JP2007328664A - Rework measurement system and measurement method thereof - Google Patents

Abstract

An object of the present invention is to provide a rework measurement system capable of measuring work results of defect countermeasure work (ie, rework process) occurring in a manufacturing process.
In a product manufacturing process, when a rework process for reworking a product occurs, a rework instruction issuing terminal for issuing a rework instruction, an operator input terminal for registering a rework result, It has a database server 30 for managing the rework record information, and an administrator terminal 40 for searching the database for each monitoring item in order to monitor the rework record information. According to such a configuration, it is possible to measure the work results of the rework process occurring in the manufacturing process without constructing a work result collection system (IT system) for all the processes of the manufacturing process. It is possible to visualize the loss cost generated other than the standard cost and to promote the countermeasure for the cause of the loss cost (that is, the quality improvement activity).
[Selection] Figure 3

Description

  The present invention calculates the extra cost (loss cost) caused by work defects, component defects, and design defects by measuring the work performance of the rework process among the processes related to manufacturing in the manufacturing industry. The present invention relates to an effective rework measurement system.

  In general, when the actual cost of a manufacturing process is to be measured, the work man-hours related to production can be calculated by managing the progress of work (instruction) and collecting the work results. However, there are many cases in which sufficient IT investment cannot be made depending on the scale and business performance of a company, and the above-mentioned work man-hours are grasped by a human system management method using paper or the like as a tool.

In addition, in calculating the loss cost of each manufacturing process, the actual cost and production result information of each manufacturing process, and the “manufacturing loss definition parameter” indicating the relationship between various losses and the loss cost are set. Based on this, a loss cost analysis system for a manufacturing process has been devised that can automatically calculate how much loss cost has occurred in the actual cost (see, for example, Patent Document 1).
JP 2003-162310 A (paragraphs 0013 to 0040, FIG. 1)

  However, in Patent Document 1, the loss generated in each manufacturing process, for example, the time for the rework process (defect countermeasure work), the number of operations, and the like are input from the terminal, but in actual operation, In many cases, the accuracy of the time and the number of operations input from the terminal is unknown. For this reason, an operator who analyzes the loss cost cannot calculate a sufficient management index even if it calculates the loss amount of the defect repair loss based on inaccurate input information, and cannot increase the profit of the company There is.

  The present invention is an invention for solving the above-described problems, and it is possible to perform rework that occurs in a manufacturing process without constructing a work performance collection system (IT system) for all the manufacturing processes. It is an object of the present invention to provide a rework measurement system and a measurement method thereof that can measure the work performance of a process (defect countermeasure work).

  In order to achieve the object, the rework measurement system includes an instruction issuing means for issuing a rework instruction when a rework process for reworking the product occurs in the product manufacturing process, and an input means for registering the result of the rework. And a database for managing the rework performance information, and a search means for searching the database for each monitoring item in order to monitor the rework performance information. According to such a configuration, the work of the rework process (defective product countermeasure work) occurring in the manufacturing process can be performed without building a work record collection system (IT system) for all the manufacturing processes. By measuring the actual results, it is possible to visualize the loss cost generated in addition to the standard cost, and to promote countermeasures for the cause of the loss cost (that is, quality improvement activities).

  According to the present invention, it is possible to measure the work performance of the rework process (defect countermeasure work) occurring in the manufacturing process.

The present invention is to promote optimization of production activities (quality improvement activities) by visualizing and visualizing actual loss costs exceeding standard costs while suppressing IT investment at the manufacturing site. In other words, it is to provide an IT system that can lead to activities that can realize the expansion of the profits of a company by performing partial visualization of the manufacturing process, that is, with a minimum investment in the IT system.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory diagram showing the positioning of the rework process in the manufacturing process. Focusing on the manufacturing cost, for the sake of explanation, the operation process is separated as a regular cost generation line 100 and a loss cost generation line 200. Here, the production line of an electronic circuit board is taken as an example as the production line.

  In order to produce a product, the regular cost generation line 100 first purchases necessary parts based on an order slip. When the parts are delivered, the person in charge of delivery delivery accepts the purchased parts based on the purchase slip and performs acceptance acceptance inspection (step S110). The storage case storing the parts is stored in the material warehouse and stored in a predetermined shelf or the like (step S111).

  Next, the person in charge of the distribution takes out the assembly parts instructed from the storage case in the parts warehouse in accordance with the instruction for distribution, and transports them to the production shop on the production line for distribution to the work table (step S112). . Here, the assembly part means a part necessary for assembling (assembling) the product, in other words, a part constituting the production. When the predetermined part is arranged on the parts shelf of the production shop, the person in charge of the production assembles the semi-finished product (SUB assembly) according to the production instruction (instruction) (step S113).

  When the person in charge of production completes the assembly of the assembly parts specified in the production instruction sheet (production instruction), the inspector inspects (step S114). After the inspection is completed, the semi-finished product is stored in the semi-finished product warehouse by the person in charge of distribution, and stored and stored in a predetermined shelf (step S115). The person in charge of distribution arranges a plurality of predetermined semi-finished products (kit distribution) and transports them to the total assembly shop (step S116). Next, when a predetermined semi-finished product is arranged on the parts shelf of the production shop, the person in charge of production performs total assembly of the product according to the production instruction (instruction) (step S117).

  When the person in charge of production completes the total assembly instructed in the production instruction (production instruction), the inspector performs a completion inspection (step S118). The person in charge of distribution places the product that has passed the inspection into the product warehouse (step S119). The maintenance staff regularly maintains the products in the product warehouse (step S120), and if necessary, maintains them by repairing (repairing) (step S121). The above is the normal regular cost generation line 100.

  When it is determined that there is a defect in the product / semi-product manufactured in the inspection or work check during the manufacturing process, the loss cost generation line 200 performs an operation for removing the defect. For example, if it is found that an IC component mounting defect (such as insufficient mounting solder) has occurred, solder is added to the corresponding part. If the IC pin is broken even if the IC component is not installed correctly, the corresponding IC component is soldered. Remove the solder from the corresponding IC component and re-solder the new IC component of the same type to the corresponding location. There is a need to do. In this way, the work of removing defective factors from products and semi-finished products and reworking the product to a normal state is called rework work. The place where the rework work is performed is the rework process. In FIG. 1, step S210 and step S220 correspond.

  Depending on the company, the normal work and the rework work (correction work) as described above may be processed in the same process without clearly distinguishing the rework process. In order to measure the loss cost, when the normal work category and the rework work category are managed in the same way, it is necessary to clearly divide the category.

  FIG. 2 is an explanatory diagram showing manufacturing cost by process. The horizontal axis shows the process of the production line in FIG. 1, the parts distribution process, SUB assembly process, inspection process, kit distribution process (here, the receipt and delivery of semi-finished products to the semi-finished product warehouse and the total assembly shop) A total assembly process, and a final inspection process (including a process of receiving the inspected product in a product warehouse). The vertical axis represents the accumulated cost of each process. If rework is required in the inspection process, a loss cost 211 due to the rework process and re-inspection occurs. Further, when rework is required in the completion inspection of the finished product, a loss cost 221 due to the rework process and reinspection occurs. Finally, the overall product cost is increased by the loss costs 211 and 221 minutes. For this reason, it is important to accurately measure the loss costs 211 and 221 minutes.

  FIG. 3 is a configuration diagram illustrating the rework measurement system. The rework measurement system includes a rework instruction issuing terminal 10, an operator input terminal 20, a database server 30, and an administrator terminal 40. The rework instruction issuing terminal 10, the worker input terminal 20, the database server 30, and the administrator terminal 40 are connected by a network 50 such as a LAN (Local Area Network).

  The rework instruction issuing terminal 10 is a terminal that issues an instruction when rework is necessary in the inspection process and the final inspection process, and registers the rework product in the rework instruction storage unit 31 of the database server 30. Registration of a rework product for carrying out a rework process (correction work) means registering the product / semi-finished product number, type, and lot number or serial number for identifying each product. . Further, the instruction No. of the subject to be inspected, the defective phenomenon found, the cause of the defect, the number of defective members, and the like are registered.

  The rework instruction issuing terminal 10 includes an information processing unit 11, a keyboard 13, a display device 14, an IC tag reader / writer 15, and a printer 16, and the information processing unit 11 issues an instruction for issuing an instruction for performing a rework process. The rework instruction 60 is output by the printer 16 in accordance with an instruction from the instruction issuing unit 12. Further, the IC tag reader / writer 15 writes information for specifying rework into the rework specifying IC tag 61 in accordance with an instruction from the instruction issuing unit 12. The information specifying the rework is, for example, a rework instruction number, a product / semi-product number, and the number of rework members. The rework specifying IC tag 61 uses a non-contact wireless IC tag such as RFID (Radio frequency identification) and is attached to the document of the rework instruction 60.

  The worker input terminal 20 is provided with a rework management box 21 having a slot 23 and an IC tag reader attached to the side surface of the rework management box 21 to read the rework specifying IC tag 61 and transmit the read information to the database server 30. And a writer 22.

  The rework management box 21 is a box for inputting the rework instruction 60 at the start of the rework process. When the rework process is completed, the worker takes out the rework instruction 60 from the rework management box 21, attaches the rework instruction 60 taken out to the electronic circuit board as a rework product, and delivers it to the inspection process.

  When the IC tag reader / writer 22 confirms communication with the rework specifying IC tag 61 when the rework instruction 60 is inserted into the rework management box 21, the IC tag reader / writer 22 displays the information of the rework specifying IC tag 61 attached to the rework instruction 60. Read and transmit to the database server 30 communication start information with the rework specifying IC tag 61 and information specifying the work process of the rework product. The communication start information includes the ID of the rework management box 21 and the work start time. The information for specifying the work process of the rework product includes, for example, the number (No) of the rework instruction 60, the product number of the manufactured product / semi-finished product, and the number of the rework product. Further, when the IC tag reader / writer 22 confirms the disconnection of communication with the rework specifying IC tag 61 when the rework instruction 60 is taken out from the rework management box 21, the IC tag reader / writer 22 sends the rework specifying IC tag 61 to the database server 30. Communication end information and information for specifying the work process of the rework product are transmitted. The communication end information includes the ID of the rework management box 21 and the work end time. The information for specifying the work process of the rework product includes, for example, No of the rework instruction 60, the product number of the manufactured product / semi-finished product, and the number of the rework product.

  A plurality of IC tags may be inserted into the rework management box 21. As another IC tag, for example, there is a worker specifying IC tag 62 in which information for specifying a worker is written. When the worker specifying IC tag 62 is inserted, the IC tag reader / writer 22 reads the information of the worker specifying IC tag 62, and causes the database server 30 to communicate with the communication start information with the worker specifying IC tag 62; Information identifying the worker (for example, worker number 0233 in FIG. 6B) is transmitted. The communication start information includes, for example, the ID of the rework management box 21 and the work start time. Further, when the IC tag reader / writer 22 confirms the disconnection of communication with the worker specifying IC tag 62 when the worker specifying IC tag 62 is taken out from the rework management box 21, the IC tag reader / writer 22 notifies the database server 30 of the worker. Information on the end of communication with the identification IC tag 62 and information for identifying the worker are transmitted. The communication end information includes, for example, the ID of the rework management box 21 and the work end time.

  The database server 30 is a server that stores loss cost information in the production line and analyzes the loss cost information, and stores information from the rework instruction issuing terminal 10, the worker input terminal 20, and the administrator terminal 40. The database server 30 includes a rework instruction storage unit 31, a rework loss cost storage unit 32, and a loss cost calculation processing unit 33.

  The database server 30 stores the registration information from the rework instruction issuing terminal 10 in the rework instruction storage unit 31. In addition, when the database server 30 receives information from the IC tag reader / writer 22, that is, communication start information, information for specifying a work process of a rework product, and communication end information, the database server 30 stores the information in the rework instruction storage unit 31. The received information is recorded with time information (time stamp) including date. The loss cost calculation processing unit 33 of the database server 30 calculates, for example, the work time for each rework instruction from the information in the rework instruction storage unit 31, and stores the calculation result in the rework loss cost storage unit 32.

  The administrator terminal 40 makes the database server 30 search by monitoring item for the work results of the rework process occurring in the manufacturing process, thereby visualizing the loss cost that occurs in addition to the standard cost, and determining the cause of the loss cost. It is a terminal used for analysis. The monitoring items include, for example, failure factor, failure occurrence process, line, factory, failure occurrence time zone / period, failure countermeasure completed / uncompleted.

  In the administrator terminal 40, the information processing unit 41 includes a keyboard 43, a display device 44, an IC tag reader / writer 45, and a printer 46. The information processing unit 41 includes a database search unit 42 that searches for rework processes by monitoring items. The search result by the database search unit 42 is displayed on the display device 44, and is output by writing to the IC tag by the IC tag reader / writer 45 or by the printer 46.

  FIG. 4 is an external perspective view showing an example of a work table of the rework shop. A rework management box 21 of the worker input terminal 20 is installed below the work table 71, and an IC tag reader / writer 22 is attached to the rework management box 21. The rework management box 21 is inclined forward of the drawing so that the operator can easily input the rework instruction 60 at the start of the work and take it out at the end of the work. Thereby, the operator can easily confirm the presence / absence of the rework instruction 60 in the rework management box 21. In addition, it is preferable that the insertion port 23 of the rework management box 21 is substantially vertical and upward. Thereby, the installation area of the rework management box 21 can be minimized.

  The upper part of the work table 71 is an assembly work area of the electronic circuit board 74 that is a rework product, and a plurality of parts boxes 72 are installed in front of the worker. The display device 76 is installed on the upper part of the work auxiliary stand 73 and displays information on the rework specifying IC tag 61. The worker performs a correction work on the electronic circuit board 74 in accordance with the information displayed on the display device 76. Further, when the parts need to be replaced, the parts 75 are taken out from the parts box 72 and attached to the electronic circuit board 74.

  Here, a rework management box 21 is provided as the worker input terminal 20, and work results can be collected without burdening the worker during the rework process. As another worker input terminal 20, a PC (Personal Computer) connected to the network 50 may be used. The worker who has received the rework instruction executes the selection of the rework instruction 60 and the operation for starting the work instructed on the display device 76 in order to declare the work start. Also, when the work is finished, the work finish operation is executed.

Next, the business procedure will be described with reference to FIGS.
FIG. 5 is an explanatory diagram illustrating an example of an input screen of the rework instruction issuing terminal. The inspector registers the rework process from the rework instruction input screen 80 of the display device 14 shown in FIG. 5 when the need for rework occurs in the inspection process. Specifically, the instruction number 81, the product number 82, the product name 83, and the number 84 are input, and the cause that is the factor is selected from the pull-down menu 85 (for example, 55: IC pin broken, 56: connector pin broken). Further, if a manufacturer's model 86, a lot number 87 for identifying a solid, and a serial number 88 are given, registration is possible. After the registration is completed, when the inspector presses the registration button 90, the input information is registered (stored) in the database server 30. An example of stored data stored in the database server 30 is shown in FIG. The inspector presses the cancel button 91 when canceling the registration contents during registration.

  After the registration of the rework process is completed, when the inspector presses the instruction issue button 93, the instruction issue unit 12 outputs the rework instruction 60. When the inspector presses the IC tag issue button 94, the instruction issuing unit 12 writes information for specifying the work process of the rework product on the IC tag. Note that the remark 89 describes the detailed status of the inspection result, particularly when the cause of the failure cannot be identified.

  If the cause of the failure cannot be identified, basically it cannot be corrected immediately. Therefore, it is necessary to submit a defect analysis review request to the defect review department for the defective actual product. The defect investigation department establishes the cause of the defect and a countermeasure for the cause, and the correction work is started for the first time. When the cause of failure and the cause countermeasure method are found in the defect examination department, the rework instruction 60 is issued to the corresponding countermeasure department. Until the rework instruction 60 can be issued, the corresponding lot of the corresponding product / semi-finished product or the corresponding serial product must be stored separately so as not to be mixed with the normal product / semi-finished product. At this time, when the inspector presses the temporary storage button 92, the input information is provisionally registered in the database server 30.

  FIG. 7 is a flowchart showing a procedure for storing measurement data in the rework process. When the worker (manufacturer in charge) in the work area receives the electronic circuit board 74 to which the rework instruction 60 is attached, the rework instruction 60 is received from the insertion port 23 of the rework management box 21 installed at the lower part of the work table 71. throw into. Then, a radio wave including a control signal is transmitted from an antenna (not shown) in the IC tag reader / writer 22. The antenna in the rework specifying IC tag 61 receives a radio wave from the IC tag reader / writer 22 and generates an electromotive force by the resonance action of the antenna. A circuit in the rework specifying IC tag 61 is activated by the generated power and performs necessary processing. The processing result is transmitted from the antenna on the rework specifying IC tag 61 side. The radio wave is received by the antenna of the IC tag reader / writer 22 that has received this, and the insertion of the rework instruction 60 is detected (step S301). Similarly, when the IC tag 62 for worker identification is inserted, the IC tag reader / writer 22 detects the insertion of the IC tag 62 for worker identification.

  The IC tag reader / writer 22 reads the detected information of the rework specifying IC tag 61 and transmits to the database server 30 communication start information with the rework specifying IC tag 61 and information specifying the work process of the rework product. (Step S302). Similarly, the detected information of the worker specifying IC tag 62 is read, and communication start information with the worker specifying IC tag 62 and information for specifying the worker are transmitted to the database server 30.

  The database server 30 stores the received communication start information with the rework specifying IC tag 61 and information for specifying the work process of the rework product in the rework instruction storage unit 31 as a work start record. Similarly, the database server 30 stores the received communication start information with the worker identification IC tag 62 and information for identifying the worker in the rework instruction storage unit 31 as a work start record. Information received at this time is recorded with time information (time stamp) including date (step S303).

  The IC tag reader / writer 22 performs communication with the rework specifying IC tag 61 every predetermined time, and when communication cannot be confirmed within the predetermined time, the operator inputs the rework instruction 60 and the input port 23 of the rework management box 21. It is detected that it has been taken out from (step S304). The IC tag reader / writer 22 transmits the communication end information with the rework specifying IC tag 61 to the database server 30. Similarly, when the worker detects that the worker identification IC tag 62 has been taken out from the insertion slot 23 of the rework management box 21, information on the end of communication with the worker identification IC tag 62 is stored in the database server 30. Sent.

  When the database server 30 receives the communication end information and the information for specifying the rework of the rework product from the IC tag reader / writer 22, the database server 30 adds the time information (time stamp) including the date to the received information. It records in the memory | storage part 31 (step S305). Similarly, when the database server 30 receives the communication end information and the information specifying the worker from the IC tag reader / writer 22, it adds time information (time stamp) including the date to the received information. And recorded in the rework instruction storage unit 31. Thereby, the storage procedure of the measurement data in a series of rework steps is completed.

Next, a specific example of information stored in the database server 30 will be described.
FIG. 6 is an explanatory diagram illustrating an example of a rework instruction list and a rework instruction work result list. FIG. 6A is a rework instruction list, and FIG. 6B is a rework instruction work result list. The rework instruction storage unit 31 stores information transmitted from the rework instruction issuing terminal 10 and the worker input terminal 20.

  As shown in FIG. 6 (a), the rework instruction list includes No (registration No), rework instruction No, product or semi-finished product number, number of rework, rework factor, shop number, rework start time, rework end time, and It is listed according to the parameters of the worker, and based on the transmission data from the rework instruction issuing terminal 10, the registration No, the rework instruction No, the product number of the product or semi-finished product, the number of rework, and the rework factor are stored .

  As shown in FIG. 6 (b), the rework instruction work result list adds transmission data from the worker input terminal 20 based on the rework instruction list. Specifically, the shop number is determined from the ID of the rework management box 21 of the communication start information, and the work start time of the communication start information is the rework start time (for example, 06042111412 is 14:12 on April 21, 2006). Meaning). Also, the work end time of the communication end information is the rework end time. Further, the worker number is determined from the information specifying the worker.

  FIG. 8 is an explanatory diagram showing an example of the rework instruction work loss cost list. The rework instruction work loss cost list is arithmetically processed by the loss cost arithmetic processing unit 33 in accordance with an arithmetic execution command from the administrator terminal 40 to create a list. The loss cost calculation processing unit 33 calculates a loss cost from the data of the rework work performance list in the rework instruction storage unit 31, creates a rework instruction work loss cost list, and stores it in the rework loss cost storage unit 32. For example, in the case of rework instruction No. 060421-1, the work time is 4 hours and 1 minute (241 minutes), and the work cost is multiplied by 83.3 (yen), and the loss cost is 20,075. (Yen).

  As shown in FIG. 8, in the rework instruction work loss cost list, the work time, the work unit price, and the loss cost are further added to the rework instruction work result list. From this list, it is possible to analyze, for example, the product number of a product or a semi-finished product, a failure factor (rework factor), and a failure occurrence time zone / period.

As a method of utilizing the data stored in the rework loss cost storage unit 32, the following can be cited.
(1) Aggregation of rework results and product redistribution for each reworked product / semi-product type / product number (2) Work frequency distribution by period of reworked product / semi-finished product (monthly, weekly, etc.)
(3) Occurrence frequency and temporal fluctuation trend by defect factor or defect factor code of product / semi-product to be reworked (4) Aggregation by defect category of product / semi-product to be reworked (part failure, work defect, design Cause failure)
(5) Aggregation by manufacturer and part number and temporal fluctuation trend in parts defects (6) Frequency of work defect occurrence frequency by worker in work defects (7) Cumulative work time of rework work man-hours (possibly based on amount) )
(8) Defective product next process feed rate (return work by next process feed, presence / absence of duplicate work)
(9) Yield rate calculation (number of rework process inputs / total number of production staff)

The production improvement activity or product quality improvement activity made possible by calculating the information includes the following.
(A) Increasing the level of acceptance inspection for parts causing the cause of products / semi-products with a low yield rate (B) Assessing the parts manufacturer for parts causing the cause for products / semi-products with a low yield rate ( C) Review of working methods causing low yield rate products and semi-finished products (D) Review of production technology causing low yield rate products and semi-finished products

  According to the present embodiment, the rework measurement system includes an instruction issuing means (for example, a rework instruction issuing terminal 10) that issues a rework instruction when a rework process for reworking the product occurs in a product manufacturing process. In order to monitor rework record information, input means for registering rework record (for example, worker input terminal 20), database for managing rework record information (for example, database server 30), and the like. Since there is a search means (for example, the administrator terminal 40) for searching the database for each monitoring item, countermeasure work man-hours (rework process work results) for part failures, work failures, and design failures occurring in the manufacturing process. It is possible to visualize the factors that press on profits. In addition, it is possible to visualize the factors that press down on profits by investing in IT systems only in the rework process rather than covering all manufacturing processes. Further, by visualizing the loss cost that presses down on profits, it becomes possible to support for promoting production activities (improvement activities) for reducing the loss cost.

  Product defects that occur in the manufacturing process in the manufacturing industry, for example, work defects such as component defects and component mounting defects, defects due to bringing design defects in the design stage upstream from the manufacturing process, etc. Is an event that can occur in any manufacturing industry. Depending on the unit price of the product being manufactured and the ease of rework work for defect countermeasures, it may be possible to scrap (discard) the product in which the defect occurred without reworking it, but if the recent environmental problems are omitted, it will be scrapped. It is thought that there is a tendency to decrease things.

  Examples of the manufacturing industry are fields that apply to the manufacture of finished products such as automobiles, electrical machinery and precision, and parts manufacturing. Of course, the fields of medicine, food and the like are also targeted, but the work of correcting the product by the rework work is limited for reasons such as the expiration date.

It is explanatory drawing shown about the positioning of the rework process in a manufacturing process. It is explanatory drawing which shows the cost according to process of manufacturing cost. It is a block diagram which shows a rework measuring system. It is an external appearance perspective view which shows an example of the workbench of a rework shop. It is explanatory drawing which shows an example of the input screen of a rework instruction | indication issuing terminal. It is explanatory drawing which shows an example of a rework instruction list and a rework instruction work performance list. It is a flowchart which shows the memory | storage procedure of the measurement data of a rework process. It is explanatory drawing which shows an example of a rework loss cost list.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rework instruction issuing terminal 12 Instruction issuing part 20 Worker input terminal 21 Rework management box 22 IC tag reader / writer 30 Database server 31 Rework instruction storage part 32 Rework loss cost storage part 33 Loss cost calculation processing part 40 Administrator terminal 42 Database search part 50 Network 60 Rework instruction 61 Rework identification IC tag 62 Worker identification IC tag

Claims (8)

An instruction issuing means for issuing an instruction for the rework when a rework process for reworking the product occurs in the manufacturing process of the product;
An input means for inputting the result of the rework;
A database that is stored in relation to items based on the input rework results;
Retrieval means for retrieving the database based on predetermined items of the stored rework performance information. An instruction issuing means for issuing an instruction for the rework when a rework process for reworking the product occurs in the manufacturing process of the product;
Input means for registering the results of the rework;
A database for managing the rework performance information;
Retrieval means for retrieving the database for each monitoring item for monitoring the rework performance information. The order issuing means
An IC tag writing device for writing information identifying the rework into an IC tag for rework identification;
The input means includes
A rework management box having a slot for loading the rework specifying IC tag;
The IC tag reading device attached to the rework management box, reading the rework specifying IC tag, and transmitting the read information to the database. Rework measurement system. The rework measurement according to claim 3, wherein the input means reads a plurality of IC tags put in the rework management box by the IC tag reader and transmits the read information to the database. system. The rework measurement system according to any one of claims 1 to 4, wherein the database stores time information added to information sent from the input unit. The IC tag reader notifies the database when communication with the rework specifying IC tag is possible, and notifies the database when communication with the rework specifying IC tag is interrupted. The rework measurement system according to any one of claims 1 to 4. An input means for inputting a rework result, a database for storing the rework result in association with an item, and a search for searching the database based on a predetermined item for the stored rework result information A rework measuring method for measuring the rework in a manufacturing process of a product comprising:
When a rework process for reworking the product occurs in the product manufacturing process,
The database stores the rework results input via the input means in association with predetermined items,
The rework measuring method, wherein the retrieval means retrieves the result of the rework using the predetermined item as a key. Instruction issuing means for issuing an instruction for rework including an IC tag writing device, a database for managing results information of the rework, a management box, and an IC tag reading device for reading an IC tag put in the management box In a manufacturing process of a product having an input means, a rework measurement method for measuring the rework,
When a rework process for reworking the product occurs in the product manufacturing process,
The instruction issuing means writes information identifying the rework on an IC tag,
The rework measurement method, wherein the input unit reads an IC tag placed in the management box and transmits the read information to the database.

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