JP2006018576A - Production schedule planning program and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production schedule planning method capable of accurately planning a production schedule even in the case of being applied to a production process of producing products by a cell production system. <P>SOLUTION: The step (S4) of planning a partial production schedule for producing a part of an ordered quantity on the basis of production ability information indicating ability to produce the products and an updating step (S5) of predicting the change of production ability generated when the planned partial production schedule is executed and updating the production ability information are repeated until the all of the ordered quantity is allocated to the production schedule (S7:Yes). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a production plan in a production process of a cell production system, and more particularly to a technique for creating a production plan with high accuracy.

Conventionally, in the production process of producing products by the line production method, the production capacity such as the quantity that production equipment such as processing equipment can produce products per unit time, or the time required for the production equipment to produce the number of products The number of working hours necessary to produce the ordered quantity of products is calculated based on the production capacity, and a production plan is made (for example, Patent Document 1).
By the way, in recent years, the cell production method is being adopted in the field of product production. For example, products are produced by the cell production method in assembly factories such as LCD (Liquid Crystal Display) and PDP (Plasma Display Panel).
JP-A-4-82660

However, in the production process using the cell production method, the worker may become familiar with the work while producing the product, and the production capacity in the process may be improved and the production may proceed quickly.
As a result, when applying a production plan prepared by the conventional production plan planning method to the production process of the cell production method, the production plan is frequently used in order to correct the difference between the production plan and the actual production results. There is a problem that it is necessary to re-plan. Frequent re-planning of production plans is not only time consuming, but also causes problems in production sites.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a production plan planning program and method capable of planning a production plan with high accuracy when applied to a production process of a cell production method.

  In order to achieve the above object, the production planning program according to the present invention is a production planning program for causing a computer to produce a production plan in a production process in which the ability to produce a product changes due to the production of the product. The order reading step for reading the order information indicating the quantity of the product to be produced from the file storing the order information, the production capacity information indicating the ability to produce the product, and the production capacity information are stored. This occurs when the production capacity reading step for reading from the existing file, the planning step for creating a partial production plan for producing a unit quantity of product based on the production capacity information, and the planned partial production plan are executed. An update step for predicting a change in production capacity and updating production capacity information based on the prediction; Causing the computer to execute a control step that repeats the planning step and the updating step until the quantity of the product that has been assigned by the partial production plan that has already been planned satisfies the quantity indicated by the order information. It is a feature.

  Further, the production planning method according to the present invention includes a production plan for a production process in which the ability to produce a product changes due to production of the product, an order file storing order information indicating the quantity of products to be produced, A production planning method for planning in a production planning device having a production capacity file storing production capacity information indicating the ability to produce products, an order obtaining step for obtaining order information from the order file, and production A production capacity acquisition step for acquiring capacity information from a production capacity file, a planning step for planning a partial production plan for producing a unit quantity of product based on the production capacity information, and the prepared partial production plan. An update step that predicts a change in production capacity that occurs when executed, and updates production capacity information based on the prediction. And a control step that repeats the planning step and the updating step until the quantity of the product that has been assigned by the partial production plan that has already been planned satisfies the quantity indicated by the order information. It is said.

  The production planning program according to the present invention updates and updates production capacity information in anticipation of an improvement in production capacity that occurs when a product is produced according to a partial production plan, with the configuration described in the means for solving the problem. Since the next partial production plan is drafted based on the production capacity information, the production plan can be drafted with high accuracy even when applied to a production process for producing a product by the cell production method.

Therefore, when a product is produced in accordance with the production plan formulated by the production plan planning program according to the present invention, it is possible to suppress the occurrence of a difference between the production plan and the actual production performance, so that the start of production is delayed. The stock quantity of goods can be reduced.
The planning step includes a calculation sub-step for calculating an estimated time required to produce the unit quantity of the product based on the production capacity information, and the production of the unit quantity of the product for the calculated estimated time. An allocation sub-step that allocates to a period may be included.

This makes it possible to easily calculate the predicted time when the quantity of products that can be produced per unit time is given as the production capacity.
Therefore, it is possible to reduce the amount of data processing required for making a production plan.
Further, the planning step includes a calculation sub-step for calculating a predicted quantity that can be produced in a unit period based on the production capacity information, and an allocation sub-step for assigning the production of the product of the calculated predicted quantity to the unit period. May be included.

As a result, when the time required for producing one product is given as the production capacity, the predicted quantity can be easily calculated.
Therefore, it is possible to reduce the amount of data processing required for making a production plan.
The production plan indicates the quantity of products to be produced in a predetermined period, and the update step performs the production for the quantity already assigned to the partial production plan based on a function indicating the relationship between the quantity of products and the production capacity. The capacity may be obtained, and the production capacity information may be updated with the production capacity.

Thus, when the relationship between the quantity of products produced by the worker and the improvement in production capacity can be approximated by the model formula, a production plan can be made with high accuracy.
The production of the product is performed by replacing workers engaged in each unit period, and the production capacity file includes shift information indicating which worker is engaged in each unit period, and each worker. Corresponding production capacity information is stored, and the production capacity reading step identifies the worker engaged in a predetermined unit period based on the shift information, and the production capacity information corresponding to the identified worker. Is read from the production capacity file, and the updating step is a sub-step of obtaining a quantity allocated to the partial production plan of the unit period in which the specified worker is engaged among the partial production plans already planned And a sub-step for obtaining a production capacity for the obtained quantity based on the function, and a sub-step for updating the production capacity information with the obtained production capacity It may include the step and.

Thereby, even when a plurality of workers are engaged in production by shift work, a production plan can be made with high accuracy.
Further, the production plan indicates the quantity of products to be produced in a predetermined period, and the update step is based on a function indicating the relationship between the number of work hours and the production capacity. The production capacity with respect to the number of working hours may be obtained, and the production capacity information may be updated with the production capacity.

As a result, a production plan can be made with high precision when the relationship between the work time in which the worker is engaged in production and the improvement in production capacity can be approximated by a model formula.
The production of the product is performed by replacing workers engaged in each unit period, and the production capacity file includes shift information indicating which worker is engaged in each unit period, and each worker. Corresponding production capacity information is stored, and in the production capacity reading step, workers engaged in a predetermined unit period are identified based on the shift information, and production capacity information corresponding to the identified workers is determined. Reading from the production capacity file, and the updating step includes a sub-step for obtaining the number of working hours in a unit period in which the specified worker is engaged among unit periods in which a partial production plan has already been formulated, and the function A sub-step for obtaining a production capacity for the obtained number of working hours, and a sub-step for updating the production capacity information with the obtained production capacity. It may be.

Thereby, even when a plurality of workers are engaged in production by shift work, a production plan can be made with high accuracy.
In the control step, when the production capacity information is updated in the update step, whether or not the ability to produce the product indicated by the production capacity information changes more than a predetermined change rate before and after the update. An update determination sub-step for determining whether or not when a positive determination is made in the update determination sub-step, in the planning step, a partial production plan for producing a product of the first unit quantity is made, A planning control substep for planning a partial production plan for producing a product of a second unit quantity larger than the first unit quantity in the planning step when a negative determination is made in the update determination substep. May be included.

  As a result, a partial production plan that allocates the production of a small number of products between the time when production capacity is significantly improved, for example, from the time when workers are engaged in the production of products to the time they become proficient in work, By planning, the production capacity information is updated frequently, and when the worker is already proficient in the work and the improvement of the production capacity is gradual, by creating a partial production plan to which the production of many products is assigned, The number of updates of production capacity information can be suppressed.

Therefore, when the production capacity is remarkably improved, it is possible to reduce the amount of data processing required for making the production plan while keeping the accuracy of the production plan high.
The production planning method according to the present invention is updated by updating the production capacity in anticipation of the improvement of the production capacity that occurs when the product is produced according to the partial production plan by the configuration described in the means for solving the problems. Since the next partial production plan is drafted based on the production capacity, the production plan can be drafted with high accuracy even when applied to a production process for producing a product by the cell production method.

  Therefore, when a product is produced according to the production plan formulated by the production plan planning program according to the present invention, it is possible to suppress the occurrence of an error between the production plan and the actual production result, so that the start of production is delayed. The stock quantity of goods can be reduced.

  In the present embodiment, a production plan planning apparatus for planning a production plan in a production process in which a cell production method is introduced will be described. The production planning apparatus according to the present embodiment is a computer system including a processor, a ROM, a RAM, and a hard disk. A program recorded in the ROM is read and executed by the processor, and the program and hardware resources cooperate. To achieve that function.

Hereinafter, the production plan planning apparatus 100 according to the present embodiment will be described with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of a production plan planning apparatus according to the present invention. As shown in the figure, the production plan planning apparatus 100 includes an order information holding unit 1, a shift information holding unit 2, an operator information holding unit 3, a planning unit 4, a production plan holding unit 5, an update pattern information holding unit 6, and an updating unit. 7 and each functional block of the control unit 8.

Each functional block of the order information holding unit 1, the shift information holding unit 2, the worker information holding unit 3, the production plan holding unit 5 and the update pattern information holding unit 6 is specifically a recording area secured on the hard disk. It is.
The order information holding unit 1 holds the order information shown in FIG. The order information includes information on the product number of the ordered product, the quantity to be produced, and the delivery date.

  The shift information holding unit 2 records shift information indicating the shift of the worker in the production process for creating a production plan. FIG. 3 is a diagram showing the data structure of the shift information held in the shift information holding unit 2. In the shift information, the work period number and the ID of the worker engaged in the work period are recorded in association with each other. In the example shown in the figure, a group composed of workers with worker IDs 1, 2, and 3, a group composed of workers with worker IDs 4, 5, and 6, and worker IDs 7, 8, And a group of nine workers are shifted in three shifts every work period to produce products.

  The worker information holding unit 3 holds worker information for each worker. FIG. 4 is a diagram showing a data structure of worker information held in the worker information holding unit 3. In each worker information, a worker corresponding to the worker ID 31 is specified. In the worker information, the production capacity and the experience quantity are recorded for each product number of the product to be produced. The production capacity 33 indicates the number that the worker can produce the product indicated by the product number 32 in one work period, and the experience quantity 34 indicates the number that the worker has produced the product indicated by the product number 32 so far. In the example shown in the figure, the worker with worker ID 1 has no experience of producing any product with the product numbers 101 and 102 so far, 10 products with the product number 101 are in the work period, and the product number is 102. This means that 13 products can be produced in one work period. Note that the experience quantity 34 is information used as a guideline for work proficiency when the update unit 7 updates the production capacity 33. Here, the value indicated by the experience quantity 34 is actually produced by the operator. This includes not only the number of products that have been produced, but also the number of products that have been assigned production in an already planned production plan. As a result, even when a production plan has not yet been executed, it is possible to make a production plan for the next work period in anticipation of improvement of the operator's technology by executing the production plan.

  The planning unit 4 allocates the quantity of products to be produced for each work period and drafts a production plan for one work period (hereinafter referred to as “partial work plan”). Specifically, the planning unit 4 receives the work period number N for planning the partial production plan from the control unit 8 and acquires the IDs of all workers engaged in the Nth period from the shift information. The planning unit 4 detects worker information having the same worker ID from the worker information holding unit 3 for each acquired ID, and acquires and acquires the production capacity set in the detected worker information. The total value of the production capacity is allocated to the N-th work period, and the N-th partial production plan is registered in the production plan information of FIG.

The production plan holding unit 5 holds the production plan information shown in FIG. The production plan information is a table in which a partial production plan for each work period planned by the planning unit 4 is registered, and the work period number and the quantity of products assigned to the work period (hereinafter, “ "Planned quantity") is recorded in association with each other.
The update pattern information holding unit 6 holds update pattern information having the data structure shown in FIG. The update pattern information is a correspondence table showing the relationship between the quantity of products of the same product number produced so far and the production capacity for producing the product. The relationship between the quantity of products produced so far and the production capacity is determined based on the performance of other workers who have produced products of the same product number in the past. The production capacity increases as the quantity produced increases, and the production capacity improves.When the upper limit is approached, the pace of capacity improvement slows down. It can be approximated to a model formula using a sigmoid function.

  The updating unit 7 updates the value of the production capacity set in the worker information every time a partial production plan is drawn up by the planning unit 4. Specifically, the update unit 7 receives from the control unit 8 the work period number N for which the partial production plan is drawn up, and acquires the ID of the worker engaged in the Nth period from the shift information. Next, for each acquired ID, the update unit 7 detects worker information having the same worker ID from the worker information holding unit 3 and sets the value of the experience quantity set in the detected worker information. The corresponding next capability is acquired from the update pattern information of FIG. 6, and the value of the production capability of the worker information is updated with the value of the next capability obtained here.

  The control unit 8 causes the planning unit 4 and the updating unit 7 to repeatedly execute the planning of the partial production plan and the update of the production capacity until the quantity of the product assigned to the production plan reaches the quantity indicated by the order information. . Specifically, the control unit 8 sets each work in the production plan information held in the production plan holding unit 5 in FIG. 5 every time a partial production plan is made and the production capacity is updated for one work period. Compare the planned quantity assigned to the partial production plan for the period with the quantity indicated by the order information, and if the total planned quantity is less than the product quantity indicated in the order information, the next work period The planning unit 4 and the updating unit 7 are instructed to formulate the partial production plan and update the production capacity based on the planned partial production plan for the next work period.

This completes the description of the functional configuration of the production planning apparatus 100 realized by the cooperation between the program and hardware resources.
Subsequently, a program for realizing the above-described functional configuration will be described. The above-described program is created by describing the processing procedure shown in the flowcharts of FIGS. 7, 8, 9, and 10 in a computer description language. First, a processing procedure for controlling the production planning process in the control unit 8 will be described with reference to FIG.

First, the control unit 8 initializes a variable N indicating the work period to be processed to 1 (S1), then reads the order information from the order information holding unit 1, and acquires the product number, quantity, and delivery date of the product ( S2). Then, the loop process consisting of steps S3 to S7 is repeated for each work period.
The control unit 8 that has entered the loop processing first instructs the planning unit 4 to acquire the production capacity of the entire production process in the N-th period (S3), and then, based on the acquired production capacity, Instructs the creation of an Nth partial production plan (S4). After the partial production plan for the Nth period is drawn up, the control unit 8 instructs the update unit 7 to update the production capacity (S5), and further increases the variable N by 1 (S6). Thereafter, the control unit 8 compares the cumulative value of the planned quantity 42 of the production plan information held in the production plan holding unit 5 with the quantity 12 set in the order information acquired in step S2, and determines the planned quantity. When the accumulated value of 42 is smaller than the quantity 12 (S7: No), the process returns to step S2 and the loop processing is continued.

When the cumulative value of the planned quantity 42 has reached the quantity 12 set in the order information (S7: Yes), the control unit 8 exits the loop process consisting of steps S3 to S7 and is set in the order information. The point in time from the current delivery date 13 to the Nth period is set as the work start date of the production plan (S8). The above is the control processing procedure by the control unit 8.
Next, the processing procedure of the production capacity acquisition process by the planning unit 4 will be described with reference to FIG.

  The planning unit 4 instructed by the control unit 8 for the N-th production capacity acquisition process firstly selects all the worker IDs 22 set in the N-th period from the shift information held in the shift information holding unit 2. Obtained (S11), and subsequently, a variable A indicating the production capacity of the entire production process is initialized to 0 (S12). Then, the loop process consisting of steps S13 to S16 is repeated with each worker ID acquired in step S11 as a processing target.

  In the loop process, the planning unit 4 first selects from the worker information held in the worker information holding unit 3 that the worker ID 31 matches the worker ID to be processed, and orders from the selected worker information. The production capacity 33 for the product of the product number indicated by the information is read (S13). Subsequently, the planning unit 4 adds the read value a of the production capacity 33 to the variable A (S14). Further, the planning unit 4 calculates the quantity of products produced by the worker identified by the worker ID to be processed in the N-th period from the value a, and experiences related to the products from which the production capacity 33 is read in step S13. The calculated value is added to the quantity 34 (S15). However, in this embodiment, since the quantity of products that can be produced in one work period is used as the production capacity, the value a read from the production capacity 33 may be added to the experience quantity 34 as it is.

When the processes in steps S13, S14, and S15 are completed for all worker IDs acquired in step S11 (S16: Yes), the planning unit 4 ends the N-th period production capacity acquisition process. The above is the processing procedure of the production capacity acquisition processing by the planning unit 4.
Next, the procedure of the partial production plan planning process by the planning unit 4 will be described with reference to FIG.

  The planning unit 4 instructed by the control unit 8 to execute the partial production plan planning process in the Nth period produces the Nth period based on the value of the variable A indicating the production capacity of the entire production process calculated in the production capacity acquisition process. The quantity of products predicted to be able to be calculated is calculated (S21). Subsequently, the planning unit 4 registers the quantity calculated in step S21 as the planned quantity 42 of the Nth period in the production plan information held in the production plan holding part 5 (S22). However, in this embodiment, since the quantity of products that can be produced in one work period is used as the production capacity, the value of the variable A can be used as the planned quantity for the Nth period as it is. The above is the processing procedure of the partial production plan planning process by the planning unit 4.

Next, the processing procedure of the production capacity update process by the update unit 7 will be described with reference to FIG.
The update unit 7 instructed by the control unit 8 to update the production capacity in the Nth period, first, all the worker IDs 22 set in the Nth period from the shift information held in the shift information holding unit 2. Obtain (S31). Then, the loop process consisting of steps S32 to S35 is repeated with each worker ID acquired in step S31 as a processing target.

  In the loop processing, the update unit 7 first selects from the worker information held in the worker information holding unit 3 that the worker ID 31 matches the worker ID to be processed, and orders from the selected worker information. The experience quantity 34 for the product of the product number indicated by the information is read (S32). Subsequently, the update unit 7 acquires the next ability corresponding to the value of the experience quantity 34 read in step S32 from the update pattern information held in the update pattern information holding unit 6 (S33). Further, the updating unit 7 updates the production capacity 33 related to the product from which the experience quantity 34 is read in step S32 with the value of the next capacity acquired in step S33 (S34).

When the processes in steps S32, S33, and S34 are completed for all worker IDs acquired in step S31 (S35: Yes), the updating unit 7 ends the N-th production capacity update process. The above is the processing procedure of the production capacity update process by the update unit 7.
As described above, the production plan planning apparatus according to the present embodiment is predicted when the process of planning a partial production plan to which a part of the ordered quantity is assigned and the planned partial production plan are executed. The process of updating production capacity in anticipation of proficiency with the work to be performed is repeated until all of the ordered quantities are allocated, so a production plan is created. It is possible to make a highly accurate production plan with little trouble.

Further, since the production plan planning apparatus according to the present embodiment updates the production capacity in the process of planning the production plan, the production plan can be executed even if the already planned production plan has not been executed yet. In anticipation of the improvement in production capacity due to the above, it is possible to make a production plan for the next ordered order with high accuracy.
Although the present invention has been described based on the above embodiment, it is needless to say that the present invention is not limited to the above embodiment. The following cases are also included in the present invention.

(1) The present invention may be a production planning method disclosed by the processing procedure of the flowchart described in the above embodiment. Further, the present invention may be a program that realizes these methods by a computer, or may be a digital signal composed of the program.
The present invention also provides a computer-readable recording medium for the program or the digital signal, such as a flexible disk, hard disk, CD-ROM, MO, DVD, DVD-ROM, DVD-RAM, BD (Blu-ray Disc). It may be recorded in a semiconductor memory or the like.

In the present invention, the program or the digital signal may be transmitted via an electric communication line, a wireless or wired communication line, a network represented by the Internet, or the like.
In addition, the program or the digital signal is recorded on the recording medium and transferred, or the program or the digital signal is transferred via the network or the like, and is executed by another independent computer system. It is good.

(2) In the above embodiment, the partial production plan is drafted for each work period. However, the production plan drafting method according to the present invention does not necessarily require the partial production plan to be drafted in units of time. A partial production plan may be made for each product. Furthermore, it is not necessary to make a partial production plan for a certain period of time or every certain quantity.
For example, when it is predicted that the improvement in production capacity from the start of production of a product until it is proficient in the work will be significant, a part is calculated by calculating the number of products that can be produced over a short period of time. After planning the production plan, when the worker is already proficient in the work and the improvement of the production capacity is expected to be moderate, a partial calculation is made by calculating the number of products that can be produced over a long period of time. A production plan may be drafted. Or, when it is predicted that the improvement in production capacity from the start of production of the product until the worker becomes familiar with the work is expected to be significant, the partial production plan is calculated by calculating the time required for production for a small number of products. After that, when the worker is already proficient in the work and the improvement in production capacity is expected to be moderate, a partial production plan is planned by calculating the time required for production for many products. Also good. As a result, the total amount of data processing required for the production planning can be suppressed while keeping the accuracy of the production planning high even when it is predicted that the production capacity will be significantly improved.

  Here, it can be determined, for example, by the following procedure whether the production capacity of the predetermined worker is remarkably improved or moderate. First, when planning a partial production plan, the planning unit acquires the experience quantity set in the worker information of a predetermined worker, and acquires the next capability corresponding to the acquired value from the update pattern information. Next, the value of the next capacity acquired here is compared with the value of the production capacity set in the worker information, and if the difference is equal to or greater than a predetermined value, it is determined that the improvement of the production capacity is remarkable.

Also, there is a large difference between the value of the next capacity and the value of the production capacity set in the worker information for the time width for drafting the partial production plan at one time or the quantity of products for which the partial production plan is drafted at one time. You may take large according to the magnitude of the difference.
(3) In the above embodiment, the production capacity is indicated by the number of products that can be produced in one work period. However, the production capacity is information that can specify the relationship between the number of products to be produced and the time required for production. Information expressed in other formats may also be used. For example, as the information indicating the production capacity, the number of products that can be produced in one hour may be used, or the time required to produce one product may be used.

  Further, in the above embodiment, the information indicating the production capacity is individually managed and updated for each worker. However, the present invention is information indicating the production capacity of a plurality of workers engaged in the production of products of the same product number. May be collectively managed and updated. For example, in a production process in which workers do not produce products individually but produce one product by a plurality of people, the production capacity is managed and updated for each group engaged in the production of one product. Alternatively, the production capacity of the entire production process described above may be managed and updated with one piece of information.

  (4) In the above embodiment, when updating the production capacity, based on the cumulative value of the number of products actually produced by the worker and the number of products to which production is assigned in the production plan that has already been planned. The production capacity in the next work period is determined, but the production plan planning method according to the present invention is based on the experience that is expected to be obtained by executing the already planned partial production plan. For example, the production capacity in the next work period may be determined based on the accumulated work time.

(5) In the above embodiment, when the production capacity is updated, the production capacity in the next work period is determined based on the correspondence table between the quantity of produced products and the production capacity. It may be calculated based on a function that approximates the relationship between the quantity of the finished product and the production capacity.
(6) The above embodiment and the above modifications may be combined.

  The production planning method according to the present invention can be applied to uses such as production planning in a factory that has introduced a cell production method.

It is a block diagram which shows the function structure of the production plan planning apparatus which concerns on this invention. It is a figure which shows the data structure of order information. It is a figure which shows an example of shift information. It is a figure which shows the data structure of production capacity information. It is a figure which shows an example of production plan information. It is a figure which shows an example of update pattern information. It is a flowchart which shows the flow of a process of the production plan planning method which concerns on this invention. It is a flowchart which shows the flow of the process which acquires production capacity. It is a flowchart which shows the flow of a process of a partial production plan planning process. It is a flowchart which shows the flow of a process of a production capacity update process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Order information holding part 2 Shift information holding part 3 Worker information holding part 4 Planning part 5 Production plan holding part 6 Update pattern information holding part 7 Update part 8 Control part 100 Production plan planning apparatus

Claims (9)

A production planning program for causing a computer to create a production plan in a production process in which the ability to produce a product changes as a result of producing the product,
An order reading step for reading order information indicating the quantity of products to be produced from a file storing the order information;
A production capacity reading step for reading out production capacity information indicating the ability to produce a product from a file in which the production capacity information is stored;
A planning step for creating a partial production plan for producing a unit quantity of the product based on the production capacity information;
An update step of predicting a change in production capacity that occurs when the planned partial production plan is executed, and updating production capacity information based on the prediction;
Causing the computer to execute a control step that repeats the planning step and the updating step until the quantity of products assigned production by the partial production plan that has already been planned satisfies the quantity indicated by the order information. A characteristic production planning program. The planning step includes
A calculation sub-step for calculating an estimated time required to produce the unit quantity of the product based on the production capacity information;
The production planning program according to claim 1, further comprising an allocation sub-step for allocating the production of the unit quantity of products to a period corresponding to the calculated predicted time. The planning step includes
A calculation sub-step for calculating a predicted quantity that can be produced in a unit period based on the production capacity information;
2. The production planning program according to claim 1, further comprising an allocation sub-step for allocating the production of the calculated predicted quantity of the product to the unit period. The production plan shows the quantity of products produced in a given period,
The updating step obtains the production capacity for the quantity already allocated to the partial production plan based on a function indicating the relationship between the product quantity and the production capacity, and updates the production capacity information with the production capacity. The production planning program according to claim 1, wherein the program is a production planning program. Production of the product is made by replacing workers engaged in each unit period,
The production capacity file stores shift information indicating which worker is engaged for each unit period, and production capacity information corresponding to each worker,
The production capacity reading step identifies an operator engaged in a predetermined unit period based on the shift information, reads production capacity information corresponding to the identified worker from the production capacity file,
The updating step includes
A sub-step for obtaining a quantity allocated to the partial production plan of the unit period in which the identified worker is engaged among the partial production plans already drafted;
A sub-step of determining a production capacity for the determined quantity based on the function;
The production plan planning program according to claim 4, further comprising: a sub-step of updating the production capacity information with the obtained production capacity. The production plan shows the quantity of products produced in a given period,
The updating step obtains the production capacity with respect to the number of work hours in the period in which the partial production plan has already been made based on a function indicating the relationship between the number of work hours and the production capacity, and the production capacity information is obtained with the production capacity The production planning program according to claim 1, wherein the program is updated. Production of the product is made by replacing workers engaged in each unit period,
The production capacity file stores shift information indicating which worker is engaged for each unit period, and production capacity information corresponding to each worker,
The production capacity reading step identifies workers engaged in a predetermined unit period based on the shift information, reads production capacity information corresponding to the identified workers from the production capacity file,
The updating step includes
A sub-step for obtaining the number of working hours in a unit period in which the specified worker is engaged among unit periods in which a partial production plan has already been established;
A sub-step of determining a production capacity for the determined number of working hours based on the function;
The production plan planning program according to claim 6, further comprising: a sub-step of updating the production capacity information with the obtained production capacity. The control step includes
An update determination sub that determines whether or not the ability to produce the product indicated by the production capacity information changes more than a predetermined change rate before and after the update when updating the production capacity information in the update step. Steps,
If an affirmative determination is made in the update determination substep, the planning step causes the partial production plan to be produced to produce a first unit quantity of product, and a negative determination in the update determination substep. And a planning control sub-step for making a partial production plan for producing a product of a second unit quantity larger than the first unit quantity in the planning step. The production planning program according to 1. The production planning apparatus has an order file storing order information indicating the quantity of products to be produced, and a production capacity file storing production capacity information indicating the ability to produce products, and has the ability to produce products. A production plan planning method for planning a production plan of a production process that changes by producing the product in the production plan planning device,
Order acquisition step for acquiring order information from an order file;
A production capacity acquisition step for acquiring production capacity information from a production capacity file;
A planning step for creating a partial production plan for producing a unit quantity of the product based on the production capacity information;
An update step for predicting a change in production capacity that occurs when the planned partial production plan is executed, and updating production capacity information based on the prediction;
And a control step that repeats a planning step and an updating step until the quantity of products assigned production by a partial production plan that has already been planned satisfies the quantity indicated by the order information. Production planning method.

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