JPH06285504A - Method for rolling projecting steel sheet excellent in precision of projection height - Google Patents

Abstract

PURPOSE:To roll a projecting steel sheet excellent in precision of projection height by moving a plate thickness meter in the direction of the sheet width and confirming the projection height plessigly from the sheet thickness of each of the projecting part and the base part of the steel sheet obtained. CONSTITUTION:The steel sheet 1 is rolled by flat rolls 2, 3 and a grooveed roll 4 to manufacture a projecting steel sheet 1. As the plate thickness meter 5 mounted on the back side of the roll 4 is traversed in the direction of the sheet width, the thickness of the steel sheet 1 is measured. The measured values are inputted into an arithmetic and control unit 7 and processed numerically to obtain the sheet thicknesses of the projecting part and those of the base part. In the meantime, though the steel sheet 1 moves in the width direction, the measured positions of the plate thickness meter 5 are corrected by using cross deflection signals of the plate width meter 6 to improve the precision. Since the sheet thickness can be measured precesely, management, control are performed quickly and under optimum condition to obtain an excellent sheet thickness precision.

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 plate with protrusions having excellent protrusion height accuracy.

[0002]

2. Description of the Related Art Conventionally, as a rolling technique for a steel sheet with protrusions which is formed for the purpose of reinforcing concrete or the like and reinforcing or slipping, the caliber is filled with a rolling material. Some attempt to form protrusions with height. For example, JP-A-62
When rolling and manufacturing a steel plate with protrusions using a caliber roll, as in Japanese Patent No. 54502, rolling is performed using a caliber roll having a caliber depth greater than the maximum value of the protrusion height obtained by rolling. The method is known.

[0003]

These disclosed methods certainly describe means for obtaining an arbitrary protrusion height, and the protrusion height is changed by this means, but the limiting amount is limited. Whether or not it is optimal is just a prospect, and even if it is actually measured, there is only a method of manually measuring or visually confirming it offline after the end of rolling, until obtaining information on the protrusion height, Furthermore, it takes a long time to correct the height of the protrusion as intended, and the accuracy is not sufficient.

On the other hand, the projection height needs to be precisely controlled and controlled in order to control the lowest portion or the highest portion by improving the yield depending on the use of the steel sheet.
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to measure the height of a protrusion with high accuracy so that the management and control thereof can be promptly and optimally performed.

[0005]

Means for Solving the Problems The present invention achieves the above-mentioned object, and the gist of the present invention is: (1) When rolling a steel sheet with a projection parallel to the rolling direction, It is characterized in that a plate thickness gauge located on the machine group exit side or in the middle is moved in the plate width direction, and the projection height is accurately recognized from the plate thickness of each of the obtained steel plate protrusion and base. A method for rolling steel plates with protrusions that have excellent protrusion height accuracy.

(2) When rolling a steel sheet with protrusions parallel to the rolling direction, the amount of walk of the moving sheet of the sheet thickness gauge is determined by the lateral deflection signal of the sheet width gauge located on the exit side or in the middle of the rolling mill. Is corrected to detect the plate thickness of each of the protrusion and the base of the steel plate more accurately, thereby accurately recognizing the protrusion height. Rolling method for steel plate with protrusions.

(3) When rolling a steel plate with protrusions parallel to the rolling direction, the reduction ratio of the rolling mill having the grooved rolls set is changed according to the protrusion height accurately recognized (1) It is a rolling method of a steel plate with protrusions having excellent protrusion height accuracy as described.

The present invention will be described in detail below 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 plate 1 is provided with ordinary grooved rolls 4 on flat rolls 2 and 3, and a steel plate having a projection on one side of the steel plate is continuously rolled in the rolling direction. FIG. 1 shows an example in which the grooved roll 4 is incorporated in the final stand. This last stand is a grooved roll 4
A plate thickness meter 5 movable in the plate width direction is arranged on the downstream side of the plate, and a plate width meter 6 is arranged downstream of the plate thickness meter 5, and the signal thereof is sent to an arithmetic and control unit 7 which is a data processing unit. It is configured to connect.

FIG. 2 is a perspective view showing a steel plate with protrusions according to the present invention. As shown in FIG. 2, as is apparent from the cross-sectional shape of the steel plate with protrusions in the plate width direction, the protrusion 8 and the base 9
In this case, even if an attempt is made to measure the center plate thickness in this case, normally the measurement field of the plate thickness gauge is for measuring only the protrusions 8 of the steel plate and the base portion 9 having no protrusions. There are cases where only one is measured, or both are measured in the field of view. This phenomenon occurs because the rolled material relatively deviates from the center of the rolled material due to the meandering of rolling. Therefore, using the plate thickness signal measured by the conventional method, a normal AGC (Automa) is used.
If an attempt is made to perform the tic gauge control), a hunting phenomenon occurs and the plate thickness cannot be controlled.

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

Further, even if the steel plate moves in the width direction while the plate thickness gauge is moving from one edge to the other edge, the arithmetic control unit uses the lateral deflection signal of the plate width gauge to change the thickness gauge at any time. It is possible to correct the measured position to obtain the plate thickness deviation signal at the arbitrary position in the width direction with higher accuracy, and to recognize the protrusion height 10 with higher accuracy. In addition, the arithmetic and control unit uses the recognition for the projection height 10 with high accuracy,
Calculate the deviation from the desired projection height and the amount of change in the reduction ratio necessary to correct it, and change the reduction ratio of the rolling machine with the grooved roll set at least between the bars or in the bar. As a result, the protrusion height 10 can be optimized.

More specifically, when the plate thickness 9 of the base portion is the target and the projection height 10 is low, the reduction rate of the flat rolls 2 and 3 on the upstream side is reduced and the reduction rate of the grooved roll 4 is reduced. By increasing it, without increasing disturbance to the base plate thickness, and when the projection height 10 is high, the reduction rate of the upstream flat rolls 2 and 3 is increased and the reduction rate of the grooved roll 4 is reduced. By doing so, the projection height 10 can be aimed at without disturbing the base plate thickness.

Further, when the plate thickness 9 of the base portion is not as intended, but the projection height 10 is as intended, the reduction ratio of the grooved roll 4 is maintained and the reduction ratios of the flat rolls 2 and 3 are changed. , Without disturbing the protrusion height 10,
By taking measures such that the base plate thickness 9 can be achieved as intended, conventionally, the management is based on the assumption that the projection height 10 can be achieved as planned, or the management by online hand measurement is insufficient in accuracy. Therefore, it becomes possible to quickly and accurately manage and control the height of the protrusion, which has a large time loss.

[0014]

EXAMPLES Examples of the present invention will be described in detail below. This was carried out by using flat roll Nos. 2 and 3 rolling mills as the implementation equipment as shown in FIG. 1 and No. 4 finishing rolling mill as a grooved roll as a final rolling stand. FIG. 4 shows the deviation in plate thickness between the conventional method and the steel plate with protrusions according to the present invention. That is, FIG. 4A shows a state in which the height of the protrusions fluctuates greatly. On the other hand, FIG. 4 (b) shows the result that by carrying out the present invention, it is possible to accurately control the base portion, the plate thickness, and the height of the projection as desired.

[0015]

As described above, according to the present invention, by accurately measuring the height of the protrusion of the steel sheet with protrusions, it becomes possible to quickly and optimally manage and control the height of the protrusion. The plate thickness accuracy can be obtained, and the excellent effect of improving the yield can be achieved.

[Brief description of 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 plate with protrusions according to the present invention,

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

FIG. 4 is a diagram showing plate thickness deviation states of a steel plate with protrusions according to a conventional method and the present invention.

[Explanation of symbols]

 1 Steel plate 2, 3 Flat roll 4 Roll with groove 5 Plate thickness gauge 6 Plate width gauge 7 Arithmetic control device 8 Projection part 9 Base part 10 Projection height

Claims (3)

[Claims] 1. When rolling a steel plate with protrusions parallel to the rolling direction, a plate thickness gauge located on the rolling mill group side or in the middle is moved in the plate width direction to obtain a protrusion and a base of the obtained steel plate. A method for rolling a steel sheet with protrusions having excellent protrusion height accuracy, which is characterized by accurately recognizing the protrusion height from each plate thickness. 2. When rolling a steel plate with protrusions parallel to the rolling direction, the amount of walk of the moving plate of the plate thickness gauge is determined by the lateral deflection signal of the plate width gauge located on the output side or in the middle of the rolling mill. The projection having excellent projection height accuracy according to claim 1, wherein the projection height is accurately recognized by correcting and detecting the plate thickness of each of the projection portion and the base portion of the steel sheet with higher accuracy. Method for rolling steel sheet with marking. 3. When rolling a steel sheet with protrusions parallel to the rolling direction, the reduction ratio of the rolling mill with the grooved rolls set is changed according to the height of the protrusions accurately recognized. A method for rolling a steel sheet with protrusions having excellent protrusion height accuracy as described.