JPH06273314A - Material inspection apparatus - Google Patents

Abstract

PURPOSE:To provide a technology for determining the characteristics of an object by hitting the object with a probe and detecting the repulsive acceleration thereof in which the joint condition at a honeycomb brazed part can be ascertained accurately by hitting the object periodically with the probe through a motor and then converting the repulsive acceleration into a signal and recording. CONSTITUTION:A probe 4 is lifted and then a surface plate 1 is hit by the probe 4 urged by a spring. The probe 4 is subjected to repulsive accelerated and a permanent magnet 5 fixed to the probe 4 interacts with a detection coil 6 to generate electromotive force. The electromotive force is recorded by a recorder 9 and pass/fail of the brazed part of the surface plate 1 and a core 3 is decided based on the record.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material inspection device,
In particular, in a laminated material such as a honeycomb material that is used for a structure for railway vehicles or an aircraft, an inner core having a honeycomb shape,
The present invention relates to a material inspecting apparatus suitable for inspecting an adhesion or joining state of an adhesion portion or a brazing portion with a face plate which is sandwiched.

[0002]

2. Description of the Related Art As a simplest method for inspecting the adhering state of composite materials, a tapping sound check for checking the filling state of the content liquid in a wooden barrel is known. As a method of inspecting the adhesion state of the material, the Japan Society of Mechanical Engineers 1st Conference on Transportation and Logistics, Proceedings (1992, 1
The cointapping method introduced in “Development of automatic inspection system for aircraft rotor blade honeycomb structure” in January 24-27) uses the principle of tapping sound inspection. In addition, in order to eliminate such ambiguity that relies on the human sense, it is possible to automatically detect the presence or absence of peeling by receiving and analyzing the vibration by the vibration exciter introduced in the above document and the vibration of the face plate surface caused by it. An inspection device has been developed to efficiently inspect large materials as a whole. On the other hand, there is a method of using ultrasonic waves as a method completely different from these principles, and a C scope method that can show a bonded state of a honeycomb material as a plane image using a commercially available device and a B scope method that shows as a cross-sectional image. There is. These devices are mainly used in the aircraft industry as inspection devices for honeycomb materials, and their effectiveness has been confirmed.However, the vibration method is a large-scale device, and the ultrasonic method uses a material surface or a bond surface boundary. There was a risk of making a wrong decision depending on the shape, and there was no compact and highly reliable device.

[0003]

As described above, the prior art does not have a device that is highly portable and capable of inspecting with high accuracy, and it is difficult to easily inspect the bonding state between the inner core of the honeycomb material and the face plate on site. Met.

An object of the present invention is to extract the repulsive acceleration received by the probe from the face plate as an electric signal when the probe is forcibly struck on the face plate of the laminated material, and to extract its strength. An object of the present invention is to provide an apparatus for inspecting the adhesion state of the face plate and the core by looking at it, and capable of easily and accurately inspecting on-site according to various manufacturing forms using laminated materials.

[0005]

In order to achieve the above object, as a method of forcibly striking the probe on the face plate of the laminated material, a probe attached to slide smoothly in the vertical direction is used. The lifting pin attached to the rotating plate that rotates by the drive and the lifting arm that moves in a fan shape by hitting this pin lifts it upwards at a constant cycle, and the lifting pin deviates from the radius of rotation of the lifting arm and is attached to the upper end of the probe. The probe spring hits the probe onto the face plate.

On the other hand, the probe struck on the face plate is repelled by the face plate. As a method of measuring the acceleration of the repulsion, a permanent magnet is attached to a certain portion on the probe and the passage point of the permanent magnet is set. A detection coil is arranged in the form of surrounding a permanent magnet, and the acceleration of repulsion of the probe can be taken out as an electromotive force by using the principle of electromagnetic induction. To facilitate observation,
It is possible to confirm the bonding and joining state of the laminated face plate and core from the magnitude of the starting force signal.

[0007]

When the disk with the lifting pin is rotated, the disk is lifted when the lifting pin hits the tip of the lifting arm, and the probe needle is also lifted accordingly. When the disk is rotated further, the lifting arm comes off the lifting pin,
The probe is repulsed by the spring attached to the upper end of the probe,
It is struck on the face plate of the laminated material. In the mechanism that operates like this, when the disk is rotated by a motor,
The probe needle is lifted at a constant cycle and repeats up and down motions of hitting, and immediately after hitting, the face plate of the laminated material receives the repulsion and has a repulsion acceleration according to the repulsion characteristic of the face plate. At this time, since the permanent magnet attached to the probe passes through the detection coil with the same acceleration, electromotive force is generated between the detection coil terminals, and this is electrically processed and output to a recorder or the like. By grasping the repulsion characteristics of the face plate, that is,
Defective parts such as non-bonding of face plate and core can be detected. If the probe needle under such a mechanism is manually or automatically scanned along the face plate, and recorded and observed, the bonding state of the face plate and the core can be easily known.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment and another embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a front plate that constitutes the honeycomb material, 2 is a back plate, and 3 is a core that maintains the strength of the honeycomb material, and the planar shape thereof is usually a hexagon (not shown). The front plate 1 and the back plate 2 are contact points with the core 3,
Each is brazed, and the present invention is to inspect whether or not the brazed portion is peeled off. On the other hand, 4 is a probe needle, 5
Is a permanent magnet, 6 is a detection coil, and the permanent magnet 5 is fixed at a fixed position of the probe 4, and moves up and down along with the vertical movement of the probe 4, and can penetrate the hole axis of the detector coil 6. Has become. In FIG. 1, the states of a, b, c, d, and e are the repulsive state (direction indicated by the arrow in the figure) that occurs after the probe needle 4 is struck on the surface plate 1, depending on the bonding state of the surface plate 1 and the core 3. It shows how it changes.

Next, 7 is an amplifier for an electric signal generated by the interaction between the permanent magnet 5 and the detection coil 6, 8 is a detector, and 9 is a recorder, which is a ', b'at the bottom of FIG. ，
This is an electric circuit for obtaining the repulsive signal waves 10 shown by c ', d', and e'on the recorder 9.

In such a structure, when the probe needle 4 is struck on the surface plate 1, the repulsive state of the probe needle 4 is a depending on the presence or absence of the inner core 3 and the brazing state at the contact point between the surface plate 1 and the core 3. , B, c, d, e. State a is a state in which the surface plate 1 and the core 3 are completely joined by brazing, and the kinetic energy of the probe 4 and the permanent magnet 5 struck on the surface plate 1 is absorbed by the core 3, so Needle 4
The repulsive acceleration of the permanent magnet 5 is small, and the detection coil 6
Since the interaction with and is small, a small repulsive signal wave 10 is obtained as shown in the state a '.

Next, at the position of state b, since the core 3 does not exist under the surface plate 1, the probe needle 4 and the permanent magnet 5 are provided.
The repulsive acceleration received by the
(State b ') is obtained. Further, at the position of state c, the core 3 is below the surface plate 1, but since the brazing is in a peeled state, the repulsive acceleration of the probe 4 and the permanent magnet 5 has the same tendency as in the case of state b. , A large repulsive signal wave 10 is obtained as in the state c ′. The states d and e are the states b
And a, respectively, and the repulsive signal wave 10 in the states d'and e'is obtained.

As described above, according to the present invention, the positional relationship between the front surface plate 1 (or the rear surface plate 2) and the core 3 and the bonding state can be distinguished by the magnitude of the repulsion signal. If scanning is performed while continuously striking the face plate 2), the face plate 1 of the honeycomb material 1
It is possible to nondestructively inspect the brazed joint state between the core plate 3 (or the back plate 2) and the core 3.

In the embodiment shown in FIG. 2, the probe 4 is continuously connected to the front plate 1 (or the rear plate 2) based on the principle of FIG.
It was devised so that the state of joining with the core 3 over the entire honeycomb material could be inspected by hitting it on the above and obtaining many repulsive signal waves, and the same symbols as in FIG. 1 indicate the same members. Reference numeral 11 is a main body frame that supports all the mechanisms, 12 is a rotary plate driven by a motor (not shown), 13 is a lifting pin fixed to the rotary plate 12, and 14 is periodical by the lifting pin 13 as the rotary plate 12 rotates. It is a lifting arm that receives lifting force in a fan shape. Reference numeral 15 is the center of the lifting arm that is the center of rotation of the lifting arm 14, 16 is a support frame that supports the center 15 of the lifting arm, and 17 is a spring that gives a force to strike the probe 4 on the front plate 1 (or the back plate 2). Reference numeral 18 is a weight for adjusting the repulsive acceleration of the probe 4, which is fixed to the probe 4. Furthermore, 1
Reference numeral 9 is a guide frame of the probe needle 4.

In such a structure, when the main body frame 11 is placed on the surface plate 1 and the rotary plate 12 is rotated counterclockwise, the lifting pins 13 mounted near the outer periphery of the rotary plate 12 are lifted by the lifting arms 14. Lifting, the weight 18 and the exploration needle 4 move upwards in conjunction with this, and the upper end of the exploration needle 4 presses the spring 17. When the rotary plate 12 rotates further,
Since the lifting pin 13 deviates from the turning radius of the lifting arm 14, the lifting arm 14, the weight 18, and the probe 4
While falling, the tip of the probe 4 is struck by the surface plate 1 by the spring force of the spring 17. At this time, the probe 4 and the weight 18 obtain the repulsive acceleration according to the combination state of the surface plate 1 and the core 3 as described with reference to FIG. 1, so that the permanent magnet 5 fixed to the probe 4 has the same repulsive acceleration. Penetrating through the detection coil 6 (or approaching the detection coil 6)
Then, an electromotive force is generated in the detection coil 6. When the rotating plate 12 is rotated by the motor, the probe 4 is struck on the surface plate 1 at a constant cycle. Therefore, if the main body frame 11 is scanned along the surface plate 1, the surface plate 1 and the core 3 are combined. You can see the change in repulsive acceleration. Therefore, it is possible to easily find the brazing peeling state between the surface plate 1 and the core 3 in the honeycomb material.

FIG. 3 shows another embodiment of the present invention, in which 20 is a lifting lever fixed to the same rotary shaft as the lifting arm 14, 21 is a thrust bar for pushing the lifting lever 20 by the force of a spring 17, Reference numeral 22 denotes a thrust rod guide, and 23 denotes a bearing for smoothing the movement of the thrust rod 21. Other reference numerals that are the same as those in FIGS. 1 and 2 are the same members.
When the rotating plate 12 is rotated counterclockwise by a motor (not shown), the lifting pin 13 lifts the lifting lever 20 at a constant cycle, and the lifting arm 1 fixed to the lifting arm shaft 15 is provided.
4 is lifted, and the probe 4 and the weight 18 fixed to the probe 4 and the permanent magnet 5 attached to the probe 4 are simultaneously lifted. The lifting lever 20 pushes the thrust bar 21 as the lifting pin 13 rotates, and pushes and retracts the spring 20. When the rotating pin 13 is out of the radius of rotation of the lifting lever 20, the lifting lever 2
0 is struck by the thrusting rod 21 which has obtained the spring force of the spring 17, so that the probe needle 4 is struck on the surface plate 1 via the lifting arm 14.

According to this structure, the inspection function is the same as that of the above embodiment, but the size is reduced in order to improve the handling. Further, the probe needle 4, the lifting arm 14 and the weight 18 are provided so that the probe needle 4 can be hit not only downward but sideways or upward so as to hit with less resistance.
And the lifting arm shaft 15 is used as a rotary shaft to hammer down the hammer. Along with this, the lifting lever 20, the thrust rod 21, the thrust rod guide 22, the bearing 2
3 is separately provided so that the probe needle 4 can be lifted and hammered smoothly.

[0017]

According to the present invention, since the operation of hitting the probe with the laminated material by the spring force can be continuously performed, the repulsive acceleration of the laminated material generated at that time is applied to the probe with the permanent magnet. Due to the interaction of the detection coils facing each other, it is possible to continuously take out as an electric signal, and it is possible to accurately and efficiently inspect the defective joining state of the laminated material.

[Brief description of drawings]

FIG. 1 is a side view of an inspection state showing the principle of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

4 ... Probing needle, 5 ... Permanent magnet, 6 ... Detection coil, 7 ... Magnifier, 8 ... Detector, 9 ... Recorder.

Claims (1)

[Claims] 1. A probe needle movably supported in an axial direction,
A spring mechanism that strikes the probe against the surface of the object to be inspected, a crank mechanism that moves the probe against the spring force of the spring mechanism, a permanent magnet installed on the probe, and the permanent magnet passes through. A material inspection apparatus comprising a detection coil provided so as to surround a part of a path, and a recording means for recording an electromotive force of the detection coil.