JPS60253865A - Processing method of ultrasonic flaw detection data - Google Patents

Abstract

PURPOSE:To facilitate the detection of flaws as specified by inspection standard by a method wherein flaw information is picked up by scanning over the surface of steel material to be digitized and after a signal processing, it is outputted as secondary information to extract flaws alone on specified scan lines. CONSTITUTION:Probes 2A-2D are arranged over a steel plate 1 at an equispace and a scanned at right angles to the rolling direction thereof to detect flaws and reflected waves from the steel plate 1 are received by the probes 2A-2D individually to be inputted into a quantization device 6 with transmitting/receiving cables 4A-4D through a flaw detector 3. Then, the quantization device 6 divides flaw information of the steel plate 1 into four stages in terms of the degree of flaws and sends digitized information sequentially to a signal processor 7, with which flaw information is ranked in the form of a mesh throughout the steel plate 1 together with a counter system 8 to discriminate flaws on the dara mesh covering a specified scan line based on the inspection standard. Thus, the evaluation of the steel plate 1 can be done accurately on the basis of the standard.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an ultrasonic automatic flaw detection device that automatically scans the surface of a steel plate with a probe, in which signal processing of flaw information on the surface of the steel plate is performed using a computer. The present invention relates to a method for performing high precision using a system.

[Prior art]

Conventionally, in the ultrasonic flaw detection of steel sheets using automatic ultrasonic flaw detection equipment, there are two methods: an X-scan method in which the probe is scanned parallel to the rolling direction of the steel sheet, and an X-scan method in which the probe is scanned perpendicular to the rolling direction of the steel sheet. Two methods are known: a scanning method and a scanning method.

FIG. 1 is a block diagram showing a system of a conventional ultrasonic automatic flaw detection device using the X-scanning method. In the figure, reference numeral 1 denotes a steel plate that constitutes the material to be inspected. This steel plate 1 is controlled to be conveyed and stopped in the direction of the arrow in FIG. 1 by a conveyance control mechanism (not shown). Reference numerals 2A to 2D are ultrasonic probes, and each of the four probes 2A to 2D is arranged at equal intervals in the rolling direction of the steel plate 1, and is controlled by a probe tracking mechanism (not shown) on the surface of the steel plate 10. is scanned perpendicular to the rolling direction. Here, the number of each probe 28 to 2D is explained as 4, but if some probes are configured as blocks or the number of probes is increased, flaw detection is possible. It has the characteristics of improving efficiency, detection, and wound coverage.

3 is a flaw detection device, and this flaw detection device 3 is used for each probe 2A.
~2D controls the ultrasonic signal transmitted to the steel plate 1, and each probe 2A~2D collects information on flaws that are internal flaws in the steel plate 1 and have the highest wave height from among the reflected waves received from the steel plate 1. This is to sample and extract. 4A-4D
is a transmitting/receiving cable, and each transmitting/receiving cable 4A~
4D is for transmitting and receiving the above-mentioned signals between each of the probes 2A to 2D and the flaw detection device 3. This recording device 5 records the flaw information extracted by the flaw detection device 3 while changing the recording speed according to the scanning speed of each probe 2A to 2.
This is recorded for each D.

Next, the operation of the automatic ultrasonic flaw detection apparatus shown in FIG. 1 will be explained. A steel plate 1 is fed into an automatic ultrasonic flaw detector as shown in FIG. 1, and the steel plate 1 is stopped by a detection signal from the top end T of the steel plate 1. Each probe 2A to 2D is a steel plate 1
It moves to the edge side of the steel plate 1 until it comes into contact with the surface of the steel plate 1 through a water film and detects the top edge T and edge edge S of the steel plate 1. Thereafter, each of the probes 2A to 2D scans perpendicularly to the rolling direction toward the edge end N of the steel plate 1, that is, performs an X scan, and moves to the edge end N to complete the first flaw detection.

Next, each of the probes 2A to 2D is shifted toward the bottom end B side of the steel plate 1 by one probe in the rolling direction, and the edge end N
X-scanning flaw detection is performed to the edge end S, and the second flaw detection is completed. When the flaw detection for one round trip is completed, the inspected part is transported, and the adjacent part is inspected for the second round trip.

These flaw detection operations are repeated nine times until reaching the bottom end B of the copper plate 1. In addition, at the same time as these flaw detection operations, the flaw detection device 3
extracts flaw information on the copper plate 1 while generating ultrasonic signals in each of the probes 2A to 2D, and outputs the magnitude of the reflected wave of this flaw information to the recording device 5 as analog information. The recording device 5 is composed of, for example, a pen recorder, and each probe 2A to
21) The recording speed is changed according to the scanning speed, and recording is performed for each probe 2A to 2D.

FIGS. 2(a) and 2(b) are diagrams showing output waveforms of a probe scanning surface and flaws on a steel plate, respectively, in the automatic ultrasonic flaw detection apparatus of FIG. 1. In each figure, IA to IH are the probe scanning surfaces on the steel plate 1, and among these, each probe scanning surface IA to ID is the edge edge S of each probe 2A to 2D, respectively. Corresponding to the X scan toward the edge N, each probe scanning plane IE to IH corresponds to the X scan from the edge edge N to the edge edge S of each probe 2A to 2D, respectively. 2X to 2z are scratches on the steel plate 1, and the outputs from the recording device 5 when these six scratches 2X to 2Z are detected are shown by 3'A to 3D, and each of the outputs 3A to 3D corresponds to each probe. It corresponds to 2A to 2D output. Reference numeral 5a indicates a sheet of paper from the recording device 5, and this sheet 5a is fed in the direction of the arrow in FIG. 2(b). Recording device 5
The correspondence between each of the output waveforms 61A to 66D of the outputs 38 to 3D from `` and the scratches 2X to 2z is shown in the following diagram.

Output waveforms 61A, 62A, 63B are scratches 2X output waveform 64B, '65B are scratches 2Y output waveform 66D
The device that moves the scratches 2z 2A to 2D in the X direction or Y' force direction of the steel plate 1 records scratches in the scanning direction of the X direction or the Y direction. 75i, steel plate 1 inspection standard (JI'
5-G-osot, 09'61, etc.), it is difficult to judge whether or not this flaw is on a specific scan line. □ [Summary of the invention] ゛The purpose of this invention is to improve the above-mentioned drawbacks of the conventional device. This method extracts only the flaws on specific scanning lines specified in the inspection standards for steel plates, processes the data, and uses this to determine pass/fail for the steel plate. As a result, regarding the through-hole scratches specified in the steel plate inspection standards,
Embodiments of the Invention Embodiments of the invention will be described below with reference to the drawings.

FIG. 3 is a configuration diagram showing a system of an automatic ultrasonic flaw detection device in an ultrasonic flaw detection data processing method that is an embodiment of the present invention, and the same parts as in FIG. 1 are indicated using the same symbols. However, detailed explanation thereof will be omitted. In the figure, 6
is a quantizer and 6. ? , this quantization device 6 classifies the flaw information of the highest wave height value of the flaws on the steel plate 1 sent from the flaw detection device 3 into four levels as shown in the table below and expresses them in code information. , which digitizes and outputs flaw information in unit categories.

7 is a signal processing device, and this signal processing device 7 sequentially inputs and holds the digitized flaw information of the unit division in the X scanning direction of the steel plate 1 that is sequentially output from the quantizer 6, and The flaw information from a predetermined number of unit categories, for example 25, is added for each flaw level, and the highest flaw level and the number of flawed unit categories are encoded into eight pieces of information and output. be. Reference numeral 8 denotes a computer system, and this computer system 8 has a memory that can hold information on flaws generated in the signal processing device 7 for one steel plate 1, and judges the length and position of flaws existing in the steel plate 1. , has the function of making a pass/fail judgment for the steel plate 1.

Next, the operation of the automatic ultrasonic flaw detection apparatus shown in FIG. 3 will be explained. The flaw detection operation of the apparatus shown in FIG. 3 is the same as that of the above-mentioned conventional example, and the signal processing up to the flaw detection apparatus 3 is also the same as that of the above-mentioned conventional example. Let's talk about processing. Flaw detection device 3
The flaw analog signal of the steel plate 1 outputted by the quantizer 6 is input to the quantization device 6, where it is digitized by the flaw level for each unit division, and is sequentially output to the signal processing device 7. The signal processing device 7 adds a predetermined number of digitized flaw information to a signal holding register (not shown) of only 25 unit divisions for each level, and calculates the highest flaw level in the 25 unit divisions. The number of unit sections with scratches is output to the computer system 8.

The computer system 8 first stores the flaw information organized into 25 units into a predetermined area of the computer memory (not shown) as a data processing mesh, which will be described later, in consideration of its positioning in the entire steel plate 1. Next, the stored flaw information of each of the probes 28 to 2D is transferred to the actual steel plate image on the computer memory, taking into account the flaw detection direction and flaw detection position.
Expand into dimensions. After performing this process for 101 steel plates, flaws on the data processing mesh on a specific scanning line predetermined according to the inspection standard for the steel plate I are selected.

The flaws selected here are considered to be flaws that must be evaluated according to the above-mentioned inspection standards, and are subsequently subjected to flaw evaluation and pass/fail determination processing.

On the contrary, flaws that are not on the data processing mesh on the specific scanning line may be evaluated based on separate criteria, or may be excluded from the evaluation as the case may be.

FIG. 4 is a diagram illustrating how flaws are selected in the automatic ultrasonic flaw detection apparatus of FIG. 3 to distinguish between flaws that occur on a specific scanning line of a steel plate and flaws that do not occur. In the figure, 8A is a reference line in the X direction, 8B is a reference line in the Y direction, and the area surrounded by each of the reference lines 8A and 8B is a data processing mesh 8CTβ.

This is a data processing mesh 1j in the X direction that includes specific scanning lines 8Dti specified by the inspection standard at constant intervals in the X direction, and 8EFi specific scanning lines 8D. 8F to 8H are flaws on steel plate 1, and only when the individual flaws in each even 8F to 8H overlap with data processing mesh row 8E, it is determined that the flaws are ranked first according to the inspection standards. . As shown in Figure 4, scratch 8
F and scratch 8G are scratches on specific scanning line 8D, and scratch 8
H is a scratch that does not overlap the specific scanning line 8D.

In addition, in the above embodiment, a case was explained in which the automatic ultrasonic flaw detection apparatus for steel plate 1 was used, but the invention is not limited to this automatic ultrasonic flaw detection apparatus, and it can also be applied to those using X-rays or laser beams, and to the automatic ultrasonic flaw detection apparatus for steel plate 1. This method can also be applied to non-destructive inspections of other plate-shaped objects and data processing.

In addition, in the above embodiment, among the flaws on the steel plate 1, a two-dimensional image of the steel plate is used to visually express the flaws that fall on the specific scanning line specified in the inspection standard and those that do not fall on the specific scanning line. , each unit part, the position of the wound, and the total length C
It is possible to output on an RT display device or on printing paper.

〔Effect of the invention〕

As explained above, in the ultrasonic flaw detection data processing method, this invention extracts only flaws on a specific scanning line specified in the inspection standards for steel plates and processes the data, thereby determining whether the steel plate passes or fails. Since the judgment is made, it is possible to carry out the inspection extremely easily and accurately for the nine flaws specified in the steel plate inspection standards. This method has excellent effects such as being able to accurately evaluate 1-1 judgment even for internal quality defects.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the system of a conventional automatic ultrasonic flaw detection system using the X-scanning method. FIG. 3 is a diagram showing the output waveform of the probe scanning surface and flaws, and FIG. 3 is a configuration diagram showing the system of an automatic ultrasonic flaw detection device in an ultrasonic flaw detection data processing method that is an embodiment of the present invention. FIG. 4 is a diagram showing a flaw selection mode for classifying flaws on a specific scanning line of a steel plate and flaws that do not occur in the automatic ultrasonic flaw detection apparatus shown in FIG. 3. In the figure, 1... Steel plate, IA-IH... Probe scanning surface, 2A-2D... Probe, 2X-2Z, 8F-
8H...Flaw, 3...Flaw detection device, 3A-3D...Output, 4A-4D...Transmission/reception cable, 5...Recording device, 5a...Paper, 6...Quantization device ,7...
Signal processing device, 8... Computer system, 8A, 8B.
...Reference line, 8C...Data processing mesh, 8D...
・Specific scanning line, 8E...Data processing mesh column, 61
A, "62A, 63B, 64B. 65B, 66D...Output waveform, T...Top end, B...Bottom end, S, N...Edge end. In each figure, the same Reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 (a) Also Figure 3

Claims (1)

[Claims] Using an ultrasonic automatic flaw detection device, a probe is scanned over the surface of the steel plate to extract flaw information regarding unit parts of the steel plate, and this flaw information is digitized by a quantization device as primary information. This primary information is sequentially input and held in a signal processing device, and after signal processing is performed on a predetermined number of the primary information as a unit, the secondary information is output as secondary information. The system stores each steel plate and develops it two-dimensionally, distinguishing between scratches that are on a specific scanning line of the steel plate and scratches that are not.
An ultrasonic flaw detection data processing method characterized in that a pass/fail determination of the steel plate is made based on the evaluation reference pressure of each flaw.