KR20160114917A

KR20160114917A - Apparatus for grinding surface of work rolls and method thereof

Info

Publication number: KR20160114917A
Application number: KR1020150041403A
Authority: KR
Inventors: 조상구; 김형진; 송혁진; 임성혁; 임준석; 정도균
Original assignee: 현대제철 주식회사
Priority date: 2015-03-25
Filing date: 2015-03-25
Publication date: 2016-10-06

Abstract

The present invention relates to an apparatus and a method to grind a rolling roll. The apparatus comprises: a top roll diameter detecting unit to detect the top roll diameter of a rolling stand; a bottom roll diameter detecting unit to detect the bottom roll diameter of the rolling stand; a rolling information detecting unit to detect one or more pieces of rolling information from the rolling stand; a roll abrasion quantity calculating unit to calculate the roll abrasion quantity (W) of each of the top roll and the bottom roll based on one or more pieces of information detected by the top roll diameter detecting unit, the bottom roll diameter detecting unit, and the rolling information detecting unit; and a control unit to update the diameter of the top roll and the bottom roll by using the calculated roll abrasion quantity, to detect the rolling roll whose diameter is greater based on the updated diameter difference between the top roll and the bottom roll, and to grind the rolling roll by using a roll grinder. The present invention aims to provide an apparatus and a method to grind a rolling roll and reduce the diameter difference between the top roll and the bottom roll of a rolling stand.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a rolling roll grinding apparatus and method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling roll polishing apparatus and method, and more particularly, to a rolling roll polishing apparatus and method capable of reducing roll gap deviation between an upper roll and a lower roll of a rolling stand.

In general, an ORP (Online Roll Profiler) mounted on a rolling mill is installed in a stand for performing finish rolling during a rolling process, and is a facility for polishing the surface of a rolling roll during a rolling process.

The ORP rotates the grinding wheel together with the grinding start signal, performs the advancing operation with reciprocation, and can maintain the neutral state at the same time as stopping the rotation and reciprocation together with the grinding completion signal.

The ORP has a front grinding for grinding the entire surface of the rolling roll, and a step grinding for polishing only a portion where the surface of the rolling roll is protruded. For reference, the step of the surface of the rolling roll is such that roll wear occurs And non-soldered areas are caused by no roll wear.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open No. 10-2009-0131964 (published on December 30, 2009, on-line roll polishing apparatus and its grinding wheel stand position correcting method).

According to an aspect of the present invention, there is provided a rolling roll polishing apparatus and method which can reduce a roll gap deviation between an upper roll and a lower roll of a rolling stand.

A rolling roll polishing apparatus according to one aspect of the present invention includes: an upper roll diameter detecting section for detecting an upper roll diameter of a rolling stand; A lower roll diameter detector for detecting a lower roll diameter of the rolling stand; A rolling information detector for detecting at least one rolling information in the rolling stand; A wear amount calculating unit for calculating a roll wear amount (W) for upper and lower rolls based on at least one information detected through the upper roll diameter detecting unit, the lower roll diameter detecting unit, and the rolling information detecting unit; And a control unit for updating the diameter of the upper / lower roll by using the calculated roll wear amount information, detecting a roll having a larger diameter on the basis of the difference in diameter between the updated upper and lower rolls, And a control unit for polishing the substrate.

In the present invention, the rolling information may include at least one of a descending force, a strip width, a length, a hardness, a thickness, a roll diameter, and an advance ratio information.

In the present invention, the control unit calculates the roll wear amount using the following equation (1).

(1)

Where a and b are the adjustment coefficient (or the roll characteristic coefficient), the hardness is the characteristic coefficient of the roll itself,? Is the descending force correction coefficient,? Is the contact length correction coefficient (correction coefficient obtained by the experimental value) (Ie, the roll peripheral speed).

In the present invention, the roll polishing machine selectively polishes the upper roll or the lower roll of the rolling stand under the control of the controller.

In the present invention, the control unit compares diameters of the updated upper roll and lower roll, and when the diameter difference between the upper roll and the lower roll is larger than a preset reference value, And the rolling roll is detected.

In the present invention, when the result of subtracting the lower roll diameter from the upper roll diameter is less than 0, the controller determines that the diameter of the lower roll is larger than the diameter of the upper roll, And when the result is larger than 0, it is determined that the diameter of the upper roll is larger than the diameter of the lower roll.

According to another aspect of the present invention, there is provided a rolling roll polishing method including: a step of a control section collecting rolling information; Calculating a wear amount of the upper roll and the lower roll based on the collected rolling information; Updating the roll diameter information based on the wear amount of the upper roll and the lower roll; Wherein the controller compares diameters of the updated upper and lower rolls and if the diameter difference between the upper roll and the lower roll is greater than a preset reference value, ; And polishing the roll with a larger diameter using the roll polishing machine.

In the present invention, in the step of detecting a rolling roll having a larger diameter of the upper roll and the lower roll, the control unit controls the lower roll so that the diameter of the lower roll is smaller than the lower roll, The diameter of the upper roll is determined to be larger than the diameter of the lower roll, and when the result of subtracting the lower roll diameter from the upper roll diameter is greater than 0, the diameter of the upper roll is determined to be larger than the diameter of the lower roll.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to reduce the roll gap deviation between the upper roll and the lower roll of the rolling stand, thereby preventing quality defects due to upwards and downwards. Further, the present invention has the effect of improving the productivity by reducing the deviation of the roll diameter caused by the wear of the upper roll and the lower roll of the rolling stand.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exemplary view showing a schematic configuration of a rolling roll polishing apparatus according to an embodiment of the present invention; Fig.
2 is a flow chart for explaining a rolling roll polishing method according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of a rolling roll polishing apparatus and method according to the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exemplary diagram showing a schematic configuration of a rolling roll polishing apparatus according to an embodiment of the present invention; Fig.

1, the rolling roll polishing apparatus according to the present embodiment includes an upper roll diameter detecting unit 110, a lower roll diameter detecting unit 120, a rolling information detecting unit 130, a wear amount calculating unit 140, (150), and a roll grinder (160).

The upper roll diameter detecting unit 110 detects the diameter of the upper roll using a sensor (for example, a light receiving unit) (not shown) provided in advance.

The lower roll diameter detecting unit 120 detects the diameter of the lower roll by using a sensor (for example, a light receiving unit) (not shown) provided in advance.

The rolling information detecting unit 130 detects at least one of rolling information, a strip width, a length, a hardness, a thickness, a roll diameter, and advanced ratio information from a rolling stand (not shown).

1, a looper is provided for maintaining the tension between the rolling stands, and the contact length between the roll and the strip is inevitably different between the upper and lower portions by the looper, and the contact length The difference always causes the deviation of the roll wear, that is, the roll gap deviation.

The wear amount calculating unit 140 calculates the roll wear amount W based on the information detected through the upper roll diameter detecting unit 110, the lower roll diameter detecting unit 120, and the rolling information detecting unit 130 .

The roll wear amount W is calculated for the upper / lower rolls.

At this time, the roll wear amount W can be calculated using the following equation (1).

The control unit 150 updates the diameter of the upper / lower rolls using the calculated roll wear amount information, and when the diameter difference of the updated upper / lower rolls is larger than a preset reference value, And the rolled roll is polished.

The roll polishing machine 160 selectively polishes the upper roll or the lower roll under the control of the controller 150.

In the present embodiment, the functions performed by the upper roll diameter detecting unit 110, the lower roll diameter detecting unit 120, the rolling information detecting unit 130, the wear amount calculating unit 140, and the control unit 150 are classified However, the controller 150 may perform all the functions.

Hereinafter, a method of polishing the rolling roll by the controller 150 will be described in more detail with reference to FIG.

2 is a flow chart for explaining a rolling roll polishing method according to an embodiment of the present invention.

As shown in FIG. 2, the control unit 150 of the rolling roll polishing apparatus according to the present embodiment collects the rolling information (S101).

At this time, the rolling information includes at least one of the descending force, the strip width, the length, the hardness, the thickness, the roll diameter, and the advanced ratio information.

For reference, the down force can be detected using a load cell (i.e., a load meter, a load sensor, or a force sensor) (not shown), and the strip width can be detected using a width meter And the thickness of the strip can be detected using a thickness meter (not shown). Other information (eg, advanced rate, input / output thickness per stand) can be substituted for theoretical or approximate figures.

Then, the control unit 150 calculates the wear amount of the upper roll and the lower roll based on the collected rolling information (S102).

Next, the controller 150 updates the roll diameter information based on the calculated wear amount of the upper roll and the lower roll (S103).

That is, information on the wear amount calculated for each of the existing upper / lower roll diameters is added to update the diameter information of the upper roll and the lower roll.

If the difference between the diameters of the upper roll and the lower roll is larger than a predetermined reference value (NO in S104), the control unit 150 compares diameters of the upper roll and the lower roll, This larger rolling roll is detected (S105).

The controller 150 subtracts the lower roll diameter from the upper roll diameter, and if the subtracted result is smaller than 0 (YES in S105), it means that the diameter of the lower roll is larger than the diameter of the upper roll, The controller 160 controls the roll polishing machine 160 to polish the lower roll (S106).

The controller 150 subtracts the lower roll diameter from the upper roll diameter and if the result of the subtraction is larger than 0 (NO in S105), it means that the diameter of the upper roll is larger than the diameter of the lower roll, The controller 160 controls the roll polishing machine 160 to polish the upper roll (S107).

As described above, according to the embodiment of the present invention, it is possible to prevent quality defects due to the upward or downward movement of the strip and to improve the productivity by reducing the roll gap deviation between the upper roll and the lower roll of the rolling stand.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand the point. Accordingly, the technical scope of the present invention should be defined by the following claims.

110: upper roll diameter detector
120: lower roll diameter detector
130: Rolling information detecting section
140:
150:
160: Roll grinder

Claims

An upper roll diameter detector for detecting an upper roll diameter of the rolling stand;
A lower roll diameter detector for detecting a lower roll diameter of the rolling stand;
A rolling information detector for detecting at least one rolling information in the rolling stand;
A wear amount calculating unit for calculating a roll wear amount (W) for upper and lower rolls based on at least one information detected through the upper roll diameter detecting unit, the lower roll diameter detecting unit, and the rolling information detecting unit; And
The diameter of the upper / lower rolls is updated using the calculated roll wear amount information, and a rolling roll having a larger diameter is detected based on the difference in diameter of the updated upper / lower rolls, and the rolling roll is polished And a control unit for controlling the rolling rolls.

The method according to claim 1,
The thickness, the roll diameter, and the advance ratio information of the rolling rolls.

The apparatus of claim 1,
And the amount of roll wear is calculated using the following equation (1). &Lt; EMI ID = 1.0 >
(1)

The roll polishing machine according to claim 1,
And the upper roll or lower roll of the rolling stand is selectively polished under the control of the control unit.

The apparatus of claim 1,
And comparing the diameters of the updated upper roll and lower roll and detecting a rolling roll having a larger diameter among the upper roll and the lower roll when the diameter difference between the upper roll and the lower roll is larger than a preset reference value Rolling roll polishing apparatus.

6. The apparatus of claim 5,
If the result of subtracting the lower roll diameter from the upper roll diameter is less than 0, it is determined that the diameter of the lower roll is larger than the diameter of the upper roll. If the result of subtracting the lower roll diameter from the upper roll diameter is greater than 0, And judges that the diameter is larger than the diameter of the lower roll.

The control unit collecting the rolling information;
Calculating a wear amount of the upper roll and the lower roll based on the collected rolling information;
Updating the roll diameter information based on the wear amount of the upper roll and the lower roll;
Wherein the controller compares diameters of the updated upper and lower rolls and if the diameter difference between the upper roll and the lower roll is greater than a preset reference value, ; And
And a step of grinding the larger-diameter rolling roll using the roll polishing machine.

8. The method of claim 7,
In the step of detecting a larger roll of the upper roll and the lower roll,
Wherein,
If the result of subtracting the lower roll diameter from the upper roll diameter is less than 0, it is determined that the diameter of the lower roll is larger than the diameter of the upper roll. If the result of subtracting the lower roll diameter from the upper roll diameter is greater than 0, And judging that the diameter is larger than the diameter of the lower roll.