CN1473669A - Steel rolling mill and rolling method - Google Patents
Steel rolling mill and rolling method Download PDFInfo
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- CN1473669A CN1473669A CNA03142564XA CN03142564A CN1473669A CN 1473669 A CN1473669 A CN 1473669A CN A03142564X A CNA03142564X A CN A03142564XA CN 03142564 A CN03142564 A CN 03142564A CN 1473669 A CN1473669 A CN 1473669A
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Abstract
To provide a rolling mill and a rolling method by which a desired shape of a sheet is obtained in high response and cost reduction is attained by its compact structure. This mill is provided with work rolls for rolling a rolled stock, a coolant system for supplying a coolant at least on the inlet side of the rolled stock, a shape detector for measuring the shape of the sheet after rolling and a mechanical controlling means for controlling the shape of the sheet. The diameter of the work roll is taken as >= 0.16 to < 0.3 times the maximum width of the sheet which can be rolled. By installing coolant header trains on which a plurality of nozzles are arranged in the width direction of the sheet and a plurality of supply systems provided with means for respectively adjusting the flow rate and the temperature of the coolant in the coolant system, the rolling mill provided with a controller for controlling the mechanical controlling means and the coolant system on the basis of the detected value of the shape detector is realized. (C)2004,JPO.
Description
Technical field
The present invention relates to rolling mill and milling method.
Background technology
As the shape control method that the steel plate shape after rolling is formed desirable steel plate shape, measure shape after rolling with the SHAPE DETECTION device, machine control unit such as utilize the roll bending machine, move, simple shapes such as the crimping of correction rolling stock or middle elongation, in order to proofread and correct local elongation or the compound elongation that is difficult to proofread and correct, change is to the flow distribution of the cooling agent of work roll, makes the automatic control with the deviation minimum of target shape.The technology that distributes as the change coolant flow known to the public is opened flat 2-229612 number, spy the spy and is opened record to some extent on the flat 4-127909 communique.
On the one hand, when the extremely thin paper tinsel of rolled plate thickness, supply with on the work roll zone in the wide outside of oriented about plate high temperature cooling agent, proofread and correct the method for steel plate shape.Such technology is opened clear 60-180611 number, spy the spy and is opened record to some extent on flat 3-297507 number.
But in above-mentioned existing technology, has following problem, that is, because the yield rate that causes of change of shape delay of response is low, owing to increase the cooling agent total amount and enlarge The reconstruction scope and increase the running cost increase of introducing cost, causing owing to the temperature difference increase of giving cooling agent etc.
Summary of the invention
The purpose of this invention is to provide by height reaction and obtain desirable steel plate shape, and the rolling mill and the milling method that can reduce cost with mini-plant.
The diameter that makes working roll carries out machine control unit and cooling agent control according to detected steel plate shape in desirable scope.
Description of drawings
Fig. 1 represents the pie graph of 6 heavy rolling mills according to an embodiment of the invention.
Fig. 2 is the pie graph of expression coolant jet flow temperature adjustment device and cooling agent head row.
Fig. 3 is the figure that expression roll mean temperature changes.
Fig. 4 is the figure of expression thermal expansion of rollers quantitative changeization.
Fig. 5 is the figure of expression thermal expansion of rollers variable pitch.
Fig. 6 is expression work roll diameter Dw and the figure of the relation of the ratio of maximum steel plate width Bmax and shape reaction speed.
Fig. 7 is the figure of influence that expression involves the roller diameter of profile.
Fig. 8 is the figure that the flow temperature of the coolant supply system of expression 2 systems is adjusted embodiment and result thereof.
Fig. 9 is the figure of expression central roll diameter to the influence of the shape control ability of 6 heavy rolling mills.
Figure 10 is the figure that the flow temperature of the coolant supply system of expression 3 systems is adjusted embodiment and result thereof.
Figure 11 is the width curve of the various factors of the steel plate shape behind the expression influence of rolled.
Figure 12 is the variation of expression coolant jet flow temperature adjustment device and cooling agent head row.
Figure 13 is the layout of expression cooling agent head row.
Figure 14 is the figure that the flow temperature of the coolant supply system of expression 2 systems is adjusted embodiment and result thereof.
Figure 15 is the figure that the flow temperature of the coolant supply system of expression 2 systems is adjusted embodiment and result thereof.
Figure 16 is the figure that the flow temperature of the coolant supply system of expression 2 systems is adjusted embodiment and result thereof.
The specific embodiment
What Fig. 1 represented is a configuration example of rolling mill of the present invention.In Fig. 1, rolling mill have work roll 11 that direct contact rolling stock 14 is rolled, vertical direction support this work roll central roll 12, support the reinforcement roll 13 of this central roll 12 and detect the SHAPE DETECTION device 15 of rolling stock shape in vertical direction.
Be respectively equipped with the central roll mobile device 35 that makes bending force act on work roll bending apparatus 33 on work roll 11 and the central roll 12, central roll bending apparatus 34, on central roll 12, roll axially be moved.The action of this work roll bending apparatus 33, central roll bending apparatus 34, central roll mobile device 35 control of mobile controller 32 by bending.And crooked mobile controller 32 is subjected to the signal controlling from the mobile controlled quentity controlled variable calculation apparatus 31 of bending.
In addition, be provided with cooling agent head row 45a, 45b in this equipment,,, supply with cooling agent by the adjusting device 43 of adjusting flow and temperature independently to constituting each nozzle of cooling agent head row 45a, 45b to work roll 11 ejected coolant.Flow temperature adjustment device 43 is subjected to the control of cooling agent control device 42.And cooling agent control device 42 is subjected to the signal controlling from cooling agent controlled quentity controlled variable calculation apparatus 41.
In addition, crooked mobile controlled quentity controlled variable calculation apparatus 31 calculates the crooked controlled quentity controlled variable that moves according to the signal of shape correction calculation apparatus 21.And cooling agent controlled quentity controlled variable calculation apparatus 41 is subjected to the signal controlling of shape correction calculation apparatus 21.
What Fig. 2 represented is the configuration example of flow temperature adjustment device 43 and cooling agent head row 45a, 45b, be by from the coolant tank to the pump, the flow of control cooling agent on coolant flow adjuster 432a, 432b, the temperature of the last control of coolant temperature adjuster 433a, 433b cooling agent is by flow two coolant supply systems different with temperature, and constitute from the device 434 that two feed systems are optionally supplied with cooling agent.In addition, select on the feedway 434 at cooling agent, the cooling agent that also can stop two systems is supplied with.
With regard to the operation of the present embodiment of above formation and act on following (1) and in (5), describe.
(1) high response with regard to shape control effect describes.Utilize fluid to carry out heating or when cooling of solid, under the certain situation of the flow of external fluid and temperature, if the thermal capacity of this solid is big, the time that heating or cooling effect need from the superficial layer to the internal penetration is long, on the contrary, if the thermal capacity of object is little, can arrive inner by rapid permeability.Too, if roller diameter is big, thermal capacity is big when utilizing cooling agent heating or cold rolling roll, and embodying heating or cooling effect needs the time, if opposite diameter is little, thermal capacity is little, and heating or cooling effect can embody at short notice.But, no matter heat, cool off, when the distribution that changes the thermal expansion amount (temperature) of roll comes steel plate shape after the controlled rolling, its effect difference of different roller diameters.Present inventors are conceived to following understanding, promptly have in order to obtain the roller diameter that is suitable for of desirable steel plate shape control effect.Because in the above-mentioned existing technology, control for shape, do not consider any roller diameter about being suitable for, when being applied in existing technology on multi-form rolling mill or the different roller diameter, can not proofread and correct the steel plate shape corresponsively by height, make the longitudinal shape instability of steel plate, not only can not guarantee desirable steel plate shape, and cause decrease in yield.
Reaction describes with regard to the height in the embodiment of the present invention.What Fig. 3 represented is, when rolling rate when rolling and cooling condition (overall coolant flow rate) are identical, and the variation of the roll mean temperature that takes place owing to the difference of roller diameter.In addition, horizontal cooling is identical, through behind the certain hour, overall coolant flow rate is become 2 times.The heating exothermic equilibrium arrives the time of poised state, roller diameter greatly then the time long, the little then time of roller diameter lacks, the roller temperature under the poised state almost is identical value.Because the variation (flow is 2 times) of thereafter cooling condition, the time that begins to arrive in order next poised state from the little side of roller diameter lacks.Therefore, as can be seen because varying in size of work roll embodies the asynchronism(-nization) of cooling effect.
Following Fig. 4 is that the mean temperature with roll shown in Figure 3 is transformed into thermal expansion amount.Under the poised state, the mean temperature of roll is identical, therefore as can be seen with the proportional value of roller diameter, when roller diameter was big, thermal expansion amount was big, roller diameter hour, thermal expansion amount is little.The variable pitch (absolute value) that changes the thermal expansion amount of (flow is 2 times) along with thereafter cooling condition is, different because of diameter, gradient was mild when roller diameter was big, and roller diameter hour gradient is big.The variation and the roller diameter of the thermal expansion amount when arriving poised state are proportional, but the variable pitch (absolute value) after the firm variation of cooling condition is that the more little gradient of roller diameter is big more, can obtain high reaction.
What Fig. 5 represented is the thermal expansion of rollers variable pitch of each roller diameter, and as can be seen along with roller diameter diminishes, the thermal expansion variable pitch increases gradually, and roller diameter obviously increases in less than the field of 400mm.But in the steel plate shape control method that the thermal expansion that utilizes roll changes, different roller diameters, shape reaction speed (the change of shape amount [I-unit/sec] of unit interval) difference, in general, roller diameter is more little, the shape reaction speed is big more, and the steel plate shape of breakaway shape is had calibration capability fast, can improve the yield rate of vertical steel plate shape.
Fig. 6 is transverse axis with the diameter Dw of work roll and rolling possible the likening to of maximum steel plate width Bmax of this rolling mill, with shape reaction speed (the change of shape amount [I-unit/sec] of unit interval) as the longitudinal axis.In the design of various rolling mills (4 heavy, 6 heavily wait), when increasing rolling possible maximum steel plate width Bmax,, also strengthen the diameter Dw of work roll in order to ensure the rigidity of rolling mill, above-mentioned ratio is under situation about roughly keeping with the value of degree, selected roller diameter.At this moment, even above-mentioned ratio is certain haply, might be because the variation of work roll self, on thermal expansion of rollers variable pitch shown in Figure 5, produce difference, change along with rolling possible maximum steel plate width, the specification of roll cooling device also is changed (enhancing), and therefore, shape reaction speed shown in Figure 6 does not have illustrated such influence greatly with the relation of (the maximum steel plate width Bmax of roller diameter Dw/) ratio.From the graph of a relation of above-mentioned shape reaction speed of putting in order out and (the maximum steel plate width Bmax of roller diameter Dw/) ratio, the ratio of work roll diameter Dw and maximum steel plate width Bmax was less than 0.3 o'clock, can guarantee that the shape reaction speed is 0.1[I-unit/sec], compare with the state that above-mentioned ratio is bigger, can guarantee higher reactivity, obtain shape control effect.
On the one hand, along with (the maximum steel plate width Bmax of roller diameter Dw/) than dwindling, produced the bending of horizontal direction on work roll, the external force that becomes in the control of steel plate shape is disturbed.In order to suppress this horizontal curvature, the support roll that is arranged on horizontal direction support performance roll is absolutely necessary, but because the support roll is set, the collision of cooling agent breaker roll face is hindered, and utilizes the roll cooling to be difficult to control accurately the steel plate shape.The lower limit of (the roller diameter Dw/ maximum steel plate width Bmax) ratio that do not need the lower limit of such support roll, negligible horizontal direction bending to derive from structural environment, this value is more than 0.16.
In the above-described embodiment, shape reaction speed when having investigated changes in flow rate with the roll cooling agent and being 2 times and the relation of (the maximum steel plate width Bmax of roller diameter Dw/) ratio define the scope of (the maximum steel plate width Bmax of the roller diameter Dw/) ratio that can access better effect.Certainly, if flow increases by three times, four times, Fig. 3 extremely value of the longitudinal axis shown in Figure 6 changes, can obtain higher reactivity, utilize the steel plate shape control ability of roll cooling agent also to increase to some extent, but the trend of curve shown in Figure 6 does not almost change, and the limited range of (the maximum steel plate width Bmax of roller diameter Dw/) ratio is constant.
This basic principle is shown in newton's the cooling rule (publish in gloomy north, heat transfer engineering P31), to the heat transfer of the fluid of solid wall surface with Q=hS Δ θ (formula 1) expression.At this, Q is that the heat, the h that move in the unit interval are that heat transfer coefficient, S are that surface area, Δ θ are the temperature differences of solid wall surface and fluid.If this principle is used for roller milling roller and roll cooling agent, the factorial of heat transfer coefficient h and coolant flow (0.5～0.6) is roughly proportional as can be seen, by increasing the flow of fluid, can increase this cooling capacity, the heat that moves from roll crown also with the proportional increase of heat transfer coefficient h.
Equally, because the temperature of roll cooling agent reduces, the temperature difference Δ θ of above-mentioned formula increases, the heat that moves from roll crown also with the proportional increase of heat transfer coefficient h, utilize the steel plate shape control ability of roll cooling agent also to increase, but identical when increasing with the flow of roll cooling agent, the trend of curve shown in Figure 6 is roughly constant, and the limited range of (the maximum steel plate width Bmax of roller diameter Dw/) ratio is constant.
In addition, opposite during with cooling by improving the temperature of roll cooling agent, can move heat to roll crown from cooling agent.Improve the temperature of roll cooling agent this moment similarly,, can increase the heat that moves to roll crown by increasing the absolute value of temperature difference Δ θ.Even in this case, because basic principle is constant, the trend of curve shown in Figure 6 is roughly constant, and the limited range of (the maximum steel plate width Bmax of roller diameter Dw/) ratio is constant.
By above content, when utilizing the thermal expansion amount of the flow of roll cooling agent or temperature control work roll, guarantee higher reactivity, (the maximum steel plate width Bmax of roller diameter Dw/) that can obtain shape control effect compares the scope of in 0.16≤Dw/Bmax＜0.3 (formula 2).
(2) just reducing the introduction running cost describes.The spy who utilize to change the flow distribution of cooling agent opens flat 2-229612 number, spy and opens the well-known technology of being put down in writing on the flat 4-127909 communique, when solving the low problem of the yield rate cause owing to the change of shape delay of response, the total flow that increase roll cooling agent be can easily infer, thereby roll width direction and local cooling capacity improved.But be accompanied by the transformation that overall coolant flow rate increases, be not only feed system, and comprise the equipment such as filter, recovery channel of the subsidiary recovery system of the cooling agent of design in the early stage, cause cost to increase.In addition, even under the situation about resetting, because the different cooling effect differences of the roller diameter that is suitable for when roller diameter is big, in order to obtain desirable steel plate shape control effect, need very many flows.Roller diameter hour in addition, owing to be provided with the support roll of control roll horizontal direction bending, the collision of roll cooling agent breaker roll face is hindered, and produces the problem that can not get desirable cooling effect.
In the present embodiment, (the maximum steel plate width Bmax of roller diameter Dw/) of regulation is more than the twice of extraneous shape reaction speed than the shape reaction speed of scope substantially in the formula 2.Therefore, if improve extraneous shape reaction speed, heat transfer coefficient need be guaranteed the degree of about twice.As previously mentioned, because the factorial (0.5～0.6) of heat transfer coefficient h and flow is roughly proportional,, need three times to four times flow therefore as flow.If necessary flow is three times to four times, needs the cooling agent supply pump thereupon, supplies with recovery channel diameter, heat exchanger, filter, jar maximization, and the cost during introduction is very big, is not good method.
(the maximum steel plate width Bmax of roller diameter Dw/) of regulation compares outward with scope than scope in the formula 2, same steel plate width, and the work roll diameter is little, also helps the miniaturization of rolling mill integral body, and the effect that reduces rolling mill body cost is arranged.
In addition, even when giving the cooling heating that temperature difference Δ θ carries out work roll, if analogize from formula (1), (the maximum steel plate width Bmax of roller diameter Dw/) that limits in the formula 2 differs twice than the temperature difference Δ θ of scope and extraneous necessity, will be related to the heating of carrying out cooling agent, cooling heat exchanger heat transfer area maximization and as the introduction of enhancing ability and the increase of running cost.And, because the difference of cooling agent kind has the deterioration of high low-temperature region lubricity and in high-temperature area danger on fire, may be unfavorable for operation.According to the present invention, it is existing about 1/2 making temperature difference Δ θ, just can give full play to shape control effect, therefore can reduce running cost.
In addition, because in the existing technology, do not consider work roll diameter, rolling mill form and roller diameter ratio, exist following problem, promptly with the steel plate width ratio, the work roll diameter is bigger, for 4 sections rolling mills can not controlling compound shapes such as M type and W type, in order to obtain desirable shape control effect, need very many flows, do not reach desirable ability with the combination that utilizes cooling agent to carry out shape control effect, but in the present embodiment, can obtain appropriate control ability with appropriate flow.
In addition, during the well-known technology that utilize to change that spy that coolant temperature distributes opens that clear 60-180611 communique, spy open that flat 3-297507 communique put down in writing, infer that easily the temperature difference of the roll cooling agent of sening as an envoy to increases heating efficiency.But the temperature difference that increases cooling agent causes the increase of consumption cost of energy when operating.When using oily stoste as cooling agent, cause the viewpoint of fire for preventing because the temperature of oil rises, the oil that can not at will raise is warm.And, when use is emulsified in emulsion in the water with the oil of a few percent, though compare the danger of fire has reduced with stoste, but in case break away from the stable emulsifying zone of emulsion, water-oil separating is accelerated, produce cooling performance and greasy property instability, rolling problem of unstable can address this problem in the present embodiment.
(3) just the combination of utilization and machine control unit raising shape control ability describes.As mentioned above, in order to ensure higher reactivity, clear and definite (the maximum steel plate width Bmax of roller diameter Dw/) that obtains shape control effect compares scope, but in the steel plate rolling of reality, if 4 heavy rolling mills, utilize and the work roll bending force, if 6 heavy rolling mills, the control of steel plate shape is carried out in the combination of the machine control unit that utilization and work roll and central roll bending force are such.At this, at first the thermal expansion of rollers curve when rolling since different roller diameters have which type of difference and investigate.
Fig. 7 represents is in the thermal expansion of rollers quantitative change curve shown in Figure 4, through the roller curve after 60 minutes.Along with roller diameter dwindles, to the steel plate end, move to the steel plate end lateral attitude that roller curve gradient trend changes from the steel plate central part.Utilize roll cooling or heating to make in the reactive high roller diameter scope of shape, because roller curve has near the tendency jumpy steel plate end, be necessary like this studying again with the combination of machine control unit.
In general, as the distortion that the steel plate shape after rolling is had the work roll of big influence, the bending, the surface that have thermal expansion curve, rolling load to produce are flat, and under cold rolling such steel-sheet situation, big governing factor is thermal expansion curve and bending.The surface is flat to be compared with the thermal expansion curve, because the deviation in the steel plate width is little, also it doesn't matter even therefore ignore.Figure 11 (a) plucks that to have selected work roll diameter shown in Figure 7 be the thermal expansion of rollers of Φ 340mm, the thermal expansion curve in steel plate width only, and transverse axis is steel plate width direction position h, is example with the situation of steel plate width 1250mm.That Figure 11 (b) represents is the crooked P δ of roll that rolling load P produces.Therefore, be necessary by machine control unit and utilize the thermal expansion curvilinear motion of roll cooling agent, control the overlapping Figure 11 (a) and (b) curve of curve.
Consider that 4 heavy rolling mills are when (being called the 4Hi rolling mill), as machine control unit, representational is the work roll bending apparatus, and the influence of the crooked WR δ of work roll bending apparatus breaker roll is shown in Figure 11 (c), and its control range is limited near the steel plate end (beyond the steel plate width 2/3).Therefore, utilize the crooked control of work roll as Figure 11 (b) shown in, resemble the crooked P δ of roll that rolling load produces, near the steel plate width center smoothly the bending of variation be difficult, must utilize the roll cooling agent to control this bending.But the crooked P δ of the roll that rolling load produces is very large, for the thermal expansion amount that utilizes the roll cooling agent changes it is controlled, and must introduce the cooling agent equipment that possesses unreality heating cooling capacity.
On the one hand, use is had both has 6 of central roll bending apparatus to weigh rolling mills when (being called the 6HiUC rolling mill), the crooked WR δ of the crooked roll that produces of central roll is shown in Figure 11 (d), the control characteristic of central roll bending apparatus is, can control near the bending that changes smoothly from the steel plate width center, the crooked P δ of the roll that the rolling load shown in Figure 11 (b) produces.Therefore, compare, not only alleviated the burden of the equipment that imposes on the roll cooling agent, can also share function according to the control characteristic of different shape control device with the 4Hi rolling mill.It is near the steel plate shape the work roll bending apparatus control steel plate end, the control of central roll bending apparatus roughly is near the steel plate shape the steel plate width center, and the roll cooling agent is used for proofreading and correct the local shape with work roll and central roll bending apparatus control difficulty.
Below, it is identical with the injection conditions of roll cooling agent to establish work roll, relatively the control ability of 4Hi rolling mill and 6HiUC rolling mill.
Fig. 8 relatively sprays under the situation of same cooling agent the calibration result of steel plate shape.
Dotted line among the figure is the A-stage before beginning to control, and the elongate sides of steel plate shape and the deviation of support-side approximately are 160[I-unit] (100[I-unit] to+60[I-unit]).The 4Hi rolling mill is at 110[I-unit] (70[I-unit] to+40[I-unit]) in, the 6HiUC rolling mill is at 60[I-unit] (40[I-unit] to+20[I-unit]) in, can make the planarization of steel plate shape.The 4Hi rolling mill can not obtain sufficient control ability owing to lack mechanical control ability as can be seen as previously mentioned.The deviation that requires in the practical operation approximately is 20[I-unit] (10[I-unit] to+10[I-unit]), so even the 6HiUC rolling mill also is inadequate.
Following Figure 14 is that expression will produce the steel plate shape and extend the roll cooling agent at position and be increased to result after 2 times.The 4Hi rolling mill is at 80[I-unit] in (50[I-unit] to+30[I-unit]), the 6HiUC rolling mill is at 20[I-unit] in (10[I-unit] to+10[I-unit]), deviation that can reduced width direction steel plate shape.
What Figure 15 represented is will produce the roll cooling agent at steel plate shape elongation position than reducing by 10 ℃ result on every side.The 4Hi rolling mill is at 70[I-unit] in (45[I-unit] to+25[I-unit]), the 6HiUC rolling mill is at 15[I-unit] in (10[I-unit] to+5[I-unit]), deviation that can reduced width direction steel plate shape.
What Figure 16 represented is with the result of the roll cooling agent outside the steel plate end of generation steel plate shape support than 20 ℃ of risings in the steel plate width.The 4Hi rolling mill is at 50[I-unit] in (20[I-unit] to+30[I-unit]), the 6HiUC rolling mill is at 15[I-unit] in (5[I-unit] to+10[I-unit]), deviation that can reduced width direction steel plate shape.
Under any situation, the 6HiUC rolling mill can use the thermal expansion amount that utilizes the roll cooling agent to change by Min. ground, reach desired deviation in the practical operation, approximately be 20[I-unit] (10[I-unit] to+10[I-unit]), by combined with the such machine control unit of work roll bending apparatus, central roll bending apparatus, obtain effect of sufficient, can reach roughly is the effect of 4 times in 4Hi rolling mill.
In general, when using the 6HiUC rolling mill,, be necessary to make the central roll diameter, the flexural property that the difference bending force forms and the flexural property of work roll greater than the work roll diameter in order to control near the bending that changes smoothly from the steel plate center.When the diameter of work roll and central roll was almost equal, flexural property did not almost have difference, and the effect that obtains mainly is to remove harmful contact site that central roll moves generation.Therefore, in order to control near the bending the steel plate width center, be necessary to study the ratio of central roll diameter and work roll diameter.
Fig. 9 (a) expression be that the work roll diameter is Φ 340, the central roll diameter steel plate shape control effect when being respectively Φ 340, Φ 380, Φ 440.Along with the ratio of central roll diameter Di and work roll diameter Dw near 1, this control range narrows down, very difficult near the control steel plate width center, the calibration result of steel plate shape is also little.Fig. 9 (b) establishes (central roll diameter Di and work roll diameter Dw) than for transverse axis, is the longitudinal axis to the relative value of the shape control ability of 4Hi rolling mill, investigates various roller diameter ratios.Roller diameter is than the scope that surpasses 1.2 as can be seen, and this ability improves obviously, has the ability more than 4 times.Therefore, 6 heavy rolling mills with work roll bending apparatus, central roll bending apparatus, central roll locomotive function are combined with the shape control apparatus that utilizes the roll cooling, during control steel plate shape, preferably be suitable for central roll diameter Di and surpass work roll diameter Dw1.2 scope doubly.
(4) describe with regard to utilizing from the selection supply raising shape control ability of 3 system temperatures.In addition, by the enforcement of combination Figure 15, Figure 16, can obtain desired shapes control effect more.Figure 10 is the embodiment under the following situation, supplies with 60 ℃ the cooling agent that is higher than the roll crown temperature to the outside of steel plate end, and the cooling agent of low temperature is supplied with at the position that produces elongation in steel plate width.At this moment, by utilizing cooling agent to select feedway 434, from 3 system temperatures, to select to supply with cooling agent, the total amount of cooling agent is constant, do not need to transform pump, recovery system, filter, jar etc., only feed system is changed over Fig. 2 or structure shown in Figure 10 gets final product.
Like this, by utilizing the work roll bending apparatus and supplying with high temperature coolant and proofread and correct near the steel plate end support shape, utilize the central roll bending apparatus to proofread and correct the big shape of steel plate integral body, utilize cryogenic coolant to proofread and correct the interior local elongation shape of steel plate width, can be corrected into smooth haply steel plate shape as shown in the figure.
(5) variation with regard to the cooling agent head configuration describes.Figure 12 is the variation of flow temperature adjustment device 43 and cooling agent head row 45a, 45b shown in Figure 2, both differences be cooling agent select feedway 434 be about (434a, 434b) separate.Taking cost into account, shared benefit up and down as shown in Figure 2 is to reduce the part number.But cooling agent selects feedway about in the of 434 when shared, owing to select feedway 434 to be arranged on the top or the bottom of rolling mill, the duct length that arrives cooling agent head row 45a, 45b is different up and down sometimes, after switching manipulation was finished, it was poor to produce speed on the time that in fact nozzle tip changes flow or temperature.In order not produce such time difference, make cooling agent select feedway 434 to separate up and down, the duct length that arrives cooling agent head row 45a, 45b is arranged on the shortest position.
Figure 13 (a) is an application examples, at input side, will be to two pairs of cooling agent head row 451a, 451b, 452a, the 452b upper and lower settings of work roll ejected coolant, and can be when a pair of nozzle, under the little situation of the projected area of cooling agent, guarantee projected area.
Figure 13 (b), Figure 13 (c) utilize original cooling agent feedway, use the embodiment when of the present invention.Original cooling agent supply arrangement 45c shown in Figure 13 (b), be to supply with cooling agent with same flow, temperature to width in the input and output both sides of rolling stock, the main purpose of supplying with is to carry out lubricating between roll and the rolling stock in input one side, remains in the iron powder and the unglazed powder of surface of steel plate in the outlet side flushing.At this, nozzle head 451a, the 451b by setting up or transform input side of the present invention and nozzle head 452a, the 452b of outlet side, the thermal expansion amount of control roll carries out the control of steel plate shape.
Figure 13 (c) keeps original cooling agent supply arrangement at input side, uses the situation of cooling agent head row 45a of the present invention, 45b at outlet side.In general the roller surface after just rolling is a high temperature, if cooled off before conducting heat to radial direction, cooling effect improves.Outlet side at rolling stock is used the present invention, also can improve the shape control effect of steel plate.
According to the present invention, obtain desirable steel plate shape with high reaction, and rolling mill and the milling method that utilizes mini-plant to reduce cost can be provided.
Claims (8)
1. rolling mill, have: the work roll of rolling steel rolling material, supply with the coolant apparatus of cooling agent, the SHAPE DETECTION device of measuring the steel plate shape after rolling and the machine control unit of control steel plate shape at the input side of steel rolling material at least, it is characterized in that
The diameter of aforementioned work roll is 0.3 times of rolling possible more than 0.16 times of steel plate Breadth Maximum, a less than,
In aforementioned coolant apparatus, be arranged on a plurality of feed systems that the steel plate width direction disposes the cooling agent head row of a plurality of nozzles and has the device of adjusting coolant flow and temperature respectively,
Have detected value, control the control device of this machine control unit and this coolant apparatus according to the aforementioned shapes detector.
2. rolling mill, have: a pair of up and down work roll, central roll, reinforcement roll, and the bending apparatus of axial mobile device, work roll and the central roll of central roll, and at least the input side of rolling stock supply with cooling agent coolant apparatus, and measure the steel plate shape after rolling the SHAPE DETECTION device, and the aforementioned central roll of control moves, the device of the action of work roll bending, central roll bending apparatus and cooling agent feedway, it is characterized in that
The diameter of aforementioned work roll is 0.3 times of rolling possible more than 0.16 times of steel plate Breadth Maximum, a less than,
Aforementioned cooling agent feedway has: dispose a pair of at least up and down above cooling agent head row of a plurality of nozzles, the horizontal measuring interval of steel plate of this nozzle correspondence aforementioned shapes detector in the steel plate width direction; And have a plurality of feed systems of the device of adjusting coolant flow or temperature respectively;
Aforementioned central roll moves, work roll bending, central roll bending control device and cooling agent control device, has based on the output signal of aforementioned SHAPE DETECTION device and the deviation of target shape, the device that each controlled quentity controlled variable is handled in calculation; And aforementioned cooling agent control device has the cooling agent of selecting 1 system from aforementioned a plurality of coolant supply systems, the device of supplying with each nozzle of aforementioned cooling agent head row.
3. rolling mill as claimed in claim 2 is characterized in that, the diameter of aforementioned central roll surpasses 1.2 times of aforementioned work roll diameter.
4. rolling mill as claimed in claim 2, it is characterized in that, aforementioned cooling agent feedway has: a pair of at least up and down cooling agent head that disposes a plurality of nozzles in the steel plate width direction is listed as, the horizontal measuring interval of steel plate of the corresponding aforementioned shapes detector of this nozzle; And having two feed systems of the device of adjusting coolant flow respectively, it is many that the flow of each nozzle of flow-rate ratio the 1st feed system of each nozzle of the 2nd feed system is wanted.
5. rolling mill as claimed in claim 2, it is characterized in that, aforementioned cooling agent feedway has: a pair of at least up and down cooling agent head that disposes a plurality of nozzles in the steel plate width direction is listed as, the horizontal measuring interval of steel plate of the corresponding aforementioned shapes detector of this nozzle; And having two feed systems of the device of adjusting coolant temperature respectively, the temperature of the 2nd feed system is lower than the temperature of the 1st feed system.
6. rolling mill as claimed in claim 2, it is characterized in that, aforementioned cooling agent feedway has: a pair of at least up and down cooling agent head that disposes a plurality of nozzles in the steel plate width direction is listed as, the horizontal measuring interval of steel plate of the corresponding aforementioned shapes detector of this nozzle; And have three feed systems of the device of adjusting coolant temperature respectively, and the temperature of the 2nd feed system is lower than the temperature of the 1st feed system, and the temperature of the 3rd feed system is than the temperature height of the 1st feed system.
7. the milling method of a rolling mill, this rolling mill has: the work roll of rolling steel rolling material, supply with the coolant apparatus of cooling agent, the SHAPE DETECTION device of measuring the steel plate shape after rolling and the machine control unit of control steel plate shape at the input side of steel rolling material at least, the diameter of aforementioned work roll is 0.3 times of rolling possible more than 0.16 times of steel plate Breadth Maximum, a less than, it is characterized in that
In aforementioned coolant apparatus, when adjusting the flow of this cooling agent and temperature respectively, from a plurality of feed systems, dispose the cooling agent head row of a plurality of nozzles to the steel plate width direction and supply with cooling agent,
By this machine control unit and this coolant apparatus, according to the detected value of aforementioned shapes detector, control steel plate shape.
8. control device that rolling mill is used, this rolling mill has: supply with the coolant apparatus of cooling agent, the SHAPE DETECTION device of measuring the steel plate shape after rolling and the machine control unit of control steel plate shape at least in the input of steel rolling material, the diameter of the work roll of rolling steel rolling material is 0.3 times of rolling possible more than 0.16 times of steel plate Breadth Maximum, a less than, it is characterized in that
Aforementioned coolant apparatus, have when adjusting this coolant flow and temperature respectively, from a plurality of feed systems, be provided with the device of the cooling agent head row supply cooling agent of nozzle to the steel plate width direction, by this machine control unit and this coolant apparatus, according to the detected value of aforementioned shapes detector, control steel plate shape.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002230745A JP3622743B2 (en) | 2002-08-08 | 2002-08-08 | Rolling mill and rolling method |
| JP230745/2002 | 2002-08-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1473669A true CN1473669A (en) | 2004-02-11 |
| CN1221338C CN1221338C (en) | 2005-10-05 |
Family
ID=31492341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03142564 Expired - Lifetime CN1221338C (en) | 2002-08-08 | 2003-06-10 | Steel rolling mill and rolling method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3622743B2 (en) |
| CN (1) | CN1221338C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100404153C (en) * | 2005-04-11 | 2008-07-23 | 株式会社日立制作所 | Roll shape controlling means and control device |
| CN101356020B (en) * | 2006-10-21 | 2011-03-09 | Sms西马格股份公司 | Device for measuring the tension in a metallic strip |
| CN108296293A (en) * | 2018-04-09 | 2018-07-20 | 常州市亿和铝合金焊材有限公司 | A kind of cooling system of rolled aluminium alloy bar three-high mill |
| TWI749347B (en) * | 2019-07-03 | 2021-12-11 | 日商東芝三菱電機產業系統股份有限公司 | Rolling shape control apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2466458B (en) | 2008-12-19 | 2011-02-16 | Siemens Vai Metals Tech Ltd | Rolling mill temperature control |
| JP5419648B2 (en) * | 2009-11-17 | 2014-02-19 | 株式会社神戸製鋼所 | Shape control method in kiss rolling |
| CN103143570B (en) * | 2013-04-03 | 2015-06-10 | 中冶东方工程技术有限公司 | Roller cooling system and cooling control method thereof |
| CN104289526B (en) * | 2014-09-19 | 2016-03-09 | 浙江龙盛薄板有限公司 | The cold milling wet leveling control method of single chassis reversable mill and cold rolling control system thereof |
| CN104841704B (en) * | 2015-04-14 | 2017-01-04 | 莱芜钢铁集团电子有限公司 | A kind of chiller |
| CA2998379C (en) | 2015-09-21 | 2020-01-21 | Novelis Inc. | Pre-heating and thermal control of work rolls in metal rolling processes and control systems thereof |
| CN105234185B (en) * | 2015-10-29 | 2017-03-29 | 燕山大学 | Suitable for leveling precision difference in flow opposite sex Optimal Setting method the wet jetting piles operation of rolling |
-
2002
- 2002-08-08 JP JP2002230745A patent/JP3622743B2/en not_active Expired - Lifetime
-
2003
- 2003-06-10 CN CN 03142564 patent/CN1221338C/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100404153C (en) * | 2005-04-11 | 2008-07-23 | 株式会社日立制作所 | Roll shape controlling means and control device |
| CN101356020B (en) * | 2006-10-21 | 2011-03-09 | Sms西马格股份公司 | Device for measuring the tension in a metallic strip |
| CN108296293A (en) * | 2018-04-09 | 2018-07-20 | 常州市亿和铝合金焊材有限公司 | A kind of cooling system of rolled aluminium alloy bar three-high mill |
| TWI749347B (en) * | 2019-07-03 | 2021-12-11 | 日商東芝三菱電機產業系統股份有限公司 | Rolling shape control apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1221338C (en) | 2005-10-05 |
| JP2004066310A (en) | 2004-03-04 |
| JP3622743B2 (en) | 2005-02-23 |
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