JPS61245907A - Grinding method for rotating body - Google Patents

Abstract

PURPOSE:To prevent easily the loading of a grinding body and the chipping accident of a corner part by stopping the rotation of the cylindrical grinding body moving in parallel with the axial line of a rotating body, pressing the grinding body to the rotating body, grinding the rotating body and rotating the grinding body at a small pitch in the non-grinding stage. CONSTITUTION:The cylindrical grinding body 3 is locked by an intermittent feed device 4a to stop the rotation of said body. A grinder holder 4 is advanced by a pressing device equipped in a supporting frame 5 to press the body 3 toward the outside peripheral surface of a rotating work roll 1 of a rolling mill; further the above-mentioned frame 5 is moved back and forth on a guide beam 6 and the roll 1 is online ground. The body 3 is retreated from the roll 1 surface when the body 3 wears nearly to the region where loading arises. The device 4a is then unlocked and the body 3 is rotated at the optional pitch relatively small with respect to the outside peripheral length thereof. The grind ing body is again locked and is advanced to resume grinding.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for grinding a rotating body such as a roll, and particularly to a grinding method suitable for use in online roll grinding of a rolling mill.

<Prior art> In a rolling mill such as a hot rolling mill, in order to improve production efficiency and improve the quality of rolled products, a grinding device is attached to the rolling mill to improve the U-ru surface during rolling work. Various online roll grinding methods have been developed and are being put into practical use.

Figure 2 shows an example of such a conventional online roll grinding means, in which the work flow of a rolling mill is /L/lt-
The surface of the work roll 1 is ground to a desired profile by pressing a grinding body 2 such as a non-rotating grindstone against the surface of the work roll 1 while rotating and moving it in the roll axis direction, that is, in a direction perpendicular to the plane of the paper. . In addition, Fig. 3 shows another example, in which the circumferential surface of a cylindrical grinding body 30 rotating at a circumferential speed vG lower than the circumferential speed ■8 of the rotating work roll 1 is attached as in the case of the previous example. This is a method in which grinding is performed by pressing against the roller and moving it in the direction of the roll axis.

<Problems to be Solved by the Invention> In the conventional example shown in FIG. Since the surface of the body 2 is always the same surface, there is a drawback that clogging occurs on the surface and the grinding performance deteriorates. Furthermore, since the grinding body 2 in this case is usually a square block-shaped grindstone, there is also a drawback that the corner portion 2a of the grinding body 2 is likely to be damaged due to grinding resistance or the like.

On the other hand, in the example shown in Fig. 3, since the grinding body 3 rotates, a new grinding surface comes into contact with the work roll 1 in the middle of the grinding process, which prevents clogging of the surface of the grinding body 3 and maintains grinding performance. At the same time, there is an advantage that the corner chipping accident as in the case of the square block-shaped grindstone described above does not occur.

However, in this case, since a drive device (not shown) is required to rotate the grinding body 3, the structure of the grinding device becomes complicated and the equipment cost increases.

As described above, all of the conventional online grinding methods have advantages and disadvantages1)9, but the reality is that no grinding method has yet been developed that can achieve sufficient grinding performance using equipment with a simple structure. . In view of the current situation, the present invention aims to provide a rational rotary body grinding method that eliminates the drawbacks of the conventional methods as described above.

Means for Solving the Problems> The method for grinding a rotating body of the present invention involves pressing the circumferential surface of a cylindrical or cylindrical grinding body against the outer circumferential surface of the rotating body, and also pressing one of the grinding bodies against the axis INK of the rotating body. In a method of grinding a rotating body by moving it parallel to the grinding body, the rotation of the grinding body is stopped during grinding, and when not grinding, the grinding body is moved around the circumference at an arbitrary pitch that is relatively small with respect to its outer circumference length. It is characterized by rotating in the direction.

Effect> In the method for grinding a rotating body of the present invention, when grinding is performed by pressing the circumferential surface of the grinding body against the outer circumferential surface of the rotating body while rotating the rotating body, the grinding body is not rotated and the rotating body is Grind by moving in the axial direction. As the grinding progresses, the contact surface of the grinding body with the rotating body wears out and approaches the clogging area, but
Immediately before reaching this area, the grinding body is separated from the rotating body to stop grinding, and the grinding body is rotated by a preset pitch,
Grinding is performed by bringing the grinding body into contact with the rotating body again. In this way, the grinding body is rotated by one pitch just before clogging occurs, and grinding is carried out by constantly contacting the rotating body with a new grinding surface, thereby maintaining the required grinding performance over a long period of time.

Embodiments The method of the present invention will be explained in more detail below based on the embodiment shown in FIG. The figure is a front view of an example of a grinding device used in the method of the present invention, viewed from the end direction of the roll shaft.

As shown in the figure, the grinding body 3, such as a cylindrical grindstone, can be rotated only in one direction, for example, in the opposite direction to the rotation direction a of the workpiece wheel 1, and has a locking function. The grinding body holder 4 is pivotally supported by a grinding body holder 4 having an intermittent □ feeding device 4a at its tip. The grinding body holder 4 uses a pressing device (not shown), such as a hydraulic cylinder, installed in the support frame 5, to press the circumferential surface of the grinding body 3 against the surface of the work roll 1 at an arbitrary set pressure, and also presses the circumferential surface of the grinding body 3 against the surface of the work roll 1 with an arbitrary set pressure. It can move forward and backward in the direction X perpendicular to . Also, the support frame 5
The wrinkle crawler can be moved along a guide beam 6 attached to a rolling mill housing or a base (not shown) in one axial direction of the wrinkle crawl, that is, in a direction perpendicular to the plane of the paper, by a moving device (not shown). There is.

When attempting to grind the work roll l of a rolling mill online using a grinding device having such a configuration, first, the locking mechanism of the intermittent feeding device 4a of the grinding body 3 is activated to lock 30 rotations of the grinding body. The circumferential surface of the grinding body 3 is pressed against the surface of the rotating work roll 10 with an arbitrary set pressure by a suppressing device, and the grinding body 3 is moved q- by a moving device.
Grinding is performed by reciprocating in the axial direction.

Thus, as the grinding operation progresses, the roll contact surface, that is, the grinding surface of the grinding body 3 wears out and approaches a region where clogging occurs. Immediately before reaching this area, the grinding body 3 is retreated from the surface of the work roll 1, and after releasing the locking mechanism of the intermittent feeder 4&, the grinding body 3 is
Rotate and lock again and grind the grinding body 3 according to the flat head.
Move forward and re-grind. Thereafter, the grinding body 3 is similarly rotated one pitch at appropriate intervals to continue grinding.

In this way, the grinding surface of the grinding body 3, which grinds the surface of the work roll 1 without rotating, is rotated and refreshed before reaching the clogging area, so that it is always maintained at a predetermined level without causing clogging. Grinding can be continued while maintaining grinding performance.゛Here, the rotation pitch of the grinding body 3 is a value that is relatively smaller than the outer circumferential length of the grinding body 3, for example, the diameter of the grinding body 3 is 2.
In the case of 00-, the pitch is approximately 10- and an appropriate value is selected that is not divisible by the outer circumferential length. By doing so, even if the grinding body 3 rotates over 360 degrees, the same grinding surface does not come into contact with the surface of the work roll 1, and it is possible to always perform grinding with a new grinding surface.

Furthermore, the setting of the rotation pitch dimension of the grinding body 3 and the limit of grinding possible without causing clogging on the same grinding surface, that is, one grinding until grinding is interrupted and the grinding body 3t is rotated. The time can be set to an optimum value by conducting experiments in advance, depending on the material of the work roll 1 to be ground, the pressing force and dimensions of the grinding body 3, grinding efficiency, clogging resistance, etc.

(Effects of the Invention) As is clear from the above explanation, by using the grinding method of the present invention, accidents such as clogging and chipping of the corner parts do not occur as in the conventional method of grinding the grinding surface of the grinding body. In addition, since a complicated grinding body rotation drive device is not required, the structure of the grinding device is simple, which greatly contributes to improving the efficiency of the grinding device and reducing equipment costs.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a grinding apparatus for implementing the rotary body grinding method of the present invention, and FIGS. 2 and 83 are diagrams illustrating a conventional rotary body grinding method. In the drawing, l is a work roll, 2 and 3 are grinding bodies, 4 is a grinding body holder, 4a is an intermittent feeder, 5 is a support frame, 6
is the guide beam.

Claims (1)

[Claims] A method of grinding a rotating body by pressing the circumferential surface of a cylindrical or cylindrical grinding body against the outer circumferential surface of a rotating body and moving the grinding body parallel to the axis of the rotating body. A method for grinding a rotating body, comprising: stopping the rotation, and rotating the grinding body in the circumferential direction at an arbitrary pitch that is relatively small with respect to its outer circumferential length during non-grinding.