JP7240922B2 - Casting product inspection device - Google Patents

Description

The present invention relates to a casting inspection apparatus for inspecting castings such as disk rotors.

Casting characters may be formed at the time of casting to give the casting some identifying information. For example, in a disk rotor formed by casting, a manufacturer's name, a car body specific symbol, and a wear limit mark are formed as casting characters. In this specification, "characters" such as cast characters not only refer to characters in a narrow sense such as alphabets, but also include numerals, symbols, codes, marks, and the like.

Casting characters may not be visually identifiable because the characters are missing or partly crushed. Therefore, if the cast character exceeds the allowable range and has a shape that is difficult to identify, it is necessary to determine that the product is defective, but it is inefficient to perform such sorting visually.

Therefore, there has been proposed a cast-out character recognition device that automatically recognizes cast-out characters by three-dimensionally measuring the cast-out characters with a laser scanning sensor (see, for example, Patent Document 1).

JP 2007-219943 A

When cast characters are formed on castings, they are sometimes formed in relatively inconspicuous places. Specifically, it may be formed on the inner peripheral surface of the through hole. In the case of a ventilated type disk rotor, cast characters are formed on the inner peripheral surface of the ventilated portion.

In this case, in the conventional cast-out character recognition device, a laser beam is irradiated from above the cast-out character, and the reflected light is detected by a sensor directly above the cast-out character. Unable to recognize characters. Although it is conceivable to irradiate the laser beam from one side of the through hole, the irradiated laser beam reaches only a part of the cast character, and there are many parts where the reflected light does not return to the sensor. Characters cannot be recognized accurately enough to determine whether they are correct or not. Therefore, the actual situation is that the inspection of cast characters formed on the inner peripheral surface of the through hole is entrusted to visual inspection by humans.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a casting inspection apparatus capable of efficiently inspecting protrusions such as cast characters formed in through holes of castings. do.

In order to achieve the above object, a first invention is a cast product inspection apparatus for inspecting a protruding portion protruding from the inner peripheral surface of a through hole formed in a cast product,
a first light source that irradiates light of a first wavelength from a first end side of the through hole toward the projecting portion;
a second light source that irradiates light of a second wavelength different from the first wavelength toward the protruding portion from a second end side of the through hole;
an imaging unit configured to capture an image of the projecting portion from the first end while the first light source and the second light source are emitting light;
A synthesized image obtained by extracting a first image based on the wavelength component of the first wavelength and a second image based on the wavelength component of the second wavelength from the result of imaging by the imaging unit, and synthesizing the first image and the second image. a specifying unit that specifies the shape of the protrusion by generating a
characterized by comprising

A second invention is characterized in that, in the first invention, the projecting portion is a cast character.

In a third invention based on the second invention, the casting includes an annular sliding portion and a plurality of ventilating portions, which are the through holes penetrating the sliding portion in a radial direction. is a disk rotor,
The cast character is formed near the outer circumference of the sliding portion in the ventilating portion,
The second light source is arranged on the inner peripheral side of the sliding portion,
The first light source and the imaging section are arranged on the outer peripheral side of the sliding section.

In a fourth aspect based on the third aspect, the first light source and the second light source are arranged in parallel with the extending direction of the ventilating portion or from obliquely above the extending direction of the ventilating portion. It irradiates light toward the cast characters,
The image capturing unit is installed so as to capture an image obliquely from above the surface of the cast character and to have a depression angle larger than that of the first light source.

A fifth invention is characterized in that in the third or fourth invention, a rotating mechanism is provided to rotate the disk rotor about the central axis of the annular sliding portion.

According to the first invention, by irradiating the projecting portion with light from the first light source from the first end side of the through hole, the shadow (first outline) formed by blocking the light by the projecting portion is formed. , is generated on the second end side of the through-hole in the projecting portion. Similarly, by irradiating the projecting portion with light from the second light source from the second end side of the through hole, a shadow (second contour) formed by blocking the light by the projecting portion It occurs on the first end side of the through hole. By specifying the shape of the protrusion from these shadows (contours), it becomes possible to specify the shape of the protrusion even if the light is applied to the protrusion not from directly above but from the lateral direction. .

Further, in a state in which light is emitted from the first light source and the second light source at the same time, shadows that cause the first contour and the second contour are erased. In this regard, in the first invention, the first light source and the second light source emit light of different wavelengths, and after the image is captured by the imaging unit, the first image by the first wavelength component and the second image by the second wavelength component are captured. By extracting two images and synthesizing the images, the shape of the protrusion can be specified using the shadow (outline). Therefore, the repeated operation of irradiating light from only one light source to take an image and irradiating light from only the other light source to take an image becomes unnecessary, and the shape of the protruding portion can be specified at once, and inspection can be performed. Improve efficiency.

According to the second aspect of the present invention, by subjecting cast characters presenting information such as information used for identifying a cast product to inspection, it is possible to inspect whether the cast characters are human-readable. can.

According to the third invention, in a disk rotor having a plurality of ventilating portions formed in a sliding portion, it is possible to inspect cast characters indicating information such as a manufacturer's name. A sliding portion of the disk rotor is formed in an annular shape, and cast characters are formed near the outer periphery. Therefore, by installing the light sources on the inner peripheral side and the outer peripheral side with respect to the ventilating section and installing the imaging section on the outer peripheral side, only one of the light sources needs to be arranged in the narrow space on the inner peripheral side. As a result, it becomes possible to image the embossed characters at a position close to the outer periphery of the ventilating portion.

According to the fourth invention, the image pickup unit picks up an image of the casting character from obliquely above, and the angle of depression is set to be larger than that of the first light source installed on the outer peripheral side. The shadow (contour) formed by the first light source arranged on the side can be reliably imaged by the imaging unit. As a result, both the first image and the second image can be captured relatively accurately, and inspection accuracy can be improved.

According to the fifth invention, even if the first light source, the second light source, and the imaging section are fixed, by rotating the disk rotor, all cast characters formed near the outer periphery of each ventilating section are inspected. Therefore, the automatic inspection of the disk rotor can be efficiently performed.

FIG. 2 is a schematic diagram showing a longitudinal section of a disk rotor and a configuration of an inspection device; FIG. 2 is a cross-sectional view of a disk rotor (cross-sectional view along line 2-2 in FIG. 1) and a schematic diagram showing the configuration of a part of an inspection device; 4A and 4B are flowcharts showing processing by an image processing unit and diagrams for explaining images in the process;

An embodiment embodying the present invention will be described with reference to the drawings. A plurality of cast characters 11 are formed on a disk rotor 10 used as part of a vehicle brake mechanism. The casting inspection apparatus of the present invention is embodied as an inspection apparatus 30 for inspecting the cast characters 11 in this embodiment.

<Configuration of Disk Rotor 10>
First, the configuration of the disk rotor 10 to be inspected by the inspection device 30 will be described. As shown in FIGS. 1 and 2 , the disk rotor 10 has a substantially disk shape as a whole and has a hat portion 12 and a sliding portion 13 . The hat part 12 is attached to a hub provided at the end of an axle of a vehicle such as an automobile. The hat portion 12 has a bottom portion 14 and a peripheral portion 15 .

The bottom portion 14 has a circular plate shape, and a mounting hole 16 is formed in the center portion thereof. A plurality of bolt insertion holes (not shown) are formed around the attachment hole 16 . The disk rotor 10 is connected to the hub using the mounting holes 16 and the bolt insertion holes. The peripheral surface portion 15 has a cylindrical shape extending from the outer peripheral edge of the bottom surface portion 14 and forms the peripheral surface of the hat portion 12 .

The sliding portion 13 is connected to the end portion of the peripheral surface portion 15 opposite to the bottom surface portion 14 . The sliding portion 13 is a portion that is sandwiched and press-contacted by the disc pad when the vehicle is braked. The sliding portion 13 is formed so as to protrude outward from the peripheral surface portion 15 so as to form an annular shape. Both front and back surfaces of the sliding portion 13 form a pair of sliding surfaces 17 that are pressed against each other by disc pads.

The sliding portion 13 includes an inner disk portion 18 , an outer disk portion 19 arranged closer to the outer side than the inner disk portion 18 , and fins 20 . The fins 20 connect the inner disk portion 18 and the outer disk portion 19 at multiple points in the circumferential direction. The fins 20 extend radially, and a space surrounded by the inner disk portion 18, the outer disk portion 19, and the fins 20 serves as a ventilating portion 21 penetrating in the radial direction (radial direction). The ventilating portion 21 is a passage through which air flows when the vehicle is running, and the sliding portion 13 can be quickly cooled by the air flowing. The ventilating portion 21 corresponds to the through hole.

The disk rotor 10 of the present embodiment is an inner hat type in which the peripheral surface portion 15 and the inner disk portion 18 are connected, and is a one-piece cast product in which the hat portion 12 and the sliding portion 13 are integrally formed. is.

The disk rotor 10 is formed with cast characters 11 projecting from the surface of the inner disk portion 18 on the ventilating portion 21 side toward the outer disk portion 19 side. The cast characters 11 are formed one by one for each ventilating portion 21 and are formed by casting. The embossed characters 11 are for displaying the manufacturer's name, vehicle-specific symbols, and wear limit marks. The cast characters 11 are formed at a position closer to the outer peripheral end than the inner peripheral end of the ventilating portion 21, making it easier to visually confirm the displayed contents from the outer peripheral side of the disk rotor 10.

A core is used in the casting stage to form the ventilating portion 21 and the cast characters 11 . A window portion 22 is formed in the peripheral surface portion 15 of the inner hat type disk rotor 10 by using a baseboard in the casting stage. The window portion 22 is a space portion penetrating inside and outside of the peripheral surface portion 15 and is formed at the same height position as the ventilating portion 21 . Further, as shown in FIG. 2, one window portion 22 is formed for a pair of adjacent ventilating portions 21 so that the core can be passed through the pair of ventilating portions 21 adjacent to each other.

Here, since the cast characters 11 are integrally formed with the disk rotor 10 by casting, the characters may be missing or partly crushed. Therefore, it is necessary to check whether or not the cast-out characters 11 are of a level that does not hinder the reading of information such as the manufacturer's name. An inspection device 30 for this inspection will be described below.

<Configuration of inspection device 30>
The inspection device 30 includes a support shaft portion 31 arranged on the inner peripheral side of the hat portion 12 . The support shaft portion 31 extends vertically. An engaging portion 32 formed on the upper end side of the support shaft portion 31 is inserted into the mounting hole 16 and engaged with the disk rotor 10, so that the disk rotor 10 can rotate integrally with the support shaft portion 31. supported by the state. A motor 33 is connected to the support shaft portion 31, and the rotation of the motor 33 allows the disk rotor 10 to rotate about its own central axis.

A color camera 35 as an imaging section and a blue LED 36 as a first light source are installed on the outer peripheral side of the hat section 12 . A red LED 37 as a second light source is installed in the gap between the inner peripheral surface of the hat portion 12 and the outer peripheral surface of the support shaft portion 31 .

The red LED 37 irradiates light of a wavelength corresponding to red from the inner peripheral end of the ventilating portion 21 toward the outer peripheral end thereof through the window portion 22, and the optical axis extends in the horizontal direction along the ventilating portion 21. is directed. As shown in FIG. 2, the red LEDs 37 emit light toward a pair of adjacent ventilating portions 21 .

The blue LED 36 irradiates light of a wavelength corresponding to blue from the outer peripheral end of the ventilating portion 21 toward the inner peripheral end thereof, and its optical axis is oriented in the horizontal direction along the ventilating portion 21 . As shown in FIG. 2, a pair of blue LEDs 36 are provided and arranged on extensions of a pair of adjacent ventilating portions 21 .

The color camera 35 is a camera that can simultaneously acquire light of each wavelength emitted from the blue LED 36 and the red LED 37 . The color camera 35 is arranged obliquely above the cast character 11 . Here, the depression angle .theta.1 of the color camera 35 is larger than the depression angle .theta.2 (=0 degree) of the blue LED 36 and the red LED 37 whose optical axes are provided in the horizontal direction. The color camera 35 is positioned between the pair of blue LEDs 36 and on the extension of the optical axis of the red LED 37 in plan view, as shown in FIG. The color camera 35 is set so as to be able to image the embossed characters 11 arranged on a pair of adjacent ventilating portions 21 at once. For example, in the state of FIG. 2, two cast characters 11 of "M" and "I" are imaged at once.

The inspection device 30 includes a controller 40 that controls the motor 33 , color camera 35 , blue LED 36 and red LED 37 .

The controller 40 has a rotation control section 41 , and the rotation of the motor 33 is controlled by the rotation control section 41 . The controller 40 includes an LED control section 42 that controls turning on and off of the pair of blue LED 36 and red LED 37 . The controller 40 has a camera control section 43 , and the camera control section 43 controls the imaging timing of the color camera 35 .

The rotation control unit 41 rotates the disk rotor 10, and stops at a rotation position where the red LED 37 is positioned at the center of the window portion 22 and the blue LEDs 36 are positioned at the center of each ventilating portion 21, as shown in FIG. Let While the rotation control unit 41 stops the motor 33, the LED control unit 42 turns on the blue LED 36 and the red LED 37, and at the same time, the camera control unit 43 causes the color camera 35 to take an image. The color camera 35 takes images of the two cast-out characters 11 illuminated by the blue LEDs 36 and the red LEDs 37 at once.

When the imaging by the color camera 35 is completed, the LED control unit 42 turns off the blue LED 36 and the red LED 37, and the rotation control unit 41 rotates the motor 33 until the red LED 37 is positioned at the center position of the next window portion 22. Let As a result, the next cast character 11 can be imaged.

The controller 40 includes an image storage section 44, in which images captured by the color camera 35 are stored. The controller 40 includes an image processing section 45 , which extracts an image captured by the color camera 35 from the image storage section 44 and processes it to specify the shape of the cast-out character 11 . Processing executed by the image processing unit 45 will be described below.

<Flow of image processing>
In step S11, the image processing unit 45 determines whether or not the cast character 11 is newly imaged by the color camera 35 based on the information stored in the image storage unit 44. FIG. If the cast-out character 11 is not newly imaged, the processing is terminated. If there is a newly captured image, the process proceeds to step S12.

Note that the color camera 35 takes images of two adjacent cast-out characters 11 at a time, and executes the following image processing for these two cast-out characters 11 . For example, in the state of FIG. 2, the two cast characters 11 of "M" and "I" are simultaneously imaged and image-processed. However, since the image processing is the same for each cast-out character 11, the cast-out character 11 indicated as "M" in FIG. 2 will be described below as an example.

In step S12, the image extracted from the image storage unit 44 is filtered to extract only the red wavelength component, and the second image 51 obtained from the red wavelength component is extracted. As shown in FIG. 3A, the second image 51 is a shadow of the cast character 11 in a state where the red LED 37 is irradiated from the upper side of FIG. Since the second shadow image portion 52 is extracted, a part of the outline (lower portion) of the cast character 11 can be grasped. The second image 51 is temporarily stored in the image storage unit 44 .

Next, in step S13, the image is filtered to extract only the blue wavelength component, and the first image 53 obtained by the blue wavelength component is extracted. As shown in FIG. 3(b), as the first image 53, the cast character 11 is illuminated with the blue LED 36 from the lower side of FIG. Since the first shadow image portion 54, which is a shadow, is extracted, a part of the outline (upper portion) of the cast character 11 can be grasped. The first image 53 is temporarily stored in the image storage unit 44 .

After that, in step S14, a synthesized image 55 is generated by synthesizing the second image 51 and the first image 53 temporarily stored in the image storage unit 44. FIG. As shown in FIG. 3C, the composite image 55 is obtained by combining the second shadow image portion 52 and the first shadow image portion 54, and the entire contour of the cast character 11 is highlighted. That is, the enclosing area 56 surrounded by the second shadow image portion 52 and the first shadow image portion 54 corresponds to the area corresponding to the cast character 11 . The composite image 55 is temporarily stored in the image storage unit 44 .

Next, in step S15, the enclosing area 56 corresponding to the cast character 11 is cut out. The cutout process cuts out the boundary between the second shadow image portion 52 and the first shadow image portion 54 and the enclosing area 56, and specifies only the character portion 58 corresponding to the enclosing area 56, as shown in FIG. This is processing for extracting the image 57 . The specific image 57 is temporarily stored in the image storage unit 44 .

As a result of the processing by the image processing unit 45 described above, the specific image 57 including the character portion 58 corresponding to the cast character 11 is generated.

As shown in FIG. 1, the controller 40 includes an image determination section 46, which determines whether or not the character portion 58 included in the specific image 57 is within the normal range. The image determination section 46 registers reference characters in advance, and performs determination by comparing the character section 58 with the reference characters. For example, the determination can be made by comparing the entire area, comparing the partial area, dividing the characters and comparing the difference in length, and other comparisons. The determination processing method is not limited to this. If any one of the character portions 58 read from the disk rotor 10 is determined to be out of the normal range, the disk rotor 10 is regarded as a defective product and excluded from shipment.

<Effect>
According to the inspection apparatus 30 described above, the following effects can be obtained.

The characters 11 formed on the ventilating portion 21 of the disk rotor 10 may be missing or partly crushed. Conventionally, whether or not the cast character 11 is formed normally was visually confirmed, but the inspection device 30 automatically identifies the cast character 11 and determines whether or not it is a defective product. can be done.

By irradiating the cast character 11 with the red LED 37 from the inner peripheral side of the ventilating portion 21, the shadow (outline) formed by the light being blocked by the cast character 11 is the bench of the cast character 11. It occurs on the outer peripheral side of the rate portion 21 . Similarly, by irradiating the blue LED 36 from the outer peripheral side of the ventilating portion 21 to the cast character 11, the shadow (outline) formed by the light being blocked by the cast character 11 is formed by the cast character 11. Among them, it occurs on the inner peripheral side of the ventilating portion 21 . By specifying the shape of the cast character 11 from these shadows (contours), even if the cast character 11 is irradiated with light from the lateral direction instead of directly above, the shape of the cast character 11 can be determined. can be specified.

When the blue LED 36 and the red LED 37 emit light at the same time, the shadow (outline) of the cast character 11 is erased. In this regard, the blue LED 36 and the red LED 37 emit lights of different wavelengths, and after the image is captured by the color camera 35, a second shadow image portion 52 with the red wavelength component and a first shadow image portion 54 with the blue wavelength component are obtained. By extracting and synthesizing them, the shape of the cast character 11 can be specified. Therefore, the repeated operation of irradiating light from only the blue LED 36 to capture an image and then irradiating light from only the red LED 37 to capture an image becomes unnecessary, and the shape of the cast character 11 can be specified at once. Improves inspection efficiency.

In the ventilating portion 21, the manufacturer's name and other information are formed in one character per ventilating portion 21, and a large number of cast characters 11 exist along the outer circumference of the disk rotor 10. . In this regard, since the disk rotor 10 can be rotated about its central axis by the support shaft 31, the cast characters 11 are inspected one after another while the color camera 35, blue LED 36 and red LED 37 are fixed. be able to.

Since only the red LED 37 is installed inside the hat portion 12, which is the inner peripheral side of the ventilating portion 21, and the blue LED 36 and the color camera 35 are installed outside the hat portion 12, many inspection devices can be installed inside the hat portion 12. is no longer necessary, and interference between the disk rotor 10 and inspection equipment is less likely to occur. In addition, since the color camera 35 is installed outside the hat portion 12, it is possible to capture an image in a position relatively close to the cast character 11 with the color camera 35 sufficiently tilted. As a result, the second shadow image portion 52 and the first shadow image portion 54 can be obtained with clear contours.

In the inner hat type disk rotor 10 , one window portion 22 is formed corresponding to two adjacent ventilating portions 21 . Therefore, only one red LED 37 is installed on the inner peripheral side so as to irradiate the two ventilating portions 21 with light, and two blue LEDs 36 are installed on the outer peripheral side. Since the color camera 35 takes images of two cast-out characters 11 at the same time and performs image processing, it is possible to inspect a plurality of cast-out characters 11 at the same time while reducing the number of inspection devices, resulting in low cost. can improve inspection efficiency. Moreover, since the color camera 35 simultaneously captures the two cast-out characters 11 of "M" and "I" in the state of FIG. be. Therefore, there is an advantage that the shadow of each cast character 11 can be clearly identified as compared with the case where the image is taken from the direction along the ventilation part 21 in plan view.

<Modification>
Modifications of the above embodiment will be described below.

(1) For characters such as “O” and “X”, which have portions that intersect the light irradiation direction multiple times, the LEDs 36 and 37 are illuminated horizontally with respect to the cast character 11. , it may not be possible to extract all the contours of the cast character 11 from the second shadow image portion 52 and the first shadow image portion 54 only by irradiating . For example, if it is "O", the outline on the outer peripheral side can be extracted, but the outline on the inner peripheral side may not be extracted. In order to cope with a character having a portion that intersects with the irradiation direction of light multiple times, each LED 36, 37 is directed obliquely downward from above the cast character 11 within a range that does not interfere with the ventilation part 21. Good. Even in this case, it is necessary to make the depression angle θ1 of the color camera 35 larger than the depression angle θ2 (>0 degree) of the blue LED 36 .

(2) In the inspection device 30, the LEDs 36 and 37 are turned on when the disk rotor 10 is not rotating, and after the image is captured by the color camera 35, the LEDs 36 and 37 are turned off before the disk rotor 10 is rotated. Alternatively, while the disk rotor 10 is rotating and the LEDs 36 and 37 are lit, the imaging timing or the like may be determined using a sensor or the like, and the color camera 35 may successively image the cast-out characters 11. . In this case, when the disk rotor 10 completes one revolution, the rotation of the disk rotor 10 is stopped and the disk rotor 10 to be inspected next is replaced, thereby further improving the inspection efficiency.

(3) The disk rotor 10 may not have a one-piece structure. For example, a two-piece structure in which only the sliding portion 13 is manufactured as a casting part, the hat portion 12 is manufactured from aluminum or the like, and these are connected may be employed. Further, the present invention may be applied to an outer hat type disk rotor in which the outer disk portion 19 and the peripheral surface portion 15 are connected to each other instead of the inner hat type. Further, the shapes of the fins 20 and the ventilating portion 21 are not limited to linear shapes, and may be curved shapes.

(4) The object to be inspected is not limited to the disk rotor 10, but may be any casting having through holes. In this case, the light source such as the LED and the imaging unit such as the color camera 35 may capture an image while entering the hole from both ends of the through hole.

(5) The inspection device 30 may be used to inspect whether or not any projection exceeding the allowable range is formed inside the through-hole, not limited to the casting character 11 .

(6) Although the blue LED 36 and the red LED 37 are used to irradiate lights with different wavelengths from different directions, LEDs with other wavelengths may be used. Moreover, you may use light sources other than LED.

DESCRIPTION OF SYMBOLS 10... Disk rotor (cast article) 11... Casting character (projection part) 12... Hat part 13... Sliding part 14... Bottom part 15... Peripheral part 16... Mounting hole 17... Sliding surface , 18... Inner disk portion, 19... Outer disk portion, 20... Fin, 21... Ventilate portion (through hole), 22... Window portion, 30... Inspection device (cast product inspection device), 31... Support shaft portion, 32 Engaging portion 33 Motor 35 Color camera (imaging unit) 36 Blue LED (first light source) 37 Red LED (second light source) 40 Controller 41 Rotation control unit 42 LED control unit 43 Camera control unit 44 Image storage unit 45 Image processing unit (specification unit) 46 Image determination unit 51 Second image 52 Second shadow image unit 53 First Image 54 First shadow image portion 55 Composite image 56 Surrounding area 57 Specific image 58 Character portion.

Claims (3)

A casting having an annular sliding portion and a through hole penetrating radially through the sliding portion has an inner peripheral surface of the through hole near the outer periphery of the sliding portion. A casting inspection device for inspecting cast characters protruding from the peripheral surface,
With the through hole extending in the horizontal direction, the cast character positioned at the bottom of the through hole has a flat portion on its upper surface,
In the through-hole, light of a first wavelength is emitted from a first end on the outer peripheral side of the sliding portion toward the cast character from diagonally above the horizontal direction, which is the direction in which the through-hole extends. a first light source for irradiation;
In the through-hole, the first wavelength and the is a second light source that emits light of a second wavelength different from the wavelength;
In a state in which the first light source and the second light source are irradiating light, obliquely above the surface of the cast character facing upward on the first end side and from the first light source an imaging unit that captures an image of the cast character from a direction with a large depression angle;
A first image based on the wavelength component of the first wavelength and a second image based on the wavelength component of the second wavelength are respectively extracted from the result of imaging by the imaging unit using a wavelength filter, and the first image and the second image are extracted. a specifying part that specifies the shape of the cast character surrounded by the shadow part of the first image and the shadow part of the second image by generating a synthesized composite image;
A casting inspection device comprising: 2. The cast product according to claim 1, wherein the cast product is a disk rotor comprising the annular sliding portion and a plurality of ventilating portions, which are the through-holes extending radially through the sliding portion. casting inspection equipment. 3. The cast product inspection apparatus according to claim 2, further comprising a rotating mechanism for rotating said disk rotor around the central axis of said annular sliding portion.

Images