KR100667035B1 - Defect monitoring apparatus and method of metallic material - Google Patents

Abstract

The present invention provides a metal defect detection apparatus and method for detecting defects of a workpiece such as metal materials and structures using heat graphs. The defect detection apparatus according to the present invention comprises a sensor module, an actuator unit and a computer. The metal defect detection method for detecting a defect of a workpiece such as a metal material or a structure by using a defect detection apparatus of the metal material is to connect a temperature control unit to the workpiece, if necessary, so that the workpiece has a temperature distribution unit. When the workpiece has a defined temperature distribution, the actuator unit is operated to move the sensor module horizontally with respect to the workpiece so that the displacement of the distance by the actuator unit through the actuator unit and the computer electrically connected to the sensor module The thermal graph of the temperature deviation of the workpiece detected by the plurality of infrared temperature sensors of the sensor module is displayed.

Description

DEFECT MONITORING APPARATUS AND METHOD OF METALLIC MATERIAL}

1 is a block diagram for explaining a defect detection apparatus for a metal material according to the present invention;

2 is a view for explaining a defect detection apparatus of a metal material according to a preferred embodiment of the present invention;

3 is a view for explaining the horizontal positional relationship of the sensor module and the workpiece in the defect detection device of FIG.

4 is a view for explaining the sensor module in the defect detection device of FIG.

5 is a view for explaining an infrared temperature sensor in FIG. 4 in detail;

6 is a circuit diagram of the amplifier in FIG. 4;

7 is a test workpiece of aluminum material for testing a defect detection apparatus of a metal material according to a preferred embodiment of the present invention;

8 is a graph showing a result of measuring the workpiece of FIG. 7 in a low temperature region by using a defect detection apparatus of a metal material according to a preferred embodiment of the present invention;

9 is a graph showing the results of measuring the workpiece of FIG. 7 in a high temperature region by using a defect detection apparatus of a metal material according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: defect detection device (of metal)

20: sensor module 22: circuit board

24: power supply terminal 26: signal terminal

28: variable resistor 30: amplifier

40: infrared temperature sensor 42: light receiving element

44: sensor cover 46: sensor window

50: holder 60: actuator unit

62: motor 62: screw

66: electrometer 80: A / D converter

90: computer 100: temperature control unit

110: SLIDAX 120: heater

130: cooler 200: the workpiece

210: slot 300: base

The present invention relates to a metal defect detection device and method, and more particularly to a metal defect detection device and method that can detect the defect of the workpiece in a non-destructive method, such as in the process industry using metal equipment or structures. It is about.

Generally, metal defects are measured using a non-destructive defect detection apparatus using radioactive materials, X-rays, and the like. However, these defect detection devices are expensive and have many problems because they deal with dangerous substances. In order to detect defects of metal materials using these defect detection devices, it is necessary to completely or partially stop the work process. Therefore, the measurement is limited in the actual work process due to time and economic cost.

On the other hand, the recent development of the thermal graph defect detection technology has been very helpful in solving the problems of the non-destructive defect detection device. The defect detection apparatus using a thermal graph is used to detect defects of materials in composite materials, plates, and thermal barrier coatings. However, infrared cameras used for such thermal graph defect detection are expensive, and limited image resolution is not suitable for detecting defects of a small metal material.

The present invention is to solve such a problem, the object of the present invention is to detect the defects of the metal material in a lower cost and more stable way than the non-destructive defect detection device using a radioactive material, X-ray, etc. to detect the defects of the conventional metal material The present invention provides a novel apparatus and method for detecting defects of metal.

It is also an object of the present invention to provide a new type of metal defect detection apparatus and method that can be manufactured at a lower cost than the conventional metal defect detection apparatus using a heat graph.

According to a feature of the present invention for achieving the above object, the present invention is a metal defect detection device for detecting a defect of a workpiece such as metal materials and structures using a thermal graph, a plurality of infrared temperature sensors are installed A sensor module for detecting a temperature radiated from the workpiece and generating the electrical signal; An actuator unit coupled to the sensor module for varying the position of the sensor module relative to the workpiece and generating the displacement as an electrical signal; It includes a computer that is connected to the sensor module and the actuator unit is a program for receiving the electrical signal generated from the sensor module and the actuator unit is converted into a thermal graph to show.

In the present invention as described above, the sensor module includes a circuit board; An infrared temperature sensor electrically connected to the circuit board, the infrared temperature sensor being installed so as to be positioned in parallel with one side of the circuit board; A variable resistor electrically connected to the circuit board and installed to control the output of the infrared temperature sensor; And an amplifier electrically connected to the circuit board to amplify the electrical signal.

In the present invention as described above, each of the plurality of infrared temperature sensors may be provided to surround the light receiving element, and may further include a cover having a sensor window formed therethrough with a predetermined size thereon.

In the present invention as described above may be further provided with a temperature control unit for controlling the temperature of the workpiece is coupled to the workpiece.

According to another feature of the present invention for achieving the above object, the present invention is a defect detection method of a metal material for detecting a defect of a workpiece, such as a metal material and a structure as a metal defect detection device according to claim 4, Connecting the temperature control unit to the workpiece to operate the temperature control unit such that the workpiece has a defined temperature distribution; Operating the actuator unit when the workpiece has a predetermined temperature distribution to move the sensor module horizontally with respect to the workpiece, the actuator unit via a computer electrically connected to the actuator unit and the sensor module. The thermal graph for the displacement of the distance and the temperature deviation of the workpiece detected by the plurality of infrared temperature sensors of the sensor module.

Defect detection apparatus and method of a metal material according to the present invention uses a sensor module having an infrared temperature sensor. Such an infrared temperature sensor is inexpensive compared to an infrared camera and thus is suitable as a defect detection sensor of metal material as an alternative to an infrared camera. Such a metal defect detection device has an advantage that it can be manufactured at low cost in detecting metal defects, and it solves the cost and time problems of other non-destructive defect detection devices, and thus, it is possible to detect metal defects in many process industries. Can be used. In particular, the defect detection device of a metal material according to the present invention solves a problem that the defect detection device of a conventional metal material has a lot of time and economic cost, and because it handles dangerous substances such as radioactive materials, there are many restrictions on the practical use in industrial applications. Because of the use of thermal graph defect detection techniques, on-line measurements can be made during the actual process, and can be applied to many parts because there is no downtime.

1 is a block diagram for explaining a defect detection apparatus for a metal material according to the present invention.

Referring to FIG. 1, the combined detection device 10 of a metal material according to the present invention includes a sensor module 20, an actuator unit 60, and a computer 90 to perform work on a metal material and a structure using a thermal graph. And to detect defects of water. In this case, by adding the temperature control unit 100 as necessary, an effective detection can be made. That is, since the temperature of the metal materials is high enough in practical applications, external heating is not necessary. However, when the temperature of the laboratory or the metal materials is not sufficient, the temperature control unit 100 is added to one side of the metal material to artificially adjust the temperature. It may be possible to form a distribution.

Sensor module 20 is a plurality of infrared temperature sensor 40 is installed to detect the temperature radiated from the workpiece 200 is generated as an electrical signal, the actuator unit 60 is coupled to the sensor module 20 The position of the sensor module 20 is varied with respect to the workpiece 200 and the displacement is generated as an electrical signal. The computer 90 is connected to the sensor module 20 and the actuator unit 60 to receive an electric signal generated from the sensor module 20 and the actuator unit 60 to convert the thermal graph into a thermal graph. And display the result. And the temperature control unit 100 is coupled to the workpiece 200 to adjust the temperature of the workpiece 200 so that the workpiece 200 has a constant temperature distribution.

The metal defect detection method for detecting a defect of a workpiece such as a metal material and a structure by the metal defect detection device 10 is, first, by connecting the temperature control unit 100 to the workpiece 20 to the workpiece ( The temperature control unit 100 is operated so that 200 has a predetermined temperature distribution. Of course, the use of such a temperature control unit 100 is limited only when it is necessary to increase the temperature of the workpiece 200 to be detected. When the workpiece 200 has a predetermined temperature distribution, the actuator unit 100 is operated to move the sensor module 20 horizontally with respect to the workpiece 200 to display a thermal graph in the computer 90. You will get the data. That is, the computer 90 is electrically connected to the actuator unit 60 and the sensor module 20 to detect the displacement of the distance by the actuator unit 60 and the plurality of infrared temperature sensors 40 of the sensor module 20. The thermal graph for the temperature deviation of the finished workpiece 200 is displayed.

In order to verify the performance of the apparatus for detecting defects of metals according to the present invention, an aluminum plate having artificial defects was tested through online measurement as in the preferred embodiment of the present invention described below.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 2 to 9, and like reference numerals denote like elements for performing the same functions in FIGS. 1 to 9. On the other hand, the drawings and detailed description of the configuration that can be easily seen from the defect detection apparatus and method of a common metal material in each of the drawings are shown briefly or omitted and the parts related to the present invention. In particular, there are parts in which the size ratio between the elements is somewhat different or the sizes between the components coupled to each other are different. However, the differences in representation of the drawings are easily understood by those skilled in the art. A separate description is omitted.

2 is a view for explaining a metal defect detection device using an infrared temperature sensor in accordance with a preferred embodiment of the present invention, Figure 3 is to explain the horizontal positional relationship of the sensor module and the workpiece in the defect detection device of FIG. 4 is a view for explaining the sensor module in the defect detection device of Figure 2 in detail, Figure 5 is a view for explaining the infrared temperature sensor in Figure 4, Figure 6 is an amplifier in Figure 4 Is a circuit diagram.

1 to 3, a defect detecting apparatus 10 of a metal material according to an exemplary embodiment of the present invention may include a temperature control unit 100, a sensor module 20, an actuator unit 60, and a computer 90. It is made. Although not shown in detail, such a defect detection apparatus 10 will be configured to be supported by the base 300 forming the skeleton of the device as shown in FIG.

The actuator unit 60 is coupled to the sensor module 20 to vary the position of the sensor module 20 with respect to the workpiece 200 and to generate the displacement as an electrical signal, which can be slid to the base 300. It is installed so that the holder 50 for holding and fixing the sensor module 20, the motor 62 for generating a driving force for transporting the sensor module 20, coupled to the holder 50, the driving force of the motor 62 Rotating by the holder (50) is carried by the motor 62 to measure the distance displacement of the screw 62, the sensor module 20, so that the sensor module 50 is transported by the holder 50 is transferred. Or an electrometer 66 for measuring the displacement of the sensor module 20. Of course, such an actuator unit 60 may be applied to various methods for displacing the distances of the X, Y, and Z axes that are generally applied to the measuring device.

Temperature control unit 100 is provided with a slide (110, voltage regulator), heater 120, cooler 130. Such a temperature control unit 100 is a configuration for controlling the temperature by heating or cooling the work 200 in order to have a constant temperature distribution of the work 200, as described above, does not apply. In this embodiment, the temperature control unit 100, the heater 120 is attached to the upper portion of the workpiece 200, as shown in Figure 2, the cooler 130 made of a cooling tube flowing coolant in the lower portion To be attached to the bottom of the workpiece 200. At this time, the heater 120 used was an electric heating element of 10mm in diameter, 10.7mm in length, and controlled the heat generation by controlling the supply voltage to the slide dax 110, the cooler 130 is installed in the lower cooling tube This 3 / 8-inch copper tube was used to allow a 5 ° C coolant to be circulated by an external circulation bath with temperature control at 5.4 L / min. At this time, as will be described later, the reference temperature at the upper and lower ends of the workpiece 200 (an aluminum flat plate) having artificial defects was measured by a thermocouple and displayed through a temperature indicator.

The computer 90 is connected to the sensor module 20 and the actuator unit 60 to receive an electric signal generated from the sensor module 20 and the actuator unit 60 to convert the thermal graph into a thermal graph. The amplified voltage signal from each infrared temperature sensor 40 of the sensor module 20 and the position signal from the electrometer 66 in the form of a 10-wheel wheel are converted into digital signals by the A / D converter 80. It can be converted and saved, and converted to a thermal graph by the program for display.

4 to 6, the sensor module 20 of the metal defect detection device 10 according to a preferred embodiment of the present invention is provided with five infrared temperature sensors 40, these are all the circuit board 22 Are arranged in a row on the left end of the The sensor module 20 is installed to cover the sensor cover 44 around the light receiving element 42 for measuring temperature, and a sensor window 46 having a diameter of 2.5 mm is formed on the sensor cover 44. The diameter of the sensor window 46 is equal to the diameter of the light receiving element 42 so that infrared light from the workpiece is received (only the infrared light at the position corresponding to the light receiving element 42 by the sensor window 46). Light-receiving} to determine the temperature of the metal material. In addition, the infrared temperature sensor 40 used in the sensor module 20 of the defect detection apparatus 10 used in the present embodiment has a sensor window 46 measuring the temperature while the size of the light receiving element 42 is 8.2 mm. Since the diameter of 2.5mm is too much space between the actual measurement position, installed in the holder 50 to be positioned at an angle of 45 degrees to the workpiece 200 as shown in Figure 2 to reduce the measurement space It was. The difference in the horizontal position between the infrared temperature sensor 40 due to the tilting of the sensor module 20 was calculated in terms of the horizontal length during data analysis.

In addition, on the circuit board 22 of the sensor module 20 by connecting the power supply terminal 24, the sensor module 20 and the computer 90 (see Fig. 2) for power input from the outside to the sensor module 20 Signal terminal 26 for transmitting the output signal of the sensor module 20 to the computer 90, the variable resistor 28 for adjusting the reference output signal of the sensor module 20, the output of the sensor module 20 In order to amplify the signal, an amplifier 30 having a configuration as shown in FIG. 6 is provided.

7 is a test workpiece made of aluminum for testing a defect detection apparatus of a metal material using an infrared temperature sensor according to a preferred embodiment of the present invention, and FIG. 8 is a top and bottom end portions of the test workpiece made of aluminum of FIG. When the temperature is 92 degrees and 60 degrees, respectively, and FIG. 9 are graphs showing a result of measuring the workpiece of FIG. 7 using a defect detection apparatus of a metal material using an infrared temperature sensor according to a preferred embodiment of the present invention.

2 and 7 to 9, the present inventors test object 200 as shown in Figure 7 to test the detection capability of the defect detection apparatus 10 of the metal material according to a preferred embodiment of the present invention Was produced. The workpiece 20 of the sample aluminum material used in the performance test of the defect detection device 10 of the metal material of the present embodiment has a thickness of 10 mm, a slot 210 for artificial defects having a width of 15 mm and a height of 2.5 mm in the middle. And a thin aluminum sheet was covered on both sides of the slot 210 to hide the slot 210.

The operation of the metal defect detecting apparatus 10 according to the present embodiment is first performed by the heater 120 and the cooler attached to the upper and lower portions of the workpiece 200 of the aluminum flat plate having the artificial defect {slot 210}. Starting from operation 130). In this experiment, the heater 120 and the cooler 130 were operated for about 2 hours to obtain a steady state in which the temperature of the workpiece 200 had a constant temperature distribution. In this process, the temperature distribution in the workpiece 200 of the aluminum plate was measured by a mobile infrared thermometer.

Next, when the temperature distribution of the workpiece 200 is stabilized, the sensor module 20 detects a temperature deviation according to the distance of the workpiece 200 while moving the sensor module 20 with respect to the workpiece 200. In this embodiment, the motor 62 is operated to move the sensor module 20 horizontally at a speed of 3.3 cm / min. In addition, the measurement temperature of each infrared temperature sensor 40 and the position signal of the sensor module 20 are to be stored in the measuring computer 90 online. In the performance test of this embodiment, the distance between the surface of the infrared temperature sensor 40 and the workpiece 200 of the aluminum plate was 3 mm.

On the other hand, the performance test of the present embodiment was tested for two different temperature distribution.

8 is a defect detection of a metal material according to a preferred embodiment of the present invention when the temperature of the upper and lower ends of the workpiece 200 made of aluminum having an artificial defect (slot 210) is 92 ° C and 60 ° C, respectively. The measurement results with the apparatus 10 are shown. Numbers on the curves in this graph, as shown in Figure 4, indicates the position of the infrared temperature sensors 40 installed from the upper side on the left side of the sensor module 20. At this time, as shown in the graph, since the three infrared temperature sensors pass through the slot 210 of the hidden workpiece 200, the temperature decreases in the middle of the curve, while the curves of other numbers do not show the temperature decrease. It can be seen that. And since the left and right sides of the workpiece 200 are exposed to air, both ends of the curve show a sharp decrease in temperature. Therefore, the measurement of the infrared temperature sensor of 1 and 5 is affected by the heater 120 and the cooler 130 installed on the upper and lower portions of the workpiece 200, but this variation is different from the measured value of the infrared temperature sensor 3 It's a completely different aspect. In other words, the infrared temperature sensor 3 shows that the temperature drop is only in the defective part because of the defect in the center part. Therefore, if such a drop in temperature is observed in the actual measurement, it may be found to be defective.

9 is a metal defect according to a preferred embodiment of the present invention when the temperatures of the upper and lower ends of the workpiece 200 made of aluminum having an artificial defect {slot 210} are 125 ° C and 91 ° C, respectively. The measurement result by the detection apparatus 10 is shown. As a result, only the measured value of the infrared temperature sensor at position 3, as in the previous case where the temperature distribution of the workpiece 200 is low, shows a decrease in temperature at the center of the workpiece 200. In this case, a larger temperature deviation is obtained than in the previous performance experiments on the workpiece 200 having a low temperature distribution. This is because the heat loss to ambient air is greater than before because the temperature of the workpiece 200 is higher, and a larger temperature change is given throughout the workpiece 200. However, the temperature drop at the defects is observed the same.

As can be seen from the results of the experiment, the apparatus and method for detecting a defect of a metal material according to the present invention to which an infrared temperature sensor is applied, even if the temperature of the metal material has a slight variation, there is a unique temperature change at the position of the defect of the hidden metal material. It can be seen that the present invention can be sufficiently used for detecting a defect in a metal material, and thus can be sufficiently used as an apparatus using a heat graph defect detection technique.

Particularly in practical application, the temperature of the metal materials is sufficiently high that no external heating is required as in this embodiment. This can be seen that it is possible to reduce the time and economic costs of the existing non-destructive defect detection devices in the field application of the proposed metal defect detection device of the present invention.

As described above, a defect detection apparatus for a metal material according to a preferred embodiment of the present invention has been shown in accordance with the above description and drawings, but this is merely described, for example, and various changes without departing from the technical spirit of the present invention. And those skilled in the art will appreciate that changes are possible.

According to the defect detection apparatus and method of the metal material according to the present invention, the defect detection apparatus and method of the metal material according to the present invention can be configured at a lower cost than the infrared camera because it uses a sensor module having an infrared temperature sensor. Such a metal defect detection device has an advantage that it can be manufactured at low cost in detecting metal defects, and it solves the cost and time problems of other non-destructive defect detection devices, and thus, it is possible to detect metal defects in many process industries. Can be used. In particular, the defect detection device of a metal material according to the present invention solves a problem that the defect detection device of a conventional metal material has a lot of time and economic cost, and because it handles dangerous substances such as radioactive materials, there are many restrictions on the practical use in industrial applications. Because of the use of thermal graph defect detection technology, on-line measurement can be performed during the actual process, and it can be applied to many parts because it is not accompanied by process shutdown.

Claims (5)

In the defect detection apparatus of a metal material for detecting a defect of a workpiece such as a metal material and a structure using a thermal graph, A sensor module installed with a plurality of infrared temperature sensors for detecting a temperature radiated from the workpiece and generating the electrical signal; An actuator unit coupled to the sensor module for varying the position of the sensor module relative to the workpiece and generating the displacement as an electrical signal; A computer having a built-in program connected to the sensor module and the actuator unit to receive and convert the electric signals generated by the sensor module and the actuator unit into a thermal graph; The sensor module is a circuit board that is electrically connected to the plurality of infrared temperature sensors are installed so as to be located in succession in parallel on one side; A variable resistor electrically connected to the circuit board and installed to control outputs of the plurality of infrared temperature sensors; An amplifier electrically connected to the circuit board for amplifying the electrical signal, Each of the plurality of infrared temperature sensors is installed to surround a light receiving element for measuring a temperature, and a defect detection device of a metal material, characterized in that it has a cover formed with a sensor window having the same size as the diameter of the light receiving element on the top . delete delete delete delete

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