CN104148384B - The rolling mill practice method of ultra-thin ultra-wide steel plate - Google Patents
The rolling mill practice method of ultra-thin ultra-wide steel plate Download PDFInfo
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- CN104148384B CN104148384B CN201410414400.7A CN201410414400A CN104148384B CN 104148384 B CN104148384 B CN 104148384B CN 201410414400 A CN201410414400 A CN 201410414400A CN 104148384 B CN104148384 B CN 104148384B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 230
- 239000010959 steel Substances 0.000 title claims abstract description 230
- 238000005096 rolling process Methods 0.000 title claims abstract description 175
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000003801 milling Methods 0.000 claims abstract description 55
- 230000009467 reduction Effects 0.000 claims abstract description 50
- 238000007493 shaping process Methods 0.000 claims abstract description 19
- 238000002791 soaking Methods 0.000 claims abstract description 15
- 210000000988 bone and bone Anatomy 0.000 claims description 103
- 238000001816 cooling Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000004886 process control Methods 0.000 claims description 3
- 208000002193 Pain Diseases 0.000 description 4
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- 238000004519 manufacturing process Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000012886 linear function Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012821 model calculation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- 238000004513 sizing Methods 0.000 description 1
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Abstract
The present invention proposes a kind of rolling mill practice method of ultra-thin ultra-wide steel plate, the rolling mill practice method of described ultra-thin ultra-wide steel plate comprises: ensure that pusher-type furnace soaking temperature controls at 1200-1250 DEG C, ensure soaking zone time >=60 minutes, steel billet head and tail temperature difference is less than or equal to 30 DEG C; Dogbone rolling is adopted respectively in last passage in roughing shaping stage and broadening stage; The upper roller diameter 2-5mm of backing roll to be edge with the lower roller diameter of the plain-barreled roll roll shape working roll of chamfering be greater than working roll; Manipulator alignment degree difference is within 10mm; Roughing mill rolling pass is carried out control finish rolling according to 8-10 road and is rolled according to 6-8 passage, and the reduction ratio that the pressure of last three passages gradually reduces last three passages of finish rolling controls at 10%-15%; Two 11 roller straighteners are used to align.The present invention can use 2800mm milling train to produce below thickness 10mm, the steel plate of width more than 2600mm.
Description
Technical field
The present invention relates to field of metallurgy, belong to a kind of milling method of cut deal, in particular to a kind of rolling mill practice method of ultra-thin ultra-wide steel plate.
Background technology
Rolling therory traditionally, the Breadth Maximum that milling train can manufacture a finished product is that working roll barrel length size deducts certain size, and such as 2800mm heavy and medium plate mill is mainly for the production of more than thickness 10mm, and width is that 2400mm is with lower steel plate.And the steel plate of below gauge thickness 10mm, more than width 2400mm then needs larger milling train to carry out rolling, usually with 3800mm milling train or 5000mm mill milling.But, with 3800mm milling train or 5000mm mill milling below thickness 10mm, the steel plate of more than width 2400mm, especially below thickness 10mm, the steel plate of more than width 2600mm, although the width of finished product can increase, but because the working roll barrel length of milling train is larger, working roll roller footpath also increases thereupon, like this, steel plate for below rolling thickness 10mm needs milling train to have very high Adjustment precision, but along with the increase of operation roll of mill barrel length, the plate form control of milling train, Adjustment precision is more and more difficult, easily there is shape wave in the operation of rolling, camber, scrape frame, roll the problems such as useless, rolling hit rate is low, and on normal productive process and cost, there is larger impact.
Summary of the invention
The invention provides a kind of rolling mill practice method of ultra-thin ultra-wide steel plate, to solve ultra-thin ultra-wide steel plate (below thickness 10mm, the steel plate of width more than the 2600mm) problem that rolling hit rate is low.
For this reason, the present invention proposes a kind of rolling mill practice method of ultra-thin ultra-wide steel plate, the rolling mill practice method of described ultra-thin ultra-wide steel plate uses 2800mm milling train to produce below thickness 10mm, the steel plate of width more than 2600mm, and the rolling mill practice method of described ultra-thin ultra-wide steel plate comprises:
Computer heating control: adopt pusher-type furnace, ensures that pusher-type furnace soaking temperature controls at 1200-1250 DEG C, ensure soaking zone time >=60 minutes, steel billet head and tail temperature difference is less than or equal to 30 DEG C;
Steel plate plate form control: adopt dogbone rolling respectively in last passage in roughing shaping stage and broadening stage;
Roll shape controls: backing roll is the plain-barreled roll roll shape of edge with chamfering, edge chamfering ratio 3.5:200, and the lower roller diameter of working roll is greater than the upper roller diameter 2-5mm of working roll;
Roll rolipass design water management: Discrete control is carried out in breaker roll cooling, ensures roll effective cooling length 2000mm;
The use of manipulator: before the rolling, has carried out centering adjustment to the manipulator before the machine of finishing mill and after machine, and manipulator alignment degree difference is within 10mm;
Rolling procedure controls: roughing mill rolling pass controls according to 8-10 road, workpiece thickness is 32-42mm, finish rolling is rolled according to 6-8 passage, the drafts of last three passages gradually reduces, be rolled with prestissimo 120r/min after mill speed stings steel, the reduction ratio of last three passages of finish rolling controls at 10%-15% or more than 16%;
Straightening process controls: use two 11 roller straighteners to align.
Further, dogbone rolling is adopted in described roughing shaping stage, be scale dogbone rolling, be specially: control the head of steel plate and the thickness of afterbody according to linear rule, the dog-bone shapes of the steel plate of shaping stage is comprised: the first rectangular body, be positioned at the first head dog bone of described first rectangular body head and be positioned at the first afterbody dog bone of the first rectangular body afterbody, described first head dog bone and the first afterbody dog bone are all connected in described first rectangular body;
Described first head dog bone and the first afterbody dog bone are right angled triangle.
Further, the right angled triangle of the first head dog bone is of a size of:
SizingMASL＝10x
0；
SizingMASH=2 × A
2× h/B; A
2refer to roughing shaping stage, in the shape function of steel plate waist, along the maximum of steel plate length direction bulge amount; x
0refer to broadening rolling complete after steel plate waist shape function in, corresponding 1/2nd A
2the coordinate in the steel plate length direction at place;
Wherein, x
0=60+ (R
b)
-0.43+ (R
b/ R
l')
2.18
A
2＝-290+0.68×(R
b)
1.414+249×(R
b/R
l')
0.424，
SizingMASL---the first head dog bone length;
SizingMASH---the first head dog bone height;
B---blank width,
H---steel plate thickness when broadening rolling completes,
R
lsteel plate ratio of elongation after '--roll forming,
R
b---steel plate broadening ratio (broadening complete after steel plate width/blank width).
Further, described last passage of broadening stage adopts dogbone rolling, be broadening dogbone rolling, be specially: control the head of steel plate and the thickness of afterbody according to linear rule, the dog-bone shapes of the steel plate in broadening stage is comprised: the second rectangular body, be positioned at the second head dog bone of described second rectangular body head and be positioned at the second afterbody dog bone of the second rectangular body afterbody, described second head dog bone and the second afterbody dog bone are all connected in described second rectangular body;
Described second head dog bone and the second afterbody dog bone are right angled triangle.
Further, the right angled triangle of the second head dog bone is of a size of:
MASLength＝5x
0’；
MASHeight＝2×A
2’×h/L；
refer in the shape function of steel plate round end, the maximum of round end; x
0' refer in the shape function of steel plate round end, corresponding 1/2nd A
2' coordinate in steel plate width direction at place;
Wherein, x
0'=60+ (R
l)
-0.43+ (R
l/ R
b)
2.18,
A
2’＝-290+0.68×(R
l)
1.414+249×(R
l/R
b)
0.424，
MASLength-the second head dog bone length,
MASHeight---the second head dog bone height,
L---the steel plate length before broadening rolling,
H---finished steel plate thickness,
R
l---steel plate ratio of elongation, broadening rolling front spring length/finished steel plate length,
R
b---steel plate broadening ratio, finished steel plate width/blank width.
Further, described first head dog bone is identical with the shape and size of the first afterbody dog bone, is symmetrical arranged.
Further, produce 8mm × 2600mmQ235B steel plate with 2800mm milling train, billet size 220mm*1810mm*1117mm, roughing cogging thickness is 42mm, and roughing is 10 passages, reduction in pass is respectively 20mm, 24mm, 22mm, 20mm, 17mm, 22mm, 8mm, 14mm, 15mm, 16mm, finish rolling 8 passage, reduction in pass is respectively 8.84mm, 7.73mm, 6.8mm, 3.34mm, 2.89mm, 2.23mm, 1.68mm, 0.99mm, finish rolling reduction ratio is all more than 10%;
The lower roller diameter of working roll is 919.2mm, the upper roller diameter of working roll is 917.1mm, first head dog bone height and the first head dog bone length are respectively 4.05mm, 510mm, rough rolling step ensures that steel plate length direction width uniformity controls within 20mm, second head dog bone height and the second head dog bone length are respectively 1.58mm, 453mm.
Further, 10mm × 2700mmQ235B steel plate is produced with 2800mm milling train, billet size 220mm*1500mm*1928mm, roughing 10 passage, reduction in pass is respectively: 19.86mm, 28.45mm, 25.66mm, 20.47mm, 17.89mm, 17.2mm, 11.13mm, 14.24mm, 14.38mm, 12.71mm, finish rolling 8 passage, reduction in pass is respectively 4.27mm, 7.13mm, 4.08mm, 3.67mm, 3.5mm, 2.56mm, 2.05mm, 1.27mm, finishing pass reduction ratio is all more than 10%;
The lower roller diameter of working roll is 907.5, upper roller diameter is 905.6, first head dog bone height and the first head dog bone length are respectively 5.26mm, 529mm, rough rolling step ensures that steel plate length direction width uniformity controls within 20mm, second head dog bone height and the second head dog bone length are respectively 2.47mm, 400mm.
Further, 10mm × 2600mmQ345R steel plate is produced with 2800mm milling train, billet size 220mm*1580mm*1275mm, roughing 10 passage, reduction in pass is respectively 20.28mm, 23.83mm, 22.99mm, 18.41mm, 17.5mm, 20.68mm, 18.2mm, 20.43mm, 13.7mm, 10.61mm, finish rolling 6 passage, reduction in pass is respectively 6.79mm, 6.5mm, 3.37mm, 3.15mm, 2.71mm, 2.19mm, finishing pass reduction ratio is all more than 16%;
The lower roller diameter of working roll is 906.7, upper roller diameter is 904.3, first head dog bone height and the first head dog bone length are respectively 4.41mm, 600mm, rough rolling step ensures that steel plate length direction width uniformity controls within 20mm, second head dog bone height and the second head dog bone length are respectively 3.43mm, 460mm.
Effect of the present invention has:
1, the present invention produces below thickness 10mm by making 2800mm milling train to computer heating control, in the process of the steel plate of more than width 2600mm, can ensure that heating slab is even, reach desirable heating-up temperature, controlled and roll shape control by the planar plate types of steel plate, the undesirable deformation of steel plate round end and waist tubbiness can be overcome, control to ensure in the operation of rolling by rolling procedure, the rational deflection of steel plate and drafts, thus, 2800mm milling train can be used to produce below thickness 10mm, the steel plate of more than width 2600mm, the difficulty that the rolling hit rate that the steel plate overcoming use 3800mm milling train or 5000mm mill milling more than width 2600mm brings is low, rolling hit rate of the present invention can reach more than 98%.
2, in addition, the present invention can not only the steel plate of more than rolling width 2600mm, and thick below the degree 10mm of the present invention of rolling that can be stable, the steel plate of width more than 2600mm, like this, the ultra-thin ultra-wide steel plate that 3800mm milling train or 5000mm milling train can not roll out can be rolled out.
3 and then, the present invention is by being improved to linear function by the areal model of dogbone rolling, or the dog-bone shapes of existing complexity is improved to the dog-bone shapes of right angled triangle, like this, solve the linearizing problem of plan view control Systems Theory computation model, improve the bad shape of steel plate edge accurately, thus the width of the bad shape of the edge of steel plate is made accurately to be limited in controlled range, like this, just extend the rolling width of existing 2800mm milling train, make rolling width reach more than 2600mm.And, under the prerequisite that mill speed is constant, control the thickness of steel plate according to linear rule, guarantee rolls out dog-bone shapes, and model calculation speed reaches 0.001s, successfully meets the online requirement used, decrease the error rate of control system, add the stability of control system.
4, the present invention is by controlling plate form control, roll shape control, the control of roll rolipass design water management, rolling procedure, straightening process in computer heating control, steel plate rolling process, overcome the problem of the steel plate of more than the rolling width 2600mm that existing 2800mm milling train can not be stable, overcome occur in the operation of rolling shape wave, camber, scrape frame, roll the problems such as useless.
5, the present invention is by adopting dogbone rolling at the shaping stage of roughing and broadening stage, solve the problem of rolling thin and wide steel plate rolling process Strip Shape Control difficulty, decrease steel plate to insert the steel plate that causes of roller-way and to waft song, ensure that carrying out smoothly of the operation of rolling, improve rolling hit rate, reduce production cost.
6, improved the shape of ultra-thin ultra-wide steel plate head-tail and waist by dogbone rolling, improve shearing hit rate, ensure that rolling sizing ratio.
7, below thickness 10mm is produced with 2800mm milling train, the steel plate of more than width 2600mm, widen the description using 2800mm mill milling steel plate, like this, play the self-ability of 2800mm milling train on the one hand, on the other hand, also without the need to using 3800mm milling train or 5000mm mill milling ultra-wide steel plate again, decrease the construction of 3800mm milling train or 5000mm milling train production equipment, save the input of a large amount of factory buildings, fund, personnel, only with regard to the construction of a set of milling train, the fund input of several hundred million unit can just be saved.
8, the present invention's 2800mm milling train replaces 3800mm milling train or 5000mm mill milling ultra-wide steel plate, when the finished product of the same specification of rolling, working roll length of the present invention is far smaller than 3800mm milling train or 5000mm milling train, from energy resource consumption, comprise electric power, by water and control accuracy, cut damage, plate shape and precision, all have a clear superiority in than 3800mm milling train or 5000mm milling train.
Accompanying drawing explanation
Fig. 1 is the schematic shapes of the dog bone (scale dog bone) of shaping stage according to the embodiment of the present invention;
Fig. 2 is the shape function curve of the steel plate waist according to the embodiment of the present invention.
Drawing reference numeral illustrates:
The height limit of length sides 113 right angled triangle of hypotenuse 111 right angled triangle of 11 head dog bone 13 afterbody dog bone 110 right angled triangles
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
2800mm heavy and medium plate mill is used to produce ultra-thin ultra-wide steel plate (below thickness 10mm, more than width 2600mm), its rolling mill practice flow process comprises: heating → thick de-scaling → roughing → finish rolling → aligning → finishing → inspection → warehouse-in, and its major control method is as follows:
(1) computer heating control: ensure that pusher-type furnace No. 1 bringing-up section and soaking temperature control at 1200-1250 DEG C, billet surface does not exist the black print of obvious furnace ribbed tube, and the furnace ribbed tube place temperature difference controls within 50 DEG C, and steel billet head and tail temperature difference is less than or equal to 30 DEG C.Take burner hearth normal pressure to burn, ensure out fire door flame outer spray, reduce the cooling water that fire door and cold air impacts steel billet edge temperature; Extend steel billet in the time of soaking zone, ensure soaking zone time >=60 minutes.
(2) the squaring control of steel plate: use the squaring of plan view control Systematical control steel plate, the wide smallest point of steel plate hair controls at 70-80mm, and the head, middle and end stand out 10-20mm of steel plate, selects suitable dog bone according to actual billet size and finished size.Slab selection is section width 1810mm or 1500mm, thickness 220mm, and steel billet length adjusts according to mill product.Rolling mode adopts horizontal-vertical-horizontal or vertical-horizontal-vertical, ensures that scale dogbone rolling and broadening dogbone rolling all come into operation, ensures the squaring effect of steel plate.
(3) roll design and join roller: backing roll is the plain-barreled roll roll shape of edge with chamfering, and edge chamfering ratio 3.5:200 effectively can reduce the scaling of backing roll edge and cause roll to scrap.Design work roller roll shape to be convexity be ± 0 with+0.06 liang of class, roll profile is chosen according to rolling yield situation, lower roller diameter is selected to be greater than roller diameter 2-5mm, the trickle operation of the use of sled and the steel plate head of working good, to ensure the slight warpage of steel plate head, minimizing steel plate inserts roller-way and working roll causes curling round the roll accident.Rolling extreme trace time, insert roller-way cover plate cause steel plate to waft song for reducing steel plate, Biting Course sled is selected " 4 grades ", and after adding speed rolling after stinging steel, sled is selected " 1 grade " ensures that steel plate head tilts.
(4) roll rolipass design water management: Discrete control is carried out in breaker roll (working roll) cooling, at cooling water pipe two ends, the part of reserved 500mm does not design the mouth of a river respectively, ensures roll effective cooling length 2000mm.
(5) use of manipulator: before the rolling, has carried out centering adjustment to the manipulator before finishing mill machine and after machine, and manipulator alignment degree difference, within 10mm, to reduce steel plate edge sideslip, can ensure that steel-plate shape controls stable.
(6) rolling procedure design: roughing mill is rolled with minimum passage, controls according to 8-10 road according to specification rolling pass, to obtain larger drafts.Roughing mill cogging thickness is 32-42mm.Finish rolling is rolled according to 6-8 passage, and the pressure of last three passages gradually reduces, and is rolled after mill speed stings steel with prestissimo 120r/min.Finishing stands suitably strengthens the drafts (reduction ratio controls at 10%-15%) of last three passages, ensures that steel-plate shape is good, to obtain desirable width.
(7) straightening process controls: use 2 11 roller straighteners to align, No. 1 straightener adopts maximum reduction to align, and quickly through entering No. 2 straighteners, No. 2 straighteners take heavy reduction to align at a slow speed, make the stress of steel plate discharge fully in straightening process.2 11 roller straighteners carry out aligning employing straightener and align, and align compared to 2 11 roller straighteners, the present invention adopts 2 11 roller straighteners to align, and can be conducive to the aligning of ultra-thin ultra-wide steel plate, obtain better leveling effect.
The present invention is in roughing shaping stage (last passage) and last passage in broadening stage, all adopt dogbone rolling, be scale dogbone rolling and broadening dogbone rolling, the two all adopts carries out linearizing template model to dog bone model, and the mould shapes of the two is identical, such as the dog-bone shapes of the two includes: rectangular body, be positioned at the head dog bone of described rectangular body head and be positioned at the afterbody dog bone of rectangular body afterbody, and described head dog bone and afterbody dog bone are all connected in described rectangular body; Described head dog bone and afterbody dog bone are right angled triangle.Further, described head dog bone is identical with afterbody dog-bone shapes and center line along steel plate length direction is symmetrical, to realize simplify processes.
For scale dogbone rolling, the feature of dogbone rolling of the present invention is described:
The present invention by steel plain shape that broadening rolling is ended quantitatively measuring and analysis find out the shape function of steel plate waist, shape function (also referred to as logical function) according to steel plate waist is converted into the corresponding volume of bad shape, then according to volume transfer principle, can obtain needing to make up steel plate waist, make the straight required uneven variable quantity along steel plate length direction thickness of steel plate waist, when considering the control accuracy that AGC controls and control procedure, by linearizing processing method, by steel plate lumbar shape function linearization, obtain dog-bone shapes of the present invention to be rolled.
Roughing shaping stage, if steel plate adopts pair rolling, the shape of the steel plate waist drawn is then tubbiness, the steel plain shape quantitatively measuring and analysis of the present invention through ending to the rolling of roughing broadening, the shape function (or logistic curve, logical function) adopting plan recurrence mode to obtain steel plate waist is as shown in Figure 2:
y＝A
2+(A
1-A
2)/(1+(x/x
0)
p)(1)
Wherein, at roll forming stage or scale rolling sequence, y is the numerical value of the shape function of steel plate waist (or steel plate round end), A
2for the maximum of the shape function of steel plate waist, A
1for initial position numerical value in steel plate waist, initial position A1=0, x are the coordinate in vertical y direction, and x is steel plate coordinate along its length, and x0 is the numerical value of shape function in steel plate waist is A
2the coordinate value along its length of the steel plate corresponding to a half, p is the shape of function shape parameter, decision logic function, and according to the concrete condition of the application, p value is such as 1.5.
The shape function of the waist that formula (1) is steel plate or logistic curve, the shape of the waist of steel plate is tubbiness, and in addition, the present invention is linearisation dog bone model again, obtains:
SizingMASL＝kx
0(2)
SizingMASH＝2×A
2×h/B(3)
Wherein, x
0=60+ (R
b)
-0.43+ (R
b/ R
l')
2.18
A
2＝-290+0.68×(R
b)
1.414+249×(R
b/R
l')
0.424，
SizingMASL---the first head dog bone length;
SizingMASH---the first head dog bone height;
B---blank width,
H---steel plate thickness when broadening rolling completes,
R
lsteel plate ratio of elongation after '--roll forming,
R
b---steel plate broadening ratio (broadening complete after steel plate width/blank width).
The computation model that formula (2) and formula (3) they are dog bone size, this two formula and x
0, A
2calculating be that the various parameters such as the size of steel plate ratio of elongation, steel plate broadening ratio and slab according to shaping stage get by intending the modes such as recurrence.
On the basis of formula (1), adopt formula (2) and formula (3) just can obtain the concrete size of dog bone, as shown in Figure 1, the dog-bone shapes of last passage steel plate of being shaped is rectangular body 10, is positioned at the head dog bone 11 of described rectangular body 10 head and is positioned at the afterbody dog bone 13 of rectangular body afterbody, and head dog bone is identical with afterbody dog-bone shapes and center line along steel plate width direction is symmetrical.For head dog bone 11, head dog bone 11 is right angled triangle, comprising of the right angled triangle of head dog bone 11: the hypotenuse 110 of the length sides 111 of right angled triangle, the height limit 113 of right angled triangle and right angled triangle, wherein, SizingMASL is the length of the length sides 11 of dog bone length or right angled triangle.SizingMASH is the height on the height limit 113 of dog bone height or right angled triangle.
In formula (2), value of the present invention is that k is more than or equal to 8, be less than or equal to 12, be preferably k=10, this is got by modes such as plan recurrence according to various parameters such as the sizes of be shaped the steel plate ratio of elongation in (scale) stage, steel plate broadening ratio and slab.The present invention is by above-mentioned shape dog-bone shapes being converted into right angled triangle, both the distortion of steel plate waist and the bad shape of head had been fully taken into account, meet the deformation principle of steel plate waist and the bad shape of head, again to above-mentioned distortion inverting, return cutting edge aligned dog-bone shapes, make the dog bone of the right angled triangle of the present invention not only fully close dog bone making up the perfect condition needed for distortion of steel plate waist and the bad shape of head, and relative to the dog bone of perfect condition, the present invention more can conveniently calculate, and facilitates hydraulic pressing.
In like manner, the dog bone model in broadening stage of the present invention and the dog bone model shape of shaping stage are that identical (direction of the steel plate of broadening stage and shaping stage have rotated 90 degree, therefore, the broadening stage has differed 90 degree with the dog bone side of shaping stage), formula used is same or similar with some parameter, concrete coefficient and some parameter, such as coefficient k, and other design parameters are different, these are not both the different rolling features according to broadening stage and shaping stage, get according to test data.
Specifically describe several specific embodiment below: except being otherwise noted, the every dimensional units relating to steel plate in various embodiments of the present invention is mm, and after the rolling of roughing shaping stage (scale rolling), steel plate carries out broadening rolling again, eventually pass finish rolling, form finished product.
Embodiment 1:
This example uses 2800mm milling train to produce 8mm × 2600mmQ235B steel plate.Blank actual size 220mm*1810mm*1117mm, rolling thickness is 7.6mm (rolling with negative tolerance), and row's steel mode adopts cut surface to arrange steel.Roughing and finish rolling rolling 18 passage, wherein roughing 10 passage altogether, reduction in pass is respectively 20, and 24,22,20,17
, 22,8 (broadening extreme traces time), 14,15,16, reduction ratio is all more than 12% (except first passage and broadening extreme trace are secondary).Finish rolling 8 passage, reduction in pass is respectively 8.84,7.73,6.8,3.34,2.89,2.23,1.68,0.99, and reduction ratio is all more than 10%, and detailed process is as follows:
1) select suitable finishing mill backing roll, roll shape edge is with the plain-barreled roll roll shape of chamfering, and edge chamfering ratio 3.5:200, due to rolling scaduled less, select working roller to be ﹢ 0.06mm, work roll cooling was rolled after 8 hours.Roll effective cooling length is 2000mm.Before rolling, utilize the changeover time to carry out Alignment measuring to finish rolling and roughing mill manipulator, ensure that centering controls within 10mm.Select lower roller diameter to be 919.2mm, upper roller diameter is 917.1mm.Take burner hearth normal pressure to burn, ensure out fire door flame outer spray.
2) blank distinguishes 1225 DEG C in heating furnace No. 1 bringing-up section and No. 2 bringing-up section temperature, and 1168 DEG C, soaking zone temperature 1218 DEG C, soaking time 85min, time inside furnace is tapped after reaching 305min, and tapping temperature 1206 DEG C, carries out thick de-scaling through De-scaling box.There is not the black print of obvious furnace ribbed tube in billet surface, the furnace ribbed tube place temperature difference 38 DEG C, the steel billet north and south temperature difference 25 DEG C.
3) carry out 10 passes after entering roughing mill, roughing second passage, last passage high-pressure water descaling, ensure to enter finishing mill board surface quality.Roughing mill uses the rolling mode of transverse and longitudinal horizontal stroke, steel billet first axial rolling a time, and use scale dogbone rolling, dog bone height and length are respectively 4.05mm, 510mm, ensures that steel plate length direction width uniformity controls within 20mm.Be rolled down to the laggard line broadening MAS of broadening passage (broadening dog bone) rolling, dog bone height and length are respectively 1.58mm, 453mm, ensure steel plate not straight end to end.Cogging thickness is 42mm, the wide 90mm of hair in the middle part of rolled plate, the wide 70-80mm of steel plate head dodds.
4) after roughing terminates, enter finishing mill fast by conveyor roller, ensure that finish rolling start rolling temperature reaches more than 1050 DEG C, the de-scaling of finish rolling first passage, each percentage pass reduction reduces gradually, and last three reductions in pass are respectively 2.23mm, 1.68mm, 0.99mm, reduction ratio is respectively 17.98%, and 16.52%, 11.66%, all reach more than 10%, effectively ensure that rolled plate plate shape is good.Finish rolling 1-7 passage sled gear uses " 4 grades ", use milling train water curtain to drench on steel plate before stinging steel and show, ensure that steel plate goes out milling train head and tilts.Finish rolling the 8th passage steel plate uses before nipping " 4 grades ", after having nipped, underspeed, use " 1 grade ", slightly tilt after making steel plate on the east go out milling train, stop steel plate and insert roller-way.
5), after finish rolling rolling completes, steel plate is sent into fast in No. 1 11 roller straighteners and is carried out heavy reduction aligning, ensures out the glacing flatness of straightener steel plate.No. 1 straightener makes at a gallop to align, and the steel plate aligned is sent into No. 2 11 roller straighteners fast, and No. 2 11 roller straighteners use middling speed to align, and steel plate stress is discharged in straightener, obtains straight steel plate.
Embodiment 2: this example uses 2800mm milling train to produce 10mm × 2700mmQ235B steel plate.Blank actual size 220mm*1500mm*1928mm, rolling thickness is 9.8mm (rolling with negative tolerance), and row's steel mode adopts normally arranges steel.Roughing and finish rolling rolling 18 passage, wherein roughing 10 passage altogether, reduction in pass is respectively 19.86,28.45,25.66,20.47,17.89,17.2,11.13,14.24,14.38,12.71, and percentage pass reduction all more than 12% (except first passage).Finish rolling 8 passage, reduction in pass is respectively 4.27,7.13,4.08,3.67,3.5,2.56,2.05,1.27, and percentage pass reduction is all more than 10%.Detailed process is as follows:
1) select suitable finishing mill backing roll, roll shape edge is with the plain-barreled roll roll shape of chamfering, and edge chamfering ratio 3.5:200, due to rolling scaduled less, select working roller to be ﹢ 0.06mm, work roll cooling was rolled after 8 hours.Roll effective cooling length is 2000mm.Before rolling, utilize the changeover time to carry out Alignment measuring to finish rolling and roughing mill manipulator, ensure that centering controls within 10mm.Select lower roller diameter to be 907.5mm, upper roller diameter is 905.6mm.Take burner hearth normal pressure to burn, ensure out fire door flame outer spray.
2) blank is in heating furnace 1 bringing-up section and 2 bringing-up section temperature 1216 DEG C, 1190 DEG C, soaking zone temperature 1204 DEG C, soaking time 89min, and time inside furnace is tapped after reaching more than 291min, and tapping temperature 1200 DEG C, carries out thick de-scaling through De-scaling box.There is not the black print of obvious furnace ribbed tube in billet surface, the furnace ribbed tube place temperature difference controls within 29 DEG C, 18 DEG C, the steel billet north and south temperature difference (head and tail temperature difference).
3) carry out 10 passes after entering roughing mill, percentage pass reduction first increases and then reduces, roughing second passage, last passage high-pressure water descaling, ensures to enter finishing mill board surface quality.Roughing mill uses the rolling mode of transverse and longitudinal horizontal stroke, steel billet first axial rolling a time, and use scale MAS, dog bone height and length are respectively 5.26mm, 529mm, ensures that steel plate length direction width uniformity controls within 20mm.Be rolled down to broadening passage laggard line broadening MAS rolling, dog bone height and length are respectively 2.47mm, 400mm, ensure steel plate not straight end to end.The wide 90mm of hair in the middle part of rolled plate, the wide 70-80mm of steel plate head dodds.
4) after roughing terminates, enter finishing mill fast by conveyor roller, ensure that finish rolling start rolling temperature reaches more than 1050 DEG C, the de-scaling of finish rolling first passage, each percentage pass reduction reduces gradually, and last three reductions in pass are respectively 2.56,2.05,1.27, reduction ratio is respectively 16.68%, and 16.03%, 11.82%, all reach more than 10%, effectively ensure that rolled plate plate shape is good.Finish rolling 1-7 passage sled gear uses " 4 grades ", use milling train water curtain to drench on steel plate before stinging steel and show, ensure that steel plate goes out milling train head and tilts.Finish rolling the 8th passage steel plate uses before nipping " 4 grades ", after having nipped, use " 1 grade ", slightly tilt after making steel plate on the east go out milling train, stop steel plate and insert roller-way.
5), after finish rolling rolling completes, steel plate is sent into fast in No. 1 11 roller straighteners and is carried out heavy reduction aligning, ensures out the glacing flatness of straightener steel plate.No. 1 straightener makes at a gallop to align, and the steel plate aligned is sent into No. 2 11 roller straighteners fast, and No. 2 11 roller straighteners use middling speed to align, and steel plate stress is discharged in straightener, obtains straight steel plate.
Embodiment 3: this example uses 2800mm milling train to produce 10mm × 2600mmQ345R steel plate.Blank actual size 220mm*1580mm*1275mm, rolling thickness is 9.8mm (rolling with negative tolerance), and row's steel mode adopts normally arranges steel.Roughing and finish rolling rolling 16 passage, wherein roughing 10 passage altogether, reduction in pass is respectively 20.28, and 23.83,22.99,18.41,17.5,20.68,18.2,20.43,13.7,10.61, percentage pass reduction all more than 12% (except first passage), finish rolling 6 passage, reduction in pass is respectively 6.79,6.5,3.37,3.15,2.71,2.19, percentage pass reduction is all more than 16%, and detailed process is as follows:
1) select suitable finishing mill backing roll, roll shape edge is with the plain-barreled roll roll shape of chamfering, and edge chamfering ratio 3.5:200, due to rolling scaduled less, select working roller to be ﹢ 0.06mm, work roll cooling was rolled after 2 hours.Roll effective cooling length is 2000mm.Before rolling, utilize the changeover time to carry out Alignment measuring to finish rolling and roughing mill manipulator, ensure that centering controls within 10mm.Select lower roller diameter to be 906.7mm, upper roller diameter is 904.3mm.Take burner hearth normal pressure to burn, ensure out fire door flame outer spray.
2) blank is in heating furnace 1 bringing-up section and 2 bringing-up section temperature 1203 DEG C respectively, and 1108 DEG C, soaking zone temperature 1227 DEG C, soaking time 103min, time inside furnace is tapped after reaching 333min, and tapping temperature 1213 DEG C, carries out thick de-scaling through De-scaling box.There is not the black print of obvious furnace ribbed tube in billet surface, the furnace ribbed tube place temperature difference 45 DEG C, the steel billet north and south temperature difference 24 DEG C.
3) carry out 10 passes after entering roughing mill, percentage pass reduction first increases and then reduces, roughing second passage, last passage high-pressure water descaling, ensures to enter finishing mill board surface quality.Roughing mill uses the rolling mode of transverse and longitudinal horizontal stroke, steel billet first axial rolling a time, and use scale MAS, dog bone height and length are respectively 4.41mm, 600mm, ensures that steel plate length direction width uniformity controls within 20mm.Be rolled down to broadening passage laggard line broadening MAS rolling, dog bone height and length are respectively 3.43mm, 460mm, ensure steel plate end to end straight.The wide 90mm of hair in the middle part of rolled plate, the wide 70-80mm of steel plate head dodds.
4) after roughing terminates, enter finishing mill fast by conveyor roller, ensure that finish rolling start rolling temperature reaches more than 1050 DEG C, the de-scaling of finish rolling first passage, each percentage pass reduction reduces gradually, and last three reductions in pass are respectively 3.15,2.71,2.19, reduction ratio is respectively 18.17%, and 19.09%, 19.08%, all reach more than 10%, effectively ensure that rolled plate plate shape is good.Finish rolling 1-5 passage sled gear uses " 4 grades ", use milling train water curtain to drench on steel plate before stinging steel and show, ensure that steel plate goes out milling train head and tilts.Finish rolling the 6th passage steel plate uses before nipping " 4 grades ", after having nipped, use " 1 grade ", slightly tilt after making steel plate on the east go out milling train, stop steel plate and insert roller-way.
5), after finish rolling rolling completes, steel plate is sent into fast in No. 1 11 roller straighteners and is carried out heavy reduction aligning, ensures out the glacing flatness of straightener steel plate.No. 1 straightener makes at a gallop to align, and the steel plate aligned is sent into No. 2 11 roller straighteners fast, and No. 2 11 roller straighteners use middling speed to align, and steel plate stress is discharged in straightener, obtains straight steel plate.
In the above embodiment of the present invention, the reasonable coordination of each technique and technological parameter wherein form organic parameter system, and final realization uses 2800mm milling train to produce below thickness 10mm, the steel plate of width more than 2600mm.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.For each part of the present invention can mutually combine under the condition of not conflicting, any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (9)
1. the rolling mill practice method of a ultra-thin ultra-wide steel plate, it is characterized in that, the rolling mill practice method of described ultra-thin ultra-wide steel plate uses 2800mm milling train to produce below thickness 10mm, the steel plate of width more than 2600mm, and the rolling mill practice method of described ultra-thin ultra-wide steel plate comprises:
Computer heating control: adopt pusher-type furnace, ensures that pusher-type furnace soaking temperature controls at 1200-1250 DEG C, ensure soaking zone time >=60 minutes, steel billet head and tail temperature difference is less than or equal to 30 DEG C;
Steel plate plate form control: adopt dogbone rolling respectively in last passage in roughing shaping stage and broadening stage;
Roll shape controls: backing roll is the plain-barreled roll roll shape of edge with chamfering, edge chamfering ratio 3.5:200, and the lower roller diameter of working roll is greater than the upper roller diameter 2-5mm of working roll;
Roll rolipass design water management: Discrete control is carried out in breaker roll cooling, ensures roll effective cooling length 2000mm;
The use of manipulator: before the rolling, has carried out centering adjustment to the manipulator before the machine of finishing mill and after machine, and manipulator alignment degree difference is within 10mm;
Rolling procedure controls: roughing mill rolling pass controls according to 8-10 road, workpiece thickness is 32-42mm, finish rolling is rolled according to 6-8 passage, the drafts of last three passages gradually reduces, be rolled with prestissimo 120r/min after mill speed stings steel, the reduction ratio of last three passages of finish rolling controls at 10%-15% or more than 16%;
Straightening process controls: use two 11 roller straighteners to align.
2. the rolling mill practice method of ultra-thin ultra-wide steel plate as claimed in claim 1, it is characterized in that, dogbone rolling is adopted in described roughing shaping stage, be scale dogbone rolling, be specially: control the head of steel plate and the thickness of afterbody according to linear rule, the dog-bone shapes of the steel plate of shaping stage is comprised: the first rectangular body, be positioned at the first head dog bone of described first rectangular body head and be positioned at the first afterbody dog bone of the first rectangular body afterbody, described first head dog bone and the first afterbody dog bone are all connected in described first rectangular body;
Described first head dog bone and the first afterbody dog bone are right angled triangle.
3. the rolling mill practice method of ultra-thin ultra-wide steel plate as claimed in claim 2, is characterized in that, the right angled triangle of the first head dog bone is of a size of:
SizingMASL＝10x
0；
SizingMASH=2 × A
2× h/B; A
2refer to roughing shaping stage, in the shape function of steel plate waist, along the maximum of steel plate length direction bulge amount; x
0refer to broadening rolling complete after steel plate waist shape function in, corresponding 1/2nd A
2the coordinate in the steel plate length direction at place;
Wherein, x
0=60+ (R
b)
-0.43+ (R
b/ R
l')
2.18
A
2＝-290+0.68×(R
b)
1.414+249×(R
b/R
l')
0.424，
SizingMASL---the first head dog bone length;
SizingMASH---the first head dog bone height;
B---blank width,
H---steel plate thickness when broadening rolling completes,
R
lsteel plate ratio of elongation after '--roll forming,
R
b---steel plate broadening ratio (broadening complete after steel plate width/blank width).
4. the rolling mill practice method of the ultra-thin ultra-wide steel plate as described in any one of claims 1 to 3, it is characterized in that, described last passage of broadening stage adopts dogbone rolling, be broadening dogbone rolling, be specially: control the head of steel plate and the thickness of afterbody according to linear rule, the dog-bone shapes of the steel plate in broadening stage is comprised: the second rectangular body, be positioned at the second head dog bone of described second rectangular body head and be positioned at the second afterbody dog bone of the second rectangular body afterbody, described second head dog bone and the second afterbody dog bone are all connected in described second rectangular body,
Described second head dog bone and the second afterbody dog bone are right angled triangle.
5. the rolling mill practice method of ultra-thin ultra-wide steel plate as claimed in claim 4, is characterized in that, the right angled triangle of the second head dog bone is of a size of:
MASLength＝5x
0’；
MASHeight＝2×A
2’×h/L；
A
2' refer in the shape function of steel plate round end, the maximum of round end; x
0' refer in the shape function of steel plate round end, corresponding 1/2nd A
2' coordinate in steel plate width direction at place;
Wherein, x
0'=60+ (R
l)
-0.43+ (R
l/ R
b)
2.18,
A
2’＝-290+0.68×(R
l)
1.414+249×(R
l/R
b)
0.424，
MASLength-the second head dog bone length,
MASHeight---the second head dog bone height,
L---the steel plate length before broadening rolling,
H---finished steel plate thickness,
R
l---steel plate ratio of elongation, broadening rolling front spring length/finished steel plate length,
R
b---steel plate broadening ratio, finished steel plate width/blank width.
6. the rolling mill practice method of ultra-thin ultra-wide steel plate as claimed in claim 3, is characterized in that, described first head dog bone is identical with the shape and size of the first afterbody dog bone, is symmetrical arranged.
7. the rolling mill practice method of ultra-thin ultra-wide steel plate as claimed in claim 4, is characterized in that, produces 8mm × 2600mmQ235B steel plate with 2800mm milling train, billet size 220mm*1810mm*1117mm, roughing cogging thickness is 42mm, and roughing is 10 passages, reduction in pass is respectively 20mm, 24mm, 22mm, 20mm, 17mm, 22mm, 8mm, 14mm, 15mm, 16mm, finish rolling 8 passage, reduction in pass is respectively 8.84mm, 7.73mm, 6.8mm, 3.34mm, 2.89mm, 2.23mm, 1.68mm, 0.99mm, finish rolling reduction ratio is all more than 10%;
The lower roller diameter of working roll is 919.2mm, the upper roller diameter of working roll is 917.1mm, first head dog bone height and the first head dog bone length are respectively 4.05mm, 510mm, rough rolling step ensures that steel plate length direction width uniformity controls within 20mm, second head dog bone height and the second head dog bone length are respectively 1.58mm, 453mm.
8. the rolling mill practice method of ultra-thin ultra-wide steel plate as claimed in claim 4, it is characterized in that, 10mm × 2700mmQ235B steel plate is produced with 2800mm milling train, billet size 220mm*1500mm*1928mm, roughing 10 passage, reduction in pass is respectively: 19.86mm, 28.45mm, 25.66mm, 20.47mm, 17.89mm, 17.2mm, 11.13mm, 14.24mm, 14.38mm, 12.71mm, finish rolling 8 passage, reduction in pass is respectively 4.27mm, 7.13mm, 4.08mm, 3.67mm, 3.5mm, 2.56mm, 2.05mm, 1.27mm, finishing pass reduction ratio is all more than 10%,
The lower roller diameter of working roll is 907.5, upper roller diameter is 905.6, first head dog bone height and the first head dog bone length are respectively 5.26mm, 529mm, rough rolling step ensures that steel plate length direction width uniformity controls within 20mm, second head dog bone height and the second head dog bone length are respectively 2.47mm, 400mm.
9. the rolling mill practice method of ultra-thin ultra-wide steel plate as claimed in claim 4, is characterized in that, produces 10mm × 2600mmQ345R steel plate with 2800mm milling train, billet size 220mm*1580mm*1275mm, roughing 10 passage, reduction in pass is respectively 20.28mm, 23.83mm, 22.99mm, 18.41mm, 17.5mm, 20.68mm, 18.2mm, 20.43mm, 13.7mm, 10.61mm, finish rolling 6 passage, reduction in pass is respectively 6.79mm, 6.5mm, 3.37mm, 3.15mm, 2.71mm, 2.19mm, finishing pass reduction ratio is all more than 16%;
The lower roller diameter of working roll is 906.7, upper roller diameter is 904.3, first head dog bone height and the first head dog bone length are respectively 4.41mm, 600mm, rough rolling step ensures that steel plate length direction width uniformity controls within 20mm, second head dog bone height and the second head dog bone length are respectively 3.43mm, 460mm.
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| CN109513745B (en) * | 2018-11-30 | 2020-04-28 | 湖南华菱湘潭钢铁有限公司 | Method for rolling wide and thin plate by wide and thick plate rolling mill |
| CN110369519B (en) * | 2019-07-23 | 2020-10-02 | 唐山中厚板材有限公司 | Plate type control method for 500 MPa-level low-alloy high-strength steel plate in rolling process |
| CN111389928B (en) * | 2020-03-30 | 2022-03-22 | 南京钢铁股份有限公司 | Method for producing ultrathin and ultra-wide limit specification nuclear power steel by wide and thick plate rolling mill |
| CN111729939A (en) * | 2020-05-15 | 2020-10-02 | 南京钢铁股份有限公司 | Method for reducing impact of heavy and medium plate mill head |
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| CN114669628B (en) * | 2022-05-16 | 2023-11-24 | 宝钢湛江钢铁有限公司 | Method for eliminating longitudinal indentation of new roller tying machine of thermal straightening machine |
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