CA2018261C - Multi-roll cluster rolling apparatus - Google Patents
Multi-roll cluster rolling apparatusInfo
- Publication number
- CA2018261C CA2018261C CA002018261A CA2018261A CA2018261C CA 2018261 C CA2018261 C CA 2018261C CA 002018261 A CA002018261 A CA 002018261A CA 2018261 A CA2018261 A CA 2018261A CA 2018261 C CA2018261 C CA 2018261C
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- CA
- Canada
- Prior art keywords
- rolls
- roll
- pair
- crown
- imparted
- 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 - Fee Related
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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
- B21B1/42—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 step-by-step or planetary 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
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
-
- 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
- B21B13/147—Cluster mills, e.g. Sendzimir mills, Rohn mills, i.e. each work roll being supported by two rolls only arranged symmetrically with respect to the plane passing through the working rolls
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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)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Metal Rolling (AREA)
Abstract
A multi-roll cluster rolling apparatus has a pair of work rolls, and a plurality of first intermediate rolls, a plurality of second intermediate rolls and a plurality of backup rolls arranged successively in the mentioned order behind each the work roll. A roll crown presented by unidirectinally tapering one end of a roll is imparted to at least a pair of rolls. e.g., the work rolls, selected from a roll group consisting of the work rolls, first intermediate rolls and the second intermediate rolls. A
roll crown approximated by at least one-pitch portion of a waveform is imparted to at least one other pair of rolls, e.g., pairs of the first intermediate rolls. A roll crown approximated by at least two-pitch portion of a waveform is imparted to at least one of the remainder pairs of rolls, e.g.,selected pairs of the second intermediate rolls. The rolls of each pair having the same roll crown arranged arranged in opposite axial directions and are axially shiftably mounted on a mill housing.
roll crown approximated by at least one-pitch portion of a waveform is imparted to at least one other pair of rolls, e.g., pairs of the first intermediate rolls. A roll crown approximated by at least two-pitch portion of a waveform is imparted to at least one of the remainder pairs of rolls, e.g.,selected pairs of the second intermediate rolls. The rolls of each pair having the same roll crown arranged arranged in opposite axial directions and are axially shiftably mounted on a mill housing.
Description
2~1826~.
BACKGROUND OF THE INVENTION
The present invention relates to a multi-roll cluster rolling apparatus of the 12-high or 20-high class having superior flatness control characteristic.
In recent years, multi-roll cluster rolling apparatus of 12-high or 20-high class has usually been used for cold rolling of materials which are difficult to work, e.g., stainless steels and silicon steels. This type of multi-roll cluster rolling apparatus offers an advantage in that,since the work rolls can have a reduced diameter, rolling at a large reduction ratio is possible with a smaller rolling load than in conventional vertical rolling mills.
On the other hand, however, this type of rolling apparatus suffers from a disadvantage in that the cross-sectional shape or flatness of the rolled products tends to be degraded due to greater tendency of work roll deflection attributable to the reduction in the diameter of the work rolls.
Hitherto, various countermeasures have been proposed to obviate this problem.
For instance, a method has been proposed in which the outermost backup rolls are axially divided into a plurality of segments and the amounts of axial displacements of these qE' 2~3r~6~.
roll segments are suitably adjusted to control the profile of the rolled product. The merit of this method, however, could not be fully enjoyed when the rolling apparatus is of multi-roll type having many intermediate rolls, such as 12-05 high or 20-high rolling mills, because the effect of control of the outermost backup rolls is absorbed by such many intermediate rolls.
In order to overcome this problem, a method has been proposed in, for example, Japanese Patent Unexamined Publication No. 58-50108, in which work roll benders and intermediate roll benders are used in combination with the control of displacements of the outermost backup roll segments mentioned above. This method, however, requires a highly complicated control mechanism. In addition, appreciable control effect is obtained only at both breadthwise ends of the rolled material when the roll diameters are reduced and when the roll barrel lengths are increased, because in such cases the bending force effect can hardly reach the breadthwise central portion of the material.
A method has been proposed in, for example, Japanese Patent Unexamined Publication No. 63-207405 in which intermediate rolls are tapered in axial direction at one their ends, and such tapered intermediate rolls are independently shifted in the axial directions. In this ~018^~6~.
method, the control effect can be obtained only in the regions near the tapered portions of these intermediate rolls. In addition, it is difficult to change the intermediate rolls to employ different degrees of tapers in 05 accordance with a change in the rolling conditions, such as the type of the steel to be rolled and the width of the rolled product to be obtained.
A vertically-arranged rolling apparatus disclosed in, for example, Japanese Patent Unexamined Publication No. 63-30104 employs axially shiftable rolls provided with S-crowns the dimension of which can be approximated by cubic equations. This rolling apparatus, however, is not a multi-roll cluster rolling mill. In addition, this rolling apparatus can produce the control effect only on both breadthwise ends and the central portion of the rolled material, and cannot satisfactorily prevent defects such as quarter elongation and composite elongation which is produced by combination of a center buckle and an edge wave.
Accordingly, an object of the present invention is to provide a multi-roll cluster rolling apparatus of the 12-high or 20-high class having superior profile control performance and capable of effecting correction of complicated profile defect such as quarter elongation and edge/center composite elongation, not to mention simple defects such as center buckle and edge wave, as well as correction of any edge drop, thereby overcoming the above-described problems of the known art.
To this end, according to the present invention, there is provided a multi-roll cluster rolling apparatus having a pair of work rolls, and a plurality of intermediate rolls and a plurality of backup rolls arranged successively behind each work roll. A roll crown resembling a two-pitch portion of a wave form (i.e., sine curve) (which may hereinafter be referred to as W-crown) is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls and the intermediate rolls. A roll crown resembling a one-pitch portion of a wave form (i.e., sine curve) (which may hereinunder be referred to as S-crown) may be imparted to at least one other pair of rolls selected from the roll group. A roll crown formed by unidirection-ally tapering one end of a roll (which may hereinunder be referred to as T-crown) may be imparted to at least one remaining pair of rolls selected from the roll group. The rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftably mounted on a mill housing. There should be at least two of the roll crowns mentioned above and the W-crown should always be included. The intermediate rolls may be two-tier rolls consisting of a plurality of first intermediate rolls and a plurality of second intermediate rolls, particularly when the apparatus is a 20-high multi-roll cluster rolling apparatus.
-,, ~
20~2~1 73461-14 The above and other objects, features and advantages of the present invention will become clear from the following 5a 201~61 description of the preferred embodiments when the same is read in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figs. l(a) and l(b) are a side elevational view and a front elevational view of a 20-high rolling apparatus to which the present invention is applied;
Figs. 2(a) to 2(d) are schematic illustrations showing a change in the roll gap as observed when parallel T-crown rolls, which are arranged in opposite directions, are shifted in the direction of the roll axis;
Figs. 3(a) to 3(c) are schematic illustrations showing a change in the roll gap as observed when parallel S-crown rolls, which are arranged in opposite directions, are shifted in the direction of the roll axis;
Figs. 4(a) to 4(c) are schematic illustrations showing a change in the roll gap as observed when parallel W-crown rolls, which are arranged in opposite directions, are shifted in the direction of the roll axis;
Fig. 5 is a graph showing profile control performance of the 20-high rolling apparatus obtained when a pair of T-crown rolls, a pair of S-crown rolls and a pair of W-crown rolls are used as first or second intermediate rolls, respectively;
Fig. 6 is a graph showing a profile-controllable range of the 20-high rolling apparatus as obtained when T-crown rolls are used as the work rolls while W-crown rolls and S-crown rolls are respectively used as the first and second intermediate rolls;
Figs. 7(a), 7(b) and 7(c) are illustrations of tapers of 2018~61 a single-end-tapered rolls;
Fig. 8 is an illustration of an S-crown which can be approximated by one pitch of a sine-wave curve;
Fig. 9 is an illustration of a W-crown which can be approximated by two pitches of a sine-wave curve;
Fig. lO(a), lO(b), ll(a), ll(b), 12(a) and 12(b) are illustrations showing arrangements of T-crown rolls, W-crown rolls and S-crown rolls in a 20-high rolling apparatus, as well as profile-controllable ranges; and Figs. 13(a), 13(b) and 14(a), 14(b) are illustrations showing arrangements of T-crown rolls, W-crown rolls and S-crown rolls in a 12-high rolling apparatus, as well as profile-controllable ranges.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Preferred embodiments of the present invention will be described with reference to the drawings.
Figs. la and lb are a side elevational view and a front elevational view of a multi-roll cluster rolling apparatus in accordance with the present invention. A material under rolling is denoted by 1. The rolling apparatus has work rolls 2, first intermediate rolls 3, second intermediate rolls 4 and divided-type backup rolls 5. More specifically, upper and lower work rolls 2, 2 are arranged to oppose each other across the rolled material 1.
Two ~.~, Z(~ 6~.
first intermediate rolls 3,3 are arranged behind each work roll 2. Thus, there are four first intermediate rolls 3 in total. There are three second intermediate rolls 4,4,4 behind the pair of first intermediate rolls 2,2 at each 05 slde of the rolled material l. Thus, six second intermediate rolls 4 are employed in total. The three second intermediate rolls 4,4,4 on each side of the rolled material l are backed up by four divided-type backup rolls 5. Thus, there are eight backup rolls 5 in total. It will be seen that the pair of work rolls 2, four first intermediate rolls 3, six second intermediate rolls 4 and eight backup rolls 5, in cooperation, form the 20-highrolling apparatus. The work rolls 2, first intermediate rolls 3 and the second intermediate rolls 4 are independently shiftable in the axial directions by conventional hydraulic or electrical shifting devices (not shown).
Numeral 6 designate roll bending devices.
Figs. 2a to 2d show the manner in which the roll gap between parallel single-end-tapered rolls is changed in accordance with axial shifts of these rolls. These rolls are tapered by grinding only at their one axial end regions which are opposite to each other, and will be referred to as "T-crown rolls" hereinafter.
20~8~
As will be seen from these Figures, it is possible to reduce any edge drop by varying the width (x) of the breadthwise end regions of the material rolled by the tapered portions of the roll, by suitably controlling the 05 axial shift of the T-crown rolls.
Figs. 3a to 3c show the manner in which the roll gap between a pair of rolls is changed in accordance with axial shifts of these rolls, the rolls having a roll crown of a waveform approximated by one pitch of sine wave (referred to simply as "S-crown roll") and arranged in opposite directions.
In the state shown in Fig. 3a, both rolls are vertically aligned with each other so as to provide a constant gap therebetween along the length of these rolls.
In the state shown in Fig. 3b, the rolls have been moved in opposite directions from the positions shown in Fig. 3a, so as to provide a roll gap which is large at the center and small at both breadthwise ends. In the state shown in Fig. 3c, the rolls have been moved in the directions counter to those in Fig. 3b, so as to provide a roll gap which is small at the center and large at both breadthwise ends.
Figs. 4a to 4c show the manner in which the roll gap between a pair of rolls is changed in accordance with axial shifts of these rolls, when the rolls have a roll crown of 2(~ ~r ~6~L
a waveform approximated by two pitches of sine wave (referred to simply as "W-crown roll") and are arranged in opposite directions.
In the state shown in Fig. 4a, both rolls are 05 vertically aligned with each other so as to provide a constant gap therebetween along the length of these rolls.
In the state shown in Fig. 4b, the rolls have been moved in opposite directions from the positions shown in Fig. 4a, so as to provide a roll gap which is large at the center and both breadthwise ends and small at the quarter portions.
In the state shown in Fig. 4c, the rolls have been moved in the directions counter to those in Fig. 4b, so as to provide a roll gap which is small at the center and both breadthwise ends and large at the quarter portions.
A 20-high rolling apparatus of the type shown in Fig. 1 was built up by using pair of T-crown rolls as the first intermediate rolls, and a pairs of S- or W-crown rolls as the second intermediate rolls. A test was conducted to examine the profile control performance of this rolling apparatus by independently shifting these intermediate rolls. The results of this test are shown in Fig. S in comparison with the case where the backup roll sections corresponding to the quarter portions are forced out.
The profile control performance can be expressed in terms of an elongation difference ratio A2 representing the degree of difference between the elongation at the central portion and the elongation at breadthwise ends of the rolled material, and an elongation difference ratio A4 representing the degree of difference between the elongation at the central portion and the elongation at quarter portions of the rolled material, the ratios A2 and A4 being respectively expressed by the following formulae:
A = (Q - Q )/Q
A = (Q - Q )/Q
where Q0 represents the length (mm) of the material after rolling as measured at a breathwise mid portion of the material; Q2 represents the length (mm) of the material afterrolling as measured at a breadthwise end portion of the material; and Q4 represents the length (mm) of the material after rolling as measured at a breadthwise quarter portion of the material.
In Fig. 5, lengths of straight lines represent the level of the profile control performance, while the gradients of the lines represent the ratios of controls of elongations.
For instance, large gradients of the lines representing the characteristics obtained when the T- or S-crown rolls are shifted alone show that such roll shifts are effective in the control of edge wave and center buckle but no 2~826~
substantial effect is expectable in regard to the control of the quarter elongation and the edge/center composite elongation.
The control by force-out of the backup roll segments is 05 represented by a line which has a very small gradient.
Thus, this method can provide only a small effect in the control of the quarter elongation and the edge/center composite elongation and cannot provide any substantial effect in the control of edge wave and center buckle.
Shifting of the W-crown rolls alone can provide an appreciable effect in the control of the quarter elongation and the edge/center, but is quite ineffective in the control of the edge wave and the center buckle.
Another 20-high rolling apparatus of the type shown in Fig.l was built up by using T-, S- and W-crown rolls as the work rolls, first intermediate rolls and the second intermediate rolls, respectively, and the profile correction performance of this rolling apparatus was examined. The result is shown in Fig. 6 together with the results of the same investigation conducted on a conventional apparatus which incorporated T-crown rolls as the first intermediate rolls in combination with roll benders and also with divided backup roll force-out method.
As will be understood from Fig. 6, the rolling apparatus of the present invention which employs T-, S- and z~
W-crown rolls in combination and which relies upon suitable axial shifts of these rolls, exhibited superior effect in correcting quarter elongation, composite elongation and edge drop, not to mention simple edge wave and center 05 buckle. It is thus understood that the apparatus of the present invention can conduct a flatness control over wide ranges. This should be contrasted to the conventional apparatus which could provide certain effects on the control of the edge wave and the center buckle but no substantial effect in the correction of edge/center composite elongation and quarter elongation.
Thus, in the rolling apparatus of the present invention, the merits of different types of roll crown are combined while demerits are canceled, thus overcoming the difficulty in the flatness control caused in current rolling apparatus having rolls of large length-to-diameter (L/D) ratio values and incorporating a large number of intermediate and backup rolls.
According to the invention, the roll pairs which are to be T-. S- and W-crowned may be any pair or pairs of rolls selected from the roll groups consisting of the work rolls, first intermediate rolls and the second intermediate rolls.
It is, however, preferred that the pair of rolls to which the crown of the same type is applied belong to the same roll group, i.e., to the group consisting of the work 2~ 6~
rolls, group consisting of the first intermediate rolls or the group consisting of the third intermediate groups.
The types and degrees of the rolling defects vary depending on the type of the steel material to be rolled and also on 05 the rolling conditions. The types of roll crown and the rolls to which these crowns are imparted are determined in consideration of the types and degrees of such rolling defects. It is, however, generally recognized that a greater control effect is obtained when the T-, S- or W-crown rolls are disposed closer to the rolled material. In addition, greater, medium and a smaller effects are obtained when the pair of the rolls of the same crown type are arranged in symmetry with respect to a point, a horizontal plane and a vertical plane.
lS The invention does not exclude a simultaneous use of roll benders. A greater effect on elongations at the edges such as edge wave will be obtained when roll benders are used in combination with the roll arrangement of the present invention.
The waveforms or curves of the crown to be imparted may be one- or two-pitch section of a sine-wave curve or a curve of a function of three or higher orders, as well as curves approximating these curves, among which one- or two-pitch portion of a sine-wave curve or a curve approximating such a curve is used most suitably.
2ol82~
Examples Example 1 A 20-high rolling apparatus of the type shown in Fig. 1 was built-up using single-end-tapered T-crown rolls of Fig.
05 7a as the work rolls, S-crown rolls of the type shown in Fig. 8 approximated by one-pitch of a sine-wave curve as all the first intermediate rolls 3, and W-crown rolls of Fig. 9 approximated by two-pitch portion of a sine wave curve as selected second intermediate rolls which are hatched in Fig. 1.
A test rolling was conducted to roll a stainless steel sheet of 1000 mm wide from 1.2 mm down to 1.0 mm, while axially shifting the work rolls, first intermediate rolls and the second intermediate rolls in various manners.
Fig. 1Oa shows the above-mentioned roll arrangement, while Fig. lOb shows the range of profile control wh~ch can be covered by this rolling apparatus. Fig. lOb also shows the results of the same test rolling reduction conducted to examine the profile control performance of a known rolling apparatus which incorporated axially-shiftable single-end tapered rolls of the type shown in Figs. 7b and 7c as the first and second intermediate rolls, together with a control by force-out of segments of divided backup rolls.
As will be seen from Fig. lOb, the known apparatus could effect the profile control only in a small range. In ~ .
t~
201826:1 particular, ability to correct composite elongation and quarter elongation is very small. Due to the small range of the profile control, this known apparatus require a change in the taper of the first or second intermediate 05 rolls depending on conditions such as the kind and breadth of the material to be rolled.
In contrast, the rolling apparatus embodying the invention exhibited an ability to correct all types of elongations including composite and quarter elongations over wide ranges, and could effect a good profile control for a variety of types of the rolled material without requiring change of the intermediate rolls .
Example 2 A 20-high rolling apparatus of the type shown in Fig. 1 was built-up by using, as shown in Fig. lla, T-crown rolls of Fig. 7b as the first intermediate rolls, W-crown rolls of Fig. 9 approximated by two-pitch portion of a sine-wave curve as the outer four intermediate rolls, i.e., left and right pairs of the second intermediate rolls, and S-crown rolls of Fig. 8 approximated by one-pitch portion of a sine-wave curve as the central pair of the second intermediate rolls. Using this rolling apparatus, a test rolling was conducted under the same conditions as Example 1 to examine the profile control ability of this apparatus, the results being shown in Fig. 11b.
,.~
. .
2Q182~i1 Example 3 A 20-hlgh rolling apparatus of the type shown in Fig. 1 was bullt-up by uslng, as shown ln Fig. 12a T-crown rolls of Flg.
7b as the flrst lntermedlate rolls, and W-crown rolls of Flg. 9 approxlmated by two-pltch portlon of a slne-wave curve as the outer four lntermedlate rolls, l.e., left and rlght palrs of the second lntermedlate rolls. Uslng thls rolllng apparatus, a test rolllng was conducted under the same condltlons as Example 1 to examlne the proflle control ablllty of thls apparatus, the results belng shown ln Flg. 12b.
Example 4 A 12-high rolllng apparatus was bullt-up by uslng, as shown ln Flg. 13a, S-crown rolls of Flg. 8 approxlmated by one-pitch portlon of a sine-wave curve as the work rolls, W-crown rolls of Fig. ~ approxlmated by two-pltch portlon of a slne-wave curve as the rolls of one of the left and rlght palrs of the lntermedlate rolls, each palr includlng an upper roll and a lower roll, and T-crown rolls of Flg. 7b as the rolls of the other of the left and rlght palrs of the lntermedlate rolls. Uslng thls rolllng apparatus wlth slmultaneous use of the dlvlded backup roll force-out control and roll benders, a test rolllng was conducted under the same condltlons as Example 1 to examlne the proflle X
2C~ 8~1 control ability of this apparatus. The result ls shown in Fig.
13b. Fig. 13b also shows the results of the same test rolling reduction conducted to examine the profile control performance of a known rolling apparatus which incorporated axially-shlftable single-end tapered rolls of the type shown in Fig. 7b as the intermediate rolls, together wlth a control by force-out of segments of divided backup rolls.
Example 5 A 12-high rolllng apparatus was built up by uslng, as shown ln Flg. 14a T-crown rolls of Flg. 7a as the work rolls, and W-crown rolls of Flg. 9 approxlmated by two pltches of a slne-wave curve as the intermediate rolls of one of two pairs of intermedi-ate rolls, each pair lncludlng two rolls whlch are ln symmetry wlth each other with respect to a point on the pinched portlon of the rolled materlal. At the same tlme, a control by force-out of segments of divided backup rolls was used simultaneously. Using this rolling apparatus, a test rolllng was conducted under the same conditions as Example 4 to examine the profile control abili-ty of this apparatus, the results being shown in Fig. 14b.
As will be understood from the foregoing description, the multi-roll cluster rolling apparatus of the present invention offers excellent performance for effecting correction of rolling defects such as quarter elongation X
20~ ~ir~6~L
and composite elongation, as well as edge drop, not to mention the simple deformation such as edge wave and center buckle, thus realizing a superior flatness control effect over a wide range.
BACKGROUND OF THE INVENTION
The present invention relates to a multi-roll cluster rolling apparatus of the 12-high or 20-high class having superior flatness control characteristic.
In recent years, multi-roll cluster rolling apparatus of 12-high or 20-high class has usually been used for cold rolling of materials which are difficult to work, e.g., stainless steels and silicon steels. This type of multi-roll cluster rolling apparatus offers an advantage in that,since the work rolls can have a reduced diameter, rolling at a large reduction ratio is possible with a smaller rolling load than in conventional vertical rolling mills.
On the other hand, however, this type of rolling apparatus suffers from a disadvantage in that the cross-sectional shape or flatness of the rolled products tends to be degraded due to greater tendency of work roll deflection attributable to the reduction in the diameter of the work rolls.
Hitherto, various countermeasures have been proposed to obviate this problem.
For instance, a method has been proposed in which the outermost backup rolls are axially divided into a plurality of segments and the amounts of axial displacements of these qE' 2~3r~6~.
roll segments are suitably adjusted to control the profile of the rolled product. The merit of this method, however, could not be fully enjoyed when the rolling apparatus is of multi-roll type having many intermediate rolls, such as 12-05 high or 20-high rolling mills, because the effect of control of the outermost backup rolls is absorbed by such many intermediate rolls.
In order to overcome this problem, a method has been proposed in, for example, Japanese Patent Unexamined Publication No. 58-50108, in which work roll benders and intermediate roll benders are used in combination with the control of displacements of the outermost backup roll segments mentioned above. This method, however, requires a highly complicated control mechanism. In addition, appreciable control effect is obtained only at both breadthwise ends of the rolled material when the roll diameters are reduced and when the roll barrel lengths are increased, because in such cases the bending force effect can hardly reach the breadthwise central portion of the material.
A method has been proposed in, for example, Japanese Patent Unexamined Publication No. 63-207405 in which intermediate rolls are tapered in axial direction at one their ends, and such tapered intermediate rolls are independently shifted in the axial directions. In this ~018^~6~.
method, the control effect can be obtained only in the regions near the tapered portions of these intermediate rolls. In addition, it is difficult to change the intermediate rolls to employ different degrees of tapers in 05 accordance with a change in the rolling conditions, such as the type of the steel to be rolled and the width of the rolled product to be obtained.
A vertically-arranged rolling apparatus disclosed in, for example, Japanese Patent Unexamined Publication No. 63-30104 employs axially shiftable rolls provided with S-crowns the dimension of which can be approximated by cubic equations. This rolling apparatus, however, is not a multi-roll cluster rolling mill. In addition, this rolling apparatus can produce the control effect only on both breadthwise ends and the central portion of the rolled material, and cannot satisfactorily prevent defects such as quarter elongation and composite elongation which is produced by combination of a center buckle and an edge wave.
Accordingly, an object of the present invention is to provide a multi-roll cluster rolling apparatus of the 12-high or 20-high class having superior profile control performance and capable of effecting correction of complicated profile defect such as quarter elongation and edge/center composite elongation, not to mention simple defects such as center buckle and edge wave, as well as correction of any edge drop, thereby overcoming the above-described problems of the known art.
To this end, according to the present invention, there is provided a multi-roll cluster rolling apparatus having a pair of work rolls, and a plurality of intermediate rolls and a plurality of backup rolls arranged successively behind each work roll. A roll crown resembling a two-pitch portion of a wave form (i.e., sine curve) (which may hereinafter be referred to as W-crown) is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls and the intermediate rolls. A roll crown resembling a one-pitch portion of a wave form (i.e., sine curve) (which may hereinunder be referred to as S-crown) may be imparted to at least one other pair of rolls selected from the roll group. A roll crown formed by unidirection-ally tapering one end of a roll (which may hereinunder be referred to as T-crown) may be imparted to at least one remaining pair of rolls selected from the roll group. The rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftably mounted on a mill housing. There should be at least two of the roll crowns mentioned above and the W-crown should always be included. The intermediate rolls may be two-tier rolls consisting of a plurality of first intermediate rolls and a plurality of second intermediate rolls, particularly when the apparatus is a 20-high multi-roll cluster rolling apparatus.
-,, ~
20~2~1 73461-14 The above and other objects, features and advantages of the present invention will become clear from the following 5a 201~61 description of the preferred embodiments when the same is read in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figs. l(a) and l(b) are a side elevational view and a front elevational view of a 20-high rolling apparatus to which the present invention is applied;
Figs. 2(a) to 2(d) are schematic illustrations showing a change in the roll gap as observed when parallel T-crown rolls, which are arranged in opposite directions, are shifted in the direction of the roll axis;
Figs. 3(a) to 3(c) are schematic illustrations showing a change in the roll gap as observed when parallel S-crown rolls, which are arranged in opposite directions, are shifted in the direction of the roll axis;
Figs. 4(a) to 4(c) are schematic illustrations showing a change in the roll gap as observed when parallel W-crown rolls, which are arranged in opposite directions, are shifted in the direction of the roll axis;
Fig. 5 is a graph showing profile control performance of the 20-high rolling apparatus obtained when a pair of T-crown rolls, a pair of S-crown rolls and a pair of W-crown rolls are used as first or second intermediate rolls, respectively;
Fig. 6 is a graph showing a profile-controllable range of the 20-high rolling apparatus as obtained when T-crown rolls are used as the work rolls while W-crown rolls and S-crown rolls are respectively used as the first and second intermediate rolls;
Figs. 7(a), 7(b) and 7(c) are illustrations of tapers of 2018~61 a single-end-tapered rolls;
Fig. 8 is an illustration of an S-crown which can be approximated by one pitch of a sine-wave curve;
Fig. 9 is an illustration of a W-crown which can be approximated by two pitches of a sine-wave curve;
Fig. lO(a), lO(b), ll(a), ll(b), 12(a) and 12(b) are illustrations showing arrangements of T-crown rolls, W-crown rolls and S-crown rolls in a 20-high rolling apparatus, as well as profile-controllable ranges; and Figs. 13(a), 13(b) and 14(a), 14(b) are illustrations showing arrangements of T-crown rolls, W-crown rolls and S-crown rolls in a 12-high rolling apparatus, as well as profile-controllable ranges.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Preferred embodiments of the present invention will be described with reference to the drawings.
Figs. la and lb are a side elevational view and a front elevational view of a multi-roll cluster rolling apparatus in accordance with the present invention. A material under rolling is denoted by 1. The rolling apparatus has work rolls 2, first intermediate rolls 3, second intermediate rolls 4 and divided-type backup rolls 5. More specifically, upper and lower work rolls 2, 2 are arranged to oppose each other across the rolled material 1.
Two ~.~, Z(~ 6~.
first intermediate rolls 3,3 are arranged behind each work roll 2. Thus, there are four first intermediate rolls 3 in total. There are three second intermediate rolls 4,4,4 behind the pair of first intermediate rolls 2,2 at each 05 slde of the rolled material l. Thus, six second intermediate rolls 4 are employed in total. The three second intermediate rolls 4,4,4 on each side of the rolled material l are backed up by four divided-type backup rolls 5. Thus, there are eight backup rolls 5 in total. It will be seen that the pair of work rolls 2, four first intermediate rolls 3, six second intermediate rolls 4 and eight backup rolls 5, in cooperation, form the 20-highrolling apparatus. The work rolls 2, first intermediate rolls 3 and the second intermediate rolls 4 are independently shiftable in the axial directions by conventional hydraulic or electrical shifting devices (not shown).
Numeral 6 designate roll bending devices.
Figs. 2a to 2d show the manner in which the roll gap between parallel single-end-tapered rolls is changed in accordance with axial shifts of these rolls. These rolls are tapered by grinding only at their one axial end regions which are opposite to each other, and will be referred to as "T-crown rolls" hereinafter.
20~8~
As will be seen from these Figures, it is possible to reduce any edge drop by varying the width (x) of the breadthwise end regions of the material rolled by the tapered portions of the roll, by suitably controlling the 05 axial shift of the T-crown rolls.
Figs. 3a to 3c show the manner in which the roll gap between a pair of rolls is changed in accordance with axial shifts of these rolls, the rolls having a roll crown of a waveform approximated by one pitch of sine wave (referred to simply as "S-crown roll") and arranged in opposite directions.
In the state shown in Fig. 3a, both rolls are vertically aligned with each other so as to provide a constant gap therebetween along the length of these rolls.
In the state shown in Fig. 3b, the rolls have been moved in opposite directions from the positions shown in Fig. 3a, so as to provide a roll gap which is large at the center and small at both breadthwise ends. In the state shown in Fig. 3c, the rolls have been moved in the directions counter to those in Fig. 3b, so as to provide a roll gap which is small at the center and large at both breadthwise ends.
Figs. 4a to 4c show the manner in which the roll gap between a pair of rolls is changed in accordance with axial shifts of these rolls, when the rolls have a roll crown of 2(~ ~r ~6~L
a waveform approximated by two pitches of sine wave (referred to simply as "W-crown roll") and are arranged in opposite directions.
In the state shown in Fig. 4a, both rolls are 05 vertically aligned with each other so as to provide a constant gap therebetween along the length of these rolls.
In the state shown in Fig. 4b, the rolls have been moved in opposite directions from the positions shown in Fig. 4a, so as to provide a roll gap which is large at the center and both breadthwise ends and small at the quarter portions.
In the state shown in Fig. 4c, the rolls have been moved in the directions counter to those in Fig. 4b, so as to provide a roll gap which is small at the center and both breadthwise ends and large at the quarter portions.
A 20-high rolling apparatus of the type shown in Fig. 1 was built up by using pair of T-crown rolls as the first intermediate rolls, and a pairs of S- or W-crown rolls as the second intermediate rolls. A test was conducted to examine the profile control performance of this rolling apparatus by independently shifting these intermediate rolls. The results of this test are shown in Fig. S in comparison with the case where the backup roll sections corresponding to the quarter portions are forced out.
The profile control performance can be expressed in terms of an elongation difference ratio A2 representing the degree of difference between the elongation at the central portion and the elongation at breadthwise ends of the rolled material, and an elongation difference ratio A4 representing the degree of difference between the elongation at the central portion and the elongation at quarter portions of the rolled material, the ratios A2 and A4 being respectively expressed by the following formulae:
A = (Q - Q )/Q
A = (Q - Q )/Q
where Q0 represents the length (mm) of the material after rolling as measured at a breathwise mid portion of the material; Q2 represents the length (mm) of the material afterrolling as measured at a breadthwise end portion of the material; and Q4 represents the length (mm) of the material after rolling as measured at a breadthwise quarter portion of the material.
In Fig. 5, lengths of straight lines represent the level of the profile control performance, while the gradients of the lines represent the ratios of controls of elongations.
For instance, large gradients of the lines representing the characteristics obtained when the T- or S-crown rolls are shifted alone show that such roll shifts are effective in the control of edge wave and center buckle but no 2~826~
substantial effect is expectable in regard to the control of the quarter elongation and the edge/center composite elongation.
The control by force-out of the backup roll segments is 05 represented by a line which has a very small gradient.
Thus, this method can provide only a small effect in the control of the quarter elongation and the edge/center composite elongation and cannot provide any substantial effect in the control of edge wave and center buckle.
Shifting of the W-crown rolls alone can provide an appreciable effect in the control of the quarter elongation and the edge/center, but is quite ineffective in the control of the edge wave and the center buckle.
Another 20-high rolling apparatus of the type shown in Fig.l was built up by using T-, S- and W-crown rolls as the work rolls, first intermediate rolls and the second intermediate rolls, respectively, and the profile correction performance of this rolling apparatus was examined. The result is shown in Fig. 6 together with the results of the same investigation conducted on a conventional apparatus which incorporated T-crown rolls as the first intermediate rolls in combination with roll benders and also with divided backup roll force-out method.
As will be understood from Fig. 6, the rolling apparatus of the present invention which employs T-, S- and z~
W-crown rolls in combination and which relies upon suitable axial shifts of these rolls, exhibited superior effect in correcting quarter elongation, composite elongation and edge drop, not to mention simple edge wave and center 05 buckle. It is thus understood that the apparatus of the present invention can conduct a flatness control over wide ranges. This should be contrasted to the conventional apparatus which could provide certain effects on the control of the edge wave and the center buckle but no substantial effect in the correction of edge/center composite elongation and quarter elongation.
Thus, in the rolling apparatus of the present invention, the merits of different types of roll crown are combined while demerits are canceled, thus overcoming the difficulty in the flatness control caused in current rolling apparatus having rolls of large length-to-diameter (L/D) ratio values and incorporating a large number of intermediate and backup rolls.
According to the invention, the roll pairs which are to be T-. S- and W-crowned may be any pair or pairs of rolls selected from the roll groups consisting of the work rolls, first intermediate rolls and the second intermediate rolls.
It is, however, preferred that the pair of rolls to which the crown of the same type is applied belong to the same roll group, i.e., to the group consisting of the work 2~ 6~
rolls, group consisting of the first intermediate rolls or the group consisting of the third intermediate groups.
The types and degrees of the rolling defects vary depending on the type of the steel material to be rolled and also on 05 the rolling conditions. The types of roll crown and the rolls to which these crowns are imparted are determined in consideration of the types and degrees of such rolling defects. It is, however, generally recognized that a greater control effect is obtained when the T-, S- or W-crown rolls are disposed closer to the rolled material. In addition, greater, medium and a smaller effects are obtained when the pair of the rolls of the same crown type are arranged in symmetry with respect to a point, a horizontal plane and a vertical plane.
lS The invention does not exclude a simultaneous use of roll benders. A greater effect on elongations at the edges such as edge wave will be obtained when roll benders are used in combination with the roll arrangement of the present invention.
The waveforms or curves of the crown to be imparted may be one- or two-pitch section of a sine-wave curve or a curve of a function of three or higher orders, as well as curves approximating these curves, among which one- or two-pitch portion of a sine-wave curve or a curve approximating such a curve is used most suitably.
2ol82~
Examples Example 1 A 20-high rolling apparatus of the type shown in Fig. 1 was built-up using single-end-tapered T-crown rolls of Fig.
05 7a as the work rolls, S-crown rolls of the type shown in Fig. 8 approximated by one-pitch of a sine-wave curve as all the first intermediate rolls 3, and W-crown rolls of Fig. 9 approximated by two-pitch portion of a sine wave curve as selected second intermediate rolls which are hatched in Fig. 1.
A test rolling was conducted to roll a stainless steel sheet of 1000 mm wide from 1.2 mm down to 1.0 mm, while axially shifting the work rolls, first intermediate rolls and the second intermediate rolls in various manners.
Fig. 1Oa shows the above-mentioned roll arrangement, while Fig. lOb shows the range of profile control wh~ch can be covered by this rolling apparatus. Fig. lOb also shows the results of the same test rolling reduction conducted to examine the profile control performance of a known rolling apparatus which incorporated axially-shiftable single-end tapered rolls of the type shown in Figs. 7b and 7c as the first and second intermediate rolls, together with a control by force-out of segments of divided backup rolls.
As will be seen from Fig. lOb, the known apparatus could effect the profile control only in a small range. In ~ .
t~
201826:1 particular, ability to correct composite elongation and quarter elongation is very small. Due to the small range of the profile control, this known apparatus require a change in the taper of the first or second intermediate 05 rolls depending on conditions such as the kind and breadth of the material to be rolled.
In contrast, the rolling apparatus embodying the invention exhibited an ability to correct all types of elongations including composite and quarter elongations over wide ranges, and could effect a good profile control for a variety of types of the rolled material without requiring change of the intermediate rolls .
Example 2 A 20-high rolling apparatus of the type shown in Fig. 1 was built-up by using, as shown in Fig. lla, T-crown rolls of Fig. 7b as the first intermediate rolls, W-crown rolls of Fig. 9 approximated by two-pitch portion of a sine-wave curve as the outer four intermediate rolls, i.e., left and right pairs of the second intermediate rolls, and S-crown rolls of Fig. 8 approximated by one-pitch portion of a sine-wave curve as the central pair of the second intermediate rolls. Using this rolling apparatus, a test rolling was conducted under the same conditions as Example 1 to examine the profile control ability of this apparatus, the results being shown in Fig. 11b.
,.~
. .
2Q182~i1 Example 3 A 20-hlgh rolling apparatus of the type shown in Fig. 1 was bullt-up by uslng, as shown ln Fig. 12a T-crown rolls of Flg.
7b as the flrst lntermedlate rolls, and W-crown rolls of Flg. 9 approxlmated by two-pltch portlon of a slne-wave curve as the outer four lntermedlate rolls, l.e., left and rlght palrs of the second lntermedlate rolls. Uslng thls rolllng apparatus, a test rolllng was conducted under the same condltlons as Example 1 to examlne the proflle control ablllty of thls apparatus, the results belng shown ln Flg. 12b.
Example 4 A 12-high rolllng apparatus was bullt-up by uslng, as shown ln Flg. 13a, S-crown rolls of Flg. 8 approxlmated by one-pitch portlon of a sine-wave curve as the work rolls, W-crown rolls of Fig. ~ approxlmated by two-pltch portlon of a slne-wave curve as the rolls of one of the left and rlght palrs of the lntermedlate rolls, each palr includlng an upper roll and a lower roll, and T-crown rolls of Flg. 7b as the rolls of the other of the left and rlght palrs of the lntermedlate rolls. Uslng thls rolllng apparatus wlth slmultaneous use of the dlvlded backup roll force-out control and roll benders, a test rolllng was conducted under the same condltlons as Example 1 to examlne the proflle X
2C~ 8~1 control ability of this apparatus. The result ls shown in Fig.
13b. Fig. 13b also shows the results of the same test rolling reduction conducted to examine the profile control performance of a known rolling apparatus which incorporated axially-shlftable single-end tapered rolls of the type shown in Fig. 7b as the intermediate rolls, together wlth a control by force-out of segments of divided backup rolls.
Example 5 A 12-high rolllng apparatus was built up by uslng, as shown ln Flg. 14a T-crown rolls of Flg. 7a as the work rolls, and W-crown rolls of Flg. 9 approxlmated by two pltches of a slne-wave curve as the intermediate rolls of one of two pairs of intermedi-ate rolls, each pair lncludlng two rolls whlch are ln symmetry wlth each other with respect to a point on the pinched portlon of the rolled materlal. At the same tlme, a control by force-out of segments of divided backup rolls was used simultaneously. Using this rolling apparatus, a test rolllng was conducted under the same conditions as Example 4 to examine the profile control abili-ty of this apparatus, the results being shown in Fig. 14b.
As will be understood from the foregoing description, the multi-roll cluster rolling apparatus of the present invention offers excellent performance for effecting correction of rolling defects such as quarter elongation X
20~ ~ir~6~L
and composite elongation, as well as edge drop, not to mention the simple deformation such as edge wave and center buckle, thus realizing a superior flatness control effect over a wide range.
Claims (24)
1. A 20-high multi-roll cluster rolling apparatus having:
a pair of work rolls, and a plurality of first intermediate rolls, a plurality of second intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown formed by unidirectionally tapering one end of a roll is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls, the first intermediate rolls and the second intermediate rolls, a roll crown of a shape of a one-pitch portion of a sine curve is imparted to at least one other pair of rolls selected from the said roll group, a roll crown of a shape of a two-pitch portion of a sine curve is imparted to at least one still other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftably mounted on a mill housing.
a pair of work rolls, and a plurality of first intermediate rolls, a plurality of second intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown formed by unidirectionally tapering one end of a roll is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls, the first intermediate rolls and the second intermediate rolls, a roll crown of a shape of a one-pitch portion of a sine curve is imparted to at least one other pair of rolls selected from the said roll group, a roll crown of a shape of a two-pitch portion of a sine curve is imparted to at least one still other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftably mounted on a mill housing.
2. A 20-high multi-roll cluster rolling apparatus having:
a pair of work rolls, and a plurality of first intermediate rolls, a plurality of second intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown formed by unidirectionally tapering one end of a roll is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls, the first intermediate rolls and the second intermediate rolls, a roll crown of a shape of a two-pitch portion of a sine curve is imparted to at least one other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftable mounted on a mill housing.
a pair of work rolls, and a plurality of first intermediate rolls, a plurality of second intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown formed by unidirectionally tapering one end of a roll is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls, the first intermediate rolls and the second intermediate rolls, a roll crown of a shape of a two-pitch portion of a sine curve is imparted to at least one other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftable mounted on a mill housing.
3. A 20-high multi-roll cluster rolling apparatus having:
a pair of work rolls, and a plurality of first intermediate rolls, a plurality of second intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown of a shape of a one-pitch portion of a sine curve is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls, the first intermediate rolls and the second intermediate rolls, a roll crown of a shape of a two-pitch portion of a sine curve is imparted to at least one other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftable mounted on a mill housing.
a pair of work rolls, and a plurality of first intermediate rolls, a plurality of second intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown of a shape of a one-pitch portion of a sine curve is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls, the first intermediate rolls and the second intermediate rolls, a roll crown of a shape of a two-pitch portion of a sine curve is imparted to at least one other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftable mounted on a mill housing.
4. A 12-high multi-roll cluster rolling apparatus having:
a pair of work rolls, and a plurality of intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown formed by unidirectionally tapering one end of a roll is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls and the inter-mediate rolls, a roll crown of a shape of a one-pitch portion of a sine curve is imparted to at least one other pair of rolls selected from the said roll group, a roll crown of a shape of a two-pitch portion of a sine curve is imparted to at least one still other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftably mounted on a mill housing.
a pair of work rolls, and a plurality of intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown formed by unidirectionally tapering one end of a roll is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls and the inter-mediate rolls, a roll crown of a shape of a one-pitch portion of a sine curve is imparted to at least one other pair of rolls selected from the said roll group, a roll crown of a shape of a two-pitch portion of a sine curve is imparted to at least one still other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftably mounted on a mill housing.
5. A 12-high multi-roll cluster rolling apparatus having:
a pair of work rolls, and a plurality of intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown formed by unidirectionally tapering one end of a roll is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls and the inter-mediate rolls, a roll crown of a shape of a two-pitch portion of a since curve is imparted to at least one other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftably mounted on a mill housing.
a pair of work rolls, and a plurality of intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown formed by unidirectionally tapering one end of a roll is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls and the inter-mediate rolls, a roll crown of a shape of a two-pitch portion of a since curve is imparted to at least one other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftably mounted on a mill housing.
6. A 12-high multi-roll cluster rolling apparatus having:
a pair of work rolls, and a plurality of intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown of a shape of a one-pitch portion of a sine curve is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls and the inter-mediate rolls, a roll crown of a shape of a two-pitch portion of a sine curve is imparted to at least one other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftably mounted on a mill housing.
a pair of work rolls, and a plurality of intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
a roll crown of a shape of a one-pitch portion of a sine curve is imparted to at least one pair of rolls selected from the roll group consisting of the work rolls and the inter-mediate rolls, a roll crown of a shape of a two-pitch portion of a sine curve is imparted to at least one other pair of rolls selected from the said roll group, and the rolls of each pair having the same roll crown are arranged in opposite axial directions and are axially shiftably mounted on a mill housing.
7. A 20-high multi-roll cluster rolling apparatus accord-ing to claim 1, further comprising at least one roll bending device.
8. A 20-high multi-roll cluster rolling apparatus accord-ing to claim 2, further comprising at least one roll bending device.
9. A 20-high multi-roll cluster rolling apparatus accord-ing to claim 3, further comprising at least one roll bending device.
10. A 12-high multi-roll cluster rolling apparatus accord-ing to claim 4, further comprising at least one roll bending device.
11. A 12-high multi-roll cluster rolling apparatus accord-ing to claim 5, further comprising at least one roll bending device.
12. A 12-high multi-roll cluster rolling apparatus accord-ing to claim 6, further comprising at least one roll bending device.
13. A 20-high multi-roll cluster rolling apparatus accord-ing to claim 1 or 7, wherein:
the work rolls are imparted with the roll crown formed by unidirectionally tapering one end of a roll, at least one pair of the first intermediate rolls are imparted with the roll crown of a shape of a one-pitch portion of a sine curve, and at least one pair of the second intermediate rolls are imparted with the roll crown of a shape of a two-pitch portion of a sine curve.
the work rolls are imparted with the roll crown formed by unidirectionally tapering one end of a roll, at least one pair of the first intermediate rolls are imparted with the roll crown of a shape of a one-pitch portion of a sine curve, and at least one pair of the second intermediate rolls are imparted with the roll crown of a shape of a two-pitch portion of a sine curve.
14. A 20-high multi-roll cluster rolling apparatus accord-ing to claim 13, wherein two pairs of the first intermediate rolls are imparted with the roll crown of a shape of a one-pitch portion of a sine curve and two pairs of the second intermediate rolls are imparted by the roll crown of a shape of a two-pitch portion of a sine curve.
15. A 20-high multi-roll cluster rolling apparatus accord-ing to claim 1 or 7, wherein:
at least one pair of the first intermediate rolls are imparted with the roll crown formed by unidirectionally tapering one end of a roll, at least one pair of the second intermediate rolls are imparted with the roll crown of a shape of a one-pitch portion of a sine curve, and at least one other pair of the second intermediate rolls are imparted with the roll crown of a shape of a two-pitch portion of a sine curve.
at least one pair of the first intermediate rolls are imparted with the roll crown formed by unidirectionally tapering one end of a roll, at least one pair of the second intermediate rolls are imparted with the roll crown of a shape of a one-pitch portion of a sine curve, and at least one other pair of the second intermediate rolls are imparted with the roll crown of a shape of a two-pitch portion of a sine curve.
16. A 20-high multi-roll cluster rolling apparatus accord-ing to claim 2 or 8, wherein:
at least one pair of the first intermediate rolls are imparted with the roll crown formed by unidirectionally tapering one end of a roll, and at least one pair of the second intermediate rolls are imparted with the roll crown of a shape of a two-pitch portion of a sine curve.
at least one pair of the first intermediate rolls are imparted with the roll crown formed by unidirectionally tapering one end of a roll, and at least one pair of the second intermediate rolls are imparted with the roll crown of a shape of a two-pitch portion of a sine curve.
17. A 12-high multi-roll cluster rolling apparatus accord-ing to claim 4 or 10, wherein:
the work rolls are imparted with the roll crown of a shape of one-pitch portion of a sine curve, a pair of the intermediate rolls are imparted with the roll crown formed by unidirectionally tapering one end of a roll, and another pair of the intermediate rolls are imparted with the roll crown of a shape of a two-pitch portion of a sine curve.
the work rolls are imparted with the roll crown of a shape of one-pitch portion of a sine curve, a pair of the intermediate rolls are imparted with the roll crown formed by unidirectionally tapering one end of a roll, and another pair of the intermediate rolls are imparted with the roll crown of a shape of a two-pitch portion of a sine curve.
18. A 12-high multi-roll cluster rolling apparatus accord-ing to claim 5 or 11, wherein:
the work rolls are imparted with the roll crown formed by unidirectionally tapering one end of a roll, and a pair of the intermediate rolls are imparted with the roll crown of a shape of a two-pitch portion of a sine curve.
the work rolls are imparted with the roll crown formed by unidirectionally tapering one end of a roll, and a pair of the intermediate rolls are imparted with the roll crown of a shape of a two-pitch portion of a sine curve.
19. A 20-high multi-roll cluster rolling apparatus having:
a pair of work rolls, and a plurality of first intermediate rolls, a plurality of second intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
the first intermediate rolls include at least one pair of rolls which have either a crown in which the diameter of each roll decreases toward one end thereof or a crown of a shape of a two-pitch portion of a sine curve, the second intermediate rolls include at least one pair of rolls which have either a crown of a shape of a two-pitch portion of a sine curve or a crown in which the diameter of each roll decreases toward one end thereof, with the proviso that at least one pair of the first and second intermediate rolls have the crown of a shape of a two-pitch portion of a sine curve, the rolls of each pair having the same roll crown are arranged in axially opposite directions to each other, and each roll of the pair of the first intermediate rolls and the pair of the second intermediate rolls is independently shiftable in the axial direction so as to realize a control of the profile of a rolled material in terms of an end elongation difference ratio ?2 given by the following formula (1) and an end elongation difference ratio ?4 given by the following formula (2):
?2 = (?2 - ?0)/?0 (1) ?4 = (?4 - ?0)/?0 (2) wherein ?0: length (mm) of the material after rolling as measured at breadthwise mid portion of the material, ?2: length (mm) of the material after rolling as measured at breadthwise end portion of the material, and ?4: length (mm) of the material after rolling as measured at breadthwise quarter of the material.
a pair of work rolls, and a plurality of first intermediate rolls, a plurality of second intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
the first intermediate rolls include at least one pair of rolls which have either a crown in which the diameter of each roll decreases toward one end thereof or a crown of a shape of a two-pitch portion of a sine curve, the second intermediate rolls include at least one pair of rolls which have either a crown of a shape of a two-pitch portion of a sine curve or a crown in which the diameter of each roll decreases toward one end thereof, with the proviso that at least one pair of the first and second intermediate rolls have the crown of a shape of a two-pitch portion of a sine curve, the rolls of each pair having the same roll crown are arranged in axially opposite directions to each other, and each roll of the pair of the first intermediate rolls and the pair of the second intermediate rolls is independently shiftable in the axial direction so as to realize a control of the profile of a rolled material in terms of an end elongation difference ratio ?2 given by the following formula (1) and an end elongation difference ratio ?4 given by the following formula (2):
?2 = (?2 - ?0)/?0 (1) ?4 = (?4 - ?0)/?0 (2) wherein ?0: length (mm) of the material after rolling as measured at breadthwise mid portion of the material, ?2: length (mm) of the material after rolling as measured at breadthwise end portion of the material, and ?4: length (mm) of the material after rolling as measured at breadthwise quarter of the material.
20. A 20-high multi-roll cluster rolling apparatus accord-ing to claim 19, wherein the pair of the first intermediate rolls have the crown in which the diameter of each roll decreases toward one end thereof and are arranged in opposite axial directions, and the pair of the second intermediate rolls have the crown of a shape of a two-pitch portion of a sine curve, the rolls of each of the pair being arranged in axially opposite directions to each other.
21. A 20-high multi-roll cluster rolling apparatus accord-ing to claim 19, wherein the pair of the first intermediate rolls have the crown of a shape of a two-pitch portion of a sine curve, and the pair of the second intermediate rolls have the crown in which the diameter of each roll decreases toward one end thereof, the rolls of each of the pair being arranged in axially opposite directions to each other.
22. A 20-high multi-roll cluster rolling apparatus accord-ing to claim 19, wherein the first intermediate rolls include at least one pair of rolls having the crown in which the diameter of each roll decreases toward one end thereof and another pair of rolls which have the crown of a shape of a two-pitch portion of a sine curve.
23. A 12-high multi-roll cluster rolling apparatus having:
a pair of work rolls, and a plurality of intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
the intermediate rolls include at least one pair of rolls which have a crown of a shape of a two-pitch portion of a sine curve, the work rolls and the intermediate rolls include at least one pair of rolls which have a crown in which the diameter of each roll decreases toward one end thereof or a crown of a shape of a one-pitch portion of a sine curve, and the rolls of the pairs are arranged in axially opposite directions to each other, each roll of the pairs being independently shiftable in the axial direction so as to realize a control of the profile of a rolled material in terms of an end elongation difference ratio ?2 given by the following formula (1) and an end elongation difference ratio ?4 given by the following formula (2):
?2 = (?2 - ?0 )/?0 (1) ?4 = (?4 - ?0 )/?0 (2) wherein ?0: length (mm) of the material after rolling as measured at breadthwise mid portion of the material, ?2: length (mm) of the material after rolling as measured at breadthwise end portion of the material, and ?4: length (mm) of the material after rolling as measured at breadthwise quarter of the material.
a pair of work rolls, and a plurality of intermediate rolls and a plurality of backup rolls arranged successively behind each of the work rolls, wherein:
the intermediate rolls include at least one pair of rolls which have a crown of a shape of a two-pitch portion of a sine curve, the work rolls and the intermediate rolls include at least one pair of rolls which have a crown in which the diameter of each roll decreases toward one end thereof or a crown of a shape of a one-pitch portion of a sine curve, and the rolls of the pairs are arranged in axially opposite directions to each other, each roll of the pairs being independently shiftable in the axial direction so as to realize a control of the profile of a rolled material in terms of an end elongation difference ratio ?2 given by the following formula (1) and an end elongation difference ratio ?4 given by the following formula (2):
?2 = (?2 - ?0 )/?0 (1) ?4 = (?4 - ?0 )/?0 (2) wherein ?0: length (mm) of the material after rolling as measured at breadthwise mid portion of the material, ?2: length (mm) of the material after rolling as measured at breadthwise end portion of the material, and ?4: length (mm) of the material after rolling as measured at breadthwise quarter of the material.
24. A 12-high multi-roll cluster rolling apparatus accord-ing to claim 23, wherein the intermediate rolls include at least one pair of rolls having a crown in which the diameter of each roll decreases towards one end thereof, the rolls of the pair being arranged in axially opposite directions to each other.
Applications Claiming Priority (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14105889A JPH0745047B2 (en) | 1989-06-05 | 1989-06-05 | Multi-stage rolling mill |
| JP141057 | 1989-06-05 | ||
| JP141059 | 1989-06-05 | ||
| JP14105789A JPH0745046B2 (en) | 1989-06-05 | 1989-06-05 | Multi-stage rolling mill |
| JP1141059A JPH07102367B2 (en) | 1989-06-05 | 1989-06-05 | Multi-stage rolling mill |
| JP141058 | 1989-06-05 | ||
| JP1147959A JPH0313213A (en) | 1989-06-09 | 1989-06-09 | Multistage rolling mill |
| JP1147960A JPH0313214A (en) | 1989-06-09 | 1989-06-09 | Multistage rolling mill |
| JP1147958A JPH0313212A (en) | 1989-06-09 | 1989-06-09 | Multistage rolling mill |
| JP147960 | 1989-06-09 | ||
| JP147958 | 1989-06-09 | ||
| JP147959 | 1989-06-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2018261A1 CA2018261A1 (en) | 1990-12-05 |
| CA2018261C true CA2018261C (en) | 1994-11-15 |
Family
ID=27552938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002018261A Expired - Fee Related CA2018261C (en) | 1989-06-05 | 1990-06-05 | Multi-roll cluster rolling apparatus |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0401685B2 (en) |
| KR (1) | KR930006110B1 (en) |
| CA (1) | CA2018261C (en) |
| DE (1) | DE69009102T3 (en) |
| FI (1) | FI902759A0 (en) |
| NO (1) | NO178254C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8413476B2 (en) | 2006-06-14 | 2013-04-09 | Siemens Vai Metals Technologies Gmbh | Rolling mill stand for the production of rolled strip or sheet metal |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5179851A (en) * | 1990-12-14 | 1993-01-19 | T. Sendzimir, Inc. | Crown adjustment control system for cluster mills |
| JP3218008B2 (en) * | 1998-03-30 | 2001-10-15 | 株式会社日立製作所 | Cluster type rolling mill and rolling method |
| AT410765B (en) * | 2001-09-12 | 2003-07-25 | Voest Alpine Ind Anlagen | Roll stand for the production of rolled strip |
| CN100333845C (en) * | 2004-08-30 | 2007-08-29 | 宝山钢铁股份有限公司 | Method for designing roller shape and milling roller for inhibiting higher-order wave shape |
| JP5578892B2 (en) * | 2010-03-11 | 2014-08-27 | 株式会社神戸製鋼所 | Multi-stage rolling mill |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN150120B (en) * | 1978-05-19 | 1982-07-24 | Sendzimir Inc T | |
| DE2835514C2 (en) * | 1978-08-12 | 1982-12-02 | Sundwiger Eisenhütte Maschinenfabrik Grah & Co, 5870 Hemer | Device for the axial displacement of conical intermediate rolls in a multi-roll roll stand |
| RU2011448C1 (en) * | 1986-08-05 | 1994-04-30 | Зундвигер Айзенхютте Машиненфабрик Гра унд Ко. | Multiple-roll rolling stand |
| DE3712043C2 (en) * | 1987-04-09 | 1995-04-13 | Schloemann Siemag Ag | Roll stand with axially displaceable rolls |
-
1990
- 1990-05-31 EP EP90110360A patent/EP0401685B2/en not_active Expired - Lifetime
- 1990-05-31 DE DE69009102T patent/DE69009102T3/en not_active Expired - Fee Related
- 1990-06-01 NO NO902458A patent/NO178254C/en not_active IP Right Cessation
- 1990-06-04 FI FI902759A patent/FI902759A0/en not_active Application Discontinuation
- 1990-06-05 KR KR1019900008290A patent/KR930006110B1/en not_active IP Right Cessation
- 1990-06-05 CA CA002018261A patent/CA2018261C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8413476B2 (en) | 2006-06-14 | 2013-04-09 | Siemens Vai Metals Technologies Gmbh | Rolling mill stand for the production of rolled strip or sheet metal |
Also Published As
| Publication number | Publication date |
|---|---|
| FI902759A0 (en) | 1990-06-04 |
| NO902458L (en) | 1990-12-06 |
| NO902458D0 (en) | 1990-06-01 |
| DE69009102T2 (en) | 1994-09-29 |
| KR930006110B1 (en) | 1993-07-07 |
| NO178254C (en) | 1996-02-21 |
| EP0401685A1 (en) | 1990-12-12 |
| DE69009102T3 (en) | 2001-02-08 |
| EP0401685B1 (en) | 1994-05-25 |
| KR910000254A (en) | 1991-01-29 |
| DE69009102D1 (en) | 1994-06-30 |
| EP0401685B2 (en) | 2000-03-08 |
| NO178254B (en) | 1995-11-13 |
| CA2018261A1 (en) | 1990-12-05 |
| AU604620B1 (en) | 1990-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |