JPH0532125B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an online roll grinding device, in which a grinding wheel, etc. It is designed so that it can be ground using a grinding body.

<Conventional technology> Normally, as the rolling amount of steel strips and other rolling rolls increases, the roll surface in contact with the rolling mill is worn out and deformed, and the quality of the rolled product is impaired due to foreign matter partially adhering to the roll surface. .

For this reason, operations are periodically halted and replaced with pre-maintained spare rolls, and deteriorated rolls are grinded off-line. In this case, the rolling operation is interrupted due to the work of changing the rolls, which not only causes a decrease in production, but also
There is a large economic loss as it takes a lot of labor and time to transport the deteriorated rolls and roll chips to a grinding and maintenance shop.

Therefore, as a countermeasure to this problem, various types of online roll grinding devices (for example, JP-A-51-146361, JP-A-54-120266, JP-A-Sho 54-120266, 55-144952, etc.) have been proposed. These all relate to the work rolls of a normal rolling mill in which the axes of the upper and lower rolls are arranged parallel to a line perpendicular to the rolling direction, and the grinding bodies (e.g. grinding wheels)
is configured to move in the roll width direction within a horizontal plane in the rolling direction and at right angles to the rolling direction.

On the other hand, in recent years, requirements for thickness accuracy in the width direction of rolled products have become increasingly strict, and currently, in order to cancel the deflection of the rolls due to rolling loads, many rolls with initial crowns are stocked and converted, and workpieces are Roll bending method etc. are used. However, in the former case, the crown of the roll changes due to abrasion and thermal expansion of the roll as the rolling process progresses, so it is necessary to replace the roll each time, resulting in a decrease in production.
In addition, in the latter case, there is a limit to the bending that can be applied to the work roll due to the strength of the roll neck of the work roll, and the ability to modify the thickness shape in the sheet width direction cannot be fully demonstrated. If the width of the plate is narrow, there is a disadvantage that the contact portions at both ends of the back-up roll and the work roll get in the way and the desired results cannot be fully achieved.

Therefore, in order to eliminate the above-mentioned drawbacks, the present inventor has developed a method that enables control of the thickness in the width direction in a rolling mill that rolls rolled products with a wide range of width dimensions using the same roll, and also increases the life span of the rolls by more than double that of conventional rolling mills. Developed a rolling mill that can
(Cross-roll type four-high rolling mill disclosed in Japanese Patent Publication No. 58-23161). In this rolling mill, the upper and lower rolls each have axes inclined at a required angle with respect to a line perpendicular to the rolling direction in a horizontal plane, and the two axes intersect.

<Problems to be Solved by the Invention> Although the above-mentioned drawbacks are largely improved by this method, problems such as abrasion, deformation, and adhesion of foreign matter to the roll surface due to an increase in rolling amount are not solved. Therefore, even in this type of cross-roll rolling mill, a means for grinding the cross rolls online is required. However, in the grinding apparatus according to the prior art described above, the grinding body cannot move to follow the cross angle of the rolls, so this cannot be applied to a cross roll type rolling mill.

In view of the above-mentioned prior art, an object of the present invention is to provide an online roll grinding device that enables online grinding of a work roll while ensuring parallelism between the grinding surface and the axis of the work roll in a cross roll rolling mill. .

<Means/effects for solving the problems> The configuration of the present invention to achieve the above object is to displace the roll chock that supports the work roll in the rolling direction, and change the angle formed by the axis of the work roll with respect to the rolling direction in a horizontal plane. A work roll grinding device installed in a cross-roll rolling mill that can be tilted from a right angle, which is rotatable in a horizontal plane about a vertical axis and movable in the radial direction of the work roll. a work roll grinding means provided with a grinding body that can come into contact with the surface of the work roll; and a work roll grinding means that is provided on the work roll grinding means and can come into contact with one side of the roll chock and protrude to an arbitrary length in the radial direction of the work roll. a free cushion head having a free cushion head shaft; and a fixed cushion head shaft which is provided on the work roll grinding means and has one end in contact with the other side of the roll chock, and which protrudes an arbitrary length in the radial direction of the work roll and whose protrusion length can be fixed. The work roll grinding means is tilted to follow the tilting movement of the work roll by the free and fixed cushion heads, and the parallelism with the work roll axis is determined by the pressing reaction force of the grinding body. This is to keep it independent of fluctuations.

<Embodiment> Fig. 1 shows an online grinding device according to an embodiment of the present invention, and Fig. 1 a shows its plane, and Fig. 1 b
1A shows the section B-B in FIG. 1A, FIG. 1C shows the section of the fixed and free cushion head, FIG. 1D shows the section D-D in FIG. 1C, and FIG. E in c
-E cross section, Figure 2 shows the explanation of the operation of the online roll grinding device shown in Figure 1, Figure 2a explains the operation during grinding, and Figure 2b shows the operation when the work roll is crossed. An explanation is provided.

As shown in FIGS. 1a and 1b, the upper work roll 1 and the back-up roll 2 are rotatably supported at both ends via roll jocks 5 and 6, and are supported by jacks (not shown) provided in the housings 7a and 7b. By rotating each of the roll jocks 5 and 6 about the vertical axis in the same horizontal plane, the upper work roll 1 and the backup roll 2 can cross each other with the lower work roll (not shown) and the backup roll (not shown). It is set as.

The pair of guide frames 9a and 9b are fixed to the inner surfaces of the housings 7a and 7b above the pass line 8 so as to face each other, and have guide grooves 9 with appropriate inclination angles.
It has c. The slide frame 10 is fitted into the guide groove 9c via protrusions 10a and 10b protruding from both ends thereof, and is movable back and forth in the rolling direction (Z direction) along the guide groove 9c. It's summery. Moreover, this slide frame 10 is formed in a box shape with an open part on the roll side.
A pair of brackets 11a and 11b are provided protruding near both ends of the side opposite to the roll. Thus, the slide frame 10 is attached to the brackets 11a, 1.
Lever 14a, 14b, pin 13a, 13 pivotally connected to 1b by pin 12a (only one is shown in the figure)
b. It is suspended from a tuning shaft 17 via levers 15 and 16. Both ends of the tuning shaft 17 are connected to the housing 7
A pair of bearings 18a, 18b fixed to a, 7b
It is rotatably supported via the shaft. The levers 15 and 16 are each fixed to the tuning shaft 17, and one end of the lever 16 extends upward and is connected to the piston rod of the cylinder 20 by a pin. The cylinder 20 is pin-coupled to a support base 19 fixed to the housing 7b. On the other hand, a support base 24 is pivotally attached to the opening of the slide frame 10 at the center position in the roll width direction by pins 25 and 26 facing in the same vertical direction. Thus, the support base 24 has a seat plate 24 protruding from its bottom plate 24a.
b, 24c and liners 27a, 27b, it is horizontally rotatable around pins 25, 26. A work roll grinding means 22 having a grinding body 21 (for example, a grindstone) attached to the tip thereof is attached to the support base 2.
It is installed on 4. Thus, the work roll grinding means 22 can rotate in a horizontal plane about the vertical axis formed by the pins 25 and 26, and can also move in the radial direction of the upper work roll 1, thereby grinding the grinding body 21 into the upper work roll 1. It is designed so that it can be brought into contact with and separated from the surface at right angles. Further, a free cushion head 28a is provided on one side of the support base 24, and a fixed cushion head 28b is provided on the other side.
Free and fixed cushion head shaft 2 provided in
9 and 30 are protrusions 5a and 5b of the roll chock 5.
It is coming into contact with the

The free cushion head 28a is composed of main members such as a case 31 fixed to the support base 24, a piston 33 containing an elastic body 32, and a free cushion head shaft 29 consisting of a large diameter portion 29a and a small diameter portion 29b.

That is, a hole 34 is bored in the case 31, and the hole 34 is connected to the front chamber 3 by a partition wall 35 provided in the center.
It is divided into a rear chamber 4a and a rear chamber 34b. Front chamber 34
A has a liner 37 at its tip that contacts the protrusion 5a.
The large diameter portion 29a of the free cushion head shaft 29 is removably provided, and the small diameter portion 29b of the free cushion head shaft 29 is fitted into the partition wall 35.
It can be slid freely in the axial direction. Small diameter part 29
A seal ring 36 is provided between b and the partition wall,
The end surface of the small diameter portion 29b can protrude toward the rear chamber 34b, so that the free cushion head shaft 29 is connected to the front chamber 34.
A piston is formed within a. A guide groove 38 is provided in the axial direction on the outer periphery of the large diameter portion 29a of the free cushion head shaft 29, and the case 31 engages with this guide groove 38 to prevent the free cushion head shaft 29 from rotating and to limit the movement stroke in the axial direction. Additionally, a stop pin 39 for preventing escape from the case 31 is detachably attached. On the other hand, a cover 40 provided with a groove 40a is removably provided at the end of the rear chamber 34b, and the rear chamber 34b constitutes a cylinder chamber. A piston 33 equipped with an elastic body 32 is built into the rear chamber 34b, and a piston rod 41 of the piston 33 is slidably fitted into a groove 40a of a cover 40, and the piston 33 is moved toward the front chamber 34a by the elastic body 32. The piston 33
The end face of the free cushion head shaft 29 is in contact with the end face of the small diameter portion 29b of the free cushion head shaft 29. In other words, the rear chamber 34
When hydraulic pressure is supplied to b, the piston 33 and the free cushion head shaft 29 separate from each other and the elastic body 3
2 is compressed, the end surface of the piston rod 41 comes into contact with the bottom of the groove 40a, and the free cushion head shaft 29 presses against the protrusion 5a of the roll chock 5 with hydraulic pressure. Conversely, when the hydraulic pressure in the rear chamber 34b is released, the piston 33 and the free cushion head shaft 29 move together toward the roll chock 5 due to the elastic force of the elastic body 32, and the free cushion head shaft 29 moves toward the protrusion 5a of the roll chock 5. is pressed by the elastic force of the elastic body 32. In the figure, 42 is a flexible tube for supplying hydraulic pressure, and 43 and 44 are air holes.

The fixed cushion head 28b, like the free cushion head 28a, has a case 51 fixed to the support base 24, a piston 53 containing an elastic body 52, a fixed cushion head shaft 30, etc., which is composed of a large diameter part 30a and a small diameter part 30b. It is made up of parts.

That is, a hole 54 is bored in the case 51, and the hole 54 is connected to the front chamber 5 by a partition wall 55 provided in the center.
4a and a rear chamber 54b. Front chamber 54
A has a liner 53 at its tip that comes into contact with the protrusion 5b.
The large diameter portion 30a of the fixed cushion head shaft 30 is removably provided, and the small diameter portion 30b of the fixed cushion head shaft 30 is fitted into the partition wall 55.
It can be slid freely in the axial direction. Small diameter part 30
A seal ring 56 is provided between b and the partition wall,
The end surface of the small diameter portion 30b can protrude toward the rear chamber 54b, so that the fixed cushion head shaft 30 is connected to the front chamber 54.
A piston is formed within a. A guide groove 58 is provided in the axial direction on the outer periphery of the large diameter portion 30a of the fixed cushion head shaft 30, and the case 51 engages with this guide groove 58 to prevent the fixed cushion head shaft 30 from rotating and to limit the movement stroke in the axial direction. Additionally, a stop pin 59 for preventing escape from the case 51 is detachably attached. Furthermore, the fixed cushion head shaft 30 is provided with a concentric stepped hole 60. On the other hand, a cover 61 provided with a groove 61a is removably provided at the end of the rear chamber 54b, and the rear chamber 54b constitutes a cylinder chamber. Rear chamber 54b
has a built-in piston 53 equipped with an elastic body 53, and a piston rod 6 on one side of the piston 53.
2 is slidably fitted into the groove 61a of the cover 61. The piston rod 63 on the other side of the piston 53 is slidably fitted into the stepped hole 60 of the fixed cushion head shaft 30.
A nut 64 is screwed onto the end of the nut 6.
4 can come into contact with the stepped portion 60a of the stepped hole 60. That is, by adjusting the nut 64, the movement stroke between the fixed cushion head shaft 30 and the piston 53 can be adjusted.
Further, the piston 53 is moved into the front chamber 54 by the elastic body 52.
The end face of the piston 53 is in contact with the end face of the small diameter portion 30b of the fixed cushion head shaft 30. That is, when hydraulic pressure is supplied to the rear chamber 54b, the piston 53 and the cushion head 30 are separated from each other, the elastic body 52 is compressed, and the nut 64 screwed into the end of the piston rod 63 is provided on the fixed cushion head shaft 30. stepped hole 60
The protrusion 5b of the roll chock 5 is pressed against the stepped portion 60a of the roll chock 5 while the protrusion length of the fixed cushion head shaft 30 relative to the case 51 is fixed. Conversely, when the hydraulic pressure in the rear chamber 34b is released, the piston 53 and the fixed cushion head shaft 30 move together toward the roll chock 5 due to the elastic force of the elastic body 52, and the fixed cushion head shaft 3
0, the projection 5b of the roll chock 5 is pressed by the elastic force of the elastic body 52. In the figure, 65 is a hydraulic seal ring between the piston rod 63 and the cushion head 30, 66 is a flexible pipe for supplying working hydraulic pressure, and 6
7 and 68 are air holes.

In the online roll grinding device having the above configuration, when the upper work roll 1 is set at an arbitrary cross angle, the work roll grinding means 22 is rotated between the free cushion head 28a attached to the support base 24 and the free cushion head 28b provided on the fixed cushion head 28b. The pin 2 is pushed by the protrusions 5a and 5b of the roll chock 5 via the fixed cushion head shafts 29 and 30.
5 and 26 as rotation centers. In other words,
The work roll grinding means 22 horizontally rotates integrally with the upper work roll 1 on which the free cushion head 28a and the fixed cushion head 28b abut,
The grinding body 21 can be pressed against the surface of the upper work roll 1, and the entire width of the upper work roll 1 can be ground. Furthermore, when recombining the rolls, by operating the cylinder 20, the work roll grinding means 22 can be easily and quickly retreated to avoid interference with the roll chock 5, and by adjusting the pushing force of the cylinder 20, the work roll grinding means 22 can be moved freely and quickly. Fixed cushion head shaft 2
Projections 5a and 5b of roll chock 5 of 9 and 30
The pressing force (desirably, the pressing force is light enough to cause close contact) can be appropriately selected.

Next, the procedure for setting the parallelism of the work roll grinding means 22 to the roll axis will be explained with reference to FIGS. 1c and 2.

When a suitable amount of hydraulic pressure is supplied from the flexible tube 66 to the rear chamber 54b of the fixed cushion head 28b, the piston 53 compresses the elastic body 52, and the piston rod 62 engages with the bottom of the groove 61a of the cover 61, and the fixed cushion head shaft 30 is pushed out toward the roll chock 5 and is engaged with a nut 64 that is threaded onto the tip of a piston rod 63 through a stepped hole 60. That is, the fixed cushion head shaft 30 is fixed at the stroke end by hydraulic pressure. In this case, the movement stroke between the fixed cushion head shaft 30 and the piston rod 63 is adjusted in advance using the nut 64 so that the protruding length of the fixed cushion head shaft 30 from the front end surface of the case 51 is a set value S. This stroke S has a dimension that absorbs vibrations caused by the rolls during rolling and allows the work roll grinding means 22 to freely follow fluctuations in the cross angle of the upper work roll 1.

Next, the rear chamber 34b of the free cushion head 29a
When a suitable amount of hydraulic pressure is supplied from the flexible tube 42 to the piston 33, the elastic body 32 is compressed, the piston rod 41 is engaged with the bottom of the groove 40a of the cover 40, and the free cushion head shaft 29 is pushed toward the roll chock 5. to press the protrusion 5a.
When the free cushion head shaft 29 presses the protrusion 5a, the work roll grinding means 22 presses the pin 25,
26 as a fulcrum, and the fixed cushion head shaft 30 of the fixed cushion head 28b is rotated around the protrusion 5.
b. Thus, the protruding lengths of the free and fixed cushion head shafts 29, 30 are the same length S, and the front end surface of the grinding body 21 is automatically set parallel to the work roll axis.

In addition, in FIG. 2a, six grinding bodies 21 are arranged at equal pitch l, the surface of the grinding bodies 21 is pressed against one surface of the work roll and moved to the working side W end, and the pressing of the grinding bodies 21 Assuming that the reaction force F ₄ acts on a line passing through the center of rotation of the support base 24, the pressing reaction force Ff of the free cushion head shaft 29 has the maximum unbalance moment due to the pressing force of the grinding body 21.
Since F ₁ ×Lx acts, the reaction force Ff of the free cushion head shaft 29 is the same as that of the fixed cushion head shaft 30.
For the reaction force F ₀ of , Ff<F ₀ . On the contrary, the grinding body 21
When the head moves to the drive side D end, an unbalance moment of the same magnitude is applied to the fixed cushion head shaft 30.
Ff>F ₀ . Therefore, the free cushion head 28a, the fixed cushion head 2
It is sufficient to supply the rear chambers 34b and 54b of 8b with a hydraulic pressure that opposes this unbalanced moment.

FIG. 2b shows the operating state during rolling. When the hydraulic pressure to both rear chambers 34b, 54b is released, the elastic force Fb of the elastic bodies 32, 52 causes the pistons 33, 53 to move freely and The fixed cushion head shafts 29 and 30 are each integrally pressed against the roll chock 5 and can follow any roll cross angle θ.

In the above embodiment, the grinding device of the present invention was provided on the upper work roll.
Of course, it can also be applied to the lower work roll. Furthermore, the present invention is not limited to the above-mentioned embodiment, and various design changes may be made without departing from the spirit of the present invention.

<Effects of the Invention> In the present invention, it is possible to grind the work roll surface at any time while the work roll is assembled in the rolling mill housing during rolling at any roll cross angle or during rolling idle time. Become. In addition, it is possible to accurately set the parallelism of the work roll grinding means to the work roll axis, and
Parallelism can be maintained regardless of fluctuations in the pressing reaction force of the grinding body, and grinding performance can be improved. As a result, work roll grinding work can be carried out smoothly and accurately online, greatly extending the life of work rolls and significantly reducing the number of offline grinding operations, improving productivity and reducing maintenance costs. It is possible to reduce the

[Brief explanation of the drawing]

FIG. 1 shows an online grinding device according to an embodiment of the present invention, FIG. 1 a is a plan view thereof, and FIG. 1 b
is a cross-sectional view taken along line B-B in Figure 1a, Figure 1c is a cross-sectional view of the fixed and free cushion heads, Figure 1d is a cross-sectional view taken along line D-D in Figure 1c, and Figure 1e is a cross-sectional view of the fixed and free cushion heads. A sectional view taken along the line E-E in Figure c, Figure 2 shows an explanation of the operation of the online roll grinding device shown in Figure 1, and Figure 2 a
2 is an explanatory diagram of the action during grinding, and FIG. 2b is an explanatory diagram of the action during work roll crossing. In the drawing, 1 is a work roll, 5 is a roll chock, 5a and 5b are projections, 21 is a grinding body, 22 is a work roll grinding means, 28a is a free cushion head, 28b is a fixed cushion head, 29 is a free cushion head shaft, and 30 is a fixed part. A cushion head shaft, 32 and 52 are elastic bodies, 33 and 53 are pistons, 60 is a stepped hole, and 64 is a nut.

Claims (1)

[Claims] 1. A work roll grinding device installed in a cross-roll rolling mill capable of displacing a roll chock supporting the work roll in the rolling direction and tilting the angle formed by the axis of the work roll from perpendicular to the rolling direction in a horizontal plane. , a work roll grinding means equipped with a grinding body that is rotatable in a horizontal plane about a vertical axis and movable in the radial direction of the work roll and that can come into contact with the surface of the work roll; a free cushion head provided on the roll grinding means and having a free cushion head shaft that can abut on one side of the roll chock and protrude an arbitrary length in the radial direction of the work roll; and a free cushion head provided on the work roll grinding means and on the other side of the roll chock. 1. A fixed cushion head having one end in contact with the work roll and a fixed cushion head shaft which projects a desired length in the radial direction of the work roll and whose protrusion length can be fixed.