig. 4-Fig. 8 is schematic cross-section of the roughing operation strip respectively after each passes；
Fig. 9 is the flow chart of the method for the present invention；
Figure 10 is rolled piece double-wedge section shape schematic diagram.
Each list of reference numerals in figure are as follows: 1, vertical miller, 2, two-roller reversible universal mill, 2-1, upper roller, 2-2, lower roll, 3, thick
Roll revolution roller-way, 3-1, roller-way ontology, 3-2, support column, 3-3, main shaft, 3-4, rotary round table, 3-5, gear drive, 3-6, electricity
Machine, 3-7, supporting sephere, 4, heating, 5, finish rolling, 6, section cooling, 7, curling packing.
Specific embodiment
Referring to Fig. 9, the technical process of the method for the present invention includes heating 4, de-scaling, roughing, finish rolling 5, section cooling 6, curling
The processes such as 7 are packaged, mainly improves and is embodied in roughing operation.Roughing operation is at the vertical miller set gradually 1, one two
Implement on the reversible universal mill 2 of roller.The soaking temperature of heating process is 1280-1300 DEG C, heating time 70~120 minutes；Slightly
Steel plate after rolling enters seven milling train continuous rollings of finish rolling after cutting off, and 6 rolling mills are plain-barreled roll, the use of the 7th rolling mill before finish rolling
CVC roll shape.900-950 DEG C of finish rolling start rolling temperature, 800-850 DEG C of finishing temperature.5~6m/s of mill speed, single pass reduction ratio
>=10%；Steel band progress section cooling after finish rolling, 620 ± 15 DEG C of final cooling temperature, 10 DEG C/s of cooling velocity.
Roughing operation of the present invention, suitable for diameter 900-1100mm, width 650-850mm roll to width
The continuous casting billet roughing processing of 380mm~510mm, 160~220mm of thickness, 5.0~10m of length.Under different rolling conditions,
The form of spreading of rolled piece during the rolling process is divided into unrestricted spread, restricted spread and induced spread, wherein induced spread is to pass through
The roll of convex peak pass makes the metal volume of pressure be forced metal particle to laterally move by cutting spread, is conducive to metal particle
Lateral flow, makes rolled piece width generate additional growth, and absolute spread is greater than the unrestricted spread amount of flat rolling.The present invention uses wedge
The roll design of shape roll gap forces metal particle to laterally move, and by turning around to roll, plays the work for flattening wedge-shaped high point
With.
Referring to Fig. 3, the lower roll 2-2 of two-roller reversible universal mill of the present invention is plain-barreled roll, upper roller 2-1 is wedge shape roller (wedge
The upper and lower position of shape roller cannot change, and otherwise rolled piece folding wedge face is not easy to transport on roller-way under), upper roller is with leftmost side end
Face is origin, roll shape are as follows: y=tan ɑ * x, wherein ɑ is upper roller inclination angle, and x is pass axial length variable, the value range root of x
It is adjusted according to roll width between 650-850mm；Y is that pass height is the function changed with pass length axis variable x.Roughing uses
Five passes, the first passage of rough rolling process, the second passage, third passage drafts be respectively △ h1、△h2、△h3, the 4th
The roll gap of passage is constant, △ h4It is 0；The rolling of 5th passage edger roll limit for width, according to rolling experience, is opened due to expanding with heat and contract with cold
Degree is set as finished width+5mm.Roughing a time, rolled piece section are wedge shape, as shown in Figure 4；Blank turns round 180 degree, roughing two
Passage, rolled piece section are wedge shape, as shown in Figure 5；Blank turns round 180 degree, and three passage of roughing, rolled piece section is wedge shape, such as Fig. 6 institute
Show；Blank turns round 180 degree, roughing four-pass, and rolled piece section is double-wedge, as shown in Figure 7；Five passage of roughing, rolled piece section are
Double-wedge, as shown in Figure 8.Wherein first four passage is force spreading rolling, and edger roll side pressure is zero, completes total reduction, stagnation pressure
Lower rate is 75-85%, and the 5th passage is the rolling of edger roll limit for width.1150~1200 DEG C of roughing start rolling temperature, mill speed 2.0m/s.
(explanation: rolled piece double-wedge section shape refers to section bottom edge level, and bottom edge both ends vertically extend the identical two sides of height upwards,
The top opposite with bottom edge is the bevel edge of two equal lengths)
The determination process of roughing upper roller inclination angle ɑ value range is given below.
With reference to Figure 10, there are following relationships by the upper roller inclination angle ɑ and absolute spread △ b of the method for the present invention, using homalographic, averagely
Height method calculates average thicknessRoll rear average thickness and average draftsAre as follows:
Area SRectangle=SDouble-wedge, (1)
SDouble-wedge=2* [1/2* (hBottom+h)*b/2], (3)
And wedge-shaped bottom thickness hBottom=h-0.5*b*tan ɑ, (4)
Bringing formula (2), (3), (4) into formula (1) can derive:
Average height
Average drafts
Formula is grown by the JI. heat of rolling process (second edition) Chinese style (1-37), it is known that spread the relationship with drafts are as follows:
That is b-B=C* [H- (h-b*tan ɑ * 0.25)],
B=[C* (H-h)+B]/[1-C*tan ɑ * 0.25], (5) can be obtained
Percentage spread We=△ b/B
=[C* (H-h) * (1/B)+C*tan ɑ * 0.25]/[1-C*tan ɑ * 0.25]
=[C* (H-h) * (1/B)+1]/- 1 (6) [1-C*tan ɑ * 0.25]
In formula, H is rolled piece middle thickness before rolling,
H is to roll rear rolled piece middle thickness,
B is rolled piece width before rolling,
B is to roll rear rolled piece width,
ɑ is roll inclination angle,
To spread index, (C=0~1 counts under rolling condition of the invention according to rolling data C, and C is
0.50-0.65)。
The percentage spread known to formula (5) increases with drafts H-h and is increased, increases with width and reduce, with roll inclination angle ɑ
Increase and increases.But in drafts, one timing of width, inclination angle is bigger, and the drafts difference at wedge-shaped both ends is bigger, and small head end enters
The drafts of milling train is in addition to the volume under pressure of roll, and there are also the wedge of wedge shape itself after rotation 180 degree is high.According to rolling principle, work as pressure
When lower amount is more than the maximum reduction that milling train allows, it may appear that rolled piece skids, the phenomenon that can not rolling.It is worked out with reference to Lv Lihua
Operation of rolling bite condition (formula 6.8) and deformed area parameter in flow of metal basic material " metal plastic deformation and rolling principle "
(formula 6.1) has:
Bite condition (formula 6.8): β >=θ, (7)
Deformed area parameter relationship formula (formula 6.1): △ H=D (1-cos θ), (8)
Single pass maximum reduction △ h can be obtained by formula (7), (8)max=D (1-cos β) (9)
In formula, β is maximum depression angle, passes through the nip angle of the various milling trains of access " rolling principle handbook " table 3-1, β 18-
22 °, can be 22 ° when low speed bites,
Drafts when θ is rolled piece entrance angle, △ H be entrance angle is θ,
D is roll average diameter,
As ɑ=0, the operation of rolling is flat rolling, according to formula (9), when three passes, and single pass maximum reduction △
hmaxWith overall reduction △ HAlwaysRelationship are as follows:
△HAlways≤3*△hmax,
That is △ HAlways=η * H≤3*D* (1-cos β),
Then there is minimum average B configuration diameter D0=η * H/ [3* (1-cos β)] (10)
In formula, η is roughing total reduction,
H is rolled piece thickness before roughing,
△HAlwaysFor three passage overall reduction of roughing.
As ɑ ≠ 0, since upper roller is wedge shape, roll gap is minimum at roll left side, has a maximum drafts, and first
When secondary rolling, drafts should be the wedge-shaped difference in height △ h of intermediate drafts+upper roller edge and intermediate position at left sideWedge 1；It returns
When turning 180 ° of second passages of rolling, the high-end wedge bottom end in roll of the wedge of rolled piece is rolled, and drafts removes the pressure of roll at left side
Outside lower amount, there are also roll wedge shape difference in height △ hWedge 2；Similarly, when then turning round 180 ° of rolling third passages, drafts is at left side
The drafts and roll wedge shape difference in height △ h of rollWedge 3The sum of.Compared with when ɑ=0, increased drafts △ at roll left side
hWedgeAre as follows:
△hWedge=△ hWedge 1+△hWedge 2+△hWedge 3 (11)
△hWedge 1=1/2*L*tan ɑ, (12)
△hWedge 2=L*tan ɑ, (13)
△hWedge 3=L*tan ɑ, (14)
At this point, the maximum reduction △ h of roll middlemax1、△hmax2、△hmax3It is respectively as follows:
△hmax1=Dx(1-cosβ)-△hWedge 1=Dx(1-cos β) -1/2*L*tan ɑ, (15)
△hmax2=Dx(1-cosβ)-△hWedge 2=Dx(1-cos β)-L*tan ɑ, (16)
△hmax3=Dx(1-cosβ)-△hWedge 3=Dx(1-cos β)-L*tan ɑ, (17)
In formula, L is roll width, DxFor wedge shape roller average diameter.
To guarantee that each slab width within the scope of the rolling width of wedge shape roller, meets biting for rolling at roll left side
Condition, according to formula (9), increased drafts △ hWedgeWith DxIt should meet:
△hWedge≤3*(Dx-D0)*(1-cosβ) (18)
Formula (11), (12), (13), (14) substitution formula (18) can be obtained into roll inclination maximum ɑmaxWith diameter DxRelationship are as follows:
tanɑmax=3* (Dx-D0) * (1-cos β)/(2.5L), (19)
Then ɑmax=arctan [3* (Dx-D0)*(1-cosβ)/2.5L]
=arctan { [3*Dx* (1-cos β)-η * H]/2.5L }, (20)
By formula (20) it is found that DxWhen=1100mm, L=650mm, H=160mm, η=75%, β=22 °, upper roller inclination angle
ɑmaxMaximum is 4.22 °；DxWhen=900mm, L=850mm, H=220mm, η=85%, β=21.45 °, ɑmaxMinimum is
0.0003°。
Formula (20) substitution formula (6) can be obtained:
We=[C* (H-h) * (1/B)+1]/[1-C*tan ɑ * 0.25] -1
=[3*C*Dx*(1-cosβ)-10*L*/B+1]/[C*η*H/(10L)+1-3*C*Dx*(1-cosβ)/10]+10*
L*/B-1, (21)
According to formula (21), work as DxWhen=1100mm, L=650mm, H=220mm, η=85%, B=380mm, β=22 °,
Percentage spread is maximum；Work as DxWhen=900mm, L=850mm, H=160mm, η=75%, when B=510mm, β=18 °, percentage spread is most
It is small.
For the needs for meeting rough rolling process drafts, the roughing △ h of this patent1、△h2、△h3Reduction in pass is respectively as follows:
△h1=△ hmax1=Dx(1-cos β) -1/2*L*tan ɑ,
△h2=△ hmax2=Dx(1-cos β)-L*tan ɑ,
△h3=△ hAlways-△h1-△h2=Dx(1-cosβ)-1/2*L*tanɑ。
It turns around the needs of rolling to meet rough rolling process, the roughing dress that the present invention provides a kind of for realizing the method
It sets.Referring to Fig. 1, Fig. 2, the rough rolling device, including the vertical miller 1 and two-roller reversible universal mill 2 set gradually, in edger roll
The inlet side of milling train and the outlet side of two-roller reversible universal mill are respectively equipped with roughing revolution roller-way 3.Roller-way is turned round in roughing can be with
Realize that 180 ° to blank are turned around to roll by rotation.Roughing turns round roller-way and is equipped with rotary round table 3-4, and rotary round table is equipped with roller
Road ontology 3-1, rotary round table connect main shaft 3-3, and live spindle connects driving mechanism.Driving mechanism is equipped with two driving motor 3-
6, each driving motor is rotated synchronously through gear drive 3-5 connection main shaft, two driving motors, drives connection main shaft through gear drive
Gear wheel drive rotary round table rotation.Several branch to depressing table ontology are distributed between rotary round table and roller-way ontology
Dagger 3-2, is equipped with array rolling support sphere 3-7 between rotary round table lower part and basal plane, rotation can be improved in setting support bulb
Turn the kinetic stability of rotary table, and reducing friction resistance.
Referring to Fig. 3, the lower roll 2-2 of two-roller reversible universal mill is plain-barreled roll, upper roller 2-1 is wedge shape roller, according to calculated above
It is found that the inclination angle of wedge shape roller is 0.0003 ° -4.22 °.
Specific embodiments of the present invention are given below:
Embodiment 1:
Choose rolling steel grade Q235B, continuous casting material width 510mm, thickness 160mm, finished strip thickness 6.0mm, width
585mm, target width hot value 590mm, topping roll middle diameter 900mm, lower roller diameter 900mm, roll barrel length
850mm。
In the present embodiment, 1290 DEG C of heating furnace soaking section temperature, time inside furnace 120min；Roughing reduction ratio η takes 75%, rolls
Workpiece thickness 40mm afterwards,.
Upper roller inclination angle ɑ=arctan { [3*DX* (1-cos β)-η * H]/2.5L }=arctan { [3*900mm* (1-
Cos18 °) -0.75*160mm]/2.5*850mm }=0.32 °, curve y=0.0057x.
It calculates each reduction in pass of roughing and is respectively as follows: △ h1=DX(1-cos β) -0.5*L*tan ɑ=900mm* (1-
Cos18 °) -0.5*850mm*0.0057=42mm；△h2=DX(1-cos β)-L*tan ɑ=39mm；△h3=η * H- △ h1-△
h2=75%*160mm-42mm-39mm=39mm.
With the roll gap of up-down rollers middle, 5 passage reduction parameters are set and are as follows:
| Passage | One | Two | Three | Four | Five |
| Roll gap setting | 118mm | 79mm | 40mm | 40mm | 200mm |
| Edger roll roll gap | 850mm | 850mm | 850mm | 850mm | 590mm |
The operation of rolling: roughing mill rolls the first passage, and 1200 DEG C of start rolling temperature, rolled piece section becomes wedge shape from rectangle, rolls
Part section measures width B1△ B is spreaded for 535mm, intermediate part thickness 118.14mm1=25mm is as shown in Figure 4；
The roughing revolution roller-way of two-roller reversible universal mill outlet side turns round 180 degree, and steel plate carries out roughing mill rolling second
Passage, 1160 DEG C of rolling temperature, rolled piece measures width B2△ B is spreaded for 562mm, intermediate part thickness 79.45mm2=27mm,
The cross sectional shape of rolled piece is wedge shape, as shown in Figure 5
Vertical miller inlet side roughing turns round roller-way and turns round 180 degree, and steel plate carries out roughing mill and rolls third passage, rolling temperature
1100 DEG C of degree, rolled piece measures width B3△ B is spreaded for 584mm, intermediate part thickness 41.83mm3=22mm, the section shape of rolled piece
Shape is wedge shape, as shown in Figure 6
The roughing revolution roller-way of two-roller reversible universal mill outlet side turns round 180 degree, and steel plate carries out roughing mill rolling the 4th
Passage, measures width B by 1050 DEG C of rolling temperature4△ B is spreaded for 592mm, intermediate part thickness 40.81mm4=8mm, rolled piece
Cross sectional shape is double-wedge, as shown in fig. 7,
Vertical miller inlet side roughing turns round roller-way and turns round 180 degree, and two-roller reversible universal mill lifts roll gap, edger roll opening
It spends 590mm and rolls the 5th passage, 1020 DEG C of rolling temperature, roll rear steel plate width 590mm, with a thickness of 40.81mm, the section of rolled piece
Shape is double-wedge, as shown in Figure 8.
After roughing steel plate be sent to finish rolling carry out 7 tandem rollings, 900-950 DEG C of start rolling temperature, 800-850 DEG C of finishing temperature, laminar flow
10 DEG C/S of cooling velocity, 620 ± 15 DEG C of coiling temperature.It is 585.3mm that strip width is measured after rolling, and absolute spread reaches
75.3mm, percentage spread 14.76%.
Comparative example 1:
It is the comparative example of flat rolling that one presented below, which uses two-roller reversible universal mill upper and lower roll:
Continuous casting billet Q235B, width 510mm, thickness 160mm, finished strip thickness 6.0mm.Using two plain-barreled roll unrestricted spreads
Rolling, upper and lower roller diameter is 900mm, workpiece thickness 40mm after roughing.The operation of rolling the following steps are included:
1290 DEG C of heating furnace soaking section temperature, time inside furnace 120min；Workpiece thickness 40mm after roughing, reduction ratio η take
75%.
Roughing is rolled back and forth using 3 passages, 1200 DEG C of start rolling temperature, each reduction in pass be respectively 50mm, 35mm,
35mm is as follows:
| Passage | One | Two | Three |
| Roll gap setting | 118mm | 79mm | 40mm |
| Edger roll roll gap | 650mm | 650mm | 650mm |
It is respectively B that each passage exit width is measured in the operation of rolling1=525mm, B2=539mm, B3=551mm.
After roughing steel plate be sent to finish rolling carry out 7 tandem rollings, 900-950 DEG C of start rolling temperature, 800-850 DEG C of finishing temperature, laminar flow
10 DEG C of cooling velocity, 620 ± 15 DEG C of coiling temperature；It is 546.6mm that strip width is measured after rolling, and absolute spread 36.6mm is spreaded
Rate 7.18%.
Embodiment 2:
Choose rolling steel grade Q235B, continuous casting material width 380mm, thickness 220mm, finished strip thickness 6.0mm, width
475mm, target width hot value 480mm, topping roll middle diameter 1100mm, lower roller diameter 1100mm, roll barrel length
650mm。
In the present embodiment, 1290 DEG C of heating furnace soaking section temperature, time inside furnace 120min；Workpiece thickness after roughing
33mm, reduction ratio η take 85%.
Upper roller inclination angle ɑ=arctan { [3*DX* (1-cos β)-η * H]/2.5L }=arctan { [3*1100mm* (1-
Cos22 °) -0.85*220mm]/2.5*650mm }=1.87 °, curve y=0.033x.
It calculates each reduction in pass of roughing and is respectively as follows: △ h1=DX(1-cos β) -0.5*L*tan ɑ=1100mm* (1-
Cos22 °) -0.5*650mm*0.033=69mm；△h2=DX(1-cos β)-L*tan ɑ=59mm；△h3=η * H- △ h1-△h2
=85%*220mm-69mm-59mm=59mm.
The pressure of 5 passages is arranged to be as follows:
| Passage | One | Two | Three | Four | Five |
| Roll gap setting | 151mm | 92mm | 33mm | 33mm | 200mm |
| Edger roll roll gap | 650mm | 650mm | 650mm | 650mm | 480mm |
The operation of rolling: roughing mill rolls the first passage, and 1200 DEG C of start rolling temperature, rolled piece section becomes wedge shape from rectangle, rolls
Part section measures width B1△ B is spreaded for 409mm, intermediate part thickness 151.42mm1=29mm is as shown in Figure 4；
The roughing revolution roller-way of two-roller reversible universal mill outlet side turns round 180 degree, and steel plate carries out roughing mill rolling second
Passage, 1160 DEG C of rolling temperature, rolled piece measures width B2△ B is spreaded for 442mm, intermediate part thickness 92.53mm2=33mm,
The cross sectional shape of rolled piece is wedge shape, as shown in Figure 5
Vertical miller inlet side roughing turns round roller-way and turns round 180 degree, and steel plate carries out roughing mill and rolls third passage, rolling temperature
1100 DEG C of degree, rolled piece measures width B3△ B is spreaded for 473mm, intermediate part thickness 34.97mm3=31mm, the section shape of rolled piece
Shape is wedge shape, as shown in Figure 6
The roughing revolution roller-way of two-roller reversible universal mill outlet side turns round 180 degree, and steel plate carries out roughing mill rolling the 4th
Passage, measures width B by 1050 DEG C of rolling temperature4△ B is spreaded for 482mm, intermediate part thickness 33.87mm4=9mm, rolled piece
Cross sectional shape is double-wedge, as shown in fig. 7,
Vertical miller inlet side roughing turns round roller-way and turns round 180 degree, and two-roller reversible universal mill lifts roll gap, edger roll opening
It spends 480mm and rolls the 5th passage, 1020 DEG C of rolling temperature, roll rear steel plate width 480mm, with a thickness of 33.87mm, the section of rolled piece
Shape is double-wedge, as shown in Figure 8.
After roughing steel plate be sent to finish rolling carry out 7 tandem rollings, 900-950 DEG C of start rolling temperature, 800-850 DEG C of finishing temperature, laminar flow
10 DEG C/s of cooling velocity, 620 ± 15 DEG C of coiling temperature.It is 476.6mm that strip width is measured after rolling, and absolute spread reaches
96.6mm, percentage spread 25.42%.
Comparative example 2:
It is the comparative example of flat rolling that one presented below, which uses two-roller reversible universal mill upper and lower roll:
Continuous casting billet Q235B, width 380mm, thickness 220mm, finished strip thickness 6.0mm.Using two plain-barreled roll unrestricted spreads
Rolling, top and bottom rolls diameter is 1100mm, workpiece thickness 33mm after roughing.The operation of rolling the following steps are included:
1290 DEG C of heating furnace soaking section temperature, time inside furnace 120min；Workpiece thickness 30mm after roughing, reduction ratio η take
85%.
Roughing is rolled back and forth using 3 passages, 1200 DEG C of start rolling temperature, each reduction in pass be respectively 69mm, 59mm,
59mm is as follows:
| Passage | One | Two | Three |
| Roll gap setting | 151mm | 92mm | 33mm |
| Edger roll roll gap | 850mm | 850mm | 850mm |
It is respectively B that each passage exit width is measured in the operation of rolling1=396mm, B2=421mm, B3=433mm.
After roughing steel plate be sent to finish rolling carry out 7 tandem rollings, 900-950 DEG C of start rolling temperature, 800-850 DEG C of finishing temperature, laminar flow
10 DEG C/s of cooling velocity, 620 ± 15 DEG C of coiling temperature；It is 428.3mm, absolute spread 48.3mm that strip width is measured after rolling, wide
Exhibition rate 12.71%.
Use wedge shape roller and flat rolling than upper by above-described embodiment and two-roller reversible universal mill it can be seen from comparative example
Lower roll, which samples flat rolling absolute spread, can be improved one times or more.
Claims (9)
1. a kind of hot-strip method for small dimension continuous casting billet, including heating, de-scaling, roughing, finish rolling, section cooling, volume
Bent packing process, it is characterised in that: the roughing operation carries out on rough rolling device, rough rolling device be equipped with a vertical miller,
One two-roller reversible universal mill, a roller of two-roller reversible universal mill is plain-barreled roll, another roller is wedge shape roller, rough rolling process
It carries out as steps described below
A, roughing a time, drafts are △ h1, rolled piece section is wedge shape, and blank turns round 180 degree；
B, two passage of roughing, drafts are △ h2, rolled piece section is wedge shape, and blank turns round 180 degree；
C, three passage of roughing, drafts are △ h3, rolled piece section is wedge shape, and blank turns round 180 degree；
D, roughing four-pass, drafts zero, rolled piece section are double-wedge；
E, five passage of roughing rolls for edger roll limit for width；
It is zero that wherein first four passage edger roll, which surveys pressure, total reduction 75-85%, and the 5th passage is the rolling of edger roll limit for width, △ h1、
△h2、△h3By being calculated.
2. the hot-strip method according to claim 1 for small dimension continuous casting billet, it is characterised in that: the method is suitable
For diameter 900-1100mm, width 650-850mm roll to width 380mm~510mm, 160~220mm of thickness, length
The continuous casting billet roughing of 5.0~10m is processed, the roll shape of the wedge shape roller are as follows: y=tan ɑ * x, wherein ɑ is upper roller inclination angle, and x is pass
Axial length variable；Y is the function that pass height changes with pass length axis variable x；The value range of ɑ be 0.0003 °-
4.22°。
3. the hot-strip method according to claim 2 for small dimension continuous casting billet, it is characterised in that: in heating process
Soaking temperature be 1280-1300 DEG C, heating time 70~120 minutes, 1150~1200 DEG C of roughing start rolling temperature, mill speed
2.0m/s。
4. the hot-strip method according to claim 3 for small dimension continuous casting billet, it is characterised in that: finishing rolling step is
Seven milling train continuous rollings of finish rolling, preceding 6 rolling mill are plain-barreled roll, the 7th rolling mill using CVC roll shape, finish rolling start rolling temperature 900-950
DEG C, 800-850 DEG C of finishing temperature, 5~6m/s of mill speed, single pass reduction ratio >=10%.
5. the hot-strip method according to claim 4 for small dimension continuous casting billet, it is characterised in that: laminar flow cooling
Sequence, 620 ± 15 DEG C of final cooling temperature, 10 DEG C/s of cooling velocity.
6. a kind of rough rolling device of the hot-strip for small dimension continuous casting billet, including the vertical miller set gradually and one
Platform two-roller reversible universal mill, it is characterised in that: in the inlet side of vertical miller and the outlet side point of two-roller reversible universal mill
Not She You roughing revolution roller-way (3), roughing revolution roller-way is equipped with rotary round table (3-4), and rotary round table is equipped with roller-way sheet
Body (3-1), rotary round table connect main shaft (3-3), and live spindle connects driving mechanism.
7. the rough rolling device of the hot-strip according to claim 6 for small dimension continuous casting billet, it is characterised in that: described
It is equipped with several support columns (3-2) between rotary round table and roller-way ontology, rolling is equipped between rotary round table lower part and basal plane
Dynamic supporting sephere (3-7).
8. the rough rolling device of the hot-strip according to claim 7 for small dimension continuous casting billet, it is characterised in that: two rollers
The lower roll (2-2) of reversible universal mill is plain-barreled roll, upper roller (2-1) is wedge shape roller.
9. the rough rolling device of the hot-strip according to claim 8 for small dimension continuous casting billet, it is characterised in that: driving
Mechanism is equipped with driving motor (3-6), and driving motor connects main shaft through gear drive (3-5), and driving motor is arranged two.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110976516A (en) * | 2019-12-30 | 2020-04-10 | 唐山市德龙钢铁有限公司 | Rolling method for eliminating roll marks on surface of hot-rolled strip steel |
| CN111783329A (en) * | 2020-06-03 | 2020-10-16 | 武汉科技大学 | Method for determining torsional rolling technological parameters of section steel |
| CN115138678A (en) * | 2022-07-12 | 2022-10-04 | 河南中孚高精铝材有限公司 | Rapid rolling method and system for aluminothermic continuous rolling roughing mill |
| CN116728021A (en) * | 2023-08-15 | 2023-09-12 | 江苏甬金金属科技有限公司 | Self-adaptive treatment method and system for stainless steel strip surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110976516A (en) * | 2019-12-30 | 2020-04-10 | 唐山市德龙钢铁有限公司 | Rolling method for eliminating roll marks on surface of hot-rolled strip steel |
| CN110976516B (en) * | 2019-12-30 | 2021-07-02 | 唐山市德龙钢铁有限公司 | Rolling method for eliminating roll marks on surface of hot-rolled strip steel |
| CN111783329A (en) * | 2020-06-03 | 2020-10-16 | 武汉科技大学 | Method for determining torsional rolling technological parameters of section steel |
| CN115138678A (en) * | 2022-07-12 | 2022-10-04 | 河南中孚高精铝材有限公司 | Rapid rolling method and system for aluminothermic continuous rolling roughing mill |
| CN116728021A (en) * | 2023-08-15 | 2023-09-12 | 江苏甬金金属科技有限公司 | Self-adaptive treatment method and system for stainless steel strip surface |
| CN116728021B (en) * | 2023-08-15 | 2023-11-14 | 江苏甬金金属科技有限公司 | Self-adaptive treatment method and system for stainless steel strip surface |
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