Metal deforming – By use of roller or roller-like tool-element – With carrier for roller-couple or tool-couple
Reexamination Certificate
2000-02-04
2001-04-17
Butler, Rodney A. (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
With carrier for roller-couple or tool-couple
Reexamination Certificate
active
06216518
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to roll position alignment that is carried out after rolls are assembled in a bar steel rolling mill. In particular, the present invention relates to a method of adjusting a roll position using a roll caliber and a guidance apparatus for adjusting the roll position.
2. Description of Related Art
In general, the position of a roll assembled in the housing of a bar steel rolling mill is directly visually adjusted by a worker using a gauge or the like.
There is also a method of using an optical gauge. According to this method, the overall image of a roll caliber is enlarged to several tens of times of its actual size and projected onto a screen. Then, a worker visually adjusts a roll position so that the reference profile of the roll caliber displayed on a projecting surface corresponds with the projected image. The roll caliber is a curved position for connecting the points at which a roll is in contact with a material to be rolled and determined by the roll position, the roll surface shape, and the like, in a rolling mill.
In the visual roll position adjusting method, however, the amount of adjustment cannot be quantitatively obtained even if an optical gauge is used. Accordingly, the roll adjustment does not have good accuracy and greatly depends on a worker's skill. The roll position adjusting job is also called a centering job. Moreover, because the adjusting job alone may require a long amount of time depending upon the degree of skill of the worker, there is also a problem that working efficiency is poor.
To address the above problems, Japanese Unexamined Patent Publication Nos. 6-167313 and 8-5343 propose a method of measuring the caliber profile of a roll caliber using image processing and determining the center and the radius of an affine circle corresponding to the thus obtained caliber profile. With this method, it is possible to automatically measure a roll position and to adjust the roll position based on a determined affine circle.
In the method disclosed in Japanese Unexamined Patent Publication No. 6-167313, however, sufficient accuracy cannot be obtained because the roll position is adjusted only by the profile of an actual caliber.
Further, in the methods disclosed in both of the above-mentioned publications, an overall caliber profile must be expressed with an affine circle. For this purpose, measurement must be carried out at many points, whereby control is made complicated.
Moreover, the methods disclosed in both of the above-mentioned publications mainly make use of the profile of the arc portion of a roll caliber in the vicinity of the center of the role caliber in an axial direction. The roll caliber is more worn at its center in the axial direction in rolling. Consequently, there is a possibility that an error is included in an amount corresponding to the amount of wear with respect to the coordinates of the determined affine circle. Thus, there is a possibility that positional accuracy is deteriorated by the amount of error due to the wear.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above problems. An object of the present invention is to provide a roll position adjusting method of a bar steel rolling mill and a roll position adjusting guidance apparatus that can accurately adjust a roll position by a simple system.
The present invention relates to a method of adjusting a roll position in a bar steel rolling mill by using two portions of a roll caliber, which are located at approximately symmetrical positions with respect to a rolling reduction direction, as sensing positions and determining the sum of, and that difference between, the areas located between the reference profile and the actually measured profile at the two sensing positions. The present invention is applicable, for example, to any one of a two-roll rolling mill, a three-roll rolling mill, and a four-roll rolling mill, as the bar steel rolling mill.
In some embodiments, it is preferable that the sensing positions are located at material escape portions at both of the ends of a roll in a roll axial direction, and that the actually measured profile of the sensing positions is extracted by subjecting video signals of the sensing positions of the rolls to image processing.
Exemplary embodiments of the roll position adjusting guidance apparatus of the present invention can comprise a roll caliber illuminating device, a video signal input device that inputs the video signals of the sensing positions of a roll caliber at the two portions of the roll caliber located approximately symmetrically with respect to a rolling reduction direction, an image processing apparatus that determines the actually measured profile of the sensing positions based on the video signals, and a determining device that determines a guidance in the rolling reduction direction from the sum of the areas located between the actually measured profile and the reference profile at the sensing positions, and a guidance in the roll axial direction from the difference between these areas.
According to the present invention, an error due to wear of the roll caliber can be reduced to a low level because the roll position is adjusted making use of both of the ends of the roll caliber in the roll axial direction, which are less worn by rolling as compared with the central portion of the roll caliber in the axial direction of the roll caliber.
Further, because the sensing positions are located at only a portion of the roll caliber, the roll position can be adjusted without being affected by the complex shape of the roll at the central portion of the roll in the roll axial direction. Therefore, the calculations and the like in the image processing can be simplified. Further, the amounts of location discrepancy of the roll in the rolling reduction direction and the roll axial direction and the dislocating directions of the roll can be simply determined from the sum of, and the difference between, the areas located between the reference profile and the actually measured profile of the roll caliber at the sensing positions. That is, the guidances for the adjustment of the roll position can be simply provided quantitatively. In particular, the employment of the material escaping portions located at both of the ends of the roll caliber as the sensing positions is advantageous in the simplification and the accuracy of the calculation of the areas and the like, because the material escaping portions are less worn by rolling in the roll caliber and further have a linear or a smooth curved profile.
REFERENCES:
patent: 3574280 (1971-04-01), Smith, Jr.
patent: 5467625 (1995-11-01), Holthoff
patent: 6-167313 (1994-06-01), None
patent: 8-5343 (1996-01-01), None
Ogawa Takao
Sakurai Tomoyasu
Butler Rodney A.
Kawasaki Steel Corporation
Oliff & Berridg,e PLC
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