KR20040086192A - Cross roll type rolling mill and rolling method using the same - Google Patents

Abstract

PURPOSE: To provide a cross roll type rolling mill which is constructed in a simple structure and installed inexpensively, has high reliability and is capable of preventing position misalignment of respective roll chocks within a clearance range, and a rolling method using the same. CONSTITUTION: In a cross roll type rolling mill comprising work roll chocks(3,4) for rotatably supporting work rolls(1) and back up roll chocks(5,6) for rotatably supporting back up rolls(2), the cross roll type rolling mill is characterized in that springs for elastically supporting the work roll chocks are formed in a direction in which the work rolls are off set during rolling of a material to be rolled, wherein springs for elastically supporting the back up roll chocks are additionally formed in a direction in which the back up rolls are off set during rolling of the material to be rolled, and wherein a lubricating agent is supplied between spring holders and chock liners and between cross heads(8) and cross head liners(13,14).

Description

Cross roll rolling mill and rolling method using the same {CROSS ROLL TYPE ROLLING MILL AND ROLLING METHOD USING THE SAME}

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

The cross roll rolling mill is characterized by rolling the rolled material in a state of crossing the upper and lower work rolls. 12A and 12B show the positional relationship between the upper and lower work rolls and the rolled material. 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 disposed so as to cross at a predetermined cross angle (θ: variable) with the widthwise center portion of the rolled material S as the cross center (cross point: c). Thereby, as shown in FIG. 12B, a difference arises in 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 ends. The distribution about the width direction of the to-be-rolled material S of the opening degree of the upper and lower work rolls 101 becomes a secondary curve as shown in FIG. If the cross angle θ is increased, the degree of convexity under the secondary curve becomes steep, and when the cross angle θ is reduced, the degree of convexity under the secondary curve becomes sloping. When the cross angle θ is 0, the opening degree of the upper and lower cross rolls is constant.

The rolling mill prior to the appearance of the cross-roll rolling mill has a plate thickness distribution of the rolled material S due to the bending of the upper and lower work rolls 101 and the upper and lower back-up rolls 102 due to the rolling load during rolling. It tended to be thick at the center of the width and thin at the width end. However, in the cross-roll rolling mill, the upper and lower work rolls 101 and the upper and lower back-up rolls 102 are bent by setting the above-described cross angle θ optimally and making the opening degree of the upper and lower work rolls 101 an optimal secondary curve. As shown in FIG. 14B, the widthwise plate thickness distribution after rolling of the rolled material S can be approximated to a uniform one, and the film thickness precision can be improved. For this reason, in recent years, many cross-roll rolling machines are provided regardless of hot rolling and cold rolling.

The outline of the principal part of a cross roll rolling mill is shown in FIG. The side on which the motor for driving the upper and lower work rolls 101 is disposed is called the drive side, and the side operated by the operator on the opposite side is called the operator side. The rotary shaft of the upper work roll 101 is rotatably supported by a pair of upper work roll chokes 103 on the drive side and the operator side. The rotating shaft 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. Moreover, the rotating shaft of the upper backup roll 102 arrange | positioned above the upper work roll 101 is rotatably supported by the pair of upper backup roll chocks 105 of a drive side and an operator side. The rotating shaft of the lower back-up roll 102 arrange | positioned under the lower work roll 101 is rotatably supported by the pair of lower back-up roll chokes 106 of a drive side and an operator side.

In this cross-roll rolling mill, unlike the previous rolling mill, the upper and lower back-up roll chocks 105 and 106 and the upper and lower work roll chocks 103 and 104 are arranged in the form of enclosing the rolled material S in the conveying direction and the reverse direction thereof. The upper work roll 101 and the upper back-up roll are provided by having the cross heads 107 and 108, and driving the cross heads 107 and 108 in the conveying direction of the rolled material S indicated by the large arrows in FIG. 102, the lower work roll 101, and the lower back-up roll 102 are driven in pairs to set the cross angle θ described above.

As shown in FIG. 15, a method of driving the upper work roll 101, the upper back up roll 102, the lower work roll 101, and the lower back up roll 102 in pairs is called a pair cross method, and the upper and lower work pieces The method of driving only the roll 101 is called a work roll single cross system.

In addition, the cross head is disposed on either the drive side or the operator side, and the cross side on which the cross head is disposed is crosswise and the opposite side is pivoted (when there is a cross head on the drive side of the upper roll, Crosshead on the operator side of the roll). The cross-roll rolling mill shown in FIG. 15 shows the corresponding one, where the upper work roll choke 103 and the upper backup roll choke (located on the drive side of the upper work roll 101 and the upper backup roll 102) The cross work head 107 is arrange | positioned in the form which encloses 105 in the conveyance direction of the to-be-rolled material S, and the reverse direction, and the lower work roll arrange | positioned at the operator side of the lower work roll 101 and the lower backup roll 102. The cross head 108 is arranged in such a manner as to surround the choke 104 and the lower backup roll choke 106 in the conveying direction of the rolled material S and in the reverse direction thereof. Cross heads may be arranged on the operator side and the drive side of the lower work roll and the lower backup roll. In addition, the cross-head is arrange | positioned at both a drive side and an operator side in both the upper and lower parts, and it does not form a pivot by crossing both cross heads. Hereinafter, although the case of a fair cross system and a single cross system is demonstrated, since the work roll single cross system and both cross systems are also the same as a basic function, the cross roll rolling mill as used in this invention shall mean including these.

The schematic diagram which looked at the cross roll rolling mill of FIG. 15 from FIG. 16A and FIG. 16B from an operator side is shown. This cross-roll rolling mill is a fair cross system and a single cross system. In this cross-roll rolling machine, the upper work roll chocks 103 and the upper back-up roll chocks 105 disposed on the drive side of the upper work roll 101 and the upper back-up roll 102 are conveyed in the direction of the rolled material S. And a pair of cross heads (not shown) are arranged so as to surround in the reverse direction. The form surrounding the lower work roll choke 104 and the lower backup roll choke 106 disposed on the operator side of the lower work roll 101 and the lower back up roll 102 in the conveying direction of the rolled material S and its reverse direction. A pair of cross heads 108 are arranged.

Here, each cross head 108 is freely supported with respect to the rolling mill housing 100 in the conveyance direction of a to-be-rolled material. Each cross head 108 is driven by a screw 115 screwed to a nut 116 fixed to the rolling mill housing 100. As shown in FIG. 16B, the curved surface T is formed in the horizontal direction (up-down direction in FIG. 16B) in the opposing part of each crosshead 108 at the lower work roll choke 104 side. Each lower crosshead liner 113 is provided with a curved surface T corresponding thereto. The curved surface T is freely in contact with the cross head 108 in the horizontal direction. On the other hand, the lower cross head liner 113 abuts on the flat portion with respect to the choke liner 117 formed on the lower work roll choke 104. Moreover, the same curved surface as the above-mentioned T which curves by the constant curvature in the horizontal direction is formed also in the opposing part of the lower back-up roll choke 106 side of each cross head 108. As shown in FIG. Each lower crosshead liner 114 having a corresponding curved surface T is in contact with a flat liner, not shown, formed on the lower backup roll choke 106, while the other curved surface T is formed. The crosshead 108 is freely abutted in the horizontal direction. Each cross head 108 and cross head liners 113 and 114 have a structure in which the cross angle θ can be changed by sliding the sliding surfaces forming the curved surface T with each other. The form surrounding the upper work roll choke 103 and the upper backup roll choke 105 disposed on the drive side of the upper work roll 101 and the upper backup roll 102 in the conveying direction and the reverse direction of the rolled material S Each of the cross heads arranged in the shape of the cross heads has the same structure as that of the cross heads 108, and at the same time the curved surface T is formed on the opposing surface of the upper work roll choke 103 and the upper backup roll choke 105, these curves A crosshead liner (not shown) having a curved surface is formed on each of the surfaces T. As shown in FIG.

On the other hand, a pair of upper work roll pivot blocks 109 are formed in the rolling mill housing 100 so as to face the upper work roll chocks 103 arranged on the operator side of the upper work roll 101. On the opposite side of the upper work roll choke 103 side of each upper work roll pivot block 109, a curved surface T is formed with a constant curvature in the horizontal direction, and each upper workpiece having a curved surface T corresponding thereto is formed. The roll pivot block liner 110 abuts in a flat portion against an unshown choke liner formed in the upper work roll choke 103, while the other curved surface T is horizontal to the upper work roll pivot block 109. Freely abuts in the direction. In addition, a pair of upper backup roll pivot blocks 111 are formed in the rolling mill housing 100 so as to face the upper backup roll chocks 105 arranged on the operator side of the upper backup roll 102. On the opposite side of the upper backup roll choke 105 side of each upper backup roll pivot block 111, a curved surface T is formed with a constant curvature in the horizontal direction, and each upper backup having a curved surface T corresponding thereto is formed. The roll pivot block liner 112 abuts against the upper backup roll choke 105 in a flat portion, while the other curved surface T is electrically freely abutted in the horizontal direction with the upper backup roll pivot block 111. . In addition, the lower work roll pivot block, the lower work roll pivot block liner, the lower back up roll pivot block, and the lower back up roll pivot block liner are also formed on the drive side of the lower work roll 101 and the lower back up roll 102.

By the way, generally in rolling of the to-be-rolled material S which concerns on a rolling mill, as shown in Unexamined-Japanese-Patent No. 8-197110, the work roll 101 is carried out with respect to the back-up roll 102 with respect to the back-up roll 102 in the upper and lower parts. It is shifted in a conveyance direction. This is called offset, and the offset amount of the work roll with respect to the center of a rolling mill is C1, and the offset amount of the backup roll is C2 in FIG. 16A. Generally, the sum of C1 and C2 is called an offset amount. The offset causes the horizontal component force (also called the offset component force) to be generated in the direction of the arrow e in FIG. 16A which is the conveyance direction of the rolled material S. FIG. The direction of arrow e coincides with the direction in which the work roll offsets. The upper and lower back-up rolls 102 generate horizontal force in the direction of the arrow f opposite to the conveying direction of the rolled material S. The direction of the arrow f coincides with the direction in which the backup roll offsets. Then, the upper and lower work roll chokes 103, 104 are pressed in the conveying direction of the rolled material S, the upper and lower back up roll chocks 105, 106 facing the reverse direction, and the upper and lower work roll chokes 103, 104 are rolled material ( It is pressed by the rolling mill housing 100 of the conveyance direction exit side of S), and the upper and lower back-up roll chocks 105 and 106 are pressed and stabilized by the rolling mill housing 100 of the conveyance direction entry side of the to-be-rolled material S.

However, as shown in FIGS. 16A and 16B, the choke liner and work roll pivot formed between each roll choke 103, 104, 105, 106 and the rolling mill housing 100 (exactly, the upper work roll choke 103). Between the block liner 110, between the choke liner 117 and the cross head liner 113 formed in the lower workroll choke 104, between the upper backup roll choke 105 and the backup roll pivot block liner 112 and the lower backup. Since there is a clearance d between the roll chocks 106 and the crosshead liner 114, the positioning of the rolled material S of each roll choke 103, 104, 105, 106 in the conveying direction is not performed. Otherwise, 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, for example, when the cross angle θ is changed during rolling when the rolling load is small, that is, the pressing force due to the offset is small. The conveying direction of the rolled material S or its If the position shift occurs in the direction, and if it is non-uniform on the right and left (operator side on the drive side and the opposite side), the opening degree of the upper and lower work rolls 101 occurs in the width direction left and right of the rolled material S, and the rolled material There was a problem of (S) meandering, bending and, in severe cases, leading to fracture.

In order to prevent this, for example, Japanese Patent Laid-Open No. 9-285806 or Japanese Patent Laid-Open No. 2001-113308, an apparatus for elastically supporting a bearing box (choke) with a hydraulic cylinder in a conveying direction of a rolled material, or Japanese Patent Laid-Open As in Japanese Patent Application Laid-Open No. 7-32018, a method of minimizing the gap between the choke and the rolling mill housing has been proposed by predicting the rolling mill housing shrinkage due to the rolling load.

Here, the housing shrinkage refers to the deformation of the conveying direction of the rolled material generated in the center of the housing in the vertical direction by the rolling load acting in the vertical direction of the rolling mill housing during rolling, that is, the gap between the entrance and exit of the housing, as shown in Fig. 17B. Indicates contraction of.

However, as in the above-described Japanese Patent Application Laid-Open No. Hei 9-285806 or Japanese Patent Laid-Open No. 2001-113308, it is necessary to install a hydraulic cylinder in a very narrow place by a method of elastically supporting the choke toward the rolling mill housing by the hydraulic cylinder. As a result, there is a problem in that a special cylinder structure becomes expensive and the installation cost is high. This problem is particularly remarkable in the case of improving the already installed rolling mill.

In addition, the piping for supplying hydraulic pressure to the hydraulic cylinder does not interfere with the conveyance of the material to be rolled, and it is necessary to pass through the space where neither the rolling mill housing nor the choke exists. Space is also required to install the piping support. In addition to the special cylinder structure of the hydraulic cylinder described above, troubles such as oil leakage are likely to occur, and there are problems of reliability, cost, and maintenance. Furthermore, there was a problem that the operation rate of the facility is lowered to secure the repair time.

Usually, a large amount of roll cooling water, choke cooling water, etc. exists in the vicinity of the hot rolling mill. It is preferable to arrange the supply port of the lubricant to the sliding portion between the choke and the housing or between the choke and the hydraulic cylinder so that the lubricant does not flow by the cooling water. However, in order to arrange the supply port of the lubricant in the sliding portion between the choke and the hydraulic cylinder, it cannot be realized because it must pass through the hole for supplying the lubricant in the hydraulic cylinder. In addition, when the choke is pressed with the hydraulic cylinder, the sliding pressure increases, and the cost of maintenance increases because the wear amount of the choke liner and the cylinder surface increases.

Further, in the method of minimizing the gap between the choke and the rolling mill housing by predicting the rolling mill housing shrinkage due to the rolling load, as in Japanese Patent Laid-Open No. 7-32018, the rolling deformation is small, that is, the housing deformation amount is small. In some cases, the gap between the choke and the rolling mill housing may remain, and the choke position may not be completely stabilized. Moreover, when setting the space | interval too narrowly between a choke and a rolling mill housing, there existed a problem that a choke was stuck by a housing, and equipment troubles, such as a roll failure and a burnout of a bearing, may generate | occur | produce.

Accordingly, the present invention has been made in view of the above-described problems, and an object thereof is a simple structure, a low installation cost, and a cross-roll rolling mill capable of preventing a misalignment within the clearance of each roll choke with high reliability and the same. It is to provide a used rolling method.

FIG. 1A shows a first embodiment of a cross roll rolling mill according to the present invention, FIG. 1A is a schematic view of the cross roll rolling mill viewed from the operator side, and FIG. 1B is a view seen in the direction of the arrow along the line A-A in FIG. 1A.

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. 2B is a view seen in the direction of the arrow along the line B-B in FIG. 2A.

3 is a graph showing the change in the thrust coefficient with respect to the cross angle (roll cross angle) of a work roll and a backup roll.

4 is a plan view showing a state in which a work roll choke or a backup roll choke causes a position shift.

5 is a graph showing a relationship between a load difference and a thrust force generated when a work roll choke or a backup roll choke causes a misalignment.

Fig. 6 is a diagram showing the shape of moments occurring in the front view of the rolling mill when a thrust force is generated.

7 is a schematic configuration diagram of a hot rolling line.

FIG. 8: is a graph which shows the relationship between the rolling load in the 4th stand F4, and the position shift amount of the lower work roll choke by the operator side used as the crosshead side.

FIG. 9 is a graph showing the relationship between the rolling load and the load difference actually during the hot rolling operation in the fourth stand F4.

It is explanatory drawing of the apparatus structure which measures the position of a lower work roll choke.

11 is a schematic configuration diagram of a cold rolling line.

12A and 12B are views for explaining the principle of a cross-roll rolling mill.

It is a figure which shows the distribution regarding the width direction of the to-be-rolled material of the opening degree of an upper and lower work roll.

It is a figure for demonstrating the conventional rolling mill.

14B is a diagram for explaining the principle of a cross-roll rolling mill.

It is a schematic block diagram of the principal part of a cross roll rolling mill.

Fig. 16A shows a cross roll rolling mill of a conventional example, Fig. 16A is a schematic view of the cross roll rolling mill viewed from the operator side, and Fig. 16B is a view seen in the direction of the arrow along the line A-A in Fig. 16A.

17A and 17B are views showing the shape of deformation of the rolling mill housing.

Explanation of symbols on the main parts of the drawings

1, 101: work roll 2, 102: backup roll

3, 103: upper work roll choke 4, 104: lower work roll choke

5, 105: upper backup roll choke 6, 106: lower backup roll choke

8, 107, 108: cross head 9, 109: upper work roll pivot block

10, 110: upper work roll pivot block liners 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: choke liner

18: choke restraint device 19: spring holder

20: thin liner 21: spring

22: choke restraint 23: spring holder

24: thin liner 25: spring

26: chalk liner 30, 100: rolling mill housing

40: hot rolling line 41: heating furnace

42: sizing press 43: crude rolling mill

44: crop shear 45: descaling device

46: finish rolling mill 47: cooling zone

48: winding device 50: vortex type distance sensor

51: amplifier 60: cold rolling line

61: entrance looper 62, 65, 67: bridal roll

63: welder 64: payoff reel

66: finish rolling mill 68: shea

69: carousel tension reel S: rolled material

T: curved surface C1, C2: offset amount

d: clearance

1. A cross-roll rolling mill according to the present invention is a cross-roll rolling machine having a work roll choke for rotatably supporting a work roll and a backup roll choke for rotatably supporting a back-up roll, wherein the workpiece is rolled during rolling. A spring for elastically supporting the work roll choke is formed in a direction in which the roll is offset.

2. The cross-roll rolling mill according to the present invention further comprises a spring for elastically supporting the back-up roll choke in a direction in which the back-up roll offsets the rolled material during rolling. It is done.

3. The cross-roll rolling mill according to the present invention is characterized in that the lubricant is supplied between the spring holder and the choke liner and between the crosshead and the crosshead liner in the invention described in 1. and 2.

4. The rolling method using the cross roll rolling mill which concerns on this invention is a rolling method using the cross roll rolling mill provided with the work roll choke which rotatably supports a work roll, and the backup roll choke which rotatably supports a backup roll. And rolling the work roll choke while elastically supporting the spring in the direction in which the work roll is offset during rolling when rolling the rolled material.

5. The rolling method using the cross-roll rolling mill which concerns on this invention is 4. In the invention of the base material, at the time of the said rolled material to roll, the said backup roll chalk is elastic with a spring in the direction which the said backup roll offsets during rolling. It is characterized by rolling while supporting.

6. The rolling method using the cross-roll rolling mill which concerns on this invention is supplying a lubricant between the spring holder and a choke liner, and between a crosshead and a crosshead liner in the invention of 4. and 5. It is characterized by the above-mentioned. .

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Next, embodiment of this invention is described with reference to drawings. 1A and 1B show a first embodiment of a cross-roll rolling mill according to the present invention, FIG. 1A is a schematic view of the cross-roll rolling mill viewed from the operator side, and FIG. 1B is a view seen in the direction of the arrow along the line AA in FIG. 1A. to be.

In the cross-roll rolling mill shown in FIG. 1A, first, the lower roll will be described. A pair of cross heads 8 are arranged in such a manner as to surround the work roll chocks 4 and the lower back up roll chocks 6 rotatably supporting the lower back up rolls 2 in the conveying direction and the reverse direction of the rolled material. It is.

Here, each cross head 8 is freely supported with respect to the rolling mill housing 30 in the conveyance direction of a to-be-rolled material. Each cross head 8 is driven by a screw 15 screwed to a nut 16 fixed to the rolling mill housing 30. And as shown in FIG. 1B, the curved surface T is formed in the horizontal direction (up-down direction in FIG. 1B) by the curvature in the opposing part of the lower work roll chocks 4 side of each crosshead 8, and Each lower crosshead liner 13 having a corresponding curved surface T is in contact with the choke liner 17 formed on the lower work roll choke 4 in the flat portion, while the other curved surface T ) Is freely in contact with the cross head 8 in a horizontal direction. In addition, the same curved surface as the above-mentioned T curved at a constant curvature in the horizontal direction is also formed in the opposing portion on the lower back-up roll choke 6 side of each cross head 8, and the curved surface T corresponding thereto is formed. Each lower crosshead liner 14 formed abuts on a flat portion with respect to the not shown chalk liner formed on the lower back-up roll choke 6, while the other curved surface T is horizontal with the crosshead 8. By electric contact freely. The cross heads 8 and the cross head liners 13 and 14 are configured to be capable of changing the cross angle by sliding the curved surface sliding surfaces with each other.

In the state shown in FIG. 1A, the lower work roll choke 4 is the lower backup roll choke 6 in the conveying direction (the same as the direction in which the horizontal component force e is generated) of the rolled material by the cross head liner 13. ) Is positioned in the state offset by the crosshead liner 14 in the direction opposite to the conveying direction of the rolled material (the same as the direction in which the horizontal component force f is generated). In order to prevent misalignment of the lower crossroll choke 4, the crosshead liner 13 at the side of the conveyance direction of the rolled material has a lower work roll choke 4 toward the rolling mill housing 30 (the conveyance direction of the rolled material). The choke restraint apparatus 18 which elastically supports is provided. In other words, the choke restraint device 18 elastically supports the lower work roll choke 4 in a direction in which the lower work roll 1 is offset during rolling of the rolled material on the crosshead liner 13 at the side of the conveyance direction of the rolled material. ) Is installed.

This choke restraint 18 is comprised of the crosshead liner 13, the thin liner 20, the spring 21, and the spring holder 19, as shown in FIG. The spring holder 19 is pressed against the choke liner 17 by the spring 21 so that the lower work roll choke 4 is elastically supported toward the rolling mill housing 30. As the spring 21, a disc spring is preferable. If it has an elastic body or its equivalent function, it is applicable and it is not limited to a disc spring.

The crosshead liner 13 and the spring holder 19 have a through hole for feeding, and the lubricant supplied between the crosshead and the crosshead liner is passed through the spring holder 19 and the choke through the through hole. It is supposed to be supplied to the sliding surface of the liner.

On the other hand, FIG. 1A shows the operator side, whereas on the drive side, which is not shown, the rolling work of the rolling mill housing 30 is carried out in the lower work roll pivot block liner (not shown) on the entry side of the rolled material in the conveying direction. ), A choke restraint device (not shown) is provided to elastically support the lower work roll choke (not shown). This choke restraint device has the same structure as the choke restraint device 18 on the operator side.

Next, with reference to the upper roll, a pair of upper work rolls oppose the upper work roll choke 3 rotatably supporting the upper work roll 1 disposed on the operator side in the upper work roll 1. The pivot block 9 is formed in the rolling mill housing 30. On the opposite side of the upper work roll choke 3 side of each upper work roll pivot block 9, a curved surface T that curves with a constant curvature in the horizontal direction is formed, and the corresponding curved surface T is formed. The upper workroll pivot block liner 10 abuts in a flat portion against an unshown choke liner formed in the upper workroll choke 3, while the other curved surface T is the upper workroll pivot block 9. And freely abut in the horizontal direction.

Further, the pair of upper backup roll pivot blocks 11 are provided in the rolling mill housing so as to face the upper backup roll choke 5 rotatably supporting the upper backup roll 2 disposed on the operator side on the upper backup roll 2. It is formed in 30. On the opposite side of the upper back-up roll choke 5 side of each upper back-up roll pivot block 11 is formed a curved surface T that curves with a constant curvature in the horizontal direction, and the corresponding curved surface T is formed. The upper backup roll pivot block liner 12 abuts against the upper backup roll choke 5 in a flat portion, while the other curved surface T is freely supported in a horizontal direction with the upper backup roll pivot block 11 in a horizontal direction. It is.

In the state shown in FIG. 1A, the upper work roll choke 3 is in the conveying direction of the rolled material by the upper work roll pivot block liner 10, and the upper backup roll choke 5 is the upper backup roll pivot block liner 12. The positioning is performed in the state offset by the direction reverse to the conveyance direction of the to-be-rolled material. In order to prevent misalignment, the choke for elastically supporting the upper work roll choke 3 toward the rolling mill housing 30 (the exit direction in the conveying direction of the rolled material) is provided on the upper work roll pivot block liner 10 at the entrance side of the rolled material. The restraining device 18 is provided. In other words, the upper work roll pivot block liner 10 in the conveyance direction entrance side of the rolled material has a choke restraint elastically supporting the upper work roll choke 3 in the direction in which the upper work roll 1 is offset during rolling the rolled material. The apparatus 18 is installed. This upper work roll choke restraint 18 has the same structure as the choke restraint 18 which elastically supports the lower work roll choke 4. The upper work roll choke restraint 18 is comprised of an upper work roll pivot block liner 10, a thin liner (not shown), a spring (not shown), and a spring holder (not shown). A spring holder (not shown) is pressed against the choke liner by means of a spring (not shown) to thereby elastically support the upper work roll choke 3 toward the rolling mill housing 30.

The upper work roll pivot block liner 10 and the spring holder (not shown) have a through hole for feeding, and the lubricant supplied between the upper work roll pivot block 9 and the upper work roll pivot block liner 10. Through this through hole, the surface of the spring holder, in other words, is supplied to the sliding surfaces of the spring holder and the choke liner.

On the other hand, FIG. 1A shows the operator side, while on the drive side not shown, the upper work roll 1 and the upper work roll 1 arranged on the drive side of the upper backup roll 2 are rotatable. A pair of crossheads in the form of enclosing a supporting upper work roll choke (not shown) and an upper backup roll choke (not shown) rotatably supporting the upper backup roll 2 in the conveying direction and the reverse direction of the rolled material. (Not shown) is arranged. A curved surface T that curves with a constant curvature in the horizontal direction is formed on the opposite side of the upper work roll choke side of each cross head, and each upper cross head liner on which the curved surface T corresponding thereto is formed is an upper workpiece. While the flat surface portion is abutted against the choke liner formed on the roll choke, the other curved surface is freely abutted in the horizontal direction with the cross head (not shown). In addition, a curved surface T that curves at a constant curvature in the horizontal direction is formed on the opposite side of the upper backup roll choke side of each cross head, and each upper crosshead liner on which the curved surface T corresponding thereto is formed is the upper backup. The other curved surface T is freely supported in the horizontal direction with the upper back-up roll cross head (not shown) while abutting against the choke liner (not shown) formed in the roll chalk.

In order to prevent the position shift of the upper work roll choke, the upper work roll crosshead liner at the inlet side of the rolled direction of the rolled material elastically supports the upper workrolled choke toward the rolling mill housing 30 (outside the rolled side of the rolled material). A choke restraint device (not shown) is provided. In other words, the choke restraint device which elastically supports the upper work roll choke is provided in the upper work roll crosshead liner in the conveyance direction entrance side of the to-be-rolled material in the direction which the upper work roll 1 offsets during rolling. This choke restraint device has the same structure as the choke restraint device 18 on the operator side.

According to the first embodiment of the cross-roll rolling mill explained above, the roll offset direction (upper and lower work roll choke 3) is obtained by the simple means of the spring 21 for the upper and lower work roll chokes 3 and 4 on both the operator side and the drive side. , 4) is elastically supported in the conveying direction of the material to be rolled, so that the position shift in clearance with respect to the upper work roll pivot block liner 10 and the cross head liner 13 of the upper and lower work roll chokes 3 and 4 is prevented. It is possible to prevent troubles such as meandering, bending and breaking of the rolled material.

Next, 2nd Embodiment of the cross roll mill which concerns on this invention is described with reference to FIG. 2A and FIG. 2B. 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. 2B is a view seen in the direction of the arrow along the line B-B in FIG. 2A.

The cross-roll rolling mill shown in FIG. 2A is a point in which the choke restraint device 22 which elastically supports the upper and lower back-up roll chocks 5 and 6 in the direction which the upper and lower back-up rolls 2 offset during rolling of the rolled material is shown. It is different from the cross roll rolling mill shown to 1a. This is specifically described below.

In the cross-roll rolling machine shown in FIG. 2A, first, the lower roll will be described. The lower roll which rotatably supports the lower work roll 1 disposed on the operator side of the lower work roll 1 and the lower back-up roll 2 is described. A pair of cross heads 8 are arranged in such a manner as to surround the work roll chocks 4 and the lower back up roll chocks 6 rotatably supporting the lower back up rolls 2 in the conveying direction and the reverse direction of the rolled material. It is.

Here, each cross head 8 is freely supported with respect to the rolling mill housing 30 in the conveyance direction of a to-be-rolled material. Each cross head 8 is driven by a screw 15 screwed to a nut 16 fixed to the rolling mill housing 30. And in the opposing part by the side of the lower work roll chocks 4 of each crosshead 8, the curved surface T is formed by the curvature constant in a horizontal direction, and each lower cross in which the curved surface T corresponding thereto was formed. The head liner 13 abuts against the choke liner 17 formed on the lower work roll choke 4 in a flat portion, while the other curved surface T is free to fit the cross head 8 in a horizontal direction. Is touching. In addition, each of the lower crosses each having a curved surface T having a constant curvature in the horizontal direction is formed on the opposite side of the lower back-up roll choke 6 side of each cross head 8. The head liner 13 abuts against the lower back-up roll choke 6 in the flat portion, while the other curved surface T is freely supported in the horizontal direction with the cross head 8. The cross heads 8 and the cross head liners 13 and 14 are configured to be capable of changing the cross angle by sliding the curved surface sliding surfaces with each other.

In the state shown in FIG. 2A, the lower work roll choke 4 is the lower back-up roll choke 6 in the conveying direction (the same as the direction in which the horizontal component force e is generated) of the rolled material by the cross head liner 13. ) Is positioned in the state offset by the crosshead liner 14 in the direction opposite to the conveying direction of the rolled material (the same as the direction in which the horizontal component force f is generated). In order to prevent misalignment of the lower crossroll choke 4, the crosshead liner 13 at the side of the conveyance direction of the rolled material has a lower work roll choke 4 toward the rolling mill housing 30 (the conveyance direction of the rolled material). The choke restraint apparatus 18 which elastically supports is provided. In other words, the choke restraint device 18 elastically supports the lower work roll choke 4 in a direction in which the lower work roll 1 is offset during rolling of the rolled material on the crosshead liner 13 at the side of the conveyance direction of the rolled material. ) Is installed. This choke restraint device 18 has the same configuration as that shown in FIG. 1B and consists of a cross head liner 13, a thin liner 20, a spring 21, and a spring holder 19. The spring holder 19 is pressed against the choke liner 17 by the spring 21 so that the lower work roll choke 4 is elastically supported toward the rolling mill housing 30.

The crosshead liner 13 and the spring holder 19 are formed with a through hole for feeding, and the lubricant supplied between the crosshead and the crosshead liner passes through the through hole to the surface of the spring holder 19, in other words, the spring. It is supposed to be supplied to the sliding surfaces of the holder and the choke liner 17.

In addition, in order to prevent the position shift of the lower back-up roll choke 6, the cross-head liner 14 on the exit side in the conveying direction of the rolled material has a lower back-up roll choke (to the rolling mill housing 30: the conveying direction of the rolled material). The choke restraint device 22 which elastically supports 6) is provided. In other words, the choke restraint device 22 which elastically supports the lower back-up roll choke 6 in the direction in which the lower back-up roll 2 offsets the rolled material in the crosshead liner 14 on the exit side of the rolled material in the conveying direction. ) Is installed. As shown in FIG. 2B, the choke restraint 22 consists of a cross head liner 14, a thin liner 24, a spring 25, and a spring holder 23. The spring 25 presses the spring holder 23 against the choke liner 26, thereby pressing the lower back-up roll choke 6 toward the rolling mill housing 30.

The crosshead liner 14 and the spring holder 23 have a through hole for feeding, and the lubricant supplied between the crosshead and the crosshead liner is connected to the surface of the spring holder 22 through the through hole, in other words, the spring. The sliding surface of the holder and the choke liner 26 is supplied.

FIG. 2A shows the operator side, while on the drive side, which is not shown, the lower work roll pivot block liner (not shown) on the exit side of the conveying direction of the rolled material has a rolling mill housing (outside the conveying direction of the rolled material). The choke restraint device (not shown) which elastically supports the lower work roll choke (not shown) is provided. This choke restraint device has the same structure as the choke restraint device 18 on the operator side. Further, the lower back-up roll pivot block liner (not shown) on the exit side of the rolled material in the conveying direction has a choke restraining device that elastically supports the lower back-up roll choke (not shown) toward the rolling mill housing 30 (the conveying direction of the rolled material). Not shown) is provided. This choke restraint device has the same structure as the choke restraint device 2 on the operator side.

Next, with reference to the upper roll, a pair of upper work roll pivot blocks 9 are placed on the rolling mill housing 30 so as to face the upper work roll choke 3 rotatably supporting the upper work roll 1. Formed. On the opposite side of the upper work roll choke 3 side of each upper work roll pivot block 9, a curved surface T is formed with a constant curvature in the horizontal direction, and each upper workpiece having a curved surface T corresponding thereto is formed. The roll pivot block liner abuts against the choke liner formed on the upper work roll choke 3 in the flat portion, while the other curved surface T is electrically freely abutted in the horizontal direction with the upper work roll pivot block 9. have.

In addition, a pair of upper backup roll pivot blocks 11 are formed in the rolling mill housing 30 so as to face the upper backup roll chocks 5 rotatably supporting the upper backup roll 2. On the surface opposite to the upper backup roll choke 5 of each upper backup roll pivot block 11, a curved surface T is formed with a constant curvature in the horizontal direction, and each upper backup roll pivot block on which the curved surface T is formed. The liner 12 abuts against the upper backup roll choke 5 at the flat portion, while the other curved surface T is freely supported in the horizontal direction with the upper backup roll pivot block 11.

In the state shown in FIG. 2A, the upper work roll choke 3 is in the conveying direction of the rolled material by the upper work roll pivot block liner 10, and the upper backup roll choke 5 is the upper backup roll pivot block liner 12. The positioning is performed in the state offset by the direction reverse to the conveyance direction of the to-be-rolled material. In order to prevent the position shift of the upper work roll choke 3, the upper work roll pivot block liner 10 at the inlet side of the conveying direction of the rolled material has an upper work roll choke toward the rolling mill housing 30: the conveying direction of the rolled material. The choke restraint device 18 which elastically supports 3 is provided. In other words, the upper work roll pivot block liner 10 in the conveyance direction entrance side of the rolled material has a choke restraint elastically supporting the upper work roll choke 3 in the direction in which the upper work roll 1 is offset during rolling the rolled material. The apparatus 18 is installed. This choke restraint 18 has the same structure as the choke restraint 18 which elastically supports the lower work roll choke 4. The choke restraint 18 consists of an upper workroll pivot block liner 10, a thin liner (not shown), a spring, a spring holder. A spring holder (not shown) is pressed against the choke liner by means of a spring (not shown), so that the upper work roll choke 3 is elastically supported toward the rolling mill housing 30.

The upper work roll pivot block liner 10 and the spring holder (not shown) have a through hole for feeding, and the lubricant supplied between the upper work roll pivot block 9 and the upper work roll pivot block liner 10. Through this through hole, the surface of the spring holder, in other words, is supplied to the sliding surfaces of the spring holder and the choke liner.

Moreover, in order to prevent the position shift of the upper backup roll choke 5, the upper backup roll pivot block liner 12 of the conveyance direction exit side of the to-be-rolled material is rolled up toward the rolling mill housing 30 (the conveyance direction entry side of a to-be-rolled material). The choke restraint device 22 which elastically supports the roll choke 5 is provided. In other words, the upper backup roll pivot block liner 12 on the exit side of the rolled material in the conveying direction has a choke restraint elastically supporting the upper backup roll choke 5 in a direction in which the upper backup roll 2 offsets the rolled material during rolling. The apparatus 22 is installed. This choke restraint device 22 has the same structure as shown in Fig. 2B.

FIG. 2A shows the operator side, while on the drive side not shown, the upper work roll choke (not shown) and the upper backup roll 2 rotatably supporting the upper work roll 1 are rotatable. A pair of cross heads (not shown) are arranged in such a manner as to surround the supporting upper backup roll chocks (not shown) in the conveying direction and the reverse direction of the rolled material. A curved surface T is formed on the opposite side of the upper work roll choke side of each cross head with a constant curvature in the horizontal direction, and a cross head liner having a curved surface T corresponding thereto is formed on the upper work roll choke. While the choke liner abuts against the flat portion, the other curved surface T is freely supported in a horizontal direction with the crosshead liner (not shown). In addition, a curved surface T that curves at a constant curvature in the horizontal direction is formed on the opposite side of the upper back-up roll choke side of each cross head, and the cross-head liner on which the curved surface T corresponding thereto is formed is the upper back-up roll choke. On the other hand, the other curved surface T is freely supported in a horizontal direction with the crosshead liner (not shown), while abutting on the flat portion.

And, in order to prevent the position shift of the upper work roll choke, the choke restraint apparatus which elastically supports the upper work roll choke toward the rolling mill housing (30: the conveying direction exit of the to-be-rolled material) on the crosshead liner at the side of the conveyance direction of the rolled material. (Not shown) is provided. In other words, the choke restraint device which elastically supports the upper work roll choke is provided in the crosshead liner at the side of the grain in the conveying direction of the rolled material in the direction in which the upper work roll 1 is offset during rolling the rolled material. This choke restraint device has the same structure as the choke restraint device 18 on the operator side. In addition, the choke restraint apparatus which elastically supports the upper backup roll choke toward the rolling mill housing (30: the conveying direction entrance side of the rolled material) is provided on the crosshead liner on the exit side of the rolled material in order to prevent misalignment of the upper backup roll choke. (Not shown) is provided. This choke restraint device has the same structure as the choke restraint device 22 on the operator side.

According to the second embodiment of the cross-roll rolling mill described above, in addition to the upper and lower work roll chokes 3 and 4, the upper and lower back-up roll chocks 5 and 6 are again roll-rolled by simple means called springs 21 and 25. (For example, by elastically supporting the work roll chocks 3 and 4 in the conveying direction of the rolled material and the back-up roll chocks 5 and 6 in the reverse direction thereof, the clearance of each roll choke 3, 4, 5, 6 is maintained. It is possible to prevent the misalignment of the sheet and to prevent troubles such as meandering, bending and breaking of the rolled material. In addition, by supplying lubricant directly to the sliding portion of the spring holder and the choke liner, the lubricant is not flowed by the coolant such as the roll coolant or the choke coolant, so that a good lubrication state can be maintained, and the cost of maintenance of the spring holder and the liner is maintained. Can be reduced.

Hereinafter, the reason why it is better to elastically support the upper and lower work roll chokes 3 and 4 as well as the upper and lower backup roll chokes 5 and 6 toward the rolling mill housing 30 by the spring 25 will be described in detail.

The upper and lower work roll chocks 3 and 4 or the upper and lower back up roll chocks 5 and 6 are shown in FIG. 4, the upper work roll pivot block liner 10, the cross head liner 13, and the upper back up roll pivot block liner. (12), in the clearance d between the crosshead liner 14, the position shift occurs in the conveying direction or the reverse direction of the rolled material, and the upper work roll 1 and the upper backup roll 2 or the lower work roll 1 ) And the parallelism between the lower back-up roll 2 may collapse, and the upper work roll 1 and the upper back-up roll 2 or the lower work roll 1 and the lower back-up roll 2 may cross slightly. The cross angle of the upper work roll 1 and the upper backup roll 2 is called a roll cross angle. Or the cross angle of the lower work roll 1 and the lower back up roll 2 is called roll cross angle. When this roll cross angle generate | occur | produces, the force (called thrust force) which tries to shift | deviate in the axial direction between the upper and lower work rolls 1 and the upper and lower back up rolls 2 arises.

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 fair-cross rolling machine, it is normal that the work roll 1 and the backup roll 2 are in a positional relationship in which their respective central axes are in parallel, but referring to FIG. It can be seen that the thrust coefficient greatly changes due to the change in the cross angle. Therefore, when a roll cross angle is slightly large, a large thrust force may generate | occur | produce.

As shown in FIG. 4, the rolling mill has a clearance d between each roll choke 3, 4, 5, 6 and the pivot block liner or cross head liner 10, 13, 12, 14 and the roll cross angle. This can fluctuate. The change of the roll cross angle by this clearance (d) is not normally controllable. For example, in the examples of the rolling mills shown in Figs. 1A, 1B, and Figs. 14A and 14B of the conventional example, a roll cross angle of 0.04 ° at maximum occurs during rolling.

5 shows the relationship between the roll cross angle, the load difference and the thrust force when the lower work roll 1 and the lower back up roll 2 cross each other. Here, the "load difference" refers to a difference obtained by subtracting the load on the drive side from the load on the operator 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, this thrust force changes the load difference on the operator side and drive side for balancing the moment which the rolls 1 and 2 try to rotate in the front view of a rolling mill. As shown in FIG. 5, when the thrust force is 1200 kN, the load difference varies by 600 kN. If the load difference is 600 kN, and the spring constant in the vertical direction of the rolling mill housing is 15000 kN / mm, the elongation difference in the vertical direction (the direction in which the rolling load acts) on the operator side and the drive side is about 40 μm (= 600 / 15000 × 1000). Then, as shown in FIG. 6, even if the to-be-rolled material S rolls and the to-be-rolled material S passed through the center of the width direction of the upper and lower work rolls 1, the upper and lower parts of the drive side for compensation of a load difference are shown. The opening degree of the work roll 1 should be compressed by the equivalent of 40 micrometers.

Normally, when the operator is rolling the rolled material, the operator changes the load difference when rolling the next rolled material and starts rolling the next rolled material, and then leveling to zero it (operator side of the upper and lower work rolls). And drive opening difference). However, the positional shift of the conveyance direction of the to-be-rolled material of the work roll chocks 3 and 4 and the backup roll chocks 5 and 6 like the cross-roll rolling machine arises for the reason mentioned above, and the roll cross angle which arises by it is In a state in which a load difference occurs due to the thrust force accompanying, the leveling value to be taken also changes only for the load difference due to the thrust force. In addition, among the above-mentioned clearances d, the positions of the work roll chocks 3 and 4 and the backup roll chocks 5 and 6 are not constant and can fluctuate. In this way, when the positions of the work roll chocks 3 and 4 and the backup roll chocks 5 and 6 fluctuate within the clearance d, when the rolled material having the same cross angle θ and the same dimension is rolled under the same conditions, In addition, the reproducibility of the leveling value to which the thrust force and the load difference should be taken is already lost. Even if rolling is continued in this state, bending and meandering generate | occur | produce in a to-be-rolled material, and especially in the case of rolling interrupted between hot rolling etc., it becomes a cause of the end drawing of a to-be-rolled material worse.

In addition to the upper and lower work roll chokes 3 and 4, the upper and lower back up roll chokes 5 and 6 also support the roll chocks 3, 4, 5 and 6 by elastically supporting the rolling mill housing 30 with the springs 25. It is more preferable to prevent the position shift within the clearance (d) of. The occurrence of cross angle (roll cross angle) between the upper and lower work rolls 1 and the upper and lower back up rolls 2 is suppressed to the maximum, and the occurrence of the thrust force is suppressed to the maximum, and troubles such as meandering, bending and breaking of the rolled material are prevented. Can be prevented even more effectively.

Next, with reference to FIGS. 1A and 2A, the mounting and removal of the work roll 1 and the backup roll 2 into the rolling mill will be described.

The work roll 1 and the backup roll 2 are attached or removed in a direction perpendicular to the ground in FIGS. 1A and 2A. When the work roll 1 and the backup roll 2 are mounted or removed, the cross head 8 is screw 15 in the screw 15 and the nut 16 which are screwed together to prevent machine interference. By rotating the side, it is opened so that it is 2 to 5 mm apart from the chokes 4 and 6.

And after attaching the work roll 1 and the backup roll 2, the cross head 8 is closed and the clearance of the spring holder 19 and the choke liner 17, the spring holder 23, and the choke liner 26 is carried out. Is set to be 0 mm. The gap between the spring holder 19 and the thin liner 20 and the spring holder 23 and the thin liner 24 is such that when the rolling load is applied, the rolling mill housing 30 is narrow as shown in FIG. 17B. In consideration of shrinkage in the losing direction, 1.0 mm to 2.0 mm are formed. When a compressive load is applied, this gap becomes small in accordance with the shrinkage of the rolling mill housing 30, and the springs 21 and 25 are compressed between the roll chocks 4 and 6. As shown in FIG. As a force acting on the springs 21 and 25 in this compressed state, 200-300 kN per choke is preferable. If it is less than 200 kN, the force for elastically supporting the roll chocks 4 and 6 toward the rolling mill housing 30 is not sufficient, and if it exceeds 300 kN, it is unreasonable to the rotation of the unshown bearing in the roll chocks 4 and 6. This is because there is a risk of being damaged.

Lubrication is important to fully exhibit the function of the choke restraint device 18 according to the present invention. The part to lubricate is between the spring holder 19 and the choke liner 17, and between the crosshead 8 and the crosshead liner 13. In particular, it is important to supply lubricant to the surface on which the crosshead 8 and the crosshead liner 13 slide each other with curved surface sliding surfaces.

On the other hand, in both the first embodiment and the second embodiment, only the choke of either of the operator side or the drive side is shown for the cross rolling mill moving toward the inlet and outlet side of the material to be rolled, but the rotation at the change of the cross angle is shown. The pivot blocks 9 and 11 which are the center are fixed to the rolling mill housing 30, and when the work roll 1 and the backup roll 2 are mounted and removed into the rolling mill like the cross head 8, It is impossible to open the gap. Therefore, each gap between the spring holders on the side of the pivot block 9 and 11 and the choke liners on the side of the roll chocks 3 and 5 prevents the installation and removal of the work roll 1 and the backup roll 2 into the rolling mill. In order to prevent the interference with each roll choke 3 and 5 at the time of carrying out, it is good to make a slight gap generate | occur | produce in the state in which rolling load does not apply. As for this clearance, 0.2-1.0 mm is preferable. If the thickness is less than 0.2 mm, the work roll 1 and the back-up roll 2 may interfere with mounting and removal in the rolling mill. If the thickness exceeds 1.0 mm, the rolling mill acts as a rolling mill housing 30. This is because the spring holder does not reach the choke liners of the respective roll chokes 3 and 5 even if it contracts, and there is a risk that the elastic bearing force may not act. In both the first embodiment and the second embodiment, this gap is set to 0.4 mm.

Example

The first to seventh stands F1 to F7 of the finish rolling mill 46 of the hot rolling line 40 shown in FIG. 7 are shown in FIGS. 1A and 1B of the present invention. In the case of rolling by applying only the choke restraint device) and the case of rolling by applying the conventional fair-cross rolling mill shown in Figs. 16A and 16B, the position shift amount of the lower work roll choke was compared and evaluated. In the hot rolling line 40 shown in Fig. 7, reference numeral 41 denotes a heating furnace, reference numeral 42 denotes a sizing press, reference numeral 43 denotes a rough rolling mill, reference numeral 44 denotes a crop shear, reference numeral 45 denotes a descaling apparatus, and a drawing. Reference numeral 47 denotes a cooling zone, and reference numeral 48 denotes a winding device.

FIG. 8: shows the relationship between the rolling load in the 4th stand F4, and the position shift amount (the conveyance direction entry side) of the lower work roll choke by the operator side used as the crosshead side. On the other hand, the work roll diameter of the fourth stand in this embodiment is about 630 mm, the backup roll diameter is about 1550 mm, the cross angle is 0.02 to 1.04 °, and the rolling speed is 350 to 550 mpm.

Referring to Fig. 8, before installation of the choke restraint device, i.e., when a conventional faircross rolling mill is applied, the lower work roll choke 104 in the rolling mill housing 100 is 1.2 mm at maximum in the conveying direction of the rolled material during rolling. It is causing positional deviation. On the other hand, after installation of the choke restraint device, ie, when the fair cross rolling machine shown in FIGS. 1A and 1B of the present invention was applied, the position shift of the lower work roll choke 4 was 0.1 mm or less regardless of the rolling load. It can be seen that the position shift of the lower work roll choke 4 can be prevented.

On the other hand, as shown in FIG. 10, the position of the lower work roll chocks 4 and 104 embeds the vortex type distance sensor 50 in the thin liner 20, and this vortex type distance sensor 50 and the lower workpiece | work It calculated | required by measuring the distance with roll chocks (4, 104). The signal output by the vortex type distance sensor 50 enters the amplifier 51, and the output of the amplifier 51 can always monitor the movement of the lower work roll chokes 4 and 104.

Next, the fair-cross rolling mill (work roll choke) shown in FIGS. 1A and 1B of the present invention is elastically mounted on the first to seventh stands F1 to F7 of the finish rolling mill 46 of the hot rolling line 40 shown in FIG. 7. When only the choke restrainer supporting is installed) and the fair cross rolling machine shown in FIGS. 2A and 2B is rolled by applying the choke restraint for elastically supporting the workroll choke and the choke restraint for elastically supporting the backup roll choke. And the variation of the load difference were compared and examined in the case of rolling by applying the conventional fair-cross rolling mill shown in Figs. 16A and 16B.

9 shows the relationship between the rolling load and the load difference during the actual hot rolling operation in the fourth stand F4. When no choke restraint device was installed, that is, when the conventional fair-cross rolling mill shown in Figs. 16A and 16B was applied, the variation in the load difference was found to be close to 600 kN. On the other hand, when the choke restraint device which elastically supports the work roll choke is provided, that is, when the fair-cross rolling machine shown in FIGS. 1A and 1B of the present invention is applied, the variation in the load difference is reduced to 400 kN. In addition, when the choke restraint device which elastically supports a work roll choke and the choke restraint device which elastically supports a backup roll choke are installed simultaneously, ie, when the fair-cross rolling machine shown to FIG. 2A, 2B of this invention is applied, a load difference The deviation of was further reduced to 150 kN or less.

As mentioned above, although the case where this invention was applied to the hot rolling line was demonstrated as an example, this invention is applicable also to the finishing rolling mill 66 of the cold rolling line 60 shown, for example in FIG. In Fig. 11, reference numeral 61 denotes an entrance looper, 62, 65, 67 denotes a bridle roll, 63 denotes a welding machine, 64 denotes a payoff reel, 68 denotes a sheer, and 69 denotes a carousel. It is a tension reel. Moreover, this invention is applicable also to the fair cross rolling machine of both crosses other than a single cross, and a work roll single cross rolling machine.

As described above, according to the rolling method using the cross roll rolling mill and the cross roll rolling mill according to the present invention, the work roll choke is elastically supported in the roll offset direction by a simple means such as a spring, so that Position shift can be prevented, and troubles such as meandering, bending and breaking of the rolled material can be prevented.

In addition to the work roll choke, the backup roll choke is further elastically supported in the roll offset direction by a simple means such as a spring, thereby preventing misalignment within the clearance of each roll choke, and the cross angle between the work roll and the backup roll. The occurrence of (roll cross angle) can be suppressed to the maximum, and the occurrence of thrust force can be suppressed to the maximum, whereby troubles such as meandering, bending and breaking of the rolled material can be prevented more effectively.

In addition, by using the spring as a means for elastically supporting the work roll choke or the backup roll, it is possible to avoid the difficulty of installing a hydraulic cylinder or a hydraulic pipe in a narrow space that does not interfere with the rolling mill housing or each roll choke. It is a low cost and reliable device. In addition, by supplying lubricant directly to the sliding part of the spring holder and the choke liner, the lubricant is not flowed by the coolant such as the roll coolant or the choke coolant, so that a good lubrication state can be maintained and the cost of maintenance of the spring holder and the liner is maintained. Can be reduced.

Claims (6)

In a cross-roll rolling mill having a work roll choke for rotatably supporting a work roll and a backup roll choke for rotatably supporting a backup roll, the work roll choke in a direction in which the work roll offsets the rolled material during rolling. Cross rolling mill, characterized in that the spring is formed to elastically support the. The cross roll rolling mill according to claim 1, further comprising a spring for elastically supporting said backup roll choke in a direction in which said backup roll offsets said rolled material during rolling. The cross-roll rolling mill according to claim 1 or 2, wherein a lubricant is supplied between the spring holder and the choke liner and between the cross head and the cross head liner. In the rolling method using the cross-roll rolling mill provided with the work roll choke which rotatably supports a work roll, and the backup roll choke which rotatably supports a backup roll, The said work roll choke is rolled at the time of rolling of a to-be-rolled material. Rolling method using a cross-roll rolling mill characterized by rolling while elastically supporting with a spring in a direction in which the work roll is offset. 5. The rolling method according to claim 4, wherein, in the rolling of the rolled material, the backup roll choke is rolled while elastically supporting with a spring in a direction in which the backup roll is offset during rolling. The rolling method according to claim 4 or 5, wherein lubricant is supplied between the spring holder and the choke liner and between the crosshead and the crosshead liner.