JPH0462805B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a mill roll grinding device, and particularly to a device used for online grinding of a work roll of a rolling mill such as a hot rolling mill.

<Conventional technology> In hot rolling mills and the like that roll steel plates, etc., in order to improve production efficiency and improve the quality of rolled plates, a grinding device is directly attached to the rolling mill and the roll surface is polished to the required degree while rolling. Various online roll grinding devices for profile grinding have been developed and put into practical use.

Figure 5 shows an example of such an online roll grinding method, in which a grinding body 2 such as a non-rotating grindstone is pressed against the surface of the work roll 1 while the work roll 1 is being rotated, and the grinding body 2 is pressed against the surface of the work roll 1 in the roll axis direction, that is, perpendicular to the plane of the paper. By moving in the direction of
Grind the surface of work roll 1 to a required profile. FIG. 6 shows another example, in which a rotating grinding body 2' is pressed against a rotating work roll 1 in the same manner as in the previous example, and the grinding body is moved in the roll axis direction for grinding.

Various types of online roll grinding devices for rolling mill rolls have been devised to date in addition to those described above, but the above two examples are representative of those that have been put into practical use.

<Problems to be Solved by the Invention> The apparatus of the method shown in FIG. Since the surfaces are the same, clogging occurs on the surface, which reduces grinding performance. Furthermore, the grinding body 2 usually uses a square block-shaped grindstone, and a device is used in which a plurality of these are arranged in the direction of the roll axis to increase the grinding efficiency with a wide grinding surface, but in this case, the grinding body 2 There is a drawback that the corner portion 2a is easily damaged due to grinding resistance or the like.

On the other hand, in the system shown in Fig. 6, since the grinding body 2' rotates, the new grinding surface always comes into contact with the work roll 1 during grinding, which prevents clogging of the surface of the grinding body 2' and improves grinding performance. It also has the advantage of being sustainable. Further, since a disc-shaped grindstone is usually used as the grinding body 2' in this case, it is possible to prevent the corner portion from being damaged as in the case of the square block-shaped grindstone. However, this method requires a rotary drive device (not shown) to rotate the grinding body 2', which complicates the structure, increases equipment costs, and requires very limited maintenance and inspection of the equipment. There are drawbacks such as difficulty.

An object of the present invention is to provide a rational device that overcomes the drawbacks of the conventional online roll grinding device as described above.

<Means for Solving the Problems> The rolling roll grinding device of the present invention is provided with a frame capable of reciprocating in parallel directions parallel to the roll axis, and within this frame, the tip end surface is pressed against the surface of the roll. A plurality of grinding body holders that rotatably hold the grinding body are provided along the axial direction of the roll, and the rotation center axis of the grinding body is tilted in the roll axis direction with respect to the direction perpendicular to the roll axis. The grinding body holder is equipped with a pressing device that presses the tip end surface against the surface of the roll, and an elevating drive that raises and lowers the frame in response to changes in the center height of the roll, which is determined by the vertical direction of the roll and changes in the roll diameter. The device is characterized by being equipped with a device.

<Function> In the rolling roll grinding apparatus of the present invention configured as described above, when the grinding body whose rotating shaft is inclined in the roll axis direction with respect to the direction perpendicular to the roll axis is pressed against the rotating roll, the grinding is performed. The body rotates while maintaining linear contact with the roll surface, and the roll surface is ground by the relative sliding that occurs at the point of contact between the grinding body and the roll. Then, the grinding body is automatically raised and lowered and moved back and forth in response to changes in the center height of the roll determined by the vertical position of the roll and the roll diameter, and the grinding body is set at an optimal position to perform grinding.

<Example> Hereinafter, the structure of the present invention will be explained in more detail based on the example shown in the drawings. FIG. 1 is a plan view showing an embodiment of the roll grinding device of the present invention applied to, for example, an upper work roll of a four-high rolling mill, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1.

As shown in the figure, the rolling mill rolls a rolled plate material 25 using work rolls 1.
is reinforced by Backup Prowl 2.
A plurality of grinding bodies 3 such as cylindrical or rod-shaped grindstones arranged in the axial direction of the work roll are each rotatably supported at the tip of a grinding body holder 6 via a shaft 4 and a bearing 5. . In the illustrated example, the grinding body 3 is a cylindrical grindstone, and in the following description, the grinding body 3 will be referred to as the grindstone 3, and the grinding body holder 6 will be referred to as a grindstone holder 6.

Each grindstone holder 6 forms a plunger,
A rear partition wall 7 is connected to a pressing device 8 consisting of a plunger 8a and a cylinder 8b, and is fitted into a frame 9 so as to be movable back and forth in the direction of arrow X. Each pressing device 8 is a rear cover 9a of the frame 9.
By supplying hydraulic oil from the hole 10 to the cylinder 8b through a hydraulic control valve (not shown), the grindstone 3 can be pressed against the surface of the work roll 1 at an arbitrary set pressure. In addition, the frame 9 has a pullback cylinder chamber 1 for the grindstone holder.
A refueling port 12 to the fuel tank 1 is provided.

Further, as shown in FIG. 1, the rotational axis O _G of each grindstone 3 is inclined in the roll axis direction at an arbitrary set angle α with respect to the direction perpendicular to the axis O _R of the work roll 1, and the grindstone holder 6 is attached to the frame 9. installed inside. In addition, the frame 9 is
By raising and lowering the axis _of rotation of the grinding wheel 3,
can be offset upwardly or downwardly with respect to the work roll axis _OR . The illustrated example shows a case where the setting value a is offset upward.

FIG. 3 is an explanatory diagram showing the contact state of the grinding body with the roll. When the grinding wheel rotation axis _OG is offset from the work roll axis _OR as described above, the workpiece on the tip surface of the grinding wheel 3 during grinding The contact part with the roll 1, that is, the grinding surface, is in line contact parallel to the work roll axis O _R as shown by m in the figure, and the center point C of the contact line m passes through the grindstone rotation center O _G and is connected to the roll axis O The position is shifted by an angle θ with respect to the straight line n parallel to _R. Note that during grinding, the work roll 1 rotates at a circumferential speed V _R , the grindstone 3 rotates at a circumferential speed V _G , and a relative sliding speed of V _S is generated between the grindstone 3 and the work roll 1.

Next, the frame 9 is moved by the operation of a pair of cylinders 14 attached to both side walls 13a of the frame support stand 13, so that a pair of protruding members 9 on the upper part of the frame 9
By pressing b, the frame support stand 13
The work roll can reciprocate in the axial direction H along the guide groove 13c of the work roll. Moreover, the frame support stand 13 is
It is connected to a pair of elevating devices, such as electric screw jacks 16, attached to the support beam 15 via a pair of brackets 13d protruding from both sides of the rear wall 13b, and is attached to the rear wall 13b in the vertical direction. The support beam 15 is provided so as to be movable up and down along the guide groove 15a of the support beam 15 by an extended guide member 13e.

The lifting device 16 includes a drive motor 17 and a drive shaft 1
The motor 17 is connected to the output side of the computing unit 19. Arithmetic unit 19
In this step, the roll reduction signal 20 and work roll diameter 21 of a roll gap setting device (not shown) are input, the required lifting amount of the grindstone 3 is calculated and output, and the jack 16 is driven by the motor 17 based on the output signal. do.

A guide member 22 for guiding the support beam 15 is fixed to the housing 23 of the rolling mill, and a moving cylinder 24 is connected to the support beam 15 in order to move the grinding device when changing rolls, etc. has been done.

In the apparatus of the embodiment described above with reference to FIGS. 1 and 2, the shafts 4 of the grinding wheels 3 are arranged horizontally, but in this case, chattering vibrations of the grinding wheels 3 are likely to occur due to grinding resistance during grinding. Therefore, as shown in FIG. 4, it is desirable to mount the shaft 4 at an appropriate angle upward or downward with respect to the horizontal. The illustrated example is mounted upward by an angle β.

On the other hand, although not shown in the drawings, regarding the grinding device for the lower work roll, the grinding wheel 3 is arranged such that the contact portion m of the grinding wheel 3 with the lower work roll is located above the rotation center of the grinding wheel 3, contrary to the case of the upper work roll 1. axis 4
The structure is the same as that of the upper work roll, except that the lower work roll is offset downward from the axis of the lower work roll and is mounted at an appropriate angle β' downwardly with respect to the horizontal, so a description thereof will be omitted.

To grind a roll with the apparatus of the present invention having the above configuration, first, the grindstone 3 is raised and lowered by the jack 16, and its rotation axis _OG is aligned with the work roll 1 axis.
After offset O _R upward or downward to a required set value a, the grindstone 3 is pressed against the work roll 1 rotating at a predetermined circumferential speed V _R with a predetermined set pressure by the pressing device 8. while reciprocating in the direction of the roll axis. Then, the roll surface is ground according to the relative sliding speed V _S between the grindstone 3 and the work roll 1, while the grinding surface always maintains the linear contact m. here,
The ratio of the rotating circumferential speed V _G of the grinding wheel 3 to the relative sliding speed V _S is determined by adjusting the inclination angle so that the angle θ becomes the optimum value based on the circumferential speed V _R of the work roll 1, the grinding efficiency of the grinding wheel 3, the frequency of clogging, etc. Set α and offset amount a.

On the other hand, the position of the grinding surface m of the grinding wheel 3 changes due to the gradual decrease in the roll diameter due to grinding and the fluctuation of the roll gap due to the change in the thickness of the rolled plate material 25. It is necessary to accurately set the grinding position, that is, the offset amount a, by moving the machine 3 up and down and back and forth with respect to the roll surface.
A roll reduction signal 20 and a work roll diameter 21 from a roll gap setting device (not shown) are input to 9, and the jack 16 is raised and lowered based on the output signals, and the pressing device 8 is operated to press the grindstone 3.
By pressing the grinding wheel 3 against the work roll 1, the grinding wheel 3 can be automatically set at an accurate predetermined grinding position.

The present invention has been described above with reference to one embodiment, but
The present invention is not limited to these embodiments, and various design modifications may be made without departing from the technical idea of the present invention.

<Effects of the Invention> When the roll grinding device of the present invention is used, the grinding body is rotated by the rotation of the roll, so that the surface of the grinding body that comes into contact with the roll surface is constantly refreshed and clogging does not occur. Furthermore, since there is no need for a rotation drive device for the grinding body, the structure of the device becomes simple. Furthermore, the position of the grinding surface of the grinding body can be automatically and accurately set by following changes in the roll diameter and roll gap. As described above, the present invention greatly contributes to improving the efficiency of online roll grinding operations and reducing equipment costs.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the rolling roll grinding device of the present invention, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, and Fig. 3 shows the contact state of the grinding body with the roll. An explanatory diagram, FIG. 4 is an explanatory diagram when the rotation axis of the grinding body is inclined with respect to the horizontal, and FIGS. 5 and 6 are explanatory diagrams of a conventional rolling roll grinding method. In the drawing, 1 is a work roll, 3 is a grindstone, 4 is a shaft, 6 is a grindstone holder, 8 is a pressing device, 9 is a frame, 13 is a frame support stand, 16 is a jack, 1
7 is a motor, 19 is a computing unit, and 25 is a rolled plate material.

Claims (1)

[Claims] 1. A frame is provided so as to be movable back and forth in a direction parallel to the axis of the roll, and within this frame, a grinding body holder that rotatably holds a grinding body whose tip end surface is pressed against the surface of the roll is installed along the axis of the roll. In addition to providing a plurality of grinding bodies, the grinding body holder is equipped with a pressing device that tilts the rotation center axis of the grinding body in the direction of the roll axis with respect to a direction perpendicular to the axis of the roll, and further presses the tip end surface of the grinding body against the surface of the roll, A rolling roll grinding device characterized by being provided with an elevating drive device that raises and lowers a frame in response to changes in the center height of the roll determined by changes in the vertical direction of the roll and in the diameter of the roll.