JPS60183604A - System for controlling progress of production - Google Patents

Abstract

PURPOSE:To quicken response to fluctuation by planning and supervising periodically a pace being an object of progress of production at each work unit at a field managing center and allowing each work unit to decide the order of start of each work based on the pace. CONSTITUTION:The system is constituted with a large-sized computer 1, center microcomputers 2, 3 and each decentralized processing microcomputer 4 coupled by a local area network 5. The center sets the stay, production speed and progress of work as object pace at each work unit based on the daily plan of a high-order system periodically and puts emphasis on countermeasures and supervision on each work unit. When each work unit requests countermeasures as to a fault of pace, the pace is reset. On the other hand, the microcomputer 4 inputs the result and decides automatically the order of start of each job to each work unit, and urges the microcomputer 2 directly not through the center if the preparation of production such as a jig and a drawing is delayed.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a production progress control method for maintaining multi-product product process control, and in particular, for automatically determining the appropriate order for starting work in each work unit. be.

[Background of the invention]

In the conventional control of discontinuous production processes, a large computer is used to plan work schedules for each work unit in a centralized batch manner, and work instructions are issued according to these schedules.

By the way, the production process fluctuates from moment to moment due to equipment breakdowns and interruptions in express work, and each time these changes occur,
It is necessary to maintain existing plans. However, the centralized batch system using large scale machines has the disadvantage that it cannot quickly respond to these production fluctuations.

[Purpose of the invention]

The purpose of the present invention is to eliminate the disadvantages of the production progress control system of the Sochi processing process using a large scale machine as described above, and to quickly respond to momentary production fluctuations and to control the work in each work unit. The purpose of this invention is to provide a production progress control system that can automatically determine the starting order of production.

[Summary of the invention]

The production progress control method according to the present invention allows work to proceed sequentially through a plurality of work units, and provides a center control system for each center of a discontinuous production process in which workpieces are processed.
Each work center is equipped with a distributed processing microcomputer and is connected to each other via a local area network. The target pace of progress, production preparation information, and other information necessary for production quantity are sent to each distributed processing microcomputer, and each information processing microcomputer uses the above information to determine the retention quantity and production rate in the work unit. By measuring and calculating the current allowance for the final completion deadline of the work object, each work unit can independently select the work object to be sent to the next work unit with priority. This is what I did.

The principle will be explained in detail based on the drawings as follows.

Figure 1 is a diagram of the pacemaker system control mechanism for the process, Figure 2 is the retention amount that is a measure of the production progress pace,
FIG. 3 is a conceptual diagram of production speed 9 and workload degree, and is an explanatory diagram of an example of calculation of these scales.

A pacemaker system has been adopted as a system for achieving the object of the present invention, and the control mechanism of this system is shown in FIG.

This pacemaker method divides the production progress control function into a periodic processing function performed at the on-site control center and an immediate processing function performed for each work unit.By controlling the production progress of the process, it is possible to respond to production fluctuations immediately. It is intended to strengthen the

That is, in the process field control center, for example, a center microcomputer (hereinafter referred to as center microcomputer) regularly plans and monitors the target pace of production progress in each work unit. On the other hand, in the work unit, for example, a distributed processing microcomputer (hereinafter referred to as a distributed processing microcomputer) measures the production progress pace each time a work is completed, and compares and analyzes the pace with the target pace. Then, depending on the pace,
Automatically determines the starting order of work, that is, the order of objects to be cultivated (hereinafter simply referred to as objects) that should be prioritized and transferred to the next work unit. Each work unit independently determines the start order of work, using the production progress pace given to each work unit as a criterion for start order. Consistency in production control for the entire broth is achieved by maintaining this production progress pace. As described above, by introducing the production progress pace, a comprehensive measure that expresses the production status, each work unit can take its own countermeasures, thereby enhancing immediacy in response to production fluctuations.

Here, the production progress pace is determined by (1) the amount of accumulation in each work unit, (II) the production speed of that work unit, (ii
i) Work progress indicating the margin from the current time to the final completion deadline of each item, expressed in 03 values.

In other words, the stagnant company becomes a reference value for comparison with the progress speed of work with other work units. When the amount of accumulation increases, this indicates that the progress speed of other work units is also slower than that of other work units, or that one of the work units in the previous stage is progressing unnecessarily.

Production rate is a measure of how much work is being completed on time.

In addition, work progress is a measure that indicates whether or not the object being worked on is currently progressing according to the given deadline, based on the work performance of the work unit so far, and is important in terms of meeting the deadline for completing the object. It is.

These three values are the most basic measures, and even if you pick only one of them, you will not be able to pinpoint the cause of the problem.
By combining the three, it becomes possible to pinpoint the problem.

Next, a specific pace setting method will be explained using FIG. 2.

The above three values are calculated based on the schedule planning results for the production target within the pace setting period given by the host system. The object is given a work unit to pass through, a working time in that work unit, and a deadline for completion of the object.

Now, taking the case of work unit (A2) as an example, if the pace setting period is T1, the number of objects that pass through the target work unit among the objects is N, and each work time is S T +, then the production speed U ! is U2 = ΣS T I (11 wl.By the way, if the processing capacity of this work unit) (A2) is W, then the average working time in the pace setting period is 1
/μ and the average arrival interval 1/λ are as follows.

1/μ=(U/W)Φ(1/N) +211/λ=
T / N (31 Now, assuming that these objects arrive completely randomly, calculate the number of objects that stay on average, and from this value, express the average amount of stay as the residence time by Q-value, it becomes as follows. Here, na is the number of accumulated particles that occur, and n*am@
is the maximum retention number.

Also, the number of remaining work units of this item is t, and the completion deadline is D.
If T, the unit deadline d for this work unit is given by: However, STS and QJFi are the remaining work time and average residence time of each work unit.

The work progress is measured based on this value.

The pace is determined by predetermining the maximum and minimum values of these values and treating those within the range as normal and those outside the range as abnormal.

Furthermore, the processing functions of each work unit will be explained using FIG. Each work unit automatically determines the starting order of work based on the target base given by the company or center. Since one decision function is distributed to each work unit in this way, a dispatching rule suitable for local optimization can be used as a decision method, rather than a method based on complicated scheduling. Here, the dispatching rule is a method of assigning a priority order to winter items when selecting one item from among the items stuck in front of each work unit, and determining the order in which the work starts according to this. be. As a measure for indicating the priority order, for example, there is a minimum time priority rule based on the working time of each task, and various rules can be considered depending on what measure is taken. Therefore, each work unit prepares several dispatching rules and switches them at the appropriate time according to the production progress base, thereby automatically determining the optimal order for starting work. For example, if the amount of accumulation increases abnormally, a minimum work time priority rule is used to prioritize work that requires a short work time. Furthermore, when the production speed has decreased, the production speed can be reduced to 4@11 by switching to a rule that minimizes the setup time. In addition, for abnormalities that cannot be dealt with autonomously by the work unit, the on-site management center is requested to take measures.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

FIG. 4 is a basic configuration diagram of an embodiment of a process using the production control progress method according to the present invention, and FIG. 5 is an explanatory diagram of the processing contents.

Here, 1 is a large computer related to the central processing unit, 2 is a center microcomputer for the tool center, 3 is a center microcomputer for the site management center, 4 is a distributed processing microcomputer for the work unit, and 5 is a local area network. (LAN).

As shown in FIG. 4, this method uses a large computer 1 to
For example, it is operated in real time based on a schedule planning system that is operated once a week in batch mode and a CAD+1CAM system (computer design and manufacturing system). In order to smoothly perform this real-time production progress control, a distributed processing microcomputer 4 is introduced for each work unit consisting of one to several machine tools. In addition, we introduced a center microcomputer 2 for the jig and tool center that processes information on these tasks and production preparation for jigs and tools.
By connecting microcomputers such as 2" and 2" through a local area network 5, which is a high-speed communication means, schedule R1 information 9, production preparation information such as jigs and tools, and work progress information in other work units can be transmitted. information necessary for production is sent to each work unit in a timely manner.

Based on this transmitted information, the distributed processing microcomputer 4 of each work unit automatically determines the starting order of work in synchronization with the flow of goods. In addition, as each work is completed, the actual results are human-powered, and the on-site management is performed using real tights! l! It is sent to the center or other work units.

The structural contents of the processing will be explained with reference to FIG.

At the center, periodically, the top 7 Sudem σ Month d%: n 1 Ryo K At'zu^, each 1" 14 industrial units IL mark paste sheet 1, Ura trade: 11. Production union 1 round 0 work progress 1 setting In addition, we will carry out focused measures and monitoring on the raw progress basis of the entire process.

In addition, each work unit is asked to respond at a different pace.
In the case of RTP-, measures such as increasing capacity and designating an alternative work unit are taken, and the pace is reset.

On the other hand, in the work unit, the distributed processing microcomputer 4 inputs actual results and automatically determines the start order of work.

Note that for items such as jigs and drawings that are delayed in production preparation, they can be directly requested to the jigs and tools center without going through the center.

In this way, in this method, each work unit collects schedule planning information, production preparation information, and progress information in other work units in a timely manner, and automatically determines the work start order in response to production fluctuations. In order to improve the operating rate of the entire process and complete the compound, the application of the "Limit 1111 Law" t1! can be expressed.

〔Effect of the invention〕

As described above in detail, according to the present invention, abnormalities in the production progress of the production process can be detected in real time in each work unit, and countermeasures can be taken in real time. Shortening the process, increasing the utilization rate of the entire process, and increasing the efficiency of the process, a remarkable improvement can be obtained.

A simple explanation of the mouth opening Figure 1 is a diagram of the control mechanism of the Pe-Sume-Roku system against Zoroses, and Figure 2 is the l'lk station II, which is the scale 1u of the production progress pace! ', ,A conceptual diagram of the production progress of 1 unit, 1 work progress, Figure 3 is an explanatory diagram of an example of calculation of the shaku melon, and Figure 4 is a diagram of the production progress and control system according to the present invention. Figure 5 is an explanatory diagram of the same processing.

l...Large tlt'(t<")+fi, 2.3...
Center microcomputer, 4... minutes 11 processing microcomputer, 5...
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Claims (1)

[Claims] 1. A center microcomputer is installed at each center of a discontinuous production process in which work is sequentially passed through multiple work units and processed work objects, and it is also distributed to each work center. A processing microcomputer is installed, and they are connected to each other by a local area network. i1-71 (row C
゛The pace is also sent to the production prefecture 1; 1 information and other necessary information is sent to the processing unit 11 (processing machine = I); Fill W4 in the unit, production xlj concealment and individual work system: 1 by measuring the current surplus fht for the final completion date of the item.
, a production progress control system that allows each work unit to independently select work objects t-n to be sent to the relevant work unit with priority;