JP2002301517A - Method for deciding labeling position of untrimmed steel plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for automatically, not visually, judging a flat part on a side edge face of a steel plate where is suitable for laveling when performing labeling on the side edge face of the steel plate. SOLUTION: When performing the labeling on the side edge face of the steel plate as-rolled, in this method for deciding the labeling position on a untrimmed steel plate, a shape detector for the side edge of the steel plate for measuring the shape of the side edge face of the steel plate is arranged in a position facing to the side edge face of the steel plate and the shape of the side edge face of the steel plate is measured with the shape detector. On the basis of this measured shape of the side edge face of the steel plate, whether the flat part having an area on which the labeling is enabled exists within the preset range or not is judged, in the case that the flat part exists, that part is taken as a labeling position and, in the case that the flat part does not exist, the middle part in the thickness direction in the side edge face part of the steel plate is taken as a labeling position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining an optimum position when labeling (hereinafter, referred to as labeling) a side end face of an as-rolled steel sheet.

[0002]

2. Description of the Related Art When a slab is rolled into a steel plate, the side surface in the width direction of the steel plate does not always become a smooth surface, but becomes a side end (a lug) where irregularities are generated. This rolled steel plate (thick plate)
In general, the ears are sheared to provide a smooth surface.However, products that are shipped to users while retaining the shape of the rolled ears without shearing the steel plate ears is there.

[0003] This accounts for about 30% of the rolled material, and is usually referred to as a material with lugs. It was necessary to display the history of the material by a side label (recorded in characters) on the side end face of the steel sheet, and labeling was performed for that purpose.

Conventionally, the labeling point on the steel plate side end face is:
In the length direction of the steel plate side end surface, a preset location (for example, 3 m from the steel plate tip) was specified, so that the label display was inevitably in a determined position. In addition, in the thickness direction of the steel plate, the thickness is indicated near the center of the thickness, and this position is also specified.

[0005] Accordingly, even if the shape of the portion at the position corresponding to the labeling to the steel plate side end surface is uneven due to the wrapping generated during rolling or the like and the shape is considered to be unsuitable in shape, the shape does not matter. Labeling at a predetermined position without being concerned.

In labeling in such a situation, the displayed character must be obscure due to a shape defect at the corresponding position, and sometimes the labeled character is displayed along the uneven shape. In some cases, an inconvenience such as the inability to read the displayed characters was observed.

[0007]

As described above, since the above-mentioned inconveniences occur, regarding labeling, regardless of whether characters and symbols can be read or not, the operator checks all the steel sheets in the post-process. After confirming the quality of the label display that is required and labeling is not clear, for labels that are difficult to read due to unclear display, repairs are performed so that they can be read by reworking, or labeling is redone. Was.

[0008] As described above, in the current labeling work on the steel sheet side end face, excessive labor is applied to the operator, and there is a strong demand for the development of labeling capable of reducing this labor. A countermeasure in a form that would lead to cost reduction due to labor saving was an issue.

The present invention provides a method for automatically judging a flat portion on a steel plate side end surface suitable for labeling without visually checking the labeling on the steel plate side end surface in response to the above demand. Aim.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the conventional method, and its gist lies in the following means. (1) When labeling the as-rolled steel sheet side end face, a steel sheet side end face shape detecting device for measuring the shape of the steel sheet side end face is provided at a position facing the steel sheet side end face, and the shape detecting device detects the steel sheet side end face. Measure the shape of the end face, based on the measured shape of the end face of the steel plate side, determine whether there is a flat portion of a width that can be labeled in a preset range, if there is a flat portion A method for determining the label display position of the steel plate with ears, using that as the label display position.

(2) When labeling the steel sheet side end face in the above (1), a steel sheet side end face shape detecting device for measuring the shape of the steel sheet side end face is provided at a position facing the steel sheet side end face. The shape of the steel plate side end surface is measured by the shape detection device, and based on the measured shape of the steel plate side end surface, it is determined whether or not there is a flat portion having a width capable of displaying a label within a preset range, and the flatness is determined. A method for determining a label display position of a steel plate with ears, wherein a label display position is a central portion in a thickness direction of a steel plate side end surface when there is no part. (3) In the measurement of the steel sheet side end face by the steel sheet side end face shape detecting device of the above (1) or (2), when a drop occurs in the measured data, the ear is supplemented by the data before and after the measurement of the missing part data. How to determine the label display position of the steel plate.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have studied various problems in applying a label to the end face of a steel sheet, and have found that the end face of the steel sheet is as flat as possible instead of labeling at a predetermined place as in the prior art. Measure the shape of the steel plate side end face to find the flat part based on the belief that if the label is displayed on the part, it will be possible to reduce the difficulty of reading the displayed label As a means, if a steel plate side end surface shape detecting device (hereinafter, referred to as a distance sensor) is adopted, it has been thought that a flat portion of the steel plate side end surface can be easily detected.

Therefore, the present inventors arranged a distance sensor for detecting the shape of the steel plate side end face at a position facing the steel plate side end face, and measured the shape of the steel plate side end face with the distance sensor. It is determined whether or not there is a flat portion having a width capable of displaying a label within a preset range on the steel plate side end surface. That is, the shape of the steel plate side end face is determined by measuring the shape of the steel plate side end face successively with a distance sensor to accurately grasp the shape of the steel plate side end face and transmitting that information to the next process. Therefore, by performing an appropriate response process in the next step according to the above, the labeling process on the steel sheet side end surface is to be performed as appropriately as possible.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a simplified side view of a cross section of a steel plate side end face viewed from the side. A distance sensor 2 for measuring the shape of the steel plate side end face 1 is disposed at an appropriate distance from the steel plate side end face with respect to the steel plate side end face. It is installed at a position where it is parallel and faces the steel plate side end face from the side. By emitting a laser beam from the distance sensor 2 toward the side end surface 1 of the steel plate, the light beam is reflected on the steel plate side end surface 1 and is reflected to return to the distance sensor 2 as a reflected light beam. The distance between the sensor 2 and the steel plate side end surface 1 is measured.

In this case, by scanning the laser beam in the thickness direction of the steel sheet (each dotted line in the figure indicates the state at the time of scanning), the reflected light distance from each position in the thickness direction of the steel sheet is continuously measured. By measuring the distance, it is possible to know the shape of the surface at the steel plate side end face in the thickness direction depending on the fluctuation state of the distance. That is, it is possible to accurately grasp whether the shape is a flat shape or an uneven shape.
In the measurement of the side end face shape in the longitudinal direction of the steel sheet, since the steel sheet itself is sequentially transferred (conveyed to the downstream process), it is not necessary to scan the laser beam of the distance sensor 2 in the longitudinal direction. Can be measured sequentially according to the movement of the steel sheet.

Here, the concept of the selection of the labeling position will be described. Based on information (signal) from the distance sensor 2 measuring the shape of the steel plate side end surface, a predetermined length position in the longitudinal direction of the steel plate is used. An object of the present invention is to analyze the surface shape in the thickness direction of the device and find a flat portion that can be labeled. This is shown in FIG. 2, and FIG. 2 shows a cross section in the thickness direction of the steel sheet. The thickness of the steel sheet indicated by α and β is a dead zone (plate thickness) from the upper and lower surfaces of the steel sheet, respectively. Is set in accordance with. Therefore, whether or not a flat portion having a thickness of t (for example, a minimum of 2.5 mm) exists at a position excluding this portion can be known by analyzing information from the distance sensor 2.

That is, since the scanning interval (for example, 0.5 mm interval) of the distance sensor 2 in the thickness direction is determined, if the difference between the values measured in the previous and subsequent scans is within a preset range, the flatness is obtained. It is determined that there is, and if it is out of the set range, it is determined that the surface is not flat but uneven. Further, the determination of the thickness t at which the flat portion continues is determined based on the scan interval and the number of scans in which the state in which the flat portion can be determined continues. Here, h is a value obtained to determine the center of the position at the time of labeling, and is a position obtained by adding the center thickness t / 2 of the determined thickness t of the flat portion to the dead zone α on the upper surface of the steel plate.

According to the information obtained by analyzing the signal from the distance sensor 2, if there is a flat portion on the steel plate side end surface where the thickness t can be secured in the labeling operation, the obtained h is calculated. Label at a flat position as the center. However, if the flat part suitable for labeling is not present, performs labeling in the center <br/> position of the plate thickness in the same manner as in the method of the conventional.

In this case, the operator is instructed to check the labeling state. Thereafter, the operator checks the labeling portion, and if the printed characters are unclear and unreadable, the displayed characters are clarified by reworking. Repair or relabel the part so that it is legible. As described above, since information on a steel sheet that needs to be checked at the labeling location is known in advance, it is sufficient to check only the steel sheet, and it is unnecessary to check all steel sheets.

In order to recognize the flatness at the labeling position of the end face on the steel plate side, a completely smooth surface is not always required, and even if there is some unevenness, the flatness allowable reference value is set in advance. If the flat part falls within the reference range, it is determined that there is a labelable part. The flat portion is preferably a vertical surface at the steel plate side end surface, but may be a slightly inclined surface. That is, in the present invention, even when the reference value is not satisfied on the vertical surface, when a flat portion exists on a moderately inclined surface at a position not including a steep portion, an evaluation criterion corresponding to the inclined surface is used. The evaluation was performed by incorporating (inclined surface correction). If the value was within the range satisfying the reference value, the inclined surface was recognized as a flat portion, and the portion was labeled.

When the distance sensor 2 measures the distance of the steel plate side end surface, it cannot be measured because water or oil or other foreign matter has adhered to the steel plate side end surface (irregular reflection of a laser beam). Data may be lost. When such a situation occurs, when the number of missing data is small, the missing portion is approximated to a straight line based on the measurement data before and after the missing portion and the data is complemented to determine whether or not there is a flat portion. . Further, when there is a large amount of missing data and the flat portion cannot be determined due to a certain amount or more, after labeling the central portion in the thickness direction, the operator is instructed to check the labeling state.

As described above, in the present invention, a portion suitable for label display (a flat portion on the steel plate side end surface) is selected by detecting the shape of the steel plate side end surface in advance by the distance sensor, and the portion is selected. By labeling, clear characters can be displayed.

[0023]

According to the present invention, it is possible to determine whether or not there is a flat portion in the thickness direction of the steel plate side end face at the time of labeling by processing information from the steel plate side end face shape detecting device, so that label display is possible. It is possible to determine whether or not the position is a flat portion, and the amount of work required for the rework in the post-process is significantly reduced, which makes it easy to save labor, and greatly contributes to the reduction of work costs.

[Brief description of the drawings]

FIG. 1 is a simplified side view of a cross section of an end surface of a steel plate side viewed from the side.

FIG. 2 is a diagram showing a concept of selecting a label display position.

[Explanation of symbols]

 1 Steel plate end surface 2 Steel plate end surface shape detection device (distance sensor)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Honda Oita, Oita, Oita 1

Claims (3)

[Claims] When a label is displayed on an as-rolled steel sheet side end face, a steel sheet side end face shape detecting device for measuring the shape of the steel sheet side end face is provided at a position facing the steel sheet side end face. Measure the shape of the steel plate side end face, based on the measured shape of the steel plate side end face, determine whether or not there is a flat portion of a width that can be labeled in a preset range,
If there is a flat portion, the label display position is set as the label display position. 2. A steel plate side end surface shape detecting device for measuring a shape of the steel plate side end surface at a position facing the steel plate side end surface in performing label display on the steel plate side end surface according to claim 1; The shape of the steel plate side end surface is measured by the detection device, and based on the measured shape of the steel plate side end surface, it is determined whether or not there is a flat portion having a label display area within a preset range, and the flat portion is determined. A method of determining a label display position of an ear-attached steel plate, wherein a label display position is set at a central portion in a thickness direction of an end surface of the steel plate when no steel plate exists. 3. In the measurement of the steel sheet side end face by the steel sheet side end face shape detecting device according to claim 1 or 2, when a dropout occurs in the measurement data, it is supplemented by data before and after the measurement of the dropout data. A method of determining the label display position of the featured steel plate with ears.