JPS6016288B2 - rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill, particularly a rolling mill with a novel roll arrangement and roll structure, and its purpose is to improve plate width change, roll deformation characteristics, and roll pending effect. It is an object of the present invention to provide a rolling mill that can effectively control the shape of a rolled material by skillfully linking the characteristics related to the roll surface length to perform efficient rolling work and efficient rolling preparation work.

In recent years, demands on the thickness accuracy of rolled products, especially cold-rolled steel sheets, have become increasingly strict.

On the other hand, although the thickness accuracy in the longitudinal direction of rolled materials has improved considerably due to the rapid development of automatic plate thickness control, there is no effective control means for the thickness accuracy in the width direction of the plate. Of course, as a means of controlling the thickness profile (flatness) of rolled material in the width direction, a method of rolling work rolls in four-high rolling mills has been developed, and has been shown to be quite effective. The actual situation is that the so-called correcting ability to control the shape of the rolled material is limited in the method, and in particular, when the width of the rolled material changes greatly, the ability is insufficient and it cannot be sufficiently effective. This point will be explained in detail below. In order to roll products that are generally in good shape and have little variation in plate thickness, especially in the width direction, bending of the work rolls due to the rolling load should be minimized.

[21. Increase the correction ability through roll pending.

These two points are the most important factors.

First, the phenomenon that the work roll is bent by the rolling load occurs because both ends of the work roll that do not come into contact with the rolled material receive a bending moment due to the contact load with the reinforcing roll. This results in a sharp discrepancy in plate thickness near the boundary point between the rolled and non-rolled parts of the work rolls, that is, on both sides of the rolled material.
In particular, as the width of the rolled material becomes narrower compared to the length of the roll surface, the bending moment increases and the stiffness of the work rolls also increases, resulting in a disadvantage that the discrepancy in sheet thickness becomes larger.

On the other hand, the effect of the roll pending method is greatly affected by the diameter of the work roll. For example, when the diameter of the work roll becomes small, the roll pending action is restrained by the reinforcing roll, and the effect only reaches the vicinity of the roll weave. In addition, the roll pending force is also subject to restrictions such as the strength of the roll neck and the life of the bearings, so its adjustment is limited to a certain range, making it virtually difficult to always change the roll crown as desired. The reality is that the initial crown of the roll must be changed each time the width of the rolled material changes, and if such measures are not taken, unevenness in the thickness of the rolled material in the width direction cannot be prevented, and the product This results in a significant drop in quality.

However, in actual rolling equipment, the width of the rolled material changes frequently, so replacing the rolls each time would result in a significant drop in operating efficiency, and the equipment would have to have rolls with many different types of initial crowns. It is necessary to keep
There is a disadvantage that the number of spare rolls increases significantly and the operating cost increases, leading to a rapid increase in costs.

In order to solve the above problem, we cleverly linked the relationship between plate thickness change, roll deformation characteristics, and the reinforcing roll surface length of the roll pending effect, and specifically, we created a system in which a pair of upper and lower work rolls could each be moved up and down. and a pair of upper and lower intermediate rolls, each of which is supported by a metal chock capable of performing a roll-pending action, and which are arranged one each on the upper and lower sides of the work roll so as to be in contact with the work roll. is configured to be able to move in the direction of the roll koji according to the width of the rolled material to be rolled, and furthermore, this pair of upper and lower intermediate rolls are each supported by reinforcing rolls, and the axial movement of the intermediate rolls can be adjusted in all directions. As a means to perform roll pending control and reduce bending of the work rolls due to rolling load, a pair of upper and lower intermediate rolls is moved in the axial direction, and one end of the valley intermediate roll is moved to one side of the rolled material. By arranging one of the work rolls near the end, the same effect is produced as if the surface length of the reinforcing roll were the same as the sheet width, thereby reducing the bending moment as described above.

Unlike the conventional 4-high rolling mill, the 6-high rolling mill described above has an intermediate roll and a mechanism that can move in the axial direction, and the other reinforcing rolls and work rolls have a balance cylinder mechanism like the subordinate rolls. , and a roll pending mechanism, and its structure is more complex than that of the four-high rolling mill that follows it.

Therefore, it has been difficult to provide various mechanisms of a six-high rolling mill in a subordinate type project block. That is, the project block in the housing of the conventional four-high rolling mill is an integral block, and a work roll pending cylinder device and a back roll balance cylinder device are installed therein.

However, if this follower-type integrated project block were to be used as is in a six-high rolling mill with intermediate roll movement in the ball direction, an intermediate roll movement device in the ball direction and a balance cylinder device for the intermediate roll would have to be additionally installed. In this case, it is almost impossible to machine the cylinder hole for work roll pending, and if that part is made into a protrusion so that it can be machined, the rail for rough replacement at the lower part of the lower project block will be widened, making it difficult for the lower work. The running wheels are poorly attached to the bearing boxes of the rolls and lower intermediate rolls, and when the upper and lower work rolls are combined between the upper and lower intermediate rolls and four rolls are changed at the same time, an unbalanced condition occurs. In this case, the lower intermediate roll moving cylinder cannot be installed on the project block. Alternatively, if the pending cylinder hole is made impossible to machine from the upper side, it will be difficult to install the upper reinforcing roll balance and the upper intermediate roll moving cylinder, and if installed, the middle of the window will be 30 to 40 %, which is uneconomical in manufacturing the housing, and in the case of a tandem mill, the distance between the stands becomes long, which is undesirable in terms of installation of the rolling mill. As mentioned above, when changing the work rolls and intermediate rolls of the new 6-high rolling mill, it is necessary to lift the upper reinforcing roll and the upper intermediate roll to create a gap between each roll, so a roll balance cylinder device is indispensable. The running rails on which the wheels of the lower work roll bearing box and the lower intermediate roll bearing box run must also be arranged rationally in the project block. However, this type of rolling mill (hereinafter referred to as a 6-high rolling mill as it is composed of a set of six o'rolls: upper and lower work rolls, upper and lower intermediate rolls, and upper and lower reinforcing rolls) is different from the conventional rolling mill. Since the number of rolls is large compared to the machine, it may take time to change the rolls or the rough change device may become complicated. To give an example, if you follow the rearrangement method adopted in a secondary four-high rolling mill, the work roll, intermediate roll,
Either provide a dedicated roll changing device for each reinforcing roll, or
Alternatively, it is possible to rearrange the upper and lower work rolls by placing them on the lower intermediate roll, just as the upper and lower work rolls are placed on the lower reinforcing roll in a four-high rolling mill. The equipment becomes complicated and the cost is high, and depending on the latter, intermediate rolls, which are replaced relatively infrequently, are used for reshuffling work rolls, which are reshuffled frequently.
Rapid recombination by using a side shift device or the like becomes impossible because the recombination work time increases and the intermediate rolls used for recombining the work rolls need to be reassembled. Furthermore, when moving the intermediate roll of the new 6-high rolling mill in the axial direction, the shaft end of the roll is directly moved using a special rotating saddle.
The method of moving with a cylinder or screw and the method of the present invention,
It is possible to move the roll by moving the arm part of the metal chock through the chock using a cylinder or screw provided in the housing.

However, the method of using a special rotating rear hand at the end of the roll shaft described in the previous section is a connection for pulling the roll in the axial direction, and it cannot be easily inserted into and extracted from the roll like a conventional spindle coupling. However, there are disadvantages of complicating the structure, such as the need to rotate, the need to adjust the rotation handle to accommodate the roll gap, and the need to accommodate vertical movement of the roll. was there. In order to easily replace the intermediate roll, the tips of both pistons of the intermediate roll moving cylinder (or screw , nuts) are connected by a movable beam, and this movable beam is provided with a chock attachment/detachment device consisting of one cylinder and two levers, which allows the intermediate roll to be moved in all axial directions via the chock. It is recommended to install it on the drive side of the roll. The object of the present invention is to eliminate the drawbacks of the prior art mentioned above, and to provide an economical rolling mill housing that does not expand more than in the prior art;
The project block is made up of a main block and a sub-block in order to be able to install various cylinders, including an upper intermediate roll lifting cylinder that is convenient for work roll rearrangement, without the drawbacks mentioned above, thereby making processing and maintenance convenient. The present invention also provides a project block for a six-high rolling mill that achieves the following objects and allows for good shape adjustment. Another purpose is to simultaneously reassemble the work rolls and intermediate rolls by creating a project block shape that takes into account the shapes of the work roll and intermediate roll bearing boxes and traveling devices (wheels, wheel support members, and spacers).
Alternatively, there is a traveling device that can independently change the work rolls, an engagement/disengagement device that is located between the work roll assembly and the intermediate roll assembly, and that restrains both assemblies in the roll axis direction, and an engagement/disengagement device that restrains both assemblies in the roll axis direction. The purpose of the present invention is to provide a roll reshuffling device comprising a push/pull device that moves.

Another object of the invention is to provide a rolling mill in which the intermediate rolls can be smoothly adjusted and controlled by a hydraulic cylinder or screws and nuts, and which is easier to attach and detach the intermediate rolls and chunks than the rolling mill, and which is convenient for changing rolls. The present invention provides an intermediate roll moving device.

FIG. 1 shows a six-high rolling mill that has intermediate rolls 6, 7 that are movably adjusted in the roll axis direction between upper and lower work rolls 10, 11 and upper and lower reinforcing rolls 2, 3, and both ends of each roll are Each metal chock 12, 13, 4, 5, 8,
Supported by 9. The intermediate rolls 6 and 7 move in the roll axis direction in response to changes in conditions such as the plate of the rolling mill, and the reinforcing rolls 2 and 3 are connected to the upper and lower work rolls 10 and 11.
It is something that changes the support system. By changing the support, the extra bending moment of the reinforcing rolls 2, 3 relative to the work rolls 10, 11 is reduced, and at the same time, the work rolls 10, 11 themselves are made easily bendable, thereby making the work rolls 10, 11 roll pending. This is a new type of rolling mill with greatly improved adjustment effects. The rolling mill is equipped with a cylinder for moving this intermediate roll in the rolling direction, and a roll pending mechanism and a mechanism equipped with balance cylinders for each roll are newly constructed in a rolling mill. 3. The intermediate rolls 6, 7 and work rolls 10, 11 are arranged as shown in the figure, and the intermediate rolls 6, 7,
7. On both sides of the work rolls 10 and 11, there are a main project block 14 and a sub-project block 20, which guide the work to the metal chocks 8, 9 and 12, 13 of each roll, and the sub-project block has a work block. Roll pending cylinders 21 and 22 for rolls are provided above and below, and work roll metal chocks 12 and 13
The pending force is applied to the arm portion of the block, and the inside of the block is designed to guide and slide the work roll chock. At the top of the main project block 14, there is an upper intermediate roll balance cylinder 16 for raising the upper intermediate roll for single work rolls or for rearranging work and intermediate rolls, and a cylinder 17 for moving the upper intermediate roll in the axial direction. The tip of the cylinder is connected to a chock on the drive side, and the intermediate roll is moved in the direction of the core via the chock. Furthermore, like the conventional four-high rolling mill, there is a reinforcing roll balance cylinder 15 for supporting and balancing the reinforcing rolls. Further, at the bottom of the main block 14, there is a lower reinforcing roll chock 5, a push-down cylinder 18 for quickly lowering the lower reinforcing roll 3 when refining, and, like the upper part, there is a cylinder 19 for moving the lower intermediate roll in the axial direction. , the lower intermediate roll 7 is moved via a chock on the driving side. The upper side of this lower protrusion becomes the recombination rails 23 and 24 for intermediate rolls and work rolls, and the rough change wheels 25 and 26 of each chock are arranged so that the change speed is passed. The running surface of the rearranged wheels attached to each chock is the side shift frame 34 shown in FIG.
The lower work roll assembly is mounted on the rail, which has a step similar to that of the rail, and serves as a two-stage running surface, and the lower intermediate roll assembly is suspended on the rail.

In addition, a removable spacer 42 is provided between the upper work roll metal chocks 12, 12' and the lower work roll metal chocks 13, 13'.
When the lower reinforcing roll is lowered by lowering the lowering ram 29 in the lower reinforcing roll 3 and lowering the lower reinforcing roll 3, the upper work roll assembly is placed on the lower work roll assembly and the upper and lower work rolls are moved upward and downward. A gap is formed between the work rolls.

Further, the lower intermediate roll is further lowered than the lower work roll, creating a gap between it and the work roll, and is suspended on the refining rail. In this way, the master.

As mentioned above, the upper and lower parts of the block 14 are protruding parts because of the cylinders therein, and if the sub-block 20 located between the upper and lower parts is integrated with the main block, the pending cylinders 22, 21 It is almost impossible to process the cylinder, and since it is a cylinder, it is difficult to maintain the packing and seals. By dividing such defects into separate sub-blocks, processing and maintenance can be facilitated, and the entire rolling mill can be made compact without making the inside of the main block large. The metal chock 8 of the upper intermediate roll, which was not present in conventional mills, is slidably guided in the vertical and marring directions by the project block 14, and the intermediate roll is installed in the project block 14 of the in-row sliding part when changing work rolls roughly. The upper intermediate roll can be lifted up by the balance cylinder 16 and separated from the work roll, and in order to roughly change the upper intermediate roll 6, a kuniker piece 46 is inserted between the upper work roll chock 12 and the upper intermediate roll chock 8. Even when it's necessary,
This intermediate roll balance cylinder 16 can easily lift the upper intermediate roll chock 8. Providing a cylinder on the upper protrusion of the main project block 14 to raise and lower the upper intermediate roll chock in this way is a very effective means, and is something that the new six-high rolling mill mentioned above lacks. This is something that cannot be done in the rolling mill of the subsidiary. Further, the work and rearrangement of the intermediate rolls are carried out by the above-mentioned operations and the rearrangement device described below.

The lower work roll metal chock 12' has a rough replacement hook 41 that engages with a hook 37 provided at the tip of the rod 45 of the push/pull cylinder. A coupling fitting 45 that can be engaged and disengaged is provided between the protrusions 47. The roll 31 is moved in the direction of the roll axis toward the operating side of the rolling mill. There is a silk replacement car 32, and a side shift frame 3 is mounted on the top of it.
4 is provided.

This side shift frame 3j4 is operated by a side shift cylinder 35. In addition to the above-mentioned device, there is also a reinforcing roll rearranging device, and the lower reinforcing roll chock 5
, 5' are laid inside the rolling mill, and extending from this, there is a rail 39 on the foundation outside the rolling mill, and an independent rough replacement sill 10 is provided. It will be done. A drive shaft 43 for the work rolls 10 and 11 is provided on the opposite side to the side where these Morohishi straights are provided (operation side), and a spindle carrier is provided to prevent the drive shaft 43 from tilting when changing the rolls. 44 are provided. The rough replacement procedure is as follows.

The lower work roll 11 is placed on the inner rail 23 by the above-mentioned operation.
, and at the same time the upper work roll 1 is moved by the baser 42.
0 is supported and in the rough change position, the pongee change cart 32 connected to the cylinder rod 45 is moved on the rail 31 by operating the cylinder 36, transported to the change position and fixed, and the rod 45 is moved to the change position.
(coupling device not shown). At this time, the hook 37 installed at the tip of the cylinder rod 45 meshes with the rough replacement hook 41 attached to the lower work rotor metal chock 13', and the cylinder rod 45 is immediately ready to be pulled out. Next, the rope changing cylinder 36, cylinder rod 45, hook 3
The roll is pulled out to the side shift frame 34 by the action of the push/pull device consisting of 7, and the new roll that had been placed outside the line on the side shift frame 34 and the pulled out inner roll are exchanged by the operation of the side shift cylinder 35. The new upper and lower work rolls 10 and 11 that have been maintained by the push-pull and counterfeit operations are installed again, and the silk replacement cart is moved back to complete the rough replacement work. FIG. 3 shows the state in which the hook 37 is removed after the upper and lower new work rolls 10, 11 have been installed, and the old work rolls 10', 11' pulled out on the side shift frame 34 of the silk changing cart are shown. There is. The purpose is to simultaneously pull back the cylinder rod 45 from this state and simultaneously move the silk changing cart 32 backward. Next, the intermediate rolls 6 and 7 are replaced with silk at the same time as the work rolls 10 and 11 by the next operation.

First, as in the previous case, after preparing the work roll rearrangement,
Upper middle. Work roll metal chock 12,1 on roll 6
2' via the baser 46, and the recombination hook 41 attached to the lower work roll metal chock 13' and the connecting protrusion 41 attached to the lower intermediate roll metal chock 9'.
are engaged with the connecting fittings 45. Then, with exactly the same operation as the work rearrangement work, the upper and lower intermediate rolls 6, 7, the upper and lower work rolls 10,
11 will be rearranged. As described above, according to the embodiments of the present invention, it becomes possible to rearrange the work rolls and intermediate rolls in a rational and efficient manner using a single roll rearranging device. The roll axial movement adjustment device quickly follows changes in rolling conditions (differences in rolling mill width, stepped rolling, meandering of the rolling mill, etc.) and moves the upper and lower intermediate rolls 4 and 5 to positions that match the rolling conditions. In addition, when changing roles,
It is required that the connection with the roll can be easily attached and detached.

The present invention was devised in view of the above requirements, and will be explained below with reference to FIGS. 6 and 7 of specific embodiments. As shown in the figure, the project 14 attached to the housing 1 with a spigot is provided with a cylinder hole 48 for moving the intermediate roll. It becomes a sliding guide when . An end cover 49 and a head cover 50 are attached to both sides of the cylinder bore 48, respectively. The cylinders constructed in this manner are located on both sides of the metal chock 8 of the intermediate roll 6, and the piston rods 51 on both cylinders have forends 56 at their tips and are connected to connecting portions 55 on both sides of the movable beam 54. has been done. A cylinder 23 for attaching and detaching a clamp 22 is placed in the center of a movable beam 54 connected to a piston rod 51 of this cylinder.
There is one lever 24 at the end of the cylinder, which consists of two levers 24 on the left and right, and a cylinder 59 for attaching and detaching.
By operating the chock, the tip of the arm 8' of the chock can be grasped or removed to attach or detach the chock. There is a gap S between the tip of the arm 8' and the clamp 57, so that the upper and lower parts of the intermediate rolls 6 and 7 can be moved easily. Moreover, the movable beam 54 is connected to the piston rod 5
The chock 8 is supported and guided by the beam guide 53 in order to prevent the occurrence of unbalanced loads on the chock 8 to the left or right, in the sense that it has an overhang-like shape at the tip of the rod and adjusts the synchronization of the left and right cylinders. being done.

As another example of the roll moving device, a method of driving the screw 60 to move the movable beam 54 as shown in FIG. 7 can also achieve similar effects.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a project block of a rolling mill according to the present invention. FIG. 2 shows another embodiment of the project block. FIG. 3 shows an embodiment of a rolling mill and roll changing device according to the present invention. FIG. 4 is an embodiment showing the state of the roll rearrangement diamond layer in which the upper and lower work rolls and intermediate rolls are pulled out. FIG. 5 is an embodiment showing a cross section of a roll changing truck. FIG. 6 shows an embodiment of a roll axial movement device for an intermediate roll of a rolling mill according to the present invention, which uses a hydraulic cylinder blind path. FIG. 7 shows another embodiment of the movement of the intermediate roll in the roll axis direction. 2, 3... Reinforcement roll, 6, 7... Intermediate roll, 10, 11... Work roll, 8, 9, 12, 13... Metal choke,
14...Main project block, 15...Upper reinforcing roll balance cylinder, 16...Upper intermediate roll balance cylinder, 17...Cylinder for axial movement of the upper intermediate roll, 19...For axial movement of the lower intermediate roll cylinder, 2
0...Sub-project block, 23...Rail for lower work roll, 24...Rail for lower intermediate roll o 1st
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. A rolling mill that has a pair of upper and lower work rolls, an intermediate roll, and a reinforcing roll, and performs rolling by adjusting the movement of the intermediate roll in the roll axis direction according to changes in rolling conditions,
The upper part of the main project block is equipped with a balance cylinder device for the upper reinforcing rolls and the balance cylinder device for the upper intermediate rolls, and the lower part of the main project block is provided with a reassembled rail for the lower intermediate rolls and a reassembled rail for the lower work rolls. A rolling mill further comprising a sub-project block separate from the main project block, and each of the sub-project blocks provided with bending cylinders for upper and lower work rolls. 2. A roll axial movement device for the intermediate roll equipped with a movable beam and a clamp device for attaching and detaching the metal chock of the intermediate roll to the movable beam is provided on the drive motor side of the roll, and the clamp device is operated to move the intermediate roll to the methyl chock. Claims characterized in that a roll assembly carriage device is arranged so as to be movable relative to the housing of the rolling mill, and which allows the rolling mill to be freely attached and detached and to rearrange the work rolls and intermediate rolls simultaneously or individually. The rolling mill according to item 1.