JPH03160313A - Thickness measuring apparatus at edge of steel plate - Google Patents

Abstract

PURPOSE:To correctly detect in real time whether the thickness of a plate is good by obtaining the measuring position to measure the thickness of the plate based on the information of the position ensuring the plate thickness from a host computor and through correction of the thermal expansion, and measuring the plate thickness at the obtained position. CONSTITUTION:Plate thickness detectors 3a, 3b which detect the thickness of a plate at many points in response to arcuate beams 2a, 2b of radiation are provided in U-shaped moving frames 1a, 1b, respectively. The position of the detectors 3a, 3b is detected by detecting devices 5a, 5b. An operating device 6 continuously operates the width of the plate from the positional information of the frame detected by the detectors 5a, 5b and edge information from the detectors 3a, 3b. On the other hand, a thickness ensuring position from the position of the plate sensors is indicated to the operating device 6 from a host computor 7, so that the thermal expansion is corrected based on the indicated value and the plate width. Since the plate thickness is measured at this measuring position, the thickness can be correctly judged in real time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a steel plate edge thickness measuring device.

[Prior Art] In general, the widthwise cross-sectional shape of a steel plate on a hot rolling line is thick at the center, becomes thinner toward the side edges (hereinafter referred to as edges), and rapidly decreases near the edges (hereinafter referred to as edges). It has a cross-sectional shape (hereinafter referred to as a profile) (referred to as an edge drop).For such a profile,
It is necessary to guarantee the plate thickness over the entire length and width of the hot coil. However, in the conventional hot rolling finishing process, sheet thickness control is performed by superimposing the full length thickness measurement using a single-point measurement thickness meter at the center of the sheet and the sheet profile measurement in the hot coil 1 to 3 times using a width direction scanning thickness meter. It's here.

However, with this combination of board thickness management methods, it is not possible to determine whether the edge thickness is acceptable or not in real time. ■There were problems such as the risk of omissions in pass/fail judgments.

On the other hand, in order to fundamentally solve the above-mentioned problem as a plate thickness gauge, a multi-channel Xl
Thickness gauges that measure the total length and thickness of at least the edge portion of a plate are beginning to be used. However, for this continuous thickness gauge in the width direction, although edge position recognition methods have been considered as in the example of JP-A-63-120208, there is no clear solution from the point of view of the above-mentioned edge plate thickness pass/fail judgment. It hadn't been thought of.

・In addition, for continuous measurement of plate thickness near the edge, as described in Japanese Patent Publication No. 63-14884, a point that is a short distance inside from the edge of the steel plate is measured using a one-point thickness meter (with parent and child trolley). A method of tracking measurement using an edge position detector has been considered, but this method has the problem that it is not possible to truly measure the thickness guarantee point determined from the ordered sheet width dimension by correcting for sheet width shifts, etc. there were.

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a steel plate edge thickness measuring device that can accurately and reliably perform edge plate thickness pass/fail determination in real time.

[A Thousand Steps to Solve the Problems] The present invention has been made to advantageously solve these problems, and the gist thereof is (1) The present invention is arranged in a steel plate rolling line in the width direction of the steel plate. A U-shaped movable frame that surrounds the front and back surfaces of the edge portion from the edge side and is movable in the width direction of the steel sheet, and a multimeter that measures the sheet thickness at multiple points in the width direction of the steel sheet at the edge portion in the width direction of the steel sheet, which are placed on each of the movable frames. a point plate thickness detector, a position detection device connected to the driving means of the moving frame to detect the position of the multi-point plate thickness detector of the moving frame, and a steel plate edge position detected by the multi-point plate thickness detector; , Continuously calculates the width of the steel plate from the position of the multi-point thickness detector of the movable frame detected by the position detection device from the steel plate rolling line center, and also calculates the thickness guarantee in the width direction of the steel plate from the host computer. A steel plate edge thickness measurement comprising a calculation device that inputs position information, corrects the thermal expansion of the plate width, and calculates the plate thickness measurement position from the steel plate edge, and continuously measures the plate thickness at the calculated position. Device.

(2) A U-shaped moving frame that is placed in the steel plate rolling line and surrounds the front and back surfaces of the edge portion from the edge side in the width direction of the steel plate and is movable in the width direction of the steel plate; A multi-point plate thickness detector measures the plate thickness at multiple points in the plate width direction, and the steel plate edge position detected by the multi-point plate thickness detector was actually measured using a plate width detector installed in the rolling line. It consists of a calculation device that inputs the sheet width value and the sheet thickness guarantee position information in the steel sheet width direction from the host computer, corrects the thermal expansion of the sheet width, and calculates the sheet thickness measurement position from the steel sheet edge, and calculates the sheet thickness at the calculation position. A steel plate edge thickness measuring device characterized by continuously measuring the thickness of a steel plate.

It is in.

[Function] In general, for hot coils supplied to customers as hot-rolled and for hot coils for subsequent process steel pipes, the upper and lower limits of sheet thickness tolerance and the product width size are adjusted according to the application, as shown in Figure 4. The position Wy in the width direction that guarantees the upper and lower limits of the plate thickness tolerance is determined, and it is necessary to manage this at the hot finish rolling stage. However, in finish rolling, HOT bill width W, trim allowance Wt change in stage, HOT width fluctuation W0
etc., it becomes necessary to define the plate thickness guarantee point Wy from the plate center Wc on the exit side of the finishing rolling machine.

In other words, in plate thickness measurement using an edge plate thickness measuring device, from the point of view of edge plate thickness management, continuous plate thickness measurement at the width direction plate thickness guarantee point W requires the actual plate width and edge position recognition, and approximately 100 mm from the plate edge. It is necessary to measure the full length plate thickness in the width direction inward by mm.

The present invention makes it possible to measure the plate thickness guarantee point W in real time in accordance with the above-mentioned requirements.

[Example] (Example 1) Fig. 1 is an explanatory diagram showing the device configuration of the first invention of the present application, and la
, lb are U-shaped moving frames arranged on the work side WS and drive side DS, respectively, and are movable in the width direction of the hot coil S by wheels 4a and 4b.

2a and 2b are arcuate radiation beams, and 3a and 3b are arcuate multi-point plate thickness detectors that detect the plate thickness by receiving the arcuate radiation beams 2a and 2b, and are respectively arranged on a U-shaped moving frame lajb. It consists of 160 detection sensors arranged in parallel at a 5 mm pitch.

Reference numerals 5a and 5b detect the positions of the U-shaped moving frames la and lb using position detection devices attached to wheels 4a and 4b, which are drive means. 6 is a calculation device, and position detection devices 5a, 5
The board width W is determined based on the position information of the U-shaped moving frames la and lb from b and the edge position information obtained by the arcuate multi-point board thickness detectors 3a and 3b. At the same time, the measurement position from the edge is calculated based on the plate thickness guaranteed position information from the host computer 7.

The calculation is performed in the following manner. Here, FIG. 3 shows a partial diagram of the apparatus shown in FIG. 1, where S is a hot slip, Mc is a mill center, and the plate width Wo can be determined from the following formula.

wo = l, w + l. , D+Δb+Δft.

(' means that it includes hot expansion) w: Distance from the mill center Mc to the center of the arcuate multi-point plate thickness detector 3a, which is not shown. This is the absolute position measured by a position detector.

Lo=distance from the mill center Mc to the center of the arcuate multi-point plate thickness detector 3b (not shown), which is the absolute position measured by the position detector (not shown).

A II. w, Δlo: Distance from the center of the arcuate multipoint plate thickness detectors 3a and 3b to the edge detection sensor, respectively.

Needless to say, in the case of one-point generation multi-point light reception as shown in the figure, the geometric positional deviation caused by the distance difference between the steel plate bus line and the light receiving section is corrected.

On the other hand, the calculation device 6 is instructed by the E-position calculator 7 to determine the board thickness guaranteed position Wy from the board center Wc. Then, based on this instruction value and the calculated plate width W0', thermal expansion correction is performed to calculate the measurement position from the edge in the width direction. Measurement position A
', then A' = W0'/2-W, X (1 + d) d: A' is determined as the thermal expansion correction coefficient.

Once the measurement point A is determined, the U-shaped moving frame 1a
Among the arc-shaped multi-point plate thickness detectors 3a (160 channels) placed in the arc-shaped multi-point plate thickness detector 3a (160 channels), the channel that is A inward from the edge recognition channel CE is positioned as the plate thickness management channel CK, and the plate thickness at that point is continuously output. .

These calculations, for example, can be performed on the order of 0.2 seconds, including measurement sampling, using a minicomputer level calculator, and can be considered as continuous measurement in practice. Furthermore, according to the above method, even if the plate center Wc deviates from the mill center Mc due to bending or runout of the plate, or if there is a change in the width of the plate, the correction can be made within the range of the multi-point thickness gauge array. There is no need to move the shape moving frame, and the edge recognition channel C,:, plate thickness management channel CK can be used accordingly.
It is possible to continuously measure the plate thickness guarantee point by simply changing it each time.

(Embodiment 2) FIG. 2 shows the structure of a device according to the second invention of the present application, and for convenience, only one side of the U-shaped moving frame is shown. Reference numeral 8 in the figure indicates a strip width detector that is normally installed on the exit side of a finishing rolling mill. In this example, since the sheet width value W0 is obtained by directly measuring the sheet width value W0 with the sheet width detector 8, there is no need for sheet width calculation by the arithmetic unit 6 as in the first embodiment. However, if the installation position of the board width detector 8 and the installation position of the U-shaped moving frame are not close to each other, distance correction is required.

Therefore, in the case of this example, the edge position information from the arcuate multi-point plate thickness detector 3b is used in the arithmetic unit 6 and the upper computer 7
The measurement point A from the plate edge is calculated in the same manner as in the first embodiment based on the plate thickness guaranteed position information from the plate edge.

The continuous measurement values of the plate thickness guarantee points obtained in Examples 1 and 2 are given to an indicator, recorded on a chart, and accumulated in a host computer. Based on this result, operator actions and abnormal material recognition input (or automatic judgment) can be directly performed. Continuous data can also be streamed as online information to perform automatic thickness control (e.g. rolling down, leveling, bending, etc.). It is possible.

[Effects of the invention] As described above, the present invention makes it possible to directly measure the thickness at the thickness guarantee point on the edge of a steel plate, and solves the problems of the conventional method. Action, automatic thickness control reduces the occurrence of plate thickness defects, and ■ improves the efficiency of final plate thickness guarantee work in the next process based on continuous edge plate thickness measurement results (charts or stacked continuous data).

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the first invention of the present application. FIG. 2 is an explanatory diagram showing an embodiment of the second invention of the present application. FIG. 3 is a partial diagram illustrating a calculation method for plate width calculation and plate thickness guarantee point. FIG. 4 is an explanatory diagram showing the relationship between the finished exit side plate width and the plate thickness guarantee position. DESCRIPTION OF SYMBOLS 1... U-shaped moving frame, 2... Arc-shaped radiation beam, 3- Arc-shaped multi-point plate thickness detector, 4... Drive wheel, 5
...Position detector, 6...Arithmetic unit, 7...Upper computer, S...Hot strip.

Claims (1)

[Scope of Claims] 1. A U-shaped moving frame that is disposed in a steel plate rolling line and surrounds the front and back surfaces of the edge portion from the edge side in the width direction of the steel plate and is movable in the width direction of the steel plate, and is disposed on each of the moving frames. a multi-point plate thickness detector that measures the plate thickness at multiple points in the width direction of the steel plate at the edge portion in the width direction of the steel plate; and a position where the multi-point plate thickness detector of the movable frame connected to the driving means of the moving frame performs position detection. The plate edge position of the steel plate detected by the detection device, the multi-point plate thickness detector, and the position of the moving frame from the steel plate rolling line center of the multi-point plate thickness detector detected by the position detection device. It consists of a calculation device that continuously calculates the width, inputs the sheet thickness guarantee position information in the steel sheet width direction from the host computer, corrects the thermal expansion of the sheet width, and calculates the sheet thickness measurement position from the steel sheet edge. A steel plate edge thickness measuring device characterized by continuous measurement of plate thickness at certain positions. 2. A U-shaped moving frame that is placed in the steel plate rolling line and surrounds the front and back surfaces of the edge portion from the edge side in the width direction of the steel plate and is movable in the width direction of the steel plate, and a steel plate width direction edge portion that is placed on each of the moving frames. A multi-point plate thickness detector measures the plate thickness at multiple points in the plate width direction, and the steel plate edge position detected by the multi-point plate thickness detector and the plate actually measured by the plate width detector installed in the rolling line. It consists of a calculation device that inputs the width value and the sheet thickness guarantee position information in the steel plate width direction from the host computer, corrects the thermal expansion of the sheet width, and calculates the sheet thickness measurement position from the steel sheet edge. A steel plate edge thickness measuring device characterized by continuous measurement.