JPS61202709A - Grinding method of rolling roll - Google Patents

Abstract

PURPOSE:To prevent the loadings of a grinding wheel and to stabilize grinding operation over a long period of time by grinding a rolling roll, while moving a grinding wheel so that the wheel is always in linear contact with the roll surface to be ground, in case of grinding the rolling roll in on-line. CONSTITUTION:A rolling roll 1 is ground by a grinding wheel 2 to flatten a step difference produced on the surface of roll 1. the roll 1 surface is ground by pressing the wheel 2 against the surface of rotating roll 1 under a prescribed pressure, and vertically rocking a frame 4 incorporating a grinding-wheel holder 3 by the cooperation of a plunger 10a and a spring 9 with the aid of a hydraulic cylinder 10 as well as reciprocating the frame 4 in the roll-axis direction by a reciprocation driving device 13. The rocking speed of wheel 2 is regulated to two stocks or more with respect to one stroke of traversing. That is, the ratio of the rocking speed of wheel 2 to the traversing speed is made larger, and the contacting area between the front tip 2a of wheel 2 and the roll 1 surface is made small, to keep the area close to the linear contact, in order to move the wheel 2 for the purpose of preventing the loadings of wheel 2 by always grinding the wheel 2 with a new surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for grinding a roll, particularly an online roll grinding method.

Prior art and problems In recent years, for example, in metal plate rolling machines such as hot rolling mills,
In order to deal with step wear on the work roll caused by changes in the width of the rolled material, the surface of the work roll is ground to a desired profile while it is still installed in the rolling mill stand.
Various so-called online roll grinding methods have been proposed.

A typical example is a method in which a grinding body such as a block-shaped grindstone is held in a grindstone holder and pressed against the surface of the roll while rotating the work roll, and the grinding body is reciprocated parallel to the roll axis to perform grinding. In this case, the roll-opposing portion of the grinding wheel tip surface wears out as grinding progresses, and eventually its entire surface comes into contact with the roll surface. When this happens, clogging occurs on the tip surface of the grinding wheel, reducing grinding performance.

Therefore, as a means to prevent such clogging, a grinding method disclosed in Japanese Unexamined Patent Publication No. 14010/1983 has been proposed. This method involves reciprocating the whetstone group in the direction parallel to the roll axis and reciprocating in the roll rotation direction at the same time to keep the front grinding wheel surface in contact with the part being ground by the roll to prevent clogging. That is.

However, with this method, the grinding wheel is pressed against the roll surface while making a synthetic reciprocating motion, that is, moving diagonally with respect to the roll axis, so the tip surface of the grinding wheel is pressed against the roll surface in addition to the required force, which corresponds to the arc of the roll. This fluctuating and repeated pressing does not result in localized reaction force, which poses a problem in that the grindstone is easily damaged.

Means for Solving the Problems> The rolling roll grinding method of the present invention, which has been made to solve the above problems, uses a grinding body that has a grinding body attached to its tip and a pressing mechanism that presses the grinding body against the roll at its rear. A plurality of holders are arranged in the roll axis direction within a frame, and the frame is supported so as to be movable reciprocally in parallel to the roll axis direction by a traverse drive mechanism and rotatable in forward and reverse directions with respect to the rotation direction of the MiJ roll. A rolling roll grinding method using an online roll grinding device comprising a support base for rotating the frame, and a rotating IB mechanism for the frame, the grinding bodies being pressed against the roll surface being individually aligned with each other in the direction of rotation of the roll. In the case of rocking in the opposite direction, grinding is performed by reciprocating in parallel to the roll axis and setting the rocking speed of the grinding body to be 2 strokes or more per 1 stroke of the reciprocating speed in the roll axis direction. It was designed to do this.

According to the method of the present invention configured as described above, grinding is performed by pressing a grinding body such as a whetstone against the roll surface with a predetermined pressure and swinging it while reciprocating in the direction of the roll axis. .

At this time, the swinging speed of the grinding body is set so that it is at least 2 strokes per 1 stroke of reciprocation in the direction of the low A axis.
Set to high speed. Since the oscillation speed is higher than the reciprocating speed, that is, the traversing speed, the tip of the grinding body moves while maintaining a state close to linear contact with the roll surface, and grinding is constantly performed with a new grinding surface. , the roll surface can be continuously ground without clogging the grinding body.

<Example> Hereinafter, an example of the method of the present invention will be described in detail based on the drawings.

FIG. 1 is a side view of an online roll grinding device used in the rolling roll grinding method of the present invention, and FIG.
A plan view as viewed from arrow A and FIG. 3 are illustrations of the grinding operation.

As seen in the figure, the frame 4 that houses the grindstone holder 3 is pivoted on the guide rod 5 of the support base 6 so that it can rotate vertically and reciprocate in parallel to the axial direction a of the roll 1. ing. Further, the lower part of the frame 4 on the roll side is mounted and supported on a support block 8 that fits into a pair of guide grooves 7 provided in a protrusion 6a of the support base 6 so as to be able to move up and down. The top surface of the support block 8 has an arc shape as shown in the figure.
Each of them is supported on the protrusion 6a of the support base 6 via two elastic bodies such as springs 9.

On the other hand, the lower part of the frame 4 on the anti-roll side is connected to the hydraulic cylinder 1.
0 blunt gloss 10a and the support stand 6 via the roller 11
supported above. By controlling the working fluid of the hydraulic cylinder 10 on and off by a pilot pulp of a hydraulic control system (not shown), the first run gear 10a cooperates with the spring 9 to move the frame 4 around the axis of the guide rod 5. The maximum stroke of one langeer 10a is determined so as to swing downward through a predetermined angle θ, that is, in the forward and reverse directions with respect to the roll rotation direction C.

Furthermore, an accumulator (not shown) is provided in the working hydraulic pressure line 12 of a hydraulic cylinder (not shown) for driving the grinding wheel holder 3 in and out, so that the pressing force of the grinding wheel 2 can be kept constant. . Note that the reciprocating movement of the frame 4 in the roll 1 axis direction is performed by a reciprocating drive device 13 such as a hydraulic cylinder.

When grinding a roll by the method of the present invention using the grinding device configured as described above, the hydraulic cylinder 10 is pressed with the grindstone 2 pressed against the surface of the rotating roll at a predetermined set pressure. Let's make 7 lan soya 10 as mentioned above
A The frame 4 is swung up and down by the cooperation of the spines 9, and the reciprocating drive device 13 is driven to reciprocate in one axis direction of the roll, that is, to move it horizontally. As the frame 4 swings and traverses, the grindstone 2 swings and traverses while in contact with the roll surface, thereby performing grinding.

In this case, the swinging speed of the grindstone 2 is set to an arbitrary speed at which the swinging speed is two or more strokes per one horizontal stroke, but it is desirable to set it as high as possible. That is, as the ratio of the swinging speed to the traversing speed increases, the contact area of the grinding wheel tip 2a with the surface of the roll 1 becomes smaller, and the grinding wheel 2 moves on the surface of the roll 1 while maintaining a state close to linear contact. Therefore, grinding can be performed constantly with a new grinding surface of the grinding wheel, and clogging of the grinding wheel surface can be prevented. .

Here, since the grindstone tip 2a moves up and down on the arc of the roll 1 while being fixed at an arbitrary set pressure, the grindstone 2, together with the holder 3, must move forward in the direction indicated by the arrow in the figure. 't
That is, when the grinding wheel 2 rises from the lower limit position shown by the solid line in FIG. Although it is necessary to move backward by the stroke, as described in Moe's work, the hydraulic cylinder for driving the grinding wheel holder 3 needs to be
The pressure pipe line 12 is provided with an accumulator, and the movement stroke Svc is increased by the action of this accumulator.
Corresponding liquid.

There is no problem because it can be controlled completely automatically.

The above explanation has been made regarding the case where the method 1 of the present invention is implemented using the apparatus 11tt illustrated in FIGS. It is not something that is done, but it is something that can be used as a gift to any other device that has a similar Isoi [i].

<Effects of the Invention> As is clear from the above explanation, if the method of the present invention is used, the grinding wheel and the roll surface always move in linear contact, so clogging of the grinding wheel is completely prevented and grinding performance is improved. Not only can it hold ω1 continuously without interrupting grinding.
Since the entire grinding process can be carried out, and the tip of the grinding wheel always receives uniform contact pressure, it has the advantage of being able to reduce the number of cuts, such as preventing the grinding wheel from breaking, which occurs in the conventional method.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of an online roll grinding device used in the rolling roll grinding method of the present invention, and FIG.
A plan view taken along arrow A-A in the figure, and FIG. 3 is an explanatory diagram of the operation of the grinding device. In the box, 1 is the roll, 2 is the whetstone, 3 is the whetstone holder, 4 is the frame, and 5 is the plan FF3? ! J, 6 is a support base, 9 is a spring, 1 () is a hydraulic cylinder, 12 is an operating hydraulic snow road, and 13 is a reciprocating drive device. Patent/Applicant Mitsubishi Heavy Industries, Ltd. Kaya Patent Attorney Former Ishibe Shibu (and 1 other person) Figure 2 Figure 3

Claims (1)

[Claims] A plurality of grinding body holders with a grinding body attached to the tip and a pressing mechanism at the rear for pressing the grinding body against the roll surface are arranged in a frame in the direction of the roll axis, and the frame is moved parallel to the roll axis by a transverse drive mechanism. A rolling roll grinding method using an online roll grinding device comprising: a support base that supports the roll so that it can reciprocate and rotate in forward and reverse directions with respect to the rotational direction of the roll; and a rotation mechanism for the frame. A grinding body pressed against the roll surface is oscillated in forward and reverse directions with respect to the roll rotation direction and reciprocated parallel to the roll axis, and the oscillation speed of the grinding body is set to a reciprocating speed in the roll axis direction. A rolling roll grinding method characterized in that grinding is performed by setting the dynamic speed to be two or more strokes per one stroke.