JPS6330757A - Ultrasonic flaw detection test - Google Patents

Abstract

PURPOSE:To simultaneously perform the detection of a flaw part and the location of the position thereof, by fixing either one of an ultrasonic probe and a body to be inspected to a coordinates measuring apparatus and moving the other one with respect to said coordinates measuring apparatus and detecting the flaw of the body to be inspected by the ultrasonic probe. CONSTITUTION:Either one of an ultrasonic probe and a body to be inspected is fixed to a coordinates measuring apparatus and the other one is fixed on a moving side with respect to the coordinates measuring apparatus and the ultrasonic probe is contacted with the body to be inspected to be relatively moved to perform flaw detection. As the coordinates measuring apparatus, an apparatus for electrically outputting coordinates of a moving body moving along machine axes consisting of an X-axis, a Y-axis and a Z-axis is used. For example, the ultrasonic probe is mounted to the three-dimensional coordinates measuring apparatus to perform the flaw detection of plate-shaped silicon nitride and coordinates data are detected and plotted to accurately display the position of the flaw part with respect to a reference point. Since either one of the ultrasonic probe and the body to be detection of the flaw and the location of the position thereof can be accurately performed.

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to an ultrasonic flaw detection test method, and in particular, it makes it possible to detect a defective part and evaluate its position at the same time, and also to ensure that flaw detection is performed evenly and reliably. Regarding the ultrasonic flaw detection testing method.

(Prior Art) Ultrasonic testing has conventionally been used as a method for detecting internal defects such as bores and foreign objects in ceramic sintered bodies.

In this method, the ultrasonic probe (transducer) of an ultrasonic flaw detection device is moved while in contact with the surface of the ceramic sintered body, and the presence and size of the defect is detected using a repulsive wave that comes from the defective part. It is a method of detection, and its position is evaluated using a scale.

(Problems to be Solved by the Invention) However, in such conventional methods, the position of the defective part is evaluated using a scale, which requires time and effort for testing, and it is not possible to accurately evaluate the position of the defective part. This problem happened very often.

Furthermore, since the ultrasonic probe is operated manually, there is a problem in that it is difficult to detect flaws evenly and reliably on the surface of the object.

The present invention has been made in order to solve these conventional difficulties, and is an ultrasonic flaw detection method that makes it possible to detect defects and evaluate their positions at the same time, and also makes it possible to perform flaw detection evenly. The purpose is to provide test methods.

[Structure of the Invention] (Means for Solving the Problems) The ultrasonic flaw detection testing method of the present invention moves an ultrasonic probe of an ultrasonic flaw detection device along the surface of a test object, In the method for detecting defects, one of the ultrasonic probe and the object of the ultrasonic flaw detection device is fixed to the coordinate measuring device, the other is fixed to the moving side of the coordinate measuring device, and the A feature of this method is that the ultrasonic probe of the ultrasonic flaw detection device is brought into contact with the object and moved relative to the object to detect the defect and evaluate its position at the same time.

The coordinate measuring device used in the present invention is, for example, an X-axis and a Y-axis.
A two-dimensional or three-dimensional coordinate measuring device that has mechanical axes consisting of an axis or an Are suitable. Note that in the present invention, the object to be examined is fixed to the coordinate measuring device and the ultrasonic probe of the ultrasonic flaw detection device is moved; however, conversely, the ultrasonic probe of the ultrasonic flaw detecting device is It may be fixed to the apparatus and moved on the subject side.

Note that it is convenient to store the position data of the defective portion in a storage device such as a floppy disk for storage and reproduction of the defective portion using a plotter.

(Function) In the present invention, when performing an ultrasonic flaw detection test on a test object, the ultrasonic probe of the ultrasonic flaw detection device and the test object are relatively moved by the coordinate measuring device, and the ultrasonic probe detects the defective part. When detected, the position on the coordinates can be detected at the same time.

Therefore, there is no need to separately evaluate the position of the defect. Further, since the coordinate measuring device can scan the object with an ultrasonic probe, the surface of the object can be detected evenly and reliably at a finer scanning pitch.

(Example) Examples of the present invention will be described below.

Example Silicon nitride powder: ioo parts by weight A mixed powder consisting of 5 parts by weight of ittria powder and 2 parts by weight of alumina powder was pressure sintered at 1800'C for 3 hours at a pressure of 40MPa to form a 140mm x 140mm powder.
A flat silicon nitride sintered body with a HX of 15 mm was manufactured.

Next, the surface of this silicon nitride sintered body was scanned at a pitch of 0.1 mm using an ultrasonic probe attached to a three-dimensional coordinate measuring device whose sensitivity had been calibrated in advance, and the detected coordinate data was recorded. Save it to a storage device (floppy disk).

FIG. 1 shows the output of this coordinate data, and FIG. 2 shows the position of the defective part plotted based on this coordinate data. In the figure, * indicates the position of the defective part, and O indicates the hole provided at the reference point.

From these figures, it can be seen that the position of the defective part is accurately recorded.

Note that the sensitivity calibration is performed using, for example, a diameter of 0.2 to 0.02 mv.
This is done using a ceramic sintered body in which multiple tungsten wires are embedded at equal intervals.

[Effect of the invention] As is clear from the above examples, according to the present invention,
Defect detection and position evaluation can be performed at the same time, and the labor involved in ultrasonic flaw detection testing can be significantly reduced. Furthermore, as shown in the example, if the coordinate position data is stored in a storage device, the position and size of the defect can be visually reproduced by plotting it on a plane. It can be effectively used to clarify the cause and take countermeasures.

[Brief explanation of drawings]

FIG. 1 is a table showing coordinate position data of defective parts obtained according to the present invention, and FIG. 2 is a diagram plotting this coordinate data. O・・・・・・・・・Reference point 6゜ir 4 Hakama 4 # Masu # Gumi # p Attack # # “4 Masu J Masu 2 Fig. 2 6゜ Jin = 4 1X Don joint Joint # 4 Masune

Claims (3)

[Claims] (1) In a method of detecting defects in a test object by moving an ultrasonic probe of the ultrasonic test device along the surface of the test object, the ultrasonic probe of the ultrasonic test device and the Either one is fixed to the coordinate measuring device and the other is fixed to the moving side of the coordinate measuring device, and the ultrasonic probe of the ultrasonic flaw detection device is moved relative to the object while being in contact with the object to detect defects. An ultrasonic flaw detection testing method characterized by detecting parts and evaluating their positions. (2) The ultrasonic flaw detection testing method according to claim 1, wherein the test object is a ceramic sintered body. (3) The ultrasonic flaw detection method according to claim 1 or 2, wherein the evaluated position data of the defective portion is stored in a storage device.