JP2004314174A - Cross-roll rolling mill and rolling method using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cross-roll rolling mill which has a simple structure, the installation cost of which is low, the reliability of which is high and with which the deviation of a position within the clearance of each roll chock is prevented. <P>SOLUTION: Rolling is performed while work rolls 1 are energized in the direction of offset with springs 21 during rolling or/and rolling is performed while back-up rolls 2 are energized in the offset direction with springs 25 during rolling when rolling a material to be rolled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cross-roll rolling mill and a rolling method using the same.

  The cross-roll rolling machine is characterized in that the material to be rolled is rolled while the upper and lower work rolls are crossed. FIGS. 12A and 12B show the positional relationship between the upper and lower work rolls and the material to be rolled. FIG. 12A is a plan view, and FIG. 12B is a side view. As shown in FIG. 12A, the upper and lower work rolls 101 are arranged so as to cross at a predetermined cross angle θ (variable) with a center in the width direction of the material S to be rolled as a cross center (cross point) c. . As a result, as shown in FIG. 12B, a difference occurs between the opening degree a of the upper and lower work rolls 101 near the cross point c and the opening degree b of the upper and lower work rolls 101 near the roll end. The distribution of the degree of opening of the roll 101 in the width direction of the material S to be rolled is a quadratic curve as shown in FIG. The larger the cross angle θ, the steeper the slope below the quadratic curve, and the smaller the cross angle θ, the gentler the slope below the quadratic curve. If the cross angle θ is 0, the opening degree of the upper and lower work rolls becomes constant.

  In the rolling mill before the appearance of the cross roll rolling mill, the thickness distribution of the material S to be rolled has a width due to the bending of the upper and lower work rolls 101 and the upper and lower backup rolls 102 due to the rolling load during rolling as shown in FIG. It tended to be thicker at the center and thinner at the width end. However, in the cross roll rolling mill, the above-mentioned cross angle θ is optimally set, and the opening degree of the upper and lower work rolls 101 is set to an optimal quadratic curve. As shown in FIG. 14 (b), it is possible to make the widthwise thickness distribution of the material S to be rolled closer to a uniform one after rolling, thereby improving the thickness accuracy. For this reason, in recent years, many cross-roll rolling mills have been installed regardless of hot rolling or cold rolling.

  FIG. 15 shows an outline of a main part of the cross roll rolling mill. The side on which the motor for driving the upper and lower work rolls 101 is disposed is referred to as a drive side, and the opposite side operated by the operator is referred to as an operator side. The rotation axis of the upper work roll 101 is rotatably supported by a pair of upper work roll chock 103 on the drive side and the operator side. The rotation axis of the lower work roll 101 is rotatably supported by a pair of lower work roll chocks 104 on the drive side and the operator side. The rotation axis of the upper backup roll 102 disposed above the upper work roll 101 is rotatably supported by a pair of upper backup roll chock 105 on the drive side and the operator side. The rotation axis of the lower backup roll 102 disposed below the lower work roll 101 is rotatably supported by a pair of lower backup roll chock 106 on the drive side and the operator side.

  In this cross roll rolling mill, unlike the previous rolling mill, a cross head arranged so as to hold the upper and lower backup roll chocks 105 and 106 and the upper and lower work roll chocks 103 and 104 in the conveying direction of the material S to be rolled and in the opposite direction. The upper work roll 101, the upper backup roll 102, the lower work roll 101 and the upper work roll 101 are driven by driving the crossheads 107 and 108 in the conveying direction of the material S to be rolled as indicated by the large arrows in FIG. The lower backup roll 102 is driven as a set to set the above-mentioned cross angle θ.

As shown in FIG. 15, a method in which the upper work roll 101 and the upper backup roll 102 and the lower work roll 101 and the lower backup roll 102 are driven as a set is called a pair cross method, and a method in which only the upper and lower work rolls 101 are driven is called a work. It is called a roll-only cross system.
In addition, a cross head is disposed on one of the drive side and the operator side, the side on which the cross head is disposed is crossed, and the opposite side is pivoted by a single cross method (a cross head is provided on the upper roll drive side. Sometimes there is a crosshead on the operator side of the lower roll). The cross-roll rolling mill shown in FIG. 15 illustrates the one corresponding thereto, in which the upper work roll chock 103 and the upper backup roll chock 105 arranged on the drive side of the upper work roll 101 and the upper backup roll 102 include: A crosshead 107 is arranged in a manner to be held in the conveying direction of the material to be rolled S and the opposite direction, and the lower work roll chock 104 and the lower backup roll chock 106 arranged on the operator side of the lower work roll 101 and the lower backup roll 102 are covered. The crosshead 108 is arranged so as to hold the rolled material S in the conveying direction and the opposite direction. Conversely, crossheads may be arranged on the operator side of the upper work roll and the upper backup roll and on the drive side of the lower work roll and the lower backup roll. A method in which the crossheads are arranged on both the drive side and the operator side on both the upper and lower sides, the two crossheads are crossed, and no pivot is provided is referred to as a double cross method. Hereinafter, the case of a pair cross method and a single cross method will be described, but as a basic function, the work roll single cross method and the two cross methods are the same, so the cross roll rolling mill referred to in the present invention is The meaning is included.

  FIGS. 16 (a) and 16 (b) schematically show the cross roll rolling mill of FIG. 15 as viewed from the operator side. This cross roll rolling mill is of a pair cross type and a single cross type. In this cross roll rolling mill, the upper work roll chock 103 and the upper backup roll chock 105 arranged on the drive side of the upper work roll 101 and the upper backup roll 102 are held in the form of being held in the conveying direction of the material S to be rolled and the opposite direction. A pair of crossheads (not shown) are arranged. A pair of crossheads 108 are arranged so as to hold the lower work roll chock 104 and the lower backup roll chock 106 arranged on the operator side of the lower work roll 101 and the lower backup roll 102 in the conveying direction of the material S to be rolled and in the opposite direction. Have been.

  Here, each crosshead 108 is supported movably in the transport direction of the material to be rolled with respect to the rolling mill housing 100. Each crosshead 108 is driven by a screw 115 screwed to a nut 116 fixed to the rolling mill housing 100. As shown in FIG. 16B, a curved surface T is formed at a constant curvature in a horizontal direction (up and down direction in FIG. 16B) at an opposing portion of each cross head 108 on the lower work roll chock 104 side. I have. Each lower crosshead liner 113 has a curved surface T corresponding thereto. The curved surface T is in contact with the crosshead 108 so as to roll freely in the horizontal direction. On the other hand, the lower crosshead liner 113 is in contact with the choc liner 117 provided on the lower work roll chock 104 at a plane portion. Further, a curved surface similar to the above-described T that bends at a constant curvature in the horizontal direction is also formed in the opposed portion on the lower backup roll chock 106 side of each cross head 108. Each lower crosshead liner 114 on which the corresponding curved surface T is formed abuts on a choke liner (not shown) provided on the lower backup roll chock 106 at a flat portion, while the other curved surface T has a crosshead. The roller 108 is in contact with the roller 108 so as to roll freely in the horizontal direction. The cross angle θ can be changed by sliding the crossheads 108 and the crosshead liners 113 and 114 between sliding surfaces forming a curved surface T. Each of the crossheads arranged to hold the upper work roll chock 103 and the upper backup roll chock 105 arranged on the drive side of the upper work roll 101 and the upper backup roll 102 in the conveying direction of the material S to be rolled and in the opposite direction. , Having a structure similar to that of the crosshead 108, a curved surface T is formed on a surface facing the upper work roll chock 103 and the upper backup roll chock 105, and a crosshead liner having a curved surface on each of the curved surfaces T. (Not shown) is provided.

  On the other hand, a pair of upper work roll pivot blocks 109 is provided in the rolling mill housing 100 so as to face the upper work roll chock 103 arranged on the operator side of the upper work roll 101. A curved surface T is formed at a constant curvature in the horizontal direction at a portion facing each upper work roll pivot block 109 on the upper work roll chock 103 side, and each upper work roll pivot block formed with the corresponding curved surface T is formed. The liner 110 abuts on a flat portion of a choc liner (not shown) provided on the upper work roll chock 103, while the other curved surface T abuts on the upper work roll pivot block 111 so as to freely roll in the horizontal direction. I have. Further, a pair of upper backup roll pivot blocks 111 is provided in the rolling mill housing 100 so as to face the upper backup roll chock 105 arranged on the operator side of the upper backup roll 102. A curved surface T is formed at a constant curvature in the horizontal direction at a portion facing each upper backup roll pivot block 111 on the side of the upper backup roll chock 105, and each upper backup roll pivot block formed with the corresponding curved surface T. The liner 112 is in contact with the upper backup roll chock 105 at a flat portion, while the other curved surface T is in contact with the upper backup roll pivot block 111 so as to freely roll in the horizontal direction. Also, on the drive side of the lower work roll 101 and the lower backup roll 102, a lower work roll pivot block, a lower work roll pivot block liner, a lower backup roll pivot block, and a lower backup roll pivot block liner are provided.

  In general, during rolling of the material to be rolled S by the rolling mill, the work roll 101 is shifted in the transport direction of the material to be rolled S with respect to the backup roll 102 in both upper and lower directions, as described in Patent Document 1. This is called an offset, and in FIG. 16A, the offset amount of the work roll with respect to the center of the rolling mill is C1, and the offset amount of the backup roll is C2. Generally, the sum of C1 and C2 is referred to as an offset amount. Due to the offset, a horizontal component force (also referred to as an offset component force) is generated in the direction of arrow e in FIG. The direction of arrow e corresponds to the direction in which the work roll is offset. A horizontal component force is generated in the upper and lower backup rolls 102 in a direction indicated by an arrow f opposite to the transport direction of the material S to be rolled. The direction of arrow f coincides with the direction in which the backup roll is offset. Then, the upper and lower work roll chocks 103 and 104 are pushed in the conveying direction of the material S to be rolled, and the upper and lower backup roll chocks 105 and 106 are pushed in the opposite direction. The upper and lower backup roll chocks 105, 106 are pressed against the rolling mill housing 100, and are pressed against the rolling mill housing 100 on the entry side in the transport direction of the material S to be rolled, and are stabilized.

  However, as shown in FIGS. 16 (a) and 16 (b), between each of the roll chocks 103, 104, 105 and 106 and the rolling mill housing 100 (exactly, a choke liner provided on the upper work roll chock 103). And the work roll pivot block liner 110, between the choc liner 117 provided on the lower work roll chock 104 and the crosshead liner 113, between the upper backup roll chock 105 and the backup roll pivot block liner 112, and the lower backup roll chock. 106 and the crosshead liner 114), there is a clearance d, and if the roll chocks 103, 104, 105, and 106 are not positioned in the transport direction of the material S to be rolled, the rolling load is small, that is, offset. Pressed by During rolling with a small force, when the cross angle θ is changed, the upper and lower work roll chocks 103 and 104 or the upper and lower backup roll chocks 105 and 106 in the rolling mill housing 100 move in the transport direction of the material S to be rolled or vice versa. If the position shift occurs in the left and right direction (the drive side and the operator side opposite to the drive side), the difference between the opening degrees of the upper and lower work rolls 101 occurs in the left and right directions in the width direction of the material S to be rolled. If the material S to be rolled meanders, bends or is severe, there is a problem that the material S is broken.

In order to prevent this, for example, a device that presses a bearing box (chock) with a hydraulic cylinder in a conveying direction of a material to be rolled, as in Patent Document 2 or Patent Document 3, or a device in which rolling load is applied as in Patent Document 4 A method has been proposed in which the amount of shrinkage of the rolling mill housing is predicted to minimize the distance between the chock and the rolling mill housing.
Here, the housing shrinkage means, as shown in FIG. 17 (b), the rolling direction of the material to be rolled generated at the center in the vertical direction of the housing due to the rolling load acting in the vertical direction of the rolling mill housing during rolling. , That is, shrinkage of the distance between the entrance side and the exit side of the housing.
JP-A-8-197110 JP-A-9-285806 JP 2001-113308 A JP-A-7-32018

However, in the method of pressing the chocks toward the rolling mill housing by the hydraulic cylinder as described in Patent Documents 2 and 3 described above, it is necessary to install the hydraulic cylinder in a very narrow place. As a result, there was a problem that the installation cost was high. This problem is particularly remarkable when an existing rolling mill is modified.
In addition, the pipe for supplying the hydraulic pressure to the hydraulic cylinder must pass through a space that does not hinder the transport of the material to be rolled and that does not have a rolling mill housing or a chock. Space for installing piping support is also required. In combination with the special cylinder structure of the hydraulic cylinder described above, problems such as oil leakage are likely to occur, and there are problems of reliability and costs of repair and maintenance. In addition, there was a problem that the operation rate of the equipment was lowered to secure the repair time.

  Usually, a large amount of roll cooling water, chock cooling water, and the like exist around the hot rolling mill. It is desirable to arrange a lubricant supply port at a sliding portion between the chock and the housing or between the chock and the hydraulic cylinder so that the lubricant is not caused to flow by the cooling water. However, arranging the lubricant supply port in the sliding portion between the chock and the hydraulic cylinder cannot be realized because the lubricant supply hole must be penetrated in the hydraulic cylinder. Further, when a chock is pressed by the hydraulic cylinder, the sliding pressure increases, and the amount of wear on the chock liner and the cylinder surface increases, so that the cost for repair increases.

Further, as described in Patent Document 4 described above, in the method of estimating the shrinkage amount of the rolling mill housing due to the rolling load and minimizing the distance between the chocks and the rolling mill housing, when the rolling load is small, If the amount is small, the space between the chocks and the rolling mill housing may remain, and the chocks may not be completely stabilized. Also, if the distance between the chocks and the rolling mill housing is set too small, the chocks will be pinched by the housing, which may result in equipment trouble such as roll non-rotation and bearing burnout. Was.
Accordingly, the present invention has been made in view of the above-described problems, and has as its object to prevent a displacement of the roll chock in the clearance between the roll chocks with high reliability while having a simple structure and a low installation cost. An object of the present invention is to provide a cross roll rolling mill and a rolling method using the same.

1. A cross-roll rolling mill according to the present invention is a cross-roll rolling mill including a work roll chock rotatably supporting a work roll and a backup roll chock rotatably supporting a backup roll. A spring for biasing the work roll chock is provided in a direction in which the work roll chock is offset.
2. The cross roll rolling mill according to the present invention comprises: In the invention described in (1), a spring for biasing the backup roll chock is further provided in a direction in which the backup roll is offset while rolling the material to be rolled.

3. The cross roll rolling mill according to the present invention comprises: And 2. In the invention described in above, a lubricant is supplied between the spring holder and the choc liner and between the crosshead and the crosshead liner.
4. A rolling method using a cross roll rolling mill according to the present invention is a rolling method using a cross roll rolling mill including a work roll chock rotatably supporting a work roll and a backup roll chock rotatably supporting a backup roll, When rolling the material to be rolled, the work roll chock is rolled while being urged by a spring in a direction in which the work roll is offset during rolling.

5. 3. The rolling method using the cross roll rolling mill according to the present invention is described in In the invention described in the above, when rolling the material to be rolled, the backup roll chock is rolled while being urged by a spring in a direction in which the backup roll is offset during rolling.
6. 3. The rolling method using the cross roll rolling mill according to the present invention is described in And 5. In the invention described in above, a lubricant is supplied between the spring holder and the choc liner and between the crosshead and the crosshead liner.

According to the cross-roll rolling mill and the rolling method using the cross-roll rolling mill according to the present invention, the work roll chock is urged in the roll offset direction by a simple means of a spring, so that the work roll chock is within the clearance of the work roll chock. Displacement can be prevented, and troubles such as meandering, bending, and breakage of the material to be rolled can be prevented.
Further, in addition to the work roll chock, the backup roll chock is further urged in the roll offset direction by a simple means such as a spring, thereby preventing the displacement of each roll chock within the clearance, and the cross angle between the work roll and the backup roll. The occurrence of (roll cross angle) is suppressed as much as possible, and the accompanying generation of thrust force is suppressed as much as possible, so that troubles such as meandering, bending, and breakage of the material to be rolled can be more effectively prevented.

  Also, by using a spring as a means for biasing the work roll chock or further the backup roll, it is possible to avoid the difficulty of installing a hydraulic cylinder or hydraulic piping in a narrow space that does not interfere with the rolling mill housing and each roll chock. Therefore, the device is inexpensive and highly reliable. Further, by supplying the lubricant directly to the sliding portion between the spring holder and the chock liner, it is possible to maintain a good lubrication state without the lubricant flowing by the cooling water such as the roll cooling water and the chock cooling water. In addition, the cost for repair maintenance of liners can be reduced.

Next, an embodiment of the present invention will be described with reference to the drawings. 1 (a) and 1 (b) show a first embodiment of a cross roll rolling mill according to the present invention, and FIG. 1 (a) is a schematic view of the cross roll rolling mill viewed from an operator side, and FIG. FIG. 2B is a view as seen from the direction of arrows AA in FIG.
In the cross roll rolling mill shown in FIG. 1A, the lower roll will first be described. The lower work roll chock rotatably supports the lower work roll 1 disposed on the operator side of the lower work roll 1 and the lower backup roll 2. A pair of crossheads 8 are arranged so as to hold the lower backup roll chock 6 that rotatably supports the lower backup roll 4 and the lower backup roll 2 in the conveying direction of the material to be rolled and in the opposite direction.

  Here, each crosshead 8 is supported movably in the transport direction of the material to be rolled with respect to the rolling mill housing 30. Each crosshead 8 is driven by a screw 15 screwed to a nut 16 fixed to a rolling mill housing 30. As shown in FIG. 1B, a curved surface T is formed at a constant curvature in the horizontal direction (vertical direction in FIG. 1B) at the facing portion on the lower work roll chock 4 side of each cross head 8. Each of the lower cross head liners 13 having the corresponding curved surface T abuts on the flat portion of the chock liner 17 provided on the lower work roll chock 4 while the other curved surface T is crossed. It is in contact with the head 8 so that it can roll freely in the horizontal direction. In addition, a curved surface similar to the above-described T that bends at a constant curvature in the horizontal direction is also formed in the opposed portion on the lower backup roll chock 6 side of each crosshead 8, and a corresponding curved surface T is formed. Each lower crosshead liner 14 abuts on a choke liner (not shown) provided on the lower backup roll chock 6 in a flat portion, while the other curved surface T abuts on the crosshead 8 so as to freely roll in the horizontal direction. ing. Each of the crossheads 8 and the crosshead liners 13 and 14 slide on each other on curved sliding surfaces, so that the cross angle can be changed.

  In the state shown in FIG. 1A, the lower work roll chock 4 is moved by the crosshead liner 13 in the transport direction of the material to be rolled (the same direction as the horizontal component force e), and the lower backup roll chock 6 is moved by the crosshead liner 14. It is positioned in a state where it is offset in the direction opposite to the transport direction of the material to be rolled (the same direction as the horizontal component force f). In order to prevent the lower work roll chock 4 from being displaced, the lower work roll chock 4 is provided on the crosshead liner 13 on the entry side in the transport direction of the material to be rolled toward the rolling mill housing 30 (the exit side in the transport direction of the material to be rolled). A biasing chock restraining device 18 is provided. In other words, the crosshead liner 13 on the entry side in the conveying direction of the material to be rolled is provided with the choke restraining device 18 for urging the lower work roll chock 4 in the direction in which the lower work roll 1 is offset while rolling the material to be rolled. Have been.

  As shown in FIG. 1B, the choc restraining device 18 includes a crosshead liner 13, a thin liner 20, a spring 21, and a spring holder 19. The spring 21 presses the spring holder 19 against the chock liner 17, thereby biasing the lower work roll chock 4 toward the rolling mill housing 30. As the spring 21, a disc spring is preferable. It is applicable as long as it has an elastic body or a function equivalent thereto, and is not limited to a disc spring.

Although not shown, the crosshead liner 13 and the spring holder 19 are provided with a through-hole for lubrication, and the lubricant supplied between the crosshead and the crosshead liner passes through the through-hole to allow the spring holder 19 and the chock liner to pass through. And is supplied to the sliding surface.
On the other hand, FIG. 1A shows the operator side, whereas the drive side, which is not shown, has a lower work roll pivot block liner (not shown) on the side of the material to be fed in the transport direction. A chock restraining device (not shown) that urges a lower work roll chock (not shown) toward the rolling mill housing 30 (the side of the material to be rolled in the conveying direction) is provided. This chock restraining device has the same configuration as the chock restraining device 18 on the operator side.

  Next, the upper roll will be described. A pair of upper work roll pivot blocks 9 is provided so as to face the upper work roll chock 3 that rotatably supports the upper work roll 1 disposed on the operator side of the upper work roll 1. The rolling mill housing 30 is provided. Each upper work roll pivot block 9 has a curved surface T that is curved at a constant curvature in the opposite portion of the upper work roll chock 3 side, and each upper work roll on which the corresponding curved surface T is formed. The pivot block liner 10 comes into contact with a choc liner (not shown) provided on the upper work roll chock 3 at a flat portion, while the other curved surface T comes into contact with the upper work roll pivot block 9 so as to roll freely in the horizontal direction. In contact.

  A pair of upper backup roll pivot blocks 11 is provided in the rolling mill housing 30 so as to face the upper backup roll chock 5 rotatably supporting the upper backup roll 2 disposed on the operator side of the upper backup roll 2. ing. A curved surface T which is curved at a constant curvature in the horizontal direction is formed in a portion of each upper backup roll pivot block 11 facing the upper backup roll chock 5, and each upper backup roll on which the corresponding curved surface T is formed. The pivot block liner 12 is in contact with the upper backup roll chock 5 at a flat portion, while the other curved surface is supported so as to freely roll in the horizontal direction with the upper backup roll pivot block 11.

  In the state shown in FIG. 1A, the upper work roll chock 3 is moved in the conveying direction of the material to be rolled by the upper work roll pivot block liner 10, and the upper backup roll chock 5 is moved in the conveying direction of the material to be rolled by the upper backup roll pivot block liner 12. Is positioned in a state where it is offset in the opposite direction to that of FIG. In order to prevent displacement, the upper work roll chock 3 is urged toward the rolling mill housing 30 (outgoing side in the transport direction of the material to be rolled) on the upper work roll pivot block liner 10 on the incoming side in the transport direction of the material to be rolled. A chock restraining device 18 is provided. In other words, the upper work roll pivot block liner 10 on the entry side in the transport direction of the material to be rolled has a choke restraining device for urging the upper work roll chock 3 in a direction in which the upper work roll 1 is offset while rolling the material to be rolled. 18 are installed. The upper work roll chock restraining device 18 has the same configuration as the choke restraining device 18 for urging the lower work roll chock 4. The upper work roll chock restraining device 18 includes the upper work roll pivot block liner 10, a thin liner (not shown), a spring (not shown), and a spring holder (not shown). A spring (not shown) presses a spring holder (not shown) against the chock liner, thereby urging the upper work roll chock 3 toward the rolling mill housing 30.

The upper work roll pivot block liner 10 and a spring holder (not shown) are provided with through holes for greasing, and lubricant supplied between the upper work roll pivot block 9 and the upper work roll pivot block liner 10 is supplied. Through this through hole, the oil is supplied to the surface of the spring holder, in other words, to the sliding surface between the spring holder and the chock liner.
On the other hand, FIG. 1A shows the operator side, while the drive side not shown can rotate the upper work roll 1 disposed on the drive side of the upper work roll 1 and the upper backup roll 2. The upper work roll chock (not shown) for supporting the upper work roll and the upper backup roll chock (not shown) for rotatably supporting the upper backup roll 2 are held in the conveying direction of the material to be rolled and the opposite direction. A head (not shown) is provided. A curved surface T that is curved at a constant curvature in the horizontal direction is formed in an opposing portion on the upper work roll chock side of each crosshead, and each upper crosshead liner on which the corresponding curved surface T is formed, While the flat part contacts the chock liner provided on the upper work roll chock, the other curved surface is in contact with the crosshead (not shown) so as to freely roll in the horizontal direction. In addition, a curved surface T that is curved at a constant curvature in the horizontal direction is also formed in the opposing portion of each crosshead on the upper backup roll chock side, and each upper crosshead liner on which the corresponding curved surface T is formed, While the flat portion abuts against a choc liner (not shown) provided on the upper backup roll chock, the other curved surface T is supported so as to roll freely in the horizontal direction with an upper backup roll crosshead (not shown). .

It is preferable to supply a lubricant to the curved surface T, and it is preferable to supply the lubricant by providing a through hole on the crosshead side.
Then, in order to prevent the displacement of the upper work roll chock, the upper work roll crosshead liner on the entry side in the transport direction of the material to be rolled is provided with the upper side facing the rolling mill housing 30 (the exit side in the transport direction of the material to be rolled). A chock restraining device (not shown) for urging the work roll chock is provided. In other words, the upper work roll crosshead liner on the entry side in the transport direction of the material to be rolled is provided with a chock restraining device for urging the upper work roll chock in a direction in which the upper work roll 1 is offset while rolling the material to be rolled. Have been. This chock restraining device has the same configuration as the chock restraining device 18 on the operator side.

  According to the first embodiment of the cross roll rolling mill described above, the upper and lower work roll chocks 3 and 4 on both the operator side and the drive side are connected to the roll offset direction (the upper and lower work roll chocks 3 and 4) by a simple means such as a spring 21. By biasing the work roll chocks 3 and 4 in the clearance with respect to the upper work roll pivot block liner 10 and the crosshead liner 13 in the clearance in the conveying direction of the material to be rolled, the meandering of the material to be rolled, Problems such as bending and breakage can be prevented.

Next, a second embodiment of the cross roll rolling mill according to the present invention will be described with reference to FIGS. 2 (a) and 2 (b). FIG. 2A shows a second embodiment of the cross roll rolling mill according to the present invention, FIG. 2A is a schematic view of the cross roll rolling mill viewed from the operator side, and FIG. It is a BB arrow line view in a).
The cross roll rolling mill shown in FIG. 2 (a) further includes a choke restraining device 22 for urging the upper and lower backup roll chocks 5, 6 in a direction in which the upper and lower backup rolls 2 are offset during rolling of the material to be rolled. This is different from the cross roll rolling mill shown in FIG. Hereinafter, this will be described in detail.

  In the cross roll rolling mill shown in FIG. 2A, the lower roll will be described first. The lower work roll chock rotatably supports the lower work roll 1 disposed on the operator side of the lower work roll 1 and the lower backup roll 2. A pair of crossheads 8 are arranged so as to hold the lower backup roll chock 6 that rotatably supports the lower backup roll 4 and the lower backup roll 2 in the conveying direction of the material to be rolled and in the opposite direction.

  Here, each crosshead 8 is supported movably in the transport direction of the material to be rolled with respect to the rolling mill housing 30. Each crosshead 8 is driven by a screw 15 screwed to a nut 16 fixed to a rolling mill housing 30. A curved surface T having a constant curvature in the horizontal direction is formed in the facing portion of each crosshead 8 on the lower work roll chock 4 side, and each lower crosshead liner 13 having the corresponding curved surface T is formed. The flat surface portion abuts against the choc liner 17 provided on the lower work roll chock 4, while the other curved surface T abuts on the crosshead 8 so as to freely roll in the horizontal direction. Also, a curved surface T having a constant curvature in the horizontal direction is formed on the opposite portion of each crosshead 8 on the side of the lower backup roll chock 6, and each lower crosshead liner 13 having the curved surface T corresponding thereto is formed. While the lower backup roll chock 6 is in contact with the flat portion at the flat portion, the other curved surface T is supported on the cross head 8 so as to freely roll in the horizontal direction. Each of the crossheads 8 and the crosshead liners 13 and 14 slide against each other on curved sliding surfaces to change the cross angle.

  In the state shown in FIG. 2A, the lower work roll chock 4 is moved by the crosshead liner 13 in the conveying direction of the material to be rolled (the same direction as the horizontal component e), and the lower backup roll chock 6 is moved by the crosshead liner 14. It is positioned in a state where it is offset in the direction opposite to the transport direction of the material to be rolled (the same direction as the horizontal component force f). In order to prevent the lower work roll chock 4 from being displaced, the lower work roll chock 4 is provided on the crosshead liner 13 on the entry side in the transport direction of the material to be rolled toward the rolling mill housing 30 (the exit side in the transport direction of the material to be rolled). A biasing chock restraining device 18 is provided. In other words, the crosshead liner 13 on the entry side in the conveying direction of the material to be rolled is provided with the choke restraining device 18 for urging the lower work roll chock 4 in the direction in which the lower work roll 1 is offset while rolling the material to be rolled. Have been. This chock restraining device 18 has a configuration similar to that shown in FIG. 1B, and includes a crosshead liner 13, a thin liner 20, a spring 21, and a spring holder 19. The spring 21 presses the spring holder 19 against the chock liner 17, thereby biasing the lower work roll chock 4 toward the rolling mill housing 30.

Although not shown, the crosshead liner 13 and the spring holder 19 are provided with a through hole for lubrication, and the lubricant supplied between the crosshead and the crosshead liner passes through the through hole and the surface of the spring holder 19, in other words, For example, it is supplied to the sliding surface between the spring holder and the chock liner 17.
Further, in order to prevent the lower backup roll chock 6 from being displaced, the cross head liner 14 on the exit side in the transport direction of the material to be rolled is provided with the lower backup toward the rolling mill housing 30 (the entrance side in the transport direction of the material to be rolled). A chock restraining device 22 for urging the roll chock 6 is provided. In other words, the crosshead liner 14 on the exit side in the transport direction of the material to be rolled is provided with the choke restraining device 22 for urging the lower backup roll chock 6 in the direction in which the lower backup roll 2 is offset while rolling the material to be rolled. Have been. As shown in FIG. 2B, the choc restraining device 22 includes a crosshead liner 14, a thin liner 24, a spring 25, and a spring holder 23. The spring 25 presses the spring holder 23 against the chock liner 26, thereby urging the lower backup roll chock 6 toward the rolling mill housing 30.

Although not shown, the crosshead liner 14 and the spring holder 23 are provided with a through-hole for lubrication, and the lubricant supplied between the crosshead and the crosshead liner passes through the through-hole and the surface of the spring holder 23, In other words, it is supplied to the sliding surface between the spring holder and the choc liner 26.
FIG. 2A shows the operator side, while the drive side (not shown) is provided with a rolling mill on the lower work roll pivot block liner (not shown) on the side of the conveying direction of the material to be rolled. A chock restraining device (not shown) for urging the lower work roll chock (not shown) toward the housing 30 (the side of the material to be rolled in the conveying direction) is provided. This chock restraining device has the same configuration as the chock restraining device 18 on the operator side. A lower backup roll chock (not shown) is provided on the lower backup roll pivot block liner (not shown) on the exit side in the transport direction of the material to be rolled toward the rolling mill housing 30 (the entrance side in the transport direction of the material to be rolled). A choke restraining device (not shown) for urging the device is provided. This chock restraining device has the same configuration as the chock restraining device 22 on the operator side.

  Next, the upper roll will be described. A pair of upper work roll pivot blocks 9 are provided in the rolling mill housing 30 so as to face the upper work roll chock 3 that rotatably supports the upper work roll 1. In each of the upper work roll pivot blocks 9, a curved surface T is formed with a constant curvature in a horizontal direction at a portion facing the upper work roll chock 3, and each upper work roll pivot block having the corresponding curved surface T formed thereon. The liner abuts on a choke liner provided on the upper work roll chock 3 at a flat portion, while the other curved surface T abuts on the upper work roll pivot block 9 so as to freely roll in the horizontal direction.

  A pair of upper backup roll pivot blocks 11 is provided in the rolling mill housing 30 so as to face the upper backup roll chock 5 that rotatably supports the upper backup roll 2. A curved surface T is formed at a constant curvature in the horizontal direction on a surface of each upper backup roll pivot block 11 facing the upper backup roll chock 5, and each upper backup roll pivot block liner 12 having the curved surface T is formed by: The upper curved portion T is in contact with the upper backup roll chock 5 at a flat portion, while the other curved surface T is supported on the upper backup roll pivot block 11 so as to freely roll in the horizontal direction.

  In the state shown in FIG. 2A, the upper work roll chock 3 is moved in the conveying direction of the material to be rolled by the upper work roll pivot block liner 10, and the upper backup roll chock 5 is moved in the conveying direction of the material to be rolled by the upper backup roll pivot block liner 12. Is positioned in a state where it is offset in the opposite direction to that of FIG. In order to prevent the displacement of the upper work roll chock 3, the upper work roll pivot block liner 10 on the incoming side in the transport direction of the material to be rolled is provided with the upper work toward the rolling mill housing 30 (outside in the transport direction of the material to be rolled). A chock restraining device 18 for urging the roll chock 3 is provided. In other words, the upper work roll pivot block liner 10 on the entry side in the transport direction of the material to be rolled has a choke restraining device for urging the upper work roll chock 3 in a direction in which the upper work roll 1 is offset while rolling the material to be rolled. 18 are installed. This chock restraining device 18 has the same configuration as the choc restraining device 18 for urging the lower work roll chock 4. The chock restraining device 18 includes the upper work roll pivot block liner 10, a thin liner (not shown), a spring, and a spring holder. A spring (not shown) presses a spring holder (not shown) against the chock liner, thereby urging the upper work roll chock 3 toward the rolling mill housing 30.

Although not shown, the upper work roll pivot block block liner 10 and the spring holder (not shown) are provided with through holes for greasing, and are supplied between the upper work roll pivot block 9 and the upper work roll pivot block liner 10. The lubricant is supplied to the surface of the spring holder, in other words, to the sliding surface between the spring holder and the chock liner, through the through hole.
In order to prevent the displacement of the upper backup roll chock 5, the upper backup roll pivot block liner 12 on the exit side in the transport direction of the material to be rolled is directed toward the rolling mill housing 30 (the entrance side in the transport direction of the material to be rolled). A chock restraining device 22 for urging the upper backup roll chock 5 is provided. In other words, the upper backup roll pivot block block liner 12 on the exit side in the transport direction of the material to be rolled has a choke restraining device for urging the upper backup roll chock 5 in a direction in which the upper backup roll 2 is offset while rolling the material to be rolled. 22 are installed. This chock restraining device 22 has the same configuration as that shown in FIG.

  2A shows the operator side, while the drive side (not shown) rotates the upper work roll chock (not shown) that rotatably supports the upper work roll 1 and the upper backup roll 2. A pair of crossheads (not shown) are arranged so as to hold the upper backup roll chock (not shown) that supports the rolled material in the conveying direction of the material to be rolled and in the opposite direction. Then, a curved surface T is formed at a constant curvature in the horizontal direction at an opposing portion on the upper work roll chock side of each crosshead, and the crosshead liner having the corresponding curved surface T is formed on the upper work roll chock. The other curved surface T is rotatably supported in a horizontal direction with a crosshead liner (not shown) while being in contact with the provided choc liner at a flat portion. In addition, a curved surface T that is curved at a constant curvature in the horizontal direction is also formed in the opposite portion of each crosshead on the side of the upper backup roll chock, and the crosshead liner in which the corresponding curved surface T is formed is an upper backup liner. While the roll chock abuts on the flat portion, the other curved surface T is supported on a crosshead liner (not shown) so as to roll freely in the horizontal direction.

It is preferable to supply a lubricant to the curved surface T, and it is preferable to supply the lubricant by providing a through hole on the crosshead side.
Then, in order to prevent the upper work roll chock from being displaced, the upper work roll chock is mounted on the crosshead liner on the entry side in the transport direction of the material to be rolled toward the rolling mill housing 30 (the exit side in the transport direction of the material to be rolled). A biasing chock restraining device (not shown) is provided. In other words, the crosshead liner on the entry side in the transport direction of the material to be rolled is provided with a choke restraining device for urging the upper work roll chock in a direction in which the upper work roll 1 is offset while rolling the material to be rolled. . This chock restraining device has the same configuration as the chock restraining device 18 on the operator side. Further, in order to prevent the upper backup roll chock from being displaced, the upper backup roll chock is provided on the crosshead liner on the exit side in the transport direction of the material to be rolled toward the rolling mill housing 30 (the entrance side in the transport direction of the material to be rolled). A biasing chock restraining device (not shown) is provided. This chock restraining device has the same configuration as the chock restraining device 22 on the operator side.

  According to the above-described second embodiment of the cross roll rolling mill, in addition to the upper and lower work roll chocks 3 and 4, the upper and lower backup roll chocks 5 and 6 are further provided by simple means such as springs 21 and 25 in the roll offset direction (for example, the work offset). By biasing the roll chocks 3 and 4 in the direction of transporting the material to be rolled and the backup roll chocks 5 and 6 in the opposite direction), displacement of the roll chocks 3, 4, 5 and 6 within the clearance is prevented, and Troubles such as meandering, bending and breakage of the rolled material can be prevented. Also, by supplying the lubricant directly to the sliding portion between the spring holder and the chock liner, a good lubrication state can be maintained without the lubricant being flowed by the cooling water such as the roll cooling water and the chock cooling water. In addition, the cost for repair maintenance of liners can be reduced.

The reason why it is better to urge not only the upper and lower work roll chocks 3 and 4 but also the upper and lower backup roll chocks 5 and 6 toward the rolling mill housing 30 with the spring 25 will be described in detail.
As shown in FIG. 4, the upper and lower work roll chocks 3, 4 or the upper and lower backup roll chocks 5, 6 are connected between the upper work roll pivot block liner 10, the crosshead liner 13, the upper backup roll pivot block liner 12, and the crosshead liner 14. In the conveying direction of the material to be rolled or in the opposite direction in the clearance d, the parallelism between the upper work roll 1 and the upper backup roll 2 or the lower work roll 1 and the lower backup roll 2 is broken, The upper work roll 1 and the upper backup roll 2 or the lower work roll 1 and the lower backup roll 2 may slightly cross each other. The cross angle between the upper work roll 1 and the upper backup roll 2 is called a roll cross angle. Alternatively, the cross angle between the lower work roll 1 and the lower backup roll 2 is referred to as a roll cross angle. When this roll cross angle occurs, a force (referred to as a thrust force) is generated between the upper and lower work rolls 1 and the upper and lower backup rolls 2 in an axial direction.

  FIG. 3 shows the relationship between the roll cross angle and the thrust coefficient (the value obtained by dividing the thrust force by the rolling load). In the pair cloth rolling mill, it is normal that the work roll 1 and the backup roll 2 have a positional relationship in which their respective central axes are parallel to each other. However, referring to FIG. It can be seen that the thrust coefficient changes significantly due to the change in the cross angle. Therefore, when the roll cross angle is slightly increased, a large thrust force may be generated.

As shown in FIG. 4, the rolling mill has a clearance d between each of the roll chocks 3, 4, 5, and 6 and the pivot block liners or the crosshead liners 10, 13, 12, and 14, and the roll cross angle varies. Can. Normally, the fluctuation of the roll cross angle due to the clearance d cannot be controlled. For example, in the example of the rolling mill shown in FIGS. 1 (a) and 1 (b) described above and FIGS. 14 (a) and 14 (b) of the conventional example, a roll cloth having a maximum of 0.04 ° during rolling is provided. Corners arise.
FIG. 5 shows the relationship between the roll cross angle and the difference load and the thrust force when the lower work roll 1 and the lower backup roll 2 cross each other. Here, the “differential load” refers to a difference between the load on the operator side and the load on the drive side. As shown in FIG. 5, a thrust force of 1200 kN is generated even at a roll cross angle of 0.04 °.

  As shown in FIG. 6, the thrust force changes the differential load on the operator side and the drive side for balancing the moments when the rolls 1 and 2 try to rotate in the front view of the rolling mill. As shown in FIG. 5, when the thrust force is 1200 kN, the difference load changes by 600 kN. If the change in the load difference is 600 kN and the spring constant in the vertical direction of the rolling mill housing is 15000 kN / mm, the difference in elongation between the operator side and the drive side in the vertical direction (the direction in which the rolling load acts) is about 40 μm (= 600 / 15,000 × 1000). Then, as shown in FIG. 6, assuming that the material to be rolled S is being rolled, and even if the material to be rolled S passes through the center in the width direction of the upper and lower work rolls 1, the drive side on the drive side is used for differential load compensation. This means that the opening degree of the upper and lower work rolls 1 must be tightened by an amount corresponding to 40 μm.

  Usually, when rolling a material to be rolled, after rolling a material to be rolled, the operator looks at the change in the differential load when the rolling of the next material to be rolled is started, and performs leveling to make it zero. (The difference between the opening degrees of the upper and lower work rolls between the operator side and the drive side) is adopted. However, the work roll chocks 3, 4 and the backup roll chocks 5, 6, like the cross roll rolling mill, are displaced in the transport direction of the material to be rolled for the above-described reason, and the thrust force caused by the roll cross angle caused thereby. In a state in which a differential load is generated due to the thrust force, the leveling value to be taken is changed by the amount of the differential load due to the thrust force. In addition, the positions of the work roll chocks 3 and 4 and the backup roll chocks 5 and 6 are not constant and may fluctuate in the clearance d described above. When the positions of the work roll chocks 3 and 4 and the backup roll chocks 5 and 6 fluctuate within the clearance d, the thrust force is different even when a material to be rolled having the same cross angle θ and the same dimensions is no longer rolled under the same conditions. The reproducibility of the leveling value to be determined for the load is lost. Even if rolling is continued in this state, bending or meandering occurs in the material to be rolled, especially in the case of intermittent rolling such as hot rolling, and worse, the cause of the narrowing of the tail end of the material to be rolled. turn into.

  By biasing not only the upper and lower work roll chocks 3 and 4 but also the upper and lower backup roll chocks 5 and 6 toward the rolling mill housing 30 by the spring 25, the respective roll chocks 3, 4, 5, and 6 are displaced in the clearance d. Is preferably prevented. The occurrence of a cross angle (roll cross angle) between the upper and lower work rolls 1 and the upper and lower backup rolls 2 is suppressed as much as possible, and the generation of the accompanying thrust force is suppressed as much as possible, thereby further reducing problems such as meandering, bending and breakage of the material to be rolled. It can be effectively prevented.

Next, with reference to FIGS. 1 (a) and 2 (a), a description will be given of a case where the work roll 1 and the backup roll 2 are incorporated into a rolling mill and extracted.
The work roll 1 and the backup roll 2 are inserted and removed in a direction perpendicular to the paper of FIGS. 1A and 2A. When inserting or removing the work roll 1 and the backup roll 2, the crosshead 8 rotates the screw 15 side of the screw 15 and the nut 16 screwed together to prevent mechanical interference. As a result, it is opened so as to be apart from the chocks 4 and 6 by 2 to 5 mm.

  Then, after the work roll 1 and the backup roll 2 are assembled, the crosshead 8 is closed and the gap between the spring holder 19 and the chock liner 17 and the gap between the spring holder 23 and the chock liner 26 are set to be 0 mm. The gap between the spring holder 19 and the thin liner 20 and the gap between the spring holder 23 and the thin liner 24 indicate that the rolling mill housing 30 contracts in the direction in which the gap narrows as shown in FIG. Considering this, it is provided in the range of 1.0 mm to 2.0 mm. When a compressive load is applied, the gap becomes smaller in accordance with the contraction of the rolling mill housing 30, and the springs 21 and 25 are compressed between the roll chocks 4 and 6. The force acting on the springs 21 and 25 in the compressed state is preferably 200 to 300 kN per chock. If the pressure is less than 200 kN, the force for urging the roll chocks 4 and 6 toward the rolling mill housing 30 is not sufficient. If the pressure exceeds 300 kN, an excessive force is applied to the rotation of a bearing (not shown) in the roll chocks 4 and 6 to cause damage. This is because there is a risk of doing so.

  Lubrication is important for fully exerting the function of the chock restraining device 18 according to the present invention. The portions to be lubricated are between the spring holder 19 and the choc liner 17 and between the crosshead 8 and the crosshead liner 13. In particular, it is important to supply the lubricant between the surfaces on which the crosshead 8 and the crosshead liner 13 slide on each other between the curved sliding surfaces. The lubricant is preferably supplied by providing a through hole on the crosshead 8 side.

  In each of the first embodiment and the second embodiment, a single cross rolling mill in which only the operator's side, the drive side, or either one of the chocks moves toward the entry side and the exit side in the material to be rolled transport direction has been described. The pivot blocks 9 and 11 serving as rotation centers when the cross angle is changed are fixed to the rolling mill housing 30, and the work roll 1 and the backup roll 2 are inserted into and removed from the rolling mill like the crosshead 8. When doing so, the above gap cannot be opened. Therefore, the gaps between the spring holders on the pivot blocks 9 and 11 and the chocks liners on the roll chocks 3 and 5 are separated from the roll chocks 3 and 5 when the work roll 1 and the backup roll 2 are inserted into and removed from the rolling mill. In order to prevent the interference of the rolling load, it is preferable that a slight gap is formed in a state where the rolling load does not act. This gap is preferably 0.2 to 1.0 mm. If it is less than 0.2 mm, the work roll 1 and the backup roll 2 may interfere with each other when being incorporated into or removed from the rolling mill. If the rolling load exceeds 1.0 mm, the rolling mill housing 30 may be disturbed. This is because the spring holder may not reach the choc liners of the roll chocks 3 and 5 even if contracted, and the urging force may not work. In any of the first and second embodiments, the gap is set to 0.4 mm.

  Only the pair cross rolling mill (the choke restraining device for urging the work roll chock) shown in FIG. 1 of the present invention is installed in the first to seventh stands (F1 to F7) of the finishing mill 46 of the hot rolling line 40 shown in FIG. ) Is compared with the case where rolling is performed by using the conventional pair cross rolling mill shown in FIGS. 16A and 16B, and the positional deviation amount of the lower work roll chock is compared and evaluated. did. In each case, lubricant was supplied between the spring holder and the choc liner and between the crosshead and the crosshead liner. In the hot rolling line 40 shown in FIG. 7, reference numeral 41 denotes a heating furnace, 42 denotes a sizing press, 43 denotes a rough rolling mill, 44 denotes a crop shear, 45 denotes a descaling device, 47 denotes a cooling zone, and 48 denotes a winding device. is there.

  FIG. 8 shows the relationship between the rolling load in the fourth stand F4 and the positional shift amount of the lower work roll chock on the operator side on the crosshead side (entrance side in the transport direction). In this embodiment, the work roll diameter of the fourth stand is about 630 mm, the backup roll diameter is about 1550 mm, the cross angle is 0.02 to 1.04 degrees, and the rolling speed is 350 to 550 mpm.

  Referring to FIG. 8, before installation of the chock restraining device, that is, when a conventional pair cross rolling mill is applied, the lower work roll chock 104 is at most inserted into the transport direction entry side of the material to be rolled in the rolling mill housing 100 during rolling. A displacement of about 1.2 mm has occurred. On the other hand, after the installation of the chock restraining device, that is, when the pair cross rolling mill shown in FIGS. 1A and 1B of the present invention is applied, the displacement of the lower work roll chock 4 is not affected by the rolling load. It can be seen that it has been prevented.

  As shown in FIG. 10, the position of the lower work roll chocks 4 and 104 is such that the eddy current distance sensor 50 is embedded in the thin liner 20 and the distance between the eddy current distance sensor 50 and the lower work roll chocks 4 and 104 is measured. I asked for it. The signal output from the eddy current type distance sensor 50 is taken into the amplifier 51, and the movement of the lower work roll chock 4, 104 can be constantly monitored by the output from the amplifier 51.

  Next, the first to seventh stands (F1 to F7) of the finishing mill 46 of the hot rolling line 40 shown in FIG. 7 are mounted on the pair cross rolling mill (FIG. 1A and FIG. 1B) of the present invention. Only the choc restraining device for urging the work roll chock is installed), and the pair cross rolling mill shown in FIGS. And the conventional pair-cross rolling mill shown in FIGS. 16 (a) and 16 (b).

  FIG. 9 shows the relationship between the rolling load and the differential load during the actual hot rolling operation in the fourth stand F4. In the case where no chock restraint device was installed, that is, when the conventional pair cross rolling mill shown in FIGS. 16A and 16B was applied, a variation in the difference load of approximately 600 kN was observed. On the other hand, when the choke restraining device for urging the work roll chock is installed, that is, when the pair cross rolling mill shown in FIGS. 1 (a) and 1 (b) of the present invention is applied, the variation of the differential load is small. It has been reduced to 400 kN. Further, when the choke restraining device for biasing the work roll chocks and the choc restraining device for biasing the backup roll chocks are installed at the same time, that is, the pair cross rolling mill shown in FIGS. 2 (a) and 2 (b) of the present invention is applied. In this case, the variation of the difference load is further reduced to 150 kN or less.

  In the above, the case where the present invention is applied to a hot rolling line has been described as an example. However, the present invention is also applicable to, for example, a finishing mill 66 of a cold rolling line 60 shown in FIG. 11, reference numeral 61 denotes an entrance looper, 62, 65, and 67 bridle rolls, 63 a welding machine, 64 a payoff reel, 68 a shear, and 69 a carosel tension reel. The present invention is also applicable to a pair cross rolling mill of both crosses other than a single cross, and a work roll only cross rolling mill.

(A) shows the first embodiment of the cross roll rolling mill according to the present invention, (a) is a schematic view of the cross roll rolling mill viewed from the operator side, and (b) is a view taken along the line AA in (a). FIG. (A) shows the second embodiment of the cross roll rolling mill according to the present invention, (a) is a schematic view of the cross roll rolling mill viewed from the operator side, and (b) is a view taken along the line BB in (a). FIG. 4 is a graph showing a change in a thrust coefficient with respect to a cross angle (roll cross angle) between a work roll and a backup roll. FIG. 4 is a plan view showing a state in which a work roll chock or a backup roll chock has been displaced. 4 is a graph showing a relationship between a difference load and a thrust force generated when a work roll chock or a backup roll chock is displaced. It is a figure which shows the state of the moment which arises in the front view of a rolling mill when thrust force arises. It is a schematic structure figure of a hot rolling line. It is a graph which shows the relationship between the rolling load in the 4th stand F4, and the displacement amount of the lower work roll chock of the operator side which is the crosshead side. It is a graph in the 4th stand F4 which shows the relationship between the rolling load and the difference load in the hot rolling operation actually. It is explanatory drawing of the apparatus structure which measures the position of a lower work roll chock. It is a schematic structure figure of a cold rolling line. (A), (b) is a figure for demonstrating the principle of a cross roll rolling mill. It is a figure which shows distribution of the opening degree of an upper and lower work roll regarding the width direction of a to-be-rolled material. (A) is a figure for demonstrating the conventional rolling mill, (b) is a figure for demonstrating the principle of a cross roll rolling mill. It is a schematic structure figure of the principal part of a cross roll rolling mill. (A) shows the conventional cross roll rolling mill, (a) is a schematic view of the cross roll rolling mill viewed from the operator side, and (b) is a view taken along the line AA in (a). (A), (b) is a figure which shows the state of a deformation | transformation of a rolling mill housing.

Explanation of reference numerals

1,101 work roll 2,102 backup roll 3,103 upper work roll chock 4,104 lower work roll chock 5,105 upper backup roll chock 6,106 lower backup roll chock 8,107,108 crosshead 9,109 upper work roll pivot block 10 , 110 Upper work roll pivot block liner 11, 111 Upper backup roll pivot block 12, 112 Upper backup roll pivot block liner 13, 113 Cross head liner 14, 114 Cross head liner 15, 115 Screw 16, 116 Nut 17, 117 Chock liner Reference Signs List 18 Chock restraining device 19 Spring holder 20 Thin liner 21 Spring 22 Chock restraining device 23 Spring holder 24 Thin liner 2 5 Spring 26 Chock Liner 30, 100 Rolling Mill Housing 40 Hot Rolling Line 41 Heating Furnace 42 Sizing Press 43 Rough Rolling Machine 44 Crop Shear 45 Descaling Device 46 Finishing Rolling Machine 47 Cooling Zone 48 Winding Device 50 Eddy Current Distance Sensor 51 Amplifier 60 Cold rolling line 61 Entry looper 62, 65, 67 Bridle roll 63 Welding machine 64 Payoff reel 66 Finishing rolling mill 68 Shear 69 Carosel tension reel S Rolled material T Curved surface C1, C2 Offset amount d Clearance

Claims (6)

In a cross roll rolling mill equipped with a work roll chock rotatably supporting a work roll and a backup roll chock rotatably supporting a backup roll,
A cross-roll rolling mill, comprising: a spring for biasing the work roll chock in a direction in which the work roll is offset during rolling of the material to be rolled.   2. The cross-roll rolling mill according to claim 1, further comprising a spring for urging the backup roll chock in a direction in which the backup roll is offset during rolling of the material to be rolled.   The cross-roll rolling mill according to claim 1 or 2, wherein a lubricant is supplied between the spring holder and the choc liner and between the crosshead and the crosshead liner. In a rolling method using a cross roll rolling mill including a work roll chock rotatably supporting a work roll and a backup roll chock rotatably supporting a backup roll,
A rolling method using a cross-roll rolling mill, wherein, when rolling a material to be rolled, the work roll chock is rolled while being urged by a spring in a direction in which the work roll is offset during rolling.   The rolling method using a cross-roll rolling mill according to claim 4, wherein, when rolling the material to be rolled, the backup roll chock is rolled while being urged by a spring in a direction in which the backup roll is offset during rolling. .   The rolling method using a cross roll rolling mill according to claim 4 or 5, wherein a lubricant is supplied between the spring holder and the choc liner and between the crosshead and the crosshead liner.

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