EP0400568B1 - Procédé de laminage dans un laminoir à cinq cylindres - Google Patents

Procédé de laminage dans un laminoir à cinq cylindres Download PDF

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Publication number
EP0400568B1
EP0400568B1 EP90110143A EP90110143A EP0400568B1 EP 0400568 B1 EP0400568 B1 EP 0400568B1 EP 90110143 A EP90110143 A EP 90110143A EP 90110143 A EP90110143 A EP 90110143A EP 0400568 B1 EP0400568 B1 EP 0400568B1
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EP
European Patent Office
Prior art keywords
roll
rolling
work
control
rolls
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90110143A
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German (de)
English (en)
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EP0400568A3 (fr
EP0400568A2 (fr
Inventor
Yoshio Takakura
Toshiyuki Kajiwara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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Filing date
Publication date
Priority claimed from JP1242162A external-priority patent/JPH082453B2/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP0400568A2 publication Critical patent/EP0400568A2/fr
Publication of EP0400568A3 publication Critical patent/EP0400568A3/fr
Application granted granted Critical
Publication of EP0400568B1 publication Critical patent/EP0400568B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
    • 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
    • B21B2013/026—Quinto, five high-stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals

Definitions

  • the invention relates to a method for rolling a sheet material with a small rolling force and a small rolling reduction in a five-high rolling mill as it is defined in the first part of claim 1 (see US-A-4 194 382, Column 6, lines 19-32).
  • a rolling mill of a small rolling reduction and a small rolling force e.g., a skinpass rolling mill
  • a four-high rolling mill which includes upper and lower work rolls provided with bending devices and upper and lower backup rolls supporting these work rolls, as disclosed in the JP-A-48-22344.
  • such a four-high rolling mill does not have a sufficient ability in shape control, and insufficiency of this ability is compensated with various work rolls provided with different crowns.
  • a six-high rolling mill superior in the shape control ability has been suggested and applied to practical use (see JP-B-57-55484; US 4 194 382).
  • This six-high rolling mill is arranged in such a manner that upper and lower intermediate rolls are disposed between upper and lower work rolls of the same diameter and upper and lower backup rolls of the same diameter, respectively and that roll bending devices are installed on the upper and lower work rolls and the upper and lower intermediate rolls, both sets of these bending devices being capable of providing a great ability in the shape control.
  • this six-high rolling mill causes portions of the side ends of a rolling stock to remain non-rolled so that edge wrinkles are formed on the side ends of the rolling stock, thereby resulting in a problem that formation of such edge wrinkles cannot be adequately prevented.
  • a conventional multi-high rolling mill whose sections above and below a rolling stock have different numbers of rolls or a conventional five-high rolling mill in particular is disclosed in the US 4 194 382 and and in the JP-B 62-46245.
  • Such a five-high rolling mill includes upper and lower work rolls of different diameters, with the upper work roll being a roll of the smaller diameter, and thus, a large rolling reduction can be obtained from a small rolling force.
  • bending devices are installed on both the intermediate roll and the lower work roll of the larger diameter so as to cause the five-high rolling mill to exhibit its ability in controlling a sheet crown. Hence it is possible to control a simply curved (concaved or convex) crown of the rolling stock in its entire width, decrease the rolling force, and enhance the effect of the benders as a result.
  • a five-high rolling mill including an intermediate roll which has the same drum length as the width of the rolled strip sheet, in which upper and lower work rolls of the same diameter are provided with bending devices, is disclosed in the JP-A-54-39349 and in the JP-B-53-34789.
  • a skinpass rolling mill installed in a continuous annealing line, since a rolling stock of different widths are continuously supplied thereto, the above-mentioned five-high rolling mill is quite unlikely to be applied to practical use.
  • the rolls are required to have relatively large diameters in order to prevent the cross buckle or folding in the skinpass rolling operation. Also, it is desirable for upper and lower work rolls to have the same diameter (practically the same diameter) in terms of lives of dull of the work rolls and prevention of warping of a strip sheet after the skinpass rolling process.
  • the rolling mill As for the shape control of the rolling material to obtain a strip sheet of the excellent surface quality, it is necessary for the rolling mill to have an ability in composite shape control for correcting both of edge wrinkles and center buckle.
  • the object of the present invention is to provide a rolling method in the multi-high rolling mill by which the ability of the composite shape control of the rolled material can be fully exhibited during the rolling operation of a small rolling reduction and also formation of any edge wrinkles on the side end portions of the strip sheet can be prevented.
  • the roll bending devices installed on the intermediate roll and the roll bending devices installed on the work roll in the roll set where this intermediate roll is disposed are all actuated to control a composite crown of a strip sheet over its entire width.
  • the roll bending devices installed on the work roll directly supported by the backup roll are actuated to control the crown of the strip sheet in its side end portions, thereby performing both of the composite shape control of the strip sheet and the control of the widths of the side end portions of the strip sheet which are not to be rolled.
  • the present invention may employ a multi-high rolling mill which has an excellent ability in composite shape control for accomplishing improvement of the surface quality of strip sheet so that edge wrinkles can be prevented from forming on the side ends of strip sheet.
  • the rolling mill includes an intermediate roll disposed between one of upper and lower work rolls having substantially the same diameter and a backup roll, the drum length of the intermediate roll being formed to be larger than an extent of the maximum width of the strip sheet, and the upper and lower work rolls and the intermediate roll are respectively provided with roll bending devices which have different control characteristics for moderating a crown shape of the strip sheet.
  • the composite shape control of strip sheet is mainly performed by the intermediate roll bender and the work roll bender on one side where the intermediate roll is disposed, so as to improve the surface quality of the strip sheet, and the widths of side end portions of the strip sheet which have not been rolled are controlled by the work roll bender on the other side where the intermediate roll is not disposed, so as to remarkably reduce the non-rolled side end portions of the strip sheet, thereby preventing the formation of edge wrinkles.
  • the rolling mill is provided with the roll benders of three kinds, i.e., the intermediate roll bender, the work roll bender on the side where the intermediate roll is disposed (hereinafter referred to as the 6H-side), and the work roll bender on the side where the intermediate roll is not disposed (hereinafter referred to as the 4H-side).
  • These roll benders have such shape control degrees as to differ the respective characteristics for controlling the crown of the rolled strip sheet from one another, and thus, not only the composite shape but also the widths of the side end portions having edge wrinkles can be controlled.
  • Case 1 indicates a control degree when only the roll bender for the 4H-side work roll directly supported by the backup roll is actuated, and this control degree generally has a value from 2.6 to 3.3.
  • Case 2 indicates a control degree when only the roll bender for the 6H-side work roll supported by the intermediate roll is actuated, and this control degree generally has a value from 2.0 to 2.5.
  • Case 3 indicates a control degree when only the roll bender for the intermediate roll is actuated, and this control degree generally has a value from 1.7 to 1.9.
  • Case 4 indicates a control degree when both of the above-mentioned roll benders for the 4H-side and 6H-side work rolls are actuated.
  • coefficients a and b can be changed by force of the benders.
  • the error when the disturbance of the second degree is controlled by one kind of bender having a degree of 2.2, the error is 2.6%, and when it is controlled by two kinds of benders having degrees of 1.8 and 2.2, the error is drastically reduced to 0.16% (which is 1/16.3 of 2.6%).
  • the intermediate roll bender conducts the control with the degree of 1.8; the 6H-side work roll bender conducts the control with the degree of 2.2; and the 4H-side work roll bender conducts the control with the degree of 2.8. Therefore, the composite shape control and the control of the widths of the wrinkled side end portions can be simultaneously effected. It is ideal to perform the composite shape control of strip sheet material by the intermediate roll bender and the 6H-side work roll bender and to control the widths of wrinkled side end portions of the rolled strip sheet by means of the 4H-side work roll bender.
  • the five-high rolling mill makes it possible to reduce the widths of the wrinkled side end portions to a great extent while maintaining the strip sheet in the desirable shape. This has never been accomplished by any conventional five-high rolling mill before.
  • control degrees m and n differ from each other as much as possible, i.e., it is more preferable that the control degree of the 4H-side work roll bender has a value, for example, from 2.6 to 3.3 at most; the control degree of the intermediate roll bender has a value from 1.7 to 1.9 at least; and the control degree of the 6H-side work roll bender has a value between that of the 4H-side work roll bender and that of the intermediate roll bender, e.g., from 2.0 to 2.4.
  • the intermediate roll is required to have a diameter larger than that of the work rolls.
  • the control degrees m has value close to that of the control degree n , the effect will not be much different from that of the control by one kind of bender, thereby causing a large shape defect.
  • reference numerals 1 and 2 denote upper and lower work rolls which are arranged to have substantially the same diameter.
  • Reference numerals 3 and 4 are upper and lower backup rolls, and reference numeral 5 denotes an intermediate roll which is disposed between one of the work rolls, i.e., the upper work roll 1 and the upper backup roll 3.
  • Increase bending cylinders 10 for the upper work roll 1 are provided in projecting blocks 17 for sustaining bearing boxes 7 of the 6H-side upper work roll 1, respectively.
  • increase bending cylinders 11 and decrease bending cylinders 12 for the lower work roll 2 are provided in the same projecting blocks 17 for sustaining bearing boxes 8 of the lower work roll 2, respectively.
  • These bending cylinders 10, 11 and 12 exert the bending force on the respective bearing boxes 7 and 8 of the upper and lower work rolls 1 and 2 so as to control degrees of bending of the work rolls 1 and 2.
  • bending cylinders 13 provided in projecting blocks 19 for sustaining bearing boxes 9 thereof are arranged to exert the bending force on such bearing boxes 9, thus causing the intermediate roll 5 to be bent.
  • the bending effect of the 6H-side upper work roll 1 only reaches the vicinities of the end portions of the upper work roll 1 due to the existance of the intermediate roll so that the thicknesses of side end portions of strip sheet 6 can be controlled by bending the axis of the work roll 1 in the vicinities of its end portions.
  • the sheet thickness over the entire width can be controlled by controlling the axial bending of the intermediate roll in the entire length through the work roll 1. Therefore, the composite shape control of the strip sheet can be achieved by properly combining these two kinds of roll bending effects, thereby enabling the rolling of the strip sheet having an excellent surface quality under the conditions of a small rolling reduction and a small rolling force.
  • the bending effect of the 4H-side lower work roll 2 does not reach the center of the lower work roll 2, and accordingly, the axial bending of this work roll in its end portions is largely controlled, so that the side end portions of the strip sheet which have not been rolled conventionally can be effectively rolled, thus preventing edge wrinkles from being produced on the side end portions of the strip sheet.
  • the decrease benders 12 serving as the rolling bending devices provided on the 4H-side work roll 2 cause the side end portions of the work roll 2 to be bent toward the strip sheet 6 and pressed onto the surface of the strip sheet so as to remarkably reduce the non-rolled side end portions of the strip sheet 6, thereby preventing the formation of edge wrinkles (see Fig. 11).
  • the 6H-side work roll benders 10 and the intermediate roll benders 13 are nothing but increase benders.
  • the effective drum length of the 6H-side backup roll 3 may be made smaller than the maximum width of the strip sheet 6, as shown in Figs. 4, 5A and 5B. In other words, as shown in Fig.
  • the effective drum length of the 6H-side backup roll is made smaller than that of the intermediate roll, or when the intermediate roll is oscillated by a stroke of ⁇ 10 mm or so in case of the five-high rolling mill including the 6H-side backup roll which is provided with a relatively large roll crown when applied to the rolling condition of a large rolling force, defects caused by the shoulders of the backup roll can be prevented from remaining on the strip sheet conveniently.
  • both the bending effects of the work roll and the intermediate roll can be further enlarged without changing the control degrees.
  • a multi-high rolling mill is constituted of the upper and lower work rolls 1 and 2 of substantially the same diameter and also a certain number of supporting rolls and a different number of supporting rolls for respectively supporting these work rolls 1 and 2 so that the upper section and the lower section of the rolling mill with respect to the strip sheet include sets of the rolls in different numbers.
  • the roll bending devices 13 are installed on the supporting roll 5 which directly supports the work roll 1 in the roll set having the larger number of the rolls, and the upper and lower roll sets are arranged to have different control degrees each indicating a degree of change in the sheet crown of the strip sheet which can be controlled by the roll bending devices 13.
  • the roll bending devices 10 and 11 are installed on the respective work rolls 1 and 2 of the upper and lower roll sets in order to differ the control degrees of the sheet crown for the upper and lower work rolls 1 and 2 which can be controlled by the respective roll bending devices 10 and 11, and as for the control orders of these roll bending devices 13, 10 and 11, the supporting roll 5 in one of the roll sets having the larger number of the rolls, the work roll 1 in this roll set, and the work roll 2 in the other roll set having the smaller number of the rolls are controlled with the control degree of values gradually increasing in this order.
  • the rolling mill of the invention significantly requires including three kinds of control means which have control orders different from one another.
  • FIGs. 6 and 7 Another embodiment for enhancing the roll bending effects of the rolling mill is shown in Figs. 6 and 7, in which the drum length of the 6H-side intermediate roll 5 is made as small as possible in a range larger than the maximum sheet width of the strip sheet 6. That is to say, when the intermediate roll 5 has a small drum length, the end portions thereof are not in contact with the backup roll 3 of a large diameter, and consequently, not only the effect of the benders for the 6H-side intermediate roll 5 but also the effect of the benders for the upper work roll 1 is enhanced.
  • the reason why the drum length of the intermediate roll is larger than the maximum sheet width in this embodiment is that if the drum length of the intermediate roll is smaller than the maximum sheet width, the surface roughness of a portion of the work roll which is in contact with the intermediate roll will differ from that of a portion of the work roll which is not in contact with it, and as a result, the roughness of the sheet surface will be varied, thus damaging the surface quality of the strip sheet. This is particularly noticeable when the work roll is a dull roll.
  • the five-high rolling mill is astonishingly equipped with both the characteristic of a six-high rolling mill that the roll bending effect is apt to reach the center of the strip sheet and the characteristic of a four-high rolling mill that the roll bending effect is apt to be produced on the side end portions of the strip sheet.
  • the multi-high rolling mill which is capable of multiple bending control of the work rolls, efficient control of the shape of the strip sheet, and preventing the formation of edge wrinkles.
  • a rolling method of the multi-high rolling mill according to the present invention will be described hereinbelow.
  • the multi-high rolling mill including the upper and lower work rolls 1 and 2 of substantially the same diameter, the upper and lower backup rolls 3 and 4 supporting those work rolls 1 and 2, respectively, and the intermediate roll 5 located between one of the upper and lower work rolls 1, 2 and the associated backup roll 3, 4.
  • the roll bending devices 13 installed on the intermediate roll 5 and the roll bending devices 10 installed on the work roll in the roll set where the intermediate roll is disposed are both actuated to control the composite sheet crown of the strip sheet 6 in its entire width, and the roll bending devices 11 which are installed on the other work roll directly supported by the associated backup roll are actuated to control the sheet crown of the side end portions of the strip sheet 6.
  • the rolling method is arranged to perform both the composite shape control of the strip sheet and the control of the widths of the non-rolled side end portions of the strip sheet. Therefore, by properly combining the effects of the bending operations which have control characteristics different from each other, i.e., the effect of bending the intermediate roll which enables the bending control over the entire length of the roll and the effect of bending the work roll in the roll set where the intermediate roll is disposed which enables the bending control of the vicinities of the roll end portions, the sheet thickness in the entire width can be desirably controlled and thus, it is possible to provide the rolling method which can effect the composite shape control of the strip sheet even when the rolling operation is performed under the condition of a small rolling reduction.
  • the end portions of this work roll are largely bent to effectively control the thickness of the side end portions of the strip sheet 6 and reduce the widths of the non-rolled portions, and consequently, it is possible to provide the rolling method which can sufficiently prevent edge wrinkles from forming on the side end portions of the strip sheet.
  • the above description relates to the skinpass rolling mill, it should be noted that when the rolling mill is applied as a rolling mill of a small rolling force for materials such as copper and aluminum except iron, it is to effective that the composite shape control covering a wide range can be performed.
  • the present invention can provide a rolling method which has an excellent composite shape control for remarkably improving the surface quality of the strip sheet and which reduces the non-rolled portions in the vicinities of the sheet side ends for preventing the formation of edge wrinkles, thereby producing a great effect.

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

Claims (5)

  1. Procédé pour laminer une matière en tôle dans un laminoir à cinq cylindres à faible réduction d'épaisseur et faible force de laminage comportant des cylindres supérieur et inférieur de travail (1, 2) du même diamètre, des cylindres supérieur et inférieur d'appui (3, 5) supportant respectivement les cylindres de travail, un cylindre intermédiaire (5) situé entre un desdits cylindres de travail (1, 2) et le cylindre d'appui correspondant (3, 4) ayant un diamètre plus grand que celui des cylindres de travail et plus petit que celui des cylindres d'appui, et des dispositifs (10, 12, 13) de cintrage de cylindres installés sur lesdits cylindres de travail (1, 2) et sur ledit cylindre intermédiaire (5), ledit procédé étant
    caractérisé en ce que
    - les dispositifs (13) de cintrage de cylindres installés sur le cylindre intermédiaire (5) et les dispositifs (10) de cintrage de cylindres installés sur le cylindre de travail (1) supporté directement par le cylindre intermédiaire (5) créent tous ensemble des forces de cintrage croissantes pour déterminer un bombé de tôle composite de la matière laminée (6) sur toute sa largeur, et
    - les dispositifs (11) de cintrage de cylindres installés sur l'autre cylindre de travail (2) supporté directement par son cylindre d'appui correspondant créent une force de cintrage décroissante pour déterminer le bombé de tôle des extrémités latérales de la matière laminée (6),
    - réalisant de ce fait à la fois la détermination de la forme composite de la matière laminée et la détermination de la largeur des extrémités latérales de la matière laminée qui ne sont pas à laminer.
  2. Procédé de laminage selon la revendication 1,
       caractérisé en ce que
       lesdits dispositifs (10, 12, 13) de cintrage de cylindres sont actionnés pendant une passe de laminage dans les conditions d'une faible réduction d'épaisseur par laminage et d'une faible force de laminage.
  3. Procédé de laminage selon la revendication 1 ou 2,
       caractérisé en ce que
       les dispositifs de cintrage (10, 13) agissant sur le cylindre intermédiaire (5) et sur son cylindre de travail correspondant (1) sont actionnés individuellement.
  4. Procédé de laminage selon les revendications 1 à 3,
       caractérisé en ce que
       le cylindre intermédiaire (5), le cylindre de travail (1) associé audit cylindre intermédiaire et l'autre cylindre de travail (2) associé au cylindre d'appui (4) sont respectivement commandés par leurs dispositifs de cintrage (10, 12, 13) avec des valeurs progressivement croissantes de degrés n de commande.
  5. Procédé de laminage selon les revendications 1 à 4,
       caractérisé en ce que
       le bombé de tôle composite de la matière laminée (6) sera déterminé par la forme d'un seul cylindre d'appui (3) ou par la longueur de partie cylindrique du cylindre intermédiaire (5).
EP90110143A 1989-05-31 1990-05-29 Procédé de laminage dans un laminoir à cinq cylindres Expired - Lifetime EP0400568B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP136052/89 1989-05-31
JP13605289 1989-05-31
JP242162/89 1989-09-20
JP1242162A JPH082453B2 (ja) 1989-05-31 1989-09-20 ５段圧延機，多段圧延機，調質圧延機及び多段圧延機の圧延方法

Publications (3)

Publication Number Publication Date
EP0400568A2 EP0400568A2 (fr) 1990-12-05
EP0400568A3 EP0400568A3 (fr) 1993-01-27
EP0400568B1 true EP0400568B1 (fr) 1997-08-13

Family

ID=26469736

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90110143A Expired - Lifetime EP0400568B1 (fr) 1989-05-31 1990-05-29 Procédé de laminage dans un laminoir à cinq cylindres

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EP (1) EP0400568B1 (fr)
DE (1) DE69031246T2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108723089A (zh) * 2018-04-27 2018-11-02 马兴法 一种异形环毛坯的轧辊装置
CN118180163A (zh) * 2024-02-05 2024-06-14 南京钢铁股份有限公司 一种五辊张力机辊用自控方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5366849A (en) * 1976-11-26 1978-06-14 Hitachi Ltd Rolling machine
JPS54121263A (en) * 1978-03-15 1979-09-20 Ishikawajima Harima Heavy Ind Co Ltd Roll bending device for rolling mill
JPS56154206A (en) * 1980-05-01 1981-11-28 Ishikawajima Harima Heavy Ind Co Ltd Different speed rolling mill provided with function of controlling crown

Also Published As

Publication number Publication date
EP0400568A3 (fr) 1993-01-27
EP0400568A2 (fr) 1990-12-05
DE69031246T2 (de) 1998-01-15
DE69031246D1 (de) 1997-09-18

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