JPH0459044B2 - - Google Patents

Description

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

Conventionally, in plate rolling mills such as hot rolling mills, work rolls are locally worn only in the parts that come into contact with the rolled material, so in order to roll plates with a normal thickness distribution, the rolling order of the rolling mill must be changed from wide to wide. Move to narrower width. A so-called schedule rolling method is generally employed. However, in this rolling method, the process plan 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 an increasing demand to abolish such 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 in the direction (perpendicular to the plane of the paper in the figure). Further, FIG. 2 shows another example, in which a rotating grinding body 2' is pressed against the 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.

Among these conventional examples, in the case of the example shown in Fig. 1,
The structure is simple because there is no rotating drive device for the grinding body 2 such as a grindstone, but since the grinding surface of the grinding body 2 is always the same surface, 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, but on the other hand,
Since a rotary drive device (not shown) for the grinding body 2' is required, the structure is complicated and there is a drawback that a large amount of equipment cost is required. In this way, all conventional methods have their 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.

In the roll grinding method for a rolling mill of the present invention, a grinding body such as a rotatable grindstone is pressed against the surface of the roll such that its rotational axis intersects the axis of the roll to be ground at a predetermined angle, and the roll axis This method is characterized in that the roll is rotated while being moved in parallel to the grinding body, and the roll surface is ground by relative sliding due to the circumferential 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 rotation drive device and rotates as the roll rotates by being pressed against the roll surface, but the rotation axis is parallel to the roll axis. Therefore, relative slip occurs between the circumferential movement of the grinding body and the roll,
This grinds the surface of the roll.

Embodiments of the present invention will be described below based on the drawings. FIG. 3 is a perspective view showing the method according to the present invention;
FIG. 4 is an explanatory diagram of the principle of the method according to 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 grinding body 3 is rotatably supported on a support base (not shown) such that its rotation axis Y intersects the axis X of the roll to be ground 1 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 is moved parallel to the roll axis X. It can move parallel to the center X.

With the above configuration, the roll to be ground 1 installed in the rolling stand (online) can be moved at a circumferential speed.
The grinding body 3 is rotated by V _R (normally idling operation by the rolling mill drive device) and the roll 1 to be ground is rotated.
When pressed against the surface, the grinding body 3
Rotates according to the rotation of. At this time, the roll axis
Since and the grinding body axis Y intersect at an angle θ, as shown in Fig. 4, the grinding body circumferential speed V _G is smaller than the roll circumferential speed V _R and is relative to the grinding body axis Y direction. Causes slippage V _S. Here, grinding body 3
is pivotally supported on the support base so that it cannot move in the direction of its axis Y, so the relative slippage
The surface of the roll to be ground 1 will be ground according to V _S. The grinding body 3 is the moving device (feeding device)
Since it can be moved parallel to the roll axis X, 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, clogging does not occur on the surface of the grinding body as in the conventional example shown in FIG. Unlike the conventional example, 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 the above description, the present invention was mainly applied to grinding work rolls of a rolling mill, but the present invention is not limited to this, and is applicable to pack-a-pu rolls and other rolls, For example, it can be fully applied to online grinding of pinch rolls, table rolls, etc.

[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.

Claims (1)

[Claims] 1. Grinding by pressing a rotatable grinding body against the surface of the roll such that its axis of rotation intersects the axis of the roll to be ground at a required angle, and rotating the roll while moving it parallel to the axis of the roll. A roll grinding method for a rolling mill characterized by grinding the roll surface by relative sliding due to the circumferential speed of the body and the roll.