JP2014123300A - Production flow system and production flow method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a matching check by refeeding a refed work to facilities without using a flow management system.SOLUTION: In second facilities 30, a detection part 32 detects trouble of a work 70. The work 70 is determined as a refed work 71, and a detection information acquisition part 35 acquires work information on the refed work 71. The work information on the refed work 71 is transmitted from a second communication part 34 of the second facilities 30 to first facilities 20. The first facilities 20 receive the work information on the refed work 71 from the second facilities 30, and store the work information in a buffer part 25. Work information on the refed work 71 of the time when the refed work 71 is refed to the first facilities 20 is acquired by a refeed information acquisition part 22. A matching part 26 of the first facilities 20 performs matching between the work information stored in the buffer part 25 and the work information acquired by the refeed information acquisition part 22.

Description

  The present invention relates to a production flow system and a production flow method.

  Conventionally, for example, Patent Document 1 proposes a production management system including a plurality of terminals and a management server capable of communicating with the plurality of terminals via a predetermined communication line. Each terminal is provided in a facility for performing a predetermined process for manufacturing an article.

  In a system that manages the manufacture of an article like such a production management system, a flow management system constructed by a program that manages the manufacturing state of the article by a management server is usually employed. Specifically, the flow management system is a program that receives, for each work, whether or not the product has been correctly assembled by receiving work information on the work that is in the process of assembling the article from each terminal.

  For example, when a re-input work occurs in any equipment on the production line, the terminal of the equipment outputs work information of the re-input work to the management server. Thereby, the management server grasps the existence of the re-input work. In addition, the re-introduced work is re-introduced into the corresponding equipment if there is no problem in re-assembly. Along with this, the terminal of the equipment where the re-input work is re-input transmits the work information of the re-input work to the management server.

  Then, the management server receives the work information of the re-input work re-input to the corresponding equipment from the terminal, and the work information of the re-input work acquired when the re-input work occurs and the work information of the re-input work acquired at the time of re-input A matching check is performed to check whether or not and match. Thereby, it is determined whether or not the re-input work re-input to the equipment should be re-input, and only the correct re-input work can be put on the production line again. In this way, foreign matter is prevented from entering the equipment.

JP 2007-26322 A

  However, since the flow management system is configured by a complicated program so that the management server can manage a plurality of terminals, a specialized person of the program is high and an appointed person who can deal with the program is required. Therefore, when a problem such as a system failure occurs in the management server, there is a problem that no one can immediately restore the flow management system. For this reason, the recovery risk of the flow management system is very high, and there is a possibility that the matching check cannot be performed even if the re-input work is re-input.

  In view of the above points, it is a first object of the present invention to provide a production flow system capable of performing a matching check by re-inputting a re-input work into equipment without using a flow management system. A second object is to provide a production flow method applied to the system.

  In order to achieve the above object, according to the first aspect of the present invention, the first equipment (20) performing the first step on the work (70) and the work (70) that has passed through the first equipment (20). The second facility (30) performing the second step is a production flow system configured to be communicable via the inter-facility information communication means (50), and is characterized by the following points.

  That is, the second facility (30) has a detection means (32) for detecting a failure of the work (70), and a work (70) in which the failure is detected by the detection means (32) as a re-input work (71). Detection information acquisition means (35) for acquiring workpiece information of the re-input workpiece (71). Moreover, the 2nd communication means (34) which transmits the workpiece | work information of the re-input workpiece | work (71) acquired by the detection information acquisition means (35) to a 1st installation (20) via an inter-facility information communication means (50). )have.

  On the other hand, the first equipment (20) receives the work information of the re-input work (71) from the second communication means (34) of the second equipment (30) via the inter-facility information communication means (50). Communication means (24) and buffer means (25) for storing work information of the re-input work (71) received by the first communication means (24). Further, the re-input information acquisition for acquiring the work information of the re-input work (71) when the re-input work (71) taken out from the second equipment (30) is re-input to the first equipment (20). Means (22). Furthermore, it has a matching means (26) for collating the work information stored in the buffer means (25) and the work information acquired by the re-input information acquiring means (22). .

  According to this, the first equipment (20) where the re-input work (71) is re-input shares the work information of the re-input work (71) generated in the second equipment (30) with the second equipment (30). can do. For this reason, the 1st installation (20) becomes a main body and the matching of the workpiece | work information of a re-input workpiece | work (71) can be performed. Therefore, the conventional management server and the flow management system can be abolished, and the matching check of the re-input work (71) can be performed without using the flow management system having a high recovery risk.

  In the invention according to claim 3, the detection step of detecting the defect of the work (70) in the second facility (30) by the detection means (32) is performed. Next, the work (70) in which the defect is detected by the detection means (32) is set as the re-input work (71), and the detection information acquisition means (35) acquires the work information of the re-input work (71). Perform the acquisition step.

  Subsequently, the work information of the re-input work (71) obtained by the detection information obtaining means (35) is transferred from the second communication means (34) of the second equipment (30) via the inter-facility information communication means (50). The transmission step of transmitting to the first facility (20) is performed. The work information of the re-input work (71) is received by the first communication means (24) of the first equipment (20) from the second communication means (34) of the second equipment (30), and the re-input work is received. A storage step of storing the work information of (71) in the buffer means (25) of the first facility (20) is performed.

  Thereafter, the work information of the re-input work (71) when the re-input work (71) taken out from the second equipment (30) is re-input to the first equipment (20) is re-input information acquisition means. The re-input information acquisition step acquired by (22) is performed. Further, a matching step in which the work information stored in the buffer means (25) and the work information obtained by the re-input information obtaining means (22) are collated by the matching means (26) of the first facility (20). It is characterized by performing. Thereby, the same effect as that of claim 1 can be obtained.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a block diagram of a production flow system concerning one embodiment of the present invention. It is the block diagram which showed the flow of the re-input work and the work information of the said re-input work. It is the schematic diagram which showed a mode that work information was rewritten in a buffer part.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the production flow system is a system in which a front facility 10, a first facility 20, a second facility 30, and a rear facility 40 are configured to be communicable via an inter-facility information communication unit 50. .

  The front facility 10, the first facility 20, the second facility 30, and the rear facility 40 are facilities for manufacturing articles. These facilities are incorporated in a production line 60 such as a conveyor, and are configured to perform a predetermined process on the workpiece 70 placed on the pallet 61 of the production line 60. A plurality of pallets 61 are arranged on the production line 60 at regular intervals, for example, and move on the production line 60 at a predetermined speed.

  The workpiece 70 is in a state in which the article is being manufactured. The work 70 has the work information of the work 70 as, for example, a QR code (registered trademark). The QR code (registered trademark) is printed on the work 70 and read by a code reader or the like installed in each facility. “Work information” includes, for example, the product number, serial number, etc. , Information on process completion, OK signal and the like. The product number is a character string determined for the type of product, and the product number is the same for the same product. Serial No. Is a character string attached to each item, and is different for each item.

  The inter-facility information communication unit 50 is a communication unit that connects the front facility 10, the first facility 20, the second facility 30, and the rear facility 40 to each other by, for example, a LAN. For example, the Ethernet (registered trademark) standard is adopted in the LAN.

  The front facility 10 is a facility that performs a predetermined process on the workpiece 70 before the first facility 20. The rear facility 40 is a facility that performs a predetermined process on the workpiece 70 that has passed through the second facility 30. The facilities arranged between the front facility 10 and the rear facility 40 are the first facility 20 and the second facility 30.

  The first facility 20 is a facility that performs the first step on the workpiece 70 that has passed through the previous facility 10. The first facility 20 includes a first assembly unit 21, a re-input information acquisition unit 22, and a first control unit 23.

  The first assembly unit 21 is an assembly mechanism that operates according to the sequence set by the first control unit 23. The first assembly unit 21 is configured to perform a first step of assembling, for example, a cover to the work 70.

  The re-input information acquisition unit 22 is information for acquiring the work information of the work 70 when the work 70 in which a defect is found in the second equipment 30 after the first equipment 20 is re-input to the first equipment 20. It is an acquisition means. That is, in the second facility 30 that assembles the workpiece 70 after the first facility 20, a defect such as a defect may occur in the workpiece 70. The work 70 in which the defect has occurred is referred to as a re-input work 71. The re-introduced work 71 is once removed from the production line 60. However, if there is no problem in re-assembly, it is put on the production line 60 again. In the present embodiment, since the re-input work 71 is re-input to the first equipment 20, the re-input information acquisition unit 22 acquires the work information of the re-input work 71 re-input to the first equipment 20. The re-input information acquisition unit 22 is, for example, a code reader.

  The 1st control part 23 is a control means which controls each so that the 1st assembly part 21 and the re-entry information acquisition part 22 operate | move in a predetermined sequence. The 1st control part 23 is comprised by CPU, memory, a hard disk, etc., for example. Moreover, the 1st control part 23 gets the work information of each workpiece | work 70 introduced into the said 1st installation 20 on the production line 60 with a code reader, and each workpiece | work 70 which entered the 1st installation 20 is each obtained. to manage. In this case, the workpiece information of the workpiece 70 may be acquired by the above-described re-input information acquisition unit 22.

  Further, the first control unit 23 includes a first communication unit 24, a buffer unit 25, and a matching unit 26. Among these, the 1st communication part 24 is a communication means for performing transmission / reception of data, such as workpiece information, between other facilities, such as the 2nd installation 30, via the inter-facility information communication part 50.

  The buffer unit 25 is a storage unit that stocks the work information of the re-input work 71 acquired by the re-input information acquisition unit 22. When a plurality of re-input workpieces 71 are generated, the buffer unit 25 stores the work information of the re-input workpieces 71 received from the second equipment 30 by the first communication unit 24 for each re-input workpiece 71 by a certain number. In addition, when the first communication unit 24 receives the work information of the re-input work 71 after the first communication unit 24 exceeds a certain number, the buffer unit 25 deletes the oldest work information from the certain number of work information and obtains the newest work information. Store.

  The “predetermined number” is determined according to conditions such as, for example, that the manufacturing date of the article is within the same day, and that the number of re-input workpieces 71 is within a predetermined number. In the present embodiment, the fixed number is set to 20, for example. Thus, even if the re-input work 71 occurs in the second equipment 30, the number of the re-input work 71 handled by the first equipment 20 is restricted. Thereby, there is an advantage that the management of the number of re-input work 71 becomes easy.

  The matching unit 26 is a determination unit that compares the work information of the re-input work 71 stored in the buffer unit 25 with the work information of the re-input work 71 acquired by the re-input information acquisition unit 22.

  The second facility 30 is a facility that performs the second step on the workpiece 70 that has passed through the first facility 20. The second facility 30 includes a second assembly unit 31, a detection unit 32, and a second control unit 33.

  The second assembly unit 31 is an assembly mechanism that operates according to the sequence set by the second control unit 33. The second assembly unit 31 is configured to perform a second step of assembling, for example, a bolt to the work 70.

  The detection unit 32 is a detection unit that detects a defect of the workpiece 70 by, for example, image recognition by photographing with a camera. When detecting a defect of each workpiece 70, the detection unit 32 reads the workpiece information of the workpiece 70 with a code reader, for example, and outputs it to the second control unit 33.

  The 2nd control part 33 is a control means which controls each so that the 2nd assembly part 31 and the detection part 32 operate | move in a predetermined sequence. The second control unit 33 is configured by, for example, a CPU, a memory, a hard disk, and the like. Moreover, the 2nd control part 33 gets on the production line 60, the workpiece | work information of each workpiece | work 70 introduced into the said 2nd installation 30 with a code reader, and each workpiece | work 70 which entered the 2nd installation 30 is each obtained. to manage.

  Further, the second control unit 33 includes a second communication unit 34 and a detection information acquisition unit 35. The second communication unit 34 is a communication unit for transmitting and receiving data such as work information to and from other facilities such as the first facility 20 via the inter-facility information communication unit 50. When the detection information acquisition unit 35 acquires the work information of the re-input work 71, the second communication unit 34 obtains the work information of the re-input work 71 through the inter-facility information communication unit 50. It transmits to the communication part 24.

  The detection information acquisition unit 35 is an information acquisition unit that recognizes the work 70 in which the defect is detected by the detection unit 32 as the re-input work 71 and acquires the work information of the re-input work 71.

  The above is the overall configuration of the production flow system according to the present embodiment. In addition, as the 1st control part 23 and the 2nd control part 33, PLC (programmable logic controller) is employ | adopted, for example.

  Next, a production flow method for manufacturing an article in the production flow system of FIG. 1 will be described. First, manufacture of an article is started from the front facility 10 (pre-equipment step). Specifically, by performing a predetermined process in the front facility 10, the work 70 assembled to some extent is placed on the pallet 61 of the production line 60 and moved to the first facility 20. Each work 70 is given a QR code (registered trademark) at any stage of the front facility 10 so that the individual work 70 can be identified.

  Then, a 1st process is performed with the 1st equipment 20 (1st process step). That is, when the work 70 moves to the first equipment 20, the code reader of the first equipment 20 reads the QR code (registered trademark) attached to the work 70, and the work information of the work 70 is managed by the first control unit 23. To do. As described above, since the production line 60 and the pallet 61 are moved at any time, the first control unit 23 also moves the position information of the work information of the work 70 moving in the first facility 20 at any time. And the 1st assembly part 21 of the 1st installation 20 performs the assembly | attachment which concerns on a 1st process with respect to the workpiece | work 70. FIG.

  Next, the second process is performed by the second equipment 30 (second process step). That is, the work 70 that has passed through the first equipment 20 moves onto the production line 60 and moves to the second equipment 30. Therefore, the code reader of the second equipment 30 reads the QR code (registered trademark) attached to the work 70 and manages the work information of the work 70 by the second control unit 33. Similar to the first control unit 23, the second control unit 33 moves the position information of the workpiece information of the workpiece 70 that moves in the second equipment 30 as needed. Further, the second assembly unit 31 of the second equipment 30 performs the second process on the workpiece 70.

  And it is detected by the detection part 32 of the 2nd installation 30 whether the workpiece | work 70 has a malfunction (detection step). Defect detection is performed according to the article to be manufactured, such as image recognition, electrical test, mechanical test, and the like. When the detection unit 32 does not find a defect in the work 70, the work 70 moves to the rear equipment 40 together with the production line 60.

  Thereafter, a predetermined process is performed in the rear facility 40 (rear facility step). Also in the rear equipment 40, the code reader reads the QR code (registered trademark) attached to the work 70 and manages the work information of the work 70. Thereafter, the entire article is completed by assembling the work 70 with the equipment 40.

  Next, a case where the re-input work 71 occurs in the second equipment 30 will be described. In this case, it is operation | movement of each installation between the above-mentioned 2nd process step and a post-equipment step.

  First, as described above, the pre-equipment step, the first process step, and the second process step are performed. In the detection step, the detection unit 32 detects a failure of the work 70 in the second facility 30. In this way, it is assumed that the work 70 in which a failure is detected by the detection unit 32 is a re-input work 71 and is different from a normal main work.

  Moreover, the work information of the re-input work 71 is acquired by the detection information acquisition unit 35 (detection information acquisition step). The detection information acquisition unit 35 stores and holds the work information of the re-input work 71 input from the detection unit 32. After the detection information acquisition unit 35 acquires the work information of the re-input work 71, the re-input work 71 is discharged from the second facility 30 by, for example, an operator as shown in FIG.

  Subsequently, the work information of the re-input work 71 acquired by the detection information acquisition unit 35 is transmitted from the second communication unit 34 of the second facility 30 to the first facility 20 via the inter-facility information communication unit 50 (transmission). Step). Accordingly, the first equipment 20 receives the work information of the re-input work 71 by the first communication unit 24 and stores the work information of the re-input work 71 in the buffer unit 25 of the first equipment 20 (storage). Step).

  Here, the number of work information of the re-input work 71 received by the first equipment 20 from the second equipment 30 may exceed a certain number that can be stored in the buffer unit 25. In such a case, as shown in FIG. 3, the buffer unit 25 erases the oldest work information from the buffer unit 25 and stores the newest work information in the buffer unit 25.

  On the other hand, of the re-introduced work 71 taken out from the second facility 30, the worker determines that there is no problem in the reassembly by visual observation or the like, and the worker carries it to the first facility 20. Then, as shown in FIG. 2, the worker places the recharged workpiece 71 on the pallet 61 located between the front facility 10 and the first facility 20 in the production line 60, and the recharged workpiece 71 is placed in the first facility. 20 again.

  As described above, when the re-input work 71 is re-input to the first equipment 20, the first equipment 20 acquires the work information of the re-input work 71 by the re-input information acquisition unit 22 (re-input information acquisition step). . This is performed by reading the QR code (registered trademark) of the re-input work 71 that has entered the first facility 20 with a code reader.

  In addition, the workpiece | work 70 which enters into the 1st installation 20 is not necessarily the workpiece | work 70 currently flowing into the production line 60, and may be the re-input workpiece | work 71 as mentioned above. The first equipment 20 only acquires “work information” of the work 70 or the re-input work 71, and the work information does not include the re-input work 71. That is, it is unknown when the re-input work 71 is re-input to the first equipment 20. Thus, for example, a part of the plurality of pallets 61 is set exclusively for recharging. As a result, the work information acquired from the re-input dedicated pallet 61 by the re-input information acquisition unit 22 is that of the re-input work 71.

  Then, the matching of the work information stored in the buffer unit 25 and the work information acquired by the re-input information acquisition unit 22 is performed by the matching unit 26 of the first equipment 20 (matching step). Specifically, the matching unit 26 selects the serial number of 20 pieces of work information stored in the buffer unit 25. Out of the work information acquired by the re-input information acquisition unit 22 from the serial number. And search for each serial number. It is determined whether or not they match. The matching unit 26 stores the serial number of each piece of work information. If it is determined that the two are matched, the first equipment 20 reassembles the re-input work 71 that has been re-input without stopping the operation state.

  On the other hand, the matching unit 26 has a serial NO. When it is determined that the two do not match, the first equipment 20 issues an alarm to notify the operator and stops the operation state. Accordingly, the worker removes the re-input workpiece 71 from the first facility 20 and restarts the first facility 20 when the worker determines that no foreign matter is mixed into the first facility 20. As a result, the production flow system returns to the normal operating state.

  As described above, in this embodiment, the production flow system is configured so that the work information of the re-input work 71 detected by the second equipment 30 is shared with the first equipment 20 via the inter-facility information communication unit 50. It is a feature. That is, the first equipment 20 and the second equipment 30 are configured so that the first equipment 20 to which the re-input work 71 is re-input can share the work information of the re-input work 71 generated in the second equipment 30 with the second equipment 30. Is configured.

  Thereby, even if it does not use the conventional management server and flow management system which manage the 1st installation 20 and the 2nd installation 30, the 1st installation 20 becomes a main body and performs matching of the work information of the re-input work 71 It is possible to prevent foreign matter from entering the first equipment 20. Therefore, the management server and the flow management system can be abolished in the production flow system. Along with this, a management server for managing each facility becomes unnecessary, which leads to cost reduction.

  In the present embodiment, the first facility 20 and the second facility 30 are incorporated in the production line 60, but the first facility 20 and the second facility 30 are operated by a program dedicated to each facility. For this reason, even if each equipment system goes down, the full-time person of each equipment can respond easily. Therefore, although the conventional flow management system has a high recovery risk such as the need for a full-time management server, the recovery risk of each facility in the production flow system can be reduced.

  Furthermore, the buffer unit 25 of the first facility 20 stores a fixed number of pieces of work information, and is regulated so as not to handle the pieces of work information exceeding a fixed number according to a predetermined condition. Thereby, the work information of the latest re-input work 71 can be shared by the first equipment 20 and the second equipment 30, and the re-input work 71 can be easily handled. That is, since the re-input work 71 itself is less likely to occur, it is easier to eliminate the possibility of contamination by restricting the number of pieces of work information to be stocked. In addition, it is possible to prevent what has been the re-input work 71 yesterday or before, from being re-input to the first equipment 20 as a foreign object.

  Regarding the correspondence between the description of the present embodiment and the description of the scope of claims, the inter-facility information communication unit 50 corresponds to “inter-facility information communication means” of the scope of claims. For the first facility 20, the first communication unit 24 corresponds to "first communication means" in the claims. The buffer unit 25 corresponds to the “buffer unit” in the claims, and the re-injection information acquisition unit 22 corresponds to the “re-injection information acquisition unit” in the claims. Further, the matching unit 26 corresponds to “matching means” in the claims. For the second facility 30, the second communication unit 34 corresponds to "second communication means" in the claims. The detection unit 32 corresponds to “detection means” in the claims, and the detection information acquisition unit 35 corresponds to “detection information acquisition means” in the claims.

(Other embodiments)
The configuration of the production flow system shown in the above embodiment is an example, and the present invention is not limited to the configuration shown above, and other configurations that can realize the present invention can be used. For example, another facility may exist between the first facility 20 and the second facility 30. Further, the front facility 10 and the rear facility 40 may be composed of a plurality of facilities. Furthermore, the communication method of the inter-facility information communication unit 50 is not limited to Ethernet (registered trademark), and other methods may be used.

  The configurations of the first facility 20 and the second facility 30 are not limited to the one embodiment. For example, the buffer unit 25 and the matching unit 26 of the first control unit 23 may be configured differently from the first control unit 23, and the detection information acquisition unit 35 of the second control unit 33 is the second control unit. The configuration may be different from 33. The same applies to the first communication unit 24 and the second communication unit 34.

  When the re-entry work 71 in which the failure is detected by the detection unit 32 of the second facility 30 is taken out from the second facility 30 and re-entered into the first facility 20, the operator performs the re-injection from the second facility 30. The work 71 may be discharged and re-input to the first equipment 20 may be automated by the equipment mechanism.

  In the above-described embodiment, the workpiece information of the workpiece 70 and the re-input workpiece 71 is represented by a QR code (registered trademark), but this is an example. Therefore, the work information may be represented by a one-dimensional bar code or symbol.

20 First equipment 22 Re-input information acquisition unit (re-input information acquisition means)
24 1st communication part (1st communication means)
25 Buffer section (buffer means)
26 Matching part (matching means)
30 Second equipment 32 Detection unit (detection means)
34 2nd communication part (2nd communication means)
35 Detection information acquisition unit (detection information acquisition means)
50 Inter-facility information communication unit (inter-facility information communication means)
70 work 71 re-input work

Claims (4)

A first facility (20) that performs a first step on the workpiece (70), a second facility (30) that performs a second step on the workpiece (70) that has passed through the first facility (20), and Is a production flow system configured to be communicable via the inter-facility information communication means (50),
The second facility (30) is:
Detecting means (32) for detecting a defect of the workpiece (70);
A detection information acquisition means (35) for acquiring the work information of the re-input work (71), wherein the work (70) in which a defect is detected by the detection means (32) is set as a re-input work (71);
Second communication means for transmitting the work information of the re-input work (71) acquired by the detection information acquisition means (35) to the first equipment (20) via the inter-facility information communication means (50). (34)
The first facility (20) includes:
First communication means (24) for receiving work information of the re-input work (71) from the second communication means (34) of the second equipment (30) via the inter-facility information communication means (50);
Buffer means (25) for storing work information of the re-input work (71) received by the first communication means (24);
Re-input information acquisition for acquiring work information of the re-input work (71) when the re-input work (71) taken out from the second equipment (30) is re-input to the first equipment (20) Means (22);
And a matching means (26) for collating the work information stored in the buffer means (25) and the work information acquired by the re-input information acquiring means (22). And production flow system.   The buffer means (25) stores a predetermined number of pieces of work information of the re-input work (71) for each re-input work (71) when a plurality of the re-input work (71) occurs. When one communication means (24) receives the work information of the re-input work (71) exceeding the predetermined number, the oldest work information is deleted from the predetermined number of work information and the newest work information is stored. The production flow system according to claim 1. A first facility (20) that performs a first step on the workpiece (70), a second facility (30) that performs a second step on the workpiece (70) that has passed through the first facility (20), and Is a production flow method in a production flow system configured to be communicable via the inter-facility information communication means (50),
A detection step of detecting a defect of the work (70) in the second facility (30) by a detection means (32);
Detection information acquisition in which the work (70) in which a failure is detected by the detection means (32) is set as a re-input work (71), and the work information of the re-input work (71) is acquired by a detection information acquisition means (35). Steps,
The work information of the re-input work (71) acquired by the detection information acquisition means (35) is transferred from the second communication means (34) of the second equipment (30) to the inter-facility information communication means (50). Transmitting to the first facility (20) via,
The work information of the re-input work (71) is received by the first communication means (24) of the first equipment (20) from the second communication means (34) of the second equipment (30), and the re-input is performed. A storage step of storing workpiece information of the workpiece (71) in the buffer means (25) of the first facility (20);
The work information of the re-input work (71) when the re-input work (71) taken out from the second equipment (30) is re-input to the first equipment (20) is re-input information acquisition means ( 22) the re-input information acquisition step acquired by
Matching in which the work information stored in the buffer means (25) and the work information obtained by the re-input information obtaining means (22) are collated by the matching means (26) of the first facility (20). Steps,
A production flow method characterized by comprising:   In the storing step, the buffer means (25) is used for storing a certain number of work information of the re-input work (71), and the first communication means (24) exceeds the certain number and the re-insertion work (71) is stored again. When the workpiece information of the input workpiece (71) is received, the oldest workpiece information of the fixed number of workpiece information is deleted from the buffer means (25) and the newest workpiece information is stored in the buffer means (25). The production flow method according to claim 3.

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