JPH0223245B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a shape measuring device for H-section steel that continuously measures the flange width and center deviation of H-section steel during rolling. Generally, rough rolling of H-beam steel is performed by a universal mill (hereinafter abbreviated as U mill) and an edge mill (hereinafter abbreviated as E mill).
In rough rolling, the width of the H-section steel after being rolled by a U mill is not constant due to the widening of the flange, and generally the width becomes larger at the middle part. Thereafter, the flange end is rolled down by an E mill so that the flange width is constant. However, with the current rolling method, it is difficult to roll with a constant flange width due to the above-mentioned width expansion. The solution is to measure the flange width between the U mil and the E mil, and calculate the E
If the roll reduction amount of the mill is changed from time to time based on the flange measurement value, rolling with a constant flange width becomes possible. This has been confirmed by the inventor's actual machine tests. To perform such control, it is necessary to continuously measure the flange width between the U mill and the E mill, but this measurement technique has not yet been established. The reason for this is that the U mill and the E mill are generally close to each other (within 5 meters), and the attached equipment of the rolling mill is
For example, since there is a bridge guide, there is less space for installing the sensor. Furthermore, H-beam steel generally has a complicated shape, which delays theoretical rolling analysis. The widening of the flange in U-mill rolling is an important factor, but
Conventionally, there was no means to measure the flange width immediately after U-mill rolling, so quantitative analysis was difficult. On the other hand, the center deviation of H-section steel is a quality characteristic that indicates the amount of deviation of the web position from the center of the flange, and this is a factor that causes problems during joining when H-section steel is used for steel structures. The center deviation is not constant in the entire length direction (rolling direction), and generally there is a tendency for the center deviation to become larger at the top and bottom parts. At present, a method for controlling center deviation during rolling has not yet been established, and operations have only been carried out by changing the level of the U-mill entrance table based on experience. The reason for this is that there was no means to continuously measure the center deviation in the entire length direction immediately after U-mill rolling. In order to measure center deviation, there are many problems, such as: (1) H-beam running conditions such as horizontal and vertical vibrations and meandering of the H-beam while it is running on the table; poor alignment accuracy; There were many problems with the above measurements. (2) The size range of H-beams is wide, for example from 200 (mm) x 100 (mm) to 900 (mm) x 400 (mm), and in order to measure all of these H-beams, Therefore, peripheral engineering such as sensor positioning becomes complicated. There is a problem. As described above, although there has been a strong desire to continuously measure the flange width and center deviation of H-section steel during rolling, there is still no means for this measurement. The present invention was invented in view of this situation, and it continuously measures the flange width and center deviation of H-beam steel during rolling, and based on these measurements, various mill settings such as roll opening can be adjusted. An object of the present invention is to provide a shape measuring device for H-section steel that enables improvement in the dimensional accuracy of H-section steel through control. The H-section steel shape measuring device according to the present invention is composed of a web top surface distance meter, a web bottom surface distance meter, an upper flange end detector, a lower flange end detector, and a calculation device. The web underside distance meter is attached to the bridge guide. This bridge guide is installed between the U mill and the E mill, and has a first side wall having a first guide surface that guides the upper inner surface of the flange of the H-section steel being rolled, and a first side wall that guides the lower inner surface of the flange. a second side wall having a second guide surface, an end of the first side wall and an end of the second side wall are opposite to each other via a web of H-beam steel; A third side wall is provided facing the first guide surface and the second guide surface. a web top rangefinder is attached to the first side wall of the bridge guide on a surface opposite the first guide surface;
Measure the distance from the top surface of the H-shaped steel web. The web underside rangefinder is located on the second side of the bridge guide.
It is attached to the opposite side of the guide surface and measures the distance from the lower surface of the H-beam web. The upper flange end detector is the third part of the bridge guide.
The upper flange end position is detected through a slit provided in a portion of the side wall facing the first guide surface. The lower flange end detector detects the lower flange end position via a slit provided in a portion of the third side wall of the bridge guide facing the second guide surface. The calculation device calculates the shape of the H-beam being rolled based on the output of the web top surface distance meter, the output of the web bottom surface distance meter, the output of the top flange end detector, and the output of the bottom flange end detector. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of rough rolling of H-beam steel, FIG. 2 is an enlarged sectional view of the bridge guide in FIG. 1, and FIG. 3 is each sensor of the H-beam shape measuring device according to an embodiment of the present invention. FIG. 4 is a block diagram of the shape measuring device. In rough rolling of H-section steel, as shown in Fig. 1, a U mill 1 and an E mill 2 are arranged in series, and the U mill 1 and E mill 2 are integrated into reverse rolling. . A bridge guide 3 is disposed between the U mill 1 and the E mill 2. The present invention
This bridge guide 3 is actively used to measure the flange width B and center deviation S of the H-section steel 4 during rolling.The reason for using this bridge guide is as follows. It is. When the H-section steel 4 runs inside the bridge guide 3, the gap between the inner surface of the flange of the H-section steel 4 and the inner wall of the bridge guide 3 is kept within 5 (mm), so the lateral vibration of the H-section steel 4 while running is It is extremely small and advantageous in terms of measurement. On the other hand, since the H-shaped steel 4 is fixed by the U mill 1 and the E mill 2 during rolling, the vertical fluctuation is within about 20 (mm). The amount of shaking during this running is much smaller than that during running on the table. Next, the arrangement of various sensors of the apparatus according to this embodiment and their detected amounts will be explained based on FIG. 3. The relationship between the detected part of the H-section steel and the sensor that detects it is as follows. Upper flange end 4F1; sensor 51 Lower flange end 4F2; sensor 52 Upper web surface 4W1; sensor 61 Lower web surface 4W2; sensor 62 These sensors 51, 52, 61, and 62 are all located in the vertical direction of the detected portion. The detection amount of each sensor is as follows. sensor 51; b1 sensor 52; b2 sensor 61; l1 sensor 62; l2 Since the sensors 51, 52, 61, and 62 are all fixed to the bridge guide 3, the relative positional relationship of these sensors is constant. Therefore, the distance L between the centers of sensors 51 and 52 in FIG. 3, the distance L1 between the detection end of sensor 61 and the center of sensor 51, and the distance between the detection end of sensor 62 and the center of sensor 52.
L2 is each constant. If the sensors are arranged as described above, the flange width B and center deviation S can be determined from the detection amount of each sensor using the following equation. B=L+(b1+b2)...(1) S=(l1+b1+L1)-(l2+b2+L2)/2...(2) In order to continuously measure the above B and S in the entire length direction of the H-section steel, the detection amount It is sufficient to simultaneously detect l1, l2, b1, and b2 from time to time, and calculate equations (1) and (2) above each time they are detected using the calculation device 7 shown in FIG. In the manner described above, the flange width and center deviation S of the H-section steel can be continuously measured over the entire length direction. Next, each sensor and arithmetic device will be explained. (i) Sensors 51, 52 (upper and lower flange end position detectors) These sensors optically detect the flange end position 4.
This is a sensor that detects F1 and 4F2. In the device of the embodiment, a linear array camera is used, and the slit holes 31 and 32 provided in the bridge guide 3 are used.
Look at the flange end through the
The boundary position between the infrared energy from the H-shaped steel being rolled and the back of the field of view is detected. The reason for using a linear array here is that it is small and can be installed even in the narrow space between the U mill and the E mill, and since it is a solid element, it can withstand the vibrations of the bridge guide. There is a particular thing. By the way, in position detection using such an optical camera, the optical image expands or contracts as the distance between the camera and the object changes, so it is necessary to perform distance correction. However, as shown in FIG.
For example, if attached to the upper flange end 4F1
is maintained within 5 mm on the inner wall of the bridge guide, and the distance between the sensor 51 and the end portion 4F1 is maintained constant with an accuracy of at least 5 (mm). Therefore, in this device, there is no need for the above-mentioned distance correction. In addition, although the sizes of H-shaped steel generally vary, even if the size changes, the operational standard is such that the gap between the upper flange end 4F1 and the inner wall of the bridge guide is kept within 5 (mm). The distance is kept constant for the reasons mentioned above. In conventional devices for measuring the flange width of H-section steel on a turntable, the camera was positioned horizontally each time the size was changed, but with this device, this is no longer necessary. (ii) Sensors 61 and 62 (upper and lower web surface distance meters) These sensors detect the distances l1 and l2 from the detection end of each sensor to the web surfaces 4W1 and 4W2. The mounting position is as shown in FIG. 3, but from the viewpoint of mounting space, it is necessary to use a sensor that is small and resistant to bad atmosphere. This device uses a water flow ultrasonic distance meter (for example, Japanese Patent Application No. 55-159394), but any distance meter that is small and can withstand adverse atmospheres would be suitable.
It is not necessary to be limited to this embodiment, and for example, a laser beam cutting distance meter or the like may be used. (iii) Computing device 7 This computing device calculates the detection amount l1 from each sensor,
It inputs l2, b1, and b2, calculates the above equations (1) and (2), and outputs the flange width B and center deviation S. This device uses a microcomputer to output calculations every 5 (msec). Of course, the above equations (1) and (2) may be detected using an analog circuit. In the above embodiment, a device for measuring the flange width B and center deviation S of the right half of the H-section steel was described, but the B and S can also be measured for the right half using a similar device. As is clear from the above description, according to the H-section steel shape measuring device according to the present invention, the shape of the H-section steel guided by the bridge guide can be measured using the web upper surface distance meter, the web lower surface distance meter, and the upper flange end. Since measurements were made using the detector and the lower flange end detector, the flange width and center deviation S of the H-section steel during rolling can be measured continuously and with high precision. In this way, when B and S are measured continuously, various mill controls such as roll opening can be performed based on these measured values, making it possible to improve the dimensional accuracy of H-section steel. There is.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of rough rolling of H-beam steel, FIG. 2 is an enlarged sectional view of the bridge guide in FIG. 1, and FIG. 3 is each sensor of the H-beam shape measuring device according to an embodiment of the present invention. FIG. 4 is a block diagram of the shape measuring device. 1...U mill, 2...E mill, 3...Bridge guide, 4...H section steel, 51, 52, 61, 62
...Sensor, 7...Arithmetic device.

Claims (1)

[Claims] 1. A first side wall provided between the U mill and the E mill and having a first guide surface for guiding the upper inner surface of the flange of the H-section steel during rolling, and the lower side of the flange. a second side wall having a second guide surface for guiding the inner surface of the first side wall, and an end of the first side wall and an end of the second side wall are opposed to each other via a web of H-beam steel. , and a third side wall provided opposite to the first guide surface and the second guide surface. A web top surface distance meter 61 that measures the distance to the top surface of the web of the H-shaped steel; Measuring web bottom surface distance meter 62
and an upper flange end detector 51 for detecting the upper flange end position via a slit provided in a portion of the third side wall of the bridge guide opposite to the first guide surface; a lower flange end detector 52 that detects the lower flange end position through a slit provided in a portion of the side wall facing the second guide surface; , an arithmetic device 7 for calculating the shape of the H-section being rolled based on the output of the upper flange end detector and the output of the lower flange end detector. shape measuring device.