KR810000577B1 - Rolling mill - Google Patents

Abstract

The rolling mill includes working mill(10,11), middle roll(6,7) controlled to move in the direction of roll axis, and reinforcing roll(2,3). As middle roll(6,7) is lifted by balance cylinder(16) in the project block(14) cable to separate main project block and sub-project block, the piece(27) for assembling is able to be inserted to change working mill or middle roll.

Description

Rolling mill

1 is a schematic front view of a rolling mill according to the present invention.

Figure 2 is a partial side view showing in detail the project block portion of the rolling mill according to the present invention.

3 is a view showing a part of the project block as another embodiment of the rolling mill according to the present invention.

4 illustrates a project block portion as yet another embodiment.

5 shows an intermediate roll moving device of the rolling mill according to the present invention.

The present invention has a pair of upper and lower working rolls, middle rolls and reinforcing rolls, and the upper middle roll in the rolling mill which rolls by controlling the middle roll in the direction of the roll axis according to the change of the rolling conditions. It is lifted upward by the balance cylinder device for the upper middle roll installed in the project block, which makes it possible to insert the assembly piece during assembling the working roller and assembling the middle roller. The project block may be divided into a main project block and a sub project block, and a rolling device characterized in that an apparatus for moving the middle roller in the axial direction is installed.

That is, the present invention relates to a five-stage rolling machine having a pair of upper and lower working rolls, a middle roll, and a reinforcing roll, and performing rolling by moving the middle roll in the direction of the roll axis according to the change of rolling conditions. It relates to a rolling mill having a balance cylinder device for moving in the middle and a cylinder device for moving the middle roll in the roll axial direction.

Two major qualities of rolled products are sheet thickness precision and strip flatness (shape).

Among them, the plate thickness precision in the longitudinal direction is rapidly improved by the control of the so-called automatic plate thickness suppressed by the high performance rolling device of the roll gap generated by the change of the rolling load or the control of the strip tension. It's in the stage to be satisfied.

On the other hand, in the plate width direction, there is a problem of precision and shape of the plate thickness in the plate width direction, and both of these are closely related to the state of the raw material, but shape is given priority as an actual problem.

As a result, in order to roll a good shaped product, it is desired that the deformation of the working width of the working roller due to the rolling load is small and the amount can be largely controlled as necessary.

Nevertheless, the conventional four-stage rolling mill was not enough to satisfy the two.

The rolling mill invented in order to break this state has the rolling mill described in Unexamined-Japanese-Patent No. 47-29260.

The outline of this rolling mill is shown in FIG. 1, and intermediate rollers 6 and 7 are installed between the upper and lower working rollers 10 and 11 and the reinforcing rollers 2 and 3. It moves so that it may move up and down in a direction to a reverse direction, and the roll end part can be set according to plate width.

In this way, the work rollers 10 and 11 are cut off from the plate width at the contact of the reinforcing rolls 2 and 3 from the outside, and are not affected by the bending moment, and also the bending of the work rollers ( Bending) effect can be made remarkable.

In this structure, for example, referring to the right side of Fig. 1, the upper working roller achieves its intention, but the contacting part naturally exists with respect to the lower working roller.

However, on the right side of the roller, the load distribution is not small, the bending effect of the contact is small, and the lighting of the phase roller is sufficiently theoretically and experimentally demonstrated.

Therefore, by using this new rolling mill, the plate | board thickness precision and shape of the width direction improved significantly.

In the six-stage rolling mill as described above, unlike the conventional four-stage rolling mill, the intermediate roll is installed, and the mechanism is movable in the axial direction, while the other reinforcing rollers and the small roller have the balance cylinder mechanism and the roll bending mechanism as in the prior art. It is necessary to have the structure, and the structure becomes more complicated than the conventional four-stage rolling mill.

Therefore, it was difficult to provide various mechanisms of the six-stage rolling mill in the conventional project block.

In other words, the project block of the housing of the conventional four-stage rolling mill is an integral block, and a roll bending cylinder device and a back roll balance cylinder device are provided.

Nevertheless, if you try to use this one-piece integrated project block as it is in a six-stage rolling mill with an axial movement of the middle roller, it is almost impossible to make a cylinder hole for a work roller bending, In this case, the width between the replacement rails of the lower shaft part of the project block becomes wider, and the lower middle roll moving cylinder cannot be installed in the project block. It is difficult to install the balance cylinder and the upper middle roll cylinder, and if you try to install it, the window width will be 30-40% wider than the conventional one. There was a drawback that the length between the stands led to undesirable adverse effects in installing the rolling mill.

In addition, in moving the middle roll of the new six-stage rolling mill in the axial direction, a special swivel joint is used to move the roll directly as a cylinder or a screw, and metal chock as in the present invention. It is conceivable to move the roll by moving through the choke by a cylinder or a screw in which the arm part of the arm is mounted in the housing.

However, the method of using a special rotary joint at the end of the roll shaft as described above is a connection for pulling the roll in the axial direction, and simply inserts into or pulls out of the roller as in the conventional spindle coupling. There are many drawbacks, such as uncountable shortcomings, complicated rotational structures, such as the need to rotate and the rotational joints to be inclined to correspond to the roll cap.

It is an object of the present invention to provide a rolling mill which can compact the main surface of a complex metal choke without widening the window and also facilitates roll replacement assembly.

According to the present invention, in the rolling mill which is in direct contact with the rolling mill and in the rolling mill in the middle of the roll and in the roll axial direction in accordance with the change of the rolling conditions, the upper middle roll and the middle cylinder in the roll axial movement are supported. The lower lifting cylinder and the upper reinforcing roll balance cylinder are gathered together in the upper projection to prevent the window width from widening in the main block.The lower projection of the main project block is provided with the lower reinforcing roller balance cylinder and the lower middle roll axial moving cylinder. Work rollers, intermediate rolls, and rails for replacement assembly are installed on the upper part of the lower projections, and sub-project blocks, which are detachably mounted on the main project blocks, are installed between the upper and lower projections for easy machining and maintenance. The project block has a cylinder for crown control Installed.

In addition, the ends of both pistons of the middle roller moving cylinder in the project block or the housing itself installed on both sides of the housing window are connected by movable beams, and the choke attachments with one cylinder and two levers are installed in the beams. This eliminates the above-mentioned drawback of the middle roll moving device by providing a middle roll moving device which can move the middle roll in the axial direction via the choke.

A specific embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3 as follows.

1 is a six-stage with intermediate rolls (6), (7) which is moved in the direction of the roll axial direction between the upper and lower working rollers (10), (11) and the upper and lower reinforcing rolls (2), (3) It is a rolling mill, and both ends of each roll are supported by the respective metal chokes 12, 13, 4, 5, 8 and 9.

The intermediate rolls 6 and 7 move in the direction of the roll axial direction in accordance with the change of the conditions such as the sheet width of the material rolled by the rolling mill, and the reinforcement rolls 2 for the upper and lower work rollers 10 and 11. , (3) change the support width.

By changing the supporting width, the remaining bending moments of the reinforcing rolls (2) and (3) are reduced by the working rollers (10) and (11) while simultaneously bending the working rolls (10) and (11) themselves. It is a new type rolling mill which greatly improves the roll bending adjustment effect of the work rollers 10 and 11 in an easy state.

A mechanism for moving the intermediate roll in the axial direction and equipped with a roll bending mechanism and a mechanism provided in the balance cylinder of each roll is a new rolling mill, the structure of which is described with reference to FIG. (3), middle rollers (6), (7), work rollers (10), (11) are arranged as shown in the drawing and both sides of the middle rollers (6), (7), work rollers (10), (11) There are a main project block 14 and a subproject block 20 where the metal chocks 8, 9, 12, and 13 of each of the above-described rolls slide and guide. In the project block, roll bending cylinders (21) and (22) for work rollers are installed at the top and bottom to apply the bending force to the arm portions of the work roller metal chocks (12) and (13). The inner side is configured to guide the sliding choke of the work roller.

On the upper part of the main project block 14, there is an upper middle roll balance cylinder device 16 for avoiding the upper middle roll, as well as a cylinder device 17 for axial movement of the upper middle roll. The end of the cylinder is connected to the choke to move the middle roller in the axial direction via the choke.

In addition, there is a reinforcing roll balance cylinder 15 to support the reinforcing roll as in the conventional four-stage rolling mill.

In the lower part of the main project block 14, there is a press-down cylinder 18 for rapidly lowering the lowering roll choke 5 and the lowering roll 3 at the time of replacement and assembly. There is a cylinder 19 for axial movement, and the inter-loading roller 7 is moved through the choke of the drive shaft.

The upper side of the lower protrusions is replaced with the intermediate assembly roller and the replacement assembly rails 23 and 24, and the replacement assembly wheels 25 and 26 of each choke pass through the replacement assembly.

As described above, the upper part and the lower part of the main project block 14 are protrusions because there are cylinders as described above, and the project block 20 between the upper and lower parts is integrated with the main project block 14. In the case of the structure, the bending cylinders 22 and 21 are almost impossible to machine, and it is difficult to repair the packing and seal in the cylinder.

By making it possible to divide such a bad state separately from the secondary block, it is possible to facilitate the machining and repair, while not widening the main block so that the whole rolling mill is compactly finished.

The metal choke 8 of the upper and middle rolls, which is not conventional in the mill, is slidably guided in the up, down and axial directions by a cylinder device installed in the main project block 14, and the guide sliding part is used for replacement assembly of the work roller. The intermediate roll balance cylinder 16 at the place where the main project block 14 is installed allows the upper middle roll to be separated from the lifting work roller, and the upper work roll choke 12 Even when it is necessary to insert the replacement assembly piece 27 between the upper middle roll choke (8) and the upper middle roll choke (8), the replacement assembly can be easily carried out by lifting the upper middle roll choke (8) from the middle roll balance cylinder (16). The dragon piece 27 can be inserted.

Thus, it is very effective means to install a cylinder on the upper projection of the main project block 14 to raise and lower the upper middle roll choke, which is indispensable in the above-described new six-stage rolling mill, which was not present in the conventional rolling mill.

Next, the mechanism for moving the middle roller according to the present invention will be described with reference to FIG.

The main project block 14 attached to the housing 1 is provided with a cylinder hole 28 for moving the middle roller as shown in the drawing, and the hole 28 is packed in a piston rod 115. 116 is a sliding guide when hydraulic pressure is applied.

On both sides of the cylinder bore 28 are end covers 117 and head covers 118, respectively.

The cylinder thus formed is located on both sides of the metal choke 8 of the middle roll 6, and at the tip of the piston rod 115 in the cylinders on both sides, there are two rows of ends 119, It is connected to the connection part 120 on both sides.

In the center of the movable beam 121 connected to the piston rod 115 of this cylinder, there is one cylinder 123 for attaching and detaching the clamp 122 and two left and right levers 124 in front of the cylinder. The hook portion 125 at the tip of the arm 8 'of the choke and the tip of the clamp 122 is formed by the operation of the piston rod of the detachable operation cylinder 123. Either engagement with each other or withdrawal from engagement can be achieved by remote operation.

When the arm 8 'abuts on the movable beam 21, an interval of S occurs between the hook-shaped portion of the arm and the hook portion 125 of the clamp 122 corresponding thereto, and this gap S is generated. By installing the roll cap between the middle roll and the work roller, the middle roll can be easily moved up and down.

A beam guide member 126 is installed below the piston rod 115 in order to secure the distance of the piston rod 115 protruding horizontally from the cylinder.

The beam guide member 126 guides and guides the piston rod 115 and the movable beam 121 mounted at one end of the piston rod 115 in the horizontal direction. The tuning of the right and left cylinders is adjusted so that the left and right uneven loads on the choke 8 are not generated.

According to the intermediate roll movement in this way, it is possible to reliably and quickly move in the roll axial direction by combining with the hydraulic control, and to improve the dimensional variation at the end of the width direction in the shape of the rolling mill and the rolled product. You can get a rolled product.

In addition, in the roll replacement assembly, the choke can be attached and detached by a remote operation by the attachment / detachment device in this movable beam.

3 shows another embodiment of a project block. As shown in FIG. 3, when the diameter of the middle roller and the working roller is small and it is difficult to install three types of cylinders in the upper projection of the main project block, the roller bending cylinder 22 is used as the lower work roller metal choke 13. The upper middle roll balance cylinder device 16 is installed in the sub-project block 20 by providing the upper middle roll balance cylinder device 16 in the same manner as described above.

In this case as well, the sub-project blocks have the same effect in machining maintenance by dividing.

Further, as a third embodiment of the project block, the main project block can be divided into upper and lower parts, and the sub-project block is sandwiched therebetween so as to have the structure shown in FIG.

As in the present invention described above, by installing the upper middle roll balance cylinder on the project block, the upper and middle rolls are raised and lowered to improve workability at the time of replacing the work roller, and the replacement assembly piece for replacing the middle roll. Easily insertable, shortening the assembly time and only the work rollers can be replaced alone.

Also, by dividing the project block into the main block and the sub block, it becomes easy to process and repair the roll pending cylinder and to compactly finish the complex bearing around.

In addition, the above-described middle roll moving mechanism of the present invention makes the structure simpler than the mechanism for moving the middle roll by using a conventional special rotary joint, and it is possible to easily insert and extract the moving mechanism to the middle roller. Therefore, replacement assembly of the middle roll is also easy.

Claims (1)

Each of the upper and lower pairs of working rollers (10), (11), intermediate rollers (6), (7) and reinforcing rollers (2) and (3), and the intermediate rollers (6) and (7) according to the change of rolling conditions. In the rolling mill which moves and rolls in the direction of the roll axial direction, it is integrated or divided up and down for guiding sliding to the metal chocks 8 and 9 of the middle rolls 6 and 7. Secondary project block for guiding sliding of the metal choke 12 and 13 of the work rollers 10 and 11 while simultaneously disposing the main project block 14 in the housing 1 opening. 20) is provided as a separate component from the main project block 14, while the middle roll balance cylinder device 16 for separating the upper middle roll 6 from the work roller 10 and lifting it at the time of replacing the roll is provided. A rolling mill characterized by being disposed in either one of the main project block 14 or the sub project block 20.

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