JP7767754B2 - Method and system for indicating paint defects on automobile production lines - Google Patents

Description

The present invention relates to a method and system for indicating paint defects on automobile production lines.

A paint inspection device is known that uses an optical unit including a laser light source to inspect the metallic base painted on an automobile body for uneven brightness and displays the inspection results on a monitor (Patent Document 1).

JP 2017-75848 A

However, the above-mentioned conventional technology only displays paint defects detected by the paint inspection device on a monitor, which means that when repairing a paint defect, it is not possible to confirm whether the repair has been made.

The problem that this invention aims to solve is to provide a method and system for indicating paint defects on automobile production lines that can determine whether or not detected paint defects have been addressed.

The present invention relates to an automobile production line having a defect detection process and a plurality of defect repair processes,
In the defect detection step, a paint defect on the automobile body is detected together with the defect position;
In each of the plurality of defect repair processes, a repair range of the defect to be repaired is assigned to an operator who will repair the coating defect in the respective defect repair process;
assigning to each of the plurality of defect repair processes a wearable device capable of wireless communication of a worker who repairs a paint defect in the defect repair process ;
In each of the defect repair processes, an image showing the surface of the automobile body is displayed on a display of each of the assigned wearable devices, and only the detected paint defects that are included in each of the assigned repair ranges among the paint defects detected in the defect detection process are displayed at the defect positions on the image;
In each of the defect repair processes, measures to be taken for the detected paint defects are entered into a database , and for paint defects for which the measures have been entered, the above problem is solved by ceasing to display them on the image showing the surface of the automobile body or by changing the display format.

According to this invention, for paint defects for which corrective measures have been entered, the display on the image is stopped or the display format is changed, so it is possible to recognize whether the detected paint defect has been corrected.

1 is a process diagram showing a painting completion inspection process to which the painting defect indication method and system for an automobile production line according to the present invention is applied. The upper figure is a side view showing an example of the arrangement of a defect detection device (pattern irradiator and camera) according to the present invention, and the lower figure is a front view showing an example of the movement of the light and dark pattern projected on the pattern irradiator. 1 is a block diagram showing an example of a method for detecting a coating defect according to the present invention. 1 is a front view showing an example of a display device according to the present invention. 5 is a diagram for explaining a display function of the display device of FIG. 4. FIG. FIG. 2 is a plan view of a roof panel and a hood panel showing an example of an auxiliary line according to the present invention. 1 is a flowchart showing the procedure of a painting completion inspection process to which the painting defect indication method and system for an automobile production line according to the present invention is applied.

The following describes exemplary embodiments of the present invention with reference to the drawings. An automobile production line is primarily composed of a press-forming line, a body assembly line (also called a welding line), a painting line, and a vehicle assembly line (also called an outfitting line). The paint defect indication method and system for an automobile production line of the present invention can be applied to either a painting line or a vehicle assembly line. Furthermore, the paint defect indication method and system for an automobile production line of the present invention can be applied to a painting line, not only to the paint completion inspection process after topcoat painting is completed, but also to processes after electrodeposition painting and after intermediate coating. For example, a painting line using a three-coat, three-bake painting method (electrodeposition painting, intermediate coating, and topcoat painting) includes an electrodeposition process, a sealing process, an intermediate coating process, a water sanding process, a topcoat process, and an intermediate coating inspection process. The embodiment described below is an example of applying the present invention to the paint completion inspection process after topcoat painting is completed.

Figure 1 is a process diagram showing the painting completion inspection process 1 to which a paint defect indication method and system for an automobile production line is applied. In the figure, an automobile body B is loaded onto a painting cart (not shown) and pulled by a floor conveyor CV1, transporting it at a constant speed from the left side to the right side of Figure 1. Although not shown, a topcoat drying oven is provided on the left side of Figure 1, and a transport device to the vehicle assembly line is provided on the right side of Figure 1.

The paint completion inspection process 1 shown in Figure 1 includes a defect detection process 11 that detects paint defects that occur on the exterior surface of the automobile body B, a first defect repair process 12 that mainly repairs paint defects within the line, and a second defect repair process 13 that mainly repairs paint defects outside the line. Note that paint defects in this embodiment include surface irregularity defects such as dust particles, popliteal particles, threads, and cissing. The paint defect is shown as paint defect D in Figure 4.

The defect detection process 11 is a process for detecting whether or not there are paint defects on the outer panels of the transported automobile body B. In this embodiment, a defect detection device 2 is provided that automatically detects uneven defects on the outer panel surface of the automobile body B. The defect detection device 2 in this embodiment includes a pattern irradiator 21, a camera 22, a computer 23 having the functions of an image processor, a judger, and a controller that identifies the location of defects, and a robot R.

The pattern irradiator 21 is composed of a liquid crystal display, organic EL display, or the like, and irradiates a light-dark pattern, in which light and dark areas alternate periodically in a plane perpendicular to the irradiation direction, onto the exterior surface of the automobile body B, and moves the light-dark pattern in the direction of alignment of the light and dark areas by one or more periods of a pair of light and dark areas. The upper diagram in Figure 2 is a side view showing an example of the arrangement of the pattern irradiator 21 and camera 22 relative to the exterior surface of the automobile body B, and the lower diagram in Figure 2 is a front view showing an example of the movement of the light-dark pattern projected on the pattern irradiator 21.

The light-dark pattern in this embodiment is a continuous striped pattern consisting of a pair (one cycle) of rectangular light areas Pa extending vertically on the screen and rectangular dark areas Pb also extending vertically on the screen. When inspecting for paint defects, this light-dark pattern is moved in the direction in which the light areas Pa and dark areas Pb are aligned, i.e., left and right in the lower diagram of Figure 2. The movement speed is set according to the shooting speed (number of frames shot per unit time, fps) of the camera 22. In this embodiment, when inspecting for paint defects, the light areas Pa and dark areas Pb are moved at least one cycle, and preferably two or more cycles, on the exterior surface of a single automobile body B.

Photographer 22 is composed of a CCD camera or the like, and is attached to pattern irradiator 21 so that the light reflected from the exterior surface of automobile body B of the light and dark pattern irradiated by pattern irradiator 21 is incident at a predetermined angle, as shown in the upper diagram of Figure 2. Photographer 22 then takes multiple images of the light and dark pattern projected onto the exterior surface of automobile body B by pattern irradiator 21, in accordance with the movement of the light and dark pattern of pattern irradiator 21. The images of the light and dark pattern taken by photographer 22 are output to computer 23, which has the functions of an image processor, a judger, and a controller that identifies the location of defects.

The computer 23 functions as an image processor that extracts the maximum and minimum brightness values for each position from the multiple images captured by the camera 22 to generate maximum and minimum brightness images; a judger that calculates the difference between the maximum and minimum brightness images and determines whether the brightness difference at each position is within a specified range; and a controller that identifies the location of defects. Specifically, image processing software, judgment software, and location identification software are installed, and predetermined processing is performed in accordance with the procedures of these software by computing units such as a CPU, ROM, and RAM.

Robot R is equipped with a pattern irradiator 21 and a camera 22 attached to the tip of its hand, and a teaching program is installed so that the pattern irradiator 21 and camera 22 are transported in a predetermined orientation relative to the outer surface of automobile body B. Figure 1 shows a total of four robots R, two on each side of automobile body B. These four robots R detect paint defects on five surfaces of automobile body B (hood, roof, trunk lid (back door), left and right body sides).

Figure 3 is a block diagram showing an example of a paint defect detection method according to the present invention. As shown in Figure 3, a computer 23 installed with an image processing program imports images IM1 captured by a camera 22 and extracts the maximum brightness at each position from the multiple images IM1 to generate a maximum brightness image IM2. To extract the maximum brightness at each position from the multiple images IM1, the computer 23 detects the brightness of each pixel (or a pixel group consisting of a predetermined number of pixels) in each image IM1 and combines the pixels with the maximum brightness for each pixel into a single image. Also, as shown in Figure 3, the computer 23 extracts the minimum brightness at each position from the multiple images IM1 it has imported to generate a minimum brightness image IM3. To extract the minimum brightness at each position from the multiple images IM1, the computer 23 detects the brightness of each pixel (or a pixel group consisting of a predetermined number of pixels) in each image IM1 and combines the pixels with the minimum brightness for each pixel into a single image.

Once the minimum brightness image IM3 is synthesized from multiple captured images IM1 in this way, a difference process is performed to determine the difference in brightness at each position (each pixel) with the maximum brightness image IM2, which was synthesized simultaneously or laterally, to generate a difference image IM4. Each pixel (or pixel group, a collection of a predetermined number of pixels) in the difference image IM4 is then scanned vertically and horizontally to measure the brightness of each pixel (corresponding to a position on the inspected surface) and determine whether it is above a predetermined threshold. If the measured brightness is below the threshold, it is determined that a concave-convex defect exists at that position. This determination is based on diffuse reflection from the concave-convex surfaces. That is, due to diffuse reflection from the concave-convex surfaces, the brightness of an image of the pattern of the bright areas Pa exhibits a gray value between white and black, and the brightness of an image of the pattern of the dark areas Pb also exhibits a gray value between black and white, so the difference in brightness decreases toward zero.

When a position below the threshold is detected by scanning each pixel (each position) in the difference image IM4, that position is stored and the defect position is identified. The defect detection results are compiled as defect data for one automobile body B when defect detection for the entire automobile body B is completed, and output to the production management device 3 in Figure 1. The defect position in automobile body B can be identified by capturing the position of the outer panel surface of automobile body B moved by robot R from the controller of robot R and comparing this position with the defect position determined by computer 33.

The defect detection device 2 provided in the defect detection process 11 is not limited to the one described above, and other defect detection devices that automatically detect paint defects can also be applied. Furthermore, it is not limited to devices that automatically detect paint defects, and may be a defect detection device that detects paint defects in collaboration with an operator. For example, since the so-called interior surfaces of an automobile body, such as the door openings, back door openings, and engine compartment, have complex shapes, the interior surfaces can be visually inspected by an operator, and the exterior surfaces can be inspected mechanically (by an automatic defect detection device).

Returning to Figure 1, the first defect repair process 12 is a process for repairing paint defects within the line, and for this purpose, two workers W are assigned to an automobile body B corresponding to one takt time. The production management device 3 records the ordered vehicle along with its specifications, and when the vehicle begins production on the automobile production line, production of that vehicle is managed as tracking data across all of the body assembly line, painting line, and vehicle assembly line. This tracking data is then associated with paint defects detected by the defect detection device 2, along with their location. Therefore, when an automobile body B is brought into the first defect repair process 12, the paint defects detected on the automobile body B at that time are output from the production management device 3 to the display device 4 via the wireless router 31, along with the defect location, allowing each worker W to recognize the paint defects on the automobile body B that has arrived in their work area.

In this embodiment, the display device 4 is a so-called wearable small computer that can be worn by the worker W on a part of the body, such as the arm, and includes a display 41. In the first stage of the first defect repair process 12 shown in FIG. 1, two workers W repair paint defects on the left and right sides of the automobile body B. In the subsequent stage of the first defect repair process 12, two other workers W repair other paint defects on the left and right sides of the automobile body B. In this embodiment, the first defect repair process 12 has two stages, but one stage or three or more stages may be provided as needed. Furthermore, the first defect repair process 12 is a process in which the worker W repairs paint defects detected by the defect detection device 2 within the line. However, the worker W may also determine whether the paint defects detected by the defect detection device 2 are correct or visually detect paint defects not detected by the defect detection device 2.

The second defect repair process 13 is a process that primarily repairs paint defects off-line, and is located on the bypass line of the floor conveyor CV1 downstream of the first defect repair process 12. If a worker W visually checks a paint defect in the first defect repair process 12 and determines that the paint defect is "uncorrectable" and registers it, the automobile body B is transported from the floor conveyor CV1 to CV2, where the paint defect is repaired over a relatively long period of time. For this reason, the floor conveyor CV2 does not transport the automobile body at a constant speed, but is manually transported to transport the automobile body at the desired timing. The second defect repair process 13 may also be an off-line repair space without a floor conveyor.

Figure 4 is a front view showing an example of a display device 4 according to the present invention. The display device 4 of this embodiment has a display 41 on one of its main surfaces, and is equipped with a defect display function for displaying paint defects and a correction result input function for inputting the results of correcting paint defects.

The defect display function of display device 4 displays selected vehicle information, plots and displays defects of the selected vehicle on a three-dimensional vehicle set based on defect database information, and further displays information about the selected defect and an enlarged view of the sub-part screen. A worker W wearing display device 4 can visually identify defects displayed on display 41 and then perform subsequent work.

The display device 4 also has a correction result input function that registers the correction information and results of a selected defect in a database, and corrects the defect level and type of the selected defect and registers it in the database. If worker W corrects a paint defect identified on an actual vehicle, determines that correction is not necessary, or determines that correction is impossible, he or she can register the defect correction information and results in the database. Furthermore, by visually checking the paint defect detected by the defect detection device 2, the defect level and defect type can be identified, and this information can also be corrected.

In addition to these defect display and correction result input functions, the display device 4 of this embodiment also has the following functions: registering and displaying auxiliary lines; zooming in, out, and moving the display; switching the viewpoint of the image display; setting a correction range for each work area (or worker W) and displaying or inputting corrections for only defects within the set correction range; setting a work area for each display device 4 and displaying based on the set work area; setting a worker for each work area and associating defect correction information with the worker; switching defect selection by touching the defect switching button and defect symbol; and registering three-dimensional vehicle data and associated information used for image display. The configuration of the display device 4, including these functions, is described below.

As shown in Figure 4, the display device 4 of this embodiment displays a main screen 42 on the left and a sub-parts screen 43 on the right. The upper part 421 of the main screen 42 displays selected vehicle information. This vehicle information is output from the production management device 3. Note that the vehicle to be displayed on the display device 4 can be selected by the worker W operating the display device 4, but while the line is in operation, the vehicle information of the automobile body B that has arrived in the worker W's work area is automatically selected and displayed based on the tracking data from the production management device 3.

The central section 422 of the main screen 42 displays five views of the automobile body B: plan view, front view, rear view, right side view, and left side view. Superimposed on these images are auxiliary lines L and paint defects D. The lower section 423 of the main screen 42 also displays the defect level and defect type of the paint defect D. The defect level is, for example, a predetermined N-level evaluation, and the defect types include dust particles, flaking, thread waste, and repelling. The numbers in parentheses to the right of the defect type indicate the selected defect number and the total number of defects registered in the work area of that worker W. For example, 1/3 means that the total number of defects registered in the work area of that worker W is 3, and the currently selected defect number is 1.

By touching any of the five-view drawings displayed in the center 422 of the main screen 42, the corresponding subassembly part is displayed on the sub-parts screen 43. Figure 4 shows the case where the left side of the hood is touched on the main screen 42.

The sub-assembly part selected on the main screen 42 is displayed in the center of the sub-parts screen 43. When worker W pinches out on the sub-parts screen 43 (moving two fingers apart), the displayed sub-assembly part is enlarged. Conversely, when worker W pinches in on the sub-parts screen 43 (moving two fingers closer together), the displayed sub-assembly part is reduced. In addition, when worker W scrolls the sub-parts screen 43, the display screen is scrolled in the direction of the finger movement.

The "Previous" and "Next" touch buttons are displayed on the upper left and right sides 431 of the sub-parts screen 43; touching "Previous" will transition to vehicle information for the preceding vehicle, and touching "Next" will transition to vehicle information for the following vehicle. The "Previous" and "Next" touch buttons are also displayed on the lower left and right sides 432 of the sub-parts screen 43; touching "Previous" will move the highlight (such as a red circle) of the multiple paint defects D to the previous paint defect D; touching "Next" will transition to the next paint defect D.

The bottom 433 of the subpart screen 43 displays touch buttons for "Corrected," "Cannot be corrected," and "No correction required." This is the correction result input function described above. When a worker completes the correction of a highlighted paint defect D, they touch "Corrected." However, if the worker examines the actual vehicle and determines that the paint defect D cannot be corrected within the production line, they touch "Cannot be corrected." If the paint defect D is detected but the worker examines the actual vehicle and determines that correction is not required, they touch "No correction required." When "Corrected," "Cannot be corrected," or "No correction required" is entered for a paint defect D, the display of that paint defect D is discontinued, or, instead, the display format is changed to indicate that the entry has been made. Changing the display format includes changing the color of the paint defect display or the format of the highlight mark. In contrast, if none of "Corrected," "Cannot be corrected," or "No correction required" is entered for a paint defect D, the display of that paint defect D continues even after it has passed the assigned worker W's work area.

Eight arrow-shaped touch buttons are displayed on the outer periphery 434 of the sub-parts screen 43, and touching one of the arrow-shaped touch buttons displays a three-dimensional image viewed from the direction of the arrow. Figure 5 shows an example of a three-dimensional image displayed when each arrow-shaped touch button is touched, in the form of a balloon. If a paint defect on the actual vehicle cannot be found or is difficult to find, changing the line of sight can make it easier to find.

In this embodiment, the display device 4 uses an auxiliary line display function to display auxiliary lines L superimposed on the image of the five-view drawing displayed on the main screen 42 and the image of the sub-assembly part displayed on the sub-parts screen 43. In this embodiment, the auxiliary lines L are preferably straight lines that pass through characteristic points of the automobile body B and run along the front-to-back, left-to-right, or up-to-down directions of the automobile body. Furthermore, it is desirable that these characteristic points be landmarks that can be used to confirm any position, such as the end points of the sub-assembly parts, character lines, holes, notches, or the center points of arch shapes, and that are easily distinguishable from others. Figure 6 is a plan view of a roof panel and a hood panel showing an example of auxiliary lines.

In the case of the roof panel shown in the left diagram of Figure 6, auxiliary line L1, which extends in the longitudinal direction of the vehicle and passes through the center of the vehicle in the lateral direction, is a straight line that passes through a characteristic point, the center of the vehicle body B in the lateral direction. Furthermore, auxiliary line L2, which also extends in the lateral direction of the vehicle, is a straight line that passes through a characteristic point, where both ends of the auxiliary line L2 coincide with the rear ends of the rear door. Furthermore, auxiliary line L3, which also extends in the lateral direction of the vehicle, is a straight line that passes through a characteristic point, where both ends of the auxiliary line L3 coincide with the top ends of the center pillar. When the roof panel is visually recognized, these auxiliary lines L1 to L3 serve as landmarks for recognizing relative positions.

Similarly, in the case of the hood panel in Figure 6, auxiliary line L4, which extends in the longitudinal direction of the vehicle and passes through the left-right center of the vehicle, is a straight line that passes through a characteristic point, the left-right center of automobile body B. Furthermore, auxiliary line L5, which extends in the left-right direction of the vehicle, is a straight line that passes through a characteristic point, where both ends of the line coincide with the center of the front wheel arch. Furthermore, auxiliary line L6, which extends in the left-right direction of the vehicle, is a straight line that passes through a characteristic point, where both ends of the line coincide with the cutout portion of the front fender. When the hood panel is visually observed, these auxiliary lines L4 to L6 serve as landmarks for recognizing relative positions.

Next, the operation will be explained. Figure 7 is a flowchart showing the work procedure in the painting completion inspection process of this embodiment. First, in step ST1, when the automobile body B arrives at the defect detection process 11 of the painting completion inspection process 1, the vehicle ID is recognized using tracking data from the production management device 3. Then, in step ST2, the defect detection device 2 automatically detects paint defects present on the outer panel surface of the automobile body B, i.e., surface irregularity defects such as dust particles, popliteal particles, thread debris, and repelling. In step ST3, the presence or absence of paint defects and their locations are identified, and the paint defects and their locations are output from the computer 23 to the production management device 3, where they are recorded in association with vehicle information.

When the automobile body B that has passed through the defect detection process 11 arrives at the stage preceding the first defect repair process 12, in step ST4, the paint defects D detected on the automobile body B, along with their locations, are displayed on the display devices 4 worn by the four workers W positioned preceding and following the first defect repair process 12 via the production management device 3 via the wireless router 31. At this time, a preset auxiliary line L is also displayed superimposed on the image of the automobile body B.

In step ST5, the four workers W, who are stationed before and after the first defect repair process 12, compare the paint defect D displayed on the display device 4 with the paint defect on the actual vehicle, confirm the defect level and type, and correct it as necessary before registering it. If the paint defect can be corrected within the line and the correction is complete, the worker touches the "Corrected" touch button. If the paint defect is determined to be minor and does not require correction, or is a false detection and does not require correction, the worker touches the "No correction required" touch button. If the paint defect cannot be corrected within the line and the worker determines that correction is required in the second defect repair process 13, the worker touches the "Cannot be corrected" touch button.

Once the takt time for worker W has elapsed, step ST6 determines whether all correction results, such as "corrected," "uncorrectable," or "no correction required," have been entered for the painting defects detected in step ST2 and assigned to each worker W. If correction results have not been entered for the assigned painting defects, the work of that worker W has not been completed, and so the process proceeds to step ST7, prohibiting transport to the vehicle assembly line, which is the process following the painting completion inspection process 1. This prevents worker W's work errors from being overlooked.

On the other hand, if in step ST6, the correction results "corrected," "uncorrectable," or "no correction required" have all been entered for the painting defects detected in step ST2 and assigned to each worker W, the process proceeds to step ST8. If the entered result in step ST8 is "corrected" or "no correction required," the process proceeds to step ST10; if the entered result is "uncorrectable," the process proceeds to step ST9.

In step ST9, the automobile body B for which the result "cannot be corrected" has been input is transported to the second defect correction process 13, where the paint defects that cannot be corrected on the line are corrected, and the result is input as "corrected."

In step ST10, for paint defects for which "corrected" or "no correction required" has been entered, display on display device 4 is discontinued. Then, in step ST, transportation to the vehicle assembly line is permitted.

As described above, the paint defect display method and system for an automobile production line of this embodiment detects paint defects D on an automobile body B along with their locations, displays the detected paint defects D at the defect locations on an image showing the surface of the automobile body B, and, when a remedial action is input for a detected paint defect, stops displaying the paint defect D on the image showing the surface of the automobile body B for which a remedial action has been input. This allows the worker W to easily recognize whether or not the detected paint defect has been remediated.

Furthermore, according to the paint defect display method and system for an automobile production line of this embodiment, paint defects D on an automobile body B are detected along with their locations, and the detected paint defects D are displayed at the defect locations on an image showing the surface of the automobile body B. When an action to address the detected paint defects is input, the display format on the image showing the surface of the automobile body B is changed for the paint defects D for which an action has been input. This allows worker W to easily recognize whether or not the detected paint defects have been addressed. In addition, because the display continues even after the action has been input, re-action by the same worker or double-checking by another worker is possible.

Furthermore, according to the paint defect display method and system for an automobile production line of this embodiment, paint defect D displayed on an image showing the surface of automobile body B continues to be displayed until the above-mentioned measures are input, making it even easier for worker W to recognize whether the detected paint defect has been addressed.

Furthermore, according to the paint defect display method and system for automobile production lines of this embodiment, the action can be selected as either corrected, no correction required, or uncorrectable, so the worker W can more easily recognize whether or not the detected paint defect has been corrected.

Furthermore, according to the paint defect display method and system for an automobile production line of this embodiment, an image showing the surface of the automobile body, including the paint defect and the auxiliary line, is displayed on the display of a wirelessly-enabled wearable display device, so it can be recognized without significantly changing one's line of sight. This makes it even easier for worker W to recognize whether or not the detected paint defect has been addressed.

1...Painting inspection process (automobile production line)
11...Defect detection process 12...First defect repair process 13...Second defect repair process 2...Defect detection device 21...Pattern irradiator 22...Photographer 23...Computer 3...Production management device 31...Wireless router 4...Display device 41...Display 42...Main screen 421...Upper part 422...Central part 423...Lower part 43...Sub-parts screen 431...Upper left and right 432...Lower left and right 433...Lower part 434...Outer periphery B...Automobile body CV1, CV2...Floor conveyor R...Robot W...Worker D...Painting defect L, L1 to L6...Auxiliary line

Claims (3)

In an automobile production line that has a defect detection process and multiple defect repair processes,
In the defect detection step, a paint defect on the automobile body is detected together with the defect position;
Before each of the plurality of defect repair processes, a repair range of the defect to be repaired is assigned to an operator who will repair the coating defect in each of the defect repair processes;
assigning to each of the plurality of defect repair processes a wearable device capable of wireless communication of a worker who repairs a paint defect in the defect repair process ;
In each of the defect repair processes, an image showing the surface of the automobile body is displayed on a display of each of the assigned wearable devices, and only the detected paint defects that are included in each of the assigned repair ranges among the paint defects detected in the defect detection process are displayed at the defect positions on the image;
A paint defect display method for an automobile production line, in which in each defect repair process, measures to be taken for the detected paint defects are entered into a database , and for paint defects for which the measures have been entered, the display on the image showing the surface of the automobile body is stopped or the display format is changed. A paint defect display method for an automobile production line as described in claim 1, wherein paint defects displayed on an image showing the surface of the automobile body continue to be displayed until the corrective action is input. In an automobile production line having a defect detection process and a plurality of defect repair processes, a repair range of a defect to be repaired is assigned to each of the plurality of defect repair processes,
a defect detection device provided in the defect detection process for detecting paint defects on the automobile body and their locations;
a wearable device capable of wireless communication, which is assigned to each of the plurality of defect repair processes, and which inputs measures to be taken for the paint defects and displays the paint defects detected by the defect detection device on a display;
an image showing the surface of the automobile body is displayed on a display of each of the wearable devices assigned to each of the defect repair processes, and only the detected paint defects detected in the defect detection process that are included in each of the assigned repair ranges are displayed at the defect positions on the image;
A paint defect display system for an automobile production line that stops displaying or changes the display format on an image showing the surface of the automobile body for paint defects for which the action has been input by the wearable device .