JP2003071507A - Rolling roll with variable width and method for rolling section steel therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling roll with a variable width and a method for rolling a section steel therefor capable of enlarging the manufacturing scope and at the same time, capable of improving the dimensional accuracy and of enabling strong draft rolling. SOLUTION: A roll barrel is divided into two sides; the driving side and the operation side and, so that the relative displacement, wherein the divided two roll barrels approach or retire each other along the roll shaft direction, is feasible in a state when it is incorporated into the stand, the rolling roll with the variable width has a structure supported via bearings by each roll chock of the driving side and the operation side and in the rolling roll with the variable width where a movable mechanism to adjust the roll width of divided roll barrels is provided, the rolling roll with the variable width is provided with an interval holding member between divided roll barrels and the section steel therefor is rolled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable width rolling roll for manufacturing a shaped steel and a method for rolling a shaped steel using the same, and more particularly to a roll width by changing a roll body length in an online state incorporated in a stand. The present invention relates to a variable width rolling roll capable of changing the width and a method of rolling shaped steel using the same.

[0002]

2. Description of the Related Art For rolling H-shaped steel among shaped steels, a universal rolling machine is generally used in which a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls are incorporated in the same stand. In such a universal rolling mill, as shown in FIG. 1, the flange width B of the H-section steel 37 is such that the vertical roll 7,
The size can be freely changed within the range of the roll cylinder length of 7 ', but the web height h is h = W + 2 · t _f, that is, the flange thickness t _f and the roll cylinder length of the horizontal rolls 38, 38'. Since it is determined by a certain roll width W, when the roll width W is fixed, there were the following problems in the production of the H-section steel.

In the so-called external constant H-section steel in which the web height (web outer width) h of the H-section steel is constant, there are many types of flange thickness t _f even with the same nominal size, for example, H600 ×
In the range of 200, t _f = 12 to 28 mm, and when the roll width W of the horizontal roll is fixed, in order to manufacture the outer constant H-section steel having a wide range of the flange thickness t _f ,
In order to appropriately change the roll width W according to the flange thickness t _f , it is necessary to frequently change rolls, which hinders productivity and requires a large number of replacement steps and a large number of rolls. However, there is a problem that the manufacturing cost of the H-section steel with a fixed outer method increases.

Therefore, for example, as a rolling roll whose roll width can be changed, Japanese Patent Application Laid-Open No. 61-169105 discloses a rolling roll shown in FIG. However, in this variable width rolling roll, although the spacer 41 is inserted between the sleeve rolls 39 to adjust the roll width W,
The roll width cannot be changed in the online state when installed in the stand.When changing the roll width, it is necessary to take out the rolling roll from the stand and change the roll width in the offline state. It was not possible to solve the problem of requiring a lot of disassembly and assembly man-hours.

Variable width rolling rolls have been developed and are in use that solve these problems and allow the roll width to be changed online. For example, Japanese Patent Laid-Open No. 4-100608 discloses an online variable width rolling roll as shown in FIGS. FIG. 4 shows the variable width rolling roll on the upper side of FIG. 3, and the variable width rolling roll on the lower side of FIG. 3 has the same structure as the upper side.

In the universal rolling mill shown in FIG. 3,
Reference numerals 2 and 2 ′ are variable width rolling rolls, and the variable width rolling rolls 2 and 2 ′ are supported by the drive side roll chocks 3 and 3 ′ and the operation side roll chocks 4 and 4 ′ through bearings and the housing. Built into. Spindle couplings 5 and 5'are attached to the drive side shaft ends of the variable width rolling rolls 2 and 2 ', and the variable width rolling rolls 2 and 5'are attached via the spindle couplings 5 and 5'by a driving device (not shown). 2'can be driven. 8, 8 '
Is a vertical roll chock, vertical roll 7,7 '
Are supported via bearings.

As shown in FIG. 4, the shaft structure of the variable width rolling roll has the operation side roll shaft 1 of the operation side roll cylinder 10B.
1B hollow part 1D drive roll shaft 1 of drive roll body 10A
1A is penetrated and fitted so that it can be inserted / removed in the roll axial direction and can be rotated synchronously. In the figure, 30 is the rolling torque from the drive side roll shaft 11A to the operation side roll shaft 1A.
1B is a sliding key, and a metal (not shown) is interposed between the operation side roll shaft 11B and the drive side roll shaft 11A at the position where the bearing 13 is arranged, and the metal is provided in the vertical direction. It is designed to withstand the load. With this metal and the sliding key 30, the load in the vertical direction can be counteracted, the roll shaft can be inserted and removed, and the rotation can be synchronized. In the moving mechanism boxes 9 and 9 ', a moving mechanism for changing the roll width W is provided.

Reference numeral 20 in FIG. 4 denotes a scale seal, which is a drive side roll cylinder 10A and an operation side roll cylinder 10
The scale is prevented from entering between the roll shafts 11A and 11B through a gap formed with B.

[0009]

The on-line variable width rolling roll having the above-mentioned shaft structure has the following points to be improved. (I) A lateral load is applied to the side surface of the variable width rolling roll during rolling, and as shown in FIG. 5, a bending moment M is generated in the roll cylinders 10A and 10B due to the lateral load. . When the thickness of each roll cylinder 10A, 10B is thin, the bending moment M causes the roll shafts 11A, 11B to move.
The stress at the corners of the roll shaft exceeds the allowable value and the roll shaft 11
Cracks are generated at the corners of A and 11B, and the cracks are propagated by the lateral load repeatedly applied to cause roll fracture. For this reason, a variable width rolling roll for rolling the outer constant H-shaped steel having a small web height cannot be realized, and the manufacturable range of the variable width rolling roll is limited.

(Ii) The load from the lateral direction is further increased, and it is difficult to perform strong reduction rolling.
H of size that stress at corners of A and 11B exceeds allowable value
The shaped steel had to be rolled using an integral roll. (Iii) There has been a demand to further improve the web height accuracy of H-section steel products with a fixed outer method.

An object of the present invention is to eliminate the above-mentioned problems of the prior art, and it is possible to expand the manufacturable range, improve the dimensional accuracy, and perform strong reduction rolling. It is to provide a variable width rolling roll and a method for rolling shaped steel using the rolling roll.

[0012]

DISCLOSURE OF THE INVENTION The inventors of the present invention have made diligent studies and arranged a space holding member (spacer) between roll cylinders divided into two to increase bending rigidity against a lateral load. As a result, the inventors have found that the above problems can be solved and completed the present invention. In the variable width rolling roll of the present invention, the roll cylinder is divided into a driving side and an operating side, and the two divided roll cylinders are installed in the stand for relative movement to approach and separate from each other along the roll axial direction. A variable width rolling roll having a structure in which it is supported on each of the driving side and operating side roll chocks via bearings so as to be possible, and provided with a moving mechanism for adjusting the roll width of the roll cylinder divided into two parts. In the above, the space holding member is arranged between the two divided roll cylinders. At this time, it is preferable that the spacing member is composed of an integral ring-shaped base liner and at least a pair of half-ring shaped half liners.

Further, the method for rolling shaped steel according to the present invention uses the variable width rolling roll according to claim 1 or 2, and a gap formed according to the roll width is formed between the two roll cylinders. Place a spacing member with the same spacing as the spacing, during rolling,
It is characterized in that the shaped steel is rolled while maintaining the interval of the gap against the rolling load applied by the interval maintaining member. At that time, the spacing member is composed of an integral ring-shaped base liner and at least a pair of half-ring shaped half liners, and the integral ring-shaped base liner is mounted at the time of roll assembly, and the at least one pair of half-ring shaped half liners. The liner is preferably attached and detached online and rolled.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The variable width rolling roll of the present invention has two
The structure can be the same as that of the conventional online variable width rolling roll except that a spacing member, that is, a member called a spacer is arranged between the divided roll cylinders. Hereinafter, a case where the present invention is applied to the online variable width rolling roll shown in FIG. 4 will be described in detail.

FIG. 6A is a sectional view showing an example of an online variable width rolling roll according to the present invention, and FIG.
[Fig. 4] is a partial front view thereof. FIG. 6A shows a conventional online variable width rolling roll shown in FIG. 4, in which a spacing member, a so-called spacer 21, is arranged between the two divided roll cylinders 10A and 10B. Spacer 2
The member 1 may be any member that can maintain the space S between the two divided roll cylinders 10A and 10B. For example, as shown in FIGS. 6B and 7, the spacer 21 has liners 21A, 21B and 21B 'having appropriate thicknesses.
Can be Liners 21A and 21B in this case
The shapes of and 21B 'are shown in FIG.

The base liner 21A is in the form of an integral ring having a uniform thickness in the circumferential direction, and has a pair of half liners 2.
1B and 21B 'are semi-ring shapes having a uniform thickness in the circumferential direction, and are combination half rings that become closed rings when combined. Integrated ring-shaped base liner 21
A is the drive-side roll shaft 11 when the variable width rolling roll is assembled.
A or through the roll shaft 11B on the operating side,
Attach between A and 10B. That is, the integrated ring-shaped base liner 21A is a spacing member that is mounted in an off-line state, and is a spacing member that maintains the gap between the roll cylinders 10A and 10B at the minimum spacing S ₀ .

The other pair of half-ring-shaped half liners 21B and 21B 'are in the on-line state in which the variable width rolling rolls are incorporated in the housing, and the roll cylinders 10A and 10B.
It is a space holding member that is detachable between the roll cylinders 10A and 10B and holds the space between the roll cylinders 10A and 10B at a space S _{equal to} or greater than the minimum space S ₀ . The liner attachment jig 23 has a plurality of pins along the circumferential direction, and the through-holes of the integrated ring-shaped liner 21A and the pair of half-ring-shaped half liners 21B and 21B 'provided corresponding to the pins. By inserting the above pins into the liner 22, liners 21A, 21B and 21
B'is for surely set between the roll cylinders 10A, 10B, and is attached to the end surfaces of the roll cylinders 10A, 10B that face each other with a gap therebetween before the variable width rolling roll is assembled.

In this case, as shown in FIG. 6 (b), the thickness of the half ring-shaped half liners 21B and 21B 'is made smaller than the thickness S ₀ of the integrated ring-shaped base liner 21A, and they are used by stacking. However, there is no problem even if the thickness is increased, and the thickness can be set to an appropriate thickness corresponding to the interval S of the gap formed according to the roll width W. In addition, the integrated ring-shaped base liner 21A and the half-ring-shaped half liner 21
The inner diameters of B and 21B 'may be larger than the inner diameter of the roll, their outer diameter may be smaller than the outer diameter D of the roll, and the width and material may be set to appropriate values. The roll inner diameter is a value obtained by subtracting twice the radial thickness of the roll cylinder from the roll outer diameter D. Outer diameter D of each of the roll cylinders 10A and 10B
And the radial thickness is the same.

Since the integrated ring-shaped base liner 21A and the semi-ring-shaped half liners 21B and 21B 'receive the rolling load from the lateral direction as a compressive load via the roll cylinders 10A and 10B, the rolling from the lateral direction is performed. It is desirable that the outer diameters of the rollers be slightly smaller than the outer diameter D of the roll from the viewpoint of yielding load-bearing performance that does not cause plastic deformation by yielding, and suppressing the bending moment. Of course, allow for roll grinding allowance.

When H-section steel is rolled by such variable width rolling rolls, the variable width rolling rolls 2'on the lower side of the universal rolling mill shown in FIG. Just place it. In the rolling method of H-section steel using such a universal rolling mill, the spacing member having the same spacing as the spacing S of the spacing formed according to the roll width W is described above between the two divided roll cylinders. As described above (see FIG. 6 (b)), during rolling, the shaped steel is rolled while maintaining the gap spacing S against the rolling load applied by the spacing member. In this case, since the spacer 21, which is a space holding member having the same space as the space S between the spaces, is arranged between the roll cylinders 10A and 10B divided into two parts.
As shown in, the vertical rolls 7 and 7'and the roll cylinder 10A,
The material 1 to be rolled is rolled between 10B to roll cylinder 10A,
A rolling load from the lateral direction acts on 10B, but since the bending moment resulting from the rolling load from the lateral direction can be relaxed, the bending stress at the corners of the roll shafts 11A and 11B can be significantly reduced. You can do it.

Therefore, even when each width of the roll cylinder is narrowed, the bending stress in the narrow width portion of the roll cylinder and the roll shaft fitted with the roll cylinder can be suppressed to be equal to or less than the crack generation stress, and the web height can be reduced. It is possible to realize a variable-width rolling roll for rolling a constant outer-method H-shaped steel having a small size. Further, in a conventional variable width rolling roll having a wide width of each roll cylinder, even when the H-section steel flange is strongly pressed,
Since it is possible to oppose by the compressive load of the spacer 21 which is the spacing member via the roll cylinder, it is possible to suppress the bending stress in the narrow width part of the roll cylinder and the roll shaft fitted with it to below the crack generation stress. It is possible to further increase the rolling load acting on the roll cylinder in the lateral direction.

Furthermore, since the bending rigidity against the rolling load from the lateral direction can be increased, the dimensional accuracy of the outer constant H-section steel can be improved. In the online variable width rolling roll of the example according to the present invention described above, a liner having a uniform thickness in the circumferential direction and being continuous in the circumferential direction is used as the spacing member. The interval holding member used in (1) is not limited to this, and it is also possible to dispose the interval holding member in a discrete manner at appropriate intervals in the circumferential direction so that the interval holding member is not continuous in the circumferential direction. Alternatively, a so-called threaded ring, which is assembled as shown in FIG. 9, can be applied to hold a gap, in which a pair of rings facing each other are threaded on the outer side and the inner side on the other side. When one ring is fixed and the other is rotated, S
Can be changed. Various methods can be used for turning.For example, you can make a hole in the outer peripheral surface of the outer ring by turning it around by sticking a stick in it, or by turning the outer peripheral surface of the outer ring with a screw in the circumferential direction. There is a way to turn.

This method has a problem in the strength of joints in the case of a half ring, so it is desirable to use a ring type and always arrange between rolls. Among such spacing members, the spacing member is composed of the above-mentioned integral ring-shaped base liner and a pair of half-ring shaped half liners, and the integral ring-shaped base liner has a thickness that minimizes the gap between the roll cylinders. the same city as the spacing S _0, it is mounted at the roll assembly, a pair of half-ring-shaped half-liner, spacing S is the minimum spacing S of the gap formed in accordance with the thickness in the roll width
_{When it is 0} or more, it is preferable to set the same as the interval exceeding the minimum interval S ₀ and to attach and detach in an online state, because the structure is simple and the rigidity can be uniformly increased in the circumferential direction.

By the way, the moving mechanism housed in the moving mechanism boxes 9 and 9'is arranged so that the roll width of the roll cylinder divided into two parts can be adjusted.
As described in Japanese Patent No. 0608, it is possible to provide an electric motor with a speed reducer and rotate the width adjusting screw described below. That is, on the operation-side shaft end of the operation-side roll shaft, an operation-side slide block that is restricted in rotation and is only slidable in the roll-axis direction is mounted via a thrust bearing, while the operation-side end of the drive-side roll shaft is mounted. The push-in shaft is arranged adjacent to the drive-side slide block, and the drive-side slide block that is restricted in rotation to the push-in shaft and can slide only in the roll axis direction is mounted through the thrust bearing. In this structure, a female screw and a male screw having different winding directions are provided respectively, and the width adjusting screw is provided with a screw for screwing with each of these screws.

In the above description, the variable width rolling roll is applied to the rolling of H-section steel, but the variable width rolling roll of the present invention can be applied to the rolling of shaped steels other than H-section steel.

[0026]

Example 1 For rolling H-section steel having a web height of less than 350 mm, the roll width is 314 mm when the gap between the roll cylinders is the minimum interval S ₀ 15 mm,
Two new variable-width rolling rolls having a maximum gap of 50 mm were manufactured, and incorporated into a stand of a universal rolling mill to carry out rolling of a constant external H-section steel.

At this time, when assembling the variable width rolling roll, an integral ring-shaped base liner having a thickness of the minimum interval S ₀ is mounted between the two divided roll cylinders, and when the roll is on-line, the roll width is changed according to the roll width. A semi-ring-shaped half liner having a thickness corresponding to the spacing S of the gap formed by attaching / detaching is installed between the two divided roll cylinders, and at the time of rolling, the gap is resisted against the rolling load applied by this spacing member. Hold the interval. The semi-ring shaped half liner has an outer diameter of 1300 mm,
It was made of steel with a width of 96 mm and a thickness of 0.1 mm, and the integral ring-shaped base liner was the same as the half-ring shaped half liner except that the thickness was set to the minimum interval S ₀ .

As a result, there is no breakage or cracking in the variable width rolling rolls, and it is possible to roll the outer constant H-section steel having a small web height of less than 350 mm, and to obtain the web height of the obtained product. The accuracy was good. (Example 2) For rolling H-section steel having a web height of H600 mm or more, the roll width is 551 mm and the maximum gap is 100 mm when the gap between the roll cylinders is the minimum gap S ₀ 20 mm. The two variable width rolling rolls which were used in the past were used and incorporated in the stand of the universal rolling mill to roll the H-shaped steel with protrusions.

At that time, in rolling the H-section steel of a predetermined size, it was expected that the vertical rolling load would be 1.1 times the allowable vertical rolling load of the variable width rolling rolls conventionally used. At the time of assembling the rolling roll, an integral ring-shaped base liner having a thickness of the minimum distance S ₀ is mounted between the two divided roll cylinders, and when in an online state, a gap distance S formed according to the roll width. The semi-ring-shaped half liner having a thickness corresponding to (1) was attached / detached between the two divided roll cylinders, and at the time of rolling, the gap spacing was maintained against the rolling load applied by this spacing member. The semi-ring shaped half liner has an outer diameter of 1300 mm and a width of 96 mm,
It was made of steel having a thickness of 0.1 mm, and the integral ring-shaped base liner was the same as the half-ring shaped half liner except that the thickness was set to the minimum interval S ₀ .

As a result, the variable width rolling roll of the invention example was free from breakage and cracks, and it was possible to roll the H-section steel with projection having a larger vertical rolling load than the conventionally used variable width rolling roll. The web height accuracy of the obtained product was good. (Embodiment 3) H having a web height of 600 mm or more
The minimum gap between the roll cylinders for rolling the section steel is S ₀ 20
Roll width is 757 mm when mm is 100 mm, and the maximum gap is 100 mm. Two conventionally used variable-width rolling rolls are installed in a stand of a universal rolling mill to perform rolling of a constant external H-section steel. It was At that time, the rolling schedule is set to the same horizontal rolling load and the same vertical rolling load as in the conventional case, and as in the second embodiment, the same gap interval is formed between the two divided roll cylinders according to the roll width. The interval maintaining members were arranged to maintain the intervals of the spaces against the rolling load applied by the interval maintaining members during rolling.

The half ring-shaped half liner and the integral ring-shaped base liner were the same as in Example 2. as a result,
The variable width rolling roll of the invention example had no breakage or cracks, and the web height accuracy of the product rolled by this roll was better than that of the product rolled by the conventional variable width rolling roll.

[0032]

According to the variable width rolling roll of the present invention, it is possible to increase the roll strength against a load from the lateral direction, and it is possible to change the width of a rolling roll having a small web height, which has been difficult to apply in the past. Can be Further, according to the variable width rolling roll of the present invention, since it is possible to increase the bending rigidity against a load from the lateral direction, it is possible to perform strong reduction rolling and improve the dimensional accuracy of the shaped steel. . For example, the web height accuracy of H-section steel can be improved.

As a result, when applied to the rolling of H-section steel,
The manufacturable range of the outer constant rolling H-section steel can be expanded, and the roll unit consumption can be significantly reduced, and the outer constant rolling H-section steel can be economically manufactured. .

[Brief description of drawings]

FIG. 1 is an explanatory diagram of H-shaped steel rolling in a universal rolling mill.

FIG. 2 is an explanatory view showing an internal structure of a conventional off-line variable width rolling roll.

FIG. 3 is a front view showing a main part of a universal rolling mill including a conventional online variable width rolling roll.

FIG. 4 is a sectional view of an essential part showing the internal structure of a conventional online variable width rolling roll.

FIG. 5 is an explanatory view of the operation of a conventional online variable width rolling roll.

FIG. 6 (a) is a cross-sectional view of an essential part showing an example of an online variable width rolling roll according to the present invention, and FIG. 6 (b) is a partial front view thereof.

FIG. 7 is a component diagram of a spacing member (spacer) suitable for use in the present invention.

FIG. 8 is an explanatory view of the action of the online variable width rolling roll according to the present invention.

FIG. 9 is a cross-sectional view when a suitable screw ring is applied to the present invention for spacing.

[Explanation of symbols]

1 H-section steel (rolled material) 2, 2'width variable rolling roll 3,3 'Drive side roll chock 4, 4'Operation side roll chock 5, 5'spindle coupling 7,7 'vertical roll 8,8 'Vertical roll chock 9, 9'movement mechanism box 10A Drive side roll cylinder 10B Operation side roll cylinder 11A Drive-side roll shaft 11B Operation-side roll shaft 11A 'Operation side end of drive side roll shaft 12, 13 bearings 20 scale stickers 21 Spacing member (spacer) 21A Baseliner 21B, 21B 'Half liner 21C Internal ring with screw 21D outer ring with screw 22 Through hole 23 Liner mounting jig 30 keys W roll width (roll body length) h Web height B Flange width Interval of S gap D roll outer diameter 37 H section steel 38, 38 'horizontal roll 39 Sleeve Roll 40 roll axis 41 Spacer 42 bearing

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Claims (4)

[Claims] 1. A roll cylinder is divided into a driving side and an operating side, and the two divided cylinders can be moved relative to each other along the axial direction of the roll in a stand-mounted state. A variable width rolling roll having a structure in which each of the driving side and operating side roll chocks is supported via bearings, and a moving mechanism for adjusting the roll width of the two-divided roll cylinder is provided. A variable width rolling roll, characterized in that a spacing member is arranged between the divided roll cylinders. 2. The variable width rolling roll according to claim 1, wherein the spacing member comprises an integral ring-shaped base liner and at least a pair of half-ring shaped half liners. 3. The variable width rolling roll according to claim 1 is used, and a spacing member having the same spacing as the spacing of the clearance formed according to the roll width is disposed between the two divided roll cylinders. Then, at the time of rolling, the shaped steel is rolled while the spacing of the gap is maintained against the rolling load applied by the spacing member. 4. The spacing member comprises an integral ring-shaped base liner and at least a pair of half-ring shaped half liners, the integral ring-shaped base liner being mounted during roll assembly, and the at least one pair of half rings. The method for rolling shaped steel according to claim 3, wherein the strip half liner is attached and detached in an online state and rolled.