JPH03251349A - Manufacture plan making device - Google Patents

Abstract

PURPOSE:To prepare a manufacture plan in a short time by carrying out simulation, controlling the flow of a job in each work center according to the degree of priority in a plan preparation object period, referring to the basic information and production plan, and calculating the manufacture plan. CONSTITUTION:When the plan preparation object period is provided, a processing time calculating means 1 calculates the processing time 8 in each process, in a nonlimited load heap up state, referring to the basic information 5 and the production plan 6, and a job progress calculating means 2 compares the in-process production information 5 and the production plan 7 in the preceding time, and the speed in the progress of each job is obtain, and the progress information 9 is calculated. A calculating means 3 calculates the priority degree 10 of each job, referring to each information, and then, a calculating means 4 develops the job described in the production plan 6 and the in process production plan 5 along the time axis, and simulation of all the processes in a production system is carried out, controlling the flow of the job in each work center, according to the priority degree 10 of the job, and a manufacture plan 11 is prepared. Thus, the manufacture plan can be prepared in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a manufacturing planning device, and particularly to a manufacturing planning device that is constructed from one piece of equipment or a plurality of pieces of equipment having the same functions as each other in a series of process steps. In a production system that targets jobs that include products that pass through a single work center multiple times, the system automatically creates a manufacturing plan that increases production efficiency for a multi-product job production plan given by the host system. The present invention relates to a manufacturing plan creation device for creating a manufacturing plan.

[Conventional technology]

Conventional manufacturing planning devices have a means of accumulating loads at each work center based on the given production plan and production progress information, and a means of accumulating loads at each work center when the load exceeds the capacity of each work center. It consists of a load reduction means that postpones the load amount, and a simulation means that performs a simulation based on the result of load adjustment and outputs a manufacturing plan (for example, NEC Information Processing Manufacturing Equipment Systems Division Group: Practical (See "Production Management System Based on MRP Method," pages 105 to 126, published by Japan Management Association, 1981).

FIG. 2 is a block diagram showing the configuration of a conventional manufacturing planning device. The load accumulation means 12 performs unlimited load accumulation on jobs processed within the plan creation period at each work center. In each work center, the load pile-up means 13 selects a job with little margin for delivery if the load determined by the load pile-up means 12 exceeds the capacity of each work center, that is, the expected operating time of the work center. By assigning them preferentially, the load can be considered and the load can be adjusted. The simulation means 14 uses a dispatching rule that determines the priority starting order of jobs registered in each work center based on the plan in which the load has been adjusted by the load deterioration means 13.
While controlling the flow of jobs and performing simulations,
Create a manufacturing plan.

[Problem to be solved by the invention]

The above-mentioned conventional manufacturing planning device is designed to process jobs in each process that are processed at the same work center in a production system that targets jobs that include products that pass through one work center multiple times in a series of process steps. does not take into account competition. In addition, the load mountain breaking means 13 in Fig. 2 adjusts the load when the load of each work center exceeds its capacity, but if it does not exceed its capacity, it actively controls the flow of jobs. No strategy is planned to do so. For this reason, the production volume, number of products produced, and quantity ratio of each product described in the production plan given by the host system may fluctuate considerably.
When the load balance between processes is disrupted due to equipment failure, etc., there is a problem in that it is difficult to create a manufacturing plan that equalizes the load on the entire production system and secures job delivery dates.

Further, the dispatching rule set by the simulation means 14 is a local job priority starting rule registered in each work center, and the load mountain breaking means 13
It is not necessarily set in a close relationship with the job priority set in . For this reason, the strategy of how to flow jobs in the load mountain breaking means 13 and the strategy of how to flow jobs in the simulation means]4 are not necessarily consistent, and there is no good consistency between local processes. Although it is possible to obtain the starting order of jobs, when looking at the target production system as a whole, it has the disadvantage that it is difficult to control the flow of jobs efficiently.

[Means to solve the problem]

The manufacturing planning device of the present invention refers to basic information including product information, process information, production in progress information, and equipment operation information and the production plan to determine whether each job is completed within a series of process steps within the planning period. A process processing time calculation means that calculates the process processing time for each process when processing is performed a predetermined number of times at each work center based on an unlimited load pile; job progress calculation means that calculates job progress information in comparison with the calculated manufacturing plan; and job priority that calculates the priority of processing the job by referring to the process processing time, the job progress information, and the basic information. manufacturing plan calculation means for calculating a manufacturing plan by referring to the basic information and the production plan and performing a simulation while controlling the flow of jobs at each work center according to the priority within the plan creation target period; It consists of a means and a connotation.

〔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 an embodiment of the present invention. Before starting to create a manufacturing plan, basic information 5 including product information, process information, production in progress information, and equipment operation information regarding the target production system is registered in advance. Furthermore, the production plan 6 of the job given by the host system and the previously created manufacturing plan 7 are also registered in advance.

When the target period for planning is given, process processing time calculation means 1
In this step, the basic information 5 and the production plan 6 are referred to, and the process processing time 8 in each process process is calculated based on an unlimited load pile. Further, the job progress calculating means 2 compares the production in-process information of the basic information 5 with the previous manufacturing plan 7, calculates the slowness or speed of progress with respect to the plan for each job, and calculates job progress information 9. Then, the job priority calculation means 3 refers to the process processing time 8 of the process processing time calculation means 1, the job progress information 1 and the basic information 5 of the job progress calculation means 2, and determines the job priority which is the priority for processing the job. Calculate degree 10. Furthermore, the manufacturing plan calculation means 4 refers to the basic information 5 and the production plan 6, and develops the jobs described in the production plan 6 and the production in-process information of the basic information 5 along the time axis, thereby creating a production system. Simulate all the processes within and output the manufacturing plan 11. At this time,
The job priority 10 of the job priority calculation means 3 controls the flow of jobs at each work center.

3, 4, 5, and 6 are explanatory diagrams of product information, process information, production in progress information, and equipment operation information included in the basic information 5. The product information shown in FIG. 3 describes information such as the number of processes required to produce each product type, and the processing time and setup time in each process in the order of process steps. The process information shown in Figure 4 includes the names of work centers that can be used in each process, the number and names of equipment existing in that work center, the operating hours of each equipment, and the names of the products that can be processed by each equipment. Information such as this is described. The production in-process information shown in Figure 5 includes the name of the job in progress in each process in the production system, the product type name, quantity, delivery date, job priority 10, and the name of the process currently in progress and equipment for each job. Information such as name and work center name is described. The equipment operating information shown in FIG. 6 describes information such as the operating status of the work center and equipment and the expected operating time within the period covered by the plan.

7 and 8 are explanatory diagrams of the production plan 6 and the previous manufacturing plan 7. FIG. The production plan 6 shown in FIG. 7 includes information such as job names for which production instructions have been issued, product type name, quantity, designated input date, delivery date, and job priority level 10 for each job. The previous manufacturing plan 7 shown in FIG. Information such as the scheduled time to start processing and the scheduled time to end processing at the facility is described.

FIG. 9 is an explanatory diagram of the process processing time calculation means 1. First, the job and type of production target described in the production process information of the basic information 5 in FIG. 5 and the production plan 6 in FIG. 7 are determined. Next, each job creates a plan while referring to the process procedure described in the product information of basic information 5 in Figure 3 and the work center name described in the process information of basic information 5 in Figure 4. Find work centers that are expected to be processed within the target period. This is based on the phase of the processing time and setup time described in the product information in Figure 3, starting from the first process in the case of a newly submitted job, and starting from the process currently in progress in the case of a job in progress. A certain work time is added up for each process, and the work centers and processes that are scheduled to be processed are determined until the added value reaches the planning target period. However, if the final process is reached before the planning target period is reached during addition, the job is terminated there. Then, the working time at each work center calculated for each job is sorted by work center and then by process. Furthermore, the total working time of the job is determined for each process, and the process processing time 8a, which is the total value, is determined.

FIG. 10 is an explanatory diagram of the process processing time 8, and shows the process processing time 8 in each process in the order of the process procedure.

Next, job progress calculation means 2 obtains job progress information 9. The 90 process of the in-process position of each job described in the production in-process information of basic information 5 in Figure 5, and the in-process position of the same job that should be in progress at the current time in the previous manufacturing plan 7 in Figure 8. Compare with the process. If the above two in-process processes are different, refer to the process procedure of the product information in basic information 5 in Figure 3 and check how far behind the current actual results are relative to the plan instructed in the previous manufacturing plan 7. Find out if they are there or if they are progressing. Then, by referring to the process procedure, processing time and setup in each process in the product information in Basic Information 5 in Figure 3, calculate the required time between the above two processes, that is, each process located between the above two processes. Calculate the sum of the job processing time and work time in .

This total time is job progress information 9.

FIG. 11 is an explanatory diagram of the job progress information 9, which is the result of calculating the current in-process position of each job, the in-process process in the previous manufacturing plan 7, and job progress information.

FIG. 12 is an explanatory diagram of the job priority calculation means 3.

Figure 12 shows the results of extracting the process to be processed for each work center with reference to the process processing time 8 in Figure 10 and summing up the process processing time 8 for each work center, as well as the basic information in Figure 6. This is a description of the expected operating time of the work center described in the equipment operating information in No. 5.

Here, for jobs processed at each work center,
Set job priority 10. Increasing the job priority level 10 means that when the job priority calculation means 3 performs load reduction and when the manufacturing plan calculation means 4 performs simulation, jobs that are processed preferentially at the work center are selected. It corresponds to deciding. In particular, if the total process processing time 8 exceeds the expected operating time of the work center, as in work center W1 in Figure 12, all jobs scheduled to be processed within the planning period will be processed. Since this is not possible, load adjustment must be performed. In other words, by determining the job priority level 10, it is determined which jobs are to be processed in the work center with priority, and load adjustment is performed.

Load adjustment methods include selecting an appropriate strategy or applying a combination of multiple strategies, taking into account the load status of the entire production system and job progress according to the production status at that time.

For example, if you want to equalize the load on the entire target production system, increase the job flow speed for processes with a large process processing time 8, and slow the job flow speed for processes with a small process processing time 8. There is a need to. Therefore, at work center W1 in Fig. 10, the process processing time is 8.
In step 4, the amount of jobs passing through is increased for a process with a large number of processing times, and in step 1 and step 9, the amount of jobs passing through is decreased in a step with a small process processing time 8. By increasing the job priority level 10 of jobs that are scheduled to be processed within the planning period in step 4, it is possible to control the priority flow of those jobs to the subsequent process of step 4. As a result, the pile of work-in-progress expected to occur in step 4 in FIG. 10 can be eliminated, and the load on the entire production system can be leveled.

Furthermore, when securing a delivery date, the degree of delay can be reduced by increasing the job priority level 10 for a job that has a large delay time with respect to the plan. Therefore, in the job progress information 9, a job priority level 10 is set so that jobs with a longer delay time with respect to the previous manufacturing plan 7 are processed preferentially. For example, job J1 in Figure 11
Since job J1 is behind schedule, job priority 10 is set high for job J1.

FIG. 13 is an explanatory diagram of job priority level 10. 13th
The figure shows the result of increasing the job priority 10 of job J1, which is an in-process job, and updating the value of job priority 10a of the production in-process information in FIG. 5 from 0 to 5. Similarly, in the case of a newly submitted job, the value of job priority 10 is updated in the production plan of FIG. 7.

Furthermore, when securing the number of finished products for a job, that is, securing the number of jobs that come out of the final process, is the top priority, refer to the job progress information 9 and the production in progress information in basic information 5, and set the delivery date as the target for planning. Job priority level 10 is set to give priority to jobs included within the period. For example, if there is a job whose final step is 93 4 in the process shown in FIG.
The job priority level 10 of the job to be processed is set high.

After setting the job priority 10, the manufacturing plan calculating means 4 refers to the basic information 5 and the production plan 6, and calculates the jobs described in the production plan 6 and the production in-process information of the basic information 5 along the time axis. and deploy it to simulate all processes within the production system. At this time, if multiple jobs conflict on each work center during the simulation,
Conflicting jobs need to be selected by priority rules. As a strategy at this time, a job priority of 10 from the job priority calculation means 3 is used. In case of conflict, job priority 1
Processing is given priority to jobs with a higher number of 0, simulation is performed while controlling the flow of jobs at each work center, and a manufacturing plan 11 is output. The manufacturing plan 11 has the same format as the previous manufacturing plan 7 shown in FIG.

〔Effect of the invention〕

The manufacturing planning device of the present invention determines the priority of each job in consideration of the job load processed in each process at each work center, and determines the flow rate of jobs at each work center based on the priority. In order to simulate while controlling, we take into account the unbalance of the process load of the entire production system, the equipment operation status, the progress of the job, etc.
This has the effect of making it possible to create a manufacturing plan in a short time that suits the situation of the production system.

In addition, in a production system that targets a job that includes a product that passes multiple times through a single work center made up of multiple pieces of equipment or multiple pieces of equipment that have the same functions as each other in a series of process steps, It is possible to create a manufacturing plan that takes into account not only the work center load but also the load in the process, controls competition between jobs processed at the same work center, and achieves load leveling.

Furthermore, since the strategy used to reduce the load is consistent with the strategy used in simulation to create a detailed manufacturing plan, a highly reliable manufacturing plan that overlooks the entire production system can be created. There is an effect that it can be done.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a conventional manufacturing planning device, and FIGS. 3 to 6 are basic information shown in FIG. 1. 5 is an explanatory diagram of product information, process information, production in progress information, and equipment operation information, FIG. 7 is an explanatory diagram of the production plan 6 shown in FIG. 1, and FIG. 8 is an explanatory diagram of the production plan 6 shown in FIG. An explanatory diagram of the previous manufacturing plan 7 shown in FIG. 1, FIG. 9 is an explanatory diagram of the process processing time calculation means 1 shown in FIG. 1, FIG. 10 is an explanatory diagram of the process processing time 8 shown in FIG. 1, 11 is an explanatory diagram of the job progress information 9 shown in FIG. 1, FIG. 12 is an explanatory diagram of the job priority calculation means 3 shown in FIG. 1, and FIG. 13 is an explanatory diagram of the job priority 10 shown in FIG. 1. FIG. DESCRIPTION OF SYMBOLS 1... Process processing time calculation means, 2... Job progress calculation means, 3... Job priority calculation means, 4... Manufacturing plan calculation means, 5... Basic information, 6... Production plan,
7... Previous manufacturing plan, 8.8a... Process processing time, 9... Job progress information, 10.10a... Job priority, 11... Manufacturing plan, 12... Load pile up Means, 13... Load mountain breaking means, 14... Simulation means.

Claims (1)

[Claims] By referring to basic information including product information, process information, production in-process information, and equipment operation information and a production plan, each job is assigned to each work center in a series of process steps within a plan creation period. a process processing time calculation means for calculating the process processing time in each process when processed a predetermined number of times in an unlimited load pile; job progress calculation means for calculating job progress information by comparison; job priority calculation means for calculating a priority for processing the job by referring to the process processing time, the job progress information, and the basic information; manufacturing plan calculating means for calculating a manufacturing plan by referring to the basic information and the production plan and performing a simulation while controlling the flow of jobs at each work center according to the priority within the plan creation target period. Characteristic manufacturing planning device.