JPH0615141B2 - Production schedule creation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to scheduling in a manufacturing shop, and in particular, production scheduling mainly for determining the input sequence when a given product type and its amount are given within a predetermined period. Regarding the creating device.

[Conventional technology]

Conventional production schedule technology can be created by skilled workers relying on their experience and intuition while looking at the current shop status, or simply piled up the load of standard working time, or jobs for each process according to predetermined rules. Was to choose.

[Problems to be solved by the invention]

The above-mentioned conventional production scheduling technology has drawbacks such that the production efficiency varies depending on the schedule creator, setup change time due to product type change is not taken into consideration, and a balanced schedule that does not look at the entire system is not created. .

[Means for solving problems]

The production schedule creating apparatus of the present invention includes an input product description section for storing input product types and quantities during a period for which a schedule is to be created, a reference data description unit for storing manufacturing data for each product type, and an input sequence determination algorithm. A rule description part for storing data obtained by making a rule of expert's knowledge, and a plurality of input order plans by rearranging the data in the input product description part based on the data of the rule description part and the reference data description part. Which is the best plan by comparing the simulation results for the plurality of alternatives based on the evaluation function given in advance and the simulation execution unit which executes the simulation for each of the plurality of alternatives created. And a result evaluation section that reports to the operator as a decision input sequence.

〔Example〕

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

FIG. 1 is a block diagram showing the configuration of the first invention.

Before performing scheduling, the operator registers necessary information in each file of the rule description file 2, the condition file 3, the input product file 4, and the reference data file 5 through the input terminal 1.

Here, in the rule description file 2, IF [priority = express goods] THEN [highest priority processing] IF [number of processes = large] THEN [quasi-priority processing] IF [quantity> 100] THEN [highest priority processing] IF [setup group = same] THEN [continuously input] ...

In addition, the product name and quantity of the input product file 3 to be input during the unit period are described as follows.

[A type] [50] [C type] [200] In the reference data file 4, manufacturing data for all types are described as follows.

Next, the input order candidate creation unit 5 creates the following input data from the input product file 3 and the reference data file 4, Further, the rule description file 2 is applied to determine the input semi-candidate, and the result is stored in the input order candidate file 6. Here, the algorithm for determining the input order candidates is as follows.
First, for each rule in the rule description file 2, the IF
Match the contents on the left side in the sentence with the items in the input data, compare the contents on the right side in the IF sentence of the rule description file and the contents of the target items in the input data for all types of input data,
When they match, the relevant product type names in the input data are arranged in the input sequence candidate file 6 according to the priority level of the THEN statement of the rule description file or the order rule. By performing this operation for all the rules in the rule description file, the submission order is performed.

Also, in this process, when the first level ordering occurs, the ordering candidates of the same level are changed to create the ordering candidates, and then all the ordering candidates are added or rearranged. I will go.

Next, the simulation unit 10 determines the simulation model described in the model description file 8 and the current manufacturing shop recorded in the manufacturing progress file 9 for the plurality of injection order candidates recorded in the injection order candidate file 6. A simulation is performed based on the data of the work-in-progress state, and the production lead time, the production completion time, the facility operation rate, and the like are recorded in the simulation result file 11 for each input sequence candidate.

Finally, the result evaluation unit 14 evaluates the data of each submission order candidate in the simulation result file 12 by the evaluation formula stored in the evaluation basic order file 13, and the best one is displayed as the determined submission order in the display unit 15. To display. An example of the evaluation formula is as follows.

Evaluation = C ₀ × (manufacturing lead time) + C ₁ × (delivery margin) C ₁ is a constant + C ₂ × (equipment operation rate) + ... An example of the second invention will be described. The model description file 8 holds two types of models, a rough model and a precise model. At first, the rough model is used to perform the result evaluation, and after selecting the candidates for the order of entry of the upper several proposals, the simulation using the precise model is performed again. A production schedule can be created by final evaluation.

〔The invention's effect〕

The production schedule creation device of the present invention considers many factors related to production at the same time, and incorporates the know-how of the experienced schedule creator using the knowledge base, so that anyone can get a balanced and efficient production scheduling. The effect is that it can be done in a short time.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. 1 ... input terminal, 2 ... rule description file, 3 ... input file, 4 ... reference data file, 5 ... input order candidate creation unit, 6 ... input order candidate file, 7 ... input terminal, 8 ... Model description file, 9 ... Manufacturing progress file, 10 ... Simulation part, 11 ... Simulation result file, 12 ... Input terminal, 13 ... Evaluation reference file, 14 ... Result evaluation part, 15 ... Display section.

Claims (2)

[Claims] 1. An input product description part for storing input product types and quantities during a period for which a schedule is to be created, a reference data description part for storing manufacturing data for each product type, and an expert for an input sequence determination algorithm. A rule description section for storing knowledge-ruled data, and a submission step for rearranging the data in the input article description section based on the data in the rule description section and the reference data description section to create a plurality of submission order plans An order candidate creation unit, a simulation execution unit that executes a simulation for each of the created multiple proposals, and a simulation result for the multiple alternatives are compared based on an evaluation function given in advance to determine the best alternative. A production schedule creation device characterized by including a result evaluation section for reporting to the operator as . 2. A rough and short-time simulation is first performed on a plurality of proposals created by a submission order candidate creating unit, a prescribed number is narrowed down based on an evaluation function given in advance, and a precise simulation is performed again. The production schedule creation apparatus according to claim 1, further comprising a simulation execution unit that executes the result and sends the result to the result evaluation unit.