JP4060431B2 - Product inspection equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a product produced on a production line comprising a main production line for producing a finished product by assembling various units, and one or more sub-production lines for assembling each unit supplied to the main production line. The present invention relates to a product inspection apparatus and a product inspection method.
[0002]
[Prior art]
Conventionally, in the main production line that assembles various units and manufactures finished products, an inspection sheet etc. is attached to each product in the middle of assembly, and when attaching each unit assembled in the sub-production line, the unit is a qualified product Usually, an operator stamps a pass mark indicating that the mark is attached to an attached inspection sheet.
[0003]
In the finished product inspection process of the main production line, the number of pass marks stamped on the inspection sheet is manually counted to determine whether the manufactured finished product is acceptable.
[0004]
In addition, the range of variation allowed for each unit assumes the worst case where other related units and the self unit vary from each other in the opposite direction from the reference value. Was set to.
[0005]
[Problems to be solved by the invention]
In such a conventional technology, each worker determines whether each unit is an acceptable product and seals it on an inspection sheet. Also, in the finished product inspection process, whether each assembled unit is an acceptable product. There is a problem that the certainty of the inspection is not sufficient because all the inspections are left to the operator's judgment, such as determining by hand counting the number of pass seals stamped on the inspection sheet .
[0006]
Further, there is a problem that production management and the like cannot be performed sufficiently because the inspection result of each unit performed in the sub-manufacturing line is not recorded in detail only by imprinting a pass mark on the inspection sheet.
[0007]
Furthermore, since the range of variation allowed for each unit is set in advance assuming the worst case, the pass range (allowable range of variation) of each unit is narrowed, and the yield rate is reduced. was there.
[0008]
The present invention has been made paying attention to such problems of the conventional technology, and has high reliability of inspection in the finished product inspection process of the main production line, and inspection for each unit in the sub-production line. It is an object to provide a product inspection apparatus and a product inspection method that can record the results as records, and further set the range of variation allowed for each unit by utilizing the inspection results of each unit. It is said.
[0010]
[Means for Solving the Problems]
  The gist of the present invention for achieving the object lies in the inventions of the following items.
[1A production comprising a main production line (20a) for assembling various units to produce a finished product, and one or more sub-production lines (20b) for assembling each unit supplied to the main production line (20a). In the product inspection device (10) for inspecting products produced in the line,
  A recording medium (21) for recording the inspection result for each unit, an inspection result writing device (61) for writing the inspection result for each unit on the recording medium (21), and the main production line (20a) And a finished product inspection device (63) for inspecting the finished product assembled in the above and judging the pass / fail,
  The recording medium (21) is attached to each product in the middle of assembly flowing through the main production line (20a),
  The inspection result writing device (61) is arranged and assembled in each process for assembling the unit assembled in the sub-manufacturing line (20b) to the product in the middle of the assembly flowing through the main manufacturing line (20a). Writing the inspection result when the unit is inspected as a single unit to the recording medium (21) attached to the product in the middle of assembling the unit,
  The finished product inspection device (63) reads an inspection result for each unit constituting the finished product from the recording medium (21), and based on a predetermined inspection value from the inspection result, the units between the units are read. A product inspection apparatus (10) characterized in that it is determined whether or not a relative variation of a predetermined inspection value is within a predetermined allowable range to determine whether the product is a finished product.
[0014]
[2]SaidTest results are accumulated and recorded in the database (54) [1]Product inspection device (10) as described.
[0018]
  The present invention operates as follows.
  A recording medium (21) for recording the inspection result for each unit is attached to each product in the middle of assembly flowing through the main production line (20a). For example, a memory card capable of reading and writing various data is used as a recording medium, and this is attached to a pallet and sent to the main production line (20a).
[0019]
Inspection that can write various data on the previous recording medium (21) in each step of assembling the unit assembled in the sub-production line (20b) to the product in the middle of the assembly flowing through the main production line (20a) The result writing device (61) is arranged, and the inspection result of the unit alone is written to the recording medium (21) attached to the product to which the unit is assembled.
[0020]
Further, a finished product inspection device (63) for inspecting the assembled finished product and determining whether it is acceptable or not is provided in a finished product inspection process of the main production line (20a), and a recording medium (21 attached to each finished product) ) Is determined as a finished product based on the inspection result for each unit recorded in (1).
[0021]
Thus, since the test results for each unit are written in the recording process (23) for each unit on the recording medium (21) attached to the product flowing through the main production line (20a), the main production line (20a) is completed. In the product inspection process, the recorded content of the recording medium (21) attached to the finished product is read, so that the inspection as a finished product can be performed reliably and easily.
[0022]
  In addition, the memory card (21)etcRecording media (21)By reading the inspection results for each unit and storing them in the database (54) or the like, it is possible to leave the manufacturing state of each product in detail as a record.
[0023]
  Further, the finished product inspection device (63) has an inspection result for each unit constituting the finished product recorded on the recording medium (21).To the specified inspection valueBetween unitsOf the predetermined inspection valueIt is determined whether or not the relative variation is within a predetermined allowable range, and pass / fail as a finished product is determined.
[0024]
  In this way, between each unitOf a given inspection valueSince the variation is inspected in the finished product inspection process, compared with the conventional case in which the range of variation allowed for each unit is set in advance assuming the worst case where the other unit and the own unit vary in the opposite direction, The yield rate can be increased. That is, the associated unitOf a given inspection valueWhen the variation is in the direction of canceling out the variation, it is possible to maintain a predetermined performance even if the variation of the inspection value with respect to the reference value is large, so that it is not necessary to treat it as a defective product.
[0025]
In addition, the tolerance determination device (91) provided in each process of the main production line (20a) for assembling the unit attaches the inspection result of each unit already assembled on the upstream side of the main production line (20a) to the product. Read from the recorded recording medium (21), and based on this, the range of variation allowed for the unit to be assembled this time is determined.
[0026]
This makes it possible to select and install a unit that is compatible with the unit already assembled on the upstream side of the line, that is, a unit that can cancel the variation of the already assembled unit. The range of allowable variation can be set widely, and the possibility that the finished product assembled through the main production line (20a) will be rejected in the finished product inspection process is reduced, and the production efficiency can be increased.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, various embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a production line 20 to which the product inspection apparatus 10 according to the first embodiment of the present invention is applied. The production line 20 includes a sub production line 20b for assembling various units constituting the finished product, and a main production line 20a for assembling the finished product by assembling the units assembled in each sub production line 20b.
[0028]
The main production line 20a flows a pallet (not shown) for placing products in the middle of assembly, and each unit is sequentially mounted while the pallet flows from the upstream to the downstream of the main production line 20a, and assembled as a finished product. It is supposed to be. Each pallet is attached with a memory card 21 in which manufacturing instruction data indicating what type of model is manufactured on the pallet. The memory card 21 is used repeatedly by circling the main production line 20a with the pallet.
[0029]
In the memory card initial writing step 22 located on the most upstream side of the main manufacturing line 20a, manufacturing instruction data representing a model to be assembled on the pallet corresponding to the memory card 21 attached to each pallet is written and stored in the memory card 21. This is a process of initializing the contents. In the middle of the main production line 20a, a plurality of unit assembly steps 23 for assembling the units assembled and inspected in the respective sub-production lines 20b to the products being assembled are arranged. In the unit assembling process 23, the outlet portions of the corresponding sub-manufacturing lines 20b are joined.
[0030]
Downstream of the main production line 20a, a finished product inspection step 24 for final inspection of the finished product is arranged. The product that has passed the inspection in the finished product inspection step 24 is packed and shipped as a finished product 25. On the other hand, a product that fails the inspection in the finished product inspection step 24 is removed from the line as a defective product 26 and is sent to repair the defective portion.
[0031]
The production line 20 includes a production management device 31 for managing a production plan such as which model to produce and how many. The production management device 31 includes a production instruction that indicates detailed instructions for production. The data 32 is connected to a database that stores inspection data 33 indicating the inspection contents of the product, reference values for determining pass / fail in the inspection, and the like.
[0032]
The production management device 31 has a function of creating manufacturing instruction data for products manufactured on each pallet based on the production instruction data 32 and the inspection data 33. The produced manufacturing instruction data is written to the memory card 21 in the memory card initial writing step 22.
[0033]
In each unit assembly process 23, a reading device (not shown) for the memory card 21 and a display device (not shown) for displaying work contents to the operator are arranged, and based on the contents read from the memory card 21. The type of unit to be assembled is displayed to the operator.
[0034]
At the outlet of each sub-manufacturing line 20b, a unit inspection device 41 for inspecting a unit assembled on the sub-manufacturing line 20b is provided. The recording medium issuing device 42 arranged adjacent to the unit inspection device 41 receives data indicating the inspection result from the unit inspection device 41, and issues a recording medium (barcode seal) 43 in which the content is represented by a barcode. It is. The recording medium (barcode / seal) 43 is an adhesive sheet with a paste on the back surface, and is attached to a corresponding inspected unit.
[0035]
The unit inspected by the unit inspection device 41 and the recording medium (barcode / seal) 43 attached thereto is temporarily stored in a stocker (not shown) disposed at the outlet of the sub-production line 20b. Appropriate units from among those stored in the product are assembled to products in the middle of assembly flowing through the main production line 20a.
[0036]
The finished product inspection step 24 includes a barcode reader 51 that reads a recording medium (barcode / seal) 43 affixed to each unit assembled in the product, and a finished product inspection that determines pass / fail as a finished product. A device 52 is arranged. A printer 53 for printing out the inspection results and a database 54 for accumulating and storing the inspection results are connected to the finished product inspection device 52. The database 54 accumulates and stores completed accumulated data 54a indicating what kind of product is manufactured when and how much, and inspection result accumulated data 54b indicating the inspection result of each manufactured product. It has become.
[0037]
Next, the operation will be described.
The units assembled in each sub-production line 20b are inspected by the unit inspection device 41 in the final process. The inspection result of the unit inspection device 41 is transmitted to the recording medium issuing device 42 through a predetermined transmission path, and the recording medium issuing device 42 records the inspection result received from the unit inspection device 41 in a barcode (barcode (Seal) 43 is issued. The recording medium (barcode / seal) 43 records the pass / fail of inspection, the inspection value, the date of manufacture, the part number, and the like.
[0038]
For example, in the case of a unit equipped with a thermistor element for detecting temperature, the characteristics of the thermistor are recorded as inspection values. More specifically, the resistance value when the temperature of the medium at 20 ° C. is measured is recorded as the inspection value. An operator working in the inspection process of the sub-manufacturing line 20b attaches the recording medium (bar code seal) 43 issued by the recording medium issuing device 42 to the corresponding inspected unit and stores it in a predetermined stocker.
[0039]
The production management device 31 creates manufacturing instruction data for products manufactured on each pallet based on the production instruction data 32 and the inspection data 33. This manufacturing instruction data is written to the memory card 21 in the memory card initial writing step 22. In each unit assembly step 23 of the main production line 20a, the contents of the memory card 21 attached to the pallet are read. Then, the work content such as which type of unit should be mounted is displayed to the worker. The operator takes out the matching unit from the stocker according to the displayed instructions and attaches it to the product being assembled.
[0040]
In this way, the unit to which the recording medium (barcode / seal) 43 is attached is assembled in each unit assembly step 23, and each unit is sequentially mounted while flowing through the main production line 20a from the upstream side to the downstream side as a finished product. Assembled. In the finished product inspection step 24 arranged at the end of the main production line 20a, the final inspection of the finished product is performed.
[0041]
FIG. 2 shows the flow of processing performed by the finished product inspection device 52 in the finished product inspection step 24. The operator of the finished product inspection step 24 reads the contents of the recording medium (barcode seal) 43 attached to each unit constituting the product using the barcode reader 51 (step S101). Then, based on the read data, the number of units that pass the single unit inspection is checked, and it is inspected whether the number is equal to a reference value (reference number) defined for the product. Note that the inspection content, the reference value used for the inspection, and the like are read from the attached memory card 21.
[0042]
By such an inspection, it is finally determined whether or not the product is acceptable (step S102). If it is acceptable (step S102; Y), a non-defective product process (step S103) such as sending the product to the next process such as packing is performed. . On the other hand, when the inspection fails, the product is removed from the line as a defective product 26 and subjected to a defective product handling process (step S104) such as being sent to repair a defective part. In any case, the finished product inspection device 52 cumulatively records the inspection results and the like in the database 54 (step S105).
[0043]
Since the recording medium (barcode / seal) 43 on which the barcode is printed is attached to the unit assembled on each sub-production line 20b in this way, each unit can be used even after the product is released from the production line 20. The inspection result can be confirmed. Further, in the finished product inspection step 24, the barcode of the recording medium (barcode / seal) 43 attached to each unit is read to recognize the number of acceptable units. Compared with the case where the number of pass marks imprinted on is manually counted, the reliability of the inspection can be improved.
[0044]
Furthermore, since the recording medium (barcode / seal) 43 is directly attached to each unit, each unit and its unit can be stored even if a stocker is provided at the end of the sub-production line 20b to store the inspected units. There will be no situation where the unit test results are separated and cannot be dealt with. In addition, since the recording medium (barcode seal) 43 is shipped with each unit attached to the unit, the data recorded on the recording medium (barcode seal) 43 can be used even after it is on the market. The date of manufacture of each unit can be known, and it is possible to easily respond to market complaints.
[0045]
Next, a second embodiment of the present invention will be described.
FIG. 3 shows a production line according to the second embodiment. The same parts as those shown in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. The configuration of the production line itself is the same as that shown in the first embodiment, but in the second embodiment, the recording medium (barcode seal) 43 is inserted in the inspection process of each sub-production line 20b. Instead of issuing and attaching to each unit, the inspection result is written in the memory card 21.
[0046]
For this reason, the inspection result writing device 61 is connected to the unit inspection device 41 of each sub-production line 20b. The inspection result writing device 61 receives the storage contents of the memory card 21 attached to the pallet flowing through the main production line 20a and the inspection result of the unit inspection device 41 through the transmission path, and the contents. Is additionally written to the memory card 21 attached to the pallet on which the product to be assembled is mounted.
[0047]
Devices arranged in the finished product inspection step 24 are an inspection result reading device 62 and a finished product inspection device 63. The inspection result reading device 62 has a function of reading the inspection result for each unit from the memory card 21 attached to the pallet on which the product to be inspected is placed. Similar to the finished product inspection device 52 in the first embodiment, the finished product inspection device 63 determines whether the finished product is acceptable based on the inspection results for each unit, and accumulates the inspection results in the database 54. It has a function to do. That is, the number of units that have passed as a single unit is checked, and pass / fail is determined by whether or not this is equal to the reference value.
[0048]
Next, the operation will be described.
The inspection result writing device 61 additionally writes the inspection result of each unit received from the unit inspection device 41 to the memory card 21 attached to the pallet on which the product to be assembled with the unit inspected this time is placed. For this reason, it is not necessary to perform the operation | work which sticks the recording medium (barcode sticker) 43 to each unit like 1st Embodiment, and can aim at reduction of an operation man-hour.
[0049]
However, since it is necessary to manage the unit so that the unit and the inspection result do not fall apart, the unit is not stored in the stocker, but the inspected unit is immediately assembled to the product on the pallet. Therefore, it is stored in the stocker at the stage before inspection. The contents to be written in the memory card 21 are inspection pass / fail, inspection value, manufacturing date, part number, and the like.
[0050]
In the finished product inspection step 24, the inspection result for each unit is read from the memory card 21 by the inspection result reading device 62, and a pass / fail judgment as a finished product is performed. Compared with the case where the inspection result is read, the inspection result can be acquired with less work man-hours. Further, since the test results of each unit are read from the memory card 21 at a time, the test results of all the units can be reliably read without omission.
[0051]
Since the memory card 21 is repeatedly used, the inspection result when it flowed through the main production line 20a last time is erased from the memory card 21, but is accumulated in the database 54. Etc. can be performed accurately. However, the inspection result does not remain in the product itself from the production line 20.
[0052]
Next, a third embodiment will be described.
The production line in the third embodiment is the same as that shown in FIG. 3, but the inspection contents performed by the finished product inspection device 63 are different. In the second embodiment, the pass / fail of the finished product is determined based on the number of units that have passed as a single unit. In the third embodiment, in addition to this, the pass / fail test is performed based on the degree of variation between the units. Is supposed to do.
[0053]
FIG. 4 shows how the acceptable range of each unit varies due to the mutual variation between the unit (A) and the unit (B). Here, both the unit (A) and the unit (B) are provided with thermistors, and the pass and fail as a unit are determined by the characteristics of these thermistors. FIG. 4 shows an allowable range with respect to the temperature variation indicated by the thermistor of each unit when the temperature of the medium of 20 ° C. is measured.
[0054]
The unit (b) and the unit (b) are used in the product in which the temperatures detected by them are related to each other, so that the relative error of the temperature detected by each unit falls within a certain range. There is a need. Here, when the unit (b) and the unit (b) measure the same temperature (20 ° C.), the difference between the detected values is allowed to 2 ° C. Therefore, if the detected value of the other unit when the temperature of the medium at 20 ° C. is unknown, assume the worst case where the temperatures detected by unit (b) and unit (b) vary in opposite directions. The allowable range of variation in each unit needs to be set in the range of 19 ° C. to 21 ° C. (71, 72). Conventionally, the acceptable range (allowable range) as a single unit has been set in this way. .
[0055]
However, since the difference between the detected values is allowed to 2 ° C., if the detected value of one unit is known, the allowable range of the other unit can be set accordingly. For example, when it is known that the detected value of the unit (a) when measuring the temperature of the medium at 20 ° C. is 21 ° C., the range (73) of 21 ° C. ± 2 ° C. is the unit (b) This is an allowable range of variation. On the contrary, when it is known that the detected value of the unit (a) when measuring the temperature of the medium at 20 ° C. is 19 ° C., the range (74) of 19 ° C. ± 2 ° C. is the unit (b) This is an allowable range of variation.
[0056]
In this way, if the tolerance of unit (b) variation is determined according to the detected value of unit (b), even a unit (b) showing a detected value of 18 ° C. or 22 ° C. It can be adopted and the defective rate as a unit can be reduced.
[0057]
Therefore, in the third embodiment, the permissible range in the unit single unit inspection in the sub-production line 20b is wider than the permissible range (19 ° C. to 21 ° C.) when the worst case is set as in the conventional case. In the finished product inspection process 24, the relative variation between the units is inspected to determine whether the product is a finished product.
[0058]
FIG. 5 shows the flow of processing performed by the finished product inspection apparatus 63 in the third embodiment. In the finished product inspection step 24, the inspection result reader 62 reads the inspection result for each unit from the memory card 21 attached to the pallet (step S201). Then, the number of units that pass the unit test is checked (step S202), and a first pass / fail determination is made based on whether the number matches the number indicated by the reference value (step S203).
[0059]
If the number of accepted units is equal to the reference value (step S203; Y), the relative relationship between the related units is based on the inspection result (in this case, the inspection value) for each unit read from the memory card 21. The general variation is inspected (step S204). When the relative variation is within the allowable range (step S205; Y), the non-defective product processing is performed (step S206), and the inspection result and the like are accumulated and recorded in the database 54 (step S208).
[0060]
When the relative variation between the related units is not within the allowable range (step S205; N), the defective product handling process (step S207) is performed and the inspection result is accumulated and recorded in the database 54 (step S205). S208).
[0061]
For example, in the example of the unit (b) and the unit (b), the acceptable range as a unit unit performed in the sub-production line 20b is a range 81 from 18.5 ° C. to 21.5 ° C. as shown in FIG. Set to. This is wider than an allowable range (19 ° C. to 21 ° C., 71 and 72 in FIG. 4) set in advance assuming the worst case of variation between the units. In the inspection performed in the finished product inspection step 24, when the inspection value of the unit (b) is 21.5 ° C, if the inspection value of the unit (b) is in the range (82) of 19.5 ° C to 23.5 ° C, The relative variation is within an allowable range, and a pass judgment is made as a finished product.
[0062]
The unit (b) with an inspection value of 21.5 ° C. is conventionally rejected by a single unit inspection. However, the unit (b) with an inspection value of 21.5 ° C. is used by considering the relative variation. However, it can be passed as a finished product, and the defect rate can be reduced.
[0063]
In the above case, the allowable range in the unit single unit inspection may be extended to 17 ° C. to 23 ° C. or the like as shown in FIG. 4, but the acceptable range in the unit single unit is 18.5 ° C. to 21.5 ° C. By setting to ° C. (81), a decrease in the pass rate in the finished product inspection process 24 is prevented.
[0064]
That is, the frequency distribution of unit variation generally follows a Gaussian distribution (83) as shown in FIG. 6 and the like, and there is rarely a large variation. If a unit with a test value that is significantly different from the center of the frequency distribution (standard value) is passed as a single unit, the counterpart unit associated with this unit can offset the variation of units that deviate greatly from the standard value. It is necessary to provide variation.
[0065]
However, the existence probability of such a unit is relatively low based on the frequency distribution 83 described above. For example, if the detected value of the unit (b) is 23 ° C., the unit (b) must have a detected value in the range 84 of 21 ° C. to 25 ° C., but most of the unit (b) Since the detected value is in the vicinity of the standard value (20 ° C.), the existence probability of the detected value of 21 ° C. or higher is low. For this reason, the probability that a defect will occur in the inspection of the relative variation between the units performed in the finished product inspection step 24 increases.
[0066]
In addition, it is advantageous to make a unit with a large variation, which rarely exists, defective at the unit unit inspection stage, rather than making it defective at the finished product stage, so that assembly work in subsequent processes is not wasted. It is.
[0067]
Next, a fourth embodiment of the present invention will be described.
In the fourth embodiment, an allowable range of relative variation between units is determined in the unit assembly step 23 of the main production line 20a, and an optimum unit is selected and assembled.
[0068]
FIG. 7 shows a production line according to the fourth embodiment. The same parts as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In each unit assembly process 23 of the main production line 20a, an allowable range determination device 91 is provided. The permissible range determination device 91 reads the inspection results for other units already attached in the unit assembly process 23 upstream from the self process from the memory card 21 attached to the pallet, and compares them relative to each other. A function is provided for obtaining an allowable range of the inspection value of the unit to be mounted in the self-process based on the variation, displaying this on a display device (not shown), and notifying the operator.
[0069]
Here, based on the inspection result in the unit inspection apparatus 41, each assembled unit is classified into three ranks A, B, and C and stored in the stocker. When storing in the stocker, a sticker indicating an identification number or the recording medium (bar code sticker) 43 shown in the first embodiment is attached to each unit.
[0070]
FIG. 8 shows the flow of processing performed in the unit assembly step 23. The inspection result writing device 61 reads from the memory card 21 attached to the pallet the inspection result of each unit already mounted in the unit assembly process 23 on the upstream side of its own process (step S301). The unit inspection device 41 transmits the read inspection result to the allowable range determination device 91 through the transmission path.
[0071]
The permissible range determination device 91 obtains the permissible range of the inspection value of the unit to be attached in its own process based on the relative variation between the inspection results (inspection values) of each unit received from the unit inspection device 41 (step) S302). Further, it is determined whether the optimal unit is A, B, or C rank (step S303), and the determination result is displayed on a display device (not shown) to notify the operator.
[0072]
The operator takes out the unit of the designated rank from the stocker, and assembles it to the product being assembled on the pallet (step S304). At this time, the recording medium (barcode / seal) 43 attached to the assembled unit is read with a barcode reader or the like, and based on this, the inspection result of the unit mounted this time is recognized, and the inspection result writing device Additional writing is performed on the memory card 21 through 61 (step S305).
[0073]
In this way, the allowable range of the units to be installed in the own process is determined based on the inspection value of each unit already installed in the unit assembly process 23 upstream of the own process, so the defect rate as a single unit can be reduced. Can be lowered. In addition, since the optimum unit corresponding to the already installed unit is selected and installed, the performance of the product can be improved.
[0074]
In the embodiment described above, the inspection result is recorded with the barcode on the recording medium (barcode / seal) 43. However, the inspection result is not limited to the barcode, and the inspection result can be mechanically read. Any recording format is acceptable. For example, magnetic recording may be used.
[0075]
【The invention's effect】
  According to the product inspection apparatus of the present invention, the inspection result of each unit alone is stored in the memory card.Etc.In the finished product inspection process, whether the product is acceptable or not is determined based on the inspection result of each unit read from the recording medium in the finished product inspection step, so that the reliability of the inspection can be improved.
[0076]
In addition, in the case of using a pasting type recording medium, the inspection result at the time of manufacture, date, etc. can be confirmed even after shipment to the market, which can be used for convenience such as maintenance. Furthermore, by leaving the inspection result in the database 54 or the like, it is possible to easily manage the defect rate and analyze the cause of the defect, and perform accurate production management.
[0077]
  Also, each unitPredeterminedBased on inspection values, between unitsOf a given inspection valueSince the allowable range of variation is determined, the allowable range of variation of each unit is widened, and the defect rate as a single unit can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a production line to which a product inspection apparatus according to a first embodiment of the present invention is applied.
FIG. 2 is a flowchart showing a flow of processing performed by the finished product inspection apparatus arranged in the finished product inspection process of the main manufacturing line in the product inspection apparatus according to the first embodiment of the present invention.
FIG. 3 is an explanatory diagram showing a production line to which a product inspection apparatus according to second and third embodiments of the present invention is applied.
FIG. 4 is an explanatory diagram showing how the acceptable range of each unit varies due to mutual variation between two units.
FIG. 5 is a flowchart showing a flow of processing performed by a finished product inspection apparatus arranged in a finished product inspection process of a main production line in a product inspection apparatus according to a third embodiment of the present invention.
FIG. 6 is an explanatory diagram showing a frequency distribution of variation in test values of units, an allowable range in a single test, and the like.
FIG. 7 shows a flow of processing performed by an inspection result writing device, an allowable range determination device and the like arranged in each unit assembly process of a main manufacturing line in a product inspection device according to a fourth embodiment of the present invention. It is a flowchart.
FIG. 8 is a flowchart showing a flow of processing performed in a unit assembly process.
[Explanation of symbols]
10. Product inspection device
20 ... Production line
20a ... Main production line
20b ... Sub production line
21 ... Memory card
22 ... Memory card initial writing process
23 ... Unit assembly process
24 ... Finished product inspection process
25 ... Finished product
26 ... Defective product
31 ... Production management device
32 ... Production instruction data
33 ... Data for inspection
41 ... Unit inspection device
42. Recording medium issuing device
43 ... Recording media (barcode seal)
51 ... Bar code reader
52, 63 ... Finished product inspection device
54 ... Database
54a ... Completion accumulation data
54b ... accumulation data
61 ... Inspection result writing device
62 ... Inspection result reading device
91 ... Allowable range determination device

Claims (2)

Products for inspecting products produced on a production line composed of a main production line for assembling various units to produce a finished product and one or more sub-production lines for assembling each unit supplied to the main production line In inspection equipment,
A recording medium for recording the inspection result for each unit, an inspection result writing device for writing the inspection result for each unit on the recording medium, and inspecting a finished product assembled in the main production line A finished product inspection device for judging,
The recording medium is attached to each product in the middle of assembly flowing through the main production line,
The inspection result writing device is disposed in each step of performing an operation of assembling a unit assembled in the sub-manufacturing line to the product in the middle of the assembly flowing through the main manufacturing line, and an inspection when the unit to be assembled is inspected alone The result is written in the recording medium attached to the product in the middle of assembling the unit,
The finished product inspection device reads an inspection result for each unit constituting the finished product from the recording medium, and relative to the predetermined inspection value between the units based on a predetermined inspection value from the inspection result. A product inspection apparatus characterized by determining whether or not the variation within a predetermined tolerance is within a predetermined allowable range and determining whether or not the product is a finished product. The product inspection apparatus according to claim 1, wherein the inspection result is accumulated and recorded in a database.

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