JP2000162097A - Method and apparatus for inspection of molding defective hole in casting molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus, for the inspection of a molding defective hole in a casting molded product, in which the blockade degree of a complicated flow passage can be inspected. SOLUTION: In this method, air is sent out into a flow passage from a node opening J in a nonlinear flow passage R which is formed at the inside of a casting molded product, and an air flow which flows out from a node opening J which is adjacent in the air sending-out direction of the flow passage R is detected by a wind velocity sensor 5. Alternatively, an air nozzle 4a in an air supply tube 3 is faced, via a longitudinal hole S, with one or a plurality of node openings J in a plurality of nonlinear flow passages R which are formed at the inside of the casting molded product. In addition, a wind velocity sensor 5 which detects an air flow from one or a plurality of node openings J in one or a plurality of flow passages R is installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for inspecting a molded article for defective molding holes for inspecting the degree of blockage of a non-linear flow path formed in a molded article. Things.

[0002]

2. Description of the Related Art Water holes for cooling water need to be formed inside cast moldings such as cylinder blocks and cylinder heads of automobiles. This water hole is obtained by disposing a core in a mold, but when the core is broken or collapsed due to heat or molten metal flow during casting and the water hole is closed or narrowed, cooling is performed. Since it may cause defects, reduce engine efficiency or cause burning,
All products had to be inspected for water hole molding defects.
However, apart from the water holes that can be visually confirmed, the water holes that are complicatedly stretched inside the cast molded product are tortuous, so that light is manually irradiated from the opening of the flow path and the reflected light passing therethrough is observed. In addition to judging pass / fail, and judging pass / fail of the flow passage through a wire or the like, it is also performed to judge pass / fail of a complicated flow passage by using a light source of an endoscope that can bend its tip. However, there is a problem that the operation is complicated and all of them have to rely on manual labor. Therefore, development of an apparatus that can be automated has been demanded. Therefore, light emitted from the opening into the flow path can be detected by an optical sensor arranged in the adjacent opening, or air can be supplied from the opening into the flow path and the air pressure or air flow rate at the adjacent opening can be detected by the sensor. Although a detection device may be considered, since the inside of the flow path is discolored or has a rough surface, the passing light is attenuated to 1/1000 or less and is not at a level at which the quality can be determined. Since the air leaks from the diverging point, it is attenuated to 1/1000 or less at the branch point, and it is not at a level at which the quality can be judged, and it has been extremely difficult to practically use any of them. Accordingly, the present applicant has developed a clogging measuring device of Japanese Patent Publication No. 7-76694 in cooperation with SMC Corporation and has attempted to automate the inspection, but cannot be applied to an inspection in a flow path that is complicated and has many branches. There was a problem.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and an apparatus for inspecting defective molding holes in a cast molded article, which can inspect the degree of blockage of a complicated flow path.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is to provide a non-linear flow passage formed inside a cast product by sending air into the flow passage from a node opening of the flow passage. The method of inspecting defective molding holes of a cast product by detecting an air flow flowing out from a node opening adjacent to the air sending direction by a wind speed sensor according to the present invention, wherein the method is introduced into a wide space according to the present invention. The invention of claim 2 is a method for inspecting a defective molding hole in a cast product, which performs detection based on an averaged air flow. In the invention of claim 1 or 2, the casting method performs detection based on a cooled air flow. The method for inspecting a defective molding hole of a product is the invention according to claim 3, wherein an air nozzle of an air supply cylinder is vertically inserted into one or a plurality of node openings of one or more non-linear flow paths formed inside the cast molded product. And the one or the other The invention of claim 4 is a device for inspecting a defective molding hole of a cast product provided with a wind speed sensor for detecting an air flow from one or a plurality of adjacent node openings of the number of flow paths. The invention of claim 5 is an apparatus for inspecting defective casting holes in a casting, wherein the sensor directly detects the air flow from the node opening. In the invention of claim 4 or 5, the air flow from the air nozzle is introduced into the space. An apparatus for inspecting a defective molding hole of a casting, which detects an air flow in the space by introducing the air flow in the space into the wind speed sensor, according to any one of claims 4 to 6, wherein The invention according to claim 7, wherein an apparatus for inspecting a defective molding hole of a casting, wherein an air flow is introduced into a cooler, and an air flow passing through the cooler is introduced into a wind speed sensor to detect the air flow. In such invention, the air supply cylinder An apparatus for inspecting a defective molding hole in a cast molded product in which the nozzle can be swiveled is the invention according to claim 8. In any one of the inventions according to claims 4 to 8, the air nozzle is projected so as to be close to the node opening of the flow path. An apparatus for inspecting a defective casting hole of a cast molded product is the invention according to claim 9.

[0005]

FIG. 1 shows a first preferred embodiment of the present invention for inspecting water holes in a cylinder head.
This will be described in detail based on a few items. Reference numeral 1 denotes a measuring jig mounted on the cylinder head B. The measuring jig 1 is positioned and fixed by inserting a positioning pin 2 into a hole H formed in the cylinder head B. Numeral 3 denotes an air supply cylinder which makes the height of the air nozzle 4a freely adjustable and turns freely on the measuring jig 1. The air supply cylinder 3 is erected through a vertical hole S of a node opening J of the flow path R. A thicker nozzle body 4 having an air nozzle 4a formed thereon is connected to its forward end. By making the nozzle body 4 thick, the directivity of the air jetted from the air nozzle 4a can be increased, and the detection accuracy can be improved. Reference numeral 5 denotes a height-adjustable wind speed sensor attached to the measuring jig 1. The wind speed sensor 5 is disposed in the vertical hole S of the node opening J adjacent to the air supply direction of the air supply cylinder 3 in the flow path R. The sensor portion is a platinum resistance wire through which a weak current flows. When the platinum resistance wire that generates heat receives a wind from the air supply tube 3 and a temperature drop occurs, the resistance change due to the temperature drop causes the wind speed to change. Is to be detected.

As shown in FIG. 3, an air circuit for supplying air to the air supply cylinder 3 includes a tank 10 for storing air obtained by a compressor or the like, a filter 11 for removing moisture in the air, and a pressure circuit. A regulator 12 with a pressure gauge for adjusting the pressure, an on / off valve 13 for turning on and off the air, and a speed controller 14 for controlling the amount of air to be blown out. The air nozzle diameter can be changed according to the length.

[0007] In such a construction, a cylinder head S is mounted on an inspection table, and positioning pins 2 are formed on the upper surface of the cylinder head S by holes in the cylinder head S as shown in FIG. H, and the measurement jig 1 is positioned and fixed by positioning the air supply cylinder 3 and the wind speed sensor 5 in each vertical hole S of each node opening J of the flow path R to be inspected. Next, the height of the air nozzle 4a of the air supply cylinder 3 shown in FIG. 1 is adjusted so as to be the same height as the nodal opening J of the flow path R, and the wind speed sensor 5 is positioned at the air outlet of the nodal opening J. Perform height adjustment. At this time, since the cylindrical wall W of the cylinder head S is formed in the nodal opening J of the flow path R in which the wind speed sensor 5 is arranged, the air flowing downward and hitting the cylindrical wall W is detected. The wind speed sensor 5 is arranged below the cylindrical wall W. Thus, the air supply cylinder 3 and the wind speed sensor 5
When the on-off valve 13 of the air circuit is opened after positioning the air, the air stored in the tank 10 is filtered by the filter 1.
After the water is removed through the air nozzle 1, the pressure is made constant by the regulator 12, and the air is sent from the air nozzle 4 a through the speed controller 14 which controls the air ejection amount set according to the air nozzle diameter of the air supply cylinder 3. It will erupt.

[0008] The air supply cylinder 3 is swirled while ejecting air from the air nozzle 4a.
When a is located at the center of the nodal opening J of the flow path R, the air flow enters one of the arcuate paths, passes through the arcuate path, hits the cylindrical wall W, flows downward, and flows out from the lower opening. . This outflow is blown to the sensor portion of the wind speed sensor 5 to cool the platinum wire that is generating heat, thereby detecting the wind speed. The wind speed at this time depends on the degree of closure (opening ratio) of the arcuate road. If there is no clogging or stenosis exceeding the allowable level, the wind speed exceeds the threshold value and the arcuate road has no abnormalities. If there is a clogging or a stenosis exceeding an allowable level in the arcuate path, the wind speed does not exceed the threshold value, so that the defective product is determined to be abnormal. Then, with the rotation of the air supply cylinder 3 that continues to turn, the direction of the air nozzle 4a of the nozzle body 4 deviates from the center of the opening of the arcuate path.

As shown in the graph of FIG. 7, the air flow ejected from the air nozzle 4a has a characteristic that it has a sharp directivity and rapidly attenuates except in a narrow range of the central region.
When the air flow deviates from the center of the opening of the flow path R, the flow path R
The air flow flowing through the air nozzle 4a
Does not detect the threshold wind speed by the wind speed sensor 5 due to the air flow ejected from the air nozzle 4a when is shifted from the center of the opening. Then, when the air supply cylinder 3 turns and the air nozzle 4a is positioned at the center of the opening of the other arcuate path, the sharply directional airflow passes through the arcuate path and hits the cylindrical wall W to form a downward flow. It will go to the wind speed sensor 5. At this time, if there is no clogging or stenosis exceeding the allowable level in the arcuate road, the wind speed sensor 5 detects a wind speed exceeding the threshold, and thus determines that the degree of blockage does not exceed the reference level. However, if there is a clogging or a stenosis exceeding the allowable level in the arcuate path, the wind speed sensor 5 does not detect the wind speed reaching the threshold value, so that it is determined that the degree of obstruction exceeds the reference level. As described above, if the wind speed having two peaks (corresponding to two arcuate roads) as shown in the graph of FIG. When the inspection of the flow path R in the right half of the cylinder head S has been completed in this way, the measuring jig 1 is moved to the left half, and the same inspection as described above is performed. Will be sent to the machining process. Next, a description will be given of a simulation experiment performed to confirm how the wind speed changes according to the degree of blockage of the arcuate road. First, as shown by a chain line in FIGS. 1 and 2, the wind speed when the insertion position (displacement) of the shut-off valve 30 is changed while the air is sent from the air nozzle 4a while the shut-off valve 30 is interposed in the arcuate path. Is shown in FIG. (A) of FIG.
Is the case where the air pressure is 1.5 kgf / cm ^2, and (b)
Is a case where the air pressure is 1.5 kgf / cm ^2, and it can be seen that the wind speed changes continuously by the movement (displacement) of the shut-off valve 30. It can be seen that there is a clear correlation.

In the preferred embodiment, the air supply tube 3 is swirled to emit air to inspect each of the continuously branched arcuate paths, but the air nozzle 4a of the air supply tube 3 is connected to each node. The opening J may be stopped at each opening center of each arcuate path, and air may be ejected intermittently. In this case, it is difficult to accurately position the air nozzle 4a at the opening center of each arcuate path. If the air is ejected while turning the air nozzle 4a within the range of the opening of each arcuate path, it is possible to inspect a molding defect in the arcuate path without accurately controlling the positioning of the air supply cylinder 3. Or,
The angle of the air nozzle 4a may be fixed so as to coincide with the center of the arcuate path of the node opening J. In this case,
When there are a plurality of arcuate paths in the nodal opening J and the air nozzles 4a must be positioned at the centers of the plurality of openings, a plurality of air nozzles 4a are formed in the nozzle body 4 of the air supply cylinder 3 or other air nozzles described later. In the case of the air supply cylinder 3, it is necessary to form a plurality of protruding air nozzles 4a. Also,
In the preferred embodiment, the flow path R is connected to the left and right node openings J.
Is an arcuate path connected by two arcuate paths.
May be connected by a single arcuate path, or
Of course, many node openings J may be connected by one or more arcuate paths. Further, in the above-described preferred embodiment, the water hole of the cylinder head is inspected. However, the present invention can be used for inspection of a cylinder block and other castings having holes formed therein.

In another embodiment of the air supply cylinder 3 shown in FIGS. 4 and 5, a cylindrical air nozzle 4a is protruded from the air supply cylinder 3 so that the air supply cylinder 3 can be approached to the node opening J of the flow path R. In addition to this, the directivity of the air flow is further increased to ensure that highly directional air is sent into the flow path R and the detection accuracy is improved, and such a protruding air nozzle 4a is used. As shown in the graph of FIG. 9, the detection accuracy when two peaks are clearly wider than the graph of FIG. 8 is detected, so that a reliable inspection can be performed without a detection error. However, even when the directivity of the air flow is increased, the air flow needs to fill the cross section of the flow path and pass through. This means that, depending on the distance from the air nozzle 4a to the entrance of the flow path R, the air flow ejected from the air nozzle 4a with a spread of about 5 to 7 degrees does not flow completely through the flow path cross section, or a part of the air flow. If the air does not flow into the flow path R, the detection accuracy is reduced. Therefore, in the case of a standard distance from the vertical hole S of the cylinder head to the flow path R, the diameter of the air nozzle 4a is reduced to １ ／ of the cross section of the flow path. ~ 1 /
5 is assumed. Further, it is preferable in terms of detection accuracy that the diameter of the air nozzle 4a is also circular, square, or elongated depending on the shape of the cross section of the flow path (circle, corner, or elongated).

Further, in another embodiment of the measuring jig 1 shown in FIG. 6, the air supply cylinders 3 and the wind speed sensors 5 corresponding to all the flow path R positions to be inspected are arranged and all the flow rates are measured. The inspection of the road R is performed at the same time, thereby greatly reducing the inspection time and increasing the inspection efficiency. In this case, the detection data of each wind speed sensor 5 is input to a determination circuit of a computer to make an automatic determination. Is preferred.

Next, a second preferred embodiment of the present invention will be described with reference to FIG. 11, but the same components as those in the first preferred embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only the configuration will be described in detail. Reference numeral 20 denotes a holder fitted in the vertical hole S. The holder 20 is formed of a cylindrical body having a flanged plug portion 20a formed at the end thereof to be fitted and locked in the hole of the vertical hole S. The case 5a of the wind speed sensor 5 is fitted in the center hole 20b of the motor 20. Then, by fitting the holder 20 into the vertical hole S, a somewhat wide space P is formed between the vertical hole S and the node opening J to introduce an air flow to reduce the speed. Reference numeral 5b denotes a long window formed in the forward portion of the case 5a. The upper end of the long window 5b is exposed to the outside from the cylindrical body of the holder 20, and the air flow flowing into the case 5a generates a back pressure. Without being discharged outside. Reference numeral 21 denotes a temperature compensator.
Incorporates a thermistor for temperature detection, and uses the characteristics of a thermistor whose resistance changes according to temperature to correct the detection value of the wind speed sensor 5 according to the temperature of the air flow detected. Is increasing.

With the above-described structure, the air nozzle 4a for blowing air from the air supply cylinder 3 is located at the center of the node opening J of the flow path R, as in the first preferred embodiment. At this time, the air flow enters from one of the arcuate paths, passes through the arcuate path, hits the cylindrical wall W, forms a downward flow, and is introduced into the slightly wider space P formed below the vertical hole S. By flowing into the space P, the velocity of the air flow is reduced and the air flow becomes an averaged air flow. For this reason, even if the air flow is accelerated or the direction of the air flow changes due to the constriction in the flow path R, the measurement is performed based on the averaged air flow, so that an accurate wind speed can be detected. At this time, part of the air flow flows out of the flow path R in the next stage, but most of the air flow flows into the case 5a of the wind speed sensor 5 attached to the holder 20 fitted in the vertical hole S. Thus, the averaged wind speed is blown to the sensor section in the case 5a. The platinum resistance wire that is generating heat by the air flow is cooled, and the resistance of the platinum resistance wire changes due to the cooling, and the wind speed based on the changed resistance is detected.

By introducing the air flow averaged in the space P into the wind speed sensor 5 as described above, the air flow flowing out from the node opening J is measured by the wind speed sensor 5 as in the first preferred embodiment. Then, the direction of the air flow changes depending on the state of the stenosis in the flow path R, or the air flow is narrowed and accelerated by the stenosis, and the accelerated air flow is detected.
While it is not possible to obtain a wind speed that matches the degree of blockage (opening ratio) in the inside, it is possible to obtain a wind speed that matches the degree of blockage (opening ratio). Then, the wind speed measured based on the averaged air flow is corrected based on the temperature of the air flow detected by the thermistor of the temperature compensator 21 and becomes more accurate. Since the degree of blockage (opening ratio) is obtained based on the wind speed measured in this way, clogging and narrowing of the flow path R can be detected. If there is no blockage in the flow path R and no narrowing exceeding the allowable level, it is determined to be a non-defective product. However, if there is a stenosis (including clogging) exceeding an allowable level (threshold), it is excluded as a defective product.

Next, a third preferred embodiment of the present invention will be described with reference to FIG. 12. The same components as those in the first preferred embodiment are denoted by the same reference numerals, and description thereof is omitted. Only the details will be described. Reference numeral 20 denotes a holder fitted in the vertical hole S, as in the second preferred embodiment. The holder 20 has a plug-in portion 20a with a flange fitted and locked in the hole of the vertical hole S at the tip. It consists of a formed cylinder. And
By fitting the holder 20 in the vertical hole S, a somewhat wide space P is formed between the vertical hole S and the node opening J to introduce an air flow to reduce the speed. The center hole 2 of the holder 20
A cooler 22 made of copper or aluminum having good heat conductivity is fitted and connected to 0b. The cooler 22 is helically extended to lower the temperature of the inflowing air flow to around room temperature, and the base end of the cooler 22 is connected to the case 5 a of the wind speed sensor 5 via the joint 23. I have.

The reason for lowering the temperature to around room temperature by the cooler 22 is that the cast product is heated to remove the core sand, and after the core sand is removed, the product is cooled naturally. Inspection of defective molding holes is performed, but if the cooling is not performed sufficiently, the temperature of the air flow is too high to accurately detect the wind speed. This is because the heat generated platinum resistance wire of the wind speed sensor 5 receives the wind to cause a temperature drop, and the wind speed is detected from the resistance change due to the temperature drop. Therefore, if the temperature of the air flow is different, the wind speed is the same. This is because the degree of temperature decrease is different. For this reason, when measuring the wind speed under conditions where the temperature fluctuation is large, it is necessary to provide a temperature compensator that detects the temperature at the time of measurement and compensates the wind speed according to the temperature difference in order to increase the detection accuracy. . However, since the temperature time constant of the temperature sensor of the temperature compensator is much larger than the temperature time constant of the platinum resistance wire of the wind speed sensor 5, when the platinum resistance wire of the wind speed sensor 5 performs measurement, the temperature sensor of the temperature compensator is Since it is not detecting the actual temperature,
It is necessary to wait for a while for the temperature sensor to detect the actual temperature, and there is a problem that the measurement takes time and the working efficiency is extremely low.

Further, by setting the temperature of the air flow to about room temperature by the cooler 22, the temperature range that can be detected by the wind speed sensor 5 is narrowed, and the wind speed sensor 5 giving priority to accuracy can be selected. 5b is a long window hole formed in the forward part of the case 5a. The upper end of the long window hole 5b is exposed outside from the cylindrical body of the joint 23, and the case 5
The air flow that has flowed into a is discharged to the outside without generating back pressure. Reference numeral 21 denotes a temperature compensator. The temperature compensator 21 incorporates a thermistor. The temperature compensator 21 uses a characteristic of a thermistor whose resistance value changes according to the temperature. The detection current value is corrected to suppress the fluctuation of the detection value due to the temperature, thereby increasing the detection accuracy.

With the above-described structure, the air nozzle 4a for blowing air from the air supply tube 3 is located at the center of the node opening J of the flow path R, as in the first preferred embodiment. At this time, the air flow enters from one of the arcuate paths, passes through the arcuate path, hits the cylindrical wall W, descends, and flows into the space P formed below the vertical hole S. And
Although a part of the air flow flows out of the flow path R, most of the air flow flows into the cooler 22 attached to the holder 20 sealingly fitting the vertical hole S, and the spiral cooler 22 Flow inside. The airflow is cooled while passing through the spiral cooler 22. Then, the air flow reduced to the room temperature level flows into the case 5a of the wind speed sensor 5, and
It will be sprayed on the sensor part in the case 5a.
The platinum resistance wire that is generating heat by this air flow is cooled,
This cooling changes the resistance of the platinum resistance wire, and the wind speed is detected based on this resistance.

At this time, the temperature of the flowing air flow is detected by the thermistor of the temperature compensator 21 and the detected value is corrected in accordance with the temperature to obtain a more accurate wind speed. The operation of the temperature compensator 21 may be canceled, or the air flow may be at approximately room temperature, and compensation may be performed based on the temperature. Since the degree of blockage (opening ratio) is obtained based on the wind speed measured in this way, it is possible to detect a clogged or narrowed state of the flow path R. If there is no blockage in the flow path R and no narrowing exceeding the allowable level, it is determined to be a non-defective product. However, if there is a stenosis (including clogging) exceeding the allowable level (threshold),
Exclude as defective molding. Although the cooler 22 is formed in a spiral shape, it is necessary to increase the air pressure because the spiral shape increases the pipeline resistance. However, when the air pressure is high, the air flows to an extra place and deteriorates the measurement accuracy. Therefore, when a highly accurate detection is required, as shown in FIG.
It is preferable that the cooler 22 is made of a copper or aluminum honeycomb having good heat conduction with a large area and a short flow distance to reduce pipeline resistance.

[0021]

According to the present invention, as apparent from the above description, the air delivered from the air supply cylinder flows into the flow path,
By detecting the air flowing out of the flow path with the wind speed sensor, it is possible to reliably detect the molding failure of the flow path with a small amount of air compared to the inspection of the inside of the flow path with flow rate and pressure, The power consumption can be reduced by reducing the size of the air generating device, and no violent noise is generated at the time of inspection because no high-pressure air is used. Further, if the air flow is introduced into a wide space and the air flow is averaged as in the second aspect, stable detection can be performed, and the detection accuracy can be improved. By cooling the air flow to about room temperature as described above, high detection accuracy can be obtained without performing temperature compensation, and thus the detection time can be shortened. If the air flow is directly detected as in claim 5, it is only necessary to insert the wind speed sensor into the vertical hole, so that the time required for the inspection can be reduced.
A space is obtained very easily by sealing the vertical hole as in claim 6, and the wind speed is detected based on the air flow averaged in the space. Can be detected. By cooling the air flow by the cooler as in claim 7, the detection accuracy can be increased at low cost and the detection time can be shortened. By making the air supply cylinder pivotable, the inspection of the plurality of flow paths can be performed continuously in a short time, and the air nozzle is accurately positioned at the center of the node opening of the flow path. Since it is not necessary to perform the inspection, the inspection can be performed efficiently. Further, by making the air nozzle close to the nodal opening of the flow path as described in claim 9, air having a high directivity can be flowed in, so that the inspection accuracy can be further improved. It has. Accordingly, the present invention is extremely significant in that it contributes to the development of the industry as a method and an apparatus for inspecting a defective casting hole in a cast product which has solved the conventional problems.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first preferred embodiment of the present invention.

FIG. 2 is a plan view showing a first preferred embodiment of the present invention.

FIG. 3 is an air circuit diagram used in the first preferred embodiment of the present invention.

FIG. 4 is a sectional view of another air supply cylinder used in the first preferred embodiment of the present invention.

FIG. 5 is a plan view of another air supply cylinder used in the first preferred embodiment of the present invention.

FIG. 6 is a plan view showing another measuring jig used in the first preferred embodiment of the present invention.

FIG. 7 is a graph showing the wind speed detected by the wind speed sensor when the angle of the air nozzle facing the wind speed sensor at a predetermined distance is changed.

FIG. 8 is a graph showing detection results obtained by using the air supply cylinder according to the first preferred embodiment of the present invention.

FIG. 9 is a graph showing detection results obtained by another air supply cylinder used in the first preferred embodiment of the present invention.

FIG. 10 is a graph showing wind speed when a simulation test was performed;
(A) is an air pressure of 1.5 kgf / cm ² ,
(B) shows an air pressure of 3.0 kgf / cm ² .

FIG. 11 is a sectional view showing a second preferred embodiment of the present invention.

FIG. 12 is a sectional view showing a third preferred embodiment of the present invention.

FIG. 13 is a cross-sectional view showing another cooler used in the third preferred embodiment of the present invention.

[Explanation of symbols]

 3 Air supply cylinder 4a Air nozzle 5 Wind speed sensor 22 Cooler J node opening P Space R Flow path S Vertical hole

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Nishikawa 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Hideo Niwa 4-52 Honchicho Toyota City, Aichi Prefecture Ryoei Engineering Co., Ltd. Within the company (72) Inventor Hirokazu Yoshikawa 4-52, Honchi-cho, Toyota-shi, Aichi Prefecture Ryoei Engineering Co., Ltd. (72) Inventor Takuya Hirano 4-52, Honchi-cho, Toyota-shi, Aichi Prefecture Ryoei Engineering Co., Ltd. F term (reference) 2G024 AA01 BA01 BA11 BA27 CA16 CA30 DA15 2G087 AA12 AA14 BB40 CC29 CC40 DD07

Claims (9)

[Claims] 1. A non-linear flow path (R) formed inside a cast product has a node opening (J) for sending air into the flow path, and is adjacent to the flow path (R) in an air feeding direction. A method for inspecting defective molding holes of a cast molded product, wherein an air flow flowing out from a nodal opening (J) is detected by a wind speed sensor (5). 2. The method according to claim 1, wherein the detection is performed based on an averaged air flow introduced into a wide space (P). 3. The method according to claim 1, wherein the detection is performed based on the cooled air flow. 4. One or more nodal openings in one or more non-linear flow paths (R) formed inside the casting.
(J), the air nozzle (4a) of the air supply cylinder (3) is exposed through the vertical hole (S), and the one or more flow paths (R)
An apparatus for inspecting a defective molding hole of a casting, comprising a wind speed sensor (5) for detecting an air flow from one or a plurality of adjacent node openings (J). 5. The inspection apparatus according to claim 4, wherein the wind speed sensor directly detects an air flow from the node opening. 6. An air flow from an air nozzle (4a) is applied to a space (P).
6. The apparatus according to claim 4, wherein the air flow in the space (P) is introduced into a wind speed sensor (5) for detection. 7. An air flow from an air nozzle (4a) is cooled by a cooler (2).
2), the air flow passing through the cooler (22) is
The apparatus for inspecting defective casting holes in a casting according to claim 4 or 6, wherein the apparatus is used to detect the defective molding in a casting. 8. The apparatus according to claim 4, wherein the air nozzle (4a) of the air supply cylinder (3) is rotatable. 9. The air nozzle (4a) is provided with a node opening (J) of the flow path (R).
9. The apparatus for inspecting a defective molding hole of a cast molded product according to claim 4, wherein the apparatus is protruded so as to be close to the hole.