JP2826792B2 - Rolling method for steel plate with protrusions with excellent protrusion height accuracy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling method for producing a steel sheet with projections having excellent projection height accuracy.

[0002]

2. Description of the Related Art Conventionally, as a rolling technique for a steel sheet with projections formed for the purpose of improving the bonding property of concrete or the like and reinforcing or preventing slippage, a caliber is filled with a rolling material to achieve the desired purpose. Some attempt to form protrusions with a height. For example, JP 62
In the case of manufacturing by rolling a steel sheet with projections using caliber rolls as in JP-A-54502, rolling is performed using a caliber roll in which the caliber depth in the rolls is larger than the maximum value of the projection height obtained by rolling. Methods are known.

[0003]

In these disclosed methods, means for surely obtaining an arbitrary projection height are described, and the projection height is changed by this means. Whether it is optimal or not is only expected, and even if it is actually measured, there is only a method of manually measuring or visually confirming offline after the end of rolling, and until obtaining the information of projection height, Further, there is a long time loss until the height of the protrusion is corrected as intended, and the accuracy is not sufficient in reality.

On the other hand, the height of the projections needs to be accurately managed and controlled in order to control the lowest part depending on the use of the steel sheet or the highest part by improving the yield.
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to quickly and optimally manage and control the protrusion by accurately measuring the height of the protrusion.

[0005]

SUMMARY OF THE INVENTION The present invention attains the above-mentioned object, and the gist of the invention is as follows: (1) When rolling a steel sheet with projections parallel to the rolling direction, The thickness gauge located on the machine exit side or in the middle is moved in the width direction, and the height of the protrusion is accurately recognized from the thickness of each of the protrusion and the base of the obtained steel plate. A method for rolling steel plates with projections with excellent projection height accuracy.

(2) When rolling a steel plate with projections parallel to the rolling direction, the amount of walk of the moving plate of the thickness gauge is determined by a horizontal run-out signal of a width gauge located on the exit side or in the middle of the rolling mill. (1) the projection height is accurately recognized by accurately detecting the thickness of each of the projection and the base of the steel sheet by correcting the thickness of the projection. A method of rolling a steel plate with protrusions.

(3) When rolling a steel plate having projections parallel to the rolling direction, the rolling reduction of a rolling mill in which grooved rolls are set is changed according to the projection height accurately recognized. A method for rolling a steel sheet with projections having excellent projection height accuracy.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a conceptual diagram showing an implementation facility according to the present invention. As shown in FIG. 1, a steel sheet 1 is provided with grooved rolls 4 with respect to normal flat rolls 2 and 3, and a steel sheet having projections on one side of the steel sheet is continuously rolled in the rolling direction. FIG. 1 shows an example in which the grooved roll 4 is incorporated in a final stand. This final stand is a grooved roll 4
On the downstream side, a thickness gauge 5 movable in the width direction is provided, and on the downstream side, a thickness gauge 6 is provided, and its signal is sent to an arithmetic and control unit 7 which is a data processing device. It has a configuration to connect.

FIG. 2 is a perspective view showing a steel sheet with projections according to the present invention. As shown in FIG. 2, as is apparent from the cross-sectional shape in the width direction of the steel sheet with projections, the projection 8 and the base 9
Are alternately configured. In this case, even if an attempt is made to measure the center plate thickness, the measurement field of view of the thickness gauge usually measures only the projection 8 of the steel plate and the base 9 which is the projection-free portion. There is a case where only the measurement is performed or a case where both are measured in the field of view. This phenomenon occurs when the rolling material is relatively displaced from the center of the rolling material due to the meandering of the rolling. Therefore, a normal AGC (Automa) is performed using the thickness signal measured by the conventional method.
When tic gage control is attempted, a hunting phenomenon occurs, and it is not possible to control the thickness.

For this purpose, after the steel sheet reaches the thickness gauge 5, the thickness gauge 5 is traversed in the width direction from one edge to the other edge. At this time, for example, assuming that the measurement reference value of the thickness gauge matches the base portion 9, a thickness deviation signal is output at an arbitrary width direction position as shown in FIG. At this time, for example, if the arithmetic and control unit 7 performs appropriate numerical processing using this signal, a continuous projection plate thickness 8 and a base plate thickness 9 can be obtained. Further, by calculating the projection height 10, which is the difference, it is possible to recognize the accurate projection height separated from the thickness variation of the base portion.

Further, even if the steel sheet moves in the width direction while the thickness gauge is moving from one edge to the other edge, the arithmetic and control unit uses the lateral runout signal of the thickness gauge to adjust the thickness gauge as needed. By correcting the position being measured, the thickness deviation signal at the arbitrary position in the width direction can be obtained with higher accuracy, and the projection height 10 can be recognized with higher accuracy. In addition, the arithmetic and control unit recognizes the accurate projection height 10 by using the recognition.
Calculate the deviation from the target projection height and the amount of change in the reduction required to correct it, and change the reduction of the rolling mill on which the grooved rolls are set between at least one of the bars or within the bars. Thereby, the projection height 10 can be optimized.

More specifically, when the base plate thickness 9 is as intended and the projection height 10 is low, the rolling reduction of the upstream flat rolls 2 and 3 is reduced, and the rolling reduction of the grooved roll 4 is reduced. By increasing the thickness, it is possible to increase the reduction rate of the upstream flat rolls 2 and 3 and to reduce the reduction rate of the grooved roll 4 when the protrusion height 10 is high without disturbing the base plate thickness. Thereby, the projection height 10 can be aimed at without giving any disturbance to the base plate thickness.

Further, when the base plate thickness 9 is not as intended but the projection height 10 is as intended, the reduction of the grooved roll 4 is maintained and the reduction of the flat rolls 2 and 3 is changed. , Without disturbing the projection height 10
Insufficient accuracy, such as management based on the assumption that the projection height 10 can be achieved as planned, or management in online hand measurement, by taking measures as if the base plate thickness 9 can be achieved as intended. In addition, the management and control of the height of the protrusion, which has caused a large time loss, can be quickly and accurately performed.

[0014]

Embodiments of the present invention will be described below in detail. The test was carried out by flat rolls Nos. 2 and 3 as the practical equipment as shown in FIG. 1 and a fourth finish rolling mill which is a grooved roll as a final rolling stand. FIG. 4 shows the thickness deviation state of the steel sheet with projections according to the conventional method and the present invention. That is, FIG. 4A shows a state in which the height of the protrusion greatly varies. On the other hand, FIG. 4B shows a result in which both the base portion, the plate thickness, and the projection height can be precisely controlled as intended by implementing the present invention.

[0015]

As described above, according to the present invention, it is possible to quickly and optimally manage and control the height by accurately measuring the height of the protrusion of the steel plate with protrusions. Thus, it is possible to obtain an excellent effect that it is possible to obtain a high plate thickness accuracy and to improve the yield.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an implementation facility according to the present invention,

FIG. 2 is a perspective view showing a steel sheet with projections according to the present invention;

FIG. 3 is a diagram showing a relationship between a position in a sheet width direction and a sheet thickness deviation;

FIG. 4 is a view showing a thickness deviation state of a steel sheet with projections according to a conventional method and the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate 2, 3 Flat roll 4 Slotted roll 5 Thickness gauge 6 Width gauge 7 Arithmetic control unit 8 Projection part 9 Base part 10 Projection height

Claims (3)

(57) [Claims] When rolling a steel sheet having projections parallel to the rolling direction, a thickness gauge located at the side of a rolling mill or at an intermediate position is moved in the sheet width direction, and a projection and a base of the obtained steel sheet are moved. A method of rolling a steel sheet with projections having excellent projection height accuracy, wherein the projection height is accurately recognized from each sheet thickness. 2. When rolling a steel plate having projections parallel to the rolling direction, the walk amount of the moving thickness gauge is used to determine the walk amount of the moving thickness gauge according to a horizontal runout signal of a width gauge located on the exit side or in the middle of the rolling mill. 2. The projection having excellent projection height accuracy according to claim 1, wherein the projection height is accurately recognized by correcting the thickness of each of the projection portion and the base portion of the steel plate more accurately. Method of rolling steel plate with 3. The rolling reduction of a rolling mill in which a grooved roll is set is changed according to a projection height that is accurately recognized when rolling a steel plate with projections parallel to the rolling direction. A method for rolling a steel sheet with projections having excellent projection height accuracy as described.