JPH0425350A - Preparation device for schedule of production process - Google Patents

Abstract

PURPOSE:To realize a preparation device for schedule of production process applicable in almost all cases for the production systems of plural lines, by properly using various objective functions and also considering a lot of constrraint conditions and plural lines. CONSTITUTION:Production request data are input. Then, various kinds of products requested for production are sorted based on the reference data at a production allocation order deciding part 23 and also theallocation order of the sorted product group is decided. All thinkable combinations of the process allocation are calculated then, based on the production request data led from the production allocation order deciding part 23 at a production process alloca tion arithmetic selection part 24. In the case of applying restraint conditions during this process allocation course, the necessary restraint conditions data are read in the production process allocation arithmetic selesction part 24. In the case of applying objective function data, the necessary objective function data are read in the production process allocation arithmetic selection part 24.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applied to a production system in which a plurality of products of different types are produced simultaneously and in parallel on a plurality of molding lines. The present invention relates to a production process planning chart creation device that can perform optimal production process allocation.

(Prior Art) Recently, with the development of computers due to advances in semiconductor technology, it has become possible to use computers to plan molding processes in plastic molding plants, which previously relied on human empirical rules. There is.

As an example of such a process planning device, for example,
There is an interactive schedule planning device disclosed in Japanese Patent No. 6-162713.

This interactive schedule planning device uses the conditions (
Input the amount of work, possible start date, delivery date), create a schedule for each job so that the amount of work is smoothed out under those conditions, and then modify the schedule according to the operator's instructions. The final itinerary is then created and this itinerary is output.

(Problem to be Solved by the Invention) However, the above-mentioned conventional device displays only the cumulative work schedule by operations mainly using the keyboard. Also,
The objective function is only to smooth the amount of work, the only constraint is the delivery date, and since the plan is for only a single line, multiple products of different types can be processed simultaneously in parallel on multiple molding lines. There was a problem that it could not be applied to the production system in which it is produced.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to improve the man-machine interface, as well as to create a production process plan creation device that takes into account the use of various objective functions and the constraints of multiple lines. It is about providing.

(Means for Solving the Problems) In order to solve the above problems, the production process plan creation device of the present invention is applicable to a production system in which a plurality of products of different types are simultaneously produced in a plurality of molding lines in parallel. , an input section for inputting production requests such as which products, how many pieces, and when to manufacture them, as well as basic data such as the manufacturing time for each product and the setup change time for each molding die on each molding line. a first storage section for storing various constraint data and various objective function data during the production process; and a second storage section for storing various constraint data and various objective function data during the production process, and classifying production requests inputted from the input section based on a certain standard. and a production allocation order determining unit that determines the production allocation order of each category, based on the basic data stored in the first storage unit and the production allocation order of each category determined by the production allocation order determining unit. Then, all combinations of production process allocations for each category are calculated, and the optimal production is calculated from among the calculated production process allocation results for each category based on the various data stored in the second storage unit. a calculation selection unit that selects a process allocation result; a process correction unit that can modify the production process allocation result selected by the calculation selection unit by an operation of an operator; A configuration including an output section that outputs the optimal production process allocation result corrected by the correction section is adopted.

(Operation) Production requests such as which product, how many pieces, and when to manufacture are input from the input section. In the production allocation order determination section,
Based on basic data stored in the first storage section, such as the manufacturing time per piece of each product and the setup change time for each mold on each molding line, the production requests input from the input section are adjusted to a certain level. In addition to classifying based on standards, the production allocation order for each classification is determined. Then, all combinations of production process allocations for each category are determined based on the basic data stored in the first storage unit and the production allocation order for each category determined by the production allocation order determining unit. Based on various constraint data and objective function data in the production process stored in the second storage unit, the calculation is performed by the calculation selection unit, and the optimal one is selected from among the calculated production process allocation results of each category. Select the production process allocation result. At this time, if necessary, the production process allocation result selected by the calculation selection unit is corrected by operating the process correction unit. Then, the optimal production process allocation result corrected in this way is output from the output unit. Here, the output unit is a monitor having a display screen, and a printer that prints on recording paper.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

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

In the figure, the production process planning sheet creation device of the present invention is roughly divided into a personal computer A for screen operation and a workstation B for automatically planning the production process. B is connected to LAN (L
ocalArea Network).

That is, the output of the input unit 11, which inputs production request data such as which products, how many units, and when to manufacture them, is led to the main control unit 12, which controls the operation of each part of the personal computer A. The unit 12 and the first storage unit 13 and second storage unit 14, which are external databases, are each bidirectionally connected.

The first storage unit 13 stores basic data such as data indicating the manufacturing time for each product to be manufactured and data indicating the setup change time for each mold on each molding line. , the second storage unit 14 stores various constraint data and various objective function data during the production process.

Here, the constraint data includes, for example, numerical data such as the product delivery date, the number of possible setup changes during a predetermined period for each molding line, and the quantity of molds in stock for each molding line.
For a certain product group e, if the molding machine stops manufacturing at night after being allocated, the time will be extended and manufacturing will continue until morning. ”, and objective function data is “priority n (n: 1, 2,
In all cases, select the combination of products with the minimum changeover time. ” data.

In addition, the output of the process correction unit 15 that corrects the production process allocation results (i.e., the production process planning sheet) created by this device is led to the main control unit 12, and the created production process planning sheet is displayed. Display unit 16 equipped with a CRT etc.
and the main control section 12 are bidirectionally connected. The main control section 12 is configured to correct necessary parts of the production process plan displayed on the display section 16 based on correction instructions from the process correction section 15. In addition, the main control unit 12 sends data indicating the production process plan displayed on the display unit 16.
The output of the printer 1 is led to a printer 17.
7, the production process planning sheet is printed out.

Further, the main control section 12 and the control section 22, which is a component of the workstation B, are bidirectionally connected by a communication line 31. The control section 22 controls the operation of each section of the workstation B, and the control section 22 and the production allocation order determining section 23 are bidirectionally connected.

The production allocation order determining unit 23 selects the input unit based on basic data such as the manufacturing time per piece of each product stored in the first storage unit 13 and the changeover time of each molding die in each molding line. The production request data input from 11 is classified according to a certain standard, and the production allocation order for each classification is determined. Here, classifying based on certain criteria means
For example, classification is based on similarities in product usage purposes, classification is based on similarities in seasonal sales trends, etc. In addition, production allocation order 1, 2, 3, etc. are the orders with the highest production demands. Order 1: I want it immediately.

Order 2: I want it immediately after order 1.

Order n: I want it immediately after order n-1.

This is what it means.

Further, the control section 22 and the production process allocation calculation selection section 24 are bidirectionally connected.

The production process allocation calculation selection unit 24 is connected to the first storage unit 13
Basic data stored in and production allocation order determining unit 23
It has a function of calculating all possible combinations of production process allocations based on the production allocation order of each category determined by Storage part 1
It has a function of selecting an optimal production process allocation result from all combinations of production process allocations based on various constraint data and various objective function data stored in 4. The selected optimal production process allocation result is stored in a third storage section 25 bidirectionally connected to the control section 22. Further, the selected optimal production process allocation result is displayed on the display section 27 via the control section 22, and is also displayed on the communication line 31 and the main control section 12.
It is designed to be displayed on the screen of the display section 16 via.

Note that the input section 11 and the process correction section 15 described above are constituted by a keyboard and a mouse equipped with a numeric keypad and the like.

Next, the operation of the production process schedule creation apparatus having the above configuration will be explained with reference to the flowchart shown in FIG.

To create a production process schedule, an operator first operates the input unit 11 to input production request data such as which products, how many pieces, and when to manufacture them (step Sl). This production request data is stored in the main control unit 1
2. It is input to the production allocation order determining unit 23 via the communication line 31 and the control unit 22. Production allocation order determining unit 2
3, the derived production request data is classified based on reference data given from the external database 51 (first storage unit 13). Here, the standard data includes, for example, standard data classified based on the similarity of the purpose of use of the products (for example, product group A used in the kitchen, product group A used for sports, etc.), and seasonal sales trends. This refers to data such as standard data classified based on similarity (for example, product group e that sells well in early spring, product group f that sells well in early summer, etc.), and is selected and used as necessary.

The production allocation order determining unit 23 classifies various products requested for production based on standard data classified based on the similarity of seasonal sales trends, for example, and determines the allocation order (1, 2) of the classified product groups. , 3...) is determined. The allocation order (1, 2, 3...) is the order of highest production requirements, and as mentioned above, the product group assigned the order (hereinafter referred to as priority) 1 is immediately The product group with priority 2 indicates the product group that is needed immediately after the production of the product group with priority 1, and the product group with priority n has priority n-1
The product group that is required immediately after the product group is manufactured is shown (step S2).

FIG. 3 shows an example of the allocation list for each product group allocated by the production allocation order determining unit 23 in this manner.

In the figure, products (1), (5), and (9).

(14), (16), (17), (
For example, product 18) belongs to product group e that sells well in early spring, and its priority level is 1. In addition, products (2), (4
).

For example, items (8), (10), (15), and (19) belong to product group f that sells well in early summer, and have a priority of 2.

The production request data for which each classification and allocation order have been determined by the production allocation order determining section 23 in this manner is provided to the production process allocation calculation selection section 24 via the control section 22 .

The production process allocation calculation selection unit 24 calculates all possible process allocation combinations based on the production request data derived from the production allocation order determination unit 23. For example, make the following allocation. That is, priority n
(n = 1.2...) are allocated sequentially to the left of the process planning table and to the right. Next, for each combination of allocations, the production of each product included in the derived production request data and the manufacturing time per product read out from the first storage unit 13 are determined. The process time (time required for manufacturing) is determined, and then the time interval between adjacent manufacturing processes is determined based on the set-up time for each product mold read from the first storage section 13.
knob S3).

Then, a Gantt chart-style process plan table (hereinafter referred to as process plan data) is created for each combination based on the manufacturing process time interval for each product and the time interval between adjacent manufacturing processes determined in this way. (Step S4).

In the process of this process allocation, it is determined whether or not to apply constraint conditions (step S5). When applying constraint conditions, the necessary constraint data are selected from various constraint data stored in the second storage unit 14. The constraint data is read into the production process allocation calculation selection section 24 via the main control section 12 and the control section 22 (step S6). For example, assume that the following item in the constraint data is read. In other words, "For product group e, if the production of the molding machine stops at night after the assignment, the production time will be extended until morning." In this case, the product of the assigned process will be part of the product group. Check whether the product belongs to category e (step S?), then check whether the process stop time is night (step S8), and if both are applicable, the product will be manufactured until morning. The assigned process is corrected so that the process is stopped in the morning (that is, the process is stopped in the morning) (Step S9). Furthermore, if the constraint condition is not applied in step S5, and if the product of the process assigned in step S7 does not belong to product group e, the process proceeds to the next process without modifying the process (step 510). proceed.

Next, in the process of process allocation, it is determined whether or not objective function data is to be applied (step 511). If objective function data is to be applied, - various objective functions stored in the second storage section 14 are Necessary objective function data is read from the data into the production process allocation calculation selection unit 24 via the main control unit 12 and the control unit 22 (step 512). For example, assume that the next item in the objective function data is read. In other words, "In all cases for products with priority n (n = 1.2...), select the combination with the minimum changeover time." In this case, the product category currently being targeted is priority n. If the classification of the product is priority n (step 513), then the combination with the minimum total setup change time is selected from all the combinations of allocations (step 513). Step 514).

In addition, if the objective function data is not applied in step Sll, and if the target product classification is not priority n in step S13, an arbitrary combination is selected from all the combinations of allocation (step 515).

The process plan data selected in this way is
It is stored in the third storage section 25 and displayed on the display section 16 via the control section 22 and main control section 12 (step 516).

FIG. 4 shows an example of process plan data displayed on the display section 16 in this manner. In the same figure, M-0
1, M-02, . . . indicate the distinction between each molding line. However, the production quantities and color types for the product names shown in FIG. 3 do not necessarily match those in the allocation list for each product group shown in FIG.

Thereafter, while looking at the process plan data displayed on the display unit 17, if the operator determines that it is necessary, insert, delete, move, divide, etc. by operating the process correction unit 15.
Modifications such as composition are performed (step S17, 31B). At this time, as shown in FIG. 5, the combination of a multi-window system and a mouse makes operations extremely easy. Further, as shown in FIG. 6, since a part of the screen can be enlarged and displayed, detailed information in units of time can be viewed, and corrections can be made thereon.

The final process plan data corrected in this way is
It is printed out by the printer 17 (step 5).
19) will be given to each manufacturing worker as a manufacturing work instruction sheet.

(Effects of the Invention) According to the present invention, various objective functions are used properly, and
By considering many constraints and multiple lines, it is possible to realize a production process plan creation device that can be applied in almost all cases to a multiple line production system. In addition, the present production process plan creation device can significantly shorten the time required for one month of process planning, and also make it possible to create detailed process plan data with high production efficiency.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the electrical configuration of the production process planning sheet creation device of the present invention, Fig. 2 is a flowchart for explaining the operation of this device, and Fig. 3 is a list of assignments for each product group. Figure 4 is a diagram showing an example of process plan data displayed on the display unit, Figure 5 is a diagram showing an example of process correction on the display screen, and Figure 6 is an enlarged display of a part of the screen. It is a figure showing a state. 11... Input section 12... Main control section 13... First storage section 14... Second storage section 15... Process correction section 6... Display section 7... Printer 2 ...Control section 3...Production allocation order determining section 4...Production process allocation calculation selection section 5...Third storage section 7...Display section

Claims (1)

[Claims] 1) In a production system in which multiple products of different types are produced simultaneously and in parallel on multiple molding lines, production requests such as which products, how many pieces, and at what time are input are input. an input section; a first storage section that stores basic data such as the manufacturing time per piece of each product and the setup change time of each mold on each molding line; and a first storage section that stores various constraint data and data during the production process. a second storage unit that stores various objective function data; a production allocation order determining unit that classifies the production requests input from the input unit based on a certain standard and determines the order of production allocation for each classification; Based on the basic data stored in the first storage unit and the production allocation order of each category determined by the production allocation order determining unit, all combinations of production process allocations of the respective categories are calculated, and the an operation selection unit that selects an optimal production process allocation result from among the calculated production process allocation results for each of the categories based on various data stored in a second storage unit; a process correction unit capable of correcting the production process allocation result selected by the calculation unit; and an output unit that outputs the optimal production process allocation result selected by the calculation selection unit and corrected by the process correction unit. A production process planning sheet creation device characterized by: