JPS60213302A - Method for grinding roll of rolling mill - Google Patents

Abstract

PURPOSE:To eliminate the need for a driving device of grinding body and to simplify its construction by specifying the angle of a grinding body in case of rotating a roll, in an on-line roll-grinding method performed by pressing the rotating grinding-body against the roll surface. CONSTITUTION:A cylindrical grinding body 3, such as a whetstone, is pressed against the roll surface of a roll 1 to be ground. The body 3 is freely rotatably supported on a supporting bed so that its rotating axis Y intersects the axis X of roll 1 at an angle theta with respect to the axis X. Further, the supporting bed is moved parallelly to the axis X along a fixed guide beam. Accordingly, the body 3 can be moved parallelly to the axis X. Hereupon, when the body 3 is pressed against the roll 1 surface while rotating the roll 1 at a peripheral speed VR, the peripheral speed VG of the body 3 becomes smaller than the peripheral speed VR and a relative slip VS is produced in the Y-axis direction, because the body 3 rotates on its own axis but intersects the axis X at the angle theta. Here, as the body 3 is supported impossibly to move in the Y-axis direction, the roll 1 surface is ground in accordance with the slip VS.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for grinding a roll in a rolling mill, and particularly to an online roll grinding method in which grinding is carried out with the roll installed in a rolling mill stand.

Conventionally, in plate rolling mills such as hot rolling mills, work rolls suffer local wear only at the portions that come into contact with the rolled material.
In order to roll a plate with a normal thickness distribution, a so-called schedule rolling method is generally adopted in which the rolling order of a rolling mill is shifted from wide width to narrow width. However, in this rolling method, the process planning is regulated, which not only hinders the improvement of production efficiency but also has drawbacks such as an increase in the storage space for the rolled material (slab). There is a growing demand to abolish rolling order regulations.

As a countermeasure against this problem, various so-called online roll grinding means have been proposed in which the surface of the work roll is ground to a desired profile while the work roll is installed in a rolling mill stand. Representative examples include the following.

Figure 1 shows one example of this. In this example, while rotating the work roll 1, a grinding body 2 such as a non-rotating grindstone is pressed against the surface of the work roll 1 at right angles to the roll axis, and Grinding is performed by moving the machine in the direction (perpendicular to the plane of the paper in the figure). In addition, Fig. 2 shows another example, in which the rotating work roll 1
In this method, the rotating grinding body 7 is pressed in the same way as in the previous example, and the grinding body 7 is moved in the direction of the roll axis for grinding.

Among these conventional examples, the example shown in Fig. 1 has a simple structure because there is no rotation drive device for the grinding MtJ body 2 such as a whetstone, but the grinding surface of the grinding body 2 is always the same surface. It has the disadvantage that clogging occurs on the surface and the grinding performance deteriorates. On the other hand, in the case of the example shown in Fig. 2, since the grinding body 2 rotates, clogging of the surface can be prevented and grinding performance can be maintained. This has the disadvantage that the structure is complicated and requires a large amount of equipment cost. In this way, all conventional methods have advantages and disadvantages.

In view of the above points, it is an object of the present invention to provide a roll grinding method that can take advantage of the advantages of conventional techniques and eliminate the disadvantages.

The roll grinding method for a rolling mill of the present invention involves pressing a grinding body such as a grindstone that can freely rotate once against the surface of the roll such that its rotational axis intersects the axis of the roll to be ground at a required angle;
The method consists of rotating the roll and grinding the roll surface by the relative speed of the grinding body and the roll. That is, in the present invention, the grinding body such as a whetstone does not have a rotational drive device, and the grinding body such as a grindstone does not have a rotation drive device, and the
It rotates with the rotation of the roll, but since its rotation axis is not parallel to the roll axis, there is a gap between the circumferential movement of the grinding body and the roll, which causes grinding of the roll surface. It will be held.

Hereinafter, the present invention will be described in detail based on the drawings. FIG. 3 is a perspective view showing a method according to an embodiment of the present invention, and FIG. 4 is a diagram illustrating the principle of the method according to an embodiment of the present invention.

As seen in FIG. 3, a cylindrical grinding body 3 such as a grindstone is pressed against the surface of a roll to be ground (work roll) 1. The rotational axis Y of the grinding body 3 is aligned with the roll to be ground 1.
It is rotatably supported on a support stand (not shown) so as to intersect with the axis X at an angle θ. Further, the support base that pivotally supports the grinding body 3 is moved parallel to the roll axis X by a moving device (not shown) along a fixed guide beam (not shown), so that the grinding body 3
The μ roll axis can move parallel to the OXK 1. With the above configuration, the state (
When the grinding body 3 is pressed against the surface of the grinding roll 1 while rotating the roll 1 to be ground (on-line) at a circumferential speed vR (usually in shear idling operation by a rolling mill drive device), the grinding body 3
rotates according to the 10 revolutions of the roll to be ground. At this time, the roll axis X and the grinding body axis Y intersect with each other at an angle θ, so as shown in Fig. 4, the grinding body circumferential speed VG becomes smaller than the roll circumferential speed ■, and the grinding body axis A relative displacement (t) Vs is generated in the Y direction. Here, the grinding body 3 has its axis Y
The surface of the roll to be ground 1 is ground in accordance with the relative slide DVs because it is pivotally supported on the support stand so that it cannot be moved in the direction μ. Since the grinding body 3 can be moved parallel to the roll 111 center X by the moving device (feeding device), it can be moved to any desired location on the surface of the roll to be ground 1 and grinding can be performed freely.

As is clear from the above explanation, according to the method of the present invention, since the grinding body rotates, there is no clogging on the surface of the grinding body as in the conventional example shown in FIG. Unlike the conventional example shown in FIG. 2, there is no need for a rotational drive device for the grinding body, so the structure is extremely simple even if a feeding device is included. Therefore, it greatly contributes to improving the efficiency of grinding work and reducing equipment costs.

In addition, in the above explanation, the case where the present invention is applied mainly to grinding of work rolls of a rolling mill has been described.
The application of the present invention is not limited to this, but can also be fully applied to online grinding of other rolls such as backup roll grinders, such as pinch rolls and table rolls.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams illustrating a conventional online roll grinding method, FIG. 3 is a perspective view illustrating an embodiment of the method of the present invention, and FIG. 4 is an explanatory diagram of the principle of the method of the present invention. In the drawings, 1 is a roll to be ground, and 3 is a grinding body. Patent Applicant: Mitsubishi Heavy Industries, Ltd. Sub-Agent Patent Attorney: Shibu Mitsuishi (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A freely rotatable grinding body is pressed against the surface of the roll such that its rotational axis intersects the axis of the roll to be ground at a required angle, and the roll is rotated to calculate the relative displacement pK due to the circumferential speed of the grinding body and the roll. A method for grinding rolls in a rolling mill, which comprises grinding the surface of a roll.