JP2510774B2 - Production planning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a method for production planning of a product.

[Prior Art] Conventionally, as a method of this kind, JP-A-63-28665 and
There is JP-A-1-109469.

In the former Japanese Patent Laid-Open No. 63-28665, the bottleneck process is determined from the lead time of each process in the production line, and the order of injection and the time of injection are determined so that the process can fully operate. The latter Japanese Patent Laid-Open No. 1-109469
When the job is assigned to the machine, the selection of the job and the machine is separated, the number of combinations to be processed is reduced, and the calculation time can be shortened.

[Problems to be Solved by the Invention] However, the former conventional example cannot be applied when a large number of products such as a shop floor and a large number of products are allocated to a machine in a series of lines. In the latter conventional example, the problem to be solved is the same, but there is uncertainty at the time of allocating the plan because the constraint condition is not judged before allocation.

In particular, a production plan for a high-mix low-volume factory requires a lot of knowledge and a lot of man-hours, so even if it is automated using a computer, the processing time will be extremely long due to the large number of combinations of production plans. There is a problem.

The present invention relates to a production plan creation method for reducing the processing time by creating an algorithm for production plan creation that can be processed at high speed.

[Means for solving the problem]

In order to achieve the above object, the present invention preliminarily stores in a memory a production plan reservation table in which the producible time indicated by the number of unit hours based on the production capacity of equipment per unit time is described in correspondence with the delivery date. Corresponds to the setting process and the input process of inputting the data of continuous required production time and delivery date for the product number when allocating the product of the specified product number at the facility, and the input delivery date of the product If the producible time of the production reservation table of the production plan reservation table is equal to or longer than the continuous required production time required for production of the product, the product becomes available from the producible time of each production plan reservation table after the delivery date of the product. The production time of the production plan reservation table one before the delivery date of the product and the production plan reservation table of the delivery date If it is not equal by comparing with the time, the value obtained by subtracting 1 unit time from the above required production time is taken as the required production time, and this required production time is subtracted from the producible time in the production planning reservation table immediately before the delivery date of the product. , If the producible time of the production plan reservation table immediately before the delivery date of the product is equal to the producible time of the production plan reservation table of the delivery date, then the required production time of the product is left unchanged, The values before and after the producible time in the production plan reservation table set during the period from the start of production of the product are sequentially compared, and if they are not equal, the value obtained by subtracting 1 unit time from the required production time of the product is concerned. Required production time, and subtracting the required production time from the producible time of the preceding production plan reservation table to obtain the producible time of the production plan reservation table. Processing performed assignment of the product, characterized in that it consists of a process of registering to the production plan reservation table.

[Action]

Thus, according to the present invention, since the value of the producible time of the production plan reservation table is changed and registered by performing the above-described arithmetic processing, after once allocating the production plan of the product of the predetermined product number, When allocating products of other product numbers, it is not necessary to reallocate products such as movement, so the number of combinations at the time of equipment allocation can be reduced.

[Examples] The present invention will be described below with reference to Examples.

FIG. 1 shows a system which operates the method of the present invention. Basically, an input device 1 for inputting data, an arithmetic processing device 2 for performing arithmetic processing and registration processing for a production plan reservation table, and a production plan reservation. It is composed of a memory 3 for writing a table.

 Next, the method of the present invention will be described based on actual examples.

First, in order to make a production plan reservation, a delivery date is shown in advance from the input device 1 based on the production capacity of the equipment per unit time (one day is set as one unit time in the embodiment) in the step of the flowchart shown in FIG. The date and the delivery date are entered as the number of production hours of the equipment (unit hours, expressed in number of days in the embodiment), and based on this input, the number of production hours by the processing of the arithmetic processing unit 2 A production plan reservation table corresponding to the delivery date is set in the memory 3.

FIG. 3 (a) shows an example of the set production plan reservation table. The upper row shows the date of delivery and the lower row shows the number of days that can be produced as described above. For example, if the delivery date is April 4, The number of possible days is "4". This means that by April 4, there will be four days left for this facility to produce four days. In other words, it will be one day for April 1 and 10 days for April 10.

Now, after setting the production plan reservation table in memory 3,
In the step of FIG. 2, after inputting the data of the product of the product number desired to be produced by the equipment from the input device 1, in the step after the judgment process of the presence or absence of the data in the step,
The required number of production hours (indicated by the number of unit hours, which is the required number of production days in the embodiment; hereinafter referred to as the required number of production days) and the delivery date are taken in.

When this acquisition is completed, the arithmetic processing unit 2 performs the following arithmetic processing. For example, when making a reservation for a product with a product number of which the required number of consecutive production days is 3 days and the delivery date is April 6th, the arithmetic processing unit 2 writes in the production plan reservation table of April 6th which is already set in step. Refer to the value of available production days A = "6", and set this production plan reservation table value "6"
And the required production days for the product B = "3", A ≥ B
In that case, the production of the product is reserved in the facility.

In this step, reservation registration of the product is performed in the production plan reservation table. At this time, the following arithmetic processing is performed.

That is, after the delivery date of the product, in FIG. 3 (a), the required number of production days of the product is subtracted from each production plan reservation table value after April 6th. Next, 1 from the delivery date of the product
The production plan reservation table value "5" of the day before (April 5 in Fig. 3 (a)) and the production plan reservation table value of the delivery date "6" are compared, and if they are not equal, the required number of production days becomes the unit time. The value "2" obtained by subtracting "1" is set as the required number of production days, and the required number of production days "2" is subtracted from the production plan reservation table value "5" immediately before the delivery date of the product. Furthermore, the value “5” of producible days in the production plan reservation table on April 5 before this deduction and the value “4” of producible days in the production plan reservation table on April 4 are compared and made equal. Otherwise, as in the above case, the unit time "1" is subtracted from the required production days of the product (in this case, it has changed to "2"), and this subtracted value "1"
Is set as a new required production day, and this required production day “1” is set to 4
Subtract from the value "4" for the number of days that can be produced in the table of the production planning reservation table on the 4th of a month, and change the value "4" for the number of days that can be produced in the table of the production planning reservation table on the 4th of April to "3" .

Further, the above arithmetic processing is similarly performed between April 4 and April 3 corresponding to the start of production of the product. In this case, the required number of production days is “0”, so the value of the number of days that can be produced in the table of the production plan reservation table up to April 1, which is the first day of the production plan reservation table, is shown in FIG. 3 (a). It remains the same value.

Based on the result of the arithmetic processing as described above, the production plan reservation table is changed as shown in FIG. 3B to register the production allocation of the product of the product number a. The content of the production plan reservation table shows that three days out of the six days until April 6 are reserved. In other words, it means that there will be 3 days left by April 6th.

Next, if the same equipment is used and the required production days are 2 days and the production allocation of the product with the b product number on April 6th is made, the data input consisting of the required production days and the delivery date of the product must be entered as described above. In the same manner, the same arithmetic processing as the production allocation of the product of the product number a is performed, and the production plan reservation table as shown in FIG. 3C is changed.

Thereafter, the production reservation can be allocated until the time when the production can be performed by the same processing is exhausted or the product number to be produced is exhausted, and when the data input is eliminated, the processing flowchart shown in FIG. 2 is ended (step).

Incidentally, FIG. 3 (d) shows a production plan reservation table in the case where the production reservation is allocated for the product with the required production number "1" and the delivery date is April 6, and the product number c is shown in FIG. 3 (e). ) Shows the production plan reservation table when the production reservation is allocated for the product of d product number of which the required number of production days is "4" and the delivery date is April 10.

By the way, from the state shown in FIG. 3 (d), if the product is allocated on April 9 with a delivery date of 5 days and a required production day of 5 days, the value of the number of producible days on April 9 is "3. "Therefore, this facility has a production capacity of 3 days before April 9th. Therefore, it will be impossible to produce 5 days by April 9. In other words, this product cannot be assigned.

As described above, according to the method of the present invention, the date (corresponding to the delivery date) in the production plan reservation table, the number of production days of the equipment, the delivery date of the production plan product, and the required production days are used to calculate the number of production days until the delivery date. The required number of production days is subtracted and the value is allocated until it reaches 0. By the algorithm shown in Fig. 2, the product numbers that can be produced by the equipment are determined, and then the production order is determined to make the final production. Establish the plan. At this time, the order in which a certain product is applied to the algorithm is determined by a priority number such as a product number to be preferentially allocated, a product number to be secured for production first, and a product number with few candidate facilities.

〔The invention's effect〕

According to the present invention, a process of presetting a production plan reservation table on the memory in which the producible time indicated by the number of unit hours based on the production capacity of equipment per unit time is described in correspondence with a delivery date, and a predetermined product number. An input process of inputting data of continuous required production time and delivery date in the product number when allocating the product in the facility, and a production reservation table of the production plan reservation table corresponding to the input delivery date of the product If the available production time of the product is equal to or greater than the continuous required production time required to produce the product, the required production time of the product is subtracted from the production available time of each production plan reservation table after the delivery date of the product, and Compare the producible time of the production plan reservation table one before the delivery date of the product with the producible time of the production plan reservation table of the delivery date and make them equal. For example, the value obtained by subtracting one unit time from the above required production time is taken as the required production time, which is subtracted from the producible time of the production planning reservation table one before the delivery date of the product of this required production time, and one from the delivery date of the product. If the producible time and delivery date of the previous production plan reservation table are equal to the producible time of the production plan reservation table, the required production time of the product is left unchanged, and thereafter the period from the delivery date of the product to the start of production of the product. The values before and after the producible time in the production plan reservation table set in step 1 are sequentially compared, and if they are not equal, the value obtained by subtracting one unit time from the required production time of the product is set as the required production time of the product, and the required production The time is subtracted from the producible time of the previous production planning reservation table to obtain the producible time of the production planning reservation table, and the calculation processing is performed to allocate the product. Since it consists of the process of registering the production plan reservation table with the allocation, once the production plan of the product of the predetermined product number is allocated, it is not necessary to reallocate it when allocating the product of another product number. It is possible to obtain an algorithm for creating a production plan that enables high-speed allocation processing, and as a result, even in the case of high-mix, low-volume production, it is possible to reduce the number of combinations at the time of equipment allocation, and to allocate production plans easily and quickly. It has a good effect.

[Brief description of drawings]

FIG. 1 is a block diagram of a system using the method of the present invention, FIG. 2 is a processing flowchart of the above, and FIGS. 3 (a) to 3 (e) are explanatory views of the production plan reservation table of the above. Reference numeral 1 is an input device, 2 is an arithmetic processing device, and 3 is a memory.

Claims (1)

(57) [Claims] 1. A process of presetting a production plan reservation table on a memory, in which a producible time indicated by the number of unit hours based on the production capacity of equipment per unit time is described in correspondence with a delivery date, and a predetermined product number. Process of inputting data of continuous required production time and delivery date for the product number when allocating the product of the product at the equipment, and production reservation of the production plan reservation table corresponding to the input delivery date of the product If the producible time of the table is equal to or longer than the continuous required production time required for producing the product, the required production time of the product is subtracted from the producible time of each production plan reservation table after the delivery date of the product, and Compare the producible time of the production planning reservation table one before the delivery date of the product with the producible time of the production planning reservation table of the delivery date and make them equal. If this is the case, the value obtained by subtracting one unit time from the above required production time is taken as the required production time, and this required production time is subtracted from the producible time in the production planning reservation table, which is one before the delivery date of the product, and is subtracted by If the producible time of the previous production plan reservation table and the producible time of the production plan reservation table of the delivery date are the same, the required production time of the product is left as it is, and thereafter, from the delivery date of the product to the start of production of the product. The values before and after the producible time of the production plan reservation table set for the period are sequentially compared, and if they are not equal, the value obtained by subtracting one unit time from the required production time of the product is set as the required production time of the product, and The production time is subtracted from the producible time of the preceding production plan reservation table to obtain the producible time of the production plan reservation table Production planning method characterized by comprising a process of a registered in the production plan reservation table with Ri.