CN1277568A - Sheet hot rolling mill - Google Patents
Sheet hot rolling mill Download PDFInfo
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- CN1277568A CN1277568A CN99801542A CN99801542A CN1277568A CN 1277568 A CN1277568 A CN 1277568A CN 99801542 A CN99801542 A CN 99801542A CN 99801542 A CN99801542 A CN 99801542A CN 1277568 A CN1277568 A CN 1277568A
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- 238000005098 hot rolling Methods 0.000 title claims abstract description 67
- 239000000463 material Substances 0.000 claims description 79
- 238000003801 milling Methods 0.000 claims description 73
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 abstract description 33
- 239000002184 metal Substances 0.000 description 17
- 230000000747 cardiac effect Effects 0.000 description 15
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000013000 roll bending Methods 0.000 description 3
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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Classifications
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- 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
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- 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
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
- B21B13/023—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally the axis of the rolls being other than perpendicular to the direction of movement of the product, e.g. cross-rolling
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2269/00—Roll bending or shifting
- B21B2269/12—Axial shifting the rolls
- B21B2269/14—Work rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2273/00—Path parameters
- B21B2273/12—End of product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
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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
- B21B45/004—Heating the product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
A sheet hot rolling mill, wherein its finishing rolling mill (30) is divided into front and rear stages (31 and 32), and CVC mills (31A and 31B) of two stands or more are disposed on the front stage (31) and different diameter roll mills (32A and 32B) of two stands or more are disposed on the rear stage (32), whereby, when a thin sheet about 1.2 mm thick or thinner is rolled, a crown or edge drop is suppressed from occurring and also a drawing is prevented from occurring at the tail end part of the sheet so that a rolled sheet can be manufactured smoothly.
Description
The present invention relates to a kind of sheet hot rolling mill that can produce the uniform sheet material of thickness (steel plate) reposefully.
When producing thin plate, importantly make the end section of sheet billet pass every rolling mill reposefully and form the uniform sheet material of thickness by hot rolling.When with roll rolled sheet metal base, because the middle cardiac prominence of plate is thick and edge thinning to make that sheet billet is rolled in uneven thickness, wherein the thick meeting of the middle cardiac prominence of plate increases the thickness of the mid portion of sheet material broad ways, and edge thinning can make the thickness of sheet material lateral section sharply reduce.When rolled sheet metal, be easy to produce and be called as the defective of creasing, that is, it is rolling that the end section of sheet material is folded ground.In cardiac prominence thick be the sheet metal thickness that causes of the bending owing to roll on width from the increase of side to the centre.Edge thinning is owing to be formed at roll working portion that sheet material is exerted pressure respectively and the boundary of the roll inoperative part (corresponding to the roll part in the space outside the sheet edge) of sheet material not being exerted pressure and thickness with caused sheet material lateral section of roll shoulder of circular shape sharply reduce with the inclined-plane of bending.Crease and be meant the end section of the folding unsettled sheet billet that becomes when tension force does not act on the sheet billet between the milling train.Folding is to have entered in the milling train owing to unsettled end section strikes that take place on flipper guide or the analog and folding end section.If the center convex thick part divide or crease, will reduce the precision of sheet material.If crease, then can damage roll and need breaker roll to carry out grinding, and therefore output be descended greatly.
When sheet material is thin, easier creasing.When reducing the thickness of sheet billet, sheet billet is rolled with heavy reduction, applies a very high roll-force on sheet billet, and has therefore increased the power that sheet billet is laterally moved.If sheet billet bumps against on the guide plate or analog that is configured in the milling train front, then the end section of sheet billet is bent easily.Therefore, can be by the following 1.2mm that is limited to of the rolling steel plate thickness of hot rolling mill.
At " the endless rolling outline among (280) Chiba 3HOT (Overview of endlessrolling on Chiba 3 HOT) ", CAMP-ISIJ, disclose among volume 10 (1997)-1088 and the JP-A6-106207 and be used for hot rolling thickness stably about 1.2mm or following steel plate and the preventing technology of creasing.Disclosed technology related to before the end section of last sheet billet enters finishing mill in these public publications, the front end of subsequently sheet billet was connected on the tail end of last sheet billet, to reduce the quantity of no tension force end section.Inevitable end section is to be rolled under 1.6mm or the above state at thickness, creases avoiding.
Utilize in the above-mentioned public publication the disclosed cost of producing the required equipment of thin plate to compare quite high with traditional hot rolling mill consistently, because this kind equipment needs one to be used for the special jockey that at short notice sheet billet linked together, and must change the overall arrangement of hot rolling line.Therefore, must do great change to traditional hot rolling mill in order to implement aforementioned techniques.Improvement need spend long time, and must stagnate production for a long time.Although aforementioned means can prevent to crease, the thick and edge thinning of cardiac prominence in the sheet material that it is difficult to suppress to be caused by aforementioned means.
An object of the present invention is to provide the thick and edge thinning of a kind of middle cardiac prominence that can suppress sheet material and can prevent the plate hot rolling rolling machine system simple in structure that creasing appears in the end section at sheet billet.
Sheet hot rolling mill of the present invention has a finishing mill, and this finishing mill is made up of a leading portion and a back segment, wherein,
1. leading portion comprises two or two above CVC milling trains or roller group staggered form (pair-cross) milling train, and
2. the rear end comprises not cotype milling train of two or two above roller diameters.
1. the CVC milling train in is a kind of known milling train, and it comprises having overall diameter and the axially movable roll (CVC roll) that changes vertically.Roller group staggered form milling train is a kind of known milling train, it comprises a pair of roller group that is respectively arranged with working roll and backing roll, two roller groups are provided with mutually with being not parallel to each other, cross one another, the mid portion of working roll is the most approaching mutually in two groups, and the relation of the position between two groups (angles between two groups) can change.In these milling trains, the shape of roll gap can change.In the CVC milling train, can change roll gap, and in roller group staggered form milling train, can concern and change roll gap by the position between the roll that change to intersect by moving axially CVC roll with different overall diameters.The energy force rate of the change roll gap of these milling trains is utilized the milling train height of roll bending simply.
2. the roller diameter in not cotype milling train is one and comprises a pair of milling train that has the working roll of different-diameter respectively, and only drives large diameter working roll and rotate.Because the diameter of a roller of working roll centering is less, thus roller diameter not the cotype milling train can be at an easy rate by a little roll-force with the heavy reduction rolling sheet billet.Since by only driving large diameter working roll on sheet billet the effect shearing force, so roller diameter not the cotype milling train can more easily sheet billet be rolled by the conventional milling train more identical with heavy reduction than work roll diameter.Therefore, even roller diameter not the roll-force of cotype milling train be lower than conventional milling train or 1. described in and be included in the roll-force of the milling train in the leading portion, it also can be with conventional milling train or 1. and be included in the identical drafts rolled sheet metal base of milling train in the leading portion.Thus, though roller diameter not few the and roller diameter of the frame number of cotype milling train not the cotype milling train have compact layout, it also can realize aforementioned effect, and with enough drafts rolled sheet metal bases.Roller diameter not cotype milling train can obtain by conventional milling train is done very little change, and a roller that for example will have larger-diameter roller centering changes the less roll of diameter into.Therefore, then can simply constitute sheet hot rolling mill of the present invention at low cost if can obtain in order to constitute the existing milling train of sheet hot rolling mill of the present invention.
Have 1. and the sheet hot rolling mill of the present invention of layout 2. can suppress the formation of the thick and edge thinning of the middle cardiac prominence of sheet material, and reduce since following operation a) to c) and on the sheet material end section, form the frequency of creasing.
A) the middle cardiac prominence of sheet material thick can by change and control finishing mill leading portion part 1. in roll gap shape and suppressed.The middle cardiac prominence of sheet material is thick be since roll gap with respect to width, promptly the inhomogeneities along the direction of roll axis causes, this mainly is that roll bending by milling train causes.When the milling train described in utilizing 1. suitably changes and controls roll gap, can reduce the center convex thick part branch of sheet billet or produce to have the thick sheet material of cardiac prominence in the best.Control glacing flatness and the similar index that the center convex thick part branch of sheet material usually can damage sheet material by changing roll gap.Because this control is to be implemented by the leading portion of finishing mill, so can utilize stage casing or back segment to improve the glacing flatness of sheet material.When the middle cardiac prominence that reduces sheet material by leading portion was thick, it is thick that back segment only need be kept less middle cardiac prominence, thus roller diameter not the cotype milling train can stably be rolled operation.
B) part that can be by utilizing the finishing mill back segment 2. under little roll-force the rolled sheet metal base reduce the possibility that the end section of sheet billet is creased.When the sheet billet end section that is not subjected to any tension force laterally moves (shifting to the right or the left side of roll line) and clashes into guide plate in the milling train or during analog, just form and crease.The result of study of creasing is shown the end section of sheet billet is difficult to traversing when roll-force is low.This means that the traversing of sheet billet end section is owing to rolling device inaccuracy symmetry produces; That is, when the not strict symmetry of the roll of milling train, sheet billet can be pushed to right side or left side.Thereby roll-force is more little, with sheet billet to the right or the left avertence power of pressing more little, and the traversing tendency of end section is more little.Therefore, even when rolling quite thin band, this milling train forms the possibility of creasing on end section also very little.Usually, at traversing (mobile width) of finishing mill upper thin sheet base end section milling train greater than back segment.Thereby, can be by the milling train of back segment with the less roll-force ground rolled sheet metal base that effectively prevents to crease.
C) by suppressing the generation of edge thinning with little roll-force rolled sheet metal base in 2. in the part of finishing mill back segment.Because edge thinning is by being formed at respectively being used for working portion that sheet billet is exerted pressure and causing corresponding to the roll portion boundary place in the space in the outside, sheet billet edge and shoulder with circular shape of roll, so thereby can form simple depression on the sheet billet and reduce edge thinning by roll being pressed in little roll-force.
Since this sheet hot rolling mill 1. in milling train (CVC milling train or roller group staggered form milling train) be more than two or two, so it is thick to suppress the middle cardiac prominence of sheet material effectively.Because 2. milling train (roller diameter is the cotype milling train not) has more than two or two, thus can come drafts rolled sheet metal base by using a very little roll-force with necessity, thus suppress effectively to crease and the generation of edge thinning.
Sheet hot rolling mill of the present invention can further include except above-mentioned part that a temperature that is used to prevent sheet material between the first rolling mill of the roughing mill end rolling mill of upstream side and finishing mill descends prevents the temperature lowering means, this prevents that the temperature lowering means from can be a continuous tunnel furnace, a sheet billet coiling machine/uncoiler or a sheet billet heater.
Will be by of the low velocity motion of the rolling sheet material of finishing mill with the mill speed that depends on finishing mill.Therefore, sheet material stops one section long time in finishing mill the place ahead, and temperature is towards the end section decline of sheet billet.The temperature of sheet material in the finishing mill back segment is lower than its temperature in the finishing mill leading portion.This sheet hot rolling mill is by means of preventing that the temperature lowering means from will remain on required level or the temperature of sheet material is risen in the temperature of the sheet material before rolling by finishing mill.When the temperature of sheet material is enough high, to compare when not high enough with the sheet material temperature, the required roll-force of finish rolling is lower.Therefore, this can be by preventing that the sheet hot rolling mill that the temperature lowering means prevents that the sheet material temperature from descending from can utilize little roll-force to realize finish rolling operation (the particularly operation of finishing mill back segment).Because the fore-end and the end section of sheet billet can keep same temperature,, and can realize stable rolling so rolling load is constant.Thereby, the generation that can suppress edge thinning effectively and crease.
Brief description of drawings
Fig. 1 a is the schematic diagram of the sheet hot rolling mill in the first embodiment of the invention;
Fig. 1 b is the front view of the major part of the CVC milling train that intercepted of the b-b line along Fig. 1 a;
Fig. 1 c is a front view that is similar to Fig. 1 b, and wherein working roll axially moves mutually to change roll gap;
Fig. 1 d is corresponding to the roller diameter of the indicated part of d among Fig. 1 a side view of cotype milling train major part not;
Fig. 2 a is the schematic diagram of sheet hot rolling mill in the second embodiment of the invention;
Fig. 2 b is the schematic diagram of sheet hot rolling mill in the third embodiment of the invention;
Fig. 2 c is the schematic diagram of sheet hot rolling mill in the fourth embodiment of the invention;
Fig. 3 is the view of a bench roller group staggered form milling train; And
Fig. 4 is the curve map that is illustrated in the Temperature Distribution in the sheet material of finishing mill front side.
The various details preferred embodiment.Fig. 1 a is the full view of the sheet hot rolling mill A in the first embodiment of the invention, Fig. 1 b shows and is included in included a pair of working roll 31a of the CVC milling train among the sheet hot rolling mill A shown in Fig. 1 a and 31b (along the view of the intercepting of the b-b line among Fig. 1 a), Fig. 1 c shows and is movable relative to each other vertically changing the working roll of roll gap, and Fig. 1 d shows be included in not cotype milling train 32 (part of being represented by d) of the roller diameter among the sheet hot rolling mill A shown in Fig. 1 a in Fig. 1 a.
Sheet hot rolling mill A is by arranging that following part constitutes.Heating furnace 1 is arranged on upstream extremity (left side among Fig. 1 a), and a roughing mill 10 is arranged on the rear of heating furnace 1.Heating furnace 1 is one and is used for plate slab that promptly raw material is heated to the heater about 1200 ℃.The plate slab that roughing mill 10 will heat is rolled into the sheet material that thickness is about 30mm.Represent roughing mill 10 by single frame typically among Fig. 1 a.This roughing mill 10 can have a plurality of frames.Finishing mill 30 with six frames is arranged on the rear of roughing mill 10, and the coiling machine 40 that is used to batch rolled plate is arranged on the rear of finishing mill 30.
This sheet hot rolling mill A has following configuration, to be used for the producing sheet metal material that thickness is equal to or less than 1.2mm (particularly being equal to or less than 1.0mm) and has high dimensional accuracy reposefully.
Three frame 31A of the leading portion of finishing mill 30,31B and 31C are so-called CVC milling trains, that is, its roller diameter is from the end to end continually varying milling train of roll.As shown in Figure 1a, the CVC milling train is a four-high mill, and each all has working roll 31a, 31b and backing roll 31c, 31d.Shown in Fig. 1 b, the working roll 31a of every rolling mill and 31b have a protuberance (CVC, diameter changes continuously).Shown in Fig. 1 c, working roll 31a and 31b can move along opposite axial direction respectively simultaneously.When moving axially working roll 31a and 31b and adjust position between working roll 31a and the 31b and concern, can change the shape of the roll gap between working roll 31a and the 31b, that is, and the shape in the slit of the part that working roll 31a and 31b contact with sheet material x.Also known roll-bending device can be combined with working roll 31a and 31b.
Three rolling mill 32A of finishing mill 30 back segments, 32B and 32C are not cotype milling trains of so-called roller diameter.As shown in Figure 1a, roller diameter not cotype milling train is a four-high mill, and each milling train has working roll 32a, 32b and backing roll 32c, 32d.Shown in Fig. 1 d, working roll 32a has different diameters respectively with 32b.Have only the bigger bottom working roll 32b of diameter by driving rotations such as not shown motor, and the top working roll 32a of minor diameter is free roller, is applied thereto without any driving force.Not shown well-known working roller bending device is installed on each frame, is used for crooked working roll 32a, 32b.As roller diameter three frame 32A of cotype milling train not, in each of 32B and 32C, top working roll 32a all has less diameter, has only bottom working roll 32b to be driven.Therefore, on sheet material x, apply a shearing force.Because top working roll has less diameter, so even roll-force is less, also can be with enough drafts rolled plates.
In sheet hot rolling mill A, three frame 31A of leading portion, the working roll 31a of 31B and 31C and 31b are skew vertically shown in Fig. 1 c, so that proofread and correct the center convex thick part branch of sheet material x, and no matter its thickness and width how, form the center convex thick part branch an of the best thus.By three frame 32A of back segment 32,32B and 32C, promptly roller diameter cotype milling train not utilizes little roll-force, can reduce the edge thinning among the sheet material x.The formation of the thick and edge thinning of cardiac prominence and can the high sheet material of production dimensional accuracy during the sheet hot rolling mill A that six finishing mills 30 are housed can suppress.So that when producing the sheet metal that 1.2mm is thick, 1220mm is wide, it is thick to form the middle cardiac prominence that on average is about 50 μ m on the part of distance sheet metal edge 25mm when adopting traditional rolling sheet metal of sheet hot rolling mill.By studies have shown that the present inventor carried out, utilize this sheet hot rolling mill A, when the sheet metal of the sheet metal of producing thick 1.2mm, wide 1220mm or thick 1.0mm, wide 1000mm, thick being limited in of middle cardiac prominence on average can be about 15 μ m, and its maximum is about 30 μ m.
When adopting this sheet hot rolling mill A rolled plate, utilize three frame 32A of back segment 32,32B and 32C adopt little roll-force can prevent from effectively to form on the end section of sheet material x and crease.When utilizing this little roll-force rolled plate x, can suppress to apply asymmetric power (applying different power with the left side to the right), to reduce sheet material or displacement left to the right to sheet material x.Even the thickness of sheet material x is little of 1.2mm or lower, sheet hot rolling mill A also can reduce the frequency that takes place of creasing and also can produce reposefully.When with traditional sheet hot rolling mill production sheet metal that 1.2mm is thick, 1220mm is wide, form the frequency ratio of creasing and be about 3% (per 100 steel plates produce three and crease).When adopting sheet hot rolling mill A of the present invention to produce same sheet metal, the frequency ratio that forms of creasing can be limited to about 0.5%, and when with sheet hot rolling mill A production sheet metal that 1.0mm is thick, 1220mm is wide, the numerical value of this frequency ratio can be limited in about 3%.
Fig. 2 a, 2b and 2c show other embodiments of the invention.Sheet hot rolling mill B shown in Fig. 2 a is equipped with the continuous tunnel furnace 21 between the first rolling mill 31A of last frame that is arranged on roughing mill 10 and finishing mill 30.Continuous tunnel furnace 21 is tunnel type stoves that extend along roll line, and can be with the heater that is arranged in the stove, for example heating sheet material such as burner.The sheet material feed speed of first frame 31A of last frame of roughing mill 10 and finishing mill 30 differ from one another (the former sheet material feed speed is faster than the latter).Because with the low speed rolling of the muzzle velocity that depends on finishing mill 30 sheet material, in the front end constantly reduction of the sheet material temperature of finishing mill 30 import departments to tail end ground from sheet material from the former output.21 of continuous tunnel furnaces have prevented this decrease of temperature.Thereby the rolling necessary roll-force of sheet material that has prevented temperature decline through heating is less than the rolling necessary roll-force of sheet material without heating.Because fore-end and end section can be by rolling with substantially the same roll-force, milling train in the finishing mill 30, the roller diameter of back segment 32 cotype milling train 32A not particularly, the roll-force of 32B and 32c can be quite low, and this has strengthened the effect that suppresses edge thinning and crease.Usually, the temperature decline at the sheet material end section is maximum.Therefore, the effect highly significant of continuous tunnel furnace 21 aspect the formation that suppresses to crease.Thereby sheet hot rolling mill B (back will describe sheet hot rolling mill C and D) similarly, can more effectively reduce than hot rolling rolling machine system A and form the frequency of creasing.
Shown in Fig. 2 a, the finishing mill 30 of sheet hot rolling mill B has seven rolling mills.Similar to sheet hot rolling mill A shown in Fig. 1 a, three rolling mill 32A of back segment 32,32B and 32C are not cotype milling train of roller diameter.The difference of sheet hot rolling mill A shown in sheet hot rolling mill B and Fig. 1 a is that it is provided with one and has four rolling mill 31A, 31B, and the leading portion of 31C and 31D, wherein these four frames are provided with the CVC roll.The frame number of the milling train of finishing mill 30 (frame) number and roughing mill 10 is similar, can determine rightly according to the thickness of sheet material and grade and speed of production.At least some frame of the leading portion 31 of finishing mill 30 can be well-known roller group staggered form milling train 36, and as shown in Figure 3, this milling train can change the shape of roll gap.Roller group staggered form milling train 36 is a kind of well-known milling trains, it comprises a pair of roller group of being made up of working roll 36a and backing roll 36c and the roller group of being made up of working roll 36b and backing roll 36d, be arranged to make this pair roller group to be not parallel to each other mutually the roll and intersect mutually, the mid portion of working roll 36a and 36b is the most close mutually, and can change position relation between this pair roller group (roller group between angle).The design of sheet hot rolling mill can change under the prerequisite that does not exceed scope of the present invention.For example, the milling train of back segment 32 can be the roller diameter cotype milling train not that the CVC milling train is housed.Similarly, can be at the sheet hot rolling mill C shown in Fig. 2 b and Figure 26 and D and carry out this class at the sheet hot rolling mill A shown in Fig. 1 a and change.
Sheet hot rolling mill C shown in Fig. 2 b is provided with a sheet billet coiling machine/uncoiler 22 between the first rolling mill 31A of the last rolling mill of roughing mill 10 and finishing mill 30.Coiling machine/uncoiler 22 is a kind of equipment that is used to batch with uncoiling sheet material (sheet billet), for example the Coilbox that can buy from Steltech Co., Ltd (Canada) on market
Because the temperature of sheet material has the tendency of decline before sending sheet material to finishing mill 30 as mentioned above, so descend by the long slab material being coiled into the temperature that a roll coil of strip suppresses the long slab material, with the sheet material uncoiling and send finishing mill 30 to, descend then with the temperature that reduces sheet material.Thereby available little roll-force is carried out finish rolling to sheet material, and this has prevented the formation edge thinning effectively and has creased.
Sheet hot rolling mill D shown in Fig. 2 c is provided with and similar coiling machine/uncoiler 22 shown in Fig. 2 b, after coiling machine/uncoiler 22 He before the finishing mill 30 a sheet billet heater 23 is set simultaneously.The heater of sheet billet heater 23 utilizations such as burner heats the fore-end and the end section of sheet material, so that improve the sheet material fore-end that batched by coiling machine/uncoiler 22 and the temperature of end section, because the temperature of its fore-end and end section is easy to descend.Crease and occur on the end section of sheet material.Therefore, when the end section of sheet material was heated by sheet billet heater 23, the end section of sheet material can be rolled by the roll-force that reduces, thereby can reduce the speed of creasing and taking place effectively.
Can bring into play following effect according to sheet hot rolling mill of the present invention.
1) suppresses center convex thick part branch and edge thinning formation partly in the sheet material, can reduce the frequency that formation is creased on the sheet material end section simultaneously., therefore can stably produce to have for example thick about 1.2mm or thinner light sheet, and can be with high dimensional accuracy rolled plate owing to even also being difficult to form when sheet material is quite thin creases.
2) owing to do not need special device and equipment, equipment cost is lower, and can construct in a short time according to sheet hot rolling mill of the present invention by reequiping existing sheet hot rolling mill simply.
3) heater that places being used between roughing mill and the finishing mill to prevent that the sheet material temperature from descending has further suppressed edge thinning and the formation of creasing effectively, this is because when the temperature of sheet material descended before sheet material is transmitted to finishing mill, can carry out finish rolling with less roll-force.
Claims (14)
1. sheet hot rolling mill, this system has a finishing mill that comprises a leading portion and a back segment;
It is characterized by, leading portion comprises two or many CVC milling trains, and
Back segment comprises not cotype milling train of two or many roller diameters.
2. sheet hot rolling mill as claimed in claim 1 is characterized by, and roller diameter not each of cotype milling train includes the roll that rotates freely of a large diameter roll that is driven in rotation and a minor diameter.
3. sheet hot rolling mill as claimed in claim 2 is characterized by, and having large diameter roll is a bottom roll, and the roll with minor diameter is a topping roll.
4. sheet hot rolling mill as claimed in claim 1 further comprises a roughing mill that is arranged in the finishing mill upstream side, is provided with simultaneously to be used to prevent that the sheet material temperature from descending prevents the temperature lowering means between roughing mill and finishing mill.
5. sheet hot rolling mill as claimed in claim 4 is characterized by, and the described temperature lowering means that prevents is a continuous tunnel furnace, wherein is provided with a heater, and allows sheet material by this continuous tunnel furnace.
6. sheet hot rolling mill as claimed in claim 4 is characterized by, and prevents that the temperature lowering means from being a platen material coiling machine/uncoiler.
7. sheet hot rolling mill as claimed in claim 4 wherein, prevents that the temperature lowering means from being one and being used to heat the fore-end of sheet material and the heater of end section.
8. sheet hot rolling mill, this system has a finishing mill that comprises a leading portion and a back segment;
It is characterized by, leading portion comprises two or many roller group staggered form milling trains; And
Back segment comprises not cotype milling train of two or many roller diameters.
9. sheet hot rolling mill as claimed in claim 8 is characterized by, and roller diameter not each of cotype milling train includes the roll that rotates freely of a major diameter roll that is driven in rotation and a minor diameter.
10. sheet hot rolling mill as claimed in claim 9 is characterized by, and having large diameter roll is a bottom roll, and the roll with minor diameter is a topping roll.
11. sheet hot rolling mill as claimed in claim 8 further comprises a roughing mill that is arranged in the finishing mill upstream side, and one be arranged at that being used between roughing mill and the finishing mill prevent that the sheet material temperature from descending prevent the temperature lowering means.
12. sheet hot rolling mill as claimed in claim 8 is characterized by, the described temperature lowering means that prevents is a continuous tunnel furnace that is provided with heater, and this continuous tunnel furnace allows sheet material to pass through wherein.
13. sheet hot rolling mill as claimed in claim 8 is characterized by, the described temperature lowering means that prevents is a platen material coiling machine/uncoiler.
14. sheet hot rolling mill as claimed in claim 8 is characterized by, the described temperature lowering means that prevents is a heater that is used to heat sheet material fore-end and end section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP253161/1998 | 1998-09-08 | ||
| JP10253161A JP2933923B1 (en) | 1998-09-08 | 1998-09-08 | Hot strip mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1277568A true CN1277568A (en) | 2000-12-20 |
| CN1126613C CN1126613C (en) | 2003-11-05 |
Family
ID=17247391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99801542A Expired - Fee Related CN1126613C (en) | 1998-09-08 | 1999-09-06 | Sheet hot rolling mill |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1033182A4 (en) |
| JP (1) | JP2933923B1 (en) |
| KR (1) | KR100396012B1 (en) |
| CN (1) | CN1126613C (en) |
| TW (1) | TW425316B (en) |
| WO (1) | WO2000013812A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100450653C (en) * | 2006-11-28 | 2009-01-14 | 中冶南方工程技术有限公司 | Method for preventing vibration of steel bar under high-speed rolling station of ultra-thin plate |
| CN103302789A (en) * | 2012-03-08 | 2013-09-18 | 通用汽车环球科技运作有限责任公司 | Method for manufacturing profiled strips and hollow profiled bodies and a device for implementing the method |
| CN106102939A (en) * | 2014-03-19 | 2016-11-09 | 杰富意钢铁株式会社 | The hot-rolling method of high carbon steel |
| CN108700866A (en) * | 2016-02-22 | 2018-10-23 | 首要金属科技奥地利有限责任公司 | The on-line calibration of the roll gap of rolling-mill housing |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10102821A1 (en) * | 2001-01-23 | 2002-07-25 | Sms Demag Ag | Rolling mill used for producing planar strips comprises working rollers and support rollers axially arranged in a roll stand |
| US7076983B2 (en) | 2001-03-16 | 2006-07-18 | Nakayama Steel Works, Ltd. | Apparatus and method for hot rolling |
| WO2002074460A1 (en) * | 2001-03-16 | 2002-09-26 | Nakayama Steel Works, Ltd. | Hot rolling mill and hot rolling method |
| JP3413181B2 (en) * | 2001-08-03 | 2003-06-03 | 川崎重工業株式会社 | Continuous hot rolling equipment |
| DE10339191A1 (en) * | 2003-08-22 | 2005-03-17 | Sms Demag Ag | Extending use of coil box between pre-train and finishing train for rolled material in hot rolling mill comprises applying pressing force to coil in mandrel-less coil box, and placing in roller table sink |
| CN101992215B (en) * | 2009-08-13 | 2012-07-04 | 宝山钢铁股份有限公司 | Axial movement control method for continuously variable crown (CVC) working roll |
| KR101253851B1 (en) * | 2010-12-27 | 2013-04-12 | 주식회사 포스코 | Method and Apparatus for Reducing Edge Up of Thick Hot Rolled Steel Plate at Finish Rolling |
| JP2014061528A (en) * | 2012-09-20 | 2014-04-10 | Ihi Corp | Continuous rolling equipment |
| TWI551366B (en) * | 2013-12-25 | 2016-10-01 | The use of round steel wire rolling forming thin steel sheet and steel fiber forming method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5831242B2 (en) * | 1980-03-17 | 1983-07-05 | 三菱重工業株式会社 | Pair-cross type 4-high rolling mill |
| DE3038865C1 (en) * | 1980-10-15 | 1982-12-23 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | Roll stand with axially movable rolls |
| JPS62137102A (en) * | 1985-12-09 | 1987-06-20 | Nippon Steel Corp | Production of hot rolled titanium sheet having good surface characteristic |
| JPS62137102U (en) * | 1986-02-24 | 1987-08-29 | ||
| JPS62197209A (en) * | 1986-02-25 | 1987-08-31 | Kobe Steel Ltd | Camber controlling method for hot rolling of metal plate |
| JP2616917B2 (en) * | 1987-01-24 | 1997-06-04 | 株式会社日立製作所 | Rolling method by roll shift rolling mill |
| US5174144A (en) * | 1990-04-13 | 1992-12-29 | Hitachi, Ltd. | 4-high rolling mill |
| JPH06106207A (en) * | 1992-09-24 | 1994-04-19 | Kawasaki Steel Corp | Continuous hot rolling equipment for billet |
| DE69613178T2 (en) * | 1995-07-10 | 2001-09-27 | Kawasaki Steel Corp., Kobe | Method and device for continuous hot strip finishing |
| US5875663A (en) * | 1996-07-18 | 1999-03-02 | Kawasaki Steel Corporation | Rolling method and rolling mill of strip for reducing edge drop |
-
1998
- 1998-09-08 JP JP10253161A patent/JP2933923B1/en not_active Expired - Lifetime
-
1999
- 1999-09-06 KR KR10-2000-7004924A patent/KR100396012B1/en not_active IP Right Cessation
- 1999-09-06 CN CN99801542A patent/CN1126613C/en not_active Expired - Fee Related
- 1999-09-06 EP EP99940680A patent/EP1033182A4/en not_active Withdrawn
- 1999-09-06 WO PCT/JP1999/004822 patent/WO2000013812A1/en not_active Application Discontinuation
- 1999-09-07 TW TW088115528A patent/TW425316B/en not_active IP Right Cessation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100450653C (en) * | 2006-11-28 | 2009-01-14 | 中冶南方工程技术有限公司 | Method for preventing vibration of steel bar under high-speed rolling station of ultra-thin plate |
| CN103302789A (en) * | 2012-03-08 | 2013-09-18 | 通用汽车环球科技运作有限责任公司 | Method for manufacturing profiled strips and hollow profiled bodies and a device for implementing the method |
| CN106102939A (en) * | 2014-03-19 | 2016-11-09 | 杰富意钢铁株式会社 | The hot-rolling method of high carbon steel |
| CN106102939B (en) * | 2014-03-19 | 2018-02-13 | 杰富意钢铁株式会社 | The hot-rolling method of high carbon steel |
| CN108700866A (en) * | 2016-02-22 | 2018-10-23 | 首要金属科技奥地利有限责任公司 | The on-line calibration of the roll gap of rolling-mill housing |
| US11173529B2 (en) | 2016-02-22 | 2021-11-16 | Primetals Technologies Austria GmbH | In-line calibration of the roll gap of a roll stand |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100396012B1 (en) | 2003-08-27 |
| KR20010031851A (en) | 2001-04-16 |
| TW425316B (en) | 2001-03-11 |
| JP2933923B1 (en) | 1999-08-16 |
| EP1033182A4 (en) | 2005-06-01 |
| WO2000013812A1 (en) | 2000-03-16 |
| JP2000084601A (en) | 2000-03-28 |
| EP1033182A1 (en) | 2000-09-06 |
| CN1126613C (en) | 2003-11-05 |
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