JP6016515B2 - Inspection equipment for press parts - Google Patents

Description

  The present invention relates to a press part inspection apparatus that inspects whether a press part is a non-defective product or a defective product after press molding.

  2. Description of the Related Art Conventionally, an inspection device for inspecting whether a press part after press molding has a scratch, a crack or the like has been arranged in a press part production line. For example, the inspection apparatus disclosed in Patent Document 1 includes a conveyor that conveys a panel-shaped pressed part after molding, and the conveyor is placed in a horizontal direction in a posture in which the panel surface faces upward. It is transported to. In the conveyor, a flat surface inspection area for inspecting a flat surface portion of the pressed part and a side surface inspection area for inspecting a side surface portion continuous to the periphery of the flat surface portion are arranged in parallel in the transport direction. Illumination means and photographing means are arranged opposite to each other with the conveyor interposed therebetween. The illuminating means includes a light source and reflecting means for reflecting light emitted from the light source, and the light source is movable in a horizontal direction and a vertical direction perpendicular to a transport direction, and is located below the light source. Reflecting means are arranged. The reflecting means is rotatable, and the irradiation direction of the light irradiated from the light source to the press part can be changed. On the other hand, the photographing means includes a camera for photographing the panel part, and the camera is movable in a horizontal direction and a vertical direction perpendicular to the conveying direction. This camera is provided with camera rotation means for rotating the camera to change the shooting direction.

  And a press part is conveyed intermittently to the said plane part inspection area and curved surface part inspection area with a conveyor sequentially, and the camera is changing the irradiation position and irradiation direction of a light source in the state which stopped the press part in each said area. The shooting position and the shooting direction are changed and the press part is shot. The image processing machine provided on both sides of the conveyor conveyance direction downstream calculates the shot image and the calculation data to the press part. The quality of the pressed part is judged by comparing with the reference data of the surface finish state.

Japanese Patent Laid-Open No. 2002-39946 (paragraphs 0021 to 0041, FIGS. 1 to 3)

  However, the inspection apparatus of Patent Document 1 shoots the flat part and the side part of the pressed part in different areas, and thus occupies a large installation space in the production line. Moreover, the inspection apparatus as disclosed in Patent Document 1 is complicated and large, and the cost increases.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a low-cost and compact inspection apparatus for a press part that can determine the quality of the press part.

  In order to achieve the above object, the present invention is characterized in that a press part conveyed by a conveying means is irradiated with light from two directions and photographed with a camera.

That is, according to the first aspect of the present invention, a panel-shaped press part composed of a flat portion and a side portion continuous to the periphery of the flat portion is placed with the flat portion in a posture along the carrying direction, and is conveyed linearly at a constant speed. A conveyor , a camera that shoots the press part from above perpendicular to the transport direction, and a camera that shoots the press part when the press part transported by the conveyor crosses the photographing region , and a side of the camera A first light source that irradiates light perpendicularly to a flat part of a press part that has entered the imaging region of the camera, and a press that is disposed on the side of the first light source and enters the imaging region of the camera. A second light source for obliquely irradiating light to the flat part of the part, a calculation part for calculating an image of the pressed part photographed by the camera, and reference data of the surface finish state of the pressed part are stored in advance. Has 憶部, characterized in that it comprises a judging means for judging quality of the pressed parts by comparing the computed data and the reference data of stamped parts processed by the arithmetic unit.

  The second invention is characterized in that, in the first invention, the illumination colors of the first and second light sources are different.

  According to a third invention, in the first or second invention, a plurality of the first light sources are arranged in a ring shape with a predetermined interval around the camera, and the second light sources are arranged outside the first light sources. On the other hand, a plurality of the sensors are annularly arranged around the camera at a predetermined interval.

According to a fourth aspect, in the third aspect, the second light source gradually approaches the conveyor as it goes outward.

In the first invention, when the plane part of the press part that passes through the imaging region of the camera is photographed, the plane part of the press part is illuminated by the light of the first light source, and the photographed image of the camera becomes clear and the plane part is When scratches or the like are generated, the scratches or the like are clearly photographed by irregularly reflecting the light of the second light source irradiated obliquely with respect to the plane portion. On the other hand, when the side part of the press part that passes through the camera imaging area is photographed, the side part of the press part is illuminated by the light of the second light source, and the photographed image of the camera becomes clear and the side part is scratched. In this case, a flaw or the like is clearly photographed by the irregular reflection of the light from the first light source irradiated obliquely with respect to the side surface. Therefore, the finished state of the flat part and the side part of the press part can be clearly photographed without changing the irradiation position and irradiation direction of the light source and the photographing position and photographing direction of the camera. Therefore, it is not necessary to perform the shooting and the shooting of the side surface in different areas, and the space of the equipment can be saved. Moreover, it is not necessary to provide a complicated mechanism for changing the irradiation position and irradiation direction of the light source and the shooting position and shooting direction of the camera, and the inspection apparatus can be made at a low cost. Furthermore, since the camera can be photographed while the press part is conveyed by the conveyor , it is not necessary to stop the press part when photographing with the camera as in Patent Document 1, and the inspection time can be shortened.

  In the second invention, a part such as a scratch photographed by a camera and a part that is not a scratch are not only light and dark but also a color difference is caused. It can be further clarified.

  In the third invention, when the press part passes through the imaging region of the camera, all the side surfaces of the press part are illuminated with the second light source, and the scratches and the like generated on the side parts of the press part are reliably detected. be able to.

  In the fourth invention, when the press part passes through the imaging region of the camera, the entire side surface of the press part is illuminated more brightly than the third invention, and the image taken by the camera becomes clearer. It is possible to photograph a scratch or the like with certainty.

(A) is a figure which shows the whole structure of the test | inspection apparatus which concerns on Embodiment 1 of this invention, (b) is A arrow directional view of (a). (A) is the state inspecting the side part of the front side of the pressed part in the conveying direction, (b) is the state inspecting the flat part of the pressed part, and (c) is the conveying direction of the pressed part. It is a figure which shows the state which test | inspects the rear side part. It is FIG. 1 equivalent view of Embodiment 2 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.
Embodiment 1 of the Invention
FIG. 1 shows an inspection apparatus 1 for press parts according to the present invention. The inspection apparatus 1 is arranged on a production line of a vehicle that press-molds a panel-like press part 10 composed of a flat plate 10a and a side part 10b continuous to the periphery of the flat part 10a from a predetermined plate material. It is a device for inspecting scratches, cracks, wrinkles, etc. generated on the surface.

The inspection apparatus 1 places the pressed part 10 in a posture in which the flat portion 10a faces upward, and is constant in a substantially horizontal direction X at 0.7 m / s, for example, in a posture in which the flat portion 10a is along the conveying direction. A belt-type conveyor 2 that linearly conveys at a speed is provided.

Above the conveyor 2, for example, a CCD camera 3 having a photographing speed of 0.2 msec is fixed so as to face downward, and when the press part 10 conveyed by the conveyor 2 crosses the photographing region , the CCD camera 3 The image is taken from above (in a direction orthogonal to the transport direction).

  On the side of the CCD camera 3, an annular first illumination tool 4 is disposed in a plan view surrounding the CCD camera 3.

  The first lighting device 4 includes an annular resin first case 4b, and an annular recess 4d that opens downward is formed in the first case 4b.

  A plurality of white LEDs 4a (first light sources) are annularly arranged along the annular recess 4d in the annular recess 4d, and the opening of the first case 4b is white light emitted from each of the white LEDs 4a. Is diffused by an annular resin first annular diffusion plate 4c that suppresses uneven illumination.

  Each of the white LEDs 4a has a luminance of about 10,000 lux. As shown in FIG. 2 (b), the white LED 4a makes light perpendicular to the flat portion 10a of the press part 10 that has entered the imaging region of the CCD camera 3. On the other hand, as shown in FIGS. 2A and 2C, the side surface portion 10b of the press part 10 entering the imaging region of the CCD camera 3 is irradiated obliquely with light.

  As shown in FIGS. 1 (a) and 1 (b), eight second illumination tools 5 are radially arranged at equal intervals around the first illumination tool 4 in a plan view on the outer side of the first illumination tool 4. It arrange | positions so that it may extend, and each 2nd lighting fixture 5 inclines below as it goes outside. In addition, the distance H between the lower end of each 2nd lighting fixture 5 and the plane part 10a of the said press component 10 is set to about 50-100 mm.

  Each said 2nd lighting fixture 5 is provided with the linear resin 2nd case 5b, and the linear recessed part 5d opened below is formed in this 2nd case 5b.

  In the linear recess 5d, a plurality of red LEDs 5a (second light sources) are linearly arranged along the linear recess 5d, and the opening of the second case 5b is irradiated from each of the red LEDs 5a. The second diffuser plate 5c made of resin is used to diffuse red light and suppress uneven illumination.

  That is, the plurality of red LEDs 5a are arranged in a ring shape at a predetermined interval around the CCD camera 3 on the outer side of each of the white LEDs 4a in plan view. Further, a plurality of the red LEDs 5a are arranged at predetermined intervals so as to be gradually positioned downward (approaching the conveyor 2) as going outward.

  Each red LED 5a has a luminance of about 10,000 lux, and emits light to the flat portion 10a of the press part 10 that has entered the imaging region of the CCD camera 3 as shown in FIG. On the other hand, as shown in FIGS. 2 (a) and 2 (c), light is irradiated vertically to the side surface portion 10b of the press part 10 entering the imaging region of the CCD camera 3, as shown in FIGS. Yes.

  The CCD camera 3 is connected to a control panel 6 (determination means) for controlling the photographing of the CCD camera 3 and for capturing the photographed image.

  The control panel 6 has a calculation unit 6a for calculating an image photographed by the CCD camera 3, and computes the acquired photographed image to generate calculation data from the contrast of the image and the color difference.

  The control panel 6 has a storage unit 6b for storing various data, and the storage unit 6b stores in advance reference data for the surface finish state when the press part 10 is a non-defective product.

  The control panel 6 determines the quality of the pressed part 10 by comparing the calculated data of the pressed part 10 processed by the calculating unit 6a with the reference data. For example, if there is at least one portion considered to be a scratch in the photographed image, it is determined as a defective product.

  A monitor 7 is connected to the control panel 6, and the monitor 7 stores each image of the press part 10 photographed by the CCD camera 3, a processing result in the calculation unit 6 a, and a memory in response to a command from the control panel 6. Each data and determination result stored in the part 6b are displayed.

  Next, the inspection of the pressed part 10 being conveyed by the conveyor 2 by the inspection apparatus 1 will be described.

  As shown in FIG. 2A, the press part 10 after press molding is transported to the inspection device 1 by the conveyor 2, and first, the side surface on the front side in the transport direction of the press part 10 to the photographing region of the CCD camera 3. Part 10b enters. At this time, each white LED 4a irradiates light to the side surface portion 10b obliquely, while each red LED 5a positioned on the front side in the transport direction irradiates light to the side surface portion 10b vertically.

  And the side part 10b located in the conveyance direction front side is image | photographed with the said CCD camera 3 in the state irradiated with light from each said white LED4a and each red LED5a.

  Thereafter, the photographed photographed image is processed by the control panel 6 and compared with the reference data, and the quality of the side surface portion 10b located on the front side in the conveying direction of the press part 10 is determined.

  Next, as shown in FIG. 2B, the plane portion 10 a on the front side in the conveying direction of the press part 10 enters the imaging region of the CCD camera 3. At this time, each white LED 4a irradiates light to the flat portion 10a perpendicularly, while each red LED 5a located on the front side in the transport direction irradiates light to the flat portion 10a obliquely.

  The plane portion 10a is photographed by the CCD camera 3 in a state where light is emitted from the white LEDs 4a and the red LEDs 5a.

  Thereafter, the photographed photographed image is processed by the control panel 6 and compared with the reference data, and the quality of the flat portion 10a of the press part 10 is determined.

  Finally, as shown in FIG. 2C, the side surface portion 10 b on the rear side in the conveying direction of the press part 10 enters the imaging region of the CCD camera 3. At this time, each white LED 4a irradiates light to the side surface portion 10b obliquely, while each red LED 5a positioned on the rear side in the transport direction irradiates light to the side surface portion 10b vertically.

  And the side part 10b located in the conveyance direction rear side is image | photographed with the said CCD camera 3 in the state irradiated with light from each said white LED4a and each red LED5a.

  Thereafter, the photographed photographed image is processed by the control panel 6 and compared with the reference data, and the quality of the side surface portion 10b located on the rear side in the conveying direction of the press part 10 is determined.

  As described above, according to the first embodiment of the present invention, when the plane part 10a of the press part 10 passing through the imaging area of the CCD camera 3 is photographed, the plane part 10a of the press part 10 is illuminated by the light of the white LED 4a. 3 is clear and when the scratch or the like is generated on the flat surface portion 10a, the light of the red LED 5a irradiated obliquely with respect to the flat surface portion 10a is irregularly reflected so that the scratch or the like is clear. Taken. On the other hand, when the side surface portion 10b of the press part 10 passing through the imaging region of the CCD camera 3 is photographed, the side surface portion 10b of the press part 10 is illuminated by the light of the red LED 5a, and the captured image of the CCD camera 3 becomes clear. When a scratch or the like is generated on the side surface portion 10b, the light or the like of the white LED 4a irradiated obliquely with respect to the side surface portion 10b is irregularly reflected so that the scratch or the like is clearly photographed. Therefore, the finished state of the flat surface portion 10a and the side surface portion 10b of the press part 10 can be clearly photographed without changing the irradiation position and irradiation direction of the light source and the photographing position and photographing posture of the CCD camera 3. As described above, it is not necessary to perform photographing of the flat surface portion 10a and photographing of the side surface portion 10b in different areas, and space saving of equipment can be achieved. Further, it is not necessary to provide a complicated mechanism for changing the irradiation position and irradiation direction of the white LED 4a and the red LED 5a and the shooting position and shooting direction of the CCD camera 3, and the inspection apparatus 1 can be made at low cost. Further, since the CCD camera 3 can be photographed while the press part 10 is conveyed by the conveyor 2, it is not necessary to stop the press part 10 when photographing with the camera as in Patent Document 1, and the inspection time can be shortened. Can do.

  In addition, since a color difference is caused not only in the brightness of light but also in a portion such as a scratch photographed by the CCD camera 3 and a portion that is not a scratch or the like, a portion such as a scratch and a portion that is not a scratch are further clearly clarified by image processing. Can be.

  In addition, since the plurality of red LEDs 5a are arranged in a ring shape at a predetermined interval around the CCD camera 3 outside the white LEDs 4a in a plan view, the photographing area of the CCD camera 3 is a press part. When 10 passes, all the side surface parts 10b of the press part 10 are illuminated by the red LED 5a, so that scratches and the like generated on the side surface part 10b of the press part 10 can be reliably found.

In addition, the plurality of red LEDs 5a are arranged at predetermined intervals so as to be gradually located downward as going outward, so that when the press part 10 passes through the photographing area of the CCD camera 3, All the side surface parts 10b of the component 10 are illuminated more brightly, and the image photographed by the CCD camera 3 becomes clear, so that a flaw or the like can be reliably photographed.
<< Embodiment 2 of the Invention >>
FIG. 3 shows an inspection apparatus 1 according to Embodiment 2 of the present invention. In the second embodiment, only the structure of the second illumination tool 5 is different from that of the first embodiment, and the other parts are the same as those of the first embodiment. Therefore, only the parts different from the first embodiment will be described below.

  The 2nd lighting fixture 5 of Embodiment 2 is arrange | positioned around the said 1st lighting fixture 4, and is provided with the bowl-shaped 2nd case 5b which a lower end opens.

  A large number of red LEDs 5a are attached to the entire inner surface of the second case 5b, and these red LEDs 5a have a bowl-like shape that diffuses red light emitted from each of the red LEDs 5a to suppress uneven illumination. It is covered from the inside of the second case 5b with a resin-made second diffusion plate 5c.

  In addition, since the test | inspection of the press components 10 currently conveyed with the conveyor 2 by the inspection apparatus 1 of Embodiment 2 is the same as that by the inspection apparatus 1 of Embodiment 1, detailed description is abbreviate | omitted.

  As described above, according to the second embodiment of the present invention, since the second illumination tools 5 as in the first embodiment are not separated in the circumferential direction, the entire press part 10 is further compared with the inspection apparatus 1 of the first embodiment. The side surface portion 10b can be uniformly illuminated by the respective red LEDs 5a, and scratches and the like generated on all the side surface portions 10b can be reliably found.

  In the first and second embodiments of the present invention, the first light source is white and the second light source is red. However, the first light source may be red and the second light source may be white. Further, the first and second light sources may be other colors or the same color.

  In the first and second embodiments of the present invention, the CCD camera 3 is used for photographing the press part 10, but a CMOS camera may be used.

  In addition, the photographing speed of the CCD camera 3 used in the first and second embodiments of the present invention is about 0.2 msec. However, in consideration of the size of the press part 10 and the conveyance speed, the CCD camera having other photographing speeds. May be used.

  The present invention is suitable for a press part inspection apparatus that inspects the presence or absence of defects in a press part after molding.

1 test device 2 conveyors <br/> 3 CCD camera 4a white LED (first light source)
5a Red LED (second light source)
6 Control panel (judgment means)
6a Arithmetic unit 6b Storage unit 10 Press part 10a Plane unit 10b Side surface unit

Claims (4)

A conveyor for conveying linearly at a constant speed flat portion and a panel-shaped pressed parts made from the side surface continuous to the flat surface portion periphery by placing in a posture in which the planar portion extends along the conveying direction,
The press part is arranged so that it can be photographed from above perpendicular to the transport direction, and when the press part transported by the conveyor crosses the photographing region, a camera that photographs the press part ,
A first light source that is disposed on the side of the camera and that irradiates light perpendicularly to a flat part of a pressed part that has entered the imaging region of the camera;
A second light source that is arranged on the side of the first light source and irradiates light obliquely to the flat part of the pressed part that has entered the imaging region of the camera;
A calculation unit that calculates an image of a pressed part photographed by the camera, and a storage unit that stores reference data of a surface finish state of the pressed part in advance, and the calculated data of the pressed part processed by the calculating unit and the above An inspection device for a press part, comprising: a determination unit that compares the reference data with each other to determine whether the press part is good or bad. The press part inspection apparatus according to claim 1,
An inspection apparatus for press parts, wherein the illumination colors of the first and second light sources are different. In the inspection apparatus for press parts according to claim 1 or 2,
A plurality of the first light sources are arranged in a ring at a predetermined interval around the camera,
A plurality of the second light sources are arranged in a ring shape on the outer side of each of the first light sources and at a predetermined interval around the camera. The inspection apparatus for press parts according to claim 3,
The press part inspection apparatus, wherein the second light source gradually approaches the conveyor as it goes outward.

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