JP2002244714A - Production plan planning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently allocate a time frame of each working process of a product for each working equipment. SOLUTION: In this production plan planning method for allocating the time frame of each working process in a plurality of products which have each of a plurality of working processes and are produced by using plural kinds of working equipment to each working equipment, the date and hour to be changed is stored when working equipment adopted in the working process is changed within a production period of the product in each working process of each product. When the time frame of the process is allocated to each working equipment, working equipment to be allocated is determined based on which side of the date and hour to be changed the date and hour to be allocated belongs to.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production planning method for producing a production plan for a plurality of products each having a plurality of processing steps and produced using a plurality of types of processing equipment.

[0002]

2. Description of the Related Art When planning a production plan for a plurality of products each having a plurality of processing steps and using a plurality of types of processing equipment, the number of products (the number of orders) for each product and the start of production Manufacturing instruction information such as possible dates and delivery date designation dates, required processing steps (JOB) for each product, processing equipment used in each processing step (JOB), processing order (JOB order) in processing equipment, and each processing step Item-specific process information such as the required time (processing base time) in (JOB) is prepared in advance.

[0003] Then, for each processing equipment, each processing step (JOB) of a product to be sequentially manufactured is defined as a reference time obtained by multiplying the number of products required for the relevant processing of the corresponding product by a required unit period (the time of each processing step). The production schedule has been drafted by arranging the time frames of the (reference value) in the order of elapse of time from the production start date. It is to be noted that a method of drafting a production plan by arranging the respective time frames in the reverse order of the time elapsed from the designated date of delivery date in the reverse order of the process is also adopted.

[0004]

As described above, in the method of planning, in which the time frames of the reference time required for each processing step of each product (the reference value of each step) are simply arranged in order, If the processing instructions of each product and the conditions of each processing facility are unchanged during the period from the planning to the actual start of production, if the processing capacity of all the processing equipment is sufficient, There is no problem if a production plan is made in reverse order.

[0005] However, due to variations in production forms such as diversification of production varieties and changes in production volume, specific varieties,
Due to a change in processing equipment employed for a product, it may be necessary to draft a product production plan for a product order in which the above-mentioned reference values of each process fluctuate.

In such a case, the work time and work procedure of each process are determined based on the reference values applied at the beginning of the planning and the planning is performed. There is no guarantee that the reference value of each process always matches the reference value at the time when the reference value was changed due to a change in the adopted processing equipment. For this reason, it has not been possible to make a production plan in anticipation of the occurrence of a plan change operation immediately before the reference value change date and time or a change in the reference value.

[0007] Further, as a method of drafting a production plan, in order to prevent each processing step from being overlapped between products near the production start time caused by arranging the time frames of each processing step in order from the production start date. First, a forward landslide process is performed to equalize the load on each processing facility. In addition, in order to prevent each process from being duplicated between products near the specified delivery date, which is caused by arranging the time frame of each processing process in the reverse order from the specified delivery date in the reverse direction, the backward mountain collapse is performed. Perform the processing,
The load of each processing equipment is leveled.

[0008] In such a production plan based on the forward landslide process or the backward landslide process, the load is concentrated in the first half or the second half when the production volume is small because the allocation is performed with the full capacity of each processing facility. However, a plan in which the load was sufficiently leveled was not drafted, and load adjustment work by human systems was frequently used.

Further, since the load of each processing equipment is not sufficiently leveled, if an order for an additional product is generated after the production plan is prepared, even if the production period from the date when production can be started to the date and time when the delivery date is specified, Even if there is room in the overall equipment capacity, it is necessary to restart the production plan from the beginning, including each product to which the time frame of each processing step has already been allocated. This required a great deal of time and effort.

[0010] The present invention has been made in view of such circumstances, and stores the date and time of change when each processing facility is changed within the production period, thereby enabling each manufacturing facility to manufacture each product. It is an object of the present invention to provide a production plan drafting method that can automatically allocate a time frame of a process within a production period to a correct processing facility at that time and efficiently and accurately produce a production plan for each product. I do.

Further, in addition to the above object, the load of each processing equipment can be distributed during the production period, and even when an order for an additional product is generated, the processing steps of the already allocated product are almost changed. It is an object of the present invention to provide a production planning method capable of easily allocating the process of the additional product to each processing facility without performing.

[0012]

According to the present invention, a time frame for each processing step in a plurality of products each having a plurality of processing steps and produced using a plurality of types of processing equipment is allocated to each processing equipment. Applied to production planning methods.

In order to solve the above problem, in the production planning method of the present invention, in each processing step of each product, the processing equipment employed in the relevant processing step is changed within the production period of the relevant product. In this case, the date and time of the change is stored. Next, when allocating the time frame of the process to each processing facility, the processing facility to be allocated is determined based on which side of the change date / time the allocated date / time belongs.

In the production planning method configured as described above, since the date and time when the processing equipment employed in the processing process is changed during the production period of the corresponding product is stored, each product is manufactured. When the time frame of each manufacturing process to be performed is allocated within the production period, the time frame is automatically allocated to the correct processing equipment at that time.

According to another aspect of the present invention, in addition to the production planning method of the invention, a time frame of a plurality of virtual loads distributed over the production period is allocated to all or a part of the processing equipment. In addition, a time frame of each processing step in a plurality of products is allocated to each processing facility at a time excluding a time in which a plurality of virtual load time frames are allocated.

In the production planning method configured as described above, a time frame of a plurality of virtual loads distributed to each processing facility is set in advance. Therefore, when the time frame of each processing step in each product is allocated in this state, the time frame of the virtual load is actually an idle time, and the load state of each processing equipment during the production period is equalized.

Further, in another aspect of the invention, in the production planning method of the invention described above, when the time frame of the product is assigned to a time excluding the time to which the time frame of the virtual load is assigned, the time frame overlaps. In such a case, the time frame in which the overlap has occurred and the time frame of the virtual load in the vicinity thereof are deleted, and the time frame of the machining process of the product which overlaps with the time including the deleted time frame is assigned.

In the production planning method configured as described above, in each processing equipment, the time frame of each actual processing step excluding the virtual load is arranged in a distributed manner. Even if the above order is generated, the processing steps for the additional product can be easily allocated to each processing equipment with almost no change in the processing of the already allocated product.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart illustrating a production planning method according to the embodiment.

The virtual load information 2 is provided by various input means 1 such as a host computer, another system, and input of a manufacturing request. As shown in FIG. 2, the virtual load information 2 includes a virtual load assignment start date and time, a virtual load assignment end date and time, and a virtual load assignment end date and time for each processing facility (here, the processing facilities 101, 201, and 401).
This is information in which the load time per day is associated.

In the example shown in FIG. 2, for example, the processing equipment 101 has a virtual load of 120 from 8:00 to 10:00 on April 1.
It is specified that a minute load frame (time frame) is required.

(1) Then, in step S1, virtual load deployment processing is performed. That is, based on the virtual load information 2 described above, a virtual load is created for each processing facility on a daily basis, and the result is stored and held as a virtual load development result 3 shown in FIG. 3, for example, in a file of a magnetic disk device. For example, in the virtual load deployment result 3, as shown in FIG. 3, in the processing facility 101, from April 1 to April 5
A time frame of a virtual load of 120 minutes is allocated from 8:00 to 10:00 in the morning until the day.

(2) Next, in step S2, a process development result creation process is performed. The item-specific production instruction plan information 4 is input by the input means 1 such as a host computer, another system, and a production request. This item-specific production instruction plan information 4
As shown in FIG. 4, the production items (here, products A, B,
C, D) is information in which a start possible date and time, a delivery date designation date and time, and a production instruction quantity (number of orders) are associated with each other. For example, the production of the product A can be started from 8:00 on April 1 and the delivery date is 18:00 on April 4, and it is required to produce 10 pieces. In addition, 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,
It is required to manufacture ten pieces.

As shown in FIG. 5, the item-specific process information 5 includes, for each manufactured item (here, products A, B, C, and D), a processing step in which it is manufactured, and the processing step. This is information in which equipment to be executed, a processing order of manufacturing using the equipment, a processing base time per piece, an operation start date of item-specific process information, and an operation end date are associated with each other.

For example, for the product A, there are four processing steps of processing 1, processing 2, processing 3, and processing 4. The processing 1 is performed by the processing equipment 101, and the processing 2 is performed by the processing equipment 201. The processing 3 is performed in the processing equipment 301,
It is specified that the processing 4 is performed in the processing equipment 401. The processing order of processing 1, processing 2, processing 3, and processing 4 indicates that the processing steps need to be performed in this order.

The item-specific process information 5 is stored and held in a magnetic disk device or the like in advance.

Then, based on the above-mentioned item-specific production instruction information 4, the process is developed in accordance with the processing order of the item-specific process information 5, and the result is obtained as a process expansion result 6 shown in FIGS. And keep it in a file.

Specifically, 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 (production quantity × base time) is required. Then, the start date and time and the delivery date designation date and time are obtained from the product-specific production instruction information 4 shown in FIG. 4, and the process development result 6 shown in FIGS. 6 and 7 is obtained.

For example, for the product A, the processing equipment 10
1, processing equipment 201, processing equipment 301, processing equipment 401
Are used in the order of 1, 2, 3, and 4, and it is calculated that each processing time requires 300 minutes, 300 minutes, 600 minutes, and 300 minutes. The fact that the designated date and time is 18:00 on April 4 is derived from the item-specific production instruction information 4 in FIG.

Further, in this step S2, for each of the products A, B, C, D, which processing equipment is used,
In the case where information on what order and how much processing time is required is switched in the middle of the production period, a determination is made using the application start date and the application end date, and the process development result 6 shown in FIGS. Write to.

For example, according to the process development result 6 in FIGS. 6 and 7, for example, for the product D, the processing equipment 101, the processing equipment 201, the processing equipment 301, the processing equipment 302, the processing equipment 401, and the processing equipment 402 1,2,3,3,4,4
The application start date is March 1, 3
March 1, March 1, April 4, March 1, April 4, and end dates for April 3, April 3, April 3, April 30
Days, April 3, April 30.

In this example, the processing equipment 301 (JOB1
5, before April 3) and processing equipment 302 (JOB16, 4
4), processing equipment 401 (JOB17, before April 3) and processing equipment 402 (JOB18, after April 4)
This indicates that even if the processing operation is the same, the processing equipment is switched depending on the application date (execution date) of the processing operation.

(3) Next, in step S3, PE
Perform time calculation processing by RT. For example, as shown in FIG. 8, the processing facility information 7 stored in the magnetic disk device is information on an operation pattern for each of the processing facilities 101 to 402. Further, the operation pattern information 8 also stored in the magnetic disk device includes, as shown in FIG.
This is information on the operating hours of the day. For example, the processing equipment 101
When the operation pattern of “1” is designated as “1”, the corresponding operation pattern indicates that the operation is performed for 600 minutes from 8:00 to 18:00 every day from April 1 to April 6.

In this step S3, the earliest start time, the earliest end time, the earliest end time, and the like for the manufacturing item are determined based on the process development result 6 created in step S2 and the processing equipment information 7 and the operation pattern information 8 described above. The latest start time, latest completion time, float (time to spare) etc.
ERT (Program Evaluation an
d Review Technology), and the result is stored as a time calculation result 9 (9a, 9b, 9c) in, for example, a file of a magnetic disk device.

More specifically, for each of the products A, B, C, and D, a PERT diagram 9a shown in FIG. 10 composed of a forward pass, which is the earliest production schedule, and a backward pass, which is the latest production schedule. Is calculated.

For example, when the time allocation is performed for the product A by the forward pass, the production is started at 8:00 on April 1 at the earliest using the processing equipment 101, and as shown in the process development result 6 in FIGS. , 300 minutes, and then production using the processing equipment 201, and as shown in the process development result 6 in FIGS. 6 and 7, 300 minutes, and then production using the processing equipment 301. 6, as shown in the process development result 6 in FIG.
It takes 00 minutes, and finally it is produced using the processing equipment 401,
As shown in the process development result 6 in FIG. 6 and FIG. 7, a time allocation requiring 300 minutes is made.

On the other hand, if the time allocation is performed for the product A by the backward pass, the product A may be completed by 18:00 on April 4 at the latest. 301, processing equipment 201,
The time allocation of the processing equipment 101 is performed.

Here, the time allocation for the product D will be verified. As to the product D, as described above, applicable processing equipment differs between before April 3 and after April 4. As described above, for products whose processing equipment is switched according to the application date, the reference value of the corresponding processing step determined using the capacity of the processing equipment currently applied (before April 3) is used. The PERT calculation 9b for each of the JOBs 13 to 18 shown in FIG. 11 is calculated, and the JOBs 13 to 18 shown in FIG. 11 are used using reference values determined using the capacity of the processing equipment to be switched in the future (after April 4). 18 P
The ERT calculation result 9b is calculated.

Next, a correction process for switching the application date is performed on the created PERT calculation result of the product D. That is, each of the jobs 13 to 13 in the product D in FIG.
In the search range 9c of each of the jobs 13 to 18 of the product D shown in FIG.
The search range of each JOB 13 to 18 is corrected using the application start date and the application end date. For example, the search period of the job 15 (from 8:00 on April 2 to 13:00 on April 6) is corrected to the search period before the change of the application date (from 8:00 on April 2 to 18:00 on April 3).
This correction result is stored and held as the correction result 9d of the PERT calculation of the product D shown in FIG.

(4) Next, in step S4, virtual load allocation processing is performed. That is, based on the virtual load development result 3 shown in FIG. 3 created in step S1, the allocation of the virtual load is alternately arranged in the first half or the second half of the day on a daily basis, and the result is shown in FIG. The load allocation result 10 is stored and held in a memory file, for example.

For example, the virtual load of the processing equipment 101 is 4
For the first day of the month, it is arranged from 8:00 to 10:00 on April 1,
On April 2nd, it is arranged from 16:00 to 18:00, and 4
For the third day of the month, it is arranged from 8:00 to 10:00,
The day is arranged from 16:00 to 18:00, and the April 5 is arranged from 8:00 to 10:00. Next, the virtual load of the processing equipment 201 is arranged from 8:00 on April 1 to 10:00 on April 1, and 16
From 18:00 to 10:00, on April 3 from 8:00 to 10:00, and on April 4, from 16:00 to 1
It is located at 8:00 and on April 5 it is located from 8:00 to 10:00.

Further, the processing equipment 401 is arranged from 8:00 on April 1 to 10:00 on April 1 and
About 2nd month, it is arranged from 16:00 to 18:00, about 3rd April, it is arranged from 8:00 to 10:00, about 4th April, it is arranged from 16:00 to 18:00, and about 5th April It is located from 8:00 to 10:00. The job of each of the above-described products is allocated in a time period in which the virtual load in the virtual load allocation result 10 is not allocated.

Therefore, by arranging (allocating) the virtual loads alternately in the first half and the second half of the day in units of time buckets in this manner, the actual loads related to product processing in each processing apparatus are made uniform. be able to. Furthermore, since a continuous free load (virtual load) can be secured over two days, when an additional product order is generated later, the time frame arrangement (assignment) of each processing step in the order across time buckets is performed. It becomes possible.

(5) Next, in step S5, landslide allocation processing by forward is performed. That is, FIG.
The forward landslide allocation is performed based on the item-specific process information 5 shown in FIG. 5, the time calculation result 9 (9a, 9c, 9d) created in step S3, and the virtual load placement result 10 created in step S4. The schedule results (before overload adjustment, products A to C) 11 shown in FIG. 15 and the schedule results (before overload adjustment, products D) 11a shown in FIG.

Here, FIG. 14 created in step S3
15 and 16, since the virtual load is already framed in the morning or evening of each day in the virtual load arrangement result 10 shown in FIG.
As shown in the figure, the allocation of the product order is calculated in the time calculation result 9 (9a, 9a, 9b) in a range excluding the load frame (time frame) by the virtual load from the operable time frame of each of the processing equipments 101 to 402.
According to 9c, 9d), each of the JOBs 1 to 1 is set within the range from the early start date / time to the latest start date / time or the early completion date / time to the latest end date / time.
The assignment of 8 is performed in order.

At this time, the process information 5 for each item is compared with the application start date and the application end date of the designated processing equipment and the date and time of the allocation position by the allocation process, and the allocation of the job to be applied is appropriately changed. In addition, it is possible to synchronize the application date and time of the reference value determined using the processing equipment employed in each processing step of each product with the processing equipment to be assigned.

Further, by allocating the manufacturing order after framing the time frame of the virtual load, each of the processing equipments 101 to 40 can be used in the forward and backward landslide allocation.
It is possible to formulate a production plan in which the load of level 2 is leveled.

FIGS. 15 and 17 show specific examples of the above-described effects.
This will be described using the schedule results 11 and 11a. This forward landslide allocation processing is performed for products A, B, C,
When applied to the embodiment of the present embodiment in which manufacturing is performed as the allocation order of D, the schedule result (before overload adjustment) shown in FIG.
In the case of No. 1, in the forward landslide of the products A, B and C, the allocation state in all the processing facilities 101 to 402 is within the allocable range, so that there is no problem in the result of the forward landslide.

However, in the schedule result (before overload adjustment) 11b of the product D shown in FIG. 16, there is no problem because the job 13 is allocated within the search range.
Since the assignment end date and time of B14 is after April 4, the application end date and time of the product D in the processing equipment 301 is April 3 1
Since it is 8:00, it is out of the search range of JOB15.
Therefore, there is no need to assign JOB15.
The OB 15 is discarded, and the job 17 is newly assigned to the processing facility 302 by the product D applied from 8:00 on April 4th.

Further, as a result, the assignment end date of JOB 17 is out of the search range of JOB 16, so that there is no need to assign JOB 16. Therefore, JOB 16 is discarded, and JOB: 18 is newly assigned in the processing facility 402 by the product D applied from 8:00 on April 4th.

As described above, by appropriately changing the assignment of the time frame of the job to be applied, it becomes possible to synchronize the application date and time of the reference value with the assigned job.

As described above, the time frame of each manufacturing process for manufacturing each product is set based on the change date and time when the processing equipment employed in the processing process is changed during the production period of the product. When it is assigned within, it is automatically assigned to the correct processing equipment at that time.

(6) Next, in step S6, Ove
Perform rload processing. That is, the schedule results created in step S5 (before overload adjustment, products A to
C) 11, Schedule result (before overload adjustment, product D)
11a, the virtual load assigned in step S4 is assigned to the manufacturing order in the overload state.
The virtual load of the processing equipment that is the target of the rload is applied, the landslide allocation is performed again by forward, and the result is set as a schedule result (after overload adjustment) 12.
For example, it is stored in a memory file.

The Overload process will be described by taking as an example a case where allocation to a product E of an additional order is performed for products A, B, C, and D that have already been allocated to a production plan.

The product E of the additional order is shown in FIG.
Is assumed to have the item-specific production instruction information 4e shown in FIG. According to the assumed product-specific production instruction information 4e, the product E
Are created from 8:00 on April 1 to 18:00 on April 4th. In addition, for this product E, FIG.
Are predetermined in advance. According to the item-specific process information 5e, the product E is
1, processing equipment 201, processing equipment 301, processing equipment 401
The application start date of each of the processing equipments 101 to 401 is March 1 and the application end date is April 30.

Using the production instruction information 4e for each item and the process information 5e for each item, the process development result creation process of step S2 described above is performed to calculate the process development result 6e of the product E shown in FIG. Process development result 6 of this product E
In e, by multiplying the processing base time of each facility in the item-specific process information 5e by the production quantity of the item-specific manufacturing instruction information 4e, the processing time in the processing equipment 101 (JOB19) is 150 minutes, and the processing equipment 201 (JOB20). , A processing time of 450 minutes in the processing equipment 301 (JOB21), and a processing time of 450 minutes in the processing equipment 401 (JOB21).

Further, in the time calculation processing by the PERT in step S3, the PERT of the product E shown in FIG.
e, the PERT calculation result 9de of the product E shown in FIG. 20, and the allocation search result 9ce of the product E shown in FIG. 21 are calculated. In the calculated search result 9ce for the product E, the restart start date and time and the restart end date and time are calculated forward from the date when the first process can be started, and the latest start date and time and the latest end are calculated backward from the delivery date designation date and time. The date and time are calculated.

As a result, as for the product E, as shown in FIG. 21, 8:00 on April 1 is the earliest start date and time, and the earliest end date and time is 18:00 on April 2nd. Also, April 3, 8:
00 is the latest start date and time, and 18:00 on April 4 is the latest end date and time.

Next, when the preparation process for the additional product E is completed, an actual Overload process is performed.

FIG. 22 is a diagram showing the allocation state of the products A to D and the product E
It is a figure showing a possible range 11ae of the allocation state of FIG. When the unit for scheduling is expressed as JOB, each J
The search range of the OB allocation is JOB19 in the additional product E.
Is from 8:00 on April 1 to 10:00 on April 3, JOB20
Is from 1:30 on April 1 to 13:00 on April 3, JOB2
1 is from 13:00 on April 1 to 10:30 on April 4, JOB
22 is from 10:30 on April 2 to 18:00 on April 4.

FIG. 23 shows products A, B, and
Each additional J for each JOB1-18 of C and D
It is a figure showing schedule result 12 after load adjustment which allocated OB19-22.

Each job of assigned products A, B, C, D
When each of the jobs 19 to 22 of the additional product E is to be assigned to the job Nos. 1 to 18, the job 19 will be described with reference to FIG.
As shown, it can be understood that there is no free load in the allocation search range. In this case, Overload in step S6
By the process, the time frame of the allocated virtual load of the processing equipment 101 shown in FIG. 23 is searched from the earliest position of the allocation search range of the job 19, and if the load of the job 19 falls within the virtual load, the virtual load is reduced. By discarding the job and assigning the job 19 to its earliest position, the subsequent jobs 20, 20
1 can be allocated within the allocation search range.

Also, JOB22 of the product E is JOB19.
Same as above, because there is no free load in the allocation search range, April 2
The virtual load assigned from 16:00 to 18:00 on the day is discarded, and the time frame of JOB 22 can be allocated from 10:30 on April 2 to 18:00 on April 2.

The schedule result (after overload adjustment) 12 shown in FIG. 23 obtained in this way is stored and held in a file of a disk device, for example.

It is also possible to output the schedule result (after overload adjustment) 12 by using a CRT device, a printer device or the like to provide information.

As described above, in a state where a time frame of a plurality of virtual loads distributed over the production period is allocated to each processing equipment, a time frame of each processing step (JOB) of each product is allocated. Therefore, when allocating each time frame of each processing step of the product of the additional order, even if an overlapping time frame occurs, by replacing the virtual load time frame with the time frame of this processing step, This overlapping state overload state) can be easily eliminated.

[0067]

As described above, in the production planning method of the present invention, the change date and time when each processing facility is changed during the production period is stored. Therefore, when allocating the time frame of each manufacturing process for manufacturing each product within the production period, it is automatically allocated to the correct processing equipment at that time, and it is possible to draft a production plan for each product efficiently and accurately. .

Further, since a plurality of virtual load time frames distributed over the production period are allocated to all or a part of the processing equipment, the load of each processing equipment can be distributed during the production period. Even if an order for an additional product is generated, the process of the additional product can be easily assigned to each processing facility with almost no change in the process of the already assigned product.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an execution order of each step of a production planning method according to an embodiment of the present invention.

FIG. 2 is a diagram showing the contents of virtual load information used in the production planning method;

FIG. 3 is a diagram showing the contents of a virtual load development result obtained by expanding virtual load information in the production planning method.

FIG. 4 is a diagram showing the contents of item-specific production instruction information of each product to be subjected to production planning adopted in the production planning method;

FIG. 5 is a diagram showing contents of item-specific process information of each product for which a production plan is to be prepared in the production plan preparation method.

FIG. 6 is a diagram showing the contents of the process development result of each product for which a production plan is to be created in the production plan formulation method.

FIG. 7 is a diagram showing contents of a process development result of each product for which a production plan is to be prepared in the same production plan preparation method.

FIG. 8 is a diagram showing the contents of processing equipment information indicating an operation pattern of each processing equipment used in the production planning method.

FIG. 9 is a diagram showing specific contents of each operation pattern of each processing equipment used in the production plan formulation method.

FIG. 10 is a view showing the contents of a PERT calculated by the production planning method.

FIG. 11 is a diagram showing the P of product D calculated by the production planning method.
Diagram showing contents of ERT calculation result

FIG. 12 is a diagram showing contents of a search range of each job in the product D calculated by the production planning method.

FIG. 13 shows P of product D calculated by the production planning method.
The figure which shows the content of the correction result of ERT calculation

FIG. 14 is a diagram showing contents of a virtual load arrangement obtained by the production planning method.

FIG. 15 is a view showing contents of arrangement of products A to C obtained by the production planning method.

FIG. 16 is a view showing contents of arrangement of a product D obtained by the production planning method.

FIG. 17 is a diagram showing the contents of item-specific production instruction information and item-specific process information of a product E newly added in the production planning method.

FIG. 18 is a diagram showing the contents of a process development result of a product E newly added in the production planning method.

FIG. 19 is a diagram showing the contents of a PERT of a product E newly added in the production plan formulation method.

FIG. 20 is a diagram showing the contents of a PERT calculation result of a product E newly added in the production planning method.

FIG. 21 is a diagram showing contents of an allocation search range of a product E newly added in the production plan making method.

FIG. 22 is a diagram showing an allocation result of products A to D calculated in the production planning method and contents of an allocatable range of newly added manufacturing E;

FIG. 23 is a diagram showing the contents of an adjusted arrangement of a product E newly added in the production planning method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Input means 2 ... Virtual load information 3 ... Virtual load development result 4, 4e ... Production instruction information by item 5, 5e ... Process information by item 6, 6e ... Process development result 7 ... Processing equipment information 8 ... Operating pattern information 9 ... time calculation results 9a, 9ae ... PERT chart 9b, 9be ... product PERT calculation results 9c, 9ce ... product JOB search range 9d ... product PERT calculation correction results 10 ... virtual load arrangement results 11 ... schedule results (overtime) Before load adjustment) 11a, 11ae ... Product arrangement 12 ... Schedule result (after overload adjustment) S1 ... Virtual load expansion processing S2 ... Process expansion result creation processing S3 ... Time calculation processing by PERT S4 ... Virtual load allocation processing S5 ... Forward Landslide allocation processing by S6 ... Overload processing

Claims (3)

[Claims] In a production planning method for assigning a time frame of each processing step to each processing equipment in a plurality of products each having a plurality of processing steps and produced using a plurality of types of processing equipment, For each processing step, store the change date and time when the processing equipment used for the relevant processing step is changed during the production period of the relevant product.If the time frame of the relevant processing is allocated to each processing equipment, A production planning method, wherein a processing facility to be assigned is determined based on which side of the change date and time the attached date and time belongs. 2. A time frame of a plurality of virtual loads distributed over a production period is assigned to the whole or a part of the processing equipment, and the time frame of the plurality of virtual loads is assigned to each processing equipment. 2. The production planning method according to claim 1, wherein a time frame of each processing step in the plurality of products is allocated at a time excluding the allocated time. 3. When a time frame overlaps when a time frame of a product is assigned to a time excluding a time to which the time frame of the virtual load is assigned, the time frame where the overlap occurs and its vicinity. 3. The production planning method according to claim 2, wherein the time frame of the virtual load is deleted, and the time frame of the processing step of the duplicate product is allocated to a time including the deleted time frame.