JPH11285713A - Method for setting amount of on-line roll grinding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the preset amount of an on-line roll grinding device easily and accurately. SOLUTION: The ratio of corrected wear amount to calculated wear amount in the prescribed position in the axial direction of a roll is determined as a correction factor and the distribution of the whole wear amount in the axial direction of the roll is corrected by the correction factor. A stepped shape is generated from the corrected distribution of the wear amount and the amount of grinding with the on-line roll grinding device 20 is decided so as to remove the stepped shape generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-line roll grinding amount setting method and apparatus, and more particularly to a method for grinding a roll step by pressing a rotating grindstone against a peripheral surface of a roll while the roll is incorporated in a rolling mill. Due to the calculation error of the roll axial wear distribution managed by the host computer, suitable for use in online roll grinding to be performed, the rolls for grinding the stepped shape remaining on the actual roll surface with the online roll grinding device The present invention relates to an on-line roll grinding amount setting method and apparatus capable of easily and accurately setting a grinding amount.

[0002]

2. Description of the Related Art When a rolled material, for example, a steel plate, is rolled by a rolling mill, the contact portion of the roll with the rolled material is locally worn, so that the roll profile changes each time rolling is repeated. In particular, when rolling a wide rolled material after rolling a narrow rolled material, when a wide rolled material is rolled, step wear occurs at a portion in contact with the narrow rolled material width end of the roll. This makes it difficult to control the plate profile. Therefore, the operation is usually performed by regulating the rolling order so as to change from a wide material to a narrow material. However, such regulation of the rolling order based on the sheet width causes a decrease in productivity.

Therefore, in order to eliminate such inconveniences, as shown in FIG. 1, an on-line roll grinding (grinder) device (hereinafter abbreviated as ORG device) 20 is provided in a rolling mill.
The so-called online roll grinding in which the roll 10 is maintained in a predetermined profile by grinding the non-contact portion 10A with the rolled material of the roll 10 during rolling or rolling idling is proposed. .

[0004] The ORG device 20 includes a rotary grindstone 22 provided to be able to advance and retreat with respect to the peripheral surface 10B of the roll 10;
It is provided with a drive motor 24 composed of, for example, a hydraulic motor for driving the rotary grindstone 22 to rotate, and an advance / retreat driving device (not shown) for driving the rotary grindstone 22 to advance / retreat as shown by an arrow A. The rotating grindstone 22 is pressed against the non-contact portion 10A of the rotating roll peripheral surface 10B according to the position of the step wear 10C and the amount of wear ΔD grasped based on the calculation result and the measurement result of the roll profile while grinding. By moving in the roll axis moving direction as shown by arrow B, the entire roll peripheral surface 10B is smoothed.

[0005] The grinding amount of the ORG apparatus 20 has been conventionally determined as follows. That is, as shown in FIG. 2, the host computer 3 for managing the information of the steel sheet on the rolling line.
0, the roll surface wear distribution We in the roll axis direction (wear distribution), for example, using the following equation, based on the width W of the rolled steel sheet, the roll extension L, the rolling load P, the work roll diameter D, and the like. Is also calculated for each rolled steel sheet.

We = K × f (W, L, P, D) (1)

Here, K is a wear correction coefficient.

Then, the wear amount We of the rolled steel sheet obtained by the calculation and the accumulated wear amount ΣWe by the rolling up to that time are managed. The wear amount We of each rolled steel sheet is transmitted to an online roll grinding machine control computer (hereinafter referred to as an ORG control computer) 40 for each steel sheet roll.

The ORG control computer 40 is a host computer 30
Based on the information sent from the computer, the accumulated shape of the accumulated wear amount (referred to as the calculated amount of wear distribution) as shown by the dashed line A in FIG. The ORG grinding portion B is determined in consideration of the distribution of the grinding amount, the grinding amount is calculated, and the ORG device 20 is ground.

The ORG control computer 40 accumulates and manages the wear amount transmitted from the host computer 30, and also accumulates and manages the actual grinding amount distribution in the roll axis direction.

[0011]

However, the calculated wear distribution A in the roll axis direction calculated by the host computer 30 and the distribution of the actual wear amount as shown by a broken line C in FIG. Even if the ORG device 20 grinds according to the information from the host computer 30 due to an error from the upper-level computer 30, the actual work roll has a stepped shape D due to a wear calculation error, as shown by hatching in FIG. Will remain.

Due to the calculation error, FIG.
That a stepped shape like the hatched portion D shown in FIG.
For example, even if it can be recognized from a large disturbance in the cross-sectional shape of the steel sheet after finish rolling, in order to remove the step shape on the roll surface by the ORG device 20, as shown in FIG. ) Position F1,
.. And the grinding amounts G1, G2,... Have to be directly set on the ORG device 20 on the CRT by the operator. Further, based on the display on the CRT and the actual difference, etc., the operator can determine the step positions F1, F2,.
If an inappropriate value is set for 2,..., An inconsistency occurs between the cumulative wear amount distribution and the cumulative grinding amount distribution managed in the ORG control computer 40, and as shown in FIG. As described above, there is a problem that local over-grinding H is performed or a local step I remains on the roll surface.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to make it possible to easily and accurately set the amount of online roll grinding.

[0014]

According to the present invention, there is provided an online roll grinding apparatus for grinding a stepped shape remaining on the actual roll surface by an online roll grinding device according to a distribution of a wear amount in a roll axial direction managed by a host computer. In the grinding amount setting method, when a corrected wear amount at a predetermined position in the roll axis direction is input, a ratio of the corrected wear amount to the calculated wear amount at the same position is obtained as a correction rate, and the wear rate in the entire roll axis direction is determined by the correction rate. The amount distribution is corrected, a step shape is generated based on the corrected wear amount distribution, and the amount of grinding by the online roll grinding device is determined so as to remove the generated step shape. It is a solution.

According to the present invention, in a similar online roll grinding amount setting device, a means for inputting a corrected wear amount at a predetermined position in the roll axis direction and a means for obtaining a ratio of the corrected wear amount to the calculated wear amount at the same position as a correction rate. Means for correcting the wear amount distribution in the entire roll axis direction by the correction rate,
Means for generating a step shape based on the corrected wear amount distribution, and means for determining the amount of grinding by an online roll grinding device so as to remove the generated step shape, solve the same problem. It is a solution.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The present invention is similar to the prior art shown in FIG. 1 and FIG.
In the system including the control computer 40, as shown in FIG. 7, a predetermined position in the roll axis direction (the center position in the embodiment).
Input screen device 50 for inputting the actual wear amount of the
When the corrected wear amount at the center position in the roll axis direction is input by the manual input screen device 50, the host computer 30
Then, the ratio of the corrected wear amount to the calculated wear amount at the same position is determined as a correction rate, and the ORG control computer 40 corrects the wear amount distribution in the entire roll axis direction by multiplying the correction rate by the correction rate. A step shape is generated based on the quantity distribution, and the O step is performed so as to remove the generated step shape.
The amount of grinding by the RG device 20 is determined.

The operation of the embodiment will be described below.

First, the wear distribution in the roll axis direction managed by the host computer 30 is displayed on the screen of the manual input screen device 50 so that a (wear) correction amount can be input. The host computer 30 calculates, for example, the ratio of the amount of correction to the amount of wear at the center in the roll axis direction as a percentage, and transfers it to the ORG control computer 40 as a (wear) correction ratio. For example, if the calculated amount of wear at the center in the roll axis direction is 12 μm, but the actual amount of wear is found to be larger than the calculated amount of wear as shown in FIG. When 6 μm is added to the amount and estimated to be 18 μm, the correction rate of the corrected wear amount to the calculated wear amount is 18/12 × 10
0 = 150%. However, it is assumed that the actual wear amount is 20 μm, which is larger than the corrected wear amount.

The ORG control computer 40 obtains a corrected calculated wear amount distribution as shown by a solid line J in FIG. Then, a stepped shape B as shown in FIG. 9 is generated, and the amount of grinding required to remove the stepped shape B is set in the ORG device 20.

In this way, the step shape due to the calculation error can be minimized without changing the recognition of the step position. FIG. 10 shows an example of the minimized step shape K (in this example, the step is 2 μm).

In this way, it is possible to easily set the ORG device 20 for minimizing the step formed on the actual roll by calculating the wear amount without accurately grasping the step position of the actual roll. In addition, since the distribution of the wear amount in the roll axis direction managed in the ORG control computer 40 is corrected by the correction rate, the recognition of the step position does not deviate from the distribution of the grinding amount, and the local excessive amount is not changed. There is no grinding or ungrinding. Further, after the correction amount is input and the roll step shape due to the grinding error is removed by the ORG device 20, zero is input again to the correction amount, so that the wear amount distribution managed in the ORG control computer 40 is not corrected. It returns to the distribution and can easily return to the state before correction.

In the above embodiment, the wear amount at the center in the roll axis direction is input through the input screen device 50. However, the position at which the wear amount is input is not limited to this. Further, the rolling target is not limited to the steel plate.

Although the corrected amount of wear is visually checked by an operator, the amount of wear may be measured and the measured value may be used. In this case, grinding can be performed with higher accuracy.

[0025]

According to the present invention, the entire calculated wear amount distribution can be corrected only by inputting the actual wear amount at a predetermined position in the roll axis direction without inputting the step position.
The amount of grinding by the online roll grinding device can be easily and accurately set.

[Brief description of the drawings]

FIG. 1 is a sectional view for explaining an online roll grinding apparatus to which the present invention is applied;

FIG. 2 is a system configuration diagram for explaining a conventional online roll grinding amount setting method.

FIG. 3 is a diagram showing a comparison between a calculated wear amount distribution and an actual wear amount distribution.

FIG. 4 is a diagram showing a step shape remaining due to a wear calculation error.

FIG. 5 is a diagram for explaining a conventional problem, showing a state in which a step position and a grinding amount are inconsistent.

FIG. 6 is also a diagram showing local residual steps and local over-grinding caused by the mismatch.

FIG. 7 is a system configuration diagram showing an overall configuration of an embodiment of an online roll grinding amount setting device for carrying out the present invention.

FIG. 8 is a diagram showing a comparison between a calculated wear amount distribution before correction and an actual wear amount distribution in the embodiment.

FIG. 9 is a diagram showing a comparison between the calculated wear amount distribution and the actual wear amount distribution after the correction.

FIG. 10 is a diagram showing an example of a step shape minimized by the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Work roll 20 ... Online roll grinding (ORG) apparatus 30 ... Host computer 40 ... ORG control computer 50 ... Manual input screen apparatus

(72) Inventor Katsuhiro Takebayashi 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Inside Kawasaki Steel Works Chiba Works (72) Inventor Norio Takashima 1 Kawasaki-cho, Chuo-ku Chiba City, Chiba Prefecture Kawasaki Steel Corporation (72) Inventor Sadayuki Miyoshi 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Prefecture Kawasaki Steel Corporation Chiba Works

Claims (2)

[Claims] A step shape remaining on the actual roll surface is determined by a roll axial wear amount distribution managed by a host computer.
In the online roll grinding amount setting method for grinding with an online roll grinding device, when a corrected wear amount at a predetermined position in the roll axis direction is input, a ratio of the corrected wear amount to the calculated wear amount at the same position is obtained as a correction rate, The wear rate distribution in the entire roll axis direction is corrected by the correction rate, a step shape is generated based on the corrected wear amount distribution, and grinding is performed by an online roll grinding device so as to remove the generated step shape. An online roll grinding amount setting method characterized by determining the amount. 2. The step shape remaining on the actual roll surface is determined by the roll axial wear amount distribution managed by the host computer.
A means for inputting a corrected wear amount at a predetermined position in the roll axis direction in an online roll grinding amount setting device for grinding with an online roll grinding device, and a means for obtaining a ratio of the corrected wear amount to the calculated wear amount at the same position as a correction rate. Means for correcting the wear amount distribution in the entire roll axis direction by the correction rate; means for generating a step shape based on the corrected wear amount distribution; and removing the generated step shape. An online roll grinding amount setting device, comprising: means for determining a grinding amount by an online roll grinding device.