JP3225001B2 - H-section flange edge detection method and H-section flange temperature measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting an edge of an H-section steel flange and an apparatus for measuring the temperature of the flange.

[0002]

2. Description of the Related Art It is important to make the flange and web temperatures of an H-section steel as uniform as possible in order to produce an H-section steel having a good finished shape in a hot rolling line of an H-section steel at a steel mill. . On the other hand, since the intersection between the flange and the web (hereinafter referred to as “fillet”) is harder to cool than other portions, a method of water cooling aiming at the fillet is adopted. In order to control the nozzle angle for water cooling, the amount of cooling water, and the like, it is necessary to accurately measure the temperature distribution of the flange before and after water cooling. Since the H-section steel is a moving body, it is measured by a radiation thermometer (radiation thermometer) provided beside the table roll.

FIG. 8 is a diagram showing the principle of measuring the temperature of a conventional H-shaped steel flange, in which a radiation thermometer 104 measures the temperature of a flange 103 of an H-shaped steel 102 running on a table roll 101 in the front and rear directions of the drawing. In addition, the radiation thermometer 104 takes in a plurality of pieces of temperature information by rotating the built-in mirror within the range of the scanning angle θ (for example, 60 °).

[0004]

However, in an actual production line, since the H-section steel 102 swings right and left, the side guides 105 and 106 are attached so as not to jump out of the line. However, as shown by the imaginary line, one of the side guides 105 needs to be removed or largely cut out to interfere with the scanning angle of the radiation thermometer 104. If the side guide 105 is notched largely, a trouble such as the tip of the H-shaped steel 102 being caught in the notch occurs. That is, the configuration of FIG. 8 in which the radiation thermometer 104 is arranged right beside the flange 103 is likely to cause a problem in practical use. Therefore,
An object of the present invention is to provide a technique that allows a side guide and a radiation thermometer to coexist.

[0005]

In order to solve the above-mentioned problems, a first aspect of the present invention is based on a plurality of pieces of temperature information near the other end of one flange and scanning angle information corresponding thereto.
Specifying the point where the temperature deviation is the maximum as the other end point E1 of the flange; and defining the angle between the optical axis of the radiation thermometer and the point E1 as the scanning angle θ1, and setting the angle perpendicular to the other end point E1 Calculating a distance L from the radiation thermometer to one of the flanges based on the horizontal distance H and the scanning angle θ1; and calculating one end of the flange from a point E1 based on the flange width W information of the finished product and the distance L information. Calculating the scanning angle θ2 up to the vicinity, extracting temperature information near one end of the flange from the temperature information group based on the scanning angle θ2 information, finding a minimum point of temperature in the temperature information, Identifying the position of the point as one end E2 of the flange.

[0006] Even if one of the flanges and a part of the other flange are continuously measured, the boundary between the two flanges can be specified, so that the radiation thermometer can be freely arranged.
Therefore, the side guide and the radiation thermometer can coexist, and the temperature of the flange can be measured while suppressing the meandering of the H-shaped steel with the side guide.

A second aspect of the present invention is that the H
A table roll that horizontally transports the section steel, and a standard size H
A side guide for preventing the lateral deflection of the H-section steel at a height not exceeding the height of the web of the section steel, and a scanning type disposed at a position beyond one end of one flange so that the other flange can be seen. An H-shaped steel flange temperature measuring device is constituted by a radiation thermometer and identification means for distinguishing the obtained temperature information into that of one flange and that of the other flange.

[0008] The side guide and the radiation thermometer can coexist, and while the side guide suppresses the meandering of the H-section steel,
The temperature of the flange can be measured. Since the configuration is simple, it is possible to modify an existing production line.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a principle diagram of an apparatus for measuring the temperature of an H-shaped steel flange according to the present invention. The temperature measuring apparatus 1 for an H-shaped steel flange is a table roll that horizontally transports an H-shaped steel 3 while keeping a web 2 horizontal. 4, side guides 5, 5 for preventing the lateral deflection of the H-section at a height not exceeding the height of the standard-size H-section web 2, and the other beyond one end 6 a of one flange 6. A scanning radiation thermometer 8 in which the flange 7 is also placed in the field of view, an identification means 9 for distinguishing the obtained temperature information into that of one flange and that of the other flange, and a display unit 10. Consists of

Since the side guides 5, 5 cover substantially the lower half of the H-section steel 3, the side guides function sufficiently. On the other hand, the radiation thermometer 8 measures the temperature of one flange 6 from the bottom to the top over the entire width in a form in which the H-beam 3 is viewed from the top. However, as a cost, the temperature of the other flange 7 is measured beyond one end 6a of the one flange 6.

Therefore, the present invention is characterized in that the temperature of one flange and the temperature of the other flange are identified by the identification means 9 by the following method. FIG. 2 is an explanatory diagram for obtaining the other end point E1 of the flange. While scanning the radiation thermometer 8 as indicated by arrows at positions P1, P2,..., The temperatures T1, T2,.・ ・ Measure. That the upper surface of the table roll 4 (referred to as a pass line) does not change, that the radiation thermometer 8 is fixed above the pass line by a distance H1, that the position of the flange 6 in the horizontal direction in the drawing is within a certain width, To flange 6
The temperature can be measured in the vicinity of the lower end (the other end) of FIG.

FIGS. 3A and 3B show another end point E of the flange.
FIG. 4 is an explanatory diagram for specifying 1 (the vertical axis is placed on the right for convenience of description). In (a), the horizontal axis is the measurement position, and the vertical axis is the temperature. The temperature is low at the position P1 outside the flange, but the temperature is high at the positions P3 and P4 inside the flange, and
Is the transition period. In (b), the horizontal axis indicates the measurement position, and the vertical axis indicates the temperature difference. When the temperature difference ΔT is calculated as (T2−T1) or (T3−T2), the temperature rapidly changes around the position P2. A maximum point of the temperature deviation exists at the position P2.
Thus, the other end point E1 of the flange 6 (see FIG. 2)
To identify.

FIG. 4 is an explanatory diagram for obtaining the distance L from the radiation thermometer to the flange. From the results of FIGS. 2 and 3, the angle θ1 to the point E1 with respect to the optical axis R of the radiation thermometer is shown.
Can be calculated. Then, from this θ1 and the known H1,
The distance L can be calculated from the equation L = H1 / tan θ1. Since the H-section steel 3 swings right and left in the figure, the distance L is not always constant. Therefore, the distance L is obtained by performing a geometric operation.

FIG. 5 is an explanatory diagram for obtaining the scanning angle θ2. The width of the flange 6 is W due to thermal expansion when hot.
The width W1 is unknown at this time.
Therefore, the flange width W of the finished product is used. H1, L
And W are determined, the scanning angle θ2 can be geometrically calculated.

FIG. 6 is a graph showing the relationship between the temperature curve and the position in the step of FIG. 5. The vertical axis represents temperature information, the horizontal axis represents position information, a is a portion on the other end point E1 side of the flange, and b is a portion. Fully locally cooled fillets, c indicates the local maximum or minimum point of the flange near one end and f indicates the other flange. Assuming that a point away from the point E1 by W along the horizontal axis is E3, the temperature is still high at the point E3, as is clear from FIG. However, there should be one end point of the flange (allowing for thermal expansion) near this point E3. Therefore, the minimum point d near the point E3 is found in FIG. 6, and this point is specified as one end point E2 of the flange.

FIG. 7 is an image diagram of a temperature curve of a flange processed in the present invention. For example, if an unnecessary portion in FIG. 6 is deleted and a center line C is set at the center between points E1 and E2, on-time is achieved. The temperature distribution of the flange at that time can be known. Although not described in detail, the water cooling nozzle (injection angle, injection water amount) may be adjusted to flatten the temperature distribution while observing the temperature distribution of the flange. Of course, it is preferable to send the temperature information and the position information to the water cooling control unit online to automate the water cooling control.

In the first aspect, the H-section steel can be applied to any of horizontal rolling in which the web is horizontal, horizontal processing in which the web is oriented vertically, and vertical rolling in which the entire web is oriented vertically.

In FIG. 2, since the scanning angles at the positions P1, P2,... Are the same, the projected area becomes smaller as the position is closer to the horizontal axis. That is, the projection area is not uniform on the flange surface. Therefore, the pitch may be equalized inside the identification means 9. That is, in claim 1, the scanning angle θ2 is adopted for convenience, and may be represented by an element equivalent to the scanning angle θ2, for example, a projection plane (including an aggregate) after correction.

[0019]

According to the present invention, the following effects are exhibited by the above configuration. Claim 1 is a step of specifying a point having a maximum temperature deviation as the other end point E1 of the flange based on a plurality of pieces of temperature information near the other end of one flange and scanning angle information corresponding thereto, and a radiation thermometer. The angle formed between the optical axis of the point E1 and the point E1 is referred to as a scanning angle θ1.
Calculating a distance L from the radiation thermometer to one of the flanges from the vertical or horizontal distance H up to 1 and the scanning angle θ1; and obtaining a point from the flange width W information of the finished product and the distance L information. Calculating the scanning angle θ2 from E1 to the vicinity of one end of the flange; extracting temperature information near the one end of the flange from the temperature information group based on the scanning angle θ2 information; A step of finding a minimum point and specifying the position of the point as one end E2 of the flange.

Even if one of the flanges and a part of the other flange are continuously measured, the boundary between the two can be specified, so that the radiation thermometer can be freely arranged. Therefore, the side guide and the radiation thermometer can coexist, and the temperature of the flange can be measured while suppressing the meandering of the H-shaped steel with the side guide.

The second aspect of the present invention is that the H
A table roll that horizontally transports the section steel, and a standard size H
A side guide for preventing the lateral deflection of the H-section steel at a height not exceeding the height of the web of the section steel, and a scanning type disposed at a position beyond one end of one flange so that the other flange can be seen. An H-shaped steel flange temperature measuring device is constituted by a radiation thermometer and identification means for distinguishing the obtained temperature information into that of one flange and that of the other flange.

The side guide and the radiation thermometer can coexist, and while the side guide suppresses the meandering of the H-section steel,
The temperature of the flange can be measured. Since the configuration is simple, it is possible to modify an existing production line.

[Brief description of the drawings]

FIG. 1 is a principle diagram of an apparatus for measuring the temperature of an H-section steel flange according to the present invention.

FIG. 2 is an explanatory diagram for obtaining the other end point E1 of the flange.

FIG. 3 is an explanatory diagram for specifying the other end point E1 of the flange.

FIG. 4 is an explanatory diagram for obtaining a distance L from a radiation thermometer to a flange.

FIG. 5 is an explanatory diagram for obtaining a scanning angle θ2.

FIG. 6 is a graph showing a relationship between a temperature curve and a position in the step of FIG. 5;

FIG. 7 is an image diagram of a temperature curve of a flange processed by the present invention.

FIG. 8 is a diagram showing the principle of measuring the temperature of a conventional H-shaped steel flange.

[Explanation of symbols]

1 ... H-shaped steel flange temperature measuring device, 2 ... Web, 3 ...
H-section steel, 4 ... Table roll, 5 ... Side guide, 6 ...
One flange, 7 ... The other flange, 8 ... Scanning radiation thermometer, 9 ... Identification means, 10 ... Display unit, E1 ... The other end of the flange, E2 ... One end of the flange, R ... Light of the radiation thermometer axis.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-136213 (JP, A) JP-A-7-120235 (JP, A) JP-A-4-320911 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) G11B 11/00-11/30 102 G11B 21/00-21/32 G01J 5/00-5/62

Claims (2)

(57) [Claims] When measuring the temperature of one flange of an H-section steel with a radiation thermometer that scans in the width direction of the flange, the radiation thermometer goes beyond one end of one flange and also looks at the other flange. A method for detecting an edge of an H-shaped steel flange when the edge is located at a position, based on a plurality of pieces of temperature information near the other end of one flange and scanning angle information corresponding to the plurality of pieces of temperature information, a point at which a temperature deviation is maximum. Is defined as the other end point E1 of the flange, and the angle between the optical axis of the radiation thermometer and the point E1 is determined by a scanning angle θ.
Calculating the distance L from the radiation thermometer to one of the flanges from the vertical or horizontal distance H from the radiation thermometer to the other end point E1 and the scanning angle θ1, and the flange width W of the finished product From the information and the distance L information,
Calculating a scanning angle θ2 from the point E1 to the vicinity of one end of the flange; extracting temperature information near the one end of the flange from the temperature information group based on the scanning angle θ2 information; Finding the minimum point of (1) and specifying the position of the point as one end E2 of the flange. 2. A table roll for horizontally transporting an H-section steel while keeping the web horizontal, and preventing a horizontal run-out of the H-section steel at a height not exceeding the height of the web of a standard size H-section steel. A side guide, a scanning radiation thermometer arranged at a position beyond one end of one flange so that the other flange is also in the field of view, and the obtained temperature information of one flange and that of the other flange. A temperature measuring device for an H-shaped steel flange, comprising an identification means for distinguishing the temperature.