Welded part inspection device and method

Abstract

The invention provides a welding part inspection device which can easily and reliably judge whether a welding part is good or not while simply shooting a contact part. A welded part inspection device (1) for inspecting a welded part (5) of a stator (3) in which adjacent coil end parts (17) of a plurality of segment coils (10) are joined together by welding, the welded part inspection device (1) being provided with: an imaging unit (23) for imaging the welded part (5); a monitor (25) that is positioned on the opposite side of the imaging unit (23) in the imaging direction with the welding unit (5) therebetween, and that displays a background image (31) of the welding unit (5); and a control unit (27) that causes the monitor (25) to display the background image (31), causes the imaging unit (23) to image the welded part (5) together with the background image (31), and determines the shape of the welded part (5) on the basis of the captured image by comparing the captured image with the background image (31).

Description

Technical Field

[0001] This invention relates to an apparatus and method for inspecting the welded parts of a stator formed by welding adjacent coil ends of multiple segmented coils together. Background Technology

[0002] As an existing weld inspection device, for example, as described in Patent Document 1, there exists a device that includes a camera, a light source, a wavelength conversion plate, a light absorption unit, and a control unit, for inspecting welds formed by joining adjacent coil ends of multiple segmented coils together.

[0003] In this weld inspection device, blue light is shone from a light source onto a wavelength conversion plate located on the back side of the weld. The wavelength conversion plate converts the shone blue light into other wavelengths and reflects it. Therefore, the reflected light shines on the weld from the back side.

[0004] When the camera is backlit onto the welded area, it blocks blue light through a light-absorbing unit while taking a picture of the welded area from the front side. As a result, the control unit can easily and reliably determine the quality of the welded area based on the highlighted outline.

[0005] However, the existing welding inspection equipment described above complicates the methods and procedures for photographing the welding parts.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent No. 6606202 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] The problem to be solved lies in the increased complexity of the methods and procedures for photographing the welding parts.

[0011] Methods for solving problems

[0012] This invention provides a weld inspection apparatus for inspecting welded sections of a stator formed by welding adjacent coil ends of multiple segmented coils together. The weld inspection apparatus includes: an imaging unit that captures images of the welded section; a monitor located opposite the imaging unit to the imaging unit across the welded section and displaying a background image of the welded section; a control unit that causes the monitor to display the background image and causes the imaging unit to capture images of the welded section and the background image together; and a shape determination unit that determines the shape of the welded section by comparing the captured image with the background image.

[0013] Furthermore, the present invention provides a weld inspection method for inspecting welded sections of a stator formed by joining adjacent coil ends of multiple segmented coils together by welding. In this weld inspection method, a background image of the weld is displayed on a monitor located on the opposite side of the imaging direction from an imaging unit that is positioned across the weld. The imaging unit captures an image of the weld along with the background image. Based on the captured image, the shape of the weld is determined by comparing it with the background image.

[0014] Invention Effects

[0015] The welding inspection apparatus and method of the present invention can easily photograph the welding parts and easily and reliably determine whether the welding parts are good or bad. Attached Figure Description

[0016] Figure 1 This is a schematic perspective view of the welding inspection device according to Embodiment 1 of the present invention.

[0017] Figure 2 It means Figure 1 A schematic top view of the welding inspection device.

[0018] Figure 3 Through Figure 1 A schematic perspective view of the stator being inspected by the welding inspection device.

[0019] Figure 4 It means Figure 1 A general front view showing the relationship between the monitor of the welding inspection device and the welding section.

[0020] Figure 5 This is a schematic front view showing the relationship between the monitor and the welded part of the welded part inspection device according to Embodiment 2 of the present invention.

[0021] Figure 6 This is a schematic front view showing the relationship between the monitor and the welded part of the welded part inspection device according to Embodiment 3 of the present invention.

[0022] Figure 7 This is a schematic top view showing the relationship between the monitor and the welded part of the welded part inspection device according to Embodiment 4 of the present invention.

[0023] Figure 8 This is a schematic top view showing the weld inspection device of Embodiment 5 of the present invention. Detailed Implementation

[0024] By using a monitor, it is possible to easily and reliably determine the quality of a weld by simply taking a picture of the weld.

[0025] The welding inspection device 1 is a device for inspecting the welding parts 5 of the stator 3, which is formed by welding adjacent coil ends 17 of multiple segmented coils 10 together. The welding inspection device 1 includes an imaging unit 23, a monitor 25, a control unit 27, and a shape judgment unit 27.

[0026] The imaging unit 23 captures images of the welded part 5. The monitor 25, located on the opposite side of the imaging unit 23 across the welded part 5, displays a background image 31 of the welded part 5. The control unit 27 causes the monitor 25 to display the background image 31, and causes the imaging unit 23 to capture images of the welded part 5 together with the background image 31. The shape determination unit 27 determines the shape of the welded part 5 by comparing the captured image obtained by the imaging unit 23 with the background image 31.

[0027] In one implementation, the control unit 27 can cause the monitor 25 to display multiple background images 31 with different image structures, at least in the area adjacent to the outline 5a of the welded part 5. In this case, the control unit 27 causes the imaging unit 23 to capture images of the welded part 5 together with each of the multiple background images 31. The shape determination unit 27 determines the shape of the welded part 5 based on a composite image 33 obtained by combining the multiple captured images of the multiple background images 31.

[0028] Alternatively, the monitor 25 can also display multiple segmented background images 32 that are divided in a manner that constitutes the background of each of the multiple welded parts 5. In this case, the control unit 27 makes at least one of the multiple welded parts 5 stand out as the subject of the photograph by making the image structures of the multiple segmented background images 32 different.

[0029] In addition, the control unit 27 can also make the monitor 25 display the mark 35 for the welded part 5.

[0030] The monitor 25 is not only planar, but may also have a side 25a that is curved when viewed from above the welded part 5 and is opposite to the welded part 5 in a cross direction relative to the shooting direction.

[0031] The weld inspection method is a method for inspecting the welded portions 5 of the stator 3, which is formed by joining adjacent coil ends 17 of multiple segmented coils 10 together by welding. This weld inspection method displays a background image 31 of the welded portion 5 on a monitor 25 located on the opposite side of the shooting direction from the shooting unit 23, which is positioned across the welded portion 5. Furthermore, the shooting unit 23 captures an image of the welded portion 5 together with the background image 31, and the shape of the welded portion 5 is determined by comparing the captured image with the background image 31.

[0032] In addition, in the welding part inspection method, multiple background images 31 with different image structures can be displayed on the monitor 25 in at least the area adjacent to the outline 5a of the welding part 5. The imaging unit 23 captures the welding part 5 together with each of the multiple background images 31. The shape of the welding part 5 is determined based on the composite image 33 obtained by combining the multiple captured images of the multiple background images 31.

[0033] In addition, in the weld inspection method, multiple segmented background images 32 with different image structures can be displayed on the monitor 25 after being segmented in a manner that constitutes the background of multiple weld parts 5 respectively, and at least one of the multiple weld parts 5 is taken as the subject of the photograph and made more prominent than the other weld parts 5.

[0034] Additionally, markings 35 for the welded portion 5 can be displayed on the monitor 25.

[0035] Example 1

[0036] [Welding Inspection Device]

[0037] Figure 1 This is a schematic perspective view of the welding inspection device according to Embodiment 1 of the present invention. Figure 2 It means Figure 1 A schematic top view of the welding inspection device. Figure 3 Through Figure 1 A schematic perspective view of the stator being inspected by the welding inspection device.

[0038] like Figure 1 as well as Figure 2 As shown, the weld inspection device 1 of this embodiment is a device for inspecting the welded parts 5 of the stator 3. In this embodiment, the stator 3 to be inspected is, for example, as shown in the figure below. Figure 3 That's how it's structured. Furthermore, stator 3 is an example; as long as it has the same welded part 5, it can be the object of inspection.

[0039] The stator 3, together with the rotor (not shown), constitutes a rotating electric motor. For example... Figures 1-3 As shown, the stator 3 has a stator core 7 and a coil 9.

[0040] The stator core 7 is formed into a cylindrical shape by stacking multiple plate-shaped core sheets. On the inner circumference of the stator core 7, multiple slots 11 that are axially through are provided at intervals in the circumferential direction.

[0041] The coil 9 is configured to be wound into a wave-shaped winding on the inner circumference of the stator core 7. The coil 9 is composed of multiple segmented coils 10. The multiple segmented coils 10 are assembled in the circumferential direction of the core 7 to install the multiple segmented coils 10.

[0042] Each segmented coil 10 is formed into, for example, a U-shape, particularly a hairpin shape, by bending a flat wire made of electrical conductor. Thus, the segmented coil 10 has a pair of legs 13.

[0043] A pair of legs 13 are inserted into different slots 11 of the stator core 7. One end of the leg 13 protrudes from the end of the stator core 7 and is tilted relative to the axial direction of the stator core 7 by twisting. The front end of the leg 13 has a coil end 17 extending along the axial direction of the stator core 7.

[0044] In addition, Figure 1 In this context, for ease of understanding, the entire foot 13 reaching the coil end 17 is along the axial direction of the stator core 7.

[0045] The coil end 17 is adjacent to the coil end 17 of other segmented coils 10 and is joined to the coil end 17 of the adjacent other segmented coils 10 by a welding part 5. Multiple groups of joined coil ends 17 are arranged radially within each slot 11. In this embodiment, three groups of coil ends 17 are arranged radially. The welding parts 5 of these three groups are referred to as parallel groups 21.

[0046] Each welded portion 5 is formed by welding to the front end of the group at the coil end 17. Welding can be performed, for example, by laser welding, TIG welding, EB welding, etc. The welded portion 5 is approximately spherical.

[0047] The welding inspection device 1 of this embodiment checks whether the welding is good based on the shape of the welding part 5.

[0048] like Figure 1 as well as Figure 2 As shown, the welding inspection device 1 includes a camera unit 23, a monitor 25, and a control unit 27.

[0049] The imaging unit 23 is an imaging device such as a CCD camera, which captures images of the welded parts 5. In this embodiment, the imaging unit 23 captures images of all three welded parts 5 in a parallel group 21 at a time. Alternatively, the imaging unit 23 can also capture images of a portion of the parallel group 21 at a time, such as one or two welded parts 5.

[0050] The imaging unit 23 photographs the welded portion 5 from an obliquely upward position. The imaging direction refers to the direction along the optical axis of the imaging unit 23, but it does not need to be strictly understood; it simply refers to the direction in which the imaging unit 23 is oriented for the purpose of imaging. This imaging direction is preferably inclined at 15 to 75 degrees relative to the horizontal direction, and more preferably at 30 to 60 degrees. Furthermore, the horizontal direction refers to the horizontal direction when the stator 3 is horizontally positioned. Additionally, when viewed from above, the imaging direction is orthogonal to the parallel direction of the welded portions 5 of the parallel assembly 21 that are the subject of the imaging.

[0051] Figure 4This is a front view showing the relationship between the monitor 25 and the welded part 5 of the object being photographed, as well as the composite image. Additionally, in Figure 4 The illustration also shows a monitor 25 used to display the background image 31 for displaying the different image structures described later, but in reality, a single monitor 25 displays... Figure 4 Multiple background images 31.

[0052] like Figure 1 , Figure 2 as well as Figure 4 As shown, the monitor 25 is a sheet-like display device such as an organic EL or a micro LED. In this embodiment, the monitor 25 is formed into a rectangular sheet shape and is located on the opposite side of the shooting direction (referred to as the back side of the solder joint 5) across the shooting section 23 from the shooting section 23. Thus, the monitor 25 is located on the back side of all the solder joints 5 that are the subject of the shooting. Furthermore, the monitor 25 is not limited to being rectangular, or it may not be sheet-like, as long as it can be located on the back side of all the solder joints 5 that are the subject of the shooting.

[0053] The monitor 25 is positioned within the gap 29 between adjacent parallel groups 21 in the circumferential direction of the stator core 7. With the monitor 25 positioned within the gap 29, the stator 3 is rotated to insert the monitor 25 radially or axially into the gap 29 on the back side of the weld portion 5 positioned at the shooting position. After shooting, the monitor 25 is retracted outward from the gap 29 and inserted into the gap 29 on the back side of the weld portion 5 at the next shooting position after the stator 3 is rotated.

[0054] The monitor 25 displays a background image 31 of the welded part 5 on the back side of the welded part 5. By comparing the background image 31 with the welded part 5 that is being photographed, various background images can be used as long as the shape of the welded part 5 can be determined. Preferably, the background image 31 can emphasize the outline 5a of the welded part 5. In this embodiment, the monitor 25 displays the background image 31 under the control of the control unit 27.

[0055] The control unit 27 is a computer with a processor and memory, which controls the imaging unit 23 and the monitor 25. Through this control, the control unit 27 causes the monitor 25 to display the background image 31, and causes the imaging unit 23 to capture the welding part 5 together with the background image 31.

[0056] As background images 31, multiple background images 31 with different image structures are displayed on the monitor 25, at least in the area adjacent to the outline 5a of the welded part 5. The image structures are achieved through color, and in the different image structures, at least one of hue, brightness, and chroma saturation is different.

[0057] The area adjacent to the outline 5a of the welding part 5 refers to the area in the background image 31 where the outline 5a is trimmed and can be photographed together with the outline 5a of the welding part 5 by the photographing unit 23. To make this adjacent area have a different color, in this embodiment, for example... Figure 4 As shown, the entire area of ​​the monitor 25 is composed of a monochrome background image 31, with the color of the monochrome background image 31 varying. The color of the background image 31 can be changed at predetermined intervals.

[0058] Furthermore, the background image 31 may only differ in color in adjacent areas. In this case, adjacent areas are extracted by performing image recognition based on the images obtained by the imaging unit 23 capturing the background image 31 and the welding unit 5, and the extracted adjacent areas are made to have different colors.

[0059] Background image 31 can also remain fixed without changing its color. In this case, background image 31 may not be a single color, but a combination of multiple colors. Furthermore, background image 31 can be not only a static image, but also a dynamic image. A dynamic image refers to an image that changes not only its color, but also its shape and other aspects.

[0060] The control unit 27 displays the background image 31 and causes the imaging unit 23 to take a picture. That is, the control unit 27 causes the imaging unit 23 to take a picture of the welding part 5 together with each of the background images in the plurality of background images 31. This picture only needs to be taken in sync with the color change of the background image 31.

[0061] In this embodiment, the control unit 27 functions as a shape determination unit. Alternatively, the shape determination unit may be configured as a computer or similar device, different from the control unit 27. The control unit 27 determines the shape of the welding part 5 by comparing the captured image from the imaging unit 23 with the background image 31. In this embodiment, the shape of the welding part 5 is determined based on a composite image 33 obtained by combining multiple captured images of multiple background images 31.

[0062] Furthermore, the shape determination of the welded part 5 is not only performed by computer processing by the control unit 27, but can also be determined by the operator on a monitor for determination, etc.

[0063] [Inspection methods for welded parts]

[0064] In the inspection methods for welded parts, firstly, as follows: Figure 1 as well as Figure 2 As shown, a monitor 25 is installed on the stator 3. When installing the monitor 25, the stator 3 is pre-positioned on a rotating table or similar surface and rotated to the desired position. Through this rotation, the welded portion 5 of the parallel assembly 21, which will be the subject of the photograph, is positioned at the photographing location.

[0065] The monitor 25 is inserted radially or axially into the gap 29 on the back side of the welded part 5, which is positioned at the imaging location on the stator 3. Insertion of the monitor 25 can be performed using a suitable robotic arm or the like. However, the monitor 25 can also be inserted relative to the stator 3 by moving it while the monitor 25 is fixed in place.

[0066] The insertion of the monitor 25 into the gap 29 is completed by positioning the monitor 25 relative to the welded part 5. This positioning is performed so that the monitor 25 is located on the back side of all the welded parts 5 within the parallel group 21 that are to be photographed. At this time, a background image 31 can be displayed on the monitor 25, and the imaging unit 23 captures the position of the welded part 5 relative to the background image 31 on the monitor 25. Based on the captured image, the control unit 27 determines the positioning state of the monitor 25 and can move the monitor 25 to an appropriate position.

[0067] When the monitor 25 is set up in this way, images are taken to determine the shape of the welded part 5. That is, as... Figure 4 As shown, the control unit 27 causes the monitor 25 to continuously display each background image from a plurality of background images 31 with different colors, which are image structures, at predetermined time intervals. Synchronously with the display of the different background images 31, the control unit 27 causes the imaging unit 23 to capture images of the welding unit 5 together with each background image from the plurality of background images 31.

[0068] After taking the picture, the monitor 25 is retracted to the outside of the gap 29. Then, after rotating the stator 3, the monitor 25 is inserted into the back side of the welded part 5 for the next shooting position.

[0069] On the other hand, the control unit 27 determines the shape of the welded part 5 by comparing the captured image with the background image 31. In this embodiment, the shape of the welded part 5 is determined based on a composite image 33 obtained by combining multiple captured images of multiple background images 31 with different colors.

[0070] The method of forming the composite image 33 is not limited, but it is performed in a way that can emphasize the outline 5a of the welded part 5. The emphasized part of the outline 5a of the welded part 5 changes according to the color of the background image 31. Therefore, regarding the composite image 33, for example, the part of each captured image that most emphasizes the outline 5a of the welded part 5 is extracted and these parts are combined to form the composite image 33.

[0071] Therefore, in the composite image 33, the outline 5a of the welded part 5 is emphasized and clarified relative to the background image 31. Furthermore, in the composite image 33, the background image 31 is white and the welded part 5 is black through binarization. In this case, binarization becomes easier if the background image 31 of the composite image is blue, red, and green. However, the composite image 33 may not be a binarized image.

[0072] Based on the composite image 33, the control unit 27 can accurately determine the shape of the welded part 5 and, based on that shape, accurately determine whether the weld is good. Regarding the determination of whether it is good, it is sufficient to judge whether the shape of the welded part 5 is within the range of the shape of a normal product by comparing it with the outline that serves as a reference.

[0073] Furthermore, the shape of a normal product can be displayed in the background image 31 of the monitor 25, and the shape of the welded part 5, which is the subject of the photograph, can be used as a reference to determine whether it falls within the range of the normal product's shape. In this case, the normal product's shape can be displayed overlapping or side by side with the welded part 5.

[0074] As explained above, the weld inspection apparatus 1 and method of this embodiment display a background image 31 on a monitor 25 located on the opposite side of the shooting direction from the imaging unit 23, across the weld 5 which is the object of the photograph. The imaging unit 23 then captures an image of the weld 5 together with the background image 31. The shape of the weld 5 is then determined based on a comparison between the captured image and the background image 31.

[0075] Therefore, in this embodiment, the welded part 5 can be easily photographed using only the monitor 25 and the imaging unit 23, and the shape of the welded part 5 can be reliably identified by comparing it with the background image 31 on the monitor 25. Based on the identified shape of the welded part 5, it is easy and reliable to determine whether the welded part 5 is good or bad.

[0076] Furthermore, in this embodiment, the weld inspection apparatus 1 and method display at least a plurality of background images 31 with different image structures in the area adjacent to the outline 5a of the weld 5. The imaging unit 23 captures images of the weld 5 together with each of these background images 31. Then, the shape of the weld 5 is determined based on the composite image 33 obtained by combining the multiple captured images of the multiple background images 31.

[0077] Therefore, in this embodiment, the emphasized portions of the outline 5a of the welded portion 5 in multiple captured images can be extracted separately and these portions can be combined to form a composite image 33. Thus, in the composite image 33, the outline 5a of the welded portion 5 is emphasized as a whole relative to the background image 31 and becomes clear, making it easier and more reliable to determine whether the welded portion 5 is good or bad.

[0078] Example 2

[0079] Figure 5 This is a schematic front view showing the relationship between the monitor and the welded part of the welded part inspection device according to Embodiment 2 of the present invention. Furthermore, the basic structure of Embodiment 2 is the same as that of Embodiment 1; therefore, the same reference numerals are used for the structures corresponding to those in Embodiment 1, and repeated descriptions are omitted.

[0080] In the weld inspection apparatus 1 and method of Embodiment 2, a mark 35 for the weld 5 of the object to be inspected is displayed on the background image 31 of the monitor 25. This display can be controlled by the control unit 27 (see reference 27). Figure 1 It is controlled by )

[0081] Regarding the shape and number of the mark 35, various shapes and numbers can be used depending on the application, but in this embodiment, a cross-shaped mark 35 is provided. The position of the mark 35 can be various depending on the application, but in this embodiment, it is displayed for positioning the welding part 5. Figure 5 The bottom right of monitor 25.

[0082] In the welding inspection apparatus 1 and method of this embodiment, the positioning between the monitor 25 and the welding part 5 can be achieved by using the mark 35. That is, the imaging unit 23 (refer to...) Figure 1 The welding part 5 is photographed together with a background image 31 having a mark 35, and the monitor 25 is moved based on the photographed image so that the mark 35 and the welding part 5 are in a predetermined positional relationship.

[0083] The movement of monitor 25 can be performed under the control of control unit 27 via a robotic arm or the like, but the operator can move it while recognizing marker 35. Therefore, in this embodiment, not only is the control unit 27 in control, but the operator can also accurately position monitor 25 and stator 3.

[0084] Thus, in this embodiment, the monitor 25 and the welding part 5 can be accurately positioned. Furthermore, after positioning the monitor 25 and the welding part 5, the position (coordinates) of the vertex of the welding part 5 can be accurately determined. As a result, the bending posture, etc., of the leg 13 of the segmented coil 10 can also be determined based on the position of the vertex of the welding part 5.

[0085] Furthermore, in this embodiment, through the accurate positioning between the monitor 25 and the welded part 5, the background image 31 can be displayed without deviation, allowing for comparison with the welded parts 5 in the multiple parallel groups 21. As a result, in this embodiment, the shape of the welded part 5 can be accurately determined without deviation, making it easier and more accurate to judge whether the welded part 5 is good or bad.

[0086] Furthermore, in this embodiment, the same effect as in Embodiment 1 can be achieved.

[0087] Example 3

[0088] Figure 6 This is a front view showing the relationship between the monitor and the welded part of the welded part inspection device according to Embodiment 3 of the present invention. Furthermore, the basic structure of Embodiment 3 is the same as that of Embodiment 1; therefore, the same reference numerals are used for the structures corresponding to those in Embodiment 1, and repeated descriptions are omitted.

[0089] In the weld inspection apparatus 1 and method of Embodiment 3, the monitor 25 displays a plurality of segmented background images 32, which are divided in a manner that constitutes the background of a plurality of weld parts 5. Furthermore, the image structures of the plurality of segmented background images 32 are different. This makes at least one weld part 5 among the plurality of weld parts 5 stand out as the subject of the photograph. The display of the segmented background images 32 and the changes in their image structures can be controlled by the control unit 27 (see reference 1). Figure 1 It is controlled by )

[0090] The segmented background image 32 can be formed through image processing. Specifically, after positioning the monitor 25 and the welding part 5, the imaging part 23 (see reference) is used. Figure 1 The control unit 27 captures a background image 31 and a welding section 5. Based on the captured image, the control unit 27 identifies multiple areas containing each welding section 5 on the monitor 25.

[0091] For each area of ​​these monitors 25, the control unit 27 displays a segmented background image 32. The welded portion 5, which is the subject of the photograph, is made more salient by changing the color of the image structure of the segmented background image 32. Salienting means making it easier to identify.

[0092] In this embodiment, the brightness of the segmented background image 32 is changed as a color change. Specifically, the brightness of the segmented background image 32 is increased relative to the welded portion 5 that is the subject of the photograph, and the brightness of the segmented background image 32 is decreased relative to the remaining welded portion 5.

[0093] Therefore, in the weld inspection device 1 and method of this embodiment, the welded part 5, which is the object of the inspection, can be photographed separately. Furthermore, in this embodiment, it can also achieve the same effect as in Embodiment 1.

[0094] Example 4

[0095] Figure 7 This is a schematic top view showing the relationship between the monitor and the welded part of the welded part inspection device according to Embodiment 4 of the present invention. Furthermore, the basic structure of Embodiment 4 is the same as that of Embodiment 1; therefore, the same reference numerals are used for the structures corresponding to those in Embodiment 1, and repeated descriptions are omitted.

[0096] In the weld inspection apparatus 1 and method of this embodiment, the monitor 25 has a side portion 25a that is curved relative to each weld portion 5 when viewed from above, and is positioned opposite the weld portion 5 in a cross direction relative to the shooting direction. The cross direction is not limited to an orthogonal direction, but also includes a direction that crosses at an angle.

[0097] The monitor 25 in this embodiment has a planar shape that is curved into an arc. However, the monitor 25 may also have other planar shapes such as V-shape or channel shape.

[0098] In this embodiment, not only can the background image 31 be displayed from the back side of each welded part 5 (see reference 31), but also... Figure 4 Furthermore, the background image 31 can be displayed from the side. Therefore, in this embodiment, the shape of the welded part 5 can be more reliably identified by comparing it with the background image 31 on the monitor 25. As a result, it is easier and more reliable to determine whether the welded part 5 is good or bad.

[0099] Example 5

[0100] Figure 8 This is a schematic top view showing the weld inspection device of Embodiment 5 of the present invention. Furthermore, the basic structure of Embodiment 5 is the same as that of Embodiment 1; therefore, the same reference numerals are used for the structures corresponding to Embodiment 1, and repeated descriptions are omitted.

[0101] The weld inspection device 1 of this embodiment captures the shape of the back surface of the weld 25 and is equipped with a pair of monitors 25 and a pair of imaging units 23. Everything else is the same as in Embodiment 1.

[0102] The pair of monitors 25 are of the same structure as the monitor 25 in Embodiment 1. These monitors 25 are arranged in an opposite position within the same gap 29 between adjacent side-by-side groups 21, so that the back faces of the non-displaying background image 31 are opposite to each other.

[0103] Therefore, one side of the monitor 25 is positioned facing circumferentially to the back side of the welded portion 5 of the adjacent group 21, which is the object being photographed. The other side of the monitor 25 is positioned facing circumferentially to the back side of the welded portion 5 of the adjacent group 21, which is the other object being photographed.

[0104] Furthermore, the pair of monitors 25 do not need to be located within the same gap 29 or have their backs facing each other. That is, one monitor 25 can be configured to face one side of the circumference, and the other monitor 25 can be configured to face the other side of the circumference.

[0105] The pair of camera units 23 have the same structure as the camera unit 23 in Embodiment 1, and capture images of the welded portions 5 of adjacent parallel groups 21 from one side and the other side in a circumferential direction against the background of a pair of monitors 25. Thus, one of the pair of camera units 23 captures the welded portions 5 from the surface side, and the other of the pair of camera units 23 captures the welded portions 5 from the back side.

[0106] Therefore, in this embodiment, the shapes of the surface and back of the welded part 5 can be reliably identified, and the quality of the welded part 5 can be determined more reliably. Furthermore, in this embodiment, the same effects as in Embodiment 1 can be achieved.

[0107] Explanation of reference numerals in the attached figures

[0108] 1 Welding Inspection Device

[0109] 3 stators

[0110] 5 Welding section

[0111] 17 coil ends

[0112] 23 Filming Department

[0113] 25 monitors

[0114] 25a side

[0115] 27. Control Unit (Shape Judgment Unit)

[0116] 31 background images

[0117] 33 Composite Images

[0118] Marked with 35.

Claims

1. A welding inspection device for inspecting the welding parts of a stator formed by welding adjacent coil ends of multiple segmented coils together, characterized in that, The welding inspection device includes: The camera unit takes pictures of the welded part; A monitor is located on the opposite side of the shooting direction relative to the shooting part, separated by the welding part, and displays a background image of the welding part; The control unit causes the monitor to display a background image, and the imaging unit to capture an image of the welded part together with the background image; and The shape determination unit determines the shape of the welded part by comparing it with the background image obtained from the captured image.

2. The welding inspection device according to claim 1, characterized in that, The control unit causes the monitor to display multiple background images with different image structures, at least in the area adjacent to the outline of the welded part, and causes the imaging unit to capture images of the welded part together with each of the multiple background images. The shape determination unit determines the shape of the welded part based on a composite image obtained by combining multiple captured images of the multiple background images.

3. The welding inspection device according to claim 1, characterized in that, The control unit causes the monitor to display a plurality of segmented background images that are segmented in a manner that constitutes the background of the plurality of welded parts, and the image structures of the plurality of segmented background images are different, thereby making at least one of the plurality of welded parts stand out as the subject of the photograph compared to the other welded parts.

4. The weld inspection device according to any one of claims 1 to 3, characterized in that, The control unit causes the monitor to display a mark for the welded part.

5. The weld inspection device according to any one of claims 1 to 3, characterized in that, The monitor has a side that is curved when viewed from above the welded portion and is opposite to the welded portion in a cross direction relative to the shooting direction.

6. A method for inspecting welded parts, comprising inspecting the welded parts of a stator formed by welding adjacent coil ends of multiple segmented coils together, characterized in that, A background image of the weld is displayed on a monitor located on the opposite side of the shooting direction from the shooting unit that is positioned across the weld. The welding section and the background image are captured together by the imaging unit. The shape of the welded part is determined by comparing the captured image with the background image.

7. The method for inspecting welded parts according to claim 6, characterized in that, The monitor displays multiple background images with different image structures, at least in the area adjacent to the outline of the weld. The imaging unit captures images of the welding section together with each of the plurality of background images. The shape of the welded part is determined based on a composite image obtained by combining multiple captured images of the multiple background images.

8. The method for inspecting welded parts according to claim 7, characterized in that, The monitor displays multiple segmented background images with different image structures, segmented in a manner that constitutes the background of each of the multiple welded parts. At least one of the multiple welded parts is selected as the subject of the photograph and made more prominent than the other welded parts.

9. The method for inspecting welded parts according to claim 7 or 8, characterized in that, The monitor displays markings for the welded portion.

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