JP2710212B2 - Production simulation equipment - Google Patents

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 for simulating a production in a production plant, and more particularly, to a simulation which faithfully reflects a state of a production site at that time, and performs subsequent production. The present invention relates to a production simulation apparatus for predicting the situation of a work with high accuracy and determining a way of inputting a work into a production process and a starting order in each facility.

[0002]

2. Description of the Related Art A conventional production simulation apparatus will be described in detail with reference to the drawings.

FIG. 4 is a block diagram showing an example of the related art. The production simulation device shown in FIG. 4 includes an input lot input means 21 for inputting input lot data including a lot name, a product name, a lot size, and a production delivery date of the input lot input to the production line from the production management system 31;
Input lot storage means 22 for storing the input lot data, reference data storage means 23 for storing descriptive data composed of data on production equipment constituting a production line, and data on process procedures of production types; A configuration including a reference data held in the reference data storage means 23 and a simulation execution means for reading the input lot data held in the input lot storage means 22 to form a simulation model and executing a simulation. Is done.

[0004] _Conventional production simulation apparatus described above, for example, _{is shown as a} production situation prediction type production control method _{in JP-A-63-312050.}

[0005]

In the above-described conventional production simulation apparatus, it is necessary to input a work input plan. At this time, in order to accurately simulate the state of production in the factory, the input input plan specifies a certain point in the simulation target period and explicitly specifies what kind of lots and how many are to be input I have to do it.

[0006] In order production type of production plant to produce in response to orders from customers, orders in an environment where demand fluctuates also can not be determined only in the short term within, it can not be determined in advance I _prolonged the input plan.

In such a production plant, therefore, a long-term input plan cannot be input, or only data different from actual input can be input, and the accuracy of a long-term production simulation cannot be improved. drawback that there _Ru. An object of the present invention is to input a long-term requirement and automatically convert it into an input lot, and when a short-term order information is obtained, enter a short-term production quantity and develop from the long-term requirement. By updating the input lot information for the corresponding short-term period and executing the simulation, it is possible to execute a simulation that has improved the accuracy of long-term simulation while maintaining the accuracy of short-term simulation at a high level. It is an object of the present invention to provide a production simulation device capable of performing the above.

[0008]

According to the present invention, there is provided a production simulation apparatus comprising: (A) a long-term required amount storage means for storing, for each product type, a long-term required amount that is required to be produced within a certain period; (B) long-term input lot developing means for creating individual input lot data for each day based on the long-term requirement stored in the long-term requirement storage means such that the total coincides with the long-term requirement. (C) input lot storage means for storing data of daily input lots created by the input lot development means, and (D) for each product type, a required period shorter than the long-term required storage means. A short-term production amount input means for inputting a production amount in a period; and Input lot data And (F) converting a part of the input lot data held in the input lot storage means into the short-term input lot data generated by the short-time input lot expansion means. A lot other than the lot rewritten in accordance with the short-term input lot data so that the total of the production amounts described in the input lot data does not differ from the long-term requirement stored in the long-term required storage means. Input lot updating means for rewriting the input lot data of
(G) data on production equipment constituting a production line,
A reference data storage means for storing reference data _comprising data of process steps in producing varieties, the reference data held by (H) the reference data storing means, introduced to be held by the input lot storage unit Loading lot data constitute a simulation model, _{characterized by comprising} a simulation executing means for performing the execution of the simulation.

[0009]

[0010]

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

FIG. 1 is a block diagram showing one embodiment of the present invention. Production simulation device 10 shown in FIG.
Means long-term storage means 1 and long-term input lot developing means 2
And input lot storage means 3, short-term production quantity input means 4, short-term input lot development means 5, input lot update means 6, reference data storage means 7, and simulation execution means 8.

The production simulation device 10 is used to input data of the long-term required amount and the short-term production amount, or to the production management system 11 for managing and downloading the data of the long-term required amount and the short-term production amount to the production simulation device 10. Is connected to the data input terminal 12.

[0013] The long-term required storage means 1 stores a required quantity, which is a production quantity based on an order prediction for each product type from one month to several months, which is held and downloaded by the production management system 11 or inputted from the data input terminal 12. Remember the amount.

The long-term input lot developing means 2 generates information on input lots within the target period based on the long-term required quantity data stored in the long-term required quantity storage means 1, and generates the generated lots. Allocate to each launch date.

Here, referring to FIG.
_Will be described. First, the average lot size of the lots to be normally input is calculated and stored in the average lot size storage table 102. Lots having a lot size in the average lot size storage table 102 are sequentially generated until the required quantity in the monthly required quantity table 101 is reached. There is also a method in which the lot size is determined using random numbers so that the average value of the sizes of the generated lots matches the average lot size. _To determine _the on date of the generated lots, take the way to assign to input of the period introducing at equal intervals so as to Rights acclimatization. In addition, if it is known that the daily fluctuation of the input amount is cyclic or if there is a certain fixed pattern, the input amount can be assigned so as to match the pattern. The result of the allocation is stored in the input lot table 103. In FIG. 2, the minimum product unit 1
FIG. 4 shows a state where lots 105 each consisting of three pieces 04 are allocated every day.

The input lot storage means 3 stores and holds information on the input lots for each day which are developed and determined by the long-term input lot developing means 2.

The short-term production amount input means 4 inputs and retains production amount data for one week to several weeks, which are stored and downloaded in the production management system 11 or input from the data input terminal 12. The data of the short-term production amount is a production amount based on an actual order received from a customer, and is more accurate data as compared with the long-term required amount.

The short-term input lot developing means 5, like the long-term input lot developing means 2, based on the data of the short-term production quantity input and held by the short-term production quantity input means 4, Generate information. If the short-term production amount directly represents a specific customer order, the processing by the short-term input lot developing means 5 may not be necessary.

The input lot updating means 6 converts the information of the input lot developed from the long-term required quantity and held in the input lot storage means 3 into the short-term input lot developed by the short-term input lot developing means 5 from the short-term production quantity. Update with information. This update _mechanism will be described with reference to FIG.

The input lot information developed from the long-term required quantity is described in the long-term input lot table 201.
The circles in the table represent each input lot. The information of the input lot developed from the short-term production amount is described in the short-term input lot table 202. Short-term input lot table 2
The input date in 02 coincides with the input date in the long-term input lot table 201. The result of updating the content of the long-term input lot table 201 with the content of the short-term input lot table 202 is the input lot table 203. The input lot information within the period of the long-term input lot table 201 replaces the input lot information within the period of the short-term input lot table 202 as it is. However, if the total amount for the short period differs from the total amount for the long period, the long-term production volume may change.Therefore, it is necessary to adjust the input lot information outside the short period. is there. FIG.
The first of _day 6 of the input lot has changed write is of, is for this reason.

The reference data storage means 7 stores reference information _including a process procedure and a processing time necessary for performing a production simulation, worker information, and in-process information.

The simulation execution means 8 reads the reference information held in the reference data storage means 7 and the input lot information held in the input lot storage means 3, generates a simulation model, and executes a production simulation. The simulation executing means 8 may have a function of displaying the result of executing the simulation in the form of a graph or a table.

[0023]

According to the production simulation apparatus of the present invention,
Enter long-term requirements and convert to input lot automatically,
By inputting the short-term production volume when short-term order information is obtained, updating the input lot information developed from the long-term requirement for the corresponding short-term period, and executing a simulation , that _{Sosu the} effect that it is possible to perform the simulation accuracy with improved long-term simulation while maintaining the accuracy of the short-term simulation high.

[Brief description of the drawings]

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

FIG. 2 shows a _mechanism for developing required quantity into input lot information.
It is a _be conceptual diagram.

FIG. 3 shows a _mechanism for updating input lot information developed from long-term requirements with input lot information developed from short-term production quantities.
It is a _be conceptual diagram.

FIG. 4 is a block diagram showing an example of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Long-term required amount storage means 2 Long-term input lot development means 3 Input lot storage means 4 Short-term production amount input means 5 Short-term input lot expansion means 6 Input lot update means 7 Reference data storage means 8 Simulation execution means 10 Production simulation device 11 Production management System 12 Data input terminal 102 Average lot size storage table 103 Input lot table 201 Long-term input lot table 202 Short-term input lot table 203 Input lot table

Claims (1)

(57) [Claims] 1. A long-term requirement storage means for storing, for each product type, a long-term requirement which is a requirement that must be produced within a certain period; and B: a long-term requirement storage means. A long-term input lot developing means for preparing individual input lot data for each day based on the obtained long-term required quantity so that the total coincides with the long-term required quantity; and (C) the input lot developing means. Input lot storage means for storing the data of the input daily lots obtained, and (D) short-term production quantity input means for inputting the production quantity of a shorter period than the required period used by the long-term requirement storage means for each product type And (E) short-term input lot expanding means for creating individual input lot data for each day based on the output data input by the short-term output input means so that the total coincides with the short-term output. And (F) the input The short-term input lot expanding means of the input lot data held in the lot storage means
Period corresponding to the input period of the short-term input lot created in
Minute data is rewritten to the short-term input lot data created by the short-term input lot developing means, and the total of the production amounts described in the input lot data is held by the long-term required amount storage means. Input lot updating means for rewriting data of input lots other than the lot rewritten in accordance with the short-term input lot data so as not to be different from the quantity; (G) data relating to production equipment constituting a production line; (H) reference data stored in the reference data storage means, and input lot data stored in the input lot storage means. And a simulation execution means for executing a simulation by configuring a simulation model by reading Production simulation apparatus characterized by comprising.