JP2002073142A - Production schedule generating device and recording medium with recorded production schedule generating program of production schedule generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production schedule generating device capable of generating a production schedule which adjusts the start timing of an initial stage and prevents a residence permissible time from being exceeded. SOLUTION: This production schedule generating device 1 includes a processing time calculating means 11 which calculates the processing time of each production stage of a product to be produced, a priority level determining means 12 which calculates the time interval between the earliest production schedule and the latest production schedule and determines the priority of the object product to begin to be produced, a forward allocating means 13 which allocates the respective production stages of the selected object product to the production schedule by a forward landslide according to the priority level, and a backward allocating means 14 which reallocates the production stages before a production stage having exceeded the residence permissible time by a backward landslide from the production stage having exceeded the residence permissible time when there is the exceeding production stage among the allocated production stages.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production schedule creation device in a production management system for various products.
More particularly, the present invention relates to a production schedule creation device capable of creating a production schedule that does not generate in-process stock exceeding the allowable residence time while complying with the delivery date of a product, and a recording medium recording a production schedule creation program in the production schedule creation device.

[0002]

2. Description of the Related Art Hitherto, a production schedule of a product manufactured by combining a plurality of processes has been created by sequentially allocating each production process by a forward landslide or a backward landslide.

[0003]

However, if a production schedule is created by a forward landslide or a backward landslide as in the prior art, a problem arises if the processing equipment for executing each production process has sufficient processing capacity. However, if the processing capacity of a specific production process (especially after the first process) is not sufficient, creating a production schedule by forward landslides will increase in-process inventory in production processes with insufficient processing capacity. There was a point.

[0004] Furthermore, when the in-process stock increases, the residence time is prolonged, and there is a problem that the retention time exceeds the permissible residence time and quality is deteriorated.

As a result, the conventional production schedule creation method has resulted in frequent schedule modification work and rescheduling.

The present invention has been made in view of the above circumstances, and has as its object to adjust the start timing of the first process in consideration of the operation status of each production process, and to improve the production efficiency when a plurality of products are produced. To provide a production schedule creation device capable of creating a production schedule in which the production schedule is optimized and reducing correction work by improving the accuracy of the production schedule, and a recording medium recording a production schedule creation program in the production schedule creation device. is there.

[0007]

In order to achieve the above object, a production schedule creating apparatus according to the first aspect of the present invention provides a production schedule creating apparatus for producing a production target product produced by combining a plurality of production steps. A production schedule creation device for creating a production schedule, the product-specific production instruction information being information relating to a production schedule and a production quantity of the production target product, and a product being information relating to a production process for producing the production target product. Processing time calculating means for calculating a processing time in each production process of the product to be produced based on the separate process information, and a processing facility for executing the production process and the processing time calculated by the processing time calculating means Calculate the time interval between the earliest production schedule and the latest production schedule based on the operation status of Priority determining means for determining the priority of the product to be produced; selecting the product to be produced in accordance with the priority determined by the priority determining means; and forwarding each production process of the selected product to be produced. Forward allocating means for allocating to the production schedule by landslide, and when there is a production process that exceeds the stagnation allowable time in the production process allocated by the forward allocating means, the production process before the stagnation allowable time is exceeded. The production process includes a backward allocating means for reallocating the production schedule from the production process exceeding the allowable residence time to the production schedule by backward landslide.

According to the first aspect of the invention, it is possible to adjust the start timing of the first process and create a production schedule for preventing the retention time from being exceeded.

In the production schedule creation apparatus according to the second aspect of the present invention, a recording medium recording a production schedule creation program creates a production schedule for producing a product to be produced which is produced by combining a plurality of production processes. A production medium for recording a production schedule creation program in a production schedule creation apparatus, comprising: production instruction information for each product, which is information relating to a production schedule and the number of products to be produced, and production for producing the production target product. A processing time calculation process for calculating a processing time in each production process of the production target product based on product-specific process information that is information on a process; and the processing time and the production calculated in the processing time calculation process. The earliest production schedule and the latest Calculating a time interval with the production schedule, and determining the priority of the product to be started to be produced according to the time interval; and the production target according to the priority determined in the priority determination process. A forward allocation process for selecting a product, and allocating each production process of the selected product to be produced to a production schedule by forward landslide, and exceeding the allowable residence time for the production process allocated in the forward allocation process. When there is a production process, a backward assignment process of reassigning a production process prior to the production process exceeding the permissible residence time to a production schedule from the production process exceeding the permissible residence time by backward landslide is performed. It is characterized by including.

According to the second aspect of the present invention, it is possible to adjust the start timing of the first process and create a production schedule for preventing the retention time from being exceeded.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a production schedule creation device according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a production schedule creation device 1 of the present invention includes an input device 2 for inputting a production instruction and various information of a production target product by an operator, and a production request of the production target product and various information. Host computer 3 to send
A processing device 4 for performing a process for creating a production schedule of a product to be produced, a database device 5 for storing information necessary for creating a production schedule, a display for displaying a production schedule creation result, and the like. And an output device 6.

Further, the processing device 4 includes a processing time calculating means 11 for calculating a processing time in each production process of the product to be produced.
And the time interval between the earliest production schedule and the latest production schedule based on the processing time calculated by the processing time calculation means 11 and the operation status of the processing equipment, and the production target product to start production. Priority determining means 12 for determining the priority order of the products to be produced, and a product to be produced is selected in accordance with the priority order determined by the priority order determining means 12, and each production process of the selected product to be produced is carried out by forward landslide. When there is a forward allocating unit 13 to be allocated and a production process assigned by the forward allocating unit 13 that has a production time exceeding the permissible dwell time, the production process preceding the production process exceeding the permissible dwell time is subjected to the backward landslide. And a backward allocating means 14 for reallocating the data.

The processing device 4 is constituted by a general computer system including a CPU for performing various processes and a storage means for storing instructions for the processing. And the timing constraints are stored in the storage means, and are loaded into the CPU as necessary and executed.

The database device 5 includes a product-specific production instruction information database 51 for storing product-specific production instruction information including information such as a production start date, a delivery date, and a production quantity for each product. A product-specific process information database 52 that stores product-specific process information including information such as a production process and a processing order, and a process development result created based on product-specific production instruction information and product-specific process information. A process development result database 53, an operation pattern information database 54 that stores operation pattern information in which each operation pattern of the processing equipment is defined, and a processing equipment that stores processing equipment information that records an operation pattern when the processing equipment operates. Information database 55 and PERT (Program E
valuation and Review Teqnique)
And a production schedule database 57 for storing the produced production schedule.

Next, the production schedule creation processing by the production schedule creation device of the present embodiment will be described with reference to the flowchart of FIG.

First, the production instruction information for each product is input from the input device 2 by the host computer or other system such as the host computer 3 or another system such as the production management system or the operator (S201). As shown in FIG. 3, the product-specific production instruction information includes information such as the date on which the first process can be started for each production target product, the designated delivery date, and the production quantity. Is stored in FIG. 3 shows production instruction information of the products A, B, C, and D. For example, the production of the product B can be started from 8:00 on April 1 and the delivery date is 14:00 on April 5 And 10
It can be seen that individual production is required.

When the product-specific production instruction information is thus input, the product-specific process information database 52 is searched to obtain product-specific process information (S202). At this time, when there is no product-specific process information of the product to be produced in the product-specific process information database 52, the process may be input from the input device 2 or may be transferred from the host computer 3 or the like.

As shown in FIG. 4, the process information for each product includes, for each product (here, products A, B, C, and D), processing steps to be manufactured, processing equipment for executing the processing steps,
Information such as a processing order, a processing base time per piece, and a permissible dwell time until the next production process is associated with the processing order. For example, according to the product-specific process information in FIG. 4, the product A includes four processing steps of processing 1, processing 2, processing 3, and processing 4, and processing 1 is processing equipment 1.
01, processing 2 is performed in the processing equipment 201, processing 3 is performed in the processing equipment 301, and processing 4 is performed in the processing equipment 401.
It can be seen that this is done in The processing order indicates that the processing steps of processing 1, processing 2, processing 3, and processing 4 need to be performed in this order. In addition, the allowable residence time is such that the processing operation of the processing equipment 201 is started within 60 minutes after the processing of the processing equipment 101 is completed,
It is shown that the processing operation of the processing equipment 301 must be started within 120 minutes after the processing of No. 1 and the processing operation of the processing equipment 401 must be started within 80 minutes after the processing of the processing equipment 301 is completed.

Then, the process is developed based on the product-specific production instruction information and the product-specific process information, and the process development result is stored in the process development result database 53 (S203). In this process development, for each of the products A, B, C, and D, a calculation is performed to determine which processing equipment is used, in what order, and how much processing time (number × base time) is required. And the delivery date designation date and time are obtained from the product-specific production instruction information, and a process development result as shown in FIG. 5 is obtained.

As a result of this process development, for example, for product A, processing equipment 101, processing equipment 201, processing equipment 30
1. Using the processing equipment 401 in the order of 1, 2, 3, and 4 respectively, the respective processing times are 300 minutes, 300 minutes,
It is calculated that 600 minutes and 300 minutes are required, the start date and time is 8:00 on April 1 and the delivery date and time is 18 on April 4.
Time is shown.

Next, the operation pattern information database 54
To obtain operating pattern information, and further search the processing equipment information database 55 to obtain processing equipment information. Based on the information and the process development result, the PERT
The time calculation result is calculated using (Program Evaluation and Review Technique) (S204).

Here, the processing equipment information designates the number of the operation pattern of each processing equipment as shown in FIG. 6, and the operation pattern corresponding to the number is defined by the operation pattern information shown in FIG. You. For example, the operation pattern of the processing equipment 101 is designated as “1” in FIG. 6, but the corresponding operation pattern is from 8:00 to 18:00 every day from April 1 to April 6 in FIG. It is defined to operate for up to 600 minutes.

Based on these information, the PERT
As shown in FIG. 8, the time calculation results calculated as described above include a forward pass, which is the earliest production schedule for each product, a backward pass, which is the latest production schedule, and a forward pass and a backward pass. Float, which is the time interval of, is shown.

For example, for product A,
Production started at 8:00 on the day using the processing equipment 101, and FIG.
As shown in the process development results, a 300-minute operation is performed, then a 300-minute operation is performed using the processing equipment 201, then a 600-minute operation is performed in the processing equipment 301, and finally, the processing equipment 401 is used. A time is allocated to perform 300 minutes of work. On the other hand, as for the product A, since the production can be completed by 18:00 on April 4 at the latest, the time allocation of the processing equipment 401, the processing equipment 301, the processing equipment 201, and the processing equipment 101 goes back from this time. This has been done as a backward pass. Further, a float, which is a time interval between the forward pass and the backward pass, is calculated. The time calculation result thus calculated is stored in the time calculation result database 56.

Next, based on the calculated float of the time calculation result, the priority order for assignment is determined (S20).
5). Since the float is the time interval between the forward pass and the backward pass, a product with a larger float has more time in the schedule. Therefore, the order of priority is determined from products having a small float. For example,
In the time calculation result of FIG. 8, the priorities are determined in the order of products A, B, C, and D.

Next, a product for which a production schedule is to be created is determined based on the determined priorities, and landslide allocation is performed by forward from the first process of the product (S20).
6). In the result of the time calculation shown in FIG.

FIG. 4 shows the allocated production process.
(S207). Here, if a production process that does not fall within the allowable residence time is detected, all the production processes allocated before the production process that exceeds the allowable residence time are discarded (S208), and the discarded production process is deleted. Then, the landslide allocation is performed by backward based on the production process exceeding the allowable residence time (S209).

For example, as shown in FIG. 9, in the allocation of the product A by the forward landslide, no stagnation occurs in the production process in all the processing facilities, so that there is no problem in the allocation of the product A. . However, in the allocation of the product B, a stagnation occurs between the allocation end time of the processing equipment 201 and the allocation start time of the processing equipment 301, and the dwell time is longer than the allowable dwell time of 120 minutes in the product-specific process information in FIG. It is getting bigger. Therefore, the processing equipment 101 and the processing equipment 20
As shown in FIG. 10, the production process of the processing facility 201 is discarded, and the production process of the processing facility 201 is reallocated by backward landslide based on the start time of the allocation of the product B in the processing facility 301. The production process 101 is reallocated by backward landslide.

As described above, when a production process exceeding the allowable residence time occurs, the production process prior to the production process in which the retention has occurred is re-allocated by backward landslide, whereby the allowable residence time can be reduced. Excess can be prevented.

Then, it is determined whether or not the rearrangement by the backward is completed, or if it is within the allowable stay time in step S207, whether or not the allocation of all the production processes is completed (S210). If the allocation of all the production processes has not been completed, the next production process is acquired (S21).
1) Returning to step S206, the allocation of the production process by the forward landslide is performed again. When the allocation of all the production processes is completed, it is determined whether or not the allocation of all the products is completed next (S212). When the allocation of all the products has not been completed, the process returns to step S206 to start the allocation of the next product, and when the allocation of all the products has been completed, the production schedule creating process by the production schedule creating device ends. .

The production schedule created in this way is output by the output device 6 such as a CRT device or a printer, and stored in the production schedule database 57. Here, the production results of the production schedules of the products A, B, C, and D described above are shown in FIG.

As can be seen from the result of the production, according to the production schedule producing apparatus of the present embodiment, the timing of starting the first process is adjusted, so that the production process exceeding the allowable residence time is prevented from occurring. At the same time, the production schedule with the earliest delivery date is automatically created in consideration of the in-process inventory and the facility capacity.

A program for realizing each process of the production schedule creating apparatus 1 described above can be stored in a recording medium, and by reading this recording medium by a computer system, the program is executed to execute the program. , The respective processes of the production schedule creation device 1 described above can be realized.
Here, the recording medium includes a device capable of recording a program, such as a memory device, a magnetic disk device, and an optical disk device.

[0035]

As described above, according to the production schedule creating apparatus of the present invention, the start timing of the first process is adjusted in consideration of the operation status of each production process, and the production in the case of producing a plurality of products is performed. A production schedule with optimized efficiency can be created, and correction work can be reduced by improving the accuracy of the production schedule.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a production schedule creation device according to the present invention.

FIG. 2 is a flowchart for explaining a production schedule creation process in the production schedule creation device 1 shown in FIG.

FIG. 3 is a diagram illustrating an example of product-specific production instruction information.

FIG. 4 is a diagram showing an example of product-specific process information.

FIG. 5 is a diagram showing an example of a process development result.

FIG. 6 is a diagram showing an example of processing equipment information.

FIG. 7 is a diagram illustrating an example of operation pattern information.

FIG. 8 is a diagram illustrating an example of a time calculation result.

9 is a diagram for explaining creation of a production schedule in the production schedule creation device 1 shown in FIG.

FIG. 10 is a diagram for explaining creation of a production schedule in the production schedule creation device 1 shown in FIG. 1;

11 is a diagram showing an example of a production schedule creation result in the production schedule creation device 1 shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Production schedule creation device 2 Input device 3 Host computer 4 Processing device 5 Database device 6 Output device 11 Processing time calculation means 12 Priority determination means 13 Forward allocating means 14 Backward allocating means 51 Product-specific production instruction information database 52 Product-specific process Information database 53 Process development result database 54 Operation pattern information database 55 Processing equipment information database 56 Time calculation result database 57 Production schedule database

Claims (2)

[Claims] 1. A production schedule creation device for creating a production schedule for producing a product to be produced, which is produced by combining a plurality of production processes, wherein the production schedule is information on a production schedule and a production quantity of the product to be produced. Processing time calculating means for calculating a processing time in each production process of the production target product based on product-specific production instruction information and product-specific process information that is information on a production process for producing the production target product And, based on the processing time calculated by the processing time calculation means and the operating status of the processing equipment that performs the production process,
The time interval between the earliest production schedule and the latest production schedule is calculated, and the priority order determining means for determining the priority order of the production target product to start production by this time interval, and the priority order determining means determine the priority order. Forward allocation means for selecting the product to be produced according to the priority order, and allocating each production process of the selected product to the production schedule by forward landslide; and the production process allocated by the forward allocation means. If there is a production process that exceeds the residence time, the production process before the production process that exceeds the residence time is
And a backward allocating means for reallocating the production schedule from the production process exceeding the allowable residence time to the production schedule by backward landslide. 2. A recording medium recording a production schedule creation program in a production schedule creation device for creating a production schedule for producing a production target product produced by combining a plurality of production processes, wherein the production target product is In each production process of the product to be produced, based on the product-specific production instruction information that is information about the production schedule and the number of products, and the product-specific process information that is information about the production process for producing the product to be produced. Processing time calculation processing to calculate the processing time of, based on the processing time calculated in the processing time calculation processing and the operating status of the processing equipment that performs the production process,
A time interval between the earliest production schedule and the latest production schedule is calculated, and a priority order determination process for determining a priority order of a production target product to start production based on the time interval; and a priority order determination process. A forward allocation process of selecting the product to be produced according to the priority order and allocating each production process of the selected product to a production schedule by forward landslide; and the production process allocated by the forward allocation process. If there is a production process that exceeds the residence time, the production process before the production process that exceeds the residence time is
A recording medium for recording a production schedule creation program in a production schedule creation apparatus, comprising: a backward assignment process of reassigning a production schedule from a production process exceeding the allowable residence time to a production schedule by backward landslide.