JPH07175509A - Production simulation device - Google Patents

Abstract

PURPOSE:To reduce the trouble of simulation model generation and describe model data in detail by modifying reference data when a production line is simulated. CONSTITUTION:A reference data generating means 1 totalizes production result data and generates the reference data for a simulation model. Model constitution indication data showing the constitution of the simulation model when the model is generated are inputted by a model constitution setting means 3. A model data generating means 5 generates the simulation model data. A simulation execution means 6 reads in the simulation model data and performs the simulation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production simulation apparatus and method for estimating a product production amount and the like on the basis of data on a production line such as process procedures.

[0002]

2. Description of the Related Art A conventional production simulation apparatus of this type will be described with reference to FIG. When simulating a production line, the reference data such as the process procedure, the number of devices, the device operating rate, and the working time created by the reference data creating means 1 by aggregating the production performance data acquired from the production line management system is the reference data. The simulation model data is automatically created by the model data creation unit 5 from the reference data stored in the storage unit 2, and the simulation is executed by the simulation execution unit 6 (for example, Japanese Patent Publication No. 135958 in 1987).
Issue).

[0003]

In the conventional model automatic generation type production simulation apparatus as described above, the information, which is the basis of the reference data, obtained from the higher-level production line management system is the information when the re-construction occurs. The process procedure data and work time data related to the transportation process are not included in the simulation model. Even if these data are manually input, the simulation model becomes large when the target production system becomes huge, and it takes a lot of time and effort to describe the data, which is not suitable for practical use. Therefore, in the conventional production simulation device, it is possible to perform a simulation with a model that is faithful to the reference data,
It was not possible to perform a simulation with a model that was more detailed than the standard data including data on reconstructing work and transportation process.

[0004]

A production simulation apparatus of the present invention includes a reference data creating unit for creating reference data which is a basis of a simulation model by aggregating production performance data acquired from a production line. Reference data storage means to be retained, model configuration setting means for inputting model configuration instruction data representing the configuration of the model when creating a simulation model, and the model configuration instruction data input by the model configuration setting means Reference data changing means for changing the reference data held in the reference data storage means, model data creating means for reading the reference data and creating simulation model data, and reading the simulation model data for simulation and outputting result data Simulation Characterized in that it is configured to include an execution unit.

[0005]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. FIG. 3 is a conceptual diagram of a process procedure of a production line applied in this embodiment, and as an example, a case of performing a simulation in consideration of rework will be described.

FIG. 3 (A) shows a process procedure when there is no rework, and processes 1 to 5 are sequentially performed. As a process procedure in consideration of the reconstructing procedure, in addition to the form of returning to the process itself in which the reconstructing occurs as shown in FIG. 3 (B), it also returns to a few steps before according to the decided form as shown in FIG. There is a format. FIG. 3 (B) shows a process procedure for returning to process 1 when a request for re-construction is generated in process 1, and FIG. 3 (C) branches from process 5 in which re-construction occurs and when re-construction occurs. It is shown that the process passes through the required process 5'and returns to the process 1, which is the return destination.

The present embodiment will be described with reference to FIG. 1. The reference data relating to the process procedure, which is created by the reference data creating means 1 by taking out data from a higher-level production line management system or the like, is stored in the reference data storing means 2. In the model configuration setting means 3, at which process re-construction occurs,
Model configuration instruction data such as a process to be returned to is input. The reference data changing means 4 creates a rework procedure and modifies the process procedure reference data when the model construction instruction data input by the model construction setting means 3 is instructed.

For example, in the process shown in FIG. 3 (C) when an instruction is issued to reconstruct, the process procedure data is sequentially read, and the storage location of the process 1 data to be returned is detected and stored. , When the data of step 5 is read,
The method of inserting step 5'and adding data returning to step 1 is adopted. It should be noted that the probability that the re-construction of FIG. 3C will occur in steps 1 and 5 in the simulation is set in advance.

The model data creating means 5 creates simulation model data from the changed reference data and simulation parameters which are variables such as work-in-progress data, input data, work time data and operating rate data.
This simulation parameter is input from the host system or is input by a person. The simulation executing means 6 reads the simulation model data, performs a simulation, and outputs the result data.

Normally, when performing repeated simulation, it is sufficient to change the simulation parameter and repeat the model data creating means 5 and the simulation executing means 6, and it is not necessary to create or change the reference data.

When the transport process is included in the simulation, data such as the transport time between the processes and the transport time are designated.

[0013]

By changing the reference data in accordance with the model configuration instruction data, it is possible to easily create a detailed simulation model including the contents of rework and the like, and to improve the simulation accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional production simulation device.

FIG. 3 is a conceptual diagram of process steps of a production line used in the embodiment of FIG.

[Explanation of symbols]

 1 Reference Data Creation Means 2 Reference Data Storage Means 3 Model Configuration Setting Means 4 Reference Data Change Means 5 Model Data Creation Means 6 Simulation Execution Means

Claims (1)

[Claims] 1. A reference data creating unit that collects production result data acquired from a production line to create reference data that is a basis of a simulation model, a reference data storage unit that holds the reference data, and a simulation model. Model configuration setting means for inputting model configuration instruction data representing the configuration of the model when creating the model, and changing to the reference data held in the reference data storage means in accordance with the model configuration instruction data input by the model configuration setting means. And a reference data changing means for adding the reference data, a model data creating means for reading the reference data and creating simulation model data, and a simulation executing means for reading the simulation model data and performing simulation to output result data. Production simulation Device.