JPS60102554A - Ultrasonic probe - Google Patents

Abstract

PURPOSE:To detect the flaw in columnar matter from the outer surface thereof with high sensitivity, by contacting a film like probe with the columnar matter having a curved surface and processed into a stepped form so as to follow the surface of said matter. CONSTITUTION:A film like probe 1 is attached to the bottom surface of a probe case A and a flexible backing material 2 is bonded to the back surface thereof to attach a cable 3. The surface, which is contacted with the surface of columnar matter B, of the side plate of the probe case A is processed so as to have radius of curvature same to that of the surface of the columnar matter B. The probe case A is contacted with the surface of the columnar matter B and an ultrasonic wave is emitted so as to allow the film like probe 1 to follow the surface of the columnar matter B by a press screw 6 and a contact plate 7. At this time, the flexible backing material 3 attenuates energy propagating behind the film like probe 1. Therefore, by preparing only one probe and the probe case having specific radius of curvature, the vicinity of an axial core can be subjected to flaw detection even with respect to an object to be inspected having a stepped curved surface such as a turbine shaft with high sensitivity and high resolving power.

Description

[Detailed description of the invention] [Utilization of the invention! ! f) The present invention provides an ultrasonic probe that is suitable for detecting defects that occur near the axis of a cylindrical object.

For this reason, each Yuzu roll of rolling mills, etc., each Yuzu axle of Toyoko, etc.
Various types of shafts such as steam terpinoes and steam turbines, screw shafts of ships, etc., and pressure distribution of chemical granodes, etc. [-1] Other shafts for rotation transmission, various cylindrical materials, etc. It can be used to detect defects, etc. that occur.

In recent years, with the support of advances in the field of ultrasonic flaw detection (VC2), the detection ability and resolution of ultrasonic flaw detection has improved, supported by advances in ultra-single-wave ψ separation technology, advances in processing technology, and advances in electronics technology. Now, it has become possible to perform flaw detection by focusing or scanning ultrasonic beams using concave transducers, laser beams, array type transducers, etc.

However, although these methods are possible in relatively shallow areas where the surface of the subject is flat, it has been considered difficult to do so in deep areas where the surface of the subject is curved.

In particular, when the outer diameter of a turpino shaft is processed in a stepwise manner, and the curvature of each flaw detection surface changes, and the flaw detection distance varies from several tens to several hundreds of rnrn, the curvature of each outer surface changes. A matching probe was required.

[Purpose of the invention]

The purpose of the present J is to eliminate the above-mentioned drawbacks, and to use a superstructure for cylindrical objects that is suitable for flaw detection from the outer surface of cylindrical objects that have been processed in one step, especially when the surface of the object is curved. K provides sonic probes.

[Overview of the Invention] The present invention is based on an ultrasonic probe with a film-backed transducer.
Even if the curvature of the object surface changes, it can be closely contacted, and the ultrasonic wave is injected in the normal direction of the surface, and the ultrasonic beam is fully focused around the 11111 center of the cylindrical object, improving defect detection ability and azimuth resolution. etc.

[Embodiments of the invention]

Examples of the present invention are shown in FIGS. 1 to 3.

1 is a film oscillator, 2 is a flexible oscillator, and 3 is a couple. The camera head of the film and the central material are acoustically coupled, and the energy propagating to the rear of the film is scattered, attenuated, and returned to the oscillator. Never. The energy transmitted to the front of the film is transmitted into the object, reflected by defects, etc., and transmitted to the transducer again. It is embedded in the batter.Backing material 2-4
This part is for the oscillator bending of the film...It is not possible to receive a separate vehicle when trying to imitate the iK.

FIG. 2 is an example of a probe case when the probe shown in FIG. 1 is used for a subject having a fully curved surface. 5 is the side plate, both t (the side plate of 11 is integrally exploded.
The surface of one plate that comes into contact with the subject is processed so that the curvature of the outer surface of the subject is upward. Therefore, if the curvatures are unique, it is necessary to prepare 1111 plates for each radius of curvature r of the surface to be examined. No. 6 is used for pressing the vibrator surface into a curved surface.

7 is a guard plate, which is used to prevent damage caused by long-shot screws.

FIG. 3 shows the entire state in which the probe shown in FIG. 1 and the probe case shown in FIG. 2 are combined.

〔Effect of the invention〕

According to the present invention, the ll1it1 probe can be used to deal with objects having a stepwise curved surface such as a turbine shaft. Therefore, by simply preparing a probe of 1 tffi and a probe with a curvature of Tanyuzu, there will be an electric shock near the axis, and the high-minute H←-power probe will become oJ-power.
Large industrial profits can be expected.

[Brief explanation of the drawing]

Figure 1 shows the shape of an ultrasonic probe consisting of the film transducer of the present invention and a T=J spigot, and Figure 2 shows a probe for four channels on each curved surface. Child case 174'h
k, Figure 43 shows the probe in Figure 1 and probe 1qi in Figure 2 (
This is a prone figure with a combination of child cases. 1...Film-backed oscillator, 2...Note number J'J#. Rod 1 diagram

Claims (1)

[Claims] 1. In an ultrasonic probe that transmits and receives ultrasonic waves and detects defects in objects, the transmitting and receiving part is equipped with a film covered with #.
An ultrasonic probe characterized in that the thin film is made to follow the outer surface of a cylindrical object using a cylindrical object.