JPH08278291A - Inspection method and device for adhesion part - Google Patents

Abstract

PURPOSE: To positively inspect the adhesive status of an adhesion part even if an adhesive with a small acoustic impedance as compared with an adherened is used. CONSTITUTION: An item 10 to be inspected is placed on a table 40 which is constituted so that it can be rotated horizontally and moved up and down by a driving means. A probe 22 for sending a signal of an ultrasonic flaw defecting device 11 is placed so that it constantly contacts the outer-periphery surface of a first adherend 12 located outside. The probe 22 for sending a signal is connected to a flaw detector 24 and is set so that a ultrasonic wave with a required level is oscillated. A probe 26 for receiving a signal connected to the flaw detector 24 is placed so that it constantly contacts the axial end face of a second adherend 14 located inside the item 10 to be inspected. The probe 26 for receiving a signal functions so that an ultrasonic wave which is applied to the first adherend 12 from the probe 22 for sending a signal is transmitted through the first adherend 12 and an adhesive 16 and the transmission signal obtained by multiple reflection in the second adherend 14 can be received.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to inspect the bonding state of the bonded portions of two bonded members bonded by using an adhesive having a smaller acoustic impedance than the bonded members using ultrasonic waves. The present invention relates to a method and an apparatus for inspecting a bonded portion.

[0002]

2. Description of the Related Art Generally, members to be adhered such as metal are adhered to each other using a rubber-based or resin-based adhesive such as acrylic or epoxy. For example, in a rotor for a rotating electric machine, an adhesive is applied to the inside of a through hole of a cylindrical magnet and the outside of a rotor rotation shaft with a required thickness, and the rotor rotation shaft is inserted into the through hole to bond the two. It is configured by adhesively fixing via a chemical.

Defects such as unbonded parts and holes may occur inside the bonded part in the product bonded with the above-mentioned adhesive during the bonding process. In this way, it is not possible to confirm from the outside whether or not there is a defect that occurs inside the bonded portion, and when a product containing the above-mentioned defect is shipped toward the next step, etc., This causes deterioration of the structural strength and deterioration of quality. Therefore, prior to shipping, it is necessary to inspect the product for internal defects in advance.

[0004]

Here, an ultrasonic flaw detection method is known as a means for inspecting an internal defect that cannot be visually recognized from the outside. As this ultrasonic flaw detection method, a reflection method is generally used in which an ultrasonic wave is incident perpendicularly to the bonded portion and a reflected wave from the defective portion is detected to inspect for the presence or absence of the defect. However, since the adhesive made of the above-mentioned material has an extremely small acoustic impedance as compared with the adherend member, it has been impossible to detect the presence or absence of a defect by detecting the reflected wave from the defective portion in the adhesive portion. That is, when an ultrasonic wave is incident from the outside adhered member toward the adhesive portion, first, most of the ultrasonic wave is reflected at the boundary between the adhered member and the adhesive, and a slight ultrasonic wave is incident on the adhesive portion. If there is an internal defect in the bonded part, the ultrasonic wave is reflected by the defect, but most of the reflected wave is reflected again at the boundary between the adhesive and the member to be bonded. It was impossible to detect the reflected wave from the defect.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the problems inherent in the above-described inspection of the bonded portion, and is a solution to this problem. An object of the present invention is to provide an inspection method and an apparatus for an adhesive portion, which can inspect the adhesive state of the adhesive portion even when a chemical is used.

[0006]

[Means for Solving the Problems] In order to overcome the above-mentioned problems and achieve an intended object, a method for inspecting an adhesive portion according to the present invention was obtained by adhering two adherend members with an adhesive. A method of inspecting a bonding state of a bonding portion of an inspected product, wherein ultrasonic waves oscillated from a transmitting probe of an ultrasonic flaw detector are directed from the first bonded member side of the inspected product to the bonding part. The transmitted wave that is incident on the first adhered member and transmitted through the first adhered member and the adhesive and is multiple-reflected in the second adhered member or the transmitted wave that propagates through the surface layer of the second adhered member is transmitted. Of the transmitted wave received by the receiving probe in the ultrasonic flaw detector, which is in contact with the second member to be adhered, at a portion deviated from the incident direction of the ultrasonic wave from the probe, and the transmitted wave received by the receiving probe. Characterized by inspecting the state of the adhesive portion from sound pressure

Further, in order to preferably carry out the above-described method for inspecting an adhesive portion, an inspection device for an adhesive portion according to another invention of the present application adheres a second adhered member to a first adhered member via an adhesive. A device for inspecting a bonding state of a bonding portion in a product to be inspected, which is obtained by: a transmitting probe for injecting an ultrasonic wave from the outside of the first bonded member toward the bonding portion; The second member to be adhered is disposed so as to come into contact with a portion of the second member to be deviated from the incident direction of the ultrasonic wave from the transmitting probe, and the second member to be bonded and the adhesive are transmitted,
A receiving probe that receives a transmitted wave that is multiple-reflected in the adherend member or a transmitted wave that propagates in the surface layer portion of the second adhered member, and a transmitted wave that is received by the receiving probe are input.
It is characterized by comprising an evaluation means for evaluating the state of the adhesive portion from the sound pressure of the transmitted wave.

Further, in order to preferably carry out the above-described method of inspecting an adhesive portion, an adhesive portion inspection apparatus according to another invention of the present application is obtained by adhering a plurality of adhered members to each other via an adhesive. Is a device for inspecting a bonding state of an adhesive portion of the inspected product, which is arranged so as to face the inspected product and which transmits an ultrasonic wave toward the inspected product. And a receiving probe for receiving a transmitted wave transmitted through a plurality of members to be adhered and an adhesive, and a transmitted wave received by the receiving probe are input, and the sound pressure of the transmitted wave is used to detect the adhesive portion. It is characterized by comprising an evaluation means for evaluating the state.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a method for inspecting a bonded portion according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. The inspected product 10 inspected by the inspection method of the present invention is, for example, as shown in FIG. 7, a first adhered member 12 formed in a cylindrical shape, and a through hole 12 a of the first adhered member 12. The second adhered member 14 formed in a cylindrical shape having a diameter slightly smaller than the inner diameter of the first adhered member 1
The second adhesive member 14 is inserted into the two through holes 12a and fixed by the adhesive 16 as an object. The axial lengths of the adherend members 12 and 14 are set to be the same.

[0010]

[First Embodiment] FIG. 1 schematically shows an inspection apparatus according to a preferred first embodiment for carrying out the method for inspecting a bonded portion according to the present invention, which is horizontally rotated by a driving means (not shown). Table 40 configured to move up and down with
In addition, the inspected product 10 having the above-described configuration is placed in a posture in which its axis is vertical. The transmitting probe 22 of the ultrasonic flaw detector 11 is provided on the outer side of the first adhered member 12
The probe 22 for transmission is connected to a flaw detector 24 and is set so as to oscillate an ultrasonic wave of a required level. The ultrasonic wave oscillated from the transmitting probe 22 is set so as to be incident perpendicularly on the bonding portion (the layer of the adhesive 16) between the first adhered member 12 and the second adhered member 14. ing. It should be noted that the focus can be used as the transmitting probe 22 and the beam diameter of the ultrasonic waves at the bonded portion can be narrowed down to improve the resolution.

A receiving probe 2 connected to the flaw detector 24.
6 is arranged so as to always contact the shaft end surface of the inner second adhered member 14 of the inspected product 10. In the receiving probe 26, the ultrasonic waves incident from the transmitting probe 22 toward the first adhered member 12 are transmitted through the first adhered member 12 and the adhesive 16, and the second adhered member 12 is transmitted. Adhesive member 1
It functions to receive the transmitted waves that are multiple-reflected within the unit 4. The transmitted wave received by the reception probe 26 is input to the flaw detector 24. In addition, by horizontally rotating the table 40 and moving it up and down, the inspected article 1
Inspection of all zero cross sections can be performed.

As shown in FIG. 2, the flaw detector 24 includes an amplifier 28 connected to the receiving probe 26, a filter 30 and a rectifier 32. The sound pressure of the transmitted wave rectified by the rectifier 32 is measured by a CRT or the like. Is displayed as a graph (see FIG. 4) on the display 34. The transmitted wave rectified by the rectifier 32 is passed through the gate circuit 36 and the AD converter 38.
Is input to the computer 44, transmitted to the computer 44, internally compared with a normal value according to an algorithm, and the result is output.

[0013]

[Evaluation of bonded part] For example, the bonded member 1
In the case of the inspected product 10 in which steel is used for 2, 14 and a silicon rubber adhesive is used for the adhesive 16, at the boundary between the adhered members 12, 14 and the adhesive 16, as shown in FIG. Has a transmittance of 12.6%, and the adhesive 16 itself has a transmittance of 13.5%. Therefore, when there is no defect such as a non-bonded portion or a cavity in the bonded portion, the ultrasonic waves (transmission transmitted through the first bonded member 12 and the bonded portion are incident from the first bonded member 12 side toward the bonded portion. Sound pressure) is 1 / the sound pressure of the incident wave
It will be about 500. On the other hand, when there is a defect in the bonded portion, the ultrasonic wave is completely reflected by the defect and therefore the second
It does not reach the adhered member 14. That is, the presence / absence of a defect can be inspected depending on whether or not the ultrasonic waves have penetrated to the second adhered member 14.

[0014]

[Operation of the First Embodiment] Next, the inspection method of the present application implemented by the inspection apparatus according to the first embodiment will be described with reference to the flowchart shown in FIG. First adhered member 1
When inspecting the bonded portion of the inspected product 10 in which the second adhesive member 2 and the second adhesive member 14 are adhered by the adhesive 16, the inspected product 10 is positioned and fixed on the table 40. Further, the transmitting probe 22 is set to abut on the outer peripheral surface of the first adhered member 12, and the receiving probe 26 is set to abut on the shaft end of the second adhered member 14.
Then, in this state, the inspection by the ultrasonic flaw detector 11 is performed. That is, as shown in the flow chart of FIG. 12, starting at step 101, the transmitting probe 2
An ultrasonic wave is oscillated from 2 toward the outer peripheral surface of the inspection object 10. The ultrasonic waves incident on the inspected product 10 are
The transmitted wave that has been transmitted through the first adhered member 12 and the adhesive 16 and is multiple-reflected inside the second adhered member 14 is received by the reception probe 26 (step 102). The transmitted wave is displayed on the display 34 after being amplified, noise-removed and rectified by the probe 24.

For example, when there is no defect in the bonded portion, as described above, the first bonded member 12 and the bonded portion are transmitted,
The sound pressure of the transmitted wave, which is about 1/500 of the sound pressure of the incident wave and is attenuated by the multiple reflection, is displayed as shown in the graph of FIG. If there is a defect in the adhesive portion, ultrasonic waves will be reflected by the defect in the adhesive portion, so the receiving probe 26
The transmitted wave is not received in the display, but is displayed as shown in the graph of FIG. Only noise is shown in the graph of FIG.

In step 104, the rectifier 32 is used.
The transmitted wave (received waveform) rectified by is AD-converted by the AD converter 38, and then the transmitted wave is transmitted to the computer 44 in step 105. Then, in step 106, the sound pressure of the transmitted wave is calculated inside the computer 44 to calculate the integrated value. By comparing this with the sound pressure of a normal transmitted wave in step 107, the presence or absence of a defect in the adhesive portion is determined, and the result is output in step 108. In this way, noise can be reduced by comparing the transmitted waves that have been transmitted to the computer 44 using the integrated value. The calculation in step 106 may be omitted, and the sound pressure of the transmitted wave after being transmitted to the computer 44 may be directly compared with the sound pressure of the normal transmitted wave.

[0017]

[Second Embodiment] FIG. 5 schematically shows an inspection apparatus according to a second preferred embodiment for carrying out the method for inspecting an adhesive portion according to the present invention, in which the transmitting probe 22 is used. The receiving probe 26 and the receiving probe 26 are arranged so as to face each other on the incident axis of the ultrasonic wave from the transmitting probe 12 with the inspected article 10 interposed therebetween. That is, the ultrasonic waves incident from the side of the first adhered member 12 have a boundary between the first adhered member 12 and the adhesive 16, an adhesive 16, a boundary between the adhesive 16 and the second adhered member 14, and an adhesive. After passing through the agent 16 and the boundary between the adhesive 16 and the first adhered member 12, the signal is received by the receiving probe 26. The sound pressure of the transmitted wave received by the reception probe 26 is attenuated to about 1 / 220,000 of the sound pressure of the incident wave, but the reception probe 26 can sufficiently receive the sound pressure. It is possible to determine the presence or absence of defects.

Here, in the apparatus shown in the first embodiment, the receiving probe 26 is applied to a portion of the second adhered member 14 which is deviated from the incident direction of the ultrasonic wave from the transmitting probe 12. By arranging so as to be in contact with each other, the first adhered member 12
The ultrasonic waves incident from the side pass through the boundary between the first adhered member 12 and the adhesive 16, the adhesive 16, the boundary between the adhesive 16 and the second adhered member 14, and the second adhered member 14 It is received by the receiving probe 26 after being internally reflected. As a result, the sound pressure of the transmitted wave that enters the second adhered member 14 is about 1/500 of the sound pressure of the incident wave as described above, and therefore, when the adhesive 16 that greatly attenuates the ultrasonic waves is used. However, the transmitted wave can be detected when the sound pressure of the transmitted wave is high, which is advantageous over the device of the second embodiment.

[0019]

[Third Embodiment] FIG. 6 schematically shows an inspection apparatus according to a preferred third embodiment for carrying out the method for inspecting a bonded portion according to the present invention. Liquid 20 such as water or oil as a transmission medium is stored in a required amount,
The transmitting probe 22 is arranged in this liquid so as to face upward. The transmission probe 22 is connected to a flaw detector 24 arranged outside the liquid tank 18, and the transmission probe 22 is set so as to oscillate a desired level of ultrasonic waves. Further, in the upper portion of the liquid tank 18, the inspection object 10 having the above-described configuration is held in a state in which the axis of the inspection object 10 is horizontal and the inspection portion of the outer first adhered member 12 is immersed in the liquid 20. It is supposed to be done.

A receiving probe 2 connected to the flaw detector 24.
6 is arranged so as to always come into contact with the shaft end surface of the inner second adhered member 14 of the inspection object 10 which is not immersed in the liquid 20. Further, the inspected article 10 is rotated by a rotation holding means (not shown), and the transmitting probe 22 is configured to move in parallel in the axial direction of the inspected article 10 via moving means (not shown). ing. This allows
All the bonded surfaces of the inspected product 10 can be inspected. It should be noted that the entire bonded surface can be inspected by rotating and axially moving the DUT 10 with the transmitting probe 22 fixed in a fixed position.

In the inspection apparatus according to the third embodiment, when the adhesive portion of the inspection object 10 is inspected, the inspection portion of the inspection object 10 is stored in the liquid tank 18 with the liquid 2
It is immersed in 0 and is held so that its part faces the transmission probe 22. In addition, the second in the inspection object 10
The receiving probe 26 is arranged so as to contact the shaft end surface of the adherend member 14. In this state, when an ultrasonic wave is oscillated from the transmitting probe 22 toward the outer peripheral surface of the inspected product 10, the ultrasonic wave incident on the inspected product 10 is the first adhered member of the inspected product 10. 12 and the adhesive 16 and the second
The transmitted wave that is multiple-reflected inside the adhered member 14 is received by the receiving probe 26. Then, the presence / absence of a defect is determined by the probe 24 based on the presence / absence of a transmitted wave detected by the receiving probe 26 according to the presence / absence of a defect in the adhesive portion. In addition,
By rotating the inspection object 10 and moving the transmitting probe 22 in parallel, the inspection of all the bonding surfaces of the inspection object 10 is performed.

[0022]

[Modification] The inspected article 10 inspected by the inspection method of the present invention is not limited to the one having the above-mentioned configuration,
For example, the targets shown in FIGS. For example, as shown in FIG. 8, the first adhered member 1 formed in a cylindrical shape
The inspected product 10 in which the shaft-shaped second adhered member 14 which is longer than the first adhered member 12 is inserted and bonded into the two through holes 12a.
Can be inspected. In the case of this example, the transmitting probe 22 is brought into contact with the outer peripheral surface of the first adhered member 12, and the second adhered member 14 protruding outward from the through hole 12a of the first adhered member 12 is provided. The inspection is performed with the receiving probe 26 in contact with the outer peripheral surface. Further, as shown in FIG. 9, in the case where the plate-shaped first adhered member 12 is adhered to the plate-shaped second adhered member 14 fixed to the wall 42 with the adhesive 16, The contact 22 is brought into contact with the outer end surface of the first adhered member 12, and the receiving probe 26 is contacted with the outer end surface of the portion of the second adhered member 14 which is separated from the first adhered member 12. By arranging, the transmission probe 22
A transmitted wave that is oscillated from the first adhered member 12 and the adhesive 16 and is multiple-reflected in the second adhered member 14,
Alternatively, the transmitted probe propagated through the surface layer of the second adhered member 14 can be received by the receiving probe 26. In the case of this example, the transmission probe 22 is moved along the first adhered member 12 to inspect the entire adhered surface.

Further, as shown in FIG. 10 (a), the adhesive 1 is placed in the through hole 12a of the first member 12 to be adhered formed into a rectangular tube shape.
The second adhered member 14 in the shape of a prism is adhered via 6 or the first and second adhered members 12 and 14 in the shape of a cylinder and a cylinder are curved as shown in FIG. 10 (b). Even formed ones can be inspected. See also FIG.
As shown in FIG. 1, in the case where the first adhered member 14, the second adhered member 16 and the third adhered member 46 are adhered to each other with the adhesives 16, 16, the transmission probe 22 is attached to the first adhered member 22. The receiving probe 26 is arranged to be in contact with the outer end surface of the adhesive member 12, and the receiving probe 26 is in contact with the outer end surface of the third adhered member 46 on the incident axis of the ultrasonic wave from the transmitting probe 12. This causes the transmitter probe 22 to oscillate and
The transmitted wave that has passed through the adhered member 12, the adhesive 16, the second adhered member 14, the adhesive 16 and the third adhered member 46 can be received by the reception probe 26.

In the embodiment, the metal-adhesive-metal product is taken as an example of the product to be inspected by the inspection method, but the present invention is not limited to this, and the resin-
It may be an adhesive-resin. That is, the object to be bonded with the adhesive is not limited to metal, and may be any material having a significantly different acoustic impedance from that of the adhesive. Further, in the inspection apparatus according to the third embodiment, the case where only the transmitting probe and a part of the inspection object are immersed in the liquid stored in the liquid tank has been described. It is also possible to inspect all the products and the receiving probe by immersing them in a liquid. Further, in the third embodiment, the transmitting probe and the receiving probe may be arranged so as to face each other with the inspected product interposed therebetween.

[0025]

As described above, according to the method and apparatus for inspecting an adhesive portion according to the present invention, it is possible to determine the state of adhesion of an inspected article adhered by an adhesive having acoustic impedance smaller than that of the adhered member. By inspecting with ultrasound,
It is possible to reliably determine the presence or absence of an internal defect in the adhesive portion. That is, the reliability of the inspection result is high and a high quality product can be guaranteed. Further, in the inspected product in which the second adhered member is adhered to the inside of the tubular first adhered member via the adhesive, the ultrasonic wave incident on the first adhered member is incident on the first adhered member. Since the receiving probe that is in contact with the second member to be adhered at a position deviated from the direction receives it, the transmitted wave in the state with little attenuation is surely detected, and the adhered state of the adhered portion is surely confirmed. It can be evaluated and the reliability is high.

[Brief description of drawings]

FIG. 1 is a first example of a method for inspecting a bonded portion according to the present invention.
It is a schematic diagram of an inspection device of an example.

FIG. 2 is a block diagram showing an electric circuit of the inspection apparatus according to the first embodiment.

FIG. 3 is an explanatory diagram showing a transmission state of ultrasonic waves.

FIG. 4 is a graph showing a sound pressure of a transmitted wave when a bonding portion has a defect and when there is no defect.

FIG. 5 is a second diagram for carrying out the method for inspecting an adhesive portion according to the present invention.
It is a schematic diagram of an inspection device of an example.

FIG. 6 is a third view for carrying out the method for inspecting an adhesive portion according to the present invention.
It is a schematic diagram of an inspection device of an example.

FIG. 7 is an explanatory diagram showing a state before adhesion of an inspected product.

FIG. 8 is a schematic view showing another example of the inspected product inspected by the method for inspecting an adhesive portion according to the present invention.

FIG. 9 is a schematic view showing another example of the inspected product inspected by the method for inspecting an adhesive portion according to the present invention.

FIG. 10 is a schematic view showing still another example of the inspected product inspected by the method for inspecting an adhesive portion according to the present invention.

FIG. 11 is a schematic view showing still another example of the inspected product inspected by the bonding portion inspection method according to the present invention.

FIG. 12 is a flowchart of an inspection performed by the inspection device according to the first embodiment.

[Explanation of symbols]

 10 Inspected Product 11 Ultrasonic Flaw Detector 12 First Bonded Member 14 Second Bonded Member 16 Adhesive 18 Liquid Tank 20 Liquid 22 Transmitting Probe 24 Flaw Detector 26 Receiving Probe 46 Third Bonding Member

Claims (5)

[Claims] 1. Two members to be adhered (12, 14) with an adhesive (16)
A method for inspecting the bonding state of the bonded part in the inspected product (10) obtained by bonding the ultrasonic wave oscillated from the transmitting probe (22) in the ultrasonic flaw detector (11). , Incident on the adhesive portion from the first adhered member (12) side of the inspected product (10), penetrates the first adhered member (12) and the adhesive (16), and passes through the second adherend. The transmitted wave that is multiple-reflected in the adhesive member (14) or the transmitted wave that propagates in the surface layer of the second adherend member (12) is deviated from the incident direction of the ultrasonic wave from the transmitting probe (22). Ultrasonic flaw detection device (1
The inspection of the adhesive part, which is characterized in that the state of the adhesive part is inspected from the sound pressure of the transmitted wave received by the receiving probe (26) in 1) and received by the receiving probe (26). Method. 2. A bonded state of a bonding portion of an inspected product (10) obtained by bonding a second bonded member (14) to a first bonded member (12) via an adhesive (16). A transmitting probe (22) for injecting an ultrasonic wave from the outside of the first adhered member (12) toward the adhesive portion, and a second adhered member (14). The second member to be adhered is arranged so as to come into contact with a portion deviated from the incident direction of the ultrasonic wave from the transmitting probe (22), penetrates the first member to be adhered (14) and the adhesive (16), and A receiving probe (26) for receiving a transmitted wave that is multiple-reflected inside (14) or a transmitted wave that propagates in the surface layer of the second adherend member (12), and the receiving probe (26) Evaluating means for inputting the transmitted wave received by the device and evaluating the state of the adhesive portion from the sound pressure of the transmitted wave.
(24) An inspection device for an adhesive portion, characterized in that 3. A plurality of members to be adhered (1) via an adhesive (16).
2,14,46) to be inspected by bonding them to each other
A device for inspecting a bonding state of a bonding portion in (10), which is disposed so as to face the inspected product (10) so as to face the inspected product (10) and transmits an ultrasonic wave. Credit probe (22), a plurality of adhered members (12, 14, 46) and a receiving probe (26) for receiving transmitted waves that have passed through the adhesive (16), and the receiving probe (26) The transmitted wave received in is input, and the evaluation means for evaluating the state of the adhesive portion from the sound pressure of the transmitted wave.
(24) An inspection device for an adhesive portion, characterized in that 4. The inspected product (10) has a shaft-shaped or tubular second adhered member (12) with an adhesive (16) inside a cylindrical first adhered member (12). The inspection device for an adhesive portion according to claim 2 or 3, wherein: 5. The transmitting probe (22) is immersed in a liquid (20) as an ultrasonic wave transmission medium stored in a liquid tank (18), and the inspected product (10). The adhesive inspection device according to any one of claims 2, 3 and 4, wherein at least an inspection site is held in a state of being immersed in the liquid (20).