JPH04105863A - Roll grinding method - Google Patents

Abstract

PURPOSE:To secure a desired roll profile in an accurate manner by moving a grindstone in a roll turning centering direction as far as a deviation portion between a roll diameter measured value and a stone's desired moving curve and a distance of up to a roll turning center shaft at time of being ground, at each of minute sections. CONSTITUTION:At each minute section, inclination of a moving locus in a grindstone is found out, and when the inclination is positive, the grindstone is moved to the left in the roll barrel length direction as far as a distance of its width of 1/2, and when it is negative, to the right in the roll barrel length direction as far as the distance of 1/2 of the width, respectively. Moreover, at each of these minute sections, the grindstone is moved in the roll turning center direction as far as a deviation portion between a roll diameter measured value and a desired moving curve of the grindstone at time being ground and a distance of up to a roll turning center shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a roll grinding method that can accurately obtain a target roll profile in grinding a roll.

(Prior Art) Work rolls for rolling wear out due to friction generated between the material to be rolled and the backup roll.

In hot rolling of thin plates, the range of rolling width is wide, and the center of the roll is constantly in contact with the material, and both ends are in contact with the material when the rolling width is wide. The amount of wear is greater at the end than at both ends.

This wear of the work rolls has a direct negative effect on the quality of the finished product, such as dimensional accuracy.
0 to 5000), the roll wear amount was 0. l0
When the thickness of the rolls reached approximately 0.30 mm, the rolls were replaced. This worn roll was then ground by a roll grinder installed in the roll shop.

However, with such means, it is not easy to grind a worn roll into a desired shape (a shape in which the roll diameter is constant at any location in the lengthwise direction of the roll body), and an improvement has been desired.

Therefore, in order to eliminate the uneven wear that occurs on the surface of the work roll, a grinding wheel is provided that is movable in the roll length direction, and the grinding wheel is pressed against the roll surface and rotated to grind the roll surface. A method is proposed.

In this conventional roll grinding method, the position of the grindstone is controlled using the center position of the grindstone in the width direction as a reference point.

FIG. 7 is a schematic explanatory diagram showing the locus of movement of the reference point in the roll body length direction of the grindstone in such a conventional roll grinding method. At the same time, grinding is performed using the center position of the bottom of the grindstone in the width direction as a reference for control. The solid line in the figure shows the target locus of movement, while the broken line represents the grinding result obtained when actually grinding is performed using this locus of movement.

(Problems to be Solved by the Invention) In other words, as is clear from the results shown in FIG. An error of half the width of the grinding wheel t occurs between the target movement trajectory and the actual grinding result, making it impossible to obtain the target roll profile.

To prevent such errors, simply reduce the amount by half the width of the grinding wheel (
When grinding is performed by moving the grindstone by t/2) in the direction of the roll axis (section D in Figure 7 moves as if tracing the solid line), the corner of the grindstone that is in constant direct contact with the roll Part (D part in FIG. 7) is unevenly worn, and the target roll profile cannot be stably obtained.

Here, an object of the present invention is to grind a rolling roll,
An object of the present invention is to provide a roll grinding method that can accurately obtain a target roll profile.

(Means for Solving the Problems) As mentioned above, the present inventor corrected the grinding wheel position by half the width of the grinding wheel in the length direction of the roll body, and prevented uneven wear occurring at the corners of the grinding wheel. Recognizing that it is necessary to make corrections in order to achieve this, we have conducted various studies to solve the above problems.

As a result, the inventor conducted grinding of the roll surface using a rotary grindstone and measurement of the diameter of the ground roll in parallel, and added this measured value to the width of the grindstone (t in FIG. 1(b)). We discovered that by correcting the travel trajectory of the grindstone that was set in advance and grinding the roll surface, it was possible to accurately obtain the target roll profile.
The invention has been completed.

Here, the gist of the present invention is to provide a roll grinding method for grinding the roll surface by pressing and rotating a grindstone that can reciprocate in the roll body length direction, in which (i) (ii) dividing the target movement curve into minute sections in the roll body length direction; (mountain) moving the grindstone along the target movement curve; (1v) In each of the minute sections, determine the inclination of the movement locus of the grindstone, and if the inclination is positive, apply a force in the roll body length direction to the grindstone by a distance of 172 times the width of the grindstone. ,
If the inclination is negative, the grindstone is moved to the right in the roll body length direction by a distance of 1/2 of the width of the grindstone, This roll grinding method is characterized in that the grindstone is moved in the direction of the roll rotation center by the deviation between the value of the grindstone and the distance between the target movement curve of the grindstone and the roll rotation center axis.

In the present invention, the "roll body length direction" refers to the longitudinal direction of the rolling roll, and means the X direction in FIG. 1(b).

In addition, in the present invention, "roll rotation center direction" means
In the cross section perpendicular to the roll body length direction, the direction is perpendicular to the X direction, that is, the roll radius +
When the direction that intersects with the χ direction and where the grindstone exists with respect to the central axis of rotation of the roll is +yX direction, "left in the roll body length direction" means to the X direction, and "right in the roll body length direction" means in the +X direction. Furthermore, the roll rotation center direction means the −X direction.

(effect) Hereinafter, the present invention will be explained in detail together with its effects.

In the present invention, since the error corresponding to the width of the grindstone is taken into account when the movement locus of the grindstone is finally determined, the error can be reduced as much as possible.

Furthermore, during grinding, the grinding wheel is moved in the direction of the roll rotation center (in other words, in the roll radial direction) by the deviation between the "measured roll diameter value" and the "distance between the grindstone target movement curve and the roll rotation center axis." By moving the grinding wheel, it is possible to prevent grinding errors caused by uneven wear of the corners of the grinding wheel.

Therefore, the target roll profile can be accurately obtained when grinding the mill roll.

Further, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1(a) and FIG. 1(b) are a schematic cross-sectional view and a schematic side view, respectively, of an apparatus used to carry out the roll grinding method according to the present invention.

This device is configured to be able to measure the roll diameter even during roll grinding. That is, in both figures, a roll diameter measurement sensor 1 that can measure the roll diameter by contacting the roll surface is fixed by a measurement arm 3 on the top of the roll that is the object to be ground and rotates in the direction of the arrow. - A drainage plate 2 is provided on the side of the roll diameter measurement sensor 1 to prevent the grinding fluid from entering between the tip of the roll diameter measurement sensor 1 and the roll. There is.

Note that the tip of the roll diameter measuring sensor 1 has a built-in pole so as to be able to withstand vibrations generated when it comes into contact with a roll, and is configured to be rotatable.

Furthermore, although the roll diameter measuring device is provided at the top of the roll in the embodiment shown in FIGS. 1(a) and 1 et al., it is not limited to this embodiment.

Furthermore, the grindstone is rotating in the direction of the arrow in both figures and is pressed against the surface of the roll.

Next, this device is used to grind the roll surface and measure the roll diameter, and the preset movement trajectory of the grindstone is corrected by taking into account the measured value of the roll diameter and the grindstone width. The specific content will be explained.

FIG. 2(a) is a process explanatory diagram schematically showing the determination of the grinding wheel correction amount and the outline of the grinding process of the roll grinding method according to the present invention, and FIG. a) No. 8
FIG. 4 is a process explanatory diagram schematically showing the contents of four steps.

First, each process from S to S4 in FIG. 2(a) will be explained in detail.

In this step, the desired shape of the roll, that is, the desired movement trajectory (y-f(x)) in FIG. 7 is input.

In addition, a CNC device (Computer Numeric
al Control), it is also possible to directly input fish school data, which will be described later.

In this process, the amount of correction for errors caused by the width of the grinding wheel is determined and input. As this correction amount, the grindstone width t may be used.

In this step, a new target movement trajectory is created in consideration of the fish school data, that is, the correction amount determined in step 32, regarding the center point in the width direction of the grindstone in the roll body length direction.

First, use the grindstone width t input in step 82 to calculate the step value in the roll body length direction! is obtained from the following formula % (where n is any integer).

Then, the total number of point groups N is expressed by the following 0 formula: %formula% (However, INT is converted into an integer) Seek more.

Then, the grindstone coordinates in each minute zone in the X-axis direction, that is, temporary fish school data are determined.

Here, the temporary fish school data is (X・・・)−01 Then, at this time, the slope of the curve expressed by the 0 formula is judged by the following 0 formula, 1, and the grinding wheel width (t/2) is Perform a correction by shifting the widthwise center point of the bottom.

In other words, as a differential function of the target movement trajectory y-f(x), y, = y,,.

y.

seek, Create fish school data from

The fish school data obtained in this way is shown graphically in FIG.

For example, at point A in Figure 3, that is, when the slope of the curve is positive, shift the center of the grinding wheel to the left by t/2, and
When the point, that is, the slope of the curve is negative, correction is performed without shifting the center of the grinding wheel to the right by t/2. Note that point B in Figure 3, that is, the point where the slope of the curve moves from positive to negative (
Yi'-0), no correction is performed.

The gong engineer starts grinding based on the grinding data obtained in this way8
Step 5) In step S, the roll diameter during grinding is measured using the roll diameter measuring sensor 1.

The measurement value is taken in as determined by the above formula 0.

Perform at the coordinate position.

Then, from the measurement curve shown in Fig. 4, that is, the captured values (X,, y,''), the ``measured roll diameter value at the time of grinding'' and the ``target movement curve of the grindstone and the center axis of roll rotation'' are determined. The deviation from the distance "is determined as y, -y, "-ΔY, and the grindstone is moved toward the center of roll rotation, (×0,
y+) → (x+, y, +ΔYi) to create a new target movement axis trajectory, and perform the next grinding traverse.

By repeating such steps, a roll grinding method is provided in which a target roll profile can be accurately obtained with respect to grinding of a rolling roll.

Furthermore, the effects of the present invention will be quantitatively explained with reference to Examples.

EXAMPLE By using the roll grinding method according to the present invention and the conventional roll grinding method that does not make corrections in the
m, roll width 2080 mm) was ground to 0.5 mm.

The results are shown in graphs in FIG. 5 (inventive example) and FIG. 6 (comparative example), respectively.

In the comparative example, the maximum error is 0.066 mm, whereas
According to the example of the present invention, this error could be reduced to 0.016 mm, and it can be seen that the method of the present invention was able to obtain a more accurate roll profile than the conventional method.

(Effects of the Invention) As detailed above, the present invention makes it possible to accurately obtain a target roll profile in grinding a rolling roll.

The significance of the present invention having such effects is extremely significant.

[Brief explanation of drawings]

1(a) and 1(b) are a schematic cross-sectional view and a schematic side view, respectively, showing the configuration of an apparatus used in the roll grinding method according to the present invention. A process explanatory diagram schematically showing the determination of the grinding wheel correction amount and the grinding process of the roll grinding method: FIG. 2(b) is a process explanatory diagram showing an overview of the 34 steps in FIG. 2(a). ; FIGS. 3 and 4 are schematic cross-sectional views showing the method for determining the grinding wheel correction amount and grinding in the roll grinding method according to the present invention; FIG. 5 is a graph showing the grinding results of the example of the present invention in the example FIG. 6 is a graph showing the grinding results of a comparative example in the example; and FIG. 7 is a schematic explanatory diagram showing the problems of the conventional roll grinding method. : Roll diameter measurement sensor: Drain plate 3: Measurement a

Claims (1)

[Scope of Claims] In a roll grinding method for grinding a roll surface by pressing and rotating a grindstone that can freely reciprocate in the roll body length direction, with respect to a cross section in the roll body length direction, (i) a widthwise direction of the grindstone; setting a target movement curve regarding the center point; (ii) dividing the target movement curve into minute sections in the roll body length direction; (iii) moving the grindstone along the target movement curve; and (iv) ) In each of the minute divisions, determine the inclination of the movement locus of the grindstone, and if the inclination is positive, move the grindstone to the left in the roll body length direction by a distance of 1/2 of the width of the grindstone;
If the inclination is negative, the grindstone is moved to the right in the roll body length direction by a distance of 1/2 of the width of the grindstone, A roll grinding method characterized in that the grindstone is moved in the direction of the center of rotation of the roll by the deviation between the "distance between the target movement curve of the grindstone and the center axis of rotation of the roll."