JPH11120239A - Method and system for production planning and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the production planning method which can speedily generate an ordering plan and a manufacture plan corresponding to changes of orders, the production planning system which is used for its implementation, and the device-readable recording medium where programs for them are recorded. SOLUTION: A delivery information generation part 19 generates delivery information according to the ordering plan and supply periods of respective materials and updates delivery information in a delivery information data base 4 into the generated delivery information. A long-period process plan correction part 25 puts unit orders assigned to a short-period Gantt chart together by orders that the unit orders belong to generate a partial manufacture plant corresponding to a long-period Gantt chart, rewrites the plant for the period corresponding to the short-period Gantt chart in a long-period Gantt chart stored in a memory 23 into the generated partial manufacture plan to correct the long-period Gantt chart, and updates a long-period Gantt chart registered in the process programming data base 3 into the long-period Gantt chart.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for ordering materials related to a plurality of orders and performing a production plan for manufacturing a product from the materials, a production planning system used for executing the production plan, and a program for recording the program. The present invention relates to a device-readable recording medium.

[0002]

2. Description of the Related Art In order-made production, in which a plurality of types of materials are ordered in accordance with orders received from a plurality of customers, and the corresponding products are manufactured from each material, the order is frequently changed. It is important to change the product manufacturing plan and quickly create a production plan corresponding to the changed order.

Conventionally, a material ordering plan has been arranged by a purchase order planning device approximately once a week, as follows, in order to secure materials for one to two months to be used for manufacturing the ordered product. We had a plan. The operator enters the order number, dimensions, material, quantity, delivery date,
Then, a plurality of new orders including information indicating production prospect or production confirmation are input. Further, the operator gives a command to the order planning apparatus, and causes the stock quantity of each material to be read from the stock quantity database in which the stock quantity of each material that changes daily is registered.

The order planning apparatus stores a long-term Gantt chart created at the time of the last order planning and in which the number of each order and the manufacturing schedule for each of a plurality of manufacturing devices are determined for one to two months. The order planning device reads the long-term Gantt chart and displays it on the display unit together with the input order.

[0005] As described later, the operator prints the short-term Gantt chart created by the manufacturing plan creation device on a manufacturing plan creation device that creates a manufacturing plan for a product for one to two weeks and displays the displayed long-term Gantt chart. Of these, the period corresponding to the short-term Gantt chart is rewritten to the short-term Gantt chart. Then, the operator adds a new order to the long-term Gantt chart and replaces the order assigned to the long-term Gantt chart using the input unit and the display unit of the order plan creation device, and the order plan creation device updates the long-term Gantt chart. I do.

[0006] The order planning device has a reference stock amount for determining whether or not a material should be ordered, a material procurement period which is a period from when the material is ordered to when it is received, and a timing of material ordering. (For example, every predetermined day) and the quantity of ordered materials (order lot size) at one time are set in advance. For example, the order lot size is determined, for example, on a quarterly basis based on the total order volume and the actual production volume for each month included in the next quarter, and the determined total monthly order volume is determined. It is determined by dividing by the total number of orders for the month.

[0007] The order planning device obtains the type and quantity of material consumed in the period of each new order allocated thereto based on the updated long-term Gantt chart. Based on the type and quantity of the material obtained and the stock amount of each material, the order planning device specifies the time when the stock amount of each material falls below the reference stock amount and procures the order amount of the material. Calculate based on the period, average consumption volume, etc., and repeatedly make the decision to order the material by the above-mentioned order quantity at the timing closest to and after the time when the stock quantity falls below the reference stock quantity. To create a material ordering plan. If the total order quantity of one or a plurality of materials less than the reference stock amount does not reach the order lot size at each order timing, the material having the highest frequency of use is ordered by the difference amount.

On the other hand, the operator prepares a one- to two-week production plan using the production plan preparation device as follows in order to produce the ordered product. The operator gives a command to the manufacturing plan creation device, and every time a fixed order is added or changed (almost every day), a fixed order database in which the fixed orders after addition / change are stored, and actual information of a plurality of manufacturing devices are registered. Necessary information is read from the actual information database and the inventory database described above. A short-term Gantt chart showing a production plan of a product for one to two weeks is stored in the production plan creation device, and the production plan creation device gives the short-term Gantt chart to the display unit together with the confirmed order and displays it there. Let it.

The operator causes the order planning device to print the order plan created by the order planning device and, based on the order plan and the procurement period of each material, the delivery date, delivery amount, and type of material to be ordered. And the like, and input it to the production plan creation device. The operator assigns firm data to the displayed short-term Gantt chart or firms assigned to the short-term Gantt chart based on the delivery date and quantity of each firm order, the balance for assigning firm orders to manufacturing equipment, and the lead time. Change the order. The manufacturing plan creation device updates the stored short-term Gantt chart to the short-term Gantt chart after addition / change.

[0010]

However, in the conventional apparatus, the long-term Gantt chart must be rewritten by the order planning apparatus using the short-term Gantt chart printed by the manufacturing plan creating apparatus. There is a problem that rewriting takes a long time. In addition, since the long-term Gantt chart is rewritten and a new order is added to it, the operator changes the portion of the long-term Gantt chart that corresponds to the short-term Gantt chart, and the short-term Gantt chart is accurately displayed. In some cases, it was not reflected.

Further, in the manufacturing plan creation device, since the operator must create delivery information based on the long-term Gantt chart and input it to the manufacturing plan creation device, it is necessary to prepare and input the delivery information. As described above, it takes a long time to create a long-term Gantt chart, and as described above, there has been a problem that a short-term Gantt chart cannot be quickly created in response to an order change. Further, if the short-term Gantt chart is not accurately reflected on the long-term Gantt chart, the delivery information of the material becomes inaccurate, and there is a problem that the short-term Gantt chart corresponding to the order change cannot be accurately created.

The present invention has been made in view of such circumstances, and a purpose thereof is to read a first manufacturing plan used for creating an ordering plan from a first database and to read a first manufacturing plan based on a second manufacturing plan. By modifying the production plan and updating the first production plan registered in the first database to the modified first production plan, a production plan capable of quickly creating an order plan corresponding to an order change. It is an object of the present invention to provide a method, a production planning system for use in the method, and a device-readable recording medium on which the program is recorded.

Another object is to change the ordering plan by generating delivery information related to the delivery of ordered materials based on the ordering plan created using the first manufacturing plan. It is an object of the present invention to provide a production planning method capable of quickly creating a second production plan corresponding to the above, a production planning system used to execute the production planning method, and a device-readable recording medium on which the program is recorded.

[0014]

According to a first aspect of the present invention, a production planning method includes sequentially assigning a first time region corresponding to a plurality of orders including a plurality of unit orders to a time axis determined according to manufacturing equipment. A first production plan is created, and based on the first production plan, an order plan for ordering materials to be supplied to the manufacturing equipment is created, and a second time corresponding to each unit order included in each order is created. In the method of performing a production plan by sequentially allocating regions to the time axis and creating a second production plan, when the first production plan is registered in a first database and the order plan is created, the first production plan is created.
A first manufacturing plan is read from the database, a new first manufacturing plan is created using the read first manufacturing plan, and the first manufacturing plan registered in the first database is updated to a new first manufacturing plan. Then, when creating the manufacturing plan, the first manufacturing plan is read from the first database, the first manufacturing plan is corrected based on the second manufacturing plan, and the first manufacturing plan registered in the first database is corrected. It is characterized in that the plan is updated to the modified first production plan.

A production planning method according to a second invention is the production planning method according to the first invention, wherein delivery information relating to delivery of ordered materials is generated based on the order plan, and each time the delivery information is generated.
When the information is updated and registered in the second database and the second production plan is created, the delivery information is read from the second database.

A production planning system according to a third aspect of the present invention creates a first production plan by sequentially assigning first time regions corresponding to a plurality of orders including a plurality of unit orders to a time axis determined according to the manufacturing equipment. An order planning device that creates an order plan for ordering materials to be supplied to the manufacturing equipment based on the first manufacturing plan; and a second time region corresponding to each unit order included in each order. A production plan system comprising: a production plan creation device that creates a second production plan by sequentially assigning the order to a time axis; and a first database that registers the first production plan. Means for reading out the first manufacturing plan from the first database, and means for updating the first manufacturing plan registered in the first database. Means for reading a first manufacturing project from the base, and means for modifying based on the first production plan to the second production planning, the registered in the first database 1
Means for updating the production plan to the modified first production plan.

The production planning system according to the fourth invention has a third
The invention is characterized in that the order plan creation device includes means for generating delivery information relating to delivery of ordered materials based on the order plan.

A production planning system according to a fifth aspect of the present invention includes
In the invention, there is provided a second database for registering the delivery information, and the order plan creation device is provided with means for updating the delivery information registered in the second database each time delivery information is generated, and Is characterized by comprising means for reading out the delivery information from the second database when creating the second production plan.

According to a sixth aspect of the present invention, in the recording medium, a first time area corresponding to a plurality of orders including a plurality of unit orders is sequentially allocated to a time axis determined according to a manufacturing device.
A second time area corresponding to each unit order included in the order is sequentially assigned to the time axis by using an ordering plan created based on a manufacturing plan and ordering materials to be supplied to the manufacturing equipment. Means for reading a first production plan from a first database in which the first production plan is registered, on a device-readable recording medium on which a program for creating a second production plan is recorded; (2) A program including means for correcting the read first manufacturing plan based on the manufacturing plan, and means for updating the first manufacturing plan registered in the first database to the corrected first manufacturing plan. Is recorded.

A recording medium according to a seventh aspect of the present invention is the recording medium according to the sixth aspect, wherein the delivery information is read from a second database in which the delivery information relating to the delivery of the ordered material is registered and generated based on the ordering plan. A program including means is recorded.

According to the recording medium of the eighth aspect, the first time area corresponding to a plurality of orders including a plurality of unit orders is sequentially assigned to a time axis determined according to the manufacturing equipment, and a first time area related to a production plan is assigned. In a device-readable recording medium storing a program for creating a production plan and creating an order plan for ordering materials to be supplied to the manufacturing equipment based on the first production plan, the first production plan is Means for reading the first manufacturing plan from the registered first database, means for updating the first manufacturing plan registered in the first database to a newly created first manufacturing plan, A means for generating delivery information related to the delivery of ordered materials based on an ordering plan, and a method for updating and registering the delivery information in a second database for registering delivery information each time the delivery information is generated. Wherein the program including the door has been recorded.

A plurality of orders from the customer are respectively assigned serial numbers, and a plurality of orders are generated by grouping by the dimensions and materials of the materials to be used for manufacturing the products ordered by each serial number. Each order includes a plurality of unit orders such as products. When a line number is given to this unit order, the unit order can be specified by a production number and a line number.

According to the first, third and sixth aspects of the present invention, when creating an order plan, the first time corresponding to a plurality of orders including a plurality of unit orders is set on a time axis determined according to the manufacturing equipment. A new first manufacturing plan is read by reading out the first manufacturing plan to which areas are sequentially assigned from the first database, changing the order of the read first manufacturing plan, and adding a new order to the first manufacturing plan. Is created, and the first production plan registered in the first database is updated to a new first production plan.

When a production plan is created, a second time domain corresponding to each unit order included in the order is used by using a simulated annealing method, a method using a genetic algorithm, or the like, or by an instruction of an operator. Are sequentially assigned to the above-described time axis to create a second production plan, while reading out the first production plan from the first database. A plurality of unit orders included in the second manufacturing plan are aggregated for each order to which the unit order belongs, and a part corresponding to the second manufacturing plan in the first manufacturing plan read from the first database is aggregated for each order. The first manufacturing plan is corrected by rewriting the following. Then, the first production plan registered in the first database,
Update to production plan. Thus, each time the second manufacturing plan is changed, the first manufacturing plan is corrected accordingly, and an order plan corresponding to the change in order can be quickly created.

In the second, fourth, fifth, seventh and eighth inventions, the above-mentioned ordering plan specifies the ordering date of the materials, the type and quantity of the materials to be ordered, and the like. For each type of product, the procurement period from ordering the material to delivery is added to the order date of the material, the delivery date of the material is calculated, and the quantity of the ordered material is used as the delivery quantity. Generate information. When a production plan is created, a plan for manufacturing a product from materials is created using the delivery information. As a result, the second production plan corresponding to the change in the order plan can be quickly created.

Further, every time the delivery information is generated, the delivery information registered in the second database is updated. And
When creating an order plan, the delivery information is read from the second database, and the created delivery information is used when creating the second manufacturing plan as described above. by this,
The second production plan corresponding to the change in the order plan can be created more quickly.

[0027]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a production plan creation system according to the present invention. In the drawing, reference numeral 1 denotes an order plan creation device for creating a material order plan, and 2 denotes a production plan for manufacturing a product from materials. The production plan creation devices to be executed are shown. FIGS. 2 and 3 are flowcharts showing a procedure for creating a plan of the order planning apparatus 1 shown in FIG. The CPU 10 of the order plan creation device 1 waits until an order plan creation command is input (step S1), and when the command is input, the order number, quantity, size, material, delivery date and production forecast or production confirmation or Each new order is read out from a new order database (DB) 5 in which a plurality of new orders including information indicating another are registered (step S2) and stored at a predetermined address in the memory 13. Further, the CPU 10 reads out the stock amount of each material from the stock amount database 6 in which the stock amount of each material that changes daily is updated and registered (step S3), stores it in the memory 13, and executes the long-term process planning. The creation unit 14 is started.

The long-term process plan creating section 14 displays, for each of a plurality of manufacturing devices, the order number of each order and its manufacturing schedule of 1 to 2
A long-term Gantt chart defined over a period of one month, and one or more products included in each order (unit order)
The long-term Gantt chart is read out from the process plan database 3 in which the short-term Gantt chart in which the product number and its production schedule are determined for one to two weeks is registered (step S4), and the long-term Gantt chart is stored in the memory 13 and the CRT is read. Or given to the display unit 12 such as a liquid crystal display,
Display it there.

FIG. 5 is an explanatory diagram for explaining a long-term Gantt chart. There are a plurality of orders in which order numbers such as A-1, A-2, B-1, B-2,. , As shown in FIG. 5, each order is assigned to a plurality of devices in a rectangular block corresponding to a calendar.

The long-term process plan creating section 14 reads a new order from the memory 13 according to an instruction from the input section 11 such as a keyboard and a mouse, and displays the new order on the display section 12. Then, when there is an instruction to add the new order displayed on the long-term Gantt chart from the input unit 11, the long-term process plan creation unit 14 adds the new order to the long-term Gantt chart according to the instruction, and allocates the new order to the long-term Gantt chart. If there is an order exchange instruction, the order is exchanged according to the instruction to create a long-term process plan (step S5). The long-term process plan creation unit 14 includes the input unit 11
It is determined whether or not an update command has been input from (step S
6) When it is input, the long-term Gantt chart displayed on the display unit 12 is given to the process plan database 3,
The long-term Gantt chart registered there is updated (step S7).

Further, a material amount calculating unit of the order planning device 1
In step S8, based on the added / changed long-term Gantt chart, the type and quantity of the material consumed in the period of each order assigned to the chart are obtained (step S8), and the obtained quantity is given to the stock quantity calculation unit 16. . The inventory amount calculation unit 16 is a memory
Read the stock amount of each material stored in 13
Based on the read inventory amounts and the types and quantities of the materials necessary for each order of the long-term Gantt chart, a change in the inventory amount of each material is obtained (step S9), and the obtained change is given to the order planning unit 17.

The order planning unit 17 includes a reference stock amount for determining whether or not a material should be ordered, a material procurement period which is a period from when the material is ordered to when it is received, and a material ordering time. The timing (for example, every predetermined day) and the quantity of materials to be ordered at one time (order lot size) are set in advance. For example, the order lot size is determined, for example, on a quarterly basis based on the total order volume and the actual production volume for each month included in the next quarter, and the determined total monthly order volume is determined. It is determined by dividing by the total number of orders for the month.

Then, the order planning unit 17 specifies the time when the stock amount of each material falls below the reference stock amount,
The order quantity of the material is calculated based on the procurement period and the average consumption quantity, etc., and the order quantity of the material is ordered at the order timing closest to and after the time when the stock quantity falls below the reference stock quantity. By repeatedly making a decision to do so, a material ordering plan is created (step S10),
This is supplied to the form output unit 18 to output form output of the order plan (step S11), and at the same time, delivery information generation for generating delivery information such as the date on which the ordered material is delivered, the type of material to be delivered and the quantity thereof. Give order plan to part 19,
Generate delivery information. If the total order quantity of one or more materials below the reference inventory amount does not reach the order lot size at each order timing, the order plan creation unit 17 determines the material with the highest frequency of use by the difference amount. It is made to order.

The delivery information generating unit 19 orders the material for each type of material based on an ordering plan in which the date of ordering the material, the type of the material to be ordered and its quantity, and the procurement period of each material are determined. Add the procurement period from delivery to delivery to the order date of the material to obtain the delivery date of the material, and generate the delivery information by repeating the operation of using the quantity of the ordered material as the delivery quantity (step S12). Then, the delivery information generation unit 19 updates the delivery information of the delivery information database 4 in which the delivery information generated in the same manner as before is registered with the generated delivery information (step S13).

FIG. 4 is a flowchart showing a procedure for creating a plan by the manufacturing plan creating apparatus 2 shown in FIG. The CPU 20 of the manufacturing plan creation device 2 waits until a short-term Gantt chart creation command is input from the input unit 21 (step S2).
1) When the command is input, the process plan database 3
Read out the short-term Gantt chart and the long-term Gantt chart from the memory (steps S22 and S23),
At the same time, the short-term Gantt chart is given to the display unit 22 and displayed there.

FIG. 6 is an explanatory diagram for explaining the short-term Gantt chart. Each of the above-mentioned orders includes a plurality of unit orders such as a plurality of products, and each unit order is given the above-mentioned order number and a line number such as 001, 002,. In the short-term Gantt chart, as shown in FIG. 6, each unit order is allocated to a plurality of devices in a rectangular block corresponding to a calendar in consideration of a setup change time.

The CPU 20 of the manufacturing plan creation device 2
The confirmed order database 7 storing the confirmed orders to which the confirmed order numbers and product numbers are attached, the results information database 8 storing the results information of a plurality of manufacturing devices, the above-mentioned inventory amount database 6, the delivery information The required information is read from the database 4 (step S24), and stored in the memory 23.

When the short-term Gantt chart is displayed on the display unit 22, the short-term process plan creation unit 24 of the manufacturing plan creation device 2
In accordance with an instruction from the input unit 21, the confirmed order is read from the memory 23 and displayed on the display unit 22. Then, when there is an instruction to add the displayed confirmed order to the short-term Gantt chart from the input unit 21, the short-term process plan creation unit 24 adds the confirmed order to the short-term Gantt chart according to the instruction,
If there is an instruction to replace the confirmed order assigned to the short-term Gantt chart, a short-term process plan is created by replacing the confirmed order in accordance with the instruction (step S25). The short-term process plan creation unit 24 determines whether an update command has been input from the input unit 21 (step S2).
6) If it is input, the short-term Gantt chart displayed on the display unit 22 is given to the process plan database 3,
The short-term Gantt chart registered therein is updated (step S27), and the short-term Gantt chart is provided to the long-term process plan correction unit 25.

The long-term process plan correction unit 25 consolidates the plurality of unit orders assigned to the short-term Gantt chart into orders to which the unit orders belong (step S28), thereby creating a partial manufacturing plan corresponding to the long-term Gantt chart. The long-term Gantt chart is corrected by rewriting the plan for the period corresponding to the short-term Gantt chart among the long-term Gantt charts generated and stored in the memory 23 to the generated partial manufacturing plan (step S29), and the process plan The long-term Gantt chart registered in the database 3 is updated to the corrected long-term Gantt chart (step S30).

FIG. 7 is an explanatory diagram for explaining the long-term Gantt chart after correction. In the short-term Gantt chart shown in FIG. 6, the unit orders having the same order number among the unit orders with line numbers are aggregated into one block, and the operation of assigning the order number to the block is repeated. Generate a partial production plan. When the part corresponding to the short-term Gantt chart in the long-term Gantt chart shown in FIG. 5 is rewritten in the partial production plan, and the other parts are moved forward or backward, the correction as shown in FIG. A long-term Gantt chart can be obtained.

In the present embodiment, the order planning device and the manufacturing plan generating device are configured to prepare a long-term process plan and a short-term process plan according to an instruction of an operator. However, the present invention is not limited to this. , Simulated
The long-term process plan and the short-term process plan may be created using an annealing method or a method using a genetic algorithm. As a result, the time required to create the long-term process plan and the short-term process plan can be further reduced.

The computer program for the production plan as described above is written in the ROMs of the order plan creation device 1 and the production plan creation device 2 shown in FIG. A recording medium RM such as a compact disk is recorded on the disk drive, and the recording medium RM is loaded into a disk drive of the order planning device 1 and the manufacturing plan generating device 2 and loaded to execute a production plan. Is also good.

[0043]

As described in detail above, the first, third and sixth embodiments
According to the present invention, the first production plan can be shared between the order plan creation device and the production plan creation device via the first database in which the first production plan (long-term process plan) is registered. it can. Further, each time the second manufacturing plan (short-term process plan) is changed, the first manufacturing plan is corrected accordingly, and an order plan corresponding to the change in order can be quickly created.

In the second, fourth, fifth, seventh and eighth inventions, every time the first process plan is changed, an order is placed to generate delivery information such as the delivery date and delivery quantity of the material. The second production plan corresponding to the plan change can be quickly created. When creating an order plan, delivery information can be read from the second database and a second production plan can be created using the delivery information, and the delivery information registered in the second database generates delivery information. Since the present invention is updated each time, the second manufacturing plan corresponding to the change of the ordering plan can be created more quickly.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a production plan creation system according to the present invention.

FIG. 2 is a flowchart illustrating a plan creation procedure of the order plan creation device illustrated in FIG. 1;

FIG. 3 is a flowchart showing a plan creation procedure of the order plan creation apparatus shown in FIG. 1;

FIG. 4 is a flowchart showing a plan creation procedure of the manufacturing plan creation device shown in FIG. 1;

FIG. 5 is an explanatory diagram illustrating a long-term Gantt chart.

FIG. 6 is an explanatory diagram illustrating a short-term Gantt chart.

FIG. 7 is an explanatory diagram illustrating a corrected long-term Gantt chart.

FIG. 8 is a schematic diagram showing another embodiment.

FIG. 9 is a schematic diagram showing another embodiment.

[Explanation of symbols]

 Reference Signs List 1 Order plan making device 2 Manufacturing plan making device 3 Process plan database 4 Delivery information database

Claims (8)

[Claims] 1. A first manufacturing plan is created by sequentially assigning first time regions corresponding to a plurality of orders including a plurality of unit orders to a time axis determined according to manufacturing equipment, and the first manufacturing plan is created. On the basis of this, an order plan for ordering the material to be supplied to the manufacturing equipment is created, and a second time area corresponding to each unit order included in each order is sequentially assigned to the time axis to create a second manufacturing plan. In the method of performing a production plan by creating the first production plan, the first production plan is registered in a first database, and when the order plan is created, the first production plan is read from the first database, and the read first production plan is read. When a new first manufacturing plan is created using the first manufacturing plan registered in the first database and updated to a new first manufacturing plan, the first manufacturing plan is created. The first production plan is read from the database, and the first production plan is
A production planning method, wherein the production planning method is modified based on the production plan, and the first production plan registered in the first database is updated to the modified first production plan. 2. Generating delivery information relating to the delivery of ordered materials based on the ordering plan, updating and registering the delivery information in a second database each time the delivery information is generated, and creating a second manufacturing plan. 2. The production planning method according to claim 1, wherein delivery information is read from said second database. 3. A first manufacturing plan is created by sequentially assigning first time regions corresponding to a plurality of orders including a plurality of unit orders to a time axis determined according to the manufacturing equipment, and the first manufacturing plan is created. An order plan creating apparatus for creating an order plan for ordering materials to be supplied to the manufacturing equipment, and a second time area corresponding to each unit order included in each order is sequentially assigned to the time axis to form a second order area. A production plan system comprising: a production plan creation device for creating a production plan; and a first database for registering the first production plan, wherein the order plan creation device reads the first production plan from the first database. And means for updating the first production plan registered in the first database, wherein the production plan creation device reads the first production plan from the first database. Means for correcting the first manufacturing plan based on the second manufacturing plan, and means for updating the first manufacturing plan registered in the first database to the corrected first manufacturing plan. A production planning system, characterized in that: 4. The production planning system according to claim 3, wherein said order planning device includes means for generating delivery information relating to the delivery of ordered materials based on said order plan. 5. A production plan, comprising: a second database for registering the delivery information; wherein the order planning device includes means for updating the delivery information registered in the second database each time the delivery information is generated; 5. The production planning system according to claim 4, wherein the creation device includes means for reading out delivery information from the second database when creating the second production plan. 6. The manufacturing device is created based on a first manufacturing plan in which first time regions corresponding to a plurality of orders including a plurality of unit orders are sequentially allocated to a time axis determined according to the manufacturing device. A program for creating a second production plan of a production plan by sequentially assigning a second time area corresponding to each unit order included in the order to the time axis using an order plan for ordering materials to be supplied to the order. Means for reading the first manufacturing plan from a first database in which the first manufacturing plan is registered, wherein the first manufacturing plan is read based on the second manufacturing plan. A program is recorded which includes means for modifying the first production plan, and means for updating the first production plan registered in the first database to the modified first production plan. Device-readable recording medium characterized and. 7. A program recorded on the basis of the order plan and including a means for reading delivery information from a second database in which delivery information relating to delivery of ordered materials is registered. A recording medium readable by the device described in the above. 8. A first time area corresponding to a plurality of orders including a plurality of unit orders is sequentially assigned to a time axis determined according to a manufacturing device, and a first manufacturing plan according to a production plan is created. A first database in which the first manufacturing plan is registered, on a device-readable recording medium storing a program for creating an order plan for ordering materials to be supplied to the manufacturing equipment based on the first manufacturing plan. Means for reading out a first production plan from a first production plan, means for updating the first production plan registered in the first database to a newly created first production plan, and order placement based on the ordering plan. A program that includes means for generating delivery information related to delivery of materials that have been provided, and means for updating and registering the delivery information in a second database for registering delivery information each time the delivery information is generated. Device-readable recording medium characterized that you have.