JPH07129672A - Production controller - Google Patents

Abstract

PURPOSE:To allow the actual warehousing quantity to follow a warehousing plan generated in advance, while suppressing goods in process to the minimum, even if an equipment fault, etc., are generated. CONSTITUTION:In a production state grasping means 1, the present state of goods in process and equipment operating state, a production lead time of every process of each separate kind and an actual result value obtained by adding up a cumulative processing amount are accumulated as production state information 8. Subsequently, in a target production quantity calculating means 2, by referring to a process procedure, basic information 7 containing a margin processing amount and the buffer capacity of every separate kind process, a warehousing plan 6 and the production state information 8, a target processing amount 9 of every separate kind process is calculated. Moreover, by referring to the basic information 7, the production state information 8 and the target processing amount 9, a processing speed of every separate kind process is calculated. Next, by referring to the production state information 8 and the processing speed 10, a start job 11 to be started in the next time is selected from a job in a buffer in each process by a priority determining means 4. In the end, by a start instructing means 5, the start of the start job 11 is instructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production control device, and in particular, it is possible to overtake a job in each process to be performed after inputting, and equipment failure affects the order of starting jobs in intermediate processes. The present invention relates to a production control device for controlling a flow of jobs in a production shop at any time so that a job can be stored according to a predetermined storage plan for a production shop to be obtained.

[0002]

2. Description of the Related Art As shown in FIG. 9, a conventional production control apparatus comprises a production status grasping means, a processing speed calculating means, a priority order determining means and a start instruction means.

The production status grasping means receives the production status information from the management device that manages the equipment, and processes it into necessary information. The processing speed calculation means refers to the basic information, the production status information and the warehousing plan to calculate the processing speed for each product type process. The priority order determining means refers to the production status information and the processing speed to select the embarked job to be embarked on next from the jobs in the buffer in each process. Then, the start instruction means instructs the management device managing the facility to start the start job.

Among the above-mentioned means, the processing speed calculation means does not use the predicting function, and if the equipment failure occurs, the processing speed is calculated and the receipt of the job is made to follow the receipt plan while keeping the work in process to a minimum. A method for calculating the processing speed of each process in real time has been proposed (author name: Stanley B. Gershwin, title: hierarchical flow control:
A framework for scheduling and planning discrete events in manufacturing systems (Hierarchical Flow Control: AF
ramework for Scheduling and Planning Discrete Even
ts in Manufacturing Systems), Proceedings of the IEEE, Vol.77, No.1, J
195-209).

Further, as described in the production control device of Japanese Patent Laid-Open No. 62-068260, instead of omitting the processing speed calculation means, the priority calculation means predicts the production progress in the near future with respect to the storage plan. Then, a method of deciding the priority order of the jobs to be started is also proposed.

[0006]

The above-mentioned conventional production control device gives a warehousing plan corresponding to the work plan in the final process for all processes, and therefore the warehousing amount for each product type described in the warehousing plan is If it fluctuates within the planning period,
In particular, in the first half of the process, there has been a drawback that it is difficult to keep track of the receipt of the job according to the receipt plan because the response to the change in the receipt amount described in the receipt plan is delayed. This is particularly remarkable when many types of products having long production lead times are produced.

Further, the method of predicting the production progress in the near future with respect to the warehousing plan and determining the priority of the job to be started in the priority order calculating means is quite large to some extent in order to produce the prediction result. However, there is a problem that it is not necessarily efficient in that it requires a long calculation time and that it is impossible to completely predict disturbances such as equipment failures that occur at unexpected timings in the production shop. .

[0008]

The production control device of the present invention accumulates the current work-in-progress state and equipment operating state, the production lead time of each product type process, and the actual value obtained by accumulating the accumulated processing amount as production status information. Target processing for calculating the target processing amount for each product type process by referring to the production status grasping means, basic information including process procedure, spare processing amount and buffer capacity for each product type process, storage plan and production status information Quantity calculation means, processing speed calculation means for calculating the processing speed for each process by product type with reference to basic information, production status information, and target processing amount, and a buffer for each process with reference to production status information and processing speed Among these jobs, there are provided priority determination means for selecting a start job to be started next, and start instruction means for instructing the start of the start job.

[0009]

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

FIG. 1 is a block diagram showing an embodiment of the production control device of the present invention.

As shown in FIG. 1, the production control apparatus of this embodiment has basic information 7 and storage plan 6 including product information and facility information on a target production shop registered in advance.

First, in the production status grasping means 1, each time the state of the production shop changes, the current work-in-progress status and equipment operating status for each product type process are received from the management device that manages equipment, and the production status is checked. Store in information 8. Further, from the work-in-progress state, the cumulative processing amount and the production lead time for each product type process are totaled and accumulated in the production status information 8 as actual values. Here, the change of the state of the production shop means that an event such as processing start / end at the equipment, equipment failure / restoration, start / end of regular maintenance occurs in the production shop.

In the target processing amount calculation means 2, the storage plan 6,
With reference to the basic information 7 and the production status information 8, the target processing amount 9 for each product type process is calculated.

The processing speed calculation means 3 refers to the basic information 7, the production status information 8 and the target processing amount 9 to calculate the processing speed 10 for each product type process.

Then, the priority order determining means 4 refers to the production status information 8 and the processing speed 10 and starts the next job 11 from among the jobs in the buffer in each process.
Select.

Finally, the start instruction means 5 instructs the management device of the facility where the start job 11 is in progress to start the start job 11.

2 and 3 are explanatory views of the product information and the facility information included in the basic information 7, respectively.

The product information of the basic information 7 shown in FIG.
According to the order of the process procedure of each product type, the process name, the equipment group name processed in each process, the processing time, the buffer name and its buffer capacity, the spare processing amount, etc. are described. For example,
Processing of 6 steps in order from step 1 to step 6 is required before the product 1 is stored. Further, the surplus processing amount is an increase in the processing amount to be added to the target processing amount 9 set for each product type process in consideration of equipment failure. Since the equipment generally breaks down, if the actual production is made to follow the target processing amount 9, there is a high possibility that the actual warehousing will not be in time for the warehousing plan 6. Therefore, when the equipment failure does not occur in a certain process, the equipment processes the job with a target value that is larger than the target processing amount 9. In other words, the cumulative processing amount to be targeted at each time point is (cumulative target processing amount 9 + margin processing amount) for each product type process. Then, by processing the job in the buffer in the period until the equipment failure occurs and the equipment is recovered, the effect of the equipment failure can be suppressed to only the steps near the step as much as possible.

The equipment information of the basic information 7 shown in FIG.
The number of facilities and facility name for each facility group, the operating time of each facility, the scheduled maintenance time zone, and the like are described.

FIG. 4 is an explanatory diagram of the warehousing plan 6. Figure 4
In the storage plan 6 shown in, the quantity to be stored for each product type, delivery date,
Expressed degree and the like are described.

FIGS. 5, 6 and 7 are explanatory views of work-in-progress status, equipment operating status and performance information stored in the work status information 8, respectively.

In the work-in-progress state of the work status information 8 shown in FIG. 5, the name of the job in process in the production shop, the name of the process in process and the equipment currently in process, and the processing in the front buffer of the equipment are waiting. In this case, the waiting time in the case, the remaining work time when the equipment is in process, etc. are described.

The equipment operating status of the work status information 8 shown in FIG. 6 describes the operating status of each equipment in each equipment group and the failure occurrence time when there is a failure.

The record information of the work status information 8 shown in FIG. 7 describes the cumulative processing amount and the production lead time for each product type process. Here, the production lead time is a time required to pass through a process, that is, a time obtained by adding a waiting time and a setup change time to the processing time of the product information of the basic information 7. For this production lead time, the average value within the minimum span of the goods receipt plan 6 is calculated. For example, when the minimum span is a day, the average value of the production lead time of the current day or the day when the process is most recently performed is stored.

FIG. 8 shows the target processing amount calculation means 2
FIG. 6 is a diagram showing a procedure for calculating a target processing amount 9. In the warehousing plan 6, if the warehousing amount of a certain product on the same day and the warehousing amount of the next day are different, it is necessary to change the target processing amount in order to achieve the warehousing amount for each process as time passes. . Therefore, from the production lead time, which is the performance information of the production status information 8, the cumulative time required for the product to be stocked is calculated. Then, the time when the target processing amount 9 is changed is calculated. For example, Figure 8 shows 2 of January 10, 1993.
The target processing amount in each process of the product type 1 at the time between 1:00 and 22:00 is shown.

The processing speed calculation means 3 calculates the processing speed 10 for each product type as a target value for tracking the sum of the accumulated target process amount and the surplus process amount for each product type process. The processing speed 10 of that product type is set to be higher than the processing speeds of other product types as the accumulated processing amount, which is the performance information of the production status information 8, is behind the target value.

In the priority order determining means 4, the production status information 8
Referring to the in-process state described in, when the processing of a job is completed in a certain process, the processing speed 10 for each product type in that process and the job waiting for the processing in the buffer of that process are based on The job 11 to be started next is determined. At this time, among the jobs waiting for processing in the buffer, the job of the type having the highest processing speed 10 is prioritized.

The start instruction means 5 gives a start instruction to the management apparatus that is managing the equipment for the determined start job 11.

As described above, the flow of jobs is controlled while considering the progress of production in the production shop.

[0030]

As described above, since the production control device of the present invention sequentially updates the priority order for starting a job in the equipment according to the production status of the target production shop and the operating status of the equipment, Even if an unexpected disturbance such as a sudden equipment failure occurs, there is an effect that it is possible to realize production control that follows the given target storage amount in a short time.

Also, when the storage amount for each product type in the storage plan varies within the planning period, or when many product types with long production lead times are produced, the actual storage amount is set to the target storage amount. There is an advantage that it can be followed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a production control device of the present invention.

FIG. 2 is a diagram showing product information of basic information in the production control device of the present embodiment.

FIG. 3 is a diagram showing equipment information of basic information in the production control device of the present embodiment.

FIG. 4 is a diagram showing a warehousing plan in the production control device according to the present embodiment.

FIG. 5 is a diagram showing a work-in-progress state of production status information in the production control device of the present embodiment.

FIG. 6 is a diagram showing an equipment operating state of production status information in the production control apparatus of the present embodiment.

FIG. 7 is a diagram showing record information of production status information in the production control device of the present embodiment.

FIG. 8 is a diagram showing a procedure for calculating a target processing amount by a target processing amount calculating means in the production control device of the present embodiment.

FIG. 9 is a diagram showing a conventional production control device.

[Explanation of symbols]

 1 Production status grasping means 2 Target processing amount calculating means 3 Processing speed calculating means 4 Priority determining means 5 Start instruction means 6 Receipt planning 7 Basic information 8 Production status information 9 Target processing amount 10 Processing speed 11 Start job

Claims (3)

[Claims] 1. A production status grasping means for accumulating the progress status of production, a target processing quantity calculating means for calculating a target processing quantity for each process by product type by referring to the progress status, and a target processing quantity for reference. Processing speed calculating means for calculating a processing speed for each process according to product type, priority determining means for selecting a job to start next work in each process, and start instruction means for instructing work start of the selected job A production control device comprising: 2. A production status grasping means for accumulating current work-in-progress status and equipment operation status and production lead time for each process for each product type and actual value obtained by accumulating accumulated processing amount as production status information, and process procedure and product type Target processing amount calculation means for calculating a target processing amount for each process by product type with reference to basic information including a margin processing amount and a buffer capacity for each process, a storage plan and the production status information, the basic information and the production Processing speed calculation means for calculating the processing speed for each process by product type with reference to the status information and the target processing amount; and among the jobs in the buffer in each process with reference to the production status information and the processing speed. 2. The production control apparatus according to claim 1, further comprising: priority determination means for selecting a start job to be started next; and start instruction means for instructing the start of the start job. 3. An actual work time for each process by product type, a setup change time, a production lead time for each process by product type, including an average waiting time and a transfer time, a material delivery time for each process by product type, and a facility capacity by equipment. Target processing amount calculation means for calculating the target processing amount for each process according to the product type, and a value obtained by summing the target processing amount and the margin processing amount calculated based on the average failure occurrence time interval and the average failure recovery time. 3. The production control apparatus according to claim 1, further comprising: a processing speed calculation unit that calculates a processing speed for each process according to the product type.