JP2006046952A - Vacancy inspection method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacancy inspection method and a device capable of inspecting simply the existence of a defect inside a vacancy. <P>SOLUTION: Wind is sent at constant speed into an inlet 14a from a blower 16 connected to the inlet 14a of the vacancy 14 of an inspection object 12. Detection values of the wind speed at each position detected by a wind speed sensor 22 disposed on the outlet 14b side of the vacancy 14 are input into a comparison operation device 34 through an amplifier 30 and an A/D converter 32. The comparison operation device 34 compares a reference value of the wind speed acquired by inspection of a nondefective product and stored beforehand in a storage device 36 with a detection value of the wind speed acquired by inspection of the inspection object 12, and determines that a defect does not exist if both values are approximately same, and also determines that a defect exists inside the vacancy 14 if the reference value is different from the detection value. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hole inspection method and apparatus for inspecting a defect inside a hole in an article such as a casting having holes.

For example, articles having pores, such as intake / exhaust manifolds for automobiles, especially cast products, have defects such as blockages, constrictions, burrs, etc., in the interior of the pores. It is necessary to inspect for the presence or absence of the defect. If the holes are linear, visual inspection is possible, but visual inspection is difficult in the case of complex shapes that are bent halfway. Therefore, light or sound waves are incident from one opening in the hole, and the amount of light or volume emitted from the other opening is detected to determine the presence or absence of defects, or the amount of transmitted infrared rays from the inside of the tube An inspection method has been proposed in which the presence or absence of a defect is determined by detection with an external infrared detector (see, for example, Patent Document 1).
JP-A-61-120950

  However, when using light or sound waves, the amount of light is greatly attenuated and the sound volume is greatly reduced if the holes are in a complicated state. Sometimes it can't be done. Moreover, in the method of detecting the amount of transmitted infrared rays, since it is necessary to inspect the entire length of the holes, it is pointed out that it takes time.

  That is, the present invention has been proposed in view of the above-described problems related to the prior art, and is preferably proposed to solve this problem, and it is possible to easily inspect the presence / absence of defects inside the holes. And an object to provide an apparatus.

In order to overcome the above-mentioned problems and to achieve the intended purpose suitably, the hole inspection method according to the present invention comprises:
A method for inspecting holes in an article having holes,
Sending a constant wind from one opening in the hole of the article,
Information on the wind blown from the other opening in the hole is detected by the detection means,
The detection value of the information detected by the detection means is compared with a reference value serving as a determination reference, thereby determining the presence / absence of a defect inside the hole.

In order to overcome the above-mentioned problems and achieve the desired purpose suitably, the hole inspection method according to another invention of the present application is:
A method for inspecting holes in an article having holes,
Inhale a constant wind from one opening in the hole of the article,
Information on the wind sucked from the one opening of the hole is detected by detection means,
The detection value of the information detected by the detection means is compared with a reference value serving as a determination reference, thereby determining the presence / absence of a defect inside the hole.

In order to overcome the above-mentioned problems and achieve the desired object suitably, a hole inspection device according to another invention of the present application is:
A hole inspection device for an article having holes,
A blowing means for sending a constant air into the hole from one opening in the hole of the article;
Detecting means for detecting information relating to the wind blown from the other opening, which is disposed in proximity to the other opening in the hole;
The detection value of the information detected by the detection means is compared with a reference value stored in advance, and comprises comparison determination means for determining the presence or absence of a defect.

In order to overcome the above-mentioned problems and achieve the desired object suitably, a hole inspection apparatus according to still another invention of the present application is:
A hole inspection device for an article having holes,
A suction means for sucking a constant wind into the hole from one opening in the hole of the article;
A detecting means that is disposed in proximity to the one opening of the air hole and detects information about the wind sucked from the one opening;
The detection value of the information detected by the detection means is compared with a reference value stored in advance, and comprises comparison determination means for determining the presence or absence of a defect.

  According to the hole inspection method and apparatus according to the present invention, it is possible to inspect for the presence or absence of defects inside the holes in a short time with a simple configuration. Also, information relating to wind blown from one opening and blown from the other opening, or information relating to wind sucked from one opening, may be detected by a detection means or detected by a plurality of detection means. By doing so, inspection accuracy can be improved.

  Next, a void inspection method and apparatus according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments.

  FIG. 1 shows a hole inspection apparatus according to a first embodiment. The hole inspection apparatus 10 includes one of holes 14 provided in a casting product (article) 12 such as a manifold to be inspected. A blower (blower means) 16 is connected to communicate with an opening 14a (hereinafter referred to as an inlet) 14a and sends a constant wind. The blower 16 is rotationally controlled by an integrated control device 18 such as a personal computer through the controller 20 so as to have a constant rotational speed, and is configured to send wind into the air holes at a constant speed. Further, a wind speed sensor 22 as a detecting means is disposed in close proximity to the other opening (hereinafter referred to as an outlet) 14b of the hole 14, and detects the wind speed as information of the wind blown from the outlet 14b. To get. The wind speed sensor 22 is disposed in the moving device 24 so as to be movable in the XY direction across the wind blown from the outlet 14b, and position information detected by an encoder 26 connected to the moving device 24 is position control. It is configured to be input to the means 28. And the said integrated control apparatus 18 scans the said wind speed sensor 22 in the direction crossing the wind blown off from the exit 14b by operating-controlling the moving apparatus 24 via the position control means 28 (refer FIG. 2). ), It is possible to detect the distribution of the wind speed that varies depending on different positions.

  As the wind speed sensor 22, for example, as shown in FIG. 3, a wind speed detection thermistor 22a and a temperature compensation thermistor 22b are preferably used. The wind speed detection thermistor 22a is connected to the automatic balancing bridge circuit, and is configured to be self-heated to a predetermined temperature (for example, about 150 ° C.) by energization. When the wind falls on the wind speed detection thermistor 22a, In addition, the wind speed is detected by taking out the voltage deviation applied to return to the original temperature as the wind speed signal. The temperature compensation thermistor 22b is configured to detect the air temperature without self-heating, and can compensate for changes in the air temperature by performing temperature compensation of the wind speed signal on the circuit in accordance with the detected temperature. is there.

  The detected value (signal) of the wind speed detected by the wind speed sensor 22 is input to the comparison operation device (comparison determination means) 34 via the amplifier 30 and the A / D converter 32 as shown in FIG. It has become. The integrated control device 18 also includes a storage device 36 for storing reference value data for determining whether the detected value of the wind speed sensor 22 is good or bad. The detected value is compared with a reference value stored in advance in the storage device 36 to determine the presence or absence of a defect in the hole 14. The reference value is a wind speed distribution value actually detected using a non-defective product having the same shape as the casting 12 to be inspected and having no defects inside the holes.

[Operation of Example 1]
Next, the operation of the hole inspection apparatus according to the first embodiment will be described in relation to the hole inspection method. Prior to inspecting the casting 12, the reference value is obtained and stored in the storage device 36. That is, a non-defective product having the same shape as the cast product 12 to be inspected (hereinafter referred to as an inspection product in the description of the operation) 12 and having no defects inside the holes 14 is the same as in the case of inspecting the inspection product 12. It is set in the air hole inspection device 10 and wind at a constant speed is sent from the blower 16 through the inlet 14a of the air hole 14, and the air speed sensor 22 disposed on the outlet side is scanned in the XY direction. And the detected value of the wind speed of each position detected by the wind speed sensor 22 is memorize | stored in the said memory | storage device 36 as a reference value. In the case of a non-defective product, the wind speed distribution at the exit 14b is the fastest at the exit center and slows toward the left and right as shown in FIG. That is, the distribution is mountain-shaped with the center at the top. The data shown in FIG. 4 is obtained when the wind speed sensor 22 is scanned only in the X direction (left-right direction) at a substantially central portion in the vertical direction at the outlet 14b, as shown in FIG.

  Next, the inspection target product 12 is inspected. That is, wind is sent from the blower 16 connected to the inlet 14a of the hole 14 in the inspection target product 12 to the inlet 14a at a constant speed. Further, the wind speed sensor 22 with the wind speed detection thermistor 22a and the temperature compensation thermistor 22b facing the position where the wind from the outlet 14b of the hole 14 contacts is scanned in the XY direction by controlling the movement of the moving device 24 ( (Scanning only in the X direction as in the case of obtaining the reference value). The wind sent into the hole 14 flows while contacting the inner wall surface of the hole 14, and is blown out from the outlet 14b. At this time, the wind blown from the outlet 14b is cooled by coming into contact with the wind speed detection thermistor 22a of the wind speed sensor 22, and the wind speed signal (detection value) is obtained from the voltage deviation applied to keep the temperature of the thermistor 22a constant. This signal is input to the comparison arithmetic unit 34 via the amplifier 30 and the A / D converter 32.

  In the comparison calculation device 34, the reference value of the wind speed inspected with the non-defective product stored in the storage device 36 in advance is compared with the detected value of the wind speed inspected with the inspection target product 12, and if both are substantially the same. Judge that there are no defects. However, if the reference value and the detected value are different, it is determined that there is a defect inside the hole 14. For example, when there is a defect in the left part of the hole 14, the wind speed distribution at the outlet 14b is as shown in FIG. 4 where the wind speed is slower on the left side than the center of the exit where the defect exists, and the fastest top is from the center. Yamagata is shifted to the right. The maximum wind speed is also faster than the reference value. On the other hand, when there is a defect in the right part of the hole 14, the wind speed distribution at the outlet 14b is as shown in FIG. Is a Yamagata that has shifted from the center to the left. The maximum wind speed is also faster than the reference value. As described above, when there is a defect inside the hole 14, a difference is generated between the reference value and the detected value, so that the presence or absence of the defect can be reliably determined. That is, unless the wind leaks from the middle of the hole 14 to the outside, the amount does not change greatly from the inlet 14a to the outlet 14b like light and sound waves, so the determination of the presence or absence of defects is simple and reliable. You can do it. Moreover, since only the velocity of the wind blown from the outlet 14b is detected, the inspection can be completed in a short time. Further, since the wind speed sensor 22 is scanned to detect the wind speed distribution at each position of the outlet 14b, an accurate inspection is achieved.

[Modification of Example 1]
In the first embodiment, the case where a single wind speed sensor is scanned has been described. However, a plurality of wind speed sensors may be configured to scan in the X direction, the Y direction, or the XY direction at different positions. . Alternatively, one wind speed sensor can be swirled with respect to the outlet. Further, the information on the wind blown out from the outlet is not limited to the wind speed, but may be the air volume or the wind pressure, and the detection means capable of detecting the air volume or the wind pressure may be scanned. It is possible to adopt a configuration in which a straight pipe is provided between the inlet of the hole and the blower so that a stable wind is blown from the inlet. As the air blowing means, various devices such as a fan motor and a blower can be used.

  Further, the article to be inspected is not limited to a cast product, and may be formed by other forming methods such as an object formed of SUS sheet metal or the like, and has pores. Any one can be used. Further, the number of holes is not limited to one, and a plurality of holes may be used, or holes may be branched in an octopus foot inside the article like an exhaust manifold.

  FIG. 5 shows a hole inspection apparatus according to the second embodiment, and its basic configuration is the same as that of the first embodiment, but is different in that it does not scan the wind speed sensor. Only explained. The same members as those in the first embodiment are denoted by the same reference numerals.

  That is, in the hole inspection device 40 according to the second embodiment, as shown in FIG. 6, the wind speed sensors 22 are fixedly arranged at two locations that are close to the outlet 14 b of the casting 12 to be inspected and spaced apart from each other. Is done. Each wind speed sensor 22 is the same as that described in the first embodiment, and the wind speed detection thermistor 22a is positioned so that the wind comes into contact with the substantially central portion in the vertical direction of the outlet 14b. Then, the detected value (signal) of the wind speed detected by each wind speed sensor 22 is input to the comparison operation device 34 via the amplifier 30 and the A / D converter 32 as shown in FIG. In comparison with the reference value, the presence or absence of a defect is determined.

[Operation of Example 2]
Next, the operation of the hole inspection apparatus according to the second embodiment will be described in relation to the hole inspection method. Prior to inspecting the casting 12, the reference value is obtained and stored in the storage device 36. That is, a non-defective product having the same shape as the cast product 12 to be inspected (hereinafter referred to as an inspection product in the description of the operation) 12 and having no defects inside the holes 14 is the same as in the case of inspecting the inspection product 12. It is set in the hole inspection device 40, wind at a constant speed is sent from the blower 16 through the inlet 14 a of the hole 14, and the detected value of the wind speed at each position detected by each wind speed sensor 22 is stored in the storage device 36 as a reference. Store as a value. In the case of a non-defective product, the wind speed distribution at the outlet 14b is substantially the same on the left and right of the outlet 14b as shown in FIG.

  Next, the inspection target product 12 is inspected. That is, by sending wind at a constant speed from the blower 16 connected to the inlet 14a of the hole 14 in the inspection object 12, the detected value of the wind speed at each position detected by each wind speed sensor 22 becomes the amplifier. 30 and the A / D converter 32 to be input to the comparison operation unit 34, respectively. In the comparison operation device 34, the reference value of the wind speed inspected with the non-defective product stored in the storage device 36 in advance is compared with the detected value of the wind speed inspected with the inspection object product 12, and if both are substantially the same, the defect Is determined not to exist. However, if the reference value and the detected value are different, it is determined that there is a defect inside the hole 14. For example, when there is a defect in the left part of the hole 14, the wind speed distribution at the outlet 14b is slower on the left side than the center of the outlet where the defect exists, and faster on the right side as shown in FIG. On the other hand, if there is a defect in the right part of the hole 14, the wind speed distribution at the outlet 14b is slower on the right side than the center of the outlet where the defect exists, and faster on the left side as shown in FIG. Become. As described above, when there is a defect inside the hole 14, a difference is generated between the reference value and the detected value, so that the presence or absence of the defect can be reliably determined.

  For example, if there are similar defects in the left and right sides of the hole 14, the left and right wind speeds may be substantially the same. The presence or absence of can be determined with certainty. In the case of the second embodiment, the same effects as those of the first embodiment are obtained.

[Modification of Example 2]
In the second embodiment, the case where two wind speed sensors are arranged has been described, but the number thereof may be three or more, and the arrangement location thereof may be arbitrarily set. Moreover, the same modified example as the modified example of the first embodiment can be adopted.

[Another Example]
In the first and second embodiments described above, information on the wind blown from the outlet 14b of the hole 14 is detected to determine whether there is a defect. However, information on the wind sucked from the inlet 14a of the hole 14 is detected. Then, the presence or absence of a defect may be determined. That is, in the hole inspection device 42 according to another embodiment shown in FIG. 8, the suction machine (suction means) 44 is connected to the outlet 14 b of the hole 14 in the casting 12, and the suction machine 44 is connected via the controller 20. It is controlled by the integrated control device 18 so that the wind is sucked into the hole from the inlet 14a at a constant wind speed. Further, similarly to the first embodiment, a wind speed sensor 22 movable in the XY directions is disposed in the vicinity of the inlet 14a of the hole 14 so as to detect the speed of the wind sucked into the hole from the inlet 14a. Configure.

  That is, when there is a defect inside the hole 14, as described in the first and second embodiments, the wind blown from the outlet 14b is affected, but the wind sucked from the inlet 14a is also affected. Therefore, by detecting the speed (information) of the wind sucked from the inlet 14a as in another embodiment, the presence or absence of a defect can be reliably determined as in the first and second embodiments. In addition, since it is the same as that of Example 1 about another structure, the same code | symbol is attached | subjected and shown to the same member. As the suction device 44, various means such as a fan motor and a blower can be used. If the fan motor or blower is used, the suction side may be connected to the outlet 14b.

  In addition, the structure of Example 2 is employable as an arrangement structure of the wind speed sensor in another Example. Various modifications described above with respect to the first and second embodiments can be appropriately employed in the other embodiments.

1 is a schematic configuration diagram of a hole inspection device according to Embodiment 1. FIG. It is explanatory drawing which shows the relationship between the wind speed sensor of Example 1, and a hole exit. It is the schematic which shows the wind speed sensor of Example 1. FIG. It is a graph which shows the data of the wind speed distribution test | inspected with the hole inspection apparatus of Example 1. FIG. It is a schematic block diagram of the hole inspection apparatus which concerns on Example 2. FIG. It is explanatory drawing which shows the relationship between the wind speed sensor of Example 2, and a hole exit. It is a graph which shows the data of the wind speed distribution test | inspected with the hole inspection apparatus of Example 2. FIG. It is a schematic block diagram of the hole inspection apparatus which concerns on another Example.

Explanation of symbols

12 castings (articles), 14 holes, 14a inlet (one opening)
14b outlet (the other opening), 16 air blower (air blowing means), 22 wind speed sensor (detection means)
34 comparison arithmetic unit (comparison judgment means), 44 suction machine (suction means)

Claims (7)

A method for inspecting holes in an article (12) having holes (14), comprising:
A constant wind is sent from one opening (14a) in the hole (14) of the article (12),
Information on the wind blown from the other opening (14b) in the hole (14) is detected by the detection means (22),
A hole inspection method characterized in that the presence or absence of a defect inside a hole is determined by comparing a detection value of information detected by the detection means (22) with a reference value serving as a determination reference. .   The detection means (22) is scanned in a direction across the wind blown from the other opening (14b) to detect the distribution of information that changes depending on the position of the other opening (14b). The hole inspection method according to claim 1.   A plurality of the detection means (22) are arranged at different positions in the vicinity of the other opening (14b), and the information distribution varies depending on the position of the other opening (14b) from the detection means (22). The hole inspection method according to claim 1, wherein: A method for inspecting holes in an article (12) having holes (14), comprising:
A constant wind is sucked from one opening (14a) in the hole (14) of the article (12),
Information on the wind sucked from the one opening (14a) of the hole (14) is detected by the detection means (22),
A hole inspection method characterized in that the presence or absence of a defect inside a hole is determined by comparing a detection value of information detected by the detection means (22) with a reference value serving as a determination reference. .   The hole inspection method according to claim 1, wherein the information is any one of a wind speed, an air volume, and a wind pressure. A hole inspection device for an article (12) having a hole (14),
Blowing means (16) for sending a constant air into the hole from one opening (14a) in the hole (14) of the article (12),
Detection means (22) that is disposed in proximity to the other opening (14b) in the hole (14) and detects information about the wind blown from the other opening (14b),
A hole inspection characterized by comprising a comparison judgment means (34) for judging the presence or absence of a defect by comparing the detected value of the information detected by the detection means (22) with a reference value stored in advance. apparatus. A hole inspection device for an article (12) having a hole (14),
A suction means (44) for sucking a constant wind into the hole from one opening (14a) in the hole (14) of the article (12);
Detection means (22) that is disposed in proximity to the one opening (14a) of the hole (14) and detects information about the wind sucked from the one opening (14a),
A hole inspection characterized by comprising a comparison judgment means (34) for judging the presence or absence of a defect by comparing the detected value of the information detected by the detection means (22) with a reference value stored in advance. apparatus.

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