JP4412277B2 - Turning table for thick plate rolling mill - Google Patents

Description

  The present invention relates to a turning table of a thick plate rolling machine that can achieve improvement in productivity of thick plates.

  The thick plate rolling process is generally performed in the following three processes. (1) Forming and rolling process to reduce the slab, which is the raw material, to the required thickness, (2) Widening rolling to reduce the thickness until the product width can be secured by expanding the width of the formed and rolled material. And (3) a finish rolling step of reducing the thickness to the thickness of the product while maintaining the width of the rolled material that has been rolled out, and for this reason, between (1) and (2), and ( Between 2) and (3), the material to be rolled needs to be turned 90 ° in the plane. This 90 ° turning operation is performed by turning tables 2 and 3 as shown in FIG.

  The turning tables 2 and 3 are composed of a plurality of turning rollers 4 composed of 4A and 4B, and these two types of rollers are arranged in a staggered manner. The rotating roller 4A is a roller having a larger diameter on the OP side than the DR side, and the other rotating roller 4B is a roller having a larger diameter on the DR side than the OP side (see FIG. 2). During thick plate rolling, the material to be rolled S can be rotated 90 degrees by the mutual reverse rotation of the adjacent rolling rollers 4A and 4B, and the material to be rolled S can be conveyed by rotation in the same direction.

In FIG. 1B, when the slab is subjected to a plurality of passes of reverse rolling to produce a thick plate, a 90 ° turning operation is performed after the final pass of forming rolling and after the final pass of tenter rolling. Showed that. In FIG. 1B, a indicates the slab length of the thick plate material, and b indicates the slab width. Reference numeral 6 denotes a rolling direction, and 1A denotes an axis of a work roll incorporated in the rolling mill 1.
Thus, in thick plate rolling, two 90 ° turning operations are performed for each thick plate. Therefore, various studies have been made since shortening this time leads to improvement in the productivity of thick plates.

Here, the direction in which the slab is conveyed to the rolling mill 1 is the front surface, and the direction in which the thick plate rolled to the product thickness is conveyed to the next process is the rear surface, with reference to FIG. The turning operation will be specifically described.
The 90 ° turning operation is performed after the material to be rolled S metal-out from the rolling mill 1 is transported in the direction indicated by the arrow 7, reaches a predetermined position on the turning table, and is temporarily stopped. Next, centering by the movable side guide 5 and subsequent reversal conveyance in the direction indicated by the arrow 8 are performed on the material to be rolled S that has been turned in the turning direction indicated by the arrow 9. . Then, the material to be rolled S is metal-in to the rolling mill 1. FIG. 3 shows an operation flow including 90-degree turning operation and centering from metal-out to metal-in.

  Recently, in the case of a rolled material having a large amount of downward warp in thick plate rolling, it has been recognized that the downward warped portion of the material to be rolled S is caught by the large diameter portion of the turning roller during the 90-degree turning operation. As a result, it was found that when the amount of downward warping is large, it takes a turn time and the centering time is extended. Accordingly, it is important to smoothly perform the 90-degree turning operation even for a workpiece to be rolled having a large amount of downward warping in order to improve the productivity of the thick plate.

  For example, Patent Document 1 proposes a thick plate turning method that smoothly and quickly turns. As shown in FIGS. 8 and 9, the rolling method described in Patent Document 1 is a method of placing a thick plate on a rolling table in which rolling rollers that make point contact with the material to be rolled S are arranged, The rotational speed of each roller is controlled so that the angular speed of the roller is substantially constant, or, further, as shown in FIG. 10 before the rotation, each contact point with the thick plate is arranged on a substantially circumference. This is a method of controlling the axial position of the roller. The turning roller 11 has a large-diameter portion profile formed in an arc shape.

Here, in FIGS. 8-10, 12 has shown the contact location of the large diameter part and the to-be-rolled material S. FIG.
JP-A-6-7828

However, in the turning table described in Patent Document 1, it is necessary to control the number of rotations of the roller so that the angular velocity of the thick plate is constant at each contact point for each turning roller 11, or before each turning roller, before turning. Since the shaft is moved in the axial direction, there is a drawback that the turning time is longer than before.
In addition, the turning table described in Patent Document 1 requires a device for controlling the number of rotations for each turning roller, or further requires a roller shift device for each turning roller. There is a disadvantage of not.

  Therefore, in view of the above problem, the present invention effectively prevents the lower warped portion of the material to be rolled from being caught by the large diameter portion of the turning roller during the 90 ° turning operation even in the case of the material to be rolled having a large amount of downward warping. An object is to provide a turning table that can be prevented.

The inventor has intensively studied the shape of a rolling roller that can prevent the lower warped portion of the material to be rolled from being caught, and has come to achieve the present invention.
The present invention comprises rolling rollers having a large-diameter portion and a small-diameter portion continuous in the roller axial direction on a front surface and a rear surface of a thick plate rolling machine arranged in a staggered manner, and a material to be rolled by mutual reversal of adjacent rotating rollers. In the turning table for turning 90 degrees, the large diameter portion of the turning roller is expanded so that the diameter on the central side in the roller axial direction is larger than the diameter on the end side in the roller axial direction. It is a turning table of a plate rolling machine. In that case, it is preferable that the diameter expansion amount on the central side in the roller axial direction at the large diameter portion of the rolling roller is 40 mm or more in diameter with respect to the end in the roller axial direction.

  According to the turning table according to the present invention, even in the case of a material to be rolled with a large amount of downward warping, it is possible to effectively prevent the bent portion of the material to be rolled from being caught by the large diameter portion of the turning roller during the 90 ° turning operation. it can. For this reason, according to this invention, the productivity of a thick board can be improved compared with the conventional turning table.

First, the case where the workpiece S is turned 90 degrees in the turning direction indicated by the arrow 9 on the conventional turning table will be described with reference to FIGS. 7.1 to 7.4.
FIG. 7.1 to FIG. 7.4 are diagrams showing the contact state between the material to be rolled S and the turning roller 4 when the turning proceeds in this order. FIG. 7.1 shows a state immediately after the start of turning, and FIG. 7.2 shows the state where the turning further proceeds, and the one side corner portion P where the downward bending of the material to be rolled S occurs reaches the large diameter portion of the turning roller 4 for the first time. The state in which the lower warped part is caught by the large diameter part of the turning roller 4 is shown.

  FIG. 7.3 shows a state in which the lower warped portion where the rolling is further progressed and the one side corner portion P where the lower warp of the material to be rolled S is ridden on the large diameter portion of the next rolling roller 4 is run. . FIG. 7.4 shows a state before the 90 ° turning operation is finished and the side guide 5 starts to move and is centered by the side guide 5. It is assumed that the material to be rolled S has a downward warp amount “a” at the tip when it is metal-out from the thick plate mill 1 (see FIG. 7.4).

In the conventional turning table, turning rollers 4 having a large diameter portion substantially equal in the roller axial direction are arranged. As shown in FIG. 7.1, the adjacent rolling rollers 4A and 4B are driven by different drive motors M, and the material to be rolled S is rotated in the rolling direction indicated by the arrow 9 by mutual reversal of the adjacent rolling rollers 4A and 4B. It can be made to.
In FIG. 7.1, L indicates the length of the tip portion where the downward warping occurs, and P indicates one side corner portion where the downward warping of the material to be rolled S occurs. Reference numeral 12 denotes a contact portion between the large diameter portion of the rolling roller 4 and the material S to be rolled.

  In this case, during the 90-degree turning operation, the one side corner portion P where the downward warping occurred is caught by the large diameter portion of the turning roller 4, but the other side of the rolling material S where the downward warping occurs. The corner portion may also be caught by the large diameter portion of the turning roller 4 during the 90-degree turning operation, or the lower warped portion may run up. In particular, in the case of the material to be rolled S having a large amount of downward warping a, it takes time to ride the downward warping portion on the rolling roller 4, so that in the conventional turning table, when the downward warping amount a is large, the turning time is long. It will take a long time.

  Further, in the conventional turning table, in the case of the material to be rolled S having a large downward warp amount a, the position of the contact portion 12 between the large diameter portion of the turning roller 4 and the material to be rolled S is the corner portion P of the material to be rolled S. (See Figure 7.2 and Figure 7.3). For this reason, during the 90-degree turning operation, the rotation center of the material to be rolled S occurs at the corner portion P of the material to be rolled S. Therefore, as shown in FIG. A straight line passing through the rotation center of the material S may be shifted to one of the roller axis directions with respect to the table center 13. As a result, in the conventional turning table, when the downward warp amount a is large, the deviation amount δ of the material S to be rolled increases, and centering by the movable side guide 5 is necessarily required, and it takes a long centering time. Become.

The conventional turning table is managed so that the diameter D _a of the large diameter portion of the turning roller 4 in the roller axial direction central portion side ≦ the diameter D _{b in the} roller axial direction end portion side.
Therefore, in the present invention, even in the case of the material to be rolled S having a large amount of downward warping a, it is possible to effectively prevent the lower warped portion of the material to be rolled S from being caught on the large diameter portion of the turning roller during the 90 ° turning operation. as such, the large diameter portion of the turning roller 4, the diameter D _a of the roller axis direction central portion is enlarged to be larger than the diameter D _b of the roller axial end side.

Then, the large diameter portion of the turning roller 4, the first embodiment the diameter D _a of the roller shaft direction central portion side is diametrically enlarged to be larger than the diameter D _b of the roller axial end side The turning table will be described with reference to FIG.
4A and 4B schematically show the configuration of the turning table according to the first embodiment. FIG. 4A is a schematic plan view thereof, and FIG. 4B is a schematic cross-sectional view showing an essential part thereof.

The turning table according to the first embodiment is formed by arranging turning rollers 4 having a taper-shaped large-diameter portion profile. The tapered shape, so that the diameter D _a of the roller axis direction central portion is larger than the diameter D _b of the roller axial end portion side, a profile which gradually diametrically enlarged diameter portion. The action when the 90-degree turning operation is performed on the turning table according to the first embodiment in which such a large-diameter portion profile is formed by arranging the tapered turning rollers 4 will be described with reference to FIGS. 5.1 to 5.4. This will be described below.

FIGS. 5.1 to 5.4 correspond to FIGS. 7.1 to 7.4, respectively, showing the case of the conventional turning table, and show the contact state between the material S to be rolled and the turning roller 4.
In the turning table according to the first embodiment, when the material to be rolled S conveyed on the turning table is placed, as shown in FIG. 5.1, the turning roller 4 is larger than the conventional turning table. The position of the contact portion 12 between the diameter portion and the material S to be rolled approaches the central portion side of the large diameter portion in the roller axial direction (refer to FIG. 7.1 (a) in the conventional case). And, if the amount of diameter expansion on the center side in the roller axial direction of the large-diameter portion of the turning roller is appropriately set, even if the downward warping amount a of the material to be rolled S is large during the 90-degree turning operation, As shown in 5.2 and FIG. 5.3, the lower warped portion of the material to be rolled S is not caught on the large diameter portion of the turning roller, and the lower warped portion is not lifted, so that the turning time can be shortened.

Further, according to the turning table according to the first embodiment, the position of the contact portion 12 between the large diameter portion of the turning roller 4 and the material to be rolled S is near the center of gravity of the material to be rolled S. It receives a driving force from the contact point 12 with the large-diameter portion and turns around the center of gravity of the material S to be rolled.
For this reason, even in the case of the material to be rolled S having a large downward warp amount a, as shown in FIG. 5.4, at the end of the 90 ° rolling operation, the straight line passing through the rotation center of the material to be rolled S and the table center 13 The amount of shift becomes smaller. Therefore, centering by the movable side guide 5 becomes unnecessary, or the centering time by the movable side guide 5 can be shortened.

The turning table according to the present invention exhibits the same operation and effect as a turning table in which a large-diameter profile is replaced with a tapered rolling roller 4 and a large-diameter profile is provided with a step-shaped turning roller. be able to. The stepped shape, a profile diameter D _a of the roller shaft direction central portion side formed by stepwise enlarged diameter portion so as to be larger than the diameter D _b of the end portion side.

The operations and effects of the turning table according to the second embodiment are schematically shown in FIGS. 6.1 to 6.4. Since the operation of the turning table according to the second embodiment is the same as that of the turning table according to the first embodiment, the description thereof is omitted.
Here, in the turning table according to the present invention, the diameter of the large diameter portion of the turning roller 4 is preferably 40 mm or more in diameter relative to the end in the roller axial direction, more preferably. 60 mm or more. This reason is based on the result of investigating the downward warp of the material to be rolled S by the thick plate mill 1 described below.

  That is, when the slab is subjected to reverse rolling of a plurality of passes by the thick plate mill 1 to produce a thick plate, the amount of downward warping of the material to be rolled S is examined after the final pass of the forming rolling and after the final pass of the tenter rolling. As a result, when the amount of downward warp is less than 20 mm, it is 60% of the total number of rolling, and when the amount of downward warping is less than 30 mm, it is 96% of the total number of rolling, while the amount of downward warping exceeds 55 mm. The result that such a thing did not generate | occur | produce in the plate rolling mill 1 was obtained.

From this result, the roller shaft direction central side diameter D _a of the large diameter portion to the diameter D _b of the roller axial end side, in the case of turning table of turning roller 4 which is expanded above 40mm is the number of total turn This is because the 90 degree turning operation can be smoothly performed on the material to be rolled S having a lower warpage amount of less than 20 mm, which occupies 60%.
Further with respect to the roller axis direction central side diameter D _a of the roller axial end side diameter D _b of the large diameter portion, in the case of turning table with turning roller larger diameter than 60mm is 96% relative to the total turning speed It is more preferable because the 90 degree turning operation can be smoothly performed on the material to be rolled S having a downward warpage amount of less than 30 mm. Furthermore, it is preferable to increase the diameter of the large diameter portion on the center side in the roller axis direction, and the diameter D _a of the large diameter portion in the roller axis direction is larger than the diameter D _b on the end side in the roller axis direction by 80 mm. As described above, it is preferable to use a turning table composed of a turning roller of 100 mm or more. The above total number of rolling times means that a single rolled material S undergoes two 90-degree rolling operations (after forming rolling and after tentering rolling), and therefore, the rolled material S for which the amount of downward warping was investigated. When the total number of N is N, 2 × N is given.

The amount of downward warp a is measured by a warp detector on the front turn table 2 at both ends in the transport direction of the material S when the material S is rolled out from the thick plate mill 1. It is the obtained value. According to the result of measuring the amount of downward warp a of the material to be rolled S on the front-side turntable 2, the tip length L where the downward warp occurred was approximately 600 mm.
In the above description, the front-side rolling table 2 is used. However, the diameter of the large-diameter portion on the rear surface side with respect to the plate mill 1 is larger than the diameter on the end portion side in the roller axial direction central portion side. The effect can be exhibited even if the rolling rollers having such a large diameter are arranged in a staggered manner.

  As described above, according to the turning table in which the turning rollers are arranged such that the diameter of the large diameter portion is larger than the diameter of the roller axial direction end portion side than the diameter of the roller axial direction end portion side. Thick plate rolling efficiency can be increased. The turning table according to the present invention is suitable for rolling thick steel plates having a thickness of 4 mm or more, but can also be applied to rolling metal plates other than steel.

  The present invention is applied to the front and rear turn tables 2 and 3 of the thick plate mill 1 shown in FIGS. In this thick plate mill 1, a slab having a predetermined dimension is reverse-rolled to produce a thick plate having a finished thickness = 4 to 300 mm, a width = 1000 to 5350 mm, and a length = 52000 mm or less. The 90 ° turning operation was performed on a steel plate having a predetermined size on the front turn table 2 after the final pass of forming rolling and after the final pass of tenter rolling.

Specifications of the front side turning table 2 Machine length = 7425 mm, machine width = 7620 mm, length of the rotating roller = 7620 mm, pitch a between the rotating rollers = 675 mm
-Before application of the present invention (diameter D _a = 600 mm on the roller axial center side of the large diameter portion of the rolling roller,
The diameter D _b = 600 mm on the end side in the roller axial direction, and the diameter D _c = 550 mm of the small diameter portion of the rotating roller)
-After application of the present invention (diameter D _a = 660 mm in the roller axial direction central portion side of the large diameter portion of the rotating roller, diameter D _b = 600 mm on the roller axial direction end portion side, large diameter portion of the large diameter portion of the rotating roller Shape: Tapered shape, diameter D _c = 550 mm of the small diameter portion of the rotating roller)
In the turning table of the plate rolling machine before application of the present invention, the time from metal out to metal in (including the turn time and centering time) was 15 seconds on average, The time was reduced to 10 seconds on average.

It is explanatory drawing of thick plate rolling. It is a schematic plan view of the turntable by which this invention is implemented. It is an operation | movement flowchart on a turning table. (A) of the turning table which concerns on 1st Embodiment is a schematic plan view, (b) is a schematic sectional drawing which shows the principal part. It is explanatory drawing which shows the effect | action at the time of turning of the turning table which concerns on 1st Embodiment. It is explanatory drawing which shows the effect | action at the time of turning of the turning table which concerns on 1st Embodiment. It is explanatory drawing which shows the effect | action at the time of turning of the turning table which concerns on 1st Embodiment. It is explanatory drawing which shows the effect | action at the time of turning of the turning table which concerns on 1st Embodiment. It is explanatory drawing which shows the effect | action at the time of turning of the turning table which concerns on 2nd Embodiment. It is explanatory drawing which shows the effect | action at the time of turning of the turning table which concerns on 2nd Embodiment. It is explanatory drawing which shows the effect | action at the time of turning of the turning table which concerns on 2nd Embodiment. It is explanatory drawing which shows the effect | action at the time of turning of the turning table which concerns on 2nd Embodiment. It is explanatory drawing which shows the effect | action at the time of turning of the conventional turning table. It is explanatory drawing which shows the effect | action at the time of turning of the conventional turning table. It is explanatory drawing which shows the effect | action at the time of turning of the conventional turning table. It is explanatory drawing which shows the effect | action at the time of turning of the conventional turning table. 10 is a schematic plan view of a turning table described in Patent Document 1. FIG. It is a schematic front view which shows the principal part of FIG. It is a schematic plan view explaining the problem in the turning table of patent document 1.

Explanation of symbols

S Rolled material 1 Thick plate mill 1A Work roll axis 2, 3 Turning table 4 Turning roller (generic name for 4A, 4B)
5 Side guide 6 Rolling direction 7, 8 Conveying direction 9 Rolling direction 10 Rotating direction 11 Rolling roller 12 Contact point between large diameter part and material to be rolled 13 Table center D _a Diameter of roller diameter direction central part side of large diameter part D _b Diameter of roller diameter direction end side of large diameter part D _c Diameter of small diameter part M Drive motor a Downward warp amount L Length of tip part causing downward warp P Corner part δ Deviation amount

Claims (2)

  Rolling rollers having a large diameter portion and a small diameter portion continuous in the axial direction of the roller are arranged in a staggered manner on the front surface and the rear surface of the thick plate rolling mill, and the material to be rolled is rotated 90 degrees by mutual reversal of adjacent rotating rollers. In the rolling table to be made, the large-diameter rolling machine is characterized in that the diameter of the large-diameter portion of the rolling roller is increased so that the diameter on the central side in the roller axial direction is larger than the diameter on the end in the roller axial direction. Turntable.   The plate rolling according to claim 1, wherein the diameter of the large diameter portion of the turning roller is 40 mm or more in diameter relative to the roller axial end portion side. Turning table of the machine.

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