EP0543014B1 - Sechs-walzen-walzwerk - Google Patents

Sechs-walzen-walzwerk Download PDF

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Publication number
EP0543014B1
EP0543014B1 EP92910178A EP92910178A EP0543014B1 EP 0543014 B1 EP0543014 B1 EP 0543014B1 EP 92910178 A EP92910178 A EP 92910178A EP 92910178 A EP92910178 A EP 92910178A EP 0543014 B1 EP0543014 B1 EP 0543014B1
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EP
European Patent Office
Prior art keywords
roll
rolls
rolling mill
crown
sheet
Prior art date
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Application number
EP92910178A
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English (en)
French (fr)
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EP0543014A4 (de
EP0543014B2 (de
EP0543014A1 (de
Inventor
Toshiki Kawasaki Steel Corporation Hiruta
Kunio Kawasaki Steel Corporation Kitamura
Ikuo Kawasaki Steel Corporation Yarita
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JFE Steel Corp
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Kawasaki Steel Corp
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • 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
    • B21B2013/028—Sixto, six-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips
    • B21B2027/022—Rolls having tapered ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/18—Roll crown; roll profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/02—Roll bending; vertical bending of rolls
    • B21B2269/04—Work roll bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/02—Roll bending; vertical bending of rolls
    • B21B2269/06—Intermediate roll bending
    • 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
    • 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
    • B21B2269/16—Intermediate rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally

Definitions

  • This invention relates to a hot rolling mill and is concerned with a hot finish rolling mill for hot rolling a sheet bar rolled by a rough rolling mill to a product thickness or to a six high rolling mill for cold rolling strip sheet rolled by a hot finish rolling mill, in particular, to precisely control the sheet crown which is defined as the difference in the sheet thickness between a central portion of the sheet width and portions in the vicinity of edges, thereby preventing the sheet edges from becoming extremely thin because of edge drop.
  • the rolls of the mill are deflected due to the rolling load, thereby the sheet thickness at the central portion of the sheet width becomes greater than the sheet thickness at portions in the vicinity of the opposite edges of the rolled sheet, that is a sheet crown is formed in the rolled sheet.
  • the sheet crown if the sheet crown becomes large, makes it difficult to provide an adequate sheet profile when cold rolling in the next step, which also results in shape deficiency and unavoidably results in a reduction in yield.
  • JP-B-62-10722 discloses a six high rolling mill to be installed in a post-stage stand, wherein a rolling mill array includes intermediate rolls having a constant diameter over the full length thereof arranged between backup rolls and work rolls, respectively, and these intermediate rolls are adapted to shift in mutually opposite axial directions, whereby the ability to control the sheet crown is enhanced.
  • JP-A-57-91807 discloses a rolling mill in which an S-shaped crown is formed on any one of a work roll, an intermediate roll or a backup roll, and the roll having the S-shaped crown is shifted in the axial direction, whereby the ability for controlling the sheet crown is enhanced.
  • the length of the intermediate roll is made approximately the same as the lengths of the backup roll and the work roll, so that when the intermediate roll is shifted in order to make the sheet crown small, the length of contact of the intermediate roll with the backup roll and the work roll becomes short, and the mill rigidity of the rolling mill decreases.
  • the roll gap between the pair of work rolls greatly changes, and no predetermined accuracy in the sheet thickness can be provided.
  • This invention solves all such problems in the prior art and provides a six high rolling mill adapted for controlling both the sheet crown and edge drop of the sheets to prevent a decrease in mill rigidity of the rolling mill and meander of the sheet resulting from great shifting of the intermediate roll and to attain an increase in service life of the rolls.
  • the barrel length of the work roll is longer than that of the intermediate roll and preferably 1.4 to 2.5 times longer than that of the intermediate roll.
  • the work roll may be provided with a roll crown having a shape such as a one side taper shape where the barrel diameter is gradually reduced towards one end of the roll barrel or a two side taper shape where the barrel diameter is gradually reduced towards the opposite ends from the center of the barrel length.
  • the six high rolling mill according to the invention is able to reduce the load affected between rolls, in particular, the barrel end portions of the intermediate and work rolls by providing the roll crown for the intermediate rolls, thereby improving the ability to control the crown.
  • the "S" shaped roll crown can effectively reduce the rolling load applied on both edge portions of the sheet, and when the intermediate rolls are respectively shifted in the opposite directions relative to each other in the point symmetry relationship, the aforementioned function is more remarkably attained and as a result a greater crown control ability can be attained.
  • the intermediate roll since the intermediate roll has a barrel length longer than that of the backup roll as mentioned above, even if the intermediate roll is greatly shifted, the intermediate roll can always effectively contact the backup roll over the full length thereof so that the mill rigidity of the rolling mill is effectively prevented from decreasing due to profile control. Therefore accuracy of the sheet thickness is greatly improved without being affected by variation in the width of the sheet to be rolled. Furthermore, even if the sheet to be rolled has camber, the sheet is subjected to uniform reduction through the whole sheet width so that the occurence of meander can be effectively reduced.
  • the roll barrel of the intermediate roll had a length which was the same as the roll barrel of the backup roll, it would be necessary to use a large roll crown so as to provide a large difference between the maximum diameter and minimum diameter of the roll barrel of the intermediate roll in order to attain the necessary crown control.
  • the contact pressure generated between contacting rolls increases and causes spalling on the surfaces of the rolls and also reduce the service life of the rolls.
  • the sheet bar has a relatively narrow width and the rolling load is small, non-contact portions are generated between the barrels of the intermediate and backup rolls or between the barrels of the intermediate and work rolls.
  • the mill rigidity of the rolling mill reduces and as a result , the desired accuracy of the sheet thickness can not be obtained. Therefore, in order to remove the aforementioned problems, the barrel length of the intermediate roll is 1.2 ⁇ 2.5 times as long as the barrel length of the back up roll.
  • each work roll is preferably longer than that of the intermediate roll, and advantageously the line barrel length of the work roll is 1.4 ⁇ 2.5 times as long as the intermediate roll so that the work roll always effectively contacts the intermediate roll in spite of shifting of the intermediate roll to improve the mill rigidity of the rolling mill and particularly reduce meandering of the sheet.
  • the service life of the roll is improved by increasing the contact range between the rolls and by preventing the contact pressure between the rolls from increasing.
  • Fig. 1 illustrates a six high rolling mill according to the present invention.
  • a housing 1 is provided with pairs of upper and lower work rolls 2, intermediate rolls 3 and backup rolls 4, respectively. Both work rolls 2 are capable of being shifted in mutually opposite directions along their axes by means of shifting units 5 for each of them. Both intermediate rolls 3 are also capable of being shifted in mutually opposite directions along their axes by means of other shifting units 6 for each of them.
  • Each of the backup rolls 4 is constituted by a so-called plain roll having a constant barrel diameter throughout its entire length, and each of the intermediate rolls 3 is constituted by a roll having a barrel length longer than that of the backup roll and a "S" shaped roll crown.
  • the "S" shaped roll crown of the intermediate rolls has a difference between maximum and minimum roll diameters not larger than 1mm.
  • the intermediate rolls 3 with such a roll crown are arranged in mutually opposite positions as shown in Fig. 1 and shifted in mutually opposite directions between the maximum and minimum shift positions shown in Fig. 3(a) and (b) by means of shifting units 6.
  • one barrel end 3a of the intermediate roll 3 is just aligned to one barrel end 4a of its backup roll 4, while in the maximum shift position shown in Fig. 3(b) the other barrel end 3b of the intermediate roll 3 is just aligned to the other barrel end 4b of its backup roll 4.
  • the intermediate rolls contact their respective backup rolls along the full length of the backup rolls at the maximum and minimum shifted positions.
  • the work rolls 2 are plain rolls having a constant diameter and having the same barrel length as that of the backup rolls.
  • each of the work rolls 2 is connected to a reduction gear 10, attached to a motor 9, successively by means of a spindle 7 and a pinion stand 8.
  • the shifting position of the work roll 2 (caused by the shifting unit 5, connected to the work roll 2 through the spindle 7 and the pinion stand 8) is detected by a position detecting unit 11 which can be, for example, a magnet scale
  • the shifting position of the intermediate roll 3 (caused by the shifting unit 6 connected to the intermediate roll 3) is detected by another position detecting unit 12 which can be also, for example, a magnet scale.
  • 13, 14 and 15 denote a rolled sheet as a product, a work roll bender and an intermediate roll bender, respectively, and 16 indicates a load cell.
  • Fig. 4 is a diagrammatic view of a control system of the rolling mill as described above.
  • 21 indicates an arithmetic unit, and into this arithmetic unit 21 are inputted beforehand rolling conditions in one cycle such as the shape and size of any tapered portion of the work roll 2, the roll crown and size of the intermediate roll 3, the sheet width, the draft at each roll stand, the sheet finish thickness, the target sheet crown, the target sheet shape and the like, and the arithmetic unit 21 calculates the setting values for the shifting amount of the intermediate roll 3 and the bending force of each of the roll benders 14 and 15 on the basis of such information and the cyclic shifting amount of the work roll 2 in order to provide a sheet crown and a sheet shape as required by the target.
  • each of a shifting control unit 22 and a bender control unit 23 controls the operations of the shifting unit 6 and the roll benders 14 and 15 so that the shifting amount of the intermediate roll 3 and the roll bending force are used as setting values to wait for the start of rolling in such a state.
  • the arithmetic unit 21 calculates corrected values of the intermediate roll shifting amount and the roll bending force, and the shifting control unit 22 and bender control unit 23 adjust the shift amount of the intermediate roll 3 and the bending force of the roll benders 14, 15 in accordance with the correction values.
  • Composite roll crown CR formed by the upper and lower intermediate rolls can be expressed by the following equation (4), wherein the mill center is set to be zero (0).
  • the maximum shift amount ⁇ max to give the maximum composite roll crown can be expressed as follows.
  • ⁇ max L - L B where L B : 1/2 of the barrel length of the backup roll.
  • the minimum crown amount may be when the composite crown of the upper and lower rolls is zero.
  • the maximum and minimum diameter differences of the intermediate roll can be made small, that is, when an S-shaped roll crown is formed on the intermediate roll, the grinding amount can be reduced, so that the life of the intermediate roll can be lengthened in the process of roll grinding.
  • the barrel length is 1.5L B (solid line)
  • the work roll is bent along the intermediate roll, so that the sheet crown is reduced as compared with a case in which the barrel crown is 1.1L B .
  • Table 1 it is apparent that the maximum pressure is smaller when the barrel length is 1.5L B , so that it contributes to improve the roll life.
  • Length of intermediate roll Line pressure (kgf/mm) between intermediate and backup rolls Line pressure (kgf/mm) between intermediate and work rolls 1.5L B 911 986 1.1L B 1140 1155
  • the barrel length of the work roll used was 2300 mm, its diameter was 680 mm, the barrel length of the backup roll used was 2300 mm, and its diameter was 1330 mm.
  • the barrel length of the intermediate roll was variously changed in which the third order coefficient "a" of equation (8) was 0.833. Sheet bars, having a width of 1500 mm and a thickness of 5.2 mm, were rolled to a thickness of 4.16 mm, and various investigations were made.
  • Fig. 6 shows the relationship between the ratio (L/L B ) of the intermediate and backup roll barrel lengths, and the maximum pressure between the intermediate and backup rolls. As shown in the drawing, when the ratio (L/L B ) is increased to not less than 1.2 times, the pressure is gently lowered, so that it is apparent that an intermediate roll of long barrel length is favorable.
  • Fig. 7 shows the contact condition between the intermediate and backup rolls with respect to the ratio of barrel length under the condition that the same sheet crown is obtained.
  • the ratio is increased to not less than 1.2 times, the occurrence of a non-contact region can be prevented, and it is effective to improve the sheet thickness accuracy and to inhibit the occurrence of sheet meander and reduction ears.
  • a deflection is generated in the intermediate roll 3 as shown in Fig. 8(a).
  • Fig. 9 shows the relationship between the horizontal deflection amount t and the ratio (L/L B ) of the barrel length of the intermediate and backup rolls under the condition that the aforementioned gap is 3 mm, wherein the maximum displacement amount t between the chocks shown in Fig. 8(b) is defined as the horizontal deflection amount.
  • the intermediate roll length is preferred to be short.
  • the horizontal bending amount is to the extent of 0.45 mm, it has little influence on the sheet crown and profile, so that it causes no problem in a normal rolling operation.
  • the aforementioned gap is usually controlled to be not more than 3 mm. Therefore, it is apparent that when the barrel of the intermediate roll is not more than 2.5 times as long as the backup roll, the rolling can be carried out.
  • a comparative example will be explained as follows in which a crown distribution with respect to the number of rolled sheets and others were investigated when using a rolling mill according to the present invention and also when using a conventional rolling mill.
  • the barrel length of the work rolls was 2300 mm
  • that of the intermediate roll was 3450 mm
  • that of the backup roll was 2300 mm.
  • the difference between the maximum and minimum diameters of the intermediate roll was 0.8 mm, and the intermediate roll was shifted within a range from 0 mm to 700 mm.
  • each six high mill had work rolls, intermediate rolls and backup rolls, all of them being plain rolls and all having a barrel length of 2300 mm.
  • the intermediate rolls were shifted, and rolling operations were carried out in the same manner as the rolling mill of the invention, and the sheet crown was measured in the same manner.
  • the rolling mill of the present invention when used, it is apparent that it was possible to carry out a highly accurate sheet rolling operation to obtain a sheet crown close to the target sheet crown out even when the target crown was changed.
  • the rolling schedule with respect to the sheet width of the rolling mill of the present invention was set to be the same as that of the rolling mill of the prior art.
  • lubricant supplying nozzles 26 are arranged to direct lubricant from these nozzles to a gap between the backup roll 4 and the intermediate roll 3 and to a gap between the intermediate roll 3 and the work roll 2.
  • the lubricant is supplied to the lubricant supplying nozzles 26 by supply pipes 29 from a lubricant tank 27 by means of a pump 28.
  • coolant is supplied to the intermediate rolls 3 and the work rolls 2 from cooling nozzles 32 by coolant supply pipes 31 and a coolant pump 30.
  • the preferred lubricant is a highly concentrated emulsion of basic oil including a high pressure agent, but when the lubricant is also used for cooling the rolls, a lubricant having a low concentration may be used.
  • the distance between the lubricant supply nozzles 26 for the barrel portion of the intermediate roll 3 having the larger diameter is preferably smaller than that for the barrel portion having the smaller diameter to increase the amount of lubricant supplied.
  • the concentration of the lubricant may be varied in the axial direction of the intermediate roll to obtain the same effect as mentioned above.
  • the rolling mill shown in Fig. 1 was used to roll the sheet bars mentioned above using a 10% emulsion as lubricant and, as coolant, industrial water in a manner as shown in Fig. 11 and at least 120 strips were rolled without roll seizure occurring.
  • the sheet bars were rolled in the same manner as mentioned above but using only industrial water as coolant. In this case roll seizure occurred on the work roll and the intermediate roll when 100 strips had been rolled and the rolling operation was stopped.
  • a rolling mill including an intermediate roll provided with roll crown
  • distribution of the contact pressure between rolls is varied to vary the bending of the work roll, thereby controlling the sheet crown, and therefore the shape of the sheet.
  • the amount of crown control is not varied by the change of rolling load. Accordingly, when the diameter of the work roll is small, the deflection amount of the center line of the work roll is greatly varied so that the amount of crown control generated by shifting the intermediate roll becomes large. While, when the diameter of the work roll is large, change in the deflection amount of the center line of the work roll is small so that the amount of crown control generated by shifting the intermediate roll becomes small.
  • Results of test carried on rolled sheets of 1500 mm width with respect to the diameter of the work roll and the amount of crown control are shown in Fig. 13.
  • the diameter of the work roll is small, preferably not more than 700 mm
  • the amount of crown control becomes large
  • the diameter of the work roll is smaller than 400 mm
  • the amount of horizontal bending of the work roll becomes large and the roll profile becomes wrong.
  • the work roll is difficult to drive and the affect caused by bending of the work roll is decreased. Accordingly, a work roll of a diameter of at least 400 mm is desirable.
  • Fig. 14 shows a rolling mill having improved rigidity by extending the roll barrel of the work roll 2 to make its barrel length longer than that of the intermediate roll 3 in the six high rolling mill shown in Fig. 1.
  • the mill rigidity of the rolling mill is determined by the size of the gap between the work rolls when the rolling load is changed.
  • the gap is influenced by the deflection of the backup rolls, the elastic deformation of the housing etc., and the flat deformation between the rolls.
  • the mill rigidity of the rolling mill is great since the contacting pressure between the rolls is smaller than in the case of a shorter contacting region even if the rolling load is changed.
  • the barrel length of the work roll is long, even if the sheet passes in a position deviated from the center of the rolling mill, the variation in the pressure between the rolls is small and the difference between the amounts of deformation at the left and right side with respect to the center line of the sheet is small. Accordingly the use of a work roll having a long barrel length is effective for preventing sheet meander and the occurence of reduction ears.
  • a preferred range of the barrel length of the intermediate roll is 1.5 ⁇ 2.5 times as long as that of the backup roll as described above, and this is for substantially the same reason.
  • the barrel length of the work roll was 3400 mm
  • that of the intermediate roll was 3000 mm
  • that of the backup roll was 2300 mm.
  • the difference between the maximum and minimum diameters of the intermediate roll was 0.8 mm, and the intermediate roll was shifted within a range of from 0 mm to 700 mm.
  • a cold rolling mill train consisting of four rolling stands in which the six high rolling mills structured as shown in Fig. 1 were arranged in the first rolling stand, sheet bars of 900 to 1600 mm width and 2 ⁇ 3 mm thickness, were rolled to obtain a low carbon steel thin sheet of 1.6 to 0.5 mm finished thickness, and then the sheet thickness deviation was investigated at a position spaced from the edge by 100 mm.
  • the barrel length of the work roll was 2000 mm
  • that of the intermediate roll was 2700 mm
  • that of the backup roll was 2000 mm.
  • the difference between the maximum and minimum diameters of the intermediate roll was 0.8 mm and the intermediate roll was shifted within a range of from 0 mm to 700 mm.
  • a six high mill was arranged in the first rolling stand and provided with work rolls, intermediate rolls and backup rolls, all of them being plain rolls and having a barrel length of 2000 mm. While the intermediate rolls were shifted, rolling operations were carried out in the same manner as the rolling mill of the invention, and the sheet thickness deviation was measured in the same manner.
  • the frequency of occurence of reduction ears and the amount of edge drop are shown in Table 4 in the case where 100,000 tons of sheets were rolled using the aforementioned rolling mill of the invention and the conventional rolling mill. According to this table, both the sheet thickness accuracy and the pass property (decrease in the occurrence of reduction ears) of the rolling mill of the invention are far superior to those of the conventional rolling mill.
  • the amount of edge drop is defined by thickness deviations at positions spaced from the edge by 100 mm and 7.5 mm.
  • Amount of edge drop ( ⁇ m) Frequency of ears (time) Inventive rolling mill 12 0 Conventional rolling mill 15 3
  • the six high rolling mill should be arranged in the first stand, and preferably six high rolling mills are applied for the rear stands in order from the first stand.
  • the strip sheet is subjected to a tension between the stands of the cold rolling mill train so that meander of the sheet is restrained, but if the hot rolled sheet has a large camber and wedge, reduction ear sometimes occurs owing to the camber and wedge.
  • the intermediate roll has a long roll barrel to ensure mill rigidity so that it is possible to prevent the occurence of reduction ear in the sheet.
  • Fig. 17 illustrates a six high rolling mill in which the intermediate rolls 3 are provided with the "S" shape roll crowns, respectively, and the work rolls 2 are provided with one side taper shape roll crowns.
  • edge drop can be modified by regulating the distance EL from the starting point of the tapered portion 2a to the edge of the sheet (referring to Fig. 18) so that the edge drop can be controlled in accordance with a predetermined target amount of edge drop.
  • a comparative test was carried out in which the crown distribution with respect to the number of rolled sheets etc. were using a rolling mill according to the present invention and also using a conventional rolling mill.
  • the barrel lengths of the work roll and backup roll were 2300 mm respectively, and that of the intermediate roll was 3000 mm.
  • the difference between the maximum and minimum diameters of the "S" shape roll crown formed on the intermediate roll was 0.8 mm, the tapered portion 2a of the work roll was tapered by a 8 ⁇ 10 -3 (0.16 mm/200 mm per diameter) and the intermediate roll was shifted within a range of from 0 mm to 700 mm.
  • a rolling mill train six high mills were arranged in three rolling stands in the rear stage including the final rolling stand. Each six high mill was provided with work rolls, intermediate roll and backup rolls, all of them being plain rolls and all having a barrel length of 2300 mm. While the intermediate rolls were being shifted, rolling operations were carried out in the same manner as the rolling mill of the invention, and the sheet crown was measured in the same manner.
  • a cold rolling mill train consisting of four rolling stands in which the six high rolling mills structured as shown in Fig. 17 were arranged in the first rolling stand, sheet bars of 900 to 1600 mm width and 2 ⁇ 3 mm thickness, were rolled to obtain a low carbon steel thin sheet of 0.5 mm finished thickness, and then the sheet thickness deviation was investigated at a position spaced from the edge by 100 mm.
  • the barrel length of the work roll was 2000 mm
  • that of the intermediate roll was 2700 mm
  • that of the backup roll was 2000 mm.
  • the difference between the maximum and minimum diameters of the intermediate roll was 0.8 mm, and the intermediate roll was shifted within a range of from 0 mm to 700 mm.
  • a six high mill was arranged in the first rolling stand and provided with work rolls, intermediate rolls and backup rolls, all of them being plain rolls and all having a barrel length of 2000 mm. While the intermediate rolls were being shifted, rolling operations were carried out in the same manner as the rolling mill of the invention, and the sheet thickness deviation was measured in the same manner.
  • Fig. 22 illustrates a rolling mill similar to the six high rolling mill shown in Fig. 17, except that each of the work rolls 2 is provided with a roll crown tapered towards opposite ends.
  • a comparative test was carried out in which the crown distribution with respect to the number of rolled sheets etc. were investigated using a rolling mill according to the present invention and also using a conventional rolling mill.
  • the opposite tapered barrel portions 2a and 2b of the work roll were tapered by 0.4 ⁇ 10 -3 (0.08 mm/200 mm per diameter). Also, the difference between the maximum and minimum diameters of the intermediate roll was 0.8 mm, and the intermediate roll was shifted within a range of from 0 mm to 700 mm.
  • the specification of the conventional rolling mill used in this comparative test was the same as in the case of Example 4.
  • Fig. 24 illustrates a rolling mill similar to the six high rolling mill shown in Fig. 22, except that the barrel length of the work roll 2 is longer than that of the intermediate roll 3.
  • a comparative test was carried out in which the crown distribution with respect to the number of rolled sheets etc were investigated using a rolling mill according to the present invention and also using a conventional rolling mill.
  • the barrel length of the work roll was 3400 mm
  • that of the intermediate roll was 3000 mm
  • that of the backup roll was 2300 mm.
  • the intermediate roll was shifted within a range of from 0 mm to 700 mm.
  • the conventional rolling mill train used in this comparative test had six high mills arranged in three rolling stands in the rear stage including the final rolling stand. Each six high mill had work rolls, intermediate rolls and backup rolls, all of them being plain rolls and all having a barrel length of 2300 mm.
  • Fig. 26 illustrates a rolling mill similar to the six high rolling mill shown in Fig. 24, except that each of the work rolls 2 is provided with a roll crown tapered toward opposite ends.
  • a comparative test was carried out in which the crown distribution with respect to the number of rolled sheets etc. were investigated using a rolling mill according to the present invention and also using a conventional rolling mill.
  • the opposite tapered barrel portions 2a and 2b of the work roll were tapered by 0.8 ⁇ 10 -3 (0.16 mm/200 mm per diameter) and 0.01 ⁇ 10 -3 (0.02 mm/200 mm per diameter), respectively, and the intermediate roll was shifted within a range of from 0 mm to 700 mm.
  • the specification of the conventional rolling mill used in this comparative test was the same as in the case of Example 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)

Claims (6)

  1. Sechswalzen-Walzgerüst, umfassend obere und untere Arbeitswalzen (2), ein Paar Zwischenwalzen (3) und ein Paar Stützwalzen (4), wobei zumindest die Zwischenwalzen und die Arbeitswalzen so eingerichtet sind, daß sie in Richtung ihrer Achsen verschiebbar sind, und die Zwischenwalzen Balligkeiten aufweisen, die punktsymmetrisch bezüglich des Gerüstmittelpunkts sind, und die Arbeitswalzen Walzenprofile aufweisen, die punktsymmetrisch bezüglich des Gerüstmittelpunkts sind,
       dadurch gekennzeichnet, daß das Walzenprofil einer der Zwischenwalzen (3) durch die folgende Gleichung (1) dritten Grades ausdrückbar ist y1(x) = -a[{x - (δ + OF)}/L]3 + b(x/L) wobei gilt:
    y1 ist die Erzeugende der Walzenballigkeit,
    a ist der Koeffizient des Terms dritter Ordnung,
    b ist der Koeffizient des Terms erster Ordnung,
    x ist die Koordinate der Ballenmitte,
    L ist die Hälfte der Ballenlänge der Zwischenwalze,
    δ ist die Größe der Verschiebung der Zwischenwalze relativ zu einem Anfangspunkt, für den x = LB gilt, und
    OF ist die Versatzgröße in Achsenrichtung;
    und dadurch, daß das Walzenprofil der anderen Zwischenwalze durch die folgende Gleichung (2) dritten Grades ausdrückbar ist y2(x) = -a[{x + (δ + OF)}/L]3 + b(x/L) wobei y2 die Erzeugende der Walzenballigkeit ist;
    und dadurch, daß jede der Zwischenwalzen eine Ballenlänge hat, die 1,2 - 2,5mal länger ist als die ihrer Stützwalze, so daß die Zwischenwalzen in ihrer größten und kleinsten Verschiebestellung die Stützwalzen stets auf ihrer gesamten Länge berühren.
  2. Sechswalzen-Walzgerüst nach Anspruch 1, wobei jede Arbeitswalze (2) eine Glattwalze ist, die einen konstanten Durchmesser aufweist.
  3. Sechswalzen-Walzgerüst nach Anspruch 1 oder 2, wobei sowohl die untere als auch die obere Arbeitswalze (2) eine einseitig konische Walzenballigkeit aufweist, die von einem Ballenende zum anderen konisch verläuft.
  4. Sechswalzen-Walzgerüst nach Anspruch 1 oder 2, wobei sowohl die untere als auch die obere Arbeitswalze (2) eine doppelseitig konische Walzenballigkeit aufweist, die von einem Mittenbereich des Walzenballens zu den Ballenenden verläuft.
  5. Sechswalzen-Walzgerüst nach irgendeinem der Ansprüche 1 bis 4, wobei die Ballenlänge einer jeden Arbeitswalze (2) größer ist als die der Zwischenwalzen (3).
  6. Sechswalzen-Walzgerüst nach Anspruch 5, wobei die Ballenlänge einer jeden Arbeitswalze (2) 1,4 - 2,5fach länger ist als die der Zwischenwalzen (3).
EP92910178A 1991-05-16 1992-05-18 Sechs-walzen-walzwerk Expired - Lifetime EP0543014B2 (de)

Applications Claiming Priority (25)

Application Number Priority Date Filing Date Title
JP139431/91 1991-05-16
JP139428/91 1991-05-16
JP13943191 1991-05-16
JP13943191 1991-05-16
JP13942891 1991-05-16
JP13942891 1991-05-16
JP144152/91 1991-05-21
JP14415291 1991-05-21
JP14415291 1991-05-21
JP18946991 1991-07-04
JP18946891 1991-07-04
JP18946791 1991-07-04
JP18946991 1991-07-04
JP18946891 1991-07-04
JP189468/91 1991-07-04
JP18946791 1991-07-04
JP18947091 1991-07-04
JP189467/91 1991-07-04
JP189470/91 1991-07-04
JP189469/91 1991-07-04
JP18947091 1991-07-04
JP94292 1992-01-07
JP94292 1992-01-07
JP942/92 1992-01-07
PCT/JP1992/000639 WO1992020471A1 (fr) 1991-05-16 1992-05-18 Laminoir a six etages

Publications (4)

Publication Number Publication Date
EP0543014A1 EP0543014A1 (de) 1993-05-26
EP0543014A4 EP0543014A4 (de) 1995-05-24
EP0543014B1 true EP0543014B1 (de) 1998-08-19
EP0543014B2 EP0543014B2 (de) 2004-10-27

Family

ID=27571416

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92910178A Expired - Lifetime EP0543014B2 (de) 1991-05-16 1992-05-18 Sechs-walzen-walzwerk

Country Status (6)

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EP (1) EP0543014B2 (de)
JP (1) JP2654313B2 (de)
KR (1) KR100216299B1 (de)
CA (1) CA2087156C (de)
DE (1) DE69226690T3 (de)
WO (1) WO1992020471A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
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WO2014191671A1 (fr) 2013-05-28 2014-12-04 Fives Dms Procédé de changement de configuration d'un laminoir et laminoir pour la mise en oeuvre du procédé

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004020131A1 (de) * 2003-12-19 2005-07-21 Sms Demag Ag Kombinierte Fahrweisen und Gerüsttypen in Kalttandemstraßen
DE102004020132A1 (de) * 2003-12-23 2005-07-28 Sms Demag Ag Verfahren und Walzgerüst zur mehrfachen Profilbeeinflussung
WO2006029770A1 (de) 2004-09-14 2006-03-23 Sms Demag Ag Konvexwalze zur beeinflussung von profil und planheit eines walzbandes
BR112012027654B1 (pt) * 2011-09-20 2018-03-13 Mitsubishi-Hitachi Metals Machinery, Inc. Laminador a frio para laminar uma tira de aço, sistemas de laminação em tandem e de laminação inversor, e, métodos de modificação de um sistema de laminação e operacional de um laminador a frio
JP6470134B2 (ja) 2015-07-08 2019-02-13 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 圧延機および圧延方法
JP7342831B2 (ja) * 2020-09-29 2023-09-12 Ｊｆｅスチール株式会社 熱間圧延機及び熱延鋼板の製造方法

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220018B2 (de) * 1973-05-16 1977-06-01
JPS5413442A (en) * 1977-07-01 1979-01-31 Hitachi Ltd Rolling mill series for controlling sheet crown and shape
JPS5944125B2 (ja) * 1978-08-03 1984-10-26 新日本製鐵株式会社 ６段圧延機
JPS55161512A (en) * 1979-06-06 1980-12-16 Hitachi Ltd Roll shifter for rolling mill
JPS573401U (de) * 1980-06-09 1982-01-08
JPS6018243B2 (ja) * 1980-07-07 1985-05-09 株式会社日立製作所 圧延ロ−ル
DE3038865C1 (de) † 1980-10-15 1982-12-23 SMS Schloemann-Siemag AG, 4000 Düsseldorf Walzgeruest mit axial verschiebbaren Walzen
DE3213496A1 (de) * 1982-04-10 1983-10-20 SMS Schloemann-Siemag AG, 4000 Düsseldorf Walzgeruest mit axial verschiebbaren walzen
JPS5956905A (ja) * 1982-09-28 1984-04-02 Kawasaki Steel Corp 調質圧延用６段圧延機
DE3602698A1 (de) * 1985-04-16 1986-10-16 SMS Schloemann-Siemag AG, 4000 Düsseldorf Walzgeruest mit axial verschiebbaren walzen
JPS62151203A (ja) * 1985-12-25 1987-07-06 Kawasaki Steel Corp 板材の圧延方法
JPH0688053B2 (ja) * 1986-05-30 1994-11-09 川崎重工業株式会社 圧延方法
JPS6316802A (ja) * 1986-07-10 1988-01-23 Kawasaki Heavy Ind Ltd 圧延方法
JPS6360006A (ja) * 1986-08-29 1988-03-16 Kawasaki Heavy Ind Ltd 圧延スタンド
DE3638331C2 (de) * 1986-11-10 1995-07-13 Schloemann Siemag Ag Walzgerüst zum Walzen von Flachmaterial mit einem Paar von axial verschiebbaren Arbeitswalzen
DE3712043C2 (de) † 1987-04-09 1995-04-13 Schloemann Siemag Ag Walzgerüst mit axial verschiebbaren Walzen
JPH01118804U (de) * 1988-02-01 1989-08-11
JPH0313220A (ja) * 1989-06-09 1991-01-22 Kawasaki Steel Corp 圧延機
JPH03294006A (ja) * 1990-04-11 1991-12-25 Kawasaki Steel Corp 熱間仕上圧延機及び熱間仕上圧延機列

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014191671A1 (fr) 2013-05-28 2014-12-04 Fives Dms Procédé de changement de configuration d'un laminoir et laminoir pour la mise en oeuvre du procédé
US10195652B2 (en) 2013-05-28 2019-02-05 Fives Dms Method for changing the configuration of a rolling mill and rolling mill for the implementation of said method

Also Published As

Publication number Publication date
WO1992020471A1 (fr) 1992-11-26
EP0543014A4 (de) 1995-05-24
CA2087156A1 (en) 1992-11-17
DE69226690D1 (de) 1998-09-24
EP0543014B2 (de) 2004-10-27
KR100216299B1 (ko) 1999-08-16
CA2087156C (en) 2000-12-26
KR930701244A (ko) 1993-06-11
JP2654313B2 (ja) 1997-09-17
EP0543014A1 (de) 1993-05-26
DE69226690T3 (de) 2005-02-10
DE69226690T2 (de) 1999-01-07
JPH05245506A (ja) 1993-09-24

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