JPS61230053A - Non-contact peel inspecting device - Google Patents

Abstract

PURPOSE:To inspect properly the peel state by giving a magnetic field to a conductive subject to be heated under a non-conductive material through a guide heating means and detecting the heat diffusion state at this time by an infrared ray camera. CONSTITUTION:The overall tester is placed on a self-traveling carriage, and an induction coil 5 is shifted in the state where it is separated from the surface of the non-conductive material by the prescribed distance. A guide heating device 4 supplies an AC exciting signal to the induction coil 5 with the aid of a signal from a control part 7, and forms an AC magnetic field in the inductive material to be heated 1. An excessive current flows in the subject to be heated 1, and its surface is heated to warm the non-conductive material 2. When it develops a peel part 2a, the heat diffusion state in this part is different from that of the non-peel part. The infrared ray camera 6 measures the temperature of the subject to be heated 1 and transmits the temperature to a signal processing part 9. A two-dimensional distribution picture is formed in the processing part 9, displayed on a CRT display 10 and recorded in a video recorder 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a non-contact peeling inspection device for inspecting the peeling state of a non-conductive material superimposed on the surface of a conductive metal such as copper.

[Technical background of the invention and its problems] Conventionally, in a composite material having a structure in which a non-conductive material such as ceramic is superimposed on the surface of a conductive metal such as copper, it has been used as a means to inspect the peeling state of the non-conductive material. There is a method in which a person hits the surface of a composite material with a hammer or the like, and the state of peeling is determined based on the sound of the impact. However, this testing method relies on the experience and preferences of the inspector, and is subject to subjectivity, making it difficult to obtain accurate judgments. Additionally, due to environmental and safety concerns, there are some defects that cannot be inspected in areas that are inaccessible to humans.

On the other hand, as a conventional inspection means of this type, there is a means of inspecting the peeling state of a non-conductor by ultrasonic flaw detection using a probe. However, this testing method may cause errors if there is an acoustic medium such as water between the metal surface and the non-conductor, or if the non-conductor is not peeled off due to the pressure of the probe. It has some disadvantages. Furthermore, the probe must be brought into contact with a non-conductor during measurement, which causes problems such as the peeled portion becoming larger and the non-conductor being damaged.

Furthermore, there is a means for detecting the thermal diffusion state that changes due to the peeling of the non-conductor using an infrared camera, and thereby inspecting the peeling state. However, with this method, if the composite material is kept at a constant temperature for a long period of time, no temperature difference can occur, and therefore it has not been possible to accurately inspect the composite material.

[Purpose of the invention]

The present invention has been made in light of these circumstances,
The purpose is to provide a non-contact peeling inspection device that can efficiently and accurately measure the peeling state of a non-conductive material on the surface of a conductive heated object without contact.

[Summary of the Invention] The present invention applies a magnetic field to a conductive heated object under a non-conductive material using induction heating means to create a thermal diffusion state caused by a peeling state, and detects this thermal diffusion state with an infrared camera. This is a non-contact peeling inspection device that inspects the peeling state by displaying both peaks of the temperature distribution.

[Embodiments of the invention]

FIG. 1 is a system diagram showing the configuration of an embodiment of the present invention.

In the figure, reference numeral 1 denotes an electrically conductive heated object such as a steel pipe, and a non-conductive material 2 such as ceramic is superimposed on the surface of this electrically conductive heated object 1 to a predetermined thickness. Note that the conductive heated object 1 may be made of any material as long as it causes heat loss through induction heating, and the non-conductive material 2 may be formed on either or both of the outer surface and the inner surface of the tube. Sometimes they are superimposed. 2a indicates a peeled portion of the non-conductor 2. 3 indicates an induction heating means, which is an induction heating device l! that outputs an AC excitation signal. f4, and an induction coil 5 which receives an AC excitation signal from the heating device 4 and applies an AC magnetic field into the conductive heated object 1. Infrared cameras 6 are arranged at regular intervals at the rear of the induction heating means 3. In practice,
Although not shown, these components 4, 5, 6 are supported by a frame or a housing in a desired positional relationship, and operate in response to control signals from the control section 7. This control section 7 receives a speed signal from a speedometer 8 and controls the induction heating means when almost all of the present device is mounted on a self-propelled trolley or the like and runs at an indefinite speed in the six directions of arrows in the figure. 3. Control the infrared camera 6. Specifically, a control signal is given to the induction heating device ff4 to increase the heating temperature by the induction heating means 3 in proportion to the speed of the bogie detected by the speedometer 8, and a control signal is given to the infrared camera in proportion to the speed of the bogie. Control is performed to increase the scanning speed of step 6.

Therefore, when the truck speed is determined in advance, the control section 7 may perform control based on the already known truck speed, and in this case, the speedometer 8 is not necessarily required. 9 is a signal processing unit that obtains one two-dimensional temperature distribution image from the output data from the infrared camera 6 and the scanning timing output from the control unit 7, and outputs it to the CRT display 10 and video recorder 11. It becomes.

That is, the output data of the infrared camera 6 is converted into binarized data or digital data with a difference in level r14, stored in an image memory (not shown), read out in accordance with the scanning timing from the control unit 7, converted into analog data, and subjected to brightness modulation. After converting it into a signal or a color display signal, it is output to a CRT display 10 for display, and is also output to a video recorder 11 for recording.

Next, the effects of this device configured as described above will be explained. The entire device, including or excluding the CRT display 10 and video recorder 11, is placed on a self-propelled trolley, and with the induction coil 5 separated by a predetermined distance from the surface of the non-conductor 2, it is moved in the direction indicated by the arrow in FIG. move in the direction.

During this movement, the control unit 7 receives a temperature signal of the conductive object 1 including the non-conductor 2 measured by the infrared camera 6. At this time, the control unit 7 controls the induction heating means 3 and the infrared camera 6 based on the speed signal from the speedometer 8 or a speed signal that can be known in advance. That is, the induction heating device R4 receives a control signal from the control unit 7 and operates the induction coil 5.
An alternating current excitation signal is supplied to the inductive heated object 1 to form an alternating magnetic field. As a result, an overcurrent flows in the inductive heated object 1 due to the alternating current magnetic field, an overcurrent loss and a hysteresis loss occur, and the surface of the heated object 1 generates heat. When the surface of the heated object 1 generates heat, the heat is diffused into the non-conductor 2.
warm up. Here, if the non-conductor 2 has a peeled part 2a as shown in FIG. 1, this! ! The thermal diffusion state in the No. 11 portion 2a is different from the thermal diffusion state in the non-peeled portion.

For example, when the outside air temperature is 20° C., if the heating temperature is set to 50° C. and a temperature difference of 30° C. from the outside air is set, a temperature difference of about 6° C. will appear between the peeled portion 2a and the non-peeled portion. Note that when the moving speed of the device is fast, the control section 7 controls the heating temperature by the induction heating device 4 in proportion to the speed in order to ensure the heating temperature.

After heat is diffused by the induction heating means 3 in this way, the temperature is measured by the infrared camera 6 and this temperature signal is sent to the signal processing section 9. Then, in the signal processing section 9, one two-dimensional temperature distribution image is constructed according to the scanning timing sent from the control section 7, and is displayed on the CRT display 10, and also displayed on the video recorder 11.
recorded in

FIG. 2 is a diagram showing a display screen of the CRT display 1o, that is, a temperature distribution image. In the figure, M indicates a high temperature part in a normal state, and N in the figure indicates a low temperature part, which is the peeled part 2a of the non-conductor 2.

As described above, according to the present apparatus, by viewing the temperature distribution image displayed on the CRT display 10 or recorded on the display 11, the peeling state of the non-conductor 2 can be inspected with high precision.

Note that the present invention is not limited to the above embodiments.

For example, in the embodiment described above, the induction coil 5 and the like are moved, but the conductive heated object 1 may be moved. Further, although the present device uses a self-propelled trolley, it goes without saying that it can also be applied to a vehicle in which a person rides on the trolley. Of course, various other modifications can be made without departing from the gist of the present invention.

(Effects of the Invention) As described in detail above, according to the present invention, a magnetic field is applied to the conductive heated object under the non-conductive material by induction heating means to create different thermal diffusion states depending on the peeling state, and this thermal diffusion state Since the peeling state is inspected by detecting it with an infrared camera and displaying it as a temperature distribution image, it is possible to efficiently and accurately measure the peeling state of a non-conductive material on the surface of a conductive heated object without contact. It is possible to provide a non-contact peel inspection device that can obtain the desired results.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a diagram showing a temperature distribution image obtained by the practical example. DESCRIPTION OF SYMBOLS 1... Conductive heated object, 2... Non-conductor (ceramic), 2a... Peeling part, 3... Induction heating means, 4...
...Induction heating device, 5...Induction coil, 6...Infrared camera, 7...Control unit, 8...Speedometer, 9...
Signal processing section, 10...C-KiT display, 11.
...Video recorder.

Claims (1)

[Claims] In a peel inspection device that inspects the peeling state of a non-conductive material superimposed on a conductive heated object, the device is installed at a predetermined distance from the surface of the non-conductive material, and applies a magnetic field to the conductive heated object to determine the peeled state. induction heating means for forming different thermal diffusion states; an infrared camera for detecting the thermal diffusion states formed by the induction heating means; and relatively moving the conductive heated object, the induction heating means, and the infrared camera. ,
A control section that controls the induction heating means and the infrared camera according to the moving speed at this time or a predetermined moving speed, and a temperature distribution using the signal output from the control section and the output from the infrared camera. 1. A non-contact peel inspection device comprising: display means for displaying an image.