CN1599648A - Continous hot rolling facility - Google Patents

Continous hot rolling facility Download PDF

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Publication number
CN1599648A
CN1599648A CN02823926.1A CN02823926A CN1599648A CN 1599648 A CN1599648 A CN 1599648A CN 02823926 A CN02823926 A CN 02823926A CN 1599648 A CN1599648 A CN 1599648A
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CN
China
Prior art keywords
rolling
mill
power
back segment
roller mill
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Pending
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CN02823926.1A
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Chinese (zh)
Inventor
仓桥隆郎
上野伸二
小松隆义
高桥昌范
足立明夫
高冈真司
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Nakayama Steel Works Ltd
Kawasaki Motors Ltd
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Nakayama Steel Works Ltd
Kawasaki Jukogyo KK
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Application filed by Nakayama Steel Works Ltd, Kawasaki Jukogyo KK filed Critical Nakayama Steel Works Ltd
Publication of CN1599648A publication Critical patent/CN1599648A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • B21B2267/06—Roll diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • B21B2267/06—Roll diameter
    • B21B2267/065—Top and bottom roll have different diameters; Asymmetrical rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/04—Lateral deviation, meandering, camber of product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/10—Motor power; motor current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/10—Motor power; motor current
    • B21B2275/12—Roll torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
    • B21B35/02—Drives for metal-rolling mills, e.g. hydraulic drives for continuously-operating mills
    • B21B35/04—Drives for metal-rolling mills, e.g. hydraulic drives for continuously-operating mills each stand having its own motor or motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The hot tandem mill comprises multiple-frame mill front section, and multi-frame mill back section on backward side of said front section, at least two mills are reducing roller mill or ultrathin roller mill and separately equipped with drive motor, power of the drive motor is higher than the drive motor on upper of the reducing roller mill or ultrathin roller mill. The equipment is suitable for producing fine hot rolled steel plate.

Description

Hot continuous rolling equipment
Technical field
The present invention relates to a kind of hot continuous rolling equipment that has based on the thin brilliant hot rolled steel plate of the microscopic structure of thin grained ferrite that is suitable for making.
Background technology
In the past, in the occasion of utilizing 5-7 frame tandem hot continuous rolling (essence) milling train hot rolled steel sheet, rolling scaduled is to set the rolling load maximum in promptly the 2nd (or the 3rd) so mostly.This be because, a) in the 1st, slab (rolled piece) still heavy back is brought from the upstream, in this case, if rolling load is too high, then the slab head probably can't be nipped in the roll; B) in reducing the back segment frame of slab thickness, if sheet billet is applied high rolling load, then sheet material is easy to into snakelike (S curved) and plate shape such as flatness etc. usually worsen.Rolling scaduled for example being documented in No. 2635796 communiques of Japan Patent (its Fig. 2,3) like this.
In traditional hot continuous rolling equipment, based on so rolling scaduled, the power of the drive motor of the rolling mill in each frame is to determine like this.
I) at second or comprise that the power of motor in the leading portion frame of this frame is the highest, the power of motor of back segment reduces.Distribute according to above-mentioned rolling load, the motor of back segment frame has output torque and thereby the deficiency littler than the motor of leading portion frame.
Considered also that ii) rolling load makes the power of motor of institute's organic frame equate distributively.Obtained and equipment cost and installation advantages associated owing to having unified motor form.
Iii) the power of motor of back segment frame is slightly higher than the power of motor of leading portion frame.
Except above-mentioned rolling load distributes, to consider that also the slab transporting velocity increases along with the sheet material attenuate, and when in back segment, using thin roll, will improve its required velocity of rotation etc.
In traditional hot continuous rolling equipment, the hot rolled steel plate that being difficult to produce inside has the high-mechanical property of trickle ferritic structure is so-called thin brilliant hot rolled steel plate.Manufacture method as thin brilliant hot rolled steel plate, exist so-called rolling and the controlled rolling method depressed greatly, when adopting any method, it is rolling to implement heavy reduction rate in all must the several frames in the back segment of finish rolling equipment, but still is difficult to stipulate as described above to implement on the legacy equipment of power of motor of each rolling mill so rolling.
And depressing rolling greatly is such method, promptly depresses strain-induced phase transformation and thereby the realization structure refinement of facilitating from austenite phase (γ phase) to ferritic phase (α phase) greatly by austenite crystal is applied.And the controlled rolling method is such method, promptly not only by containing niobium and titanium and under the precipitation strength effect of niobium, titanium, realizing heavily stressedization, and when utilizing niobium, titanium that the inhibitory action of the crystallization again of austenite crystal is implemented zerolling (ferrite area is rolling), promoted strain-induced phase transformation and realized the ferrite crystal grain refinement thus from γ to the α phase.
The reason that is difficult to rolling fine-grained steel in traditional equipment is as described below.
At first, above-mentionedly depress rollingly greatly to what be used to obtain thin brilliant hot rolled steel plate, the inventor investigates, and found that, for example the accumulation strain of back segment three rolling mills is necessary for more than 0.9.Here, " strain " be meant, in the steel plate thickness h of the entrance side of each section milling train 0Thickness h with outlet side 1Difference divided by both average thickness, i.e. ε=(h 0-h 1)/{ (h 0+ h 1)/2}.And accumulation strain is meant, strain in each frame (frame of its upstream is not considered because of influence power is little) of back segment three rolling mills in above-mentioned milling train (two time also can obtain) weight under considering the situation of metal structure influence adds up, when the strain in finish to gauge frame, its upstream next-door neighbour's frame and frame that the upstream is close to again is taken as ε respectively n, ε N-1, ε N-2The time, use ε 0=ε n+ ε N-1/ 2+ ε N-2The ε of/4 expressions 0It is exactly accumulation strain.
In order to carry out accumulation strain is depressing greatly more than 0.9, for example must carry out reduction ratio and be (strain is more than 0.5) rolling more than 40% in each rolling mill of back segment.In traditional hot rolling plant according to the rolling plan, the reduction ratio maximum of setting in three rolling mills of back segment is no more than about 30%, according to above-mentioned i) set in the example of power of motor, the power of back segment motor does not have surplus, therefore, in back segment, be difficult to realize reduction ratio reach 40% and accumulation strain be the depressing greatly of such degree more than 0.9.
In addition, as above-mentioned ii), iii) as described in, even if in the example of the power of motor of the milling train that improves back segment, do not increase rolling load yet and realize above-mentioned leeway of depressing greatly usually.Even if the power of motor of back segment is very high, the difference power of comparing with leading portion also generally expends and makes on the roll quick rotation of back segment milling train.On the contrary, even if the back segment power of motor has suitable surplus and can depress greatly fully in back segment, as above-mentioned b) shown in, also can't solve with incident strip under the very thin situation of plate and crawl and the relevant problem of shape deterioration.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of be suitable for making thin brilliant hot rolled steel plate, strip passes rolling mill characteristic (anti-snake is curved) and the also outstanding hot continuous rolling equipment of plate shape.
Characteristics according to hot continuous rolling equipment of the present invention are, it comprises the leading portion with multi-set of rolling mill, the downstream and the back segment that have multi-set of rolling mill that is arranged on described leading portion on the rolled piece traffic direction, at least two rolling mills of described back segment are reducing roller mill or ultra-fine roller mill, at least two the described reducing roller mills or the described ultra-fine roller mill of described back segment are equipped with such drive motors respectively, and promptly the power ratio of these drive motors is arranged on the power height of drive motors of any rolling mill of described reducing roller mill or described ultra-fine roller mill upstream.
In addition, preferably including the finish to gauge frame is described reducing roller mill or described ultra-fine roller mill at least two rolling mills continuously of interior described back segment.
And best described back segment has at least three rolling mills, and two rolling mills wherein or three rolling mills are described reducing roller mill or described ultra-fine roller mill.
Here, ultra-fine roller mill be meant its a pair of working roll diameter all less than 600 millimeters milling train.And the reducing roller mill is meant that the unequal and equivalent roller diameter a pair of working roll up and down of the diameter of its a pair of working roll (roller footpath mean value) is less than 600 millimeters milling trains.But, the equivalent roller footpath of reducing roller mill or the roller footpath of ultra-fine roller mill preferably are thought of as below 550 millimeters from functional perspective, and are generally requiring more than 400 millimeters aspect the intensity.
In this equipment for continuously rolling, at first, the power of the drive motors of two above milling trains of leading portion is higher than the power of motor of its upstream frame, thereby, can in to the frame of the strong back segment of the influence of metal structure, depress rolling greatly.And, in this rolling equipment, because two above milling trains of back segment are reducing roller mill or ultra-fine roller mill, so even if the plate of attenuation is depressed greatly, the also difficult strip that takes place is crawled and the deterioration of plate shape.This is because utilize smaller rolling load to carry out high rolling of reduction ratio (and strain) in the milling train of such form.When rolling load hour, power on plate width direction (motive force) also reduces, thereby, be difficult to occur crawling.In addition, the result who reduces the roll flattening deflection is exactly also to have reduced shape defect such as so-called edge attenuate.Like this, be difficult to take place to pass the rolling mill characteristic defective relevant with plate shape with strip, so, in back segment, corresponding to power of motor significantly improve reduction ratio, accumulation strain also can reach more than 0.9, and thus one, in this rolling equipment, can produce thin brilliant hot rolled steel plate with trickle ferritic structure.
In addition, any milling train more than of described leading portion or described back segment preferably has the CVC function.
Here, the CVC function is meant such function, external diameter is changed continuously and the roll (CVC roller) that forms moves vertically, just can control roll gap shape changeably thus.There is the milling train of such function to be called as the CVC milling train.
Utilize such hot continuous rolling equipment, just can further improve the control characteristic that the strip in back segment is passed rolling mill characteristic and plate shape.Milling train with CVC function can change and control roll gap shape in the scope of broadness, therefore, can prevent the andante shape control of going forward side by side of convexity that bending and thermal expansion by roll cause effectively, in addition, thus one, strengthened also preventing that the strip in back segment from passing the unsettled effect of milling train.In addition, have at the milling train that makes above-mentioned back segment under the situation of CVC function, can be advantageously near the stage of finished product directly and critically control, improve strip and pass rolling mill characteristic and plate shape, under the occasion of giving its upstream this function of milling train, exist by thicker plate being applied the advantage that control is controlled on a large scale.
In addition, the power of at least two the described reducing roller mills of best described back segment or the described drive motors separately of described ultra-fine roller mill is configured to them and does not have all the same size, and the power of motor of the rolling-mill housing in its downstream is configured to be not less than the power of motor of the rolling-mill housing of its upstream.
And, comprise the preferably described reducing roller mill of three rolling mills or the described ultra-fine roller mill of the described back segment of finish to gauge frame, the power that the power of the described drive motors separately of three reducing roller mills of this of described back segment or ultra-fine roller mill is decided to be the drive motors of this finish to gauge frame is P n, the drive motors power of the rolling-mill housing of its upstream is P N-1, the power of the drive motors of the rolling-mill housing of upstream is P again N-2, wherein, P n＞P N-1〉=P N-2, perhaps P n〉=P N-1＞P N-2
In order in back segment, to depress rolling greatly and to guarantee sufficiently high accumulation strain ε for obtaining thin brilliant hot rolled steel plate as described above c, it is effective improving strain stress (or reduction ratio) near the finish to gauge frame.Rolling finish to gauge frame or its contiguous frame of aspect the appreciable impact metal structure, being not so good as in the frame of upstream, therefore, make aspect the strip that same metal structure is arranged on the average reduction ratio ground of all rolling-mill housing of raising within reason, in the finish to gauge frame or to depress greatly on the frame near it be favourable.Therefore, according to this rolling equipment, thin brilliant hot rolled steel plate can made very effectively aspect equipment cost and the energy consumption.
In addition, the power ratio of the described drive motors separately of at least two of best described back segment described reducing roller mills or described ultra-fine roller mill is high more than 15% at the power of the described drive motors of arbitrary rolling mill of the upstream of described reducing roller mill or described ultra-fine roller mill.
For example, be under the occasion of reducing roller mill or ultra-fine roller mill at continuous three rolling mills of the back segment that comprises the finish to gauge frame, the power wherein always power of the drive motors of minimum finish to gauge frame is P n, be configured in the 1st, the 2nd of upstream ... the power of each drive motors of n-3 rolling mill is P 1, P 2P N-3, their pass is P n〉=Max (P 1, P 2P N-3) * 1.15.
In addition, the peak power in the described drive motors power of at least two described reducing roller mills at least of best described back segment or described ultra-fine roller mill is higher more than 30% than the power of the described drive motors of the arbitrary rolling mill that is arranged on described reducing roller mill or ultra-fine roller mill upstream.
For example, be under the occasion of reducing roller mill or ultra-fine roller mill at continuous three rolling mills of the back segment that comprises the finish to gauge frame, the power P of these drive motors n, P N-1, P N-2Be configured in the 1st, the 2nd of upstream ... the power of each drive motors of n-3 rolling mill is P 1, P 2P N-3The pass be Max (P N-2, P N-1, P n) P n〉=Max (P 1, P 2P N-3) * 1.3.
If consider rolling influence power as described above, then under the occasion of making the fine-grained steel hot rolled plate, need be rolled with very high reduction ratio in the upstream side milling train in rolling equipment metal structure.On the other hand, in the milling train of the back segment that comprises the finish to gauge frame, preferably carry out accumulation strain reach more than 0.9 depress greatly rolling.Therefore, the rolling equipment of comparing the raising of quite big degree with leading portion of the power of motor in two rolling mills of back segment that are reducing roller mill or ultra-fine roller mill just becomes and can successfully make the actual of thin brilliant hot rolled steel plate and rational equipment.Because it is lower many than back segment power of motor that the power of motor of not depressing rolling leading portion milling train greatly is configured to, so, exist the not advantage of non-productive work of equipment.And in this equipment, as described above, the power of motor of finish to gauge frame is configured to the highest all favourable to cost of equipment and energy consumption.
In addition, be preferably at least two the described reducing roller mills of described back segment or the outlet side separately of described ultra-fine roller mill, be provided with the curtain type cooling device that is used to cool off described rolled piece.
Curtain type cooling device is such cooling way, and promptly a large amount of cooling waters flow with the state of laminar flow or similar laminar flow according to continuous curtain form and cooling water flows on the upper and lower surface of rolled plate with covering whole width from upper and lower side.
By the thin brilliant hot rolled steel plate of hot continuous rolling device fabrication the time, in applying the frame of depressing greatly, sheet material is cooled off strongly.This be because, when carrying out high rolling of reduction ratio, the sheet material temperature is significantly raise because processing produces heat, temperature is above the temperature range that is suitable for depressing greatly rolling and controlled rolling method.If cooling effect is strong inadequately, then need to reduce mill speed, this makes economic production carry out probably.
To this, a large amount of cooling waters that curtain type cooling device flows as described above cool off rolled piece strongly, thereby, suppressed to follow the sheet material of depressing rolling generation greatly to heat up effectively.Even if under the situation of quickening sheet material, also can remain on this sheet material in the proper temperature scope.Depressing greatly under the rolling occasion, suitable temperature range is Ar 3Transformation temperature-Ar 3+ 50 ℃, under the occasion of implementing the controlled rolling method, be 700-800 ℃.
Curtain type cooling device not only is arranged on the outlet side of finish to gauge frame, also be arranged on the outlet side of many rolling mills of back segment, therefore, the heat that produces during rolling in the milling train of finish to gauge frame and front thereof is loose effectively and is kept proper temperature thus, simultaneously, rolled piece after rolling is cooled off strongly, has also brought into play the effect of preventing the grain growth of microscopic structure.In addition, this cooling device is the cooling way of the whole width of cooling water contact rolled piece, so, can on width, evenly cool off rolled piece in zero deflection ground.
Description of drawings
Fig. 1 is the configured in one piece that schematically illustrates according to the equipment of hot rolling A of a form of implementation of the present invention.
Fig. 2 A, 2B, 2C schematically illustrate the CVC function of milling train F1 in leading portion among the equipment of hot rolling A of Fig. 1 etc.
Fig. 3 be among the equipment of hot rolling A of presentation graphs 1 back segment milling train F4-F6 and near partial side view.
Fig. 4 (a) and (b) are illustrated near the upper surface of making steel plate and near each crystalline structure the lower surface.
Fig. 5 is the curve map that expression is relevant with the drive motors of each milling train F1-F6, produce the relation between the moment according to the rolling scaduled required moment of calculating and each drive motor of the rolling mill of correspondingly considering.
The specific embodiment
Hot continuous rolling device A shown in Figure 1 is a finishing mill, at the upstream side (not shown) heating furnace and roughing mill is arranged, and disposes runout table and coiling machine etc. at the downstream (not shown).This hot continuous rolling device A tandem is equipped with respectively and makes thick about 1 millimeter-6 millimeter hot rolled steel plate at upstream side through the steel plate (rolled piece) of roughing with the totally six rolling mill F1-F6 of roll and by continuous rolling.Constitute this equipment of hot rolling A as described below, wherein this equipment of hot rolling also can carry out the rolling thin brilliant hot rolled steel plate with trickle ferritic structure that promptly can produce of fine-grained steel by the setting condition of work when making general steel plate traditional rolling can finishing smoothly.
At first, three rolling mills as leading portion, tandem disposes so-called CVC milling train F1, F2 and F3, the CVC milling train F1 of the upstream in the leading portion is configured to the form of the four-high mill that is made of working roll 1a, 1b and backing roll 1c, 1d as illustrated in fig. 1, make working roll 1a, 1b have convexity (CVC, promptly so-called continuous variation convexity) shown in Fig. 2 A. Working roll 1a, 1b can be shown in Fig. 2 C axially move (displacement) upper and lower towards opposite simultaneously, and the position relation between thus can dancer rools promptly can be adjusted roll gap.The diameter of working roll 1a, 1b is 700 millimeters, and maximum amount of movement is ± 100 millimeters.In addition two CVC milling train F2, the F3 of leading portion also can be the same with the CVC milling train F1 of upstream in the leading portion aspect such 26S Proteasome Structure and Function.
CVC milling train F1, F2, the F3 that constitutes like this be disposed at be suitable for guaranteeing good steel plate P plate shape in the leading portion.In the reducing roller mill F4 of back segment described later, F5, F6, because the hot convexity that easy generation is caused by the processing heating when rolling fine-grained steel etc., so, by being configured in CVC milling train F1 in the leading portion, F2, F3 revision board shape and reduce cross-sectional constriction in the steel plate etc. in advance.
On working roll 1a, the 1b of CVC milling train F1, shown in Fig. 1 signal, connect respectively drive motors M1a, M1b (below, both are referred to as M1), on each working roll 1a, 1b of in addition two CVC milling train F2, the F3 of leading portion, equally also connect drive motors M2a, M2b (being referred to as M2) and M3a, M3b (being referred to as M3).Each motor M 1, M2, M3 are the ac motors of being furnished with speed Control mechanism, and they are connected with working roll 1a, the 1b of each milling train F1, F2, F3 with separately shaft coupling by the decelerator (not shown).
Then, as three rolling mills of back segment, still tandem disposes so-called reducing roller mill F4, F5, F6.The frame spacing that comprises above-mentioned CVC milling train F1, F2, F3 equals 5.5 meters.From CVC milling train F1 number is the form that the 4th reducing roller mill F4 is configured to the four-high mill that is made of working roll 4a4b and backing roll 4c, 4d as illustrated in fig. 1, and working roll 4a, 4b are the different as shown in figure rolls of diameter.And, the motor M 4 (ac motor of belt variable speed control mechanism) that is connected with universal coupling by the decelerator (not shown) drives the thicker bottom working roll 4b among working roll 4a, the 4b, and thinner top working roll 4a obtains driving force ground and freely do not rotate.On working roll 4a, 4b, be provided with roller mechanism (not shown), therefore, can make working roll 4a, 4b bending.And, when working roll 4a, 4b also have the CVC function, can make these two working rolls positive and negative moving in 100 millimeters scopes vertically.Because the diameter of working roll 4a is carefully to 480 millimeters, the diameter of working roll 4b is carefully to 600 millimeters, so both average equivalent rollers directly are 540 millimeters.Aspect above 26S Proteasome Structure and Function, in addition two reducing roller mill F5, the F6 of back segment are the same with above-mentioned reducing roller mill F4 also.On each working roll 4b of milling train F5, F6, be connected to drive motors M5, M6 separately.
Because these three reducing roller mill F4, F5, F6 of back segment are the little rolls in equivalent roller footpath and only drive one of them working roll 4b shearing force is acted on the steel plate P, so, even if rolling load is lower, also can implement the rolling of reduction ratio height (is 50% as reduction ratio).Therefore, under the little situation of rolling load, also can be used for fine-grained steel rolling depress greatly rolling etc., and this moment because rolling load is little, so, can both be avoided by the impropriety that roll flattening and edge attenuate cause.
Rolling in order to carry out fine-grained steel continuously, steel plate P must be sufficiently cooled and be remained in the proper temperature scope, therefore, in the back separately (downstream) of the back segment milling train F4 of hot continuous rolling device A, F5, F6 or separately front (upstream side) is equipped with as shown in Figure 1 curtain type cooling device 7 (symbol 7A-7H shown in Figure 3).Each cooling device 7 is such cooling ways, promptly becomes the heavy curtain shape to spray out a large amount of normal temperature cooling water (laminar flow water, for example the symbol f of Fig. 3) outwardly towards steel plate P is whole the spray head above or below being arranged on.Become the thickness (curtain is thick) of the cooling water of heavy curtain shape outflow to be necessary for more than 10 millimeters, consider from the cooling effect aspect, preferably 16 millimeter.The cooling water inflow of each cooling device 7 can the 100-500 of unit steel plate P width (every meter) cubic meter/hour scope in regulate, the steel plate P temperature that is caused by cooling reduces and carries out with the speed more than 20 ℃/second.In occasion of depressing rolling by example described later greatly etc., the cooling water that the applying unit width is 350 cubic metres/hour, the product that the steel plate P temperature of this moment is reduced in thickness of slab and speed reaches 60 ℃/second-80 ℃/second (comprising the temperature rising that the processing heating causes, about 40 ℃/second) when being 1200 millimeters mpm.
As shown in Figure 3, cooling device 7 is configured in the above and below of steel plate P, up, respectively in the front and back of the back of milling train F4 and milling train F5, cooling device 7A, 7B, 7D, 7E, 7G are set in the front and back of milling train F6, below, back at milling train F4, F5, F6 disposes cooling device 7C, 7F, 7H respectively, and cooling device 7H wherein is installed on the support of runout table T in the 6th rolling mill F6 back, and other cooling device 7A-7G is installed on the memorial archway H of each frame.
Because such cooling device 7 is used on three rolling mill F4 of back segment, each outlet side of F5, F6 etc., therefore, even if under the situation of depressing rolling and controlled rolling method greatly that is accompanied by the living heat of remarkable processing, also can be suppressed at temperature among each rolling mill F4, F5, the F6 rises and steel plate P is remained in the proper temperature scope, and, the phenomenon that the crystal grain that can suppress microscopic structure is grown up after rolling.In addition, be positioned on the above-mentioned output raceway (not shown) in downstream of equipment of hot rolling A, also prevent grain growth with water quench steel plate P.
In addition, in the hot finishing device A of Fig. 1,, to about one meter position, downstream, spray nozzle 8 is being set from the hundreds of millimeters of curtain type cooling device 7 (7G, 7H) at the outlet side of the milling train F6 that constitutes the finish to gauge frame.Described nozzle is used to remove by cooling device 7G, 7H and is applied to the lip-deep cooling water of steel plate P, and it is towards surface of steel plate geosyncline the place ahead inject high pressure water.If use such spray nozzle 8, then can successfully eliminate at the cooling water that loads under the effect of cooling device 7 on the steel plate P, therefore, can utilize various measuring instruments (thermometer etc., not shown) in its downstream suitably measure with rolling after the relevant various values (finishing temperature etc.) of steel plate P.
Utilize the hot continuous rolling device A that constitutes as described above, can speed quite fast and produce thin brilliant hot rolled steel plate with guaranteeing suitable productivity ratio.In the back segment frame strong, carry out the rolling of high reduction ratio by thin reducing roller mill F4, F5, F6, thereby can implement to depress greatly rolling or controlled rolling method the influence of metal structure.Can in milling train F4, F5, F6, avoid roll flattening and edge attenuate, and the CVC function of utilizing each rolling mill F4, F5, F6 is carried out the control of plate shape, thus one, even in the back segment of plate attenuation, also can suppress steel plate P crawl and plate shape is worsened, more than these advantages be to implement one of rolling reason of such fine-grained steel.
But, rolling for what in back segment, depress greatly as described above, the drive motors of back segment frame and especially downstream or near its drive motors M5h M6 of frame (milling train F5, F6 etc.) sufficiently high power (output, i.e. power, kilowatt) must be arranged.In depressing rolling occasion greatly, the rolling load of the steel plate P of unit width increases, the required roll torque of working roll 4a, 4b increases (but also increasing and decreasing required moment according to the relation with thickness of slab), meanwhile, owing to do not follow thickness of slab to improve mill speed with reducing, so, just need high power with the non-occasion ratio of depressing greatly.Can not produce enough roll torques if power of motor is not high enough, it is rolling to be difficult to that then the steel plate P that certain width is arranged is carried out fine-grained steel, and in addition, even if the enough height of moment and underpower, it is rolling enough to carry out fine-grained steel apace.
On the other hand, in the frame in the leading portion of rolling equipment A (milling train F1, F2, F3) because a little less than the influence to metal structure, thus depress greatly rolling not too meaningful, so, even if it is rolling to carry out fine-grained steel, do not depress rolling greatly yet.Therefore, their drive motors does not need to resemble back segment stand motor desired power.In other words, per two motor M 1a, the M1b of each rolling mill F1, F2, F3 (general designation M1); M2a, M2b (general designation M2); Power of motor P1, the P2 that M3a, M3b (general designation M3) add up, P3 are less than power P 4, P5, the P6 of each drive motors of back segment milling train F4, F5, F6.
Therefore, rolling about carrying out fine-grained steel, consider in the milling train of downstream, depress greatly rolling to metal structure with energy efficiency is favourable and according to the required power of rolling scaduled raising back segment shown in the embodiment 3 as described later, preferably set the power of the drive motors of each frame like this.Drive motors M4, the M5, the power P 4 of M6, P5, the P6 that are three rolling mills of back segment are set at P4＜P5≤P6, P4≤P5＜P6, perhaps P4＜P5＜P6 shown in following table 4 is given an example.Described power increases towards downstream direction, and the power p6 with motor M 6 of peak power wherein is that (P3) * 1.3, promptly it all exceeds more than 30% than any one power of motor P1, P2, the P3 of three rolling mills of leading portion p6 〉=Max for P1, P2.In addition, reduce the type of drive motors so that obtain the advantage of equipment cost and operating aspect, for example, in the example of following table 4, at P4＜P5≤P6, P4≤P5≤P6, perhaps P4＜P5＜P6 the time, P4 〉=Max (P1, P2, P3) * 1.15, in other words, arbitrary power of motor P1, P2, P3 in three rolling mills of the power ratio leading portion of each drive motors of three rolling mills of back segment exceed more than 15%.
Embodiment
Power configuration about the drive motors of each frame F1-F6 of rolling scaduled, this rolling equipment A of above-described hot continuous rolling device A below shows experimental example.
In the steel of chemical composition, utilize rolling equipment A to make thick 2.3 millimeters, wide 1200 millimeters steel plate with 0.16% carbon, 0.22% silicon, manganese (not containing other significant composition) of 0.82%.Mill speed is the same with the mill speed that common hot plate hoop mill is used always, is the 7-9 meter per second for example.
At first, suppose that example shown in Figure 1 is common rolling scaduled, it carries out common rolling so that obtain the ordinary hot rolled steel plate, rather than above-mentioned fine-grained steel, if accomplished, think that then the as shown in table 2 power configuration (tradition) relevant with the drive motors of each milling train F1-F6 is desirable.In table 1 (and table 3 described later) lining, " roll torque ", " rolling power " expression working roll 1a, 1b, 4a, the required value of 4b, " roughing passage " expression roughing mill, and " F1 "-" F6 " represents first to the 6th milling train F1-F6 separately.On the other hand, " Max moment " expression in the table 2 (and table 4 described later) makes the moment values that each motor produces in working roll 1a, the 1b of each rolling mill or 4a, 4b as the power output source.Obtaining thickness of slab is under the situation of the hot rolled steel plate below 2.0 millimeters, compares with the example of table 1, and the reduction ratio in milling train F2-F6 increases, required rolling power increases, and to obtain mill speed as described above, therefore, the power of motor of table 2 will have suitable surplus.
Table 1 common rolling scaduled (plate is wide 1200 millimeters)
The roughing passage F1 ?F2 ?F3 ?F4 ?F5 ?F6
Thickness of slab 36.0 18.7 ?10.3 ?6.4 ?4.0 ?2.9 ?2.3
The rolling load ton 2097 ?1611 ?1348 ?1157 ?1054 ?684
Roll torque ton * rice 145.7 ?71.8 ?40.9 ?28.2 ?17.0 ?6.9
Rolling power kilowatt 1698 ?1244 ?1128 ?1731 ?1693 ?1382
The rolling motor of using that table 2 is traditional
??F1 ??F2 ??F3 ??F4 ??F5 ??F6
Power kilowatt ??8400 ??10500 ??10500 ??8400 ??8400 ??6650
Max moment ton * rice ??225 ??221 ??138 ??61 ??41 ??28
On the other hand, not that to carry out above-mentioned ordinary hot rolled steel plate rolling, but when having based on the fine-grained steel of the microscopic structure of thin grained ferrite rolling, for example rolling scaduled according to table 3 depressed rolling in three rolling mills of back segment greatly.In the example of table 3, in finish to gauge frame F6 and preceding methods, rack F5 thereof, carry out reduction ratio and get the rolling of (strain is more than 0.5) more than 40%.According to rolling equipment A,,, just can obtain the thin brilliant hot rolled steel plate shown in Fig. 4 (a), 4 (b) thus with trickle ferritic structure Yi Bian carry out so rollingly Yi Bian utilize above-mentioned curtain type cooling device 7 (7A-7H) suitably to keep the temperature of steel plate P.
Table 3 fine-grained steel rolling scaduled (plate is wide 1200 millimeters)
The roughing passage F1 ?F2 ?F3 ?F4 ?F5 ?F6
Thickness of slab 40.0 28.8 ?19.7 ?12.3 ?7.5 ?4.5 ?2.3
The rolling load ton 2053 ?2160 ?2515 ?1995 ?2081 ?2158
Roll torque ton * rice 116.4 ?105.7 ?109.3 ?71.6 ?53.7 ?48.4
Rolling power kilowatt 1356 ?1832 ?3012 ?4396 ?5365 ?9640
But in table 3, compare with above-mentioned the rolling scaduled of table 1, the required roll torque of back segment increases, and also as shown in Figure 5, the motor torque (putting on the working roll and the moment that obtains the symbol in Fig. 5 ●) that has surpassed in table 2 the back segment milling train F4 that sets, F5, F6.Like this, the required roll torque of increase table 1 example is because increase rolling load so that depress greatly in back segment.In addition, the finish to gauge frame and near, be accompanied by by depressing the thickness of slab that causes greatly and sharply reduce and mill speed is improved fast, therefore, the required rolling power in milling train F5, F6 increases considerably in also than leading portion.
Therefore, under the power configuration condition that is considered to be applicable to common rolling table 2, concerning the motor M 4 of back segment milling train F4, F5, F6, M5, M6, it is not enough that moment that is produced or power (power) have become.Therefore, concerning motor M 1-M6 configuration also can carrying out the smoothly rolling power of fine-grained steel of giving rolling equipment A, suitable way is that for example good and sound table 4 makes back segment motor M 4, M5, M6 have high power.
The rolling motor of using of table 4 fine-grained steel
??F1 ??F2 ??F3 ??F4 ??F5 ??F6
Power kilowatt ??8400 ??10500 ??10500 ??11000 ??13000 ??14000
Max moment ton * rice ??225 ??221 ??138 ??80 ??63 ??58
In table 3,4, show in rolling (when depressing steel plate P) by power that motor M 1-M6 produced (power) and the moment of each frame F1-F6.Since steel plate P be not endless and because of rather than interruptedly be not rolled, so, as the motor of reality, be not necessarily to be configured to show the motor that intermediate value is the continuous rating value.Thereby, be preferably based on so-called square mean method etc., comprise that the table intermediate value obtains suitable rated value corresponding to rolling required time and operating frequency interiorly, and selected subsequently each motor M 1-M6.
Industrial applicibility
The present invention can be applicable to for the manufacture of having take the continous hot rolling facility of fine ferrite grain as the thin brilliant hot rolled steel plate of main microscopic structure.

Claims (9)

1, a kind of hot continuous rolling equipment, it comprises the leading portion with multi-set of rolling mill, the downstream and the back segment that have multi-set of rolling mill that is arranged on described leading portion on the rolled piece traffic direction, at least two rolling mills of described back segment are reducing roller mill or ultra-fine roller mill, at least two the described reducing roller mills or the described ultra-fine roller mill of described back segment are equipped with such drive motors respectively, and promptly the power ratio of these drive motors is arranged on the power height of drive motors of any rolling mill of described reducing roller mill or described ultra-fine roller mill upstream.
2, hot continuous rolling equipment as claimed in claim 1 is characterized in that, at least two rolling mills continuously that comprise the described back segment of finish to gauge frame are described reducing roller mill or described ultra-fine roller mill.
3, hot continuous rolling equipment as claimed in claim 1 or 2 is characterized in that, described back segment has at least three rolling mills, and two rolling mills wherein or three rolling mills are described reducing roller mill or described ultra-fine roller mill.
As the described hot continuous rolling equipment of one of claim 1-3, it is characterized in that 4, any milling train more than of described leading portion or described back segment has the CVC function.
5, as the described hot continuous rolling equipment of one of claim 1-4, it is characterized in that, the power of at least two the described reducing roller mills of described back segment or the described drive motors separately of described ultra-fine roller mill is configured to them and does not have all the same size, and the power of motor of the rolling-mill housing in its downstream is configured to be not less than the power of motor of the rolling-mill housing of its upstream.
6, hot continuous rolling equipment as claimed in claim 5, it is characterized in that, three rolling mills that comprise the described back segment of finish to gauge frame are described reducing roller mill or described ultra-fine roller mill, and the power that the power of the described drive motors separately of three reducing roller mills of this of described back segment or ultra-fine roller mill is decided to be the drive motors of this finish to gauge frame is P n, the drive motors power of the rolling-mill housing of its upstream is P N-1, the power of the drive motors of the rolling-mill housing of upstream is P again N-2, wherein, P n＞P N-1〉=P N-2, perhaps P n〉=P N-1＞P N-2
7, as claim 5 or 6 described hot continuous rolling equipment, it is characterized in that the power ratio of at least two the described reducing roller mills of described back segment or the described drive motors separately of described ultra-fine roller mill is high more than 15% at the power of the described drive motors of arbitrary rolling mill of the upstream of described reducing roller mill or described ultra-fine roller mill.
8, as the described hot continuous rolling equipment of one of claim 1-7, it is characterized in that the peak power at least two the described reducing roller mills at least of described back segment or the described drive motors power of described ultra-fine roller mill is higher more than 30% than the power of the described drive motors of the arbitrary rolling mill that is arranged on described reducing roller mill or described ultra-fine roller mill upstream.
9, as the described hot continuous rolling equipment of one of claim 1-8, it is characterized in that,, be provided with the curtain type cooling device that is used to cool off described rolled piece at least two the described reducing roller mills of described back segment or the outlet side separately of described ultra-fine roller mill.
CN02823926.1A 2001-08-03 2002-09-30 Continous hot rolling facility Pending CN1599648A (en)

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CN102821884A (en) * 2010-04-06 2012-12-12 住友金属工业株式会社 Operation control method of tandem rolling mill, and method for producing hot-rolled steel sheet using same
CN105234187A (en) * 2015-10-23 2016-01-13 首钢总公司 Hot continuous rolling plate shape control method for changing convexity distribution

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US5316802A (en) * 1992-02-20 1994-05-31 Nissin Electric Co., Ltd. Method of forming copper film on substrate

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JPS60141306A (en) * 1983-12-29 1985-07-26 Ishikawajima Harima Heavy Ind Co Ltd Continuous rolling installation
JPS62137102A (en) * 1985-12-09 1987-06-20 Nippon Steel Corp Production of hot rolled titanium sheet having good surface characteristic
JP2845097B2 (en) * 1993-03-18 1999-01-13 株式会社日立製作所 Hot steel plate rolling equipment and rolling method
JP2933923B1 (en) * 1998-09-08 1999-08-16 川崎重工業株式会社 Hot strip mill
JP3418738B2 (en) * 2001-03-16 2003-06-23 株式会社中山製鋼所 Hot rolling mill and method for producing fine-grained steel

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Publication number Priority date Publication date Assignee Title
CN102821884A (en) * 2010-04-06 2012-12-12 住友金属工业株式会社 Operation control method of tandem rolling mill, and method for producing hot-rolled steel sheet using same
CN102821884B (en) * 2010-04-06 2014-07-02 新日铁住金株式会社 Operation control method of tandem rolling mill, and method for producing hot-rolled steel sheet using same
CN105234187A (en) * 2015-10-23 2016-01-13 首钢总公司 Hot continuous rolling plate shape control method for changing convexity distribution
CN105234187B (en) * 2015-10-23 2017-07-18 首钢总公司 A kind of hot continuous rolling board-shape control method for changing convexity distribution

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