Title of Invention

ROLLING MILL AND ROLLING METHOD

Abstract A rolling mill and a rolling method capable of performing uniform wiping in a plate width direction by uniformizing a pressing force against a rolled material in the plate width direction to prevent it from being deformed. The rolled material (S) is wiped by a pair of upper and lower hollow first wiper rolls (12a, 12b) to which crowning shape is applied. The rolled material (S) is further wiped by a pair of upper and lower hollow second wiper rolls (14a, 14b) to which crowning shape is applied while preventing a coolant (C) from being spattered and re-adhered to the rolled material (S). The coolant (C) discharged from near the end part of the rolled material (S) wiped by the second wiper rolls (14a, 14b) is removed by jetting air (A) from the downstream side of the rolled material in the rolling direction.
Full Text FORM 2
THE PATENT ACT 1970 (39 of 1970)
The Patents Rules, 2003 COMPLETE SPECIFICATION
(See Section 10, and rule 13)
1. TITLE OF INVENTION
ROLLING MILL AND ROLLING METHOD

2. APPLICANT(S)
a) Name
b) Nationality
c) Address

MITSUBISHI-HITACHI METALS MACHINERY, INC.
JAPANESE Company
34-6, SHIBA 5-CHOME,
MINATO-KU, TOKYO 1080014,
JAPAN

3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed : -

DESCRIPTION
Technical Field
The present invention relates to a rolling mill provided with a wiper device for removing foreign matters adhered to a surface of a rolling material and also relates to a rolling method.
Background Art
In general, in a rolling mill, working rolls and a rolling material are constantly heated by frictional heat and processing heat generated during rolling. When temperature of the working rolls and the rolling material becomes high, rolling accuracy is deteriorated and also burn-in of the rolling material and the working rolls occurs. As a result, the surface quality of a product may be deteriorated. For this reason, to prevent excessive temperature rise of the working rolls and the rolling material, a coolant is sprayed onto surfaces of the working rolls and the rolling material for cooling and lubrication.
The rolling material rolled by the rolling mills is to be eventually wound in a coil shape. However, if the above-mentioned coolant remains adhered to the surface of the rolling material, the rolling material slips during winding, which causes telescopic slide in the axial direction. Consequently, operational stability is deteriorated. In addition, in an annealing process in a downstream operation, gloss unevenness or rust is caused to considerably deteriorate the surface quality of the rolling material.
To prevent the above-mentioned problem, there is provided a wiper device for removing adhered matters such as the coolant from the surface of the rolling material on an outgoing side of the rolling mills. Such a conventional rolling mill provided with a wiper device is disclosed in, for example, Patent Documents 1 and 2.
[Patent Document 1]: Japanese Patent Application Laid-open Publication No.
H5-293531
[Patent Document 2]: Japanese Patent Application Laid-open Publication No.
H10-146611
Disclosure of the Invention
Problems to be Solved by the Invention
However, in patent document 1, it is necessary to supply lubricant to bearings of plural short backup rolls supporting wiper rolls. In addition, the lubricant has to be
2

collected for each bearing to prevent the lubricant from dispersing. As a result, the structure of the apparatus becomes complicated. In addition, when performing high-speed rolling, high load is applied to the small bearings. As a result, the lifetime of the apparatus becomes shorter, and running costs increase and productivity is decreased. Furthermore, since the removed coolant adheres to the outer-side surfaces of the wiper rolls than a plate width, and disperses towards downstream of a rolling direction by the centrifugal force of its rotation. As a result, the dispersed coolant may readhere onto the surface of the rolling material. Moreover, the deflection of the wiper rolls is to be corrected by pressing devices provided at both ends thereof. However, since a diameter of the wiper roll is small, its pressing force is limited to portions near the plate ends, and there is no uniformity in the deformation correction and the pressing force over an entire region in the plate width direction. As a result, in the plate width direction of the rolling material, a coolant removal effect becomes uneven, whereas waviness is generated in the length direction.
In Patent Document 2, since air is sprayed to the width direction of the rolling material after the rolling material passed through the wiper rolls and the air is vacuumed from both width side ends, a vacuum aspiration device for vacuuming the air needs to be introduced, which requires additional cost. In addition, by providing such a vacuum aspiration device or the like, in a reversible rolling mill, the distance to a winding device for winding the rolling material becomes longer, and the distance of yet-to-be rolled portion or the distance to various measuring instruments becomes longer, which leads to a decrease in the production yield. Furthermore, similar to patent document 1, the dispersed coolant may readhere onto the surface of the roller member.
The present invention has been made to solve the above-mentioned problems. Accordingly, it is an object of the present invention to provide a rolling mill and a rolling method to prevent deformation of a rolling material by equalizing pressing force in the plate width direction of the rolling material and to perform uniform wiping in the plate width direction.
Means for Solving the Problems
A rolling mill according to a first aspect of the present invention to solve the above-mentioned problem includes:
Working rolls which are formed of a pair of upper and lower rolls to roll a rolling material;
a coolant device for supplying a coolant for cooling and lubricating the rolling
3

material and the working rolls; and
a wiper device for removing the coolant adhered to the rolling material. The rolling mill is characterized in that the wiper device wipes the rolling material from an upstream of a rolling direction and includes first wiper rolls which are formed of a pair of upper and lower crowning-processed hollow rolls, a shielding portion for preventing the coolant from dispersing and readhering onto the rolling material, second wiper rolls which wipes the rolling material and are formed of a pair of upper and lower crowning-processed hollow rolls, and an air spraying device for spraying air from a downstream-side position of the rolling direction to a vicinity of ends of the rolling material wiped by the second wiper rolls.
In the rolling mill according to the first aspect of the present invention, a rolling mill according to a second aspect of the present invention to solve the above-mentioned problem is characterized by comprising shaft-end supporting members, each of which supports each of shaft-ends of the first and second wiper rolls, and a structure supporting member for supporting the shaft-end supporting members so as to be movable in upper and lower directions.
In the rolling mill according to the second aspect of the present invention, a rolling mill according to a third aspect of the present invention to solve the above-mentioned problem is characterized in that the first and second wiper rolls are flat rolls, which are arranged in such a manner that upper and lower roll shafts would be crossed with each other in the plate width direction, and the first and second wiper rolls are arranged so as to be crossed in a same direction.
In the rolling mill according to the third aspect of the present invention, a rolling mill according to a fourth aspect of the present invention to solve the above-mentioned problem is characterized in that the first and second wiper rolls are arranged so as to be crossed in the directions opposite to each other.
In the rolling mill according to the third or fourth aspect of the present invention, a rolling mill according to a fifth aspect of the present invention to solve the above-mentioned problem is characterized by comprising a cross angle setting mechanism for setting a cross angle on the basis of the plate width of the rolling material.
In the rolling mill according to the second aspect of the present invention, a rolling mill according to a sixth aspect of the present invention is characterized in that the first wiper rolls to which the shaft-end members are attached and the second wiper
4

rolls to which the shaft-end members are attached are arranged in mutually exchangeable.
In a rolling method for supplying a coolant for cooling and lubrication during rolling and thereafter removing the coolant adhered to a rolling material, a rolling method according to a seventh aspect of the present invention to solve the above-mentioned problem is characterized by wiping the rolling material by first wiper rolls which are formed of a pair of upper and lower crowning-processed hollow rolls, preventing the coolant from dispersing and readhering onto the rolling material, further wiping the rolling material by second wiper rolls which are formed of a pair of upper and lower crowning-processed hollow rolls, and removing the coolant discharged from a vicinity of end portions of the rolling material to be wiped by the second wiper rolls by spraying air from the downstream-side position of a rolling direction.
In the rolling method according to the seventh aspect of the present invention, a rolling method according to an eighth aspect of the present invention to solve the above-mentioned problem is characterized in that the first and second wiper rolls are flat-processed and upper and lower roll shafts are arranged so as to be crossed with each other in the plate width direction.
In the rolling method according to the seventh or eighth aspect of the present invention, a rolling method according to a ninth aspect of the present invention to solve the above-described problem is characterized in that at least one of a crowning process and cross arrangement is applied to the second wiper rolls.
Effects of the Invention
According to the rolling mill in accordance with the first aspect of the present invention, in a rolling mill provided with working rolls formed of a pair of upper and lower rolls to roll a rolling material, a coolant device for supplying a coolant for cooling and lubricating the rolling material and the working rolls, and a wiper device for removing the coolant adhered to the rolling material, the wiper device is provided with first wiper rolls which wipe the rolling material from an upstream of the rolling direction and are formed of a pair of upper and lower crowning-processed hollow rolls, a shielding member for preventing the coolant from dispersing and readhering onto the rolling material, second rolls which wipe the rolling material and are formed of upper and lower crowning-processed hollow rolls, and an air spraying device for spraying air from a downstream-side position of the rolling direction onto a vicinity of end portions of the rolling material to be wiped by the second wiper rolls, so that
5

pressing force in the plate width direction of the rolling material can become uniform to prevent deformation and wiping can be evenly performed in the plate width direction.
According to the rolling mill in accordance with the second aspect of the present invention, in the rolling mill in accordance with the first aspect of the present invention, there are provided shaft-end supporting members, each of which supports each of shaft-ends of the first and second wiper rolls, and a structure supporting member for supporting the shaft-end supporting members so as to be movable in upper and lower directions, so that maintenanceability of operations such as alignment of the wiper rolls, roll exchange, and the like can be improved and strength can be reinforced.
According to the rolling mill in accordance with the third aspect, in the rolling mill in accordance with the second aspect of the present invention, the first wiper rolls and the second wiper rolls are flat rolls, which are arranged in such a manner that upper and lower roll shafts would be crossed with each other in the plate width direction, and the first and second wiper rolls are arranged so as to be crossed in a same direction, so that pressing force in the plate width direction of the rolling material can become even to prevent deformation, and wiping can be evenly performed in the plate width direction.
According to the rolling mill in accordance with the fourth aspect of the present invention, in the rolling mill in accordance with the third aspect of the present invention, the first and second wiper rolls are arranged so as to be crossed in the directions opposite to each other, so that the rolling material can be stably conveyed.
According to the rolling mill in accordance with the fifth aspect of the present invention, in the rolling mill in accordance with the third or fourth aspect of the present invention, a cross angle setting mechanism is provided for setting a cross angle on the basis of the plate width of the rolling material, so that the cross angle can be easily changed.
According to the rolling mill in accordance with the sixth aspect of the present invention, in the rolling mill in accordance with the second aspect of the present invention, the first wiper rolls to which the shaft-end members are attached and the second wiper rolls to which the shaft-end members are attached are arranged so as to be mutually exchanged, so that maintenanceability can be improved.
6

According to the rolling method in accordance with the seventh aspect of the present invention, in a rolling method for supplying a coolant for cooling and lubrication during rolling and thereafter removing the coolant adhered to a rolling material, the rolling material is wiped by first wiper rolls which are formed of a pair of upper and lower crowning-processed hollow rolls, the coolant is prevented from dispersing and readhering onto the rolling material, the rolling material is further wiped by second wiper rolls which are formed of a pair of upper and lower crowning-processed hollow rolls, and the coolant discharged from a vicinity of end portions of the rolling material to be wiped by the second wiper rolls is removed by spraying air from a downstream-side position of the rolling direction, so that pressing force of the rolling material in the plate width direction can become uniform to prevent deformation and wiping can be evenly performed in the plate width direction.
According to the rolling method in accordance with the eighth aspect of the present invention, in the rolling method in accordance with the seventh aspect, the first and second wiper rolls are flat-processed and upper and lower roll shafts are arranged so as to be crossed with each other in the plate width direction, so that pressing force of the rolling material in the plate width direction can become uniform to prevent deformation and wiping can be evenly performed in the plate width direction.
According to the rolling method in accordance with the ninth aspect of the present invention, in the rolling method in accordance with the seventh or eighth aspect of the present invention, at least one of a crowning process and cross arrangement is applied to the second wiper rolls, so that wiping can be evenly performed in the plate width direction of the rolling material.
Brief Description of the Drawings
[FIG. 1] FIG. 1 is a schematic view of a rolling mill according to one embodiment of
the present invention.
[FIG. 2] FIG. 2 is a schematic view of a wiper device.
[FIG. 3] FIG. 3 is a cross-sectional view of a crowning-processed wiper roll.
[FIG. 4] FIG. 4 is a schematic view showing a supporting structure of the wiper rolls. [FIG. 5] FIG. 5 is a cross-sectional view of the crowning-processed wiper roll.
[FIG. 6] FIG. 6 is a graph showing contact pressure of the crowning-processed wiper
rolls and flat-processed wiper rolls during rolling.
[FIG. 7] FIG. 7 is a cross-arrangement view of the flat-processed wiper rolls in
another wiper device.
[FIG. 8] FIG. 8 is a top view of FIG. 7.
7

[FIG. 9] FIG. 9 is another cross-arrangement view of flat-processed wiper rolls in
another wiper device. [FIG. 10] FIG. 10 is a top view of FIG. 9. [FIG. 11] FIG. 11 is a graph showing contact pressure of the crowning-processed
wiper rolls and the flat-processed wiper rolls in the cross-arrangement
during rolling.
[FIG. 12] FIG. 12 is a schematic view of a rolling mill according to another
embodiment of the present invention.
Reference Numerals
1, 24 Rolling mill, 2,3Rolling stand, 4 Coolant header, 5,23 Wiper device, 6a, 6b, 9a,
9b Working roll, 7a, 7b, 10a, 10b Intermediate roll, 8a, 8b, 11a, lib Reinforcing
roll, 12a, 12b, 21a, 21b First wiper roll, 13a, 13b Shielding plate, 14a, 14b, 22a, 22b
Second wiper roll, 15a, 15b Air spraying device, 16a, 16b, 17a, 17b Shaft-end
supporting member, 18 Housing, 19 Supporting structure, 20 Groove, 25 Winding
device
Best Modes for Carrying out the Invention
Next, an embodiment of the present invention will be described in detail by using the drawings. FIG. 1 is a schematic view of a rolling mill according to one embodiment of the present invention. FIG. 2 is a schematic view of a wiper device. FIG. 3 is a cross-sectional view of a crowning-processed wiper roll. FIG. 4 is a schematic view showing a supporting structure of the wiper rolls. FIG. 5 is a cross-sectional view of a flat-processed wiper roll. FIG. 6 is a graph showing contact pressure of the flat-processed wiper rolls and crowning-processed wiper rolls during rolling. FIG. 7 is a cross-arrangement view of flat-processed wiper rolls in another wiper device. FIG. 8 is a top view of FIG. 7. FIG. 9 is another cross-arrangement view of flat-processed wiper rolls in another wiper device. FIG. 10 is a top view of FIG. 9. FIG. 11 is a graph showing contact pressure of the crowning-processed wiper rolls and the cross-arrangement flat-processed wiper rolls during rolling. FIG. 12 is a schematic view of a rolling mill according to another embodiment of the present invention. It is to be noted that an arrow in the figures show a rolling direction.
As shown in FIG. 1, a tandem type rolling mill 1 is formed of a first-stage rolling stand
2, a second-stage rolling stand 3, coolant headers 4, and a wiper device 5. The rolling
stands 2 and 3 have a same configuration, that is, the rolling stand 2 is provided with
working rolls 6a and 6b for rolling a rolling material S, intermediate rolls 7a and 7b for
8

supporting these working rolls 6a and 6b, and reinforcing rolls 8a and 8b for supporting these intermediate rolls 7a and 7b, whereas the rolling stand 3 is similarly provided with working rolls 9a and 9b for rolling a rolling material S, intermediate rolls 10a and 10b for supporting these working rolls 9a and 9b, and reinforcing rolls 11a and lib for supporting these intermediate rolls 10a and 10b.
Each coolant header 4 has a configuration in which a plurality of nozzles (not shown) is arranged in the width direction of the rolling material S. The coolant headers 4 are provided in upstream and downstream of a rolling direction of the working rolls 6a, 6b, 9a and 9b for spraying a coolant C (water, oil, or a mixture of water and oil) for cooling and lubricating the rolling material S and the working rolls 6a, 6b, 9a, and 9b from upper and lower directions.
As shown in FIG. 2, the wiper device 5 is provided in the downstream of the rolling direction of the second-stage stand 3 for removing adhered materials such as the coolant C adhered to the surface of the rolling material S. The wiper device 5 is provided with a pair of upper and lower first wiper rolls 12a and 12b, upper and lower shielding plates 13a and 13b, a pair of upper and lower second wiper rolls 14a and 14b, and air spraying devices 15a and 15b in this order from the upstream of the rolling direction.
As shown in FIG. 3, each of the wiper rolls 12a, 12b, 14a and 14b is thin in a hollowed shape and is crowning-processed. An outer diameter of the center portion in its axial direction is thick and is formed so as to be tapered towards end portions. Then, as shown in FIG. 4, the wiper rolls 12a, 12b, 14a, and 14b are provided so as to sandwich the rolling material S from the upper and lower directions. Both ends of the first wiper rolls 12a and 12b are rotatably supported by shaft-end supporting members 16a and 16b and both ends of the second wiper rolls 14a and 14b are rotatably supported by shaft-end supporting members 17a and 17b. That is, the wiper rolls 12a, 12b, 14a and 14b are formed so as to cooperate with the rolling material S.
As shown in FIG. 4, the wiper device 5 is provided with a housing 18, and a structure supporting member 19 is supported in a substantially center portion of the rolling direction thereof. The shaft-end supporting members 16a and 16b are supported so as to be movable in upper and lower directions between the inner surface of the housing 18 in the upstream of the rolling direction and the structure supporting member 19. The shaft-end supporting members 17a and 17b are also supported so as to be movable in upper and lower directions between the inner surface of the housing 18 in the downstream of the rolling direction and the structure supporting member 19.
9

Then, the shaft-end supporting members 16a, 16b, 17a, and 17b are formed in a substantially same shape, and the shaft-end supporting members 16a and 17a and the shaft-end supporting members 16b and 17b are alternately exchangeable, each of which is independently movable.
In addition, as shown in FIG. 2, the upper shielding plate 13a is supported between the first wiper roll 12a and the second wiper roll 14a above a substantially center in the rolling direction of the wiper device 5 (housing 18), and a groove 20 is elongated in the plate width direction (an axial direction of the wiper rolls 12a and 12b) at a lower portion thereof. The groove 20 may generally have a length longer than a maximum plate width of the rolling material S and be set to about a barrel length of the first wiper rolls 12a and 12b. On the other hand, the lower shielding plate 13b is supported between the first wiper roll 12b and the second wiper roll 14b under a substantially center in the rolling direction of the wiper device 5 (housing 18). Then, each of the air spraying devices 15a and 15b has a configuration in which a plurality of nozzles (not shown) is arranged in the width direction of the rolling material S. The air spraying devices 15a and 15b spray air A onto the rolling material S and the second wiper rolls 14a and 14b from the upper and lower directions in the downstream of the rolling direction of the second wiper rolls 14a and 14b, so that adhered matters such as the coolant C adhered to the surfaces of the rolling material S and the second wiper rolls 14a and 14b are removed.
Next, the rolling material S which passed through the wiper device 5 is conveyed to a winding device (not shown) to be wound in a coil shape.
Accordingly, the rolling material S to be conveyed is rolled between the rotating working rolls 6a and 6b and the working rolls 9a and 9b to have a predetermined plate thickness by adjusting pressing force and bending force. At this time, deflection of the working rolls 6a, 6b, 9a, and 9a is always corrected by a group of rolls such as the intermediate rolls 7a, 7b, 10a, and 10b supporting them from backside thereof, and the reinforcing rolls 8a, 8b, 11a, and lib, and the like. It is to be noted that a configuration of the roll group supporting from the backside in the above-mentioned present embodiment is not limited to this, and it is also possible to support from the vertical direction by a plurality of roll groups or by a plurality of multi-stage roll groups which are arranged in a cluster form.
In addition, during rolling, frictional heat and processing heat are generated between the rolling material S and the working rolls 6a and 6b or the working rolls 9a and 9b, which increases temperature of the rolling material S, and the working rolls 6a, 6b, 9a,
10

and 9b. However, the coolant C is sprayed from the coolant headers 4, so as to be capable of cooling and lubricating the working rolls. The configuration of each coolant header 4 may be one-line or plural-line configuration. In addition, a supplying method thereof may be a zone-coolant method in which a plurality of nozzles is turned ON/OFF at the same time, a spot coolant method in which each nozzle is turned ON/OFF, or the like. Furthermore, as for the coolant during high-speed rolling of 1000 meter per minute or more, a high cooling performance is required. Thus, a coolant in which water and oil are mixed is used. The mixing ratio of oil to water at this time is, for example, 3% to 5%, but the value is not limited to these.
Then, the rolling material S onto which the coolant C is sprayed during rolling is conveyed to the wiper device, and is wiped by being held between the first wiper rolls 12a and 12b and between the second wiper rolls 14a and 14b. Thus, the coolant C is removed.
Here, in a general rolling line, it is a well-known fact that acceleration or deceleration is involved in portions before and after passing through a welding point between a leading rolling material and a following rolling material in the tandem type rolling mill 1, and in front end and rear end portions of the rolled member in a reverse type rolling mill 24, which will be described later. Accordingly, when a weight of wiper rolls with no rotation driving force by itself becomes larger, the wiper rolls may not be able to follow the acceleration or deceleration of the rolling material due to inertial force of the wiper rolls. As a result, there is caused a difference in speed between the rolling material and the wiper rolls to cause slip of the wiper rolls. When the slip is caused, scuff marks are made in the rolling material, which leads to deterioration of the quality of the rolling material or deterioration of yield. As a result, it does not satisfy basic performances as a wiper device.
Thus, in the present invention, the hollowed first wiper rolls 12a and 12b and the hollowed second wiper rolls 14a and 14b are provided to reduce the inertial force and prevent the slip, so that the deterioration of the quality of the rolling material S or the deterioration of yield can be prevented and they become applicable to the high-speed rolling.
In a conventional rolling mill, the wiper rolls obtain rotation driving force from the rolling material and backup rolls for the wiper also obtain rotation driving force from the wiper rolls. For this reason, the backup rolls slip because they cannot follow the acceleration or deceleration of the rolling material, and scuff marks are made on the
11

both rolls. As a result, the scuff marks are transferred onto the rolling material and lead the deterioration in quality of the rolling material. To prevent the slip between the backup rolls and the wiper rolls, reducing an acceleration and deceleration rate, can be made, but it causes the deterioration of productivity. Thus, it is not preferable.
Accordingly, in the present invention, since the backup rolls are not used, there can be avoided an increase of running costs due to deterioration of the life of the backup roll bearings and complication of equipment due to installation of a bearing lubrication mechanism. Furthermore, the yield is improved to reduce the costs for introducing the equipment and for running, so that maintenanceability can be improved.
As described above, since the wiper rolls 12a, 12b, 14a, and 14b are supported by the shaft-end supporting members 16a, 16b, 17a, and 17b at both ends thereof, if flat-processed wiper rolls (wiper rolls 21a, 21b, 22a, and 22b, which will be described later) as shown in FIG. 5 are simply provided, pressing force to a rolling material, that is, contact pressure between the rolling material S and the first wiper rolls 12a and 12b or the second wiper rolls 14a and 14b becomes uneven. As a result, the shape of the rolling material may be deflected. In addition, unevenness in wiping performance is caused in the plate width direction.
Here, referring to FIG. 6, contact pressure in the width direction of the crowning-processed wiper rolls is compared with that of the flat-processed wiper rolls. In FIG. 6, the contact pressure of the crowning-processed wiper rolls is shown by a solid line, and the contact pressure of the flat-processed wiper rolls is shown by an alternate long and short dash line.
As shown in FIG. 6, as for the flat-processed wiper rolls, it can be observed that the contact pressure is low in the center portion of the plate width and becomes higher towards plate end portions. It means that coolant removability is deteriorated (the amount of residual oil is large) in a portion where the contact pressure is low, whereas the wiping performance becomes excessively large to deflect the shape of the rolling material in a portion where the contact pressure is high. In contrast, as for the crowning-processed wiper rolls, there are portions where the contact pressure is slightly higher in the vicinity of the plate ends, but the curve is substantially smooth within the entire plate width, meaning that the contact pressure can be constantly applied. With this, the coolant removability becomes substantially equal in the width direction of the rolling material. As a result, the shape rolled by the working rolls is maintained and the abnormal deformation of the plate shape does not occur. In addition, in FIG. 6, contact pressure distribution while changing the plate width of
12

the rolling material is also shown. When the plate width is changed, as for the flat-processed wiper rolls, the contact pressure distribution in the plate width direction is uneven. In contrast, as for the crowning-processed wiper rolls, the contact pressure distribution in the plate width direction is hardly changed even if the plate width is changed, meaning that substantially constant contact pressure can be applied.
In this manner, the crowning-processed wiper rolls 12a, 12b, 14a, and 14b are provided so that substantially constant contact pressure can be applied in the plate width direction without depending on a plate width of the rolling material S and coolant performance also can be equally formed in the plate width direction. In addition, since the shape of the rolling material S can be maintained, generation of waviness in the longitudinal direction or scuff marks can be prevented.
As for a coolant removing method, the coolant C which is formed on the surface of the rolling material S in a thick layer is firstly removed by the first wiper rolls 12a and 12b. The coolant C adhered to the surface of the rolling material S is carried by the wiping of the first wiper rolls 12a and 12b to the outside of the width direction of the rolling material S or to the upstream of the rolling direction. The coolant carried to the outside of the plate width directly and downwardly drops under the rolling material S or mounts on the surface of gap between the first wiper rolls 12a and 12b, which are outside of the plate width, to be carried to the downstream of the rolling direction. At this time, the first wiper rolls 12a and 12b are rotated in accordance with the conveyance of the rolling material S, and the coolant C disperses by centrifugal force thereof.
The upper and lower shielding plates 13a and 13b are provided to prevent the dispersing coolant C from readhering onto the surface of the rolling material S, and have different configurations. That is, the upper shielding plate 13a is formed in a plate form, and a groove 20 is provided at an end thereof for collecting the coolant C, which is dispersed upward, and discharges outwardly in the width direction of the rolling material S. In contrast, the lower shielding plate 13b is formed in a plate form, and is formed so that the coolant C, which is dispersed downward, is collected to discharge outwardly or downwardly in the width direction of the rolling material S.
In this manner, the readhesion of the coolant C onto the rolling material S is prevented after passing through the first wiper rolls 12a and 12b, so that a film thickness of the coolant C adhered to the surface of the rolling material S can be as thin as possible at the time of being conveyed to the second wiper rolls 14a and 14b. With this, the load
13

of removing the coolant C by the second wiper rolls 14a and 14b can be reduced.
After that, the thin residue of the coolant C on the surface of the rolling material S is further wiped by the second wiper rolls 14a and 14b. Judging from the maintenanceability, it is preferable that the second wiper rolls 14a and 14b have a same specification as that of the first wiper rolls 12a and 12b. Furthermore, the coolant C which is removed to the outside of the width direction of the rolling material S by the wiping of the second wiper rolls 14a and 14b downwardly drops from the second wiper rolls 14a and 14b in the outside of the plate width, or adheres onto the surfaces of the second wiper rolls 14a and 14b to be carried towards the downstream of the rolling direction in accordance with the rotation thereof. Here, a total amount of the coolant C carried for every rotation is extremely small when compared with that of the coolant C carried by the first wiper rolls 12a and 12b. For this reason, the coolant C does not disperse during the wiping of the second wiper rolls 14a and 14b.
However, along with the progress of rolling, the coolant C continuously adheres onto the surfaces of the second wiper rolls 14a and 14b. If this is left unremoved, it may be a cause of dispersion. For this reason, air A is sprayed from the air spraying devices 15a and 15b from the downstream of the rolling direction in relation to the vicinity of both ends of the rolling material S at the second wiper rolls 14a and 14b, so that the coolant C accumulated on the surfaces of the second wiper rolls 14a and 14b is blown away from the rolling material S and the second wiper rolls 14a and 14b. Since the amount of the coolant C adhered to the surface of the second wiper rolls 14a and 14b is extremely small, there is no need to collect the air A containing the flown-away coolant C.
In a conventional rolling mill, there are needed to be provided between first wiper rolls and second wiper rolls a blower device for supplying air to an entire region of the width direction of a rolling material, a device for vacuuming supplied air, and a vacuum aspiration source. However, in the present invention, the upper and lower shielding plates 13a and 13b are provided for preventing the dispersing coolant C from readhering, so that the removability of coolant can be maintained and equipment costs can be reduced.
In addition, the shaft-ends of the wiper rolls 12a, 12b, 14a, and 14b are independently supported by the shaft-end supporting members 16a, 16b, 17a, and 17b, so that the maintenanceability of operations such as axial alignment of rolls, roll exchange, and the like can be improved. Furthermore, the strength of the housing 18 can be
14

reinforced by the structure supporting member 19, which can contributes to provide thinner housing 18.
Accordingly, by having the above-mentioned configuration, the wiper device 5 can be compact, having a small number of parts, so that initial costs and running costs can be reduced. Moreover, since the wiper device 5 becomes compact, a distance from the rolling mill 1 to the winding device can be short, so that the yield can be improved. In addition, distances to a plate thickness meter and a shape detecting device arranged in the outer side of the working rolls 6a and 6b or the working rolls 9a and 9b can be short, so that rolling accuracy can be improved.
Next, a description will be given of a case shown in FIG. 5 where flat-processed first wiper rolls 21a and 21b and second wiper rolls 22a and 22b are provided.
As shown in FIGS. 7 and 8, a wiper device 23 is provided with first wiper rolls 21a and 22a which are formed of a pair of upper and lower rolls, upper and lower shielding plates 13a and 13b, second wiper rolls 22a and 22b which are formed of a pair of upper and lower rolls, and air spraying devices 15a and 15b, in this order from the upstream of a rolling direction. The wiper rolls 21a, 21b, 22a, and 22b are thin hollowed shapes and are flat-processed. In addition, the first wiper rolls 21a and 21b and the second wiper rolls 22a and 22b are arranged in such a manner that upper and lower roll shafts are crossed with each other in the plate width direction. The pair of the upper and lower first wiper rolls 21a and 21b and the pair of the upper and lower second wiper rolls 22a and 22b are cross-arranged in a same direction with a predetermined cross angle.
Here, referring to FIG. 11, contact pressure in the width direction of the rolling material of the crowning-processed wiper rolls is compared with that of the cross-arrangement flat-processed wiper rolls. In FIG. 11, the contact pressure of the crowning-processed wiper rolls is shown by a solid line, and the contact pressure of the cross-arrangement flat-processed wiper rolls is shown by an alternate long and short dash line.
As shown in FIG. 6, if the flat-processed wiper rolls are arranged without being crossed, unevenness in the contact pressure is caused in the plate width direction. However, as shown in FIG. 11, the flat-processed wiper rolls are cross-arranged, so that contact pressure distribution substantially equivalent of that of the crowning-processed wiper rolls can be obtained. Similar effects can be also obtained even if the plate width of the rolling material is changed.
15

In addition, as shown in FIGS. 9 and 10, it is possible that the first wiper rolls 21a and 21b and the second wiper rolls 22a and 22b are arranged in such a manner that a direction of the cross-arrangement is oppositely set. In a case of the cross-arrangement, since a rolling direction and a rotation direction of each roll are shifted by a cross angle, there is a concern about torsion. However, since they are cross-arranged, moment is balanced on an upper surface side of the rolling material S, which comes in contact with the first wiper roll 21a and the second wiper roll 22a, balanced on a lower surface side of the rolling material S, which comes in contact with the first wiper roll 21a and the second wiper roll 22b, and on the entire upper and lower surfaces, so that the rolling material S can be more stably conveyed.
Accordingly, even if the cross-arrangement flat-processed wiper rolls 21a, 21b, 22a, and 22b are provided, they do not depend on the plate width of the rolling material and substantially constant contact pressure can be applied in the plate width direction and the coolant removability also equally formed in the plate width direction. In addition, since the shape of the rolling material S can be maintained, generation of waviness in the longitudinal direction of the rolling material S or scuff marks can be prevented.
In addition, the wiper rolls 21a, 21b, 22a, and 22b are independently supported by the axial-end supporting members 16a, 16b, 17a, and 17b as shown in FIG. 4 and are supported by a cross angle setting mechanism (not shown) capable of setting a plurality of cross angles, so that the cross angle can be easily changed. It is to be noted that when the plate width of the rolling material S is wide, the cross angle is controlled so as to be large, and when the plate width is narrow, the cross angle is controlled so as to be small. Thus, maintenanceability of operations such as axial alignment of each roll, roll exchange, and the like can be improved.
It is to be noted that similar effects can be obtained even if the crowning-processed wiper rolls 12a, 12b, 14a, and 14b are cross-arranged. Furthermore, if one of the wiper rolls 12a and 12b is crowning-processed and the other is flat-processed and/or if one of the wiper rolls 14a and 14b is crowning-processed and the other is flat-processed, similar effects can be also obtained.
In addition, if nonmetal rolls such as nonwoven fabric rolls, or the like are used for the first wiper rolls 12a and 12b, similar effects can be obtained by applying at least one of the crowning process and cross-arrangement to the second wiper rolls 14a and 14b. Even in a case where the crowning-processed rolls are used, as described above, one of the second wiper rolls 14a and 14b may be crowning-processed and the other may
16

be flat-processed.
In the present embodiment, the description has been given of the tandem type rolling mill 1. However, as shown in FIG. 12, the present embodiment is also applicable to a reverse type rolling mill 24.
As shown in FIG. 12, the rolling mill 24 is provided with coolant headers 4 at both ends of a rolling stand 2 and wiper devices 5 at both ends thereof, and is further provided with winding devices 25 at both ends thereof. In the reverse type rolling mill 24, a rolling direction changes for every pass. According to the pass, a rolling material S is wound by the outgoing and ingoing winding devices 25. For this reason, it is also needed to provide wiper devices 5 on outgoing and ingoing sides. In this case, the wiper device 5 provided on the ingoing side of each pass direction of the rolling material S sandwiches the rolling material S from upper and lower directions, and is used for preventing a coolant C supplied on the ingoing side from reverse flow. In contrast, the wiper device 5 provided on the outgoing side can provide similar effects as described above.
Thus, according to the rolling mill in accordance with the present invention, the rolling mill 1 is provided with working rolls 6a and 6b and working rolls 9a and 9b, which are formed of a pair of upper and lower rolls for rolling a rolling material S, coolant headers 4 for supplying a coolant C for cooling and lubricating the rolling material S and the working rolls 6a, 6b, 9a, and 9b, wiper devices 5 for removing the coolant adhered to the rolling material S. In the rolling mill 1, the wiper device 5 includes first wiper rolls 12a and 12b which wipe the rolling material S and are formed of a pair of upper and lower crowning-processed hollow rolls, upper and lower shielding plates 13a and 13b for preventing the coolant C from dispersing and readhering onto the rolling material S, second wiper rolls 14a and 14b which wipe the rolling material and are formed of a pair of upper and lower crowning-processed hollow rolls, and air spraying devices 15a and 15b for spraying air A from a downstream of the rolling direction to a vicinity of ends of the rolling material S wiped by the second wiper rolls 14a and 14b, in this order from an upstream of a rolling direction. With this, even if a plate width of the rolling material changes, pressing force can be evenly applied in the plate width direction and waviness in the longitudinal direction can be suppressed, so that wiping can be evenly performed in the plate width direction. In addition, even at the time of high-speed rolling and in an acceleration or deceleration region of a rolling speed, the wiper rolls 12a, 12b, 14a, and 14b do not slip on the rolling material S, so that scuff marks can be suppressed. Furthermore, the wiper devices 5 become compact, so that initial costs and running
17

costs can be reduced. In addition, distances to each detector and winding devices can be short, so that rolling accuracy as well as yield can be improved.
In addition, there are provided the shaft-end supporting members 16a and 16b and the shaft-end supporting member 17a and 17b for respectively supporting the shaft-ends of the first wiper rolls 12a and 12b and the shaft-ends of the second wiper rolls 14a and 14b, and a structure supporting member 19 for supporting the shaft-end supporting members 16a, 16b, 17a and 17b so as to be movable in upper and lower directions. With this, maintenanceability of operations such as axial alignment of wiper rolls 12a, 12b, 14a, and 14b, roll exchange, and the like can be improved and strength of the wiper devices 5 can be reinforced.
In addition, the flat-processed first wiper rolls 21a and 21b and second wiper rolls 22a and 22b are arranged in such a manner that upper and lower roll shafts are crossed with each other in the plate width direction and the first wiper rolls 21a and 21b and the second wiper rolls 22a and 22b are crossed in a same direction, so that pressing force in the plate width direction of the rolling material S is made even to prevent deformation and wiping can be evenly performed in the plate width direction.
In addition, the first wiper rolls 21a and 21b and the second wiper rolls 22a and 22b are arranged so as to be crossed in the directions opposite to each other, so that the rolling material S can be stably conveyed.
Furthermore, there is provided a cross angle setting mechanism for setting a cross angle based on a plate width of the rolling material S, so that the cross angle can be easily changed.
Moreover, the shaft-end supporting members 16a and 17a are exchangeable with respect to each other with the shaft-ends of the first wiper rolls 12a and 21a and the second wiper rolls 14a and 22a, and the shaft-end supporting members 16b and 17b are exchangeable with respect to each other with the shaft-ends of the first wiper rolls 12b and 21b and the second wiper rolls 14b and 22b. With this, in a case where a cycle of exchanging wiper rolls defers depending on first wiper rolls or second wiper rolls, only one set of standby rolls is needed. In addition, the maintenanceability can be improved even in a normal time.
Industrial Applicability
The present invention is applicable to a rolling mill provided with a wiper device.
18

WE CLAIM:
1. A rolling mill provided with working rolls formed of a pair of upper and
lower rolls for rolling a rolling material, a coolant device for supplying a
coolant for cooling and lubricating the rolling material and the working rolls,
and a wiper device for removing the coolant adhered to the rolling material,
the rolling mill characterized in that the wiper device comprises, in the order
from an upstream of a rolling direction:
first wiper rolls which wipe the rolling material and are formed of a pair of
upper and lower crowning-processed hollow rolls;
a shielding portion for preventing the coolant from dispersing and readhering
onto the rolling material;
second wiper rolls which wipe the rolling material and are formed of a pair of
upper and lower crowning-processed hollow rolls; and
an air spraying device for spraying air from a downstream-side position of the
rolling direction to a vicinity of ends of the rolling material wiped by the
second wiper rolls.
2. The rolling mill according to claim 1, characterized by further comprising:
shaft-end supporting members for supporting each of shaft-ends of the first
wiper rolls and the second wiper rolls; and
a structure supporting member for supporting the shaft-end supporting members so as to be movable in upper and lower directions.
3. The rolling mill according to claim 2, characterized in that the first wiper rolls and the second wiper rolls are flat rolls, and are arranged in such a manner that upper and lower roll shafts are crossed with each other in the plate width direction and the first wiper rolls and the second wiper rolls are arranged so as to be crossed in a same direction.
4. The rolling mill according to claim 3, characterized in that the first wiper rolls and the second wiper rolls are arranged so as to be crossed in the directions opposite to each other.
5. The rolling mill according to any one of claims 3 and 4, characterized by comprising a cross angle setting mechanism for setting a cross angle on the basis of the plate width of the rolling material.
6. The rolling mill according to claim 2, characterized in that the first wiper rolls
19

to which the shaft-end supporting members are attached and the second wiper rolls to which the shaft-end supporting members are attached are arranged in mutually exchangeable.
7. A rolling method for supplying a coolant for cooling and lubrication during rolling and thereafter removing the coolant adhered to a rolling material, the rolling method characterized by wiping the rolling material by first wiper rolls which are formed of a pair of upper and lower crowning-processed hollow rolls; preventing the coolant from dispersing and readhering onto the rolling material; further wiping the rolling material by second wiper rolls which are formed of a pair of upper and lower crowning-processed hollow rolls; and spraying air from a downstream-side position of the rolling direction to remove the coolant discharged from a vicinity of ends of the rolling material wiped by the second wiper rolls.
8. The rolling method according to claim 7, characterized in that the first wiper rolls and the second wiper rolls are flat-processed and are arranged in such a manner that upper and lower roll shafts are crossed with each other in the plate width direction.
9. The rolling method according to any one of claims 7 and 8, characterized in that at least one of a crowning process and cross-arrangement is applied to the second wiper rolls.
Dated this 30th day of August, 2007


.

20

ABSTRACT
It is an object of the present invention to provide a rolling mill in which pressing force in a plate width direction of a rolling material is made uniform to prevent deformation and wiping can be evenly performed in the plate width direction, and a rolling method. Accordingly, the present invention is formed in such a manner that a rolling material (S) is wiped by first wiper rolls (12a, 12b) formed of a pair of upper and lower crowning-processed hollow rolls, a coolant (C)is prevented from dispersing and readhering onto the rolling material (S), the rolling material (S) is further wiped by second wiper rolls (14a, 14b) formed of a pair of upper and lower crowning-processed hollow rolls, and air is sprayed from a downstream of the rolling direction to remove the coolant (C) discharged from a vicinity of ends of the rolling material(S) wiped by the second wiper rolls (14a, 14b).
To,
The Controller of Patents,
The Patent Office,
Mumbai


Documents:

1350-mumnp-2007-abstract.doc

1350-mumnp-2007-abstract.pdf

1350-MUMNP-2007-CANCELLED PAGES(25-11-2010).pdf

1350-MUMNP-2007-CLAIMS(AMENDED)-(25-11-2010).pdf

1350-MUMNP-2007-CLAIMS(GRANTED)-(29-9-2011).pdf

1350-mumnp-2007-claims.doc

1350-mumnp-2007-claims.pdf

1350-mumnp-2007-correspondence(11-9-2007).pdf

1350-MUMNP-2007-CORRESPONDENCE(2-11-2007).pdf

1350-mumnp-2007-correspondence(21-11-2007).pdf

1350-MUMNP-2007-CORRESPONDENCE(25-11-2010).pdf

1350-MUMNP-2007-CORRESPONDENCE(IPO)-(30-9-2011).pdf

1350-mumnp-2007-correspondence-others.pdf

1350-mumnp-2007-correspondence-received.pdf

1350-mumnp-2007-description (complete).pdf

1350-MUMNP-2007-DESCRIPTION(GRANTED)-(29-9-2011).pdf

1350-MUMNP-2007-DRAWING(25-11-2010).pdf

1350-MUMNP-2007-DRAWING(6-9-2007).pdf

1350-MUMNP-2007-DRAWING(GRANTED)-(29-9-2011).pdf

1350-mumnp-2007-drawings.pdf

1350-MUMNP-2007-FORM 1(21-11-2007).pdf

1350-MUMNP-2007-FORM 1(25-11-2010).pdf

1350-mumnp-2007-form 13(11-9-2007).pdf

1350-MUMNP-2007-FORM 13(25-11-2010).pdf

1350-MUMNP-2007-FORM 18(25-11-2010).pdf

1350-MUMNP-2007-FORM 2(GRANTED)-(29-9-2011).pdf

1350-MUMNP-2007-FORM 2(TITLE PAGE)-(25-11-2010).pdf

1350-MUMNP-2007-FORM 2(TITLE PAGE)-(6-9-2007).pdf

1350-MUMNP-2007-FORM 2(TITLE PAGE)-(GRANTED)-(29-9-2011).pdf

1350-MUMNP-2007-FORM 3(25-11-2010).pdf

1350-MUMNP-2007-FORM 5(25-11-2010).pdf

1350-MUMNP-2007-FORM PCT-IB-373(25-11-2010).pdf

1350-mumnp-2007-form pct-isa-210(21-11-2007).pdf

1350-MUMNP-2007-FORM PCT-ISA-237(25-11-2010).pdf

1350-mumnp-2007-form-1.pdf

1350-mumnp-2007-form-18.pdf

1350-mumnp-2007-form-2.doc

1350-mumnp-2007-form-2.pdf

1350-mumnp-2007-form-3.pdf

1350-mumnp-2007-form-5.pdf

1350-mumnp-2007-form-pct-ib-311.pdf

1350-MUMNP-2007-PETITION UNDER RULE 137(25-11-2010).pdf

1350-MUMNP-2007-POWER OF ATTORNEY(6-9-2007).pdf

1350-MUMNP-2007-REPLY TO EXAMINATION REPORT(25-11-2010).pdf

abstract1.jpg


Patent Number 249092
Indian Patent Application Number 1350/MUMNP/2007
PG Journal Number 39/2011
Publication Date 30-Sep-2011
Grant Date 29-Sep-2011
Date of Filing 06-Sep-2007
Name of Patentee MITSUBISHI-HITACHI METALS MACHINERY INC
Applicant Address 10-1, SHIBA 4-HOME, MINATO-KU, TOKYO 1080014,
Inventors:
# Inventor's Name Inventor's Address
1 TAKEHIKO SAITO C/O MITSUBISHI-HITACHI METALS MACHINERY,INC. HIROSHIMA WORKS, 6-22, KAN-ON-SHIN-MACHI 4-CHOME, NISHI-KU, HIROSHIMA-SHI, HIROSHIMA 7338553
2 GORO FUKUYAMA C/O MITSUBISHI-HITACHI METALS MACHINERY INC. HIROSHIMA WORKS, 6-22, KAN-ON-SHIN-MACHI 4-CHOME, NISHI-KU, HIROSHIMA-SHI, HIROSHIMA 7338553
3 YUKIO HIRAMA C/O MITSUBISHI-HITACHI METALS MACHINERY INC. HIROSHIMA WORKS, 6-22, KAN-ON-SHIN-MACHI 4-CHOME, NISHI-KU, HIROSHIMA-SHI, HIROSHIMA 7338553
4 MICHIMASA TAKAGI C/O MITSUBISHI-HITACHI METALS MACHINERY INC. HIROSHIMA WORKS, 6-22, KAN-ON-SHIN-MACHI 4-CHOME, NISHI-KU, HIROSHIMA-SHI, HIROSHIMA 7338553
5 TAKASHI NORIKURA C/O MITSUBISHI-HITACHI METALS MACHINERY INC 10-1, SHIBA 4- CHOME, MINATO-KU, TOKYO 1080014
6 TETSUO KAJIHARA C/O.HIROSHIMA RESEARCH & DEVELOPMENT CENTER MITSUBISHI HEAVY INDUSTRIES LTD. 6-22, KAN-ON-SHIN-MACHI 4-CHOME, NISHI-KU, HIROSHIMA-SHI, HIROSHIMA 7338553
7 HIROTOSHI TAGATA C/O.HIROSHIMA RESEARCH & DEVELOPMENT CENTER MITSUBISHI HEAVY INDUSTRIES,LTD. 6-22, KAN-ON-SHIN-MACHI 4-CHOME, NISHI-KU, HIROSHIMA-SHI, HIROSHIMA 7338553
PCT International Classification Number B21B27/10
PCT International Application Number PCT/JP06/304758
PCT International Filing date 2006-03-10
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 2005-114128 2005-04-12 Japan