JPH04256557A - Preparation method for simulation model - Google Patents

Abstract

PURPOSE:To prepare a simulation model for executing the simulation of the flow of a production lot in a manufacture stage efficiently and correctly. CONSTITUTION:The history of a manufacturing lot is extracted from the history file 1 that a production information system has and stored in a manufacturing lot history file 3 in a manufacture lot history collection device. Then in a process simulation model preparation device, a process procedure difinition table 4, and equipment difinition table 5, equipment operation calender 12 which become necessary in a simulation model are set based on the information of the manufacture lot history file 3. The model preparation mistake and the loss of objectivity caused on human being can be excluded by the complete automation of the difinition information of the process simulation model. Also, the quality of the decision making in the management control of the production system is drastically increased with the behavior of an actual production system being able to be estimated correctly.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a simulation model creation method, and in particular, a simulation model creation method for automatically creating a process simulation model when the detailed actual time of work for each process is known as magnetic information. Regarding.

0002

2. Description of the Related Art Generally, a simulation model for a manufacturing process is composed of a process procedure definition for each product type as shown in FIG. 2, and an equipment definition as shown in FIG.

Conventionally, as shown in FIGS. 2 and 3, the method for creating a process simulation model is to fix the process steps of the manufacturing process, the predetermined standard time for each process, and the equipment information existing in the production system. A method of manually registering the information is used. In addition, in order to bring the fixed model definition closer to the actual state of the manufacturing process, we periodically
Alternatively, from time to time, review of process procedures and work time in the process procedure definition, and review of registered equipment in the equipment definition are manually performed based on actual results.

0004

The fixed model creation method described above has a drawback in that it requires a great deal of effort to maintain information on process procedure definitions and equipment definitions. Secondly, because it is manually reviewed by humans, it has many drawbacks, such as not being able to accurately reflect the actual situation, incorrect settings due to input errors, and subjective settings. Furthermore, since the working time is set in a fixed manner, there are also drawbacks such as the inability to follow subtle dynamic changes in the working time that actually occur.

[0005]

[Means for Solving the Problems] The simulation model creation method of the present invention includes process codes, equipment used, and
A manufacturing lot history collection device that collects work start time and work end time and outputs it to a manufacturing lot history file, and from the manufacturing lot history file, process steps for each product, available equipment for each product and process, and each product and process The present invention is characterized by comprising a process simulation model creation device that obtains the average working time and the operating rate for each equipment, and creates this as model data regarding process definition information, equipment definition information, and equipment operation calendar at the time of simulation execution.

[0006]

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

FIG. 4 is a block diagram showing a process simulation system including an embodiment of the present invention, and shows the overall position of the manufacturing lot history collection device 6 and the process simulation model creation device 7. The manufacturing lot history collection device 6 acquires necessary information from the production information system 9 that manages performance information of the actual production system 10 and creates a manufacturing lot history file 3. The process simulation model creation device 7 reads the information in the manufacturing lot history file 3 and creates process simulation model data 8.
Create. The created process simulation model data 8 becomes input to the process simulator 11. The manufacturing lot history collection device 6 and the process simulation model creation device 7 are activated at necessary timing and create a process simulation model based on the latest data.

FIG. 1 is a flowchart showing one embodiment of the present invention. First, the production lot history collection device 6 extracts the history of production lot start/end reports that occurred during a predetermined period from the history file 1 held by the production information system, and
Product name, lot number, start time, end time, as shown in
A work file 2 composed of a process code and a used equipment code is created (step S1). Next, the product name,
The process codes are rearranged in ascending order to create a manufacturing lot history file 3 (step S2).

The process simulation model creation device 7 sequentially reads the manufacturing lot history file 3, arranges process codes for each product name, and creates a process procedure definition body 4 (step S3). At this time, in this embodiment, it is assumed that when the process codes are arranged in ascending order, they are set in the order of the processes. Next, calculate the difference between the start time and end time within one record, that is, the actual working time, for the same product and the same process code, and calculate the average, and set this as the standard time of the corresponding process in the process procedure definition body 4 ( Step S
4). Next, the sum of the machine numbers in all the equipment groups is taken from the manufacturing lot history file 3, and this is registered as machine number data in the equipment definition body 5 (step S5). Finally, the daily operating rate is determined from the total daily operating time for each equipment number from the manufacturing lot history file 3, and the maximum value is set as the standard operating rate, and the equipment operating calendar 12 is created (step S
6).

FIG. 6 shows a method of creating the equipment operation calendar 12 in this embodiment. Set an arbitrary positive integer N, divide 24 hours into N parts, and set the time in the divided time periods excluding the available operating time corresponding to the standard operating rate as non-operating time in the equipment operation calendar 12. do.

FIG. 7 shows an example of the equipment operation calendar 12. When executing an actual process simulation, non-working time periods are used in the form that work is interrupted.

0012

[Effects of the Invention] The simulation model creation method of the present invention creates and maintains information on process procedure definitions and equipment definitions by automating the creation of process procedure definitions and equipment definitions that are essential for simulating production systems. This has the effect of eliminating the need for labor. Additionally, since there is no human intervention, input errors and loss of objectivity caused by humans can be eliminated, which is an advantage. Another important advantage is that by providing a simulation model that can flexibly and naturally respond to changes in work hours, new equipment, and the appearance of new products that change over time due to changes in the resources and environment of the production system, It becomes possible to predict the behavior of the actual production system, which improves the accuracy of decision-making in the management and control of the production system.

[Brief explanation of the drawing]

FIG. 1 is a flow chart showing one embodiment of the present invention.

FIG. 2 is a diagram illustrating a process procedure definition body that is part of a process simulation model.

FIG. 3 is a diagram illustrating an equipment definition body that is also a part of the process simulation model.

FIG. 4 is a block diagram showing a process simulation system including an embodiment of the present invention.

FIG. 5 is a diagram illustrating a work file extracted by the manufacturing lot history collection device.

FIG. 6 is a diagram illustrating a method for creating an equipment operation calendar in an embodiment of the present invention.

FIG. 7 is a diagram showing an example of an equipment operation calendar according to an embodiment of the present invention.

[Explanation of symbols]

1 History file 2 Work file 3 Manufacturing lot history file 4 Process procedure definition 5 Equipment definition 6 Manufacturing lot history collection device 7 Process simulation model creation device 8
Simulation model data 9 Production information system 10 Actual production system 11 Process simulator 12 Equipment operation calendar

Claims (1)

[Claims] Claim 1: A manufacturing lot history collection device that collects the process code, equipment used, work start time, and work end time for each process of each manufacturing lot actually flowing in the production system, and outputs it to a manufacturing lot history file. , from the manufacturing lot history file, obtain the process procedure for each product, the available equipment for each product and process, the average working time for each product and process, and the operating rate for each equipment, and use this as process definition information and equipment definition at the time of simulation execution. A simulation model creation method comprising: a process simulation model creation device that creates model data regarding information and an equipment operation calendar.