JPH0611464B2 - Production control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a production control system, and in particular, a wide variety of products consisting of various types of raw materials or parts are sequentially processed through a multi-stage joining process to complete the product. Production control method in a used production system.

[Prior Art] As a conventional technology, for example, there is a work-in-progress monitoring type apparatus as disclosed in Japanese Patent Publication No. 60-150952.

The conventional production control system includes means for detecting the amount of work in progress in the subsequent process, means for determining the work start sequence of the process according to the amount of work in progress in the rear process, and means for outputting the work start sequence. Next, a conventional production control system will be described in detail with reference to the drawings.

FIG. 2 is a block diagram showing a conventional example.

With this configuration, the post-process work-in-process detecting means 6 is configured to detect the process 1a.
After the work by the production facility 3a is completed, it is detected that the product, that is, the work job 4 has arrived at the work-in-progress storage shelf 2b of the post-process 1b in the flow direction A of the product indicated by the broken arrow.

Then, the post-process in-process amount determination means 8 compares the post-process in-process amount with the predetermined post-process standard in-process amount of the post-process reference in-process amount storage means 7 to determine that the post-process in-process amount is It is determined whether it is larger or smaller than the standard in-process amount.

Based on this result, the process work start order priority rule switching means sets the process work start priority rule of the work start order priority rule storage means 9 per unit time when the post-process work amount is larger than the reference work amount. The rule to reduce the number of completed jobs of the above is switched to the rule to increase the number of completed jobs per unit time when the amount of in-process work is smaller than the standard in-process amount. .

According to the work start order priority rule switched in this way, the process work start order determination means 12 determines the work start order of the work in progress jobs of the process in the process in-process job data storage means 11. Based on this determination, the work start order output means 13 gives a work start instruction of the first priority job to the process 1a among the in-process jobs of the process.

[Problems to be solved by the invention]

In the conventional production control system described above, in the merging section for merging work-in-process works from a plurality of pre-processes to perform the work of the post-process, the work of the plurality of pre-processes is performed in consideration of the merging order of the work-in-process. Since there is no means for changing the starting order, there is a drawback that the equipment operation rate of the subsequent process, that is, the production capacity is reduced.

[Means for solving problems]

According to the production control method of the present invention, a main process route which is one multi-stage continuous process including a first process and a final process is used as a process route of products of various kinds handled by the production system, and one process having this main process route. A means for grouping and storing in a sub-process path that is a single or multi-stage continuous process that merges with each other, and a status of a work-in-progress storage shelf based on a first-in first-out basis corresponding to the process path group that passes through each process for each process. A means for detecting, a means for comparing and judging the magnitude of the post-process in-process amount on the main process route and a predetermined work-in-process reference value, and the preceding process on the main process route according to the determination result; Corresponding to this, means for determining the work start order of the preceding process on the plurality of sub-process paths that join the post-process, means for outputting the work start order, and means for outputting the post-process on the main process path. Predetermined for work-in-progress A means for determining whether or not a work-in-process from the sub-process path that joins the work-in-process arrives at the post-process in-process storage rack, and the determination result. And a means for outputting the status to the preceding process on the sub-process route when no work-in-process from the sub-process route joining the post-process arrives at the post-process in-process storage rack. To be done.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the present invention.
The production control system shown in FIG.
00 and the sub-process path the preceding process 100 ′, 100 ″, the following process 100 which is a joining process of these preceding processes, and the in-process storage shelves 101, 101 ′, 101 ″ of the preceding process.
A work-in-progress storage shelf 101 for the subsequent process, storages 102, 102 ′, 102 ″ installed for each process path group in the work-in-process storage shelf for the subsequent process, and production equipment 103 for each process. 103 ′, 103 ″, 103,
Work in progress 104-104, 105-1 in each process
05, 106 to 106, a production control device 110 such as a computer, a post-process in-process detection means 111, a main process route post-process reference in-process amount storage means 112, a main process route in-process amount determination means 113, Process route data storage means 114, work start priority rule storage means 9, pre-process work start order determination means 115, work start order output means 12, and pre-process work in progress work data storage means 11
And a merged work-in-process arrival detection unit 116 for the main process route work in-process, and the preceding process work change output unit 1
And 17 are included.

The post-process in-process detection means 111 is configured to detect the pre-process 100, 1
Production equipment 103, 103 ', 10 at 00', 100 "
After the work by 3 ″ is completed, in-process works 104, 104 ′, 105, in the storages 102, 102 ′, 102 ″ installed for each process path group of the in-process storage shelf 101 of the post-process in the direction of the dashed arrow A. The arrival of 106 and 106 'is detected.

Then, the main process route in-process amount determination means 113 determines the predetermined main process route post-process reference in-process amount (upper limit Qma).
x, the lower limit Qmin) and the post-process in-process amount Q of the main process route to determine whether the post-process in-process amount of the main process route is larger or smaller than the reference in-process amount.

Based on this determination result, when the main process route post-process work amount is larger than the reference work amount (Q> Qmax), the process work start sequence determination means 115 refers to the work start order priority storage means 9. However, in order to reduce the number of completed works per unit time for the stored work-in-process whose work start order has not been determined, the work-in-process work data storage means 11 can perform a work with a long work time. Prioritize.

On the contrary, when the post-process in-process amount of the main process path is smaller than the reference in-process amount (Q <Qmin), the number of completed works per unit time is increased, so that the work having a short working time is prioritized.

If Qmin ≦ Q ≦ max, the work start order is determined based on a rule defined by the user in advance.

Based on the work start order of the preceding process of this main process route,
The preceding process on the sub-process path that joins the succeeding process is obtained from the process path data storage unit 114, and the work start order of the preceding process on the sub-process path is determined.

The work start sequence output means 12 gives a work start instruction of the first priority work to the preceding processes 100, 100 ′, 100 ″ from the work in process of the preceding process.

Further, in the storage 102 for storing the work in process of the post-process of the main process path, the work in process that joins the work in-process from the sub process path (for example, from the sub process path to the work in process 104 Workpieces to be merged are 105 and 105). A predetermined point is used as a trigger for performing a determination process as to whether or not the workpieces 105 and 105 have arrived at the storages 102 ′ and 102 ″ for storing the workpieces in the subsequent process. The passing of the upper work-in-process is detected by the post-process work-in-process detecting means 111, and the combined work arrival detecting means 11 for the main process route work-in-process is detected.
According to 6, it is determined whether or not the in-process works to be merged have arrived at the storages 102 'and 102 "for storing the in-process works in the subsequent process.

On the basis of this determination result, when the work in process of the post process on the sub process route that joins the work in process of the post process on the main process route has not arrived, the work change output unit 117 for the previous process is performed. Due to this, a work change instruction is given to the preceding process on the sub-process route where the work-in-process has not arrived.

〔The invention's effect〕

According to the production control method of the present invention, the process route of the product is divided into one main process route and a plurality of sub process routes, and the main process route and the sub process route are processed according to the in-process status of the post process on the main process route. By instructing to determine / change the work start order of a process, it is possible to appropriately control the amount of work in process in the preceding process and the subsequent process that are related to each other, and thus improve the production effect of the entire production system. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example. 100 ... Main process route The previous process, 100 ', 100 "
…… Sub-process path the previous process, 100 …… the subsequent process,
101, 101 ′, 101 ″ ... in-process storage shelf of the preceding process, 101 ... in-process storage shelf of the subsequent process, 102,
102 ', 102 "... Installed storage for each post-process in-process storage rack in-process path group, 103, 103', 1
03 ″, 103 ... Production equipment, 104-104, 1
05-105, 106-106 ... Work in progress,
110 ... Production control device, 111 ... Post-process work in progress detection means, 112 ... Main process path post-process reference work quantity storage means, 113 ... Main process path work in-process amount determination means, 114 ...
... process route data storage means 9 ... work start priority rule storage means 115 ... preceding process work start order determination means,
13 ... Work start sequence output means, 11 ... Preceding work in-process work data storage means, 116 ... Main process route work in-process merging work arrival detection means, 11
7 ... The preceding process work change output means.

Claims (1)

[Claims] 1. In a production system in which a wide variety of products consisting of various kinds of raw materials or parts are sequentially processed through a multi-stage joining process to complete the product, the process route of the product is defined as the first process. A main process path which is one multi-step continuous process including the final step and a means for grouping and storing into a plurality of single or multi-step continuous processes which are sub-process paths that join into one process of the main process path; A means for detecting the status of a work-in-progress storage shelf based on a first-in first-out basis corresponding to a process route group that passes through each process, and the amount of the subsequent process in-process on the main process route and a predetermined work-in-process standard. Means for comparing and judging the magnitude with a value, and the preceding process on the main process route corresponding to the judgment result and one or more sub-process routes corresponding to the preceding process merging to the subsequent process Decide the work start order of Means, a means for outputting the work start order, and a work from the width process path that joins the work in process based on a predetermined timing with respect to the work in the subsequent process on the main process path. Means for determining whether or not a workpiece has arrived at the post-process in-process storage shelf, and a process from a sub-process path that joins the post-process in-process storage shelf to the post-process according to the determination result. And a means for outputting the situation to the preceding process on the sub-process path when the work has not arrived.