JPS61140312A - Grinding device for rotating body - Google Patents

Abstract

PURPOSE:To obtain an on-line grinding device, simple in construction, low in cost and excellent in grinding performance, by forming the device with a grinding wheel, rotated freely together with a rotating body to be ground by pressing the body against it, and a hydraulic motor for controlling the number of revolutions of the wheel. CONSTITUTION:The axis of a cup-shaped grinding wheel 35 is inclined at an angle theta to the line perpendicular to the axis of a work roll 1 of rolling mill. Accordingly, when the wheel 35 is pressed against the work roll 1 in grinding the roll 1, the wheel 35 contacts the roll 1 partly, and is driven by the roll 1. At that time, as the surface of roll 1 is not efficiently ground by only rotating the wheel 35 synchronously with the rotation of roll 1, a hydraulic motor 12 is connected to the rotational axes 11 of wheel 35. Further, the pipings of inlet and outlet sides, through which a fluid flows into or out of the motor 12, are directly connected to the motor 12 through a flow regulating valve 15, to form a closed loop across the motor 12. Accordingly the fluid in the motor 12 is expelled to the outlet side by the rotating wheel 35, but the rotation of wheel 35 is regulated by the damping function of motor 12, produced by throttling the flow of fluid by adjusting the opening of valve 15.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a grinding device for grinding a rotating object.
It is particularly suitable for use in online grinding of work rolls in rolling mills such as hot rolling mills.

<Prior art> In hot rolling mills that perform EE rolling of steel plates, etc., the wear of work rolls during rolling is much greater than that of /J rack-up rolls, especially at the threading part of the work rolls where the strip comes into contact. The surface is severely rough, and there is a tendency for local wear to be large in areas corresponding to the side edges of the strip. For this reason, when rolling strips, the rolling order starts with wide strips and then moves to narrow strips, and the rolls are replaced periodically to remove worn rolls from the rolling mill. After being ground outside, it was put back into the rolling mill for use.

However, in this method of performing squesoille rolling and grinding the rolls off-line, the rolling order is restricted, which hinders production efficiency, and the rolls must be replaced frequently, which requires a great deal of labor. Moreover, it was a major factor in reducing the equipment operating rate. Therefore, progress has been made in the development of an online grinding device that grinds the rolls during rolling while the rolls are still installed in the rolling mill, extending the roll replacement cycle and enabling rolling operations where the rolling order is not restricted by strip width. I came.

Conventionally known on-line grinding devices include the types shown in FIGS. 4 to 4-v. In the one shown in Figure 1, a prismatic Glock-shaped grindstone 31 is pressed against the rotating work roll 1 for grinding. In the fifteenth figure, a disc-shaped grindstone 32 is rotated by a motor and is pressed against the surface of the rotating work roll 1 for grinding.

In the one shown in Figures 1 and 2, an endless belt-shaped grindstone 33t wrapped around a pair of rotating pulleys 6 is pressed against the surface of a rotating work roll 1 to perform grinding. The one shown in figure ``7'' is a cup-shaped whetstone 3.
Grinding is performed by pressing the end face of the grinding wheel 4 against the coating surface of the rotating work roll 1. In this type, it is easiest and cheapest to drive the grindstone shaft 7 with a fluid motor (not shown); Air or liquid pressure fluid is supplied through piping from a pressure fluid supply source such as a compressor or a pump (not shown).

<Problems to be Solved by the Invention> In the case of using the prismatic Glock-shaped grindstone 31 shown in FIG. 4, there is no need to rotate the grindstone 31, so the device is simple. Grinding wheels 3 and 1 tend to become clogged with grinding powder or burnt out, and since the grinding wheels 3 and 1 are prismatic, their corners are damaged, resulting in a short service life and a tendency to cause accidents. .

The disk-shaped grindstone 32 shown in Figure No. 1 and S+1 has a long life and good grinding performance. However, since the grindstone 32 must be rotated, it is necessary to rotate the grindstone shaft 4 provided on the side surface of the grindstone 32 by a motor (not shown).

Therefore, a large space is required along the longitudinal direction of the roll, and when a plurality of grinding stones 32 are arranged, the distance between adjacent grinding stones 32 must be set large, and the distance between adjacent grinding stones 32 must be set large. The drawback is that it is not possible to grind the entire surface.

The disadvantage of using the belt-shaped grindstone 33 shown in FIG. 161 is that the grindstone 33 is easily clogged and easily cut, making the entire device complicated.

On the other hand, in the case of using the cup-shaped grindstone 34t shown in Fig. 17, since the grindstone 34 rotates, there is no clogging (1) and the grinding performance is good. Also, since the grindstone 34 is cup-shaped, the angle between the grindstone 34 and the roll is smaller than that of a disc-shaped one.
Since the contact area is very small, the force of pressing the grindstone tends to be very small. Incidentally, it has been found that the force required for pressing this grindstone is approximately 1/20 to 1/30 of that in the case of the prismatic/Glock-shaped grindstone 31 shown in the above-mentioned figure. Furthermore, since the grinding wheel shaft 7 is provided in the direction perpendicular to the roll axis compared to the one using the disc-shaped grinding wheel shown in Fig.
Although the structure is simple and the space is small, the pressure fluid supply source for driving the fluid motor and the driving means such as piping become complicated.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of conventional online grinding devices as described above, and to provide an online grinding device that has a simple structure, low cost, and excellent grinding performance.

Means for Solving the Problems> The rotating body grinding device of the present invention includes a grindstone that is pressed against the surface of a rotating workpiece and rotates together with the grindstone, a fluid motor connected to the rotating shaft of the grindstone, It consists of a flow rate control means in the form of a closed loop connecting the inlet and outlet sides of the fluid motor.

Effect> The grindstone rotates due to friction with the rotating surface of the workpiece. Then, by adjusting the opening degree of a flow rate control means such as a flow rate control valve provided in the middle of the fluid pipe forming the closed loop, the rotation speed of the fluid motor and therefore the grinding wheel is controlled, and the contact surface between the surface of the workpiece and the grinding wheel is controlled. Grinding is performed by creating sliding friction based on the speed difference between the two.

<Embodiment> As shown in FIG. 1 showing the concept of an embodiment of the present invention, the present device includes a cup-shaped grindstone 35, a fluid motor 12 connected to a rotating shaft 11 of the grindstone 35, and a fluid An inlet pipe 13 and an outlet pipe 14 of the motor 12, and a fluid control valve 1 provided between the inlet pipe 13 and the outlet pipe 14.
5. A pressure fluid supply source is not connected to the fluid motor 12, so the grindstone 35 is not rotationally driven by the fluid motor 12, but is pressed against the roll surface, which will be described later, and rotated by the frictional force accompanying the rotation of the roll. .

Although the grindstone 35 is cup-shaped in this example, it is not limited to the cup-shape, and may be in the shape of a disk, a truncated cone, or the like.

An inlet pipe 13 through which fluid enters the fluid motor 12 and an outlet pipe 14 through which fluid exits are directly connected via a flow rate control valve 15, forming a closed loop with the fluid motor 12. A fluid such as hydraulic oil is pre-filled in the grinding wheel 35. As shown in FIG. As such, the grindstone axis is set at an angle θ with respect to a line perpendicular to the roll axis. Therefore, when the work roll 10 rotation 35 rotating during grinding is pressed against the grindstone 35, the grindstone 35 rotates as the work roll 1 rotates. In this case, if the grinding wheel 35 only rotates in synchronization with the 10 rotations of the work roll, it is not possible to efficiently grind the optical surface of the roll 1, but by operating the flow control valve 15, the grinding wheel 350 and the workpiece A speed difference is generated between the roll 1 and the surface of the roll 1, and friction is generated on the roll surface, resulting in grinding.

That is, the grindstone 35 rotates driven by the work roll IVc.
As a result, the fluid in the fluid motor 12 tries to flow out to the outlet side, but the opening degree of the fluid control valve 15 provided between the outlet pipe 14 and the inlet pipe 13 is adjusted to provide a throttling action. This makes it difficult for the fluid to flow, creating pressure within the outlet pipe 14. This pressure causes the fluid motor 15 to have a braking function, providing resistance to the rotational force of the grindstone 35 and regulating its rotation.

As shown in FIG. 3, which shows the relationship between the opening degree of the flow control valve 15 and the rotation speed of the grindstone 35 according to this embodiment, the flow control valve 15
The number of rotations of the grindstone 35 decreases as the grindstone 35 is closed. From this, it is sufficient to determine the grindstone 350 rotation speed for optimal grinding.

It has been experimentally confirmed that although the grinding wheel wear rate and grinding speed increase as the grinding wheel rotation speed decreases, the grinding ratio, which is the ratio of roll grinding wear to grinding wheel wear, remains constant. υ, since the grinding ratio is constant, the grinding wheel rotation speed can be determined according to the grinding conditions (grinding time, grinding 1, grinding wheel wear amount) at that time based on the relationship between the grinding speed and the grinding wheel wear rate, and this rotation speed This control is performed by the opening adjustment button of the flow rate control valve 15 mentioned above.

<Effects of the Invention> According to the present invention, it is possible to perform online grinding of a roll using only a combination of a fluid miller connected to a grinding wheel shaft, its closed loop piping, and a flow control valve, and a special grinding wheel driving source is not required. Since the equipment does not require much space, equipment costs are low and space is required, making it a great contribution to the rolling industry.

It goes without saying that the present invention is widely applicable not only to the grinding device for rolling mill rolls as described above, but also for grinding other rotating bodies.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing an embodiment of a rotating body grinding device according to the invention, and Fig. 2 is a conceptual diagram showing the contact situation between the grinding wheel and the roll.
FIG. 3 is a graph showing the relationship between the opening degree of the flow control valve and the rotational speed of the grinding wheel, and FIGS. 4 to 7 are conceptual diagrams showing the schematic structure of a conventional grinding device. , in the drawings, 1 is a work roll, 11 is a grindstone rotating shaft, 12 is a fluid motor, 13 is an inlet pipe, 14 is an outlet pipe, 15 is a flow control valve, and 35 is a grindstone. Figure 1 *2f! f 3rd CI JI4f! ! : Round 14 opening lock □ Closed 5th Jm Figure 6 7m

Claims (1)

[Claims] A grindstone that is pressed against the surface of a rotating workpiece and rotates together with the grindstone, a fluid motor connected to a rotating shaft of the grindstone, and a fluid pipe that forms a closed loop connecting an inlet side and an outlet side of the fluid motor. , and a flow rate control means interposed in the middle of the fluid piping.