JPH10225848A - Production control system and production control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent increase of the number of set works by setting the upper limit number of the set works in the whole production shop, and controlling charging timing to a process facility at the head. SOLUTION: A production control system comprises a memory part 10 in which the maximum set work number and the current set work number in a production shop are stored, a set work number operation processing part 5 to renew the current set work number stored in the memory part 10 based on charging of works in a processing facility 1a at the head and work completion in a processing facility 1b at the last, and a starting acceptable/inacceptable determination processing part 4 to compare the current set work number and the maximum set work number stored in the memory part 10 to determine that starting of work is acceptable only when the current set work number is less than the maximum set work number. The set work number operation processing part 5 adds 1 to the current set work number memorized in the case where it is determined that starting of work is acceptable, and it deducts 1 from the current set work number memorized in the case where work in the processing facility at the last is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a production control system and a production control method in a production management system, and more particularly to a production control system and a production control method for managing the number of processes in progress.

[0002]

2. Description of the Related Art This type of production control system realizes stable production according to a stocking plan while managing the amount of in-process intermediate parts (in-process amount) in a production process. As an example of performing production control based on the number of processes in process, see JP-A-7-74.
No. 226 discloses a method for managing the number of processes in a semiconductor wafer production line including a plurality of processing steps. In this management method, the number of processes in the process is counted for each loading / unloading of semiconductor wafers to / from the fences under the process management, and the transition of the number of processes relative to the predetermined number of processes is predicted for a certain period in the future, and the prediction is made. If the number of work in process is predicted to exceed the appropriate range, stop the processing and transport of the semiconductor wafer to its own process with respect to the previous process,
Conversely, when the number of processes is predicted to be smaller than the appropriate range, the number of processes is averaged by making a reservation of the processing start time for the semiconductor wafer that is being processed in the previous process. As a result, it is possible to minimize the variation in the actual production in the required process corresponding to the predetermined number of productions, and to shorten the production lead time.

[0003]

The conventional production control system incorporates a mechanism for limiting the number of processes in a production shop (a production line from the equipment where the first step is performed to the equipment where the last step is performed). Did not. In the conventional production control method without a mechanism to limit the number of processes in this way, it is not possible to prevent the number of processes in the entire production shop from increasing beyond a certain amount. If it is possible, processing of the work is immediately started. Therefore, even if the equipment of the next process following the first process is stopped due to failure or maintenance, processing of the first process equipment can be started, and as a result, the amount of work in the production shop and the production lead This will lead to longer time and lower productivity.

Further, in the above-described conventional production control system, when a facility in an intermediate process in a production shop is in a state where the work can be started, a work start is instructed immediately to the facility and machining of the workpiece is started. You. Therefore, even when the next process equipment is stopped due to a failure or maintenance, the processing of the own equipment can be started, and the same problem as the above-described problem occurs between each equipment in the production shop. As a method for avoiding this problem, it is conceivable to always control the loading of the work by interposing the automatic shelves between the respective process equipments. However, in contrast, the automatic shelves which may increase the number of work in process are interposed. In other words, even if the total amount of work in the production shop is limited, it is difficult to avoid the reduction and uneven distribution of the number of work in the production shop, which eventually leads to prolonged production lead time and reduced productivity.

[0005] Japanese Unexamined Patent Publication No. 7-74226 discloses a method for producing semiconductor wafers.
It cannot be applied to general production shop control. Also,
When the control for controlling the number of works in process by controlling the loading and unloading of the automatic shelves described in this publication is applied to the control of the production shop, the automatic shelves which may increase the number of works in process due to the configuration. In the end, the production lead time is prolonged and productivity is reduced.

A first object of the present invention is to solve the above-mentioned problems, to determine the upper limit of the number of works in the entire production shop, and to control the timing of input to the leading process equipment, thereby increasing the number of works. Another object of the present invention is to enable stable production while maintaining productivity while preventing a prolonged manufacturing lead time.

A second object is to increase the number of processes and increase production by setting the upper limit of the number of processes for each process facility (or required process facility) and controlling the timing of inputting a work to each process facility. An object of the present invention is to reduce the number of work in process in a shop and prevent uneven distribution, thereby enabling stable production while maintaining productivity.

[0008]

In order to achieve the first object, a production control method according to the present invention is a production control method for a production shop in which a series of production steps are constituted by a plurality of facilities having different production steps. A storage means for storing a maximum number of works in progress which defines an upper limit of the number of works in progress in the series of production processes and a current number of works in progress indicating the number of work in progress; and Based on the input of the workpiece in the leading process equipment where the process is performed and the end of the work in the final process equipment where the final process is performed,
A work-in-process calculating means for updating the current work-in-progress stored in the storage means, and when a workpiece is input to the leading process equipment, the current work-in-progress and the maximum work-in-progress stored in the storage means are calculated. Comparing, if the current number of works does not reach the maximum number of works, it is determined that the work is possible, and if the current number of works is the maximum number of works, it is determined that the work is impossible. And

In the above case, when the determination of the possibility of starting the work by the determination means indicates that the work is permitted, the work-in-process calculating means adds 1 to the stored current work-in-progress, and When the work in the facility is completed, 1 may be subtracted from the stored current number of processes.

[0010] The production control method of the present invention is a production control method performed in a production shop in which a series of production steps are constituted by a plurality of facilities having different production steps.
The current number of workpieces indicating the number of workpieces currently in process based on the input of the workpiece in the first process equipment where the first process of the series of production processes is performed and the end of the work in the last process equipment where the last process is performed. And comparing the current number of works in process with the maximum number of works in which the upper limit of the number of works in process of the series of production processes is determined, and when the current number of works reaches the maximum number of works, It is characterized in that the input of the workpiece to the leading process equipment is restricted.

In order to achieve the above-mentioned second object, a production control method according to the present invention is a production control method for a production shop in which a series of production steps are constituted by a plurality of facilities having different production steps. A server that stores, for each process facility, the maximum number of works in progress that defines the upper limit of the number of works in process for each process and the number of work in progress indicating the number of workpieces currently in process, and is provided for each facility in the production shop. A plurality of equipment control means for limiting the input of the workpiece,
The plurality of equipment control means are connected in common with the server, and each of the equipment control means, when a workpiece is input, the current number of work in process and the maximum number of work in process for the own equipment stored in the server If the current number of work in progress has not reached the maximum number of work in progress, it is determined that work is possible.If the current number of work in progress has reached the maximum number of work in progress, it is determined that work is not possible. The present invention is characterized in that the present work quantity stored in the server is updated based on both the start and end of the work or the end of the work.

[0012] In the above case, the server stores the maximum number of works in progress that defines the upper limit of the number of works in process for each facility in the production shop and the current number of works in progress indicating the number of work in progress at each facility. The number-of-processes management table stored in association with the specified facility code, and a process procedure table in which the facility code is associated with a process procedure in the series of production processes are stored. The server communication processing means for performing mutual communication, and when the workpiece is input, the current number of work in process and the maximum number of work in relation to the own equipment code of the number of work in process management table are compared, and the current number of work in process reaches the maximum number of work in process. If it is not, it is determined that work is possible, and if the number of work in progress reaches the maximum number of work in progress, it is determined that work is not possible. From the current in-process count for code 1
And the number of in-process computing means for acquiring the equipment code of the next process equipment from the process procedure table and adding 1 to the current number of in-process equipment of the acquired equipment code.

Further, the production control method of the present invention is a production control method performed in each facility of a production shop in which a series of production processes are constituted by a plurality of facilities having different production processes. The maximum number of works in process that sets the upper limit of the number of works in process for the equipment and the current number of works in progress indicating the number of work in progress are tabulated for each equipment code that specifies each equipment to provide a work in progress management table. The code is correlated with the process procedure in the series of production processes and tabulated to form a process procedure table, and when a workpiece is input, the current number of works and the maximum number of works in process for the own equipment code in the number-of-processes management table are compared. If the current number of works in progress does not reach the maximum number of works, it is determined that work is possible, and if the current number of work in progress has reached the maximum number of works, work is determined to be impossible. When the work is performed, at the end of the work, 1 is subtracted from the current work-in-process number relating to the own equipment code in the work-in-process management table, and the equipment code of the next process equipment is obtained from the process procedure table. In addition, 1 is added to the current work-in-process number of the acquired facility code.

(Action) By grasping the point of starting the work in the first process equipment of the production shop and the point of ending the work in the last processing equipment, the number of the work in process existing in the production shop is grasped. be able to. In the present invention, the maximum number (maximum number of works in process) allowable as the amount of work in progress of the entire production shop is set in advance, and the number of workpieces currently in process (current number of works) exceeds the set maximum number of works. Since the start of work in the first process facility of the production shop is limited so that the number of processes in the production shop does not exceed the set maximum number of processes, the number of processes does not increase. Therefore, it is possible to prevent a problem that the number of processes is increased and managed in the production shop operation for many years, thereby causing a prolonged production lead time and a decrease in productivity.

Further, by capturing the end point of the work processing in the previous process and the end point in the own process, there is a work in the own process, that is, a work that has completed the previous process and has not completed the own process. The number of processes in process can be ascertained. In the present invention, the maximum number of processes in each process facility is set in advance, and the work input in the own process is controlled so as not to exceed the set maximum number of processes in each facility. There is no in-process uneven distribution between the steps.

[0016]

Next, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment> FIG. 1 is a block diagram showing a schematic configuration of a production control system according to a first embodiment of the present invention. In the figure, a leading process facility 1a and a final process facility 1b appropriately use a series of related necessary facilities from a plurality of facilities having different production processes according to, for example, the type of a workpiece (workpiece) to be input and manufacturing conditions. This is the first and last step in a job shop production system where production is performed.

The production control method of the present embodiment is based on the first process equipment 1
a, the current number of processes in the series of production processes is grasped based on the input of the work in step a and the end of the operations in the final process facility 1b, and the first process device is set so that the current number of processes does not exceed the preset maximum number of processes. The loading of the work in 1a is controlled. As a specific configuration, a head equipment communication processing unit 2a connected to the leading process equipment 1a, a final equipment communication processing unit 2b connected to the last processing equipment 1b, and whether or not the work of the leading process equipment 1a can be started is determined. Start / non-permission judgment processing unit 4 to calculate the current number of work in process, and the maximum number of work in process and the current number of work in a series of production processes of the first process equipment 1a to the last process equipment 1b (production shop). And a storage unit 10 for storing.

The file layout of the maximum number of processes and the current number of processes stored in the storage unit 10 is as shown in FIG. 2, for example. In this file layout, the item of the maximum number of work in progress shows the maximum number of work in process which is set in advance in consideration of the number of processes of the target production shop, the working time, the presence or absence of equipment maintenance, etc. The item indicates the quantity of work actually existing as a work in the production shop. In the present embodiment, as will be described in detail later, 1 is added to the item of the current work-in-process item when the work processing operation in the first process equipment is started, and 1 is subtracted when the work processing in the last process equipment is completed. The result of the arithmetic processing, such as performing, is shown.

Hereinafter, the specific operation of each part of the production control system will be described.

When a work is put into the leading equipment 1a, the leading processing equipment 1a transmits a work arrival signal 11 indicating that the work has arrived to the leading equipment communication processing part 2a, and the leading equipment communication processing part 2a Wait for start instruction 17 from. Upon receiving the work arrival signal 11 from the first process facility 1a, the first facility communication processing unit 2a transmits a work arrival report 12 to the start possibility determination processing unit 4.

Upon receiving the work arrival report 12 from the head equipment communication processing unit 2a, the start possibility determination processing unit 4 sends a request signal 13 for reading the maximum number of works in progress and the current number of works in progress to the number of works in progress calculation unit 5. Send. In-process calculation part 5
Receives the request signal 13 from the start possibility determination processing unit 4, reads the maximum number of work in progress and the current number of work in progress stored in the storage unit 10 (the process of 14 in FIG. 1), and converts this to the start possibility determination processing unit 4. Send to

Upon receiving the number-of-work-pieces notification (maximum number of work-in-process and current number of work-in-process) 15 from the number-of-work-in-process calculating section 5, the start possibility determination processing section 4 compares the received maximum number of work-in-process with the current number of work-in-process. If the current number of works does not reach the maximum number of works, it is determined that work can be started, a start possible notification 16 is sent to the head equipment communication processing unit 2a, and a start possible report is sent to the number of work in progress calculation unit 5. 18 is transmitted, and if the current number of processes is at the maximum number of processes, it is determined that work cannot be started, and the subsequent processing is suspended.

When it is determined that the work can be started and the start possible notification 16 is transmitted to the head equipment communication processing unit 2a, the head equipment communication processing unit 2a transmits a start instruction 19 to the head process equipment 1a. The processing of the workpiece is started. Further, when the start possibility report 18 is transmitted to the in-process extension processing unit 5, the in-process extension processing unit 5 adds 1 to the current in-process number stored in the storage unit 10 (FIG. 1 of 19
Processing).

On the other hand, the final process equipment 1b transmits a work end signal 21 to the final equipment communication processing 2b when the work processing of the work is completed. The final equipment communication processing 2b includes:
When the work end signal 21 is received from the final process equipment 1b,
A work completion report 22 indicating that the work of the work has been completed is transmitted to the start possibility determination processing 4.

In the start possibility determination processing 4, when the work end report 22 is received from the final equipment communication processing 2 b, a work end notification 23 is notified to the number-of-finished-works calculation processing 5. Upon receiving the work end notification 23 from the start possibility determination processing 4, the number-of-work-in-process 5 subtracts 1 from the current number of work-in-progress stored in the storage unit 10a (process 24 in FIG. 1). At this time, since there is a possibility that there is a work for which the input is suspended in the start possibility determination processing 4, the number-of-work-in-process calculation processing 5 sends the current number-of-work-in-process decrease notification 25 to the start possibility determination processing 4. I do.

The start possibility determination processing 4 includes the number-of-processes calculation processing 5
When the work-in-process reduction notification 25 is received from, if there is a work whose input has been suspended, the above-described first process equipment 1a is processed so as to perform machining processing on the work.
Performs the same processing as when a workpiece is input.

Based on the above operation, the current number of processes in a series of production processes of the first process facility 1a to the last process facility 1b (production shop) does not exceed the maximum number of processes in advance stored in the storage unit 10. Control in this way, and the amount of work in progress in the production shop is kept within the set range.

<Embodiment 2> In Embodiment 1 described above,
It is designed to control the work input of the first process equipment of the production shop, but for each of the intermediate process equipment,
Alternatively, work input may be controlled for required equipment. Here, an embodiment in which such work input can be controlled will be described. FIG. 3 shows a second embodiment of the present invention.
It is a block diagram showing a schematic structure of a production control system of an embodiment.

The production control system according to the present embodiment includes a facility control device 100a for controlling the amount of work in progress of a facility 101a for performing a machining process on a workpiece, and a facility for performing a machining process which is the next process of the machining process in the facility 101a. The equipment control device 100b that controls the amount of work in process 101b is connected to the server 200 via a LAN. Equipment 1
01a and 101b are facilities in the middle of a series of production processes.

The server 200 has a work-in-process management table 201 which defines the maximum work-in-progress and the current work-in-progress for each facility, and a process procedure table 20 in which a work processing procedure is defined.
There is a database consisting of two databases.

FIG. 4 shows an example of a file layout of the number-of-processes management table 201 existing on the server 200.
This file layout includes an item of an equipment code specifying each equipment, an item of a maximum number of works in progress for each equipment, and an item of a current number of works in progress. Here, the facility code is an identifier for recognizing each facility, a different value is assigned to each facility, and is set as a key for information retrieval. The maximum number of works in progress is an item indicating the maximum work in progress for each facility, and is set in advance in consideration of the work time of each facility, the presence or absence of facility maintenance, and the like. The current number of works in progress is an item indicating the number of current works actually existing as work in each facility.

FIG. 5 shows an example of a file layout of the process procedure table 202 existing on the server 200. In this file layout, the equipment codes related to each equipment are stored in the order of machining the work. For example, the equipment code of the target equipment is searched, and the equipment code stored in the item on the right side thereof is read out to read the next equipment code. Reference can be made to process equipment.

The equipment control devices 100a and 100b share the number-of-processes management table 201 and the process procedure table 202 existing on the server 200, and based on the contents of the number-of-processes management table 201 and the process procedure table 202, the equipment 101a , 101b, and updates the contents of the table according to the work in progress of each facility.

The specific configuration and operation of the equipment control devices 100a and 100b will be described below. Since the equipment control devices 100a and 100b have the same configuration, only the configuration and operation of the equipment control device 100a will be described here.

The equipment control unit 100a transmits a work start instruction 119 to the equipment 101a.
A facility reception processing unit 103 that receives a work arrival signal 111 and a work end signal 121 from the facility 101a;
A server communication processing unit 106 that realizes reading and writing of a database on the server 200, and a start availability determination processing unit 10 that determines whether work can be started in the facility 101a
4 and a work-in-process calculation process 5 for subtracting the current work in progress of the equipment 101a and adding the work in progress for the next process equipment 101b at the end of the work.

In the equipment control device 100a, the work arrival signal 111 from the equipment 101a is received by the equipment reception processing unit 103 when the work is put into the equipment 101a. The equipment reception processing unit 103 receives the work arrival signal 111
Is received, a work arrival report 112 is notified to the start possibility determination processing unit 104.

Upon receiving the work arrival report 12 from the equipment receiving process 103, the start possibility determination processing unit 104 sends a read request 113 to the work-in-process calculation unit 105 to perform the maximum work in progress and the current work in progress. I do. In-process calculation unit 1
05 is a read request 11 from the start possibility determination processing unit 104
Receiving 3, the server sends a read request 114 to the server communication processing unit 106 to read an information record on the equipment 101a in the work-in-process management table 201 stored on the server 200.

When the server communication processing unit 106 receives the read request 114 from the number-of-process-operations processing unit 5, the server communication processing unit 106
Equipment 1 of work-in-process management table 201 stored above
01a (information record 116),
This is notified to the number-of-process calculation processing unit 105.

The number-of-processes processing unit 105 transmits the maximum number of processes and the current number of processes in the information record 116 received from the server communication processing unit 106 to the start possibility determination processing unit 104 as number-of-processes information 117. Start availability determination processing unit 104
Is the number-of-processes information 11 received from the number-of-processes calculation processing unit 105.
7 and the current number of works in process. If the current number of works does not reach the maximum number of works, it is determined that the input can be started, and the number of works in process 105 and the equipment transmission processor 102 are determined.
Is transmitted to each of them, and when the received current number of works in process reaches the maximum number of works in process, it is determined that the start is impossible, and a work start impossible notification 120 is sent to the work number calculation processing unit 105. Notify and suspend the subsequent processing.

When the facility transmission processing unit 102 receives the start availability notification 118 from the start availability determination processing unit 104, the facility transmission processing unit 102
A start instruction 119 is transmitted to 01a, and as a result, the processing of the workpiece is started. In-process calculation processor 105
Is a start possible notification 118 from the start possibility determination processing unit 104.
When it is received, it recognizes that the process related to the input work has been completed. On the other hand, the in-process calculation processing unit 105
Is a start impossible notification 120 from the start possibility determination processing unit 104
Received, it is recognized that the processing of the input work is not completed.

On the other hand, when the processing of the work in the equipment 101a is completed, the work end signal 1 from the equipment 101a is output.
21 is received by the equipment reception processing unit 103. When receiving the work end signal 121 from the equipment 101a, the equipment reception processing unit 103 transmits a work end report 122 of the work to the start possibility determination processing unit 104.

Upon receiving the work completion report 122 from the equipment reception processing unit 103, the start possibility determination processing unit 104 transmits a work completion notification 123 to the number-of-process-calculation processing unit 105. The number-of-processes calculation processing unit 105 is a start possibility determination processing unit 1
When the work end notification 123 is received from the server 04, an acquisition request 124 for reading the process procedure table 202 is transmitted to the server communication processing unit 106.

When the server communication processing unit 106 receives the acquisition request 124 from the number-of-process-calculation processing unit 105, the server communication processing unit 106
0 is read out from the process procedure table 202 (FIG. 3).
The process procedure information 126 is transmitted to the number-of-process-calculation processing unit 105.

The number-of-processes calculation processing unit 105 acquires equipment information on equipment (here, the equipment 101b) on which the next step is to be performed, based on the process procedure information 126 received from the server communication processing unit 106. The equipment 10 of the work-in-process management table 201 for the communication processing unit 106
Information record regarding 1a and equipment 10 where the next process is performed
Acquisition request 12 to acquire information record related to 1b
7 is transmitted.

When the server communication processing unit 106 receives the acquisition request 127 from the in-process calculation unit 105, the server 101
The information record relating to a and the information record relating to the facility 101b which is the next process are read out (process 28 in FIG. 3), and the read out information records relating to the facilities 101a and 101b are provided as facility information 129 to the number-of-process-in-process calculating unit 105. Send.

Upon receiving the facility information 129 from the server communication processing unit 106, the number-of-processes processing unit 105 subtracts 1 from the current number of processes in progress of the acquired information of the facility 101a, and also updates the current information of the facility 101b in the next step. An update request 130 is added to the server communication processing unit 106 to update the information record regarding the equipment 101a and the equipment 101b in the number-of-work management table 201 on the server 200 based on the calculation result. Send.

When the server communication processing unit 106 receives the update request 130 from the number-of-work-pieces processing unit 105, the server communication processing unit 106, based on the update request 130, stores information records regarding the equipment 101 a and the equipment 101 b of the number-of-work-management table 201 on the server 200. The update is performed, and an update completion notification 132 indicating that the update has been completed is transmitted to the work-in-process calculation processing unit 105.

The number-of-work-in-process calculating unit 105 determines whether the start of work has been suspended if the processing of starting the work has been suspended, that is, the current number of work in process has reached the maximum number of work in process when the work arrives at the facility 101a. If there is a work that has been determined to be unstartable by the determination processing unit 104 and the subsequent processing is suspended, at this point, the processing for the work is performed by the above-described facility reception processing unit 102a. The process is performed in the same manner as when the arrival report is received.

As described above, in this embodiment, the facility 101
It is possible to set the upper limit of the number of processes for a and 101b and control the timing of inputting the work to each process facility, thereby preventing the increase of the number of processes and the reduction and uneven distribution of the number of processes in the production shop. Thus, stable production can be performed while maintaining productivity.

In this embodiment, the equipment 101a, 1
Although work input is controlled for 01b, work input can also be controlled for each facility in the production shop. In this case, the equipment control device provided for each equipment shares the database (work-in-progress management table and process procedure table) on the server, so that stable production can be performed while maintaining the productivity throughout the production shop. become.

In the above-described embodiment, the equipment control device provided in each equipment subtracts 1 from the current work in progress of the own equipment at the end of the work and adds 1 to the current work in progress of the equipment in the next process. As a result, the current number of processes in the work-in-process management table is updated. In the case of such an update of the current work-in-process, the leading process equipment is always deducted, and the work-in-process number cannot be managed. Therefore, the leading process equipment does not overflow, and does not lead to an increase in the amount of work in the production shop or a prolonged production lead time, which is an object of the present invention. Therefore, the number of processes in the leading process equipment is set in advance to a value corresponding to the input plan, or the process of subtracting 1 from the current number of processes in the own device at the end of the work is not performed, and the number of processes in the next process is reduced. It is desirable to perform only the process of adding 1 to the current number of processes in process.

Further, instead of the above-described process of updating the current number of works in progress, such as subtracting 1 from the current number of works in progress at the end of the work and adding 1 to the current number of work in progress of the equipment at the next step, as described above, Each of the equipment control devices provided in the equipment may perform an update process such as adding one to the current number of works in process of the own equipment when the work is input, and subtracting one to the current number of works in progress of the own equipment at the end of the work. In this case, since the equipment control device performs the update processing independently, it is possible to control the work input of any equipment in the production shop.

[0054]

According to the present invention configured as described above, the following effects can be obtained.

In the case where the number of processes in the entire production shop is limited, even if the facilities in the subsequent process are stopped due to failure or maintenance, if the number of processes in progress reaches a certain level or more, the processing of the leading process facility is performed. Since the control can be performed so as to wait for the start, there is an effect that it is possible to prevent an increase in the amount of work in the production shop and a prolonged production lead time, and to perform stable production while maintaining productivity.

When the number of processes in process is limited for each process facility, the current number of processes does not exceed a predetermined maximum number of processes even if the own process facility is ready to start work processing. Since it is possible to control the start timing of work processing work in own process equipment, if the next process equipment is stopped due to failure or maintenance,
When the number of processes in the in-process equipment reaches a certain amount, it is possible to control so that work processing and start in the in-process equipment can be waited. There is an effect that stable and stable production can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a production control method according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a file layout of a maximum number of processes and a current number of processes.

FIG. 3 is a block diagram illustrating a schematic configuration of a production control method according to a second embodiment of the present invention.

FIG. 4 is a diagram illustrating an example of a file layout of a work-in-process management table 201;

FIG. 5 is a diagram showing an example of a file layout of a process procedure table 202.

[Explanation of symbols]

 1a First process equipment 1b Last process equipment 2a First equipment communication processing unit 2b Last equipment communication processing unit 4 Startability determination processing unit 5 Work in progress calculation processing unit 10 Storage unit

Claims (6)

[Claims] In a production control method of a production shop in which a series of production processes are constituted by a plurality of facilities having different production processes, a maximum number of processes and an upper limit of the number of processes of a workpiece in the series of production processes are defined. Storage means for storing the current number of workpieces indicating the number of workpieces currently being processed; and inputting of workpieces in a first process facility in which a first process of the series of production processes is performed, and a last process device in which a final process is performed A work-in-process calculating means for updating the current work-in-progress stored in the storage means on the basis of the end of the work in; and a work stored in the storage means when a workpiece is put into the leading process equipment. Compare the number of works in process with the maximum number of works.If the current number of works does not reach the maximum number of works, determine that work is possible.If the number of work in progress has reached the maximum number of works, determine that work is impossible. A production control method, comprising: 2. The production control method according to claim 1, wherein the number-of-work-in-progress calculating means is configured to add the current number of work-in-progress to the stored number of work-in-progress when the determination of the possibility of starting the work by the determining means indicates that the work is permitted. A production control method, wherein 1 is added to the current work quantity, and 1 is subtracted from the stored current number of work-in-process when the work in the final process facility is completed. 3. In a production control method of a production shop in which a series of production processes are constituted by a plurality of facilities having different production processes, a maximum number of workpieces defining an upper limit of the number of workpieces in each process of the production shop. And a server that stores the number of work in progress indicating the number of work in progress for each process facility, and a plurality of facility control means provided for each facility in the production shop to limit the input of the work, The plurality of equipment control means are connected in common with the server, and each of the equipment control means, when a workpiece is input, the current number of work in process and the maximum number of work in process for the own equipment stored in the server If the current number of work in progress has not reached the maximum number of work in progress, it is determined that work is possible.If the current number of work in progress has reached the maximum number of work in progress, it is determined that work is not possible. Its work And updating the current number of work-in-progress stored in the server based on both the start and end of the work or the end of the work. 4. The production control method according to claim 3, wherein the server determines a maximum number of workpieces which defines an upper limit of the number of workpieces related to each facility of the production shop and the number of workpieces currently being processed. The number of in-process work shown is stored in association with a facility code for specifying each facility, and a process procedure table in which the facility code is associated with a process procedure in the series of production processes is stored. The equipment control means, the server communication processing means for performing mutual communication with the server, When the workpiece is input, the current work number and the maximum work number relating to the own equipment code of the work in progress management table, If the current number of works in progress does not reach the maximum number of works in progress, it is determined that work is possible. A work in which 1 is subtracted from the current work in process related to the own work code in the work in progress management table, the equipment code of the next process equipment is obtained from the process procedure table, and 1 is added to the current work in progress of the obtained equipment code. A production control method, comprising: a numerical operation means. 5. A production control method which is performed in a production shop in which a series of production processes are configured by a plurality of facilities having different production processes, wherein a work to be performed in a first process facility in which a first process of the series of production processes is performed. Based on the input of the product and the end of the work in the final process equipment in which the final process is performed, the current number of processes in progress indicating the number of the currently-processed workpieces is obtained, and the current number of processes and the workpieces in the series of production processes are obtained. Comparing with the maximum number of work in process that set the upper limit of the number of work in progress, when the current number of work in progress reaches the maximum number of work in process, limiting the input of the workpiece to the first process equipment. Production control method. 6. A production control method performed in each facility of a production shop in which a series of production processes are constituted by a plurality of facilities having different production processes, wherein the number of work in progress of a workpiece relating to each process facility of the production shop is provided. The maximum number of work in process and the current number of work in progress indicating the number of workpieces currently in process are tabulated for each equipment code that specifies each equipment and used as a work in progress management table, and the equipment code is used in the series of production processes. When the work is input, the current work quantity and the maximum work quantity for the own equipment code in the work quantity management table are compared, and the current work quantity is set to the maximum work quantity. If the number has not been reached, it is determined that work is possible.If the number of work in progress has reached the maximum number of work in progress, it is determined that work is not possible. At the end of the work, 1 is subtracted from the current work-in-process number relating to the own equipment code in the work-in-process management table, and the equipment code of the next process equipment is obtained from the process procedure table. A production control method, wherein 1 is added to the value.