JP2011154463A - Failure analysis device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To clarify the factor of a failure in order to prevent its reoccurrence. <P>SOLUTION: A failure analysis device 1 is installed in a manufacturing line having a plurality of operation processes 10 and an inspection process 20 at the downstream side of the plurality of operation processes 10, and provided with: an image pickup means (fixed camera 60, compact camera 70) for imaging an operating state in the prescribed operation process 10 among the plurality of operation processes 10; a storage means 80 for storing a plurality of video data captured by the imaging means; and a selection means for, when any failure is found out by the inspection process 20, selecting the video data on which the operating state in the prescribed operation process of a workpiece W in which any failure has occurred is projected from among the plurality of video data stored in the storage means 80. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a failure analysis apparatus, and more particularly to an analysis technique for elucidating the cause of occurrence of a failure found in an inspection process provided in a production line.

  For example, as shown in Patent Document 1 and Patent Document 2 below, the work process in the production line usually includes the presence or absence of work defects (such as improper assembly, processing errors, or scratches generated during work). An inspection process (also called a quality gate) for inspection is provided. If the above-mentioned defects are found in this inspection process, the person in charge of inspection inputs the information about the detected defects to a computer etc. and manages it as defect information. I try to make improvements.

  Specifically, in Patent Document 1 below, in the vehicle assembly line, the assembly line is divided into a plurality of functional zones, and at the end of each functional zone, an inspection unit that performs a static inspection of the vehicle, There is a repair section that performs repairs based on defect information discovered by this inspection section, and a composite warranty zone that combines the inspection and repair items of each functional zone at the end of the assembly line. Are listed. At this time, defect information and repair data in each functional zone and repair data in the combined warranty zone are fed back to all production-related departments including the repair department or assembly process through a computer LAN network or the like. Thus, it is described that the countermeasure (contents of repair) of the defect can be immediately reflected in the assembly, and quality can be stabilized at an early stage from the start of production.

  Further, in Patent Document 2 below, the input of a defect item (defect information) from the inspection terminal assists the part term indicating the part in which the defect occurred, the phenomenon term indicating the phenomenon of the defect content, and the above-described defect phenomenon. The defect information input device performed by the combination with the supplementary term is described. The defect information input in the inspection process is stored in the inspection host computer corresponding to the transported vehicle, and is displayed appropriately in the reworking process located downstream from the inspection process of the production line. Displayed on the terminal. It is described that the rework operator confirms this display and reworkes the corresponding part.

JP 2004-90924 A JP-A-7-149268

  By the way, in order to prevent the reoccurrence of the above defects, it is not enough to create a database of defect information found in the inspection process, and the details are actually fed back to the workers in each work process. It is thought that it is necessary to clarify the cause of the occurrence after taking into consideration the working state and working environment. Here, as described in Patent Document 1, the content of the defect fed back from the inspector to the operator is converted into data by inputting the content of the defect into the data input device. be able to. Moreover, since it can input while seeing an actual malfunction, the content of the malfunction can be input in detail as described in Patent Document 2 above. However, at the time when the operator himself knew that there was a problem due to feedback from the inspection process, several minutes have already passed since the work where the problem seems to have actually occurred was performed. For this reason, the worker often has little memory (cannot remember in detail) about the contents of the work or the state at the time of work. Therefore, when the conventional equipment / method is adopted, the cause of the failure (for example, a deficiency in the way of holding the work or tool or the work procedure, etc.) should be ensured regardless of the type of failure. It was difficult to know, and it was not possible to properly improve (prevent) recurrence by feedback of defect information.

  In view of the above circumstances, it is a technical problem to be solved by the present invention to clarify the cause of a failure and prevent its recurrence.

  The solution to the above problem is achieved by the failure analysis apparatus according to the present invention. That is, this analysis apparatus is an apparatus for analyzing defects occurring in a workpiece in a production line having a plurality of work processes and having an inspection process downstream of the plurality of work processes, Among a plurality of work processes, an image pickup means for picking up a work state in a predetermined work process, a storage means for storing a plurality of video data obtained by the image pickup means, and a storage means when a defect is found in the inspection process And a selection means for selecting video data showing a work state in a work process of a work in which a failure has occurred, from a plurality of video data stored in

  As described above, in the present invention, an image pickup unit such as a camera is provided in advance in a work process in which work troubles are likely or likely to occur, and a plurality of video data obtained by the image pickup unit is stored. By storing in the means, when a trouble is found, the video data at the time of the trouble occurrence selected by the selection means can be browsed. Therefore, if a display device (display) for browsing is placed in the vicinity of the person in charge of the inspection, the details of the specific problem and the work status at that time (work accuracy, work order, placement mode of work tools, etc.) ) Together, it becomes possible to elucidate the cause of the problem at a much higher rate than in the past. Also, at this time, by storing the details of the specific faults together with the video data at that time, it is possible to statistically grasp the cause of the fault and take more appropriate measures to prevent recurrence. It is also possible to take.

  In this case, specifically, the storage means has a temporary storage area capable of temporarily storing video data and a main storage area capable of permanently storing video data, and the selection means includes: When a defect is found in the inspection process, the video data in the work process of the work where the defect has occurred is selected from the multiple video data stored in the temporary storage area, and the selected video data is stored in the main memory. You may make it memorize | store in an area | region.

  As described above, the video data showing the work state at the time of the occurrence of the malfunction is very important information for identifying the cause of the malfunction, but this kind of malfunction naturally occurs at any time. Therefore, it is necessary to capture and store the work states of all the workpieces that basically flow into the imaging target process. However, if all the captured image data is stored, the storage capacity is enormous and storage is troublesome. In addition, since there is no value to memorize the imaged data that shows the working state where no problem has occurred, it can be quickly deleted when it is determined as unnecessary data in order to secure capacity. Better. In view of the above points, according to the present invention, as described above, the storage unit is composed of two areas, the temporary storage area and the main storage area, and if necessary, that is, only for a work in which a defect is found. The video data showing the corresponding work status is stored in this storage area. In this way, it is possible to select and store only video data necessary for elucidating the cause of the failure. In addition, it is possible to avoid useless and enormous accumulation of data by erasing video data that is found to be unnecessary as needed.

  Further, in this case, the temporary storage area can store the same number of video data as the number of steps from a predetermined work process to the inspection process, and the storage unit temporarily stores the latest video data by the imaging unit. The oldest video data is deleted from the same number of video data as the number of processes stored in the storage area, and the selection means selects the oldest video data when a defect is found, and the selected video data May be stored in the main storage area before being deleted from the temporary storage area.

  In this way, the temporary storage area can store the same number of video data as the number of steps from the predetermined work process to the inspection process to be imaged, and the number of video data stored in the temporary storage area reaches the predetermined number. In this case, the oldest video data is deleted and stored in the main storage area as necessary, so that only the video data that can be stored in the main storage area is always stored in the temporary storage area. If necessary, the corresponding video data can be quickly stored permanently. This makes it possible to select and store only truly necessary video data with a minimum storage capacity. In addition, as described above, by limiting the number of video data that can be stored in the temporary storage area to the same number as the number of steps from the work process to the imaging process to the imaging process, when a defect is discovered in the inspection process The video data that is likely to show the working state at the time of the occurrence of the malfunction is always the oldest video data among the plurality of video data stored in the temporary storage area. Therefore, if only this time information is left, it is possible to reliably select video data at the time of occurrence of a problem while reducing the capacity of the video data as much as possible.

  As described above, the selecting means is the video data corresponding to the video data stored in the storage means at the time of finding the defect, that is, the video showing the work state in the predetermined work process of the work in which the trouble has occurred. When selecting the data and selecting the video data from the temporary storage area and storing it in the main storage area, a program for instructing the storage means to perform the selection storage operation is included. Here, in addition to the command program, the selection unit may include a trigger for transmitting an execution command to the command program when a problem is found. The “trigger” here is a signal for instructing (instructing) execution of the command program directly or indirectly by a simple operation of a predetermined person in charge (usually the person in charge of the inspection process). This means means for sending to the command program, and the signal transmission medium is not particularly limited. For example, a command program that is separated from the trigger through electromagnetic waves may be instructed to execute it, such as a keyboard of a personal computer, a predetermined switch, or a button. Or, the tension force of the operator (inspector) is provided along a manufacturing line, such as a string-like switch having one end connected to a command signal transmitter that transmits a predetermined command signal to the command program. The input signal may be configured to instruct the command program to execute it indirectly.

  By configuring in this way, for example, when a workpiece having a defect flows into the inspection process, and the inspector finds the defect, the inspector simply pulls (operates) the trigger, It is possible to automatically select only the work video data of the work in which the defect has occurred and store it in this storage area. For this reason, the inspector does not have to save or burden the storage operation in the main storage area.

  Moreover, when the video data in the work process of the work in which a defect is found in the inspection process and the defect has occurred are stored in this storage area, the environmental conditions may also be stored. The term “environmental condition” as used herein refers to general environmental factors that may be involved in some way in a predetermined work process to be imaged. For example, the vehicle type information, whether or not the conveyor is movable, In addition to information directly related to the production line, information on the person who actually engaged in the work, such as the age of the worker in charge, physical condition at that time, or proficiency level, is included.

  As described above, the work video data when the trouble occurs is stored, and the environmental conditions at that time are also stored in this storage area, so that the work situation (work environment) at the time of the trouble is also taken into consideration. You can check the work video when a problem occurs. As a result, the cause of the occurrence of the failure can be immediately and easily clarified.

  The solution to the above problem is also achieved by the failure analysis method according to the present invention. That is, this analysis method is a method for analyzing defects occurring in a workpiece in a production line having a plurality of work steps and having an inspection step downstream of the plurality of work steps, Among a plurality of work processes, the work state in a predetermined work process is imaged, and a plurality of video data obtained by the imaging is stored, and when a defect is found in the inspection process, the stored plurality From the video data, the video data showing the work state in the work process of the work in which the defect has occurred is selected and analyzed based on the selected video data.

  Since the above analysis method also has the same technical features as the analysis device described at the beginning of this section, the same operation effect as the above can be obtained.

  As described above, according to the failure analysis apparatus and the analysis method according to the present invention, it is possible to clarify the cause of the failure and prevent the recurrence thereof. In addition, when planning a new process, it is possible to take measures to prevent problems before they occur. By showing video data showing the work status at the time of defects to workers, it is possible to improve work quality. It can also be used for education.

It is a figure which shows notionally the whole structure of the malfunction analysis apparatus which concerns on one Embodiment of this invention. It is a figure which shows notionally the structure of the memory | storage means with which a malfunction analysis apparatus is equipped. It is a figure for demonstrating notionally the memory | storage mode of the video data by a memory | storage means.

  Hereinafter, an embodiment of a failure analysis apparatus according to the present invention will be described with reference to the drawings. In this embodiment, a case where a cause of a failure in a vehicle assembly line is analyzed will be described as an example.

  FIG. 1 shows an overall configuration of a failure analysis apparatus 1 according to the present embodiment. As shown in the figure, the failure analysis apparatus 1 is installed on an assembly line having a plurality of assembly steps 10 and an inspection step 20 located downstream of the assembly steps 10. Here, the assembly line is provided with a suspension-type transport conveyor 30 so as to pass through all adjacent assembly steps 10 and inspection steps 20, and in each assembly step 10, a worker 40 in charge is in charge. In the inspection process 20, the inspection person 50 has checked whether there is no problem in the assembly work performed in the upstream assembly process 10, in other words, the workpiece W that has flowed into the inspection process 20. Inspections are made for the presence or absence of defects.

  The defect analysis apparatus 1 includes an imaging unit (a fixed camera 60 and a small camera 70) for imaging a working state in a predetermined assembly step 10 among the plurality of assembly steps 10, 10. When a defect is found in the storage means 80 for storing the video data and the inspection process 20, the work in the predetermined work process of the work W in which the defect has occurred is selected from the plurality of video data stored in the storage means. Selecting means for selecting video data showing the state.

  In this embodiment, the imaging means includes two types of cameras (a fixed camera 60 and a small camera 70). The fixed camera 60 is a predetermined assembly step 10 (in FIG. 1, the rightmost side in the figure). It is installed at a position where the whole image of the assembly process 10) can be taken. The small camera 70 is mainly for imaging a detailed work state such as the hand of the worker 40. For example, as shown in FIG. 1, the small camera 70 is mounted on the head (cap) of the worker 40 and used. . These two types of cameras 60 and 70 are basically configured to always perform an imaging operation during operation of the assembly line. For example, imaging data from when the workpiece W is transferred to the work area corresponding to the predetermined assembly process 10 until when the predetermined assembly work is finished and carried out of the work area will be described later. Is temporarily stored in the temporary storage area 110 of the storage means 80. In this embodiment, the limit switch 100 provided on the conveyor 30 is used to partition and store imaging data. That is, when the workpiece W conveyed by the conveyor 30 comes into contact with (or passes through) the limit switch 100 provided in the vicinity of the downstream end of each assembly step 10, a predetermined signal is input to the storage unit 80, and the imaging unit Video data continuously captured by the (fixed camera 60 and small camera 70) is partitioned into independent video data in units of work. Of course, the configuration of the camera is arbitrary, and only one of the fixed camera 60 and the small camera 70 or a plurality of one camera may be provided as necessary.

  For example, as shown in FIGS. 1 and 2, the storage unit 80 is configured by a personal computer, and a fixed camera 60 and a small camera 70 are electrically connected to the storage unit 80. In addition, a temporary storage area 110 such as a RAM that can temporarily store the same number of video data as the number of processes from the predetermined assembly process 10 to the inspection process 20 and the video data can be stored permanently. And a main storage area 120 such as a hard disk. Therefore, N assembly processes 10 are arranged from the assembly process 10 to be imaged to the assembly process 10 located on the most downstream side, and one inspection process 20 is further downstream of these N assembly processes 10. Is arranged, the temporary storage area 110 is configured to be able to temporarily store N + 1 video data obtained by the imaging means (the fixed camera 60 and the small camera 70).

Further, in this embodiment, as shown in FIG. 2, the temporary storage area 110 is composed of (N + 1) temporary memory space M ₁ ... M _{N + 1,} the respective temporary memory space M ₁ ... M _{N + 1} One piece of video data is stored. As will be described in detail later, every time the latest video data is acquired by the imaging means, the oldest video data among the plurality of video data stored in each temporary memory space M ₁ ... M _{N + 1} is deleted. It has become so. If it is deemed necessary, the oldest video data is stored in the main storage area 120 before being erased. Here, for example, as shown in FIG. 3, the video data obtained by the imaging means is stored in order from the _first temporary memory space M ₁ , and every time the latest video data is acquired, the adjacent temporary memory space M _{When the} video data is rewritten at ₂ ... And N + 1 video data is stored in the temporary storage area 110, the oldest video data is always stored in the N + 1th temporary memory space _{MN + 1.} It has become so.

  In addition, an environmental condition may be input in the storage unit 80 in advance. Specifically, information on the work W such as vehicle type information and lifting number (serial number), information on the line equipment such as the operating state (either in operation or stopped) and the operating time of the transfer conveyor 30, or the worker Information about the worker such as age, experience years, proficiency level, physical condition of the day, work time zone (elapsed time since the start of work), etc. can be input to the storage means 80 as environmental conditions It is. These environmental condition data can be stored in the main storage area 120 in association with the video data stored in the temporary storage area 110.

  In this embodiment, the selection means receives the string-like trigger 90 provided in advance in the assembly line as line equipment, and a signal from the trigger 90, and is stored in the storage means 80 in the temporary storage area 110. Command means (command program) for instructing to store the oldest video data among the plurality of video data stored in the main storage area 120 before deleting from the temporary storage area 110. In this embodiment, the string-like trigger 90 is provided at a position where the inspector 50 can operate within the range of the normal inspection work position, and one end of the string-like trigger 90 is provided in the storage unit 80. A command signal transmission unit (not shown) that transmits a signal for commanding execution of the command program is connected. When a defect is found in the workpiece W, the inspector 50 pulls the string-like trigger 90 so that the pulling force (input signal) is transmitted to the command signal transmission unit connected to the string-like trigger 90. At the same time, the command signal transmitter that receives this input signal transmits a signal for instructing the command program provided in the storage means 80 to execute the command program.

  Hereinafter, an example of a failure analysis method when the above-described failure analysis apparatus 1 is used will be described.

First, as shown in FIG. 1, the assembly operation state of the worker 40 in a predetermined assembly process 10 is imaged with a fixed camera 60 and a small camera 70 attached to the head of the worker 40. When this assembling work is completed and the work W is carried out of the work conveyor 30 by the transport conveyor 30, the image pickup means (the fixed camera 60, the small camera 70) is received by a signal from the limit switch 100 provided on the transport conveyor 30. The obtained image data is divided and stored in the temporary storage area 110 as one independent image data. If it is the video data stored first, as shown in FIG. 3, the video data W ₁ of the work W imaged first (first) is stored in the corresponding first temporary memory space M ₁ (FIG. 3). 3 first stage S ₁ ). In this way, when two types of video data are obtained simultaneously for one work W by two types of cameras (fixed type camera 60 and small camera 70), the first temporary memory corresponding to both types of video data It may be stored in the space M ₁ , or two temporary storage areas 110 may be provided, and each video data may be stored in a separate temporary storage area 110.

Subsequently, also for the subsequent (second) workpiece W, the working state of the worker 40 after being carried into the assembling process 10 to be imaged is imaged by the fixed camera 60 and the small camera 70, and obtained by this imaging. The stored video data is stored in the temporary storage area 110. In this case, since the latest video data is always stored in the predetermined (first) temporary memory space M ₁ , the video data W ₁ already stored in the _first temporary memory space M ₁ is replaced with the adjacent second data. Is stored in the temporary memory space M ₂ . After that, the video data stored in the _first temporary memory space M ₁ is rewritten to the video data W ₂ captured _second (second stage S _{2 in} FIG. 3). In this way, with respect to the third and subsequent workpieces W, the fixed camera 60 and the small camera 70 image the work state in the assembling process 10, and the image data W ₃ obtained thereby is rewritten to the first while performing the above rewriting work. go temporarily stored in the memory space M ₁ of. By repeating the N + 1 time imaging operations and temporary storage operations described above, the image data W ₁ ... W _{N + 1} is temporarily stored by all of the temporary memory space M ₁ ... imaging means M _{N + 1} (Fig. 3 N + 1 stage S _{N + 1} ). At this time, the workpiece W imaged N times before has just passed N assembly steps 10 and reaches the inspection step 20 on the downstream side.

If the inspection person 50 checks the assembly state of the workpiece W that has reached the inspection step 20 and finds no defect, the N + 1th temporary memory space is indicated as indicated by an arrow 2 in FIG. By rewriting the _first oldest video data W ₁ stored in M _{N + 1} to the second video data W ₂ stored in the _Nth temporary memory space M _N , the oldest video data is stored. to clear the W _1. Similarly, the second video data W ₂ stored in the _Nth temporary memory space M _N is converted into the third video data W ₂ stored in the N−1th temporary memory space M _N-1 (not shown). rewritten to the video data W ₃ of. In this way, the video data W ₂ ... W _N stored immediately after the video data W ₁ ... W _N stored from the (N + 1) th temporary memory space M _{N + 1} to the second temporary memory space M ₂ respectively. Rewrite to ₊₁ . Then, as shown by the arrow 3 in FIG. 3, the latest N + 2nd video data W _{N + 2} obtained by the imaging means is stored in the _first temporary memory space M ₁ , so that all the temporary memory spaces M are stored. ₁ ... The rewriting of video data in M _{N + 1} is completed.

Further, the inspection person 50 checks the assembly state of the workpiece W that has reached the inspection process 20, and if any defect is found, the inspection person 50 pulls the string-like trigger 90 constituting the selection means. A predetermined input signal is input to a command signal transmission unit (not shown) connected to one end of the trigger 90, whereby the program is executed toward the command program provided in the storage means 80. A command signal is transmitted. As a result, the process indicated by arrow 1 in FIG. 3, in other words, the first oldest video data W ₁ stored in the (N + 1) th temporary memory space M _{N + 1} is selected and stored in the main storage area 120. A command to do so is transmitted from the command program to the storage means 80. As a result, from the plurality of video data stored in the temporary storage area 110, the video data showing the work state in the predetermined assembly process 10 of the work W that has found a defect in front of the inspector 50 is obtained. Is selected and permanently stored in the main storage area 120 such as a hard disk. Thereafter, as indicated by the arrow 2, the oldest video data W ₁ is erased by rewriting the _second video data W ₂ . Thereafter, in the same manner as described above, the video data W ₂ stored immediately after the video data W ₁ ... W _N stored from the _{N +} 1th temporary memory space M _{N + 1} to the second temporary memory space M ₂ respectively. .. Are rewritten to W _{N + 1,} and the latest N + 2th video data W _{N + 2} obtained by the imaging means is stored in the _first temporary memory space M ₁ (storage process indicated by arrow 3 in FIG. 3). Thereby, the rewriting of the video data in all the temporary memory spaces M ₁ ... M _{N + 1} is completed. Thereafter, during the line operation, the video data rewriting process in the temporary storage area 110 and the video data storing process in the main storage area 120 are continuously performed by the same method.

  In this way, when the inspector 50 finds a defect, the inspector 50 can view the image data when the defect has been selected, which is selected by the selection means, by displaying it on an appropriate video display device. . In this way, by confirming the details of the specific failure and the work status (work accuracy, work order, work tool placement, etc.) at that time, the rate is much higher than before. It becomes possible to clarify the cause of the malfunction. As in this embodiment, various environmental conditions are input to the storage unit 80 in advance, and by referring to them together, it becomes possible to investigate the cause of the malfunction earlier. Further, at this time, by storing the specific content of the defect together with the video data at that time and storing it, a defect analysis person different from the person inspecting 50 performs the defect analysis, and the defect The cause of occurrence may be clarified. In this case, it is possible to statistically grasp the cause of the failure and take more appropriate measures to prevent recurrence.

  As mentioned above, although one Embodiment of the malfunction analysis apparatus which concerns on this invention was described, this analysis apparatus is not limited to the said illustration form, It can take arbitrary forms within the scope of the present invention. Of course, the failure analysis method using the above analysis apparatus can similarly take any form within the scope of the present invention.

For example, in the above embodiment, every time the latest video data is acquired by the imaging unit, the video data is rewritten in the temporary storage area 110 and a predetermined temporary memory space (N + 1th temporary memory space M _{N + In} the above example, the video data stored in ₁ ) is stored in the main storage area 120 when a problem is found. However, the present invention is not limited to this processing method. For example, if time information (imaging time, etc.) is added to video data and stored in the temporary storage area 110, if a defect is found in the inspection step 20, it is stored (imaged) before a predetermined time. The video data may be selected from a plurality of video data stored in the temporary storage area 110 and stored in the main storage area 120. In short, the video data of the work W before the predetermined assembly man-hour is selected from a plurality of video data stored in the temporary storage area 110, stored in the main storage area 120, and deleted. The method is not particularly limited as long as a series of storage processes such as storing the latest video data in the temporary storage area 110 can be executed. Usually, in this type of assembly line (manufacturing line), each assembly process is arranged at a constant pitch (interval), and the transport speed by the transport conveyor 30 is also constant. This is because the time at which the previous work (work here before the N process) is performed is always a predetermined time before the inspection time (for example, 2 × N minutes before 1 process is 2 minutes). Therefore, in this case, the temporary storage area 110, FIG. 2 and as shown in FIG. 3, to further not necessary to separate the plurality of temporary memory space M ₁ ... M _{N + 1,} the temporary memory space M ₁ ... M _{N + 1} This also eliminates the need to rewrite the video data inside.

  In the above embodiment, the case where the image pickup means (the fixed camera 60 and the small camera 70) is installed in the assembly process 10 arranged at a position N away from the inspection process 20 is illustrated. You may make it take the imaging form. For example, the imaging means may be provided in the assembly process 10 where the frequency of occurrence of other problems is high or where problems may occur, or the imaging means may be provided in each of the plurality of assembly processes 10. Or you may make it image | photograph the area | region of the 2 process which adjoins, for example by one camera (imaging means) at a wide angle, without being seized with the concept of one imaging means per process. When a plurality of imaging means are provided in a plurality of assembly steps 10, the same video data storage processing as described above can be performed with two pieces of video data captured at the same time as one unit.

  Further, as described above, when the imaging unit is installed in a plurality of assembly steps 10, it is possible to provide the number of triggers 90 corresponding to the number of imaging units installed. Alternatively, it is possible to prepare a plurality of triggers 90 according to the content (the occurrence site of the failure, the type of the failure) where the failure is found, instead of providing the trigger 90 according to the number of assembly steps 10 to be imaged. . In this case, depending on the content, one piece of video data stored in the temporary storage area 110 may be stored in the main storage area 120, or two pieces that are assumed to be related to the occurrence of the problem. The above video data may be collectively stored in the main storage area 120.

  In the above description, the case where the failure analysis apparatus 1 is installed in the assembly line of the vehicle has been described as an example. However, the analysis technique according to the present invention is not limited to the assembly line and can be applied to a general production line. Of course.

  Of course, other specific forms can be adopted for matters other than the above as long as the technical significance of the present invention is not lost.

1 Assembly Line 10 Assembly Process 20 Inspection Process 30 Conveyor 40 Worker (Assembly Worker)
50 Inspector 60 Fixed camera 70 Small camera 80 Storage means 90 Trigger 100 Limit switch 110 Temporary storage area 120 Main storage area W Work M ₁ ... M _{N + 1} Temporary memory space W ₁ ... W _{N + 3} Video data

Claims (2)

An apparatus for analyzing a defect occurring in a workpiece in a production line having a plurality of work processes and having an inspection process provided downstream of the plurality of work processes,
An imaging means for imaging a work state in a predetermined work process among the plurality of work processes;
Storage means for storing a plurality of video data obtained by the imaging means;
When the defect is found in the inspection process, the video data showing the work state in the work process of the work in which the defect has occurred is selected from a plurality of video data stored in the storage means. Selecting means,
The storage means has a temporary storage area capable of temporarily storing the video data and a main storage area capable of permanently storing the video data,
The selection means selects video data in the work process of the work in which the defect has occurred from a plurality of the video data stored in the temporary storage area when the defect is found in the inspection process. Thus, the failure analysis apparatus is characterized in that the selected video data is stored in the main storage area.   The environmental condition is also stored together when storing the video data in the work process of the work in which the defect has been found in the inspection process and the defect has occurred in the main storage area. Failure analysis device.

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