JP3047675B2 - Production ratio control method and production ratio control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production ratio control method for controlling a production ratio in a production system for producing a plurality of types of articles on a plurality of production lines and collectively storing them in respective types of storage means. Related to the device. Note that all products, parts, and the like produced by the multi-product production system are referred to as "articles" in this specification. In this specification, the term "production" or "production processing" refers to any operation on a material, for example, not only processing operations such as cutting, but also general operations related to production such as assembly of parts. Is widely included.

[0002]

2. Description of the Related Art In a multi-product production line for producing a plurality of types of articles, the production ratio is controlled in order to maintain the production ratio between types at a ratio determined by a production plan. As a specific example of the production ratio control method, for example,
There is an invention of a device for controlling a production ratio of a work in a production line described in Japanese Patent No. 40146. In the technology described in this publication, a production instruction to a multi-product production line is issued based on a so-called leveling table that determines the frequency of production and the order of production between types based on a production plan. . If the number of stocks on the post-process side of the type for which the production instruction is to be issued is large, the production instruction is stopped, and the next order type is instructed.

The specific contents of such a production ratio control device will be described with reference to FIGS. 7 and 8. FIG.
FIG. 1 is a diagram showing an overall configuration of a multi-product line using a conventional production ratio control device. In the multi-product line 102 shown in FIG.
Through the network 170 connected to 80, systematic control of the entire production line is performed. This network 170 includes three branch networks 170A, 170
B and 170C.
10A, 110B, and 110C. As shown in FIG. 7, the multi-product production line 102 includes four stock conveyors 130, 140, 150, and 160.
And three production processing devices 136, 1 provided therebetween.
46, 156.

[0004] Of the four stock conveyors, the second stock conveyor 140, the third stock conveyor 150, and the fourth stock conveyor 160 are provided with excess stock detection sensors 142, 152, and 162, respectively. The excess inventory detection sensors 142, 152, 162 are connected to the production instruction devices 110A, 110B, 110C by detection signal lines 124A, 124B, 124C, respectively. Further, the production instruction devices 110A, 110B,
110C has instruction signal lines 128A and 128A, respectively.
B, 128C are connected, and instruction signal lines 128A,
128B and 128C are the first to third stock conveyors 13
0, 140, 150 unloading devices 134, 144, 154
It is connected to the. Each stock conveyor 130, 14
In 0, 150, and 160, storage spaces are provided for storing various types of articles separately for each article. Excess inventory detection sensors 142, 152, 162
Are provided one by one at predetermined positions in the storage space.

Now, multi-product production having such a configuration is described.
In line 102, production processing of a plurality of types of articles is performed.
This is performed as follows. Production instruction device shown in FIG.
A predetermined signal is output from the device 110A to the unloading device 134.
Then, the article P in the first stock conveyor 130₁,
P_Two, P_ThreeOne of them was moved to production processing equipment 136
After the predetermined processing, the second stock conveyor 140
It is carried in. Similarly, from the production instruction device 110B
When a predetermined signal is output to the unloading device 144, the second strike
P in the conveyor 140₁, P_Two, P_ThreeOf
One is transferred into the production processing device 146, and the transferred article is
P₁, Two types of goods P ₁₁, P₁₂After being processed into
Is transported into the third stock conveyor 150. Moved
Item is P_Two, P_Three, The production processing device 14
6 after being processed in the seeds of the third stock conveyor 150
Class P_TwoOr P_ThreeTransported to the storage space. Raw
Similar control is performed in the production instruction device 110C.
You.

Thus, the second to fourth stock conveyors 1
Each article is stored in the storage space of 40, 150, 160, and when the number reaches a predetermined number, the excess inventory detection sensor 14
2, 152, 162. The detection signals of the excess inventory detection sensors 142 to 162 are detected by the detection signal line 124.
A to 124C, the production instruction devices 110A to 110A
Input to C. For example, let us consider a case where only the process of producing the articles P ₁₁ and P ₁₂ from the article P ₁ by the production processing apparatus 146 is temporarily stopped during the production processing in the multi-product production line 102. At this time, while the number of articles P ₁ carried out from the second stock conveyor 140 decreases, the number of articles P ₁ carried in from the production processing device 136 is the same as usual, so that the articles P _{1 on} the second stock conveyor 140 The number of stocks in ₁ will gradually increase. As a result, the detected inventory plethora of articles P ₁ by excess inventory sensor 142, predetermined signal to the production instruction device 110A via the detection signal line 124A is output. In response to this, the control to reduce than usual number of production article P ₁ is carried out.

The specific contents of this control will be described with reference to FIG. FIG. 8 is a diagram showing an example of leveling table data used in the conventional production ratio control method. Based on the production plan, the ratio of the production numbers of the articles P ₁ , P ₂ , and P ₃ is determined in advance (30:20:10 in this case). No. of the leveling table 190. 1 to No. 200
Indicated numbers 1, ₂ , ₃ corresponding to the article types P ₁ , P ₂ , P ₃ are assigned to the frames up to the above based on this ratio. Here, at a rate of 10% for each article, 1
Numbers of the 00s (101, 102, 103) are assigned. The number in the 100's is an instruction number meaning that the instruction is omitted when the stock number becomes excessive. That is, the number 10 in the 100s corresponding to the article P ₁
1 is in the frames is indicated, usually production instructions of the article P ₁ is carried out. However, as in the above example, FIG.
Of if excess inventory sensing inventory plethora of articles P ₁ by the sensor 142 is detected, an instruction number 101 of frame (e.g. No.1, No.21, ...) is an instruction is ignored, the following The frame is instructed. In this way, production control of a type in which the number of stocks becomes excessive in the post-process is performed.

[0008]

Here, a plurality of such multi-product production lines are arranged in parallel, and a plurality of articles produced by the plurality of production lines are grouped by type into a single stock conveyor. Consider a production system to store. Also in such a production system, the production ratio can be controlled by a method similar to the above-described conventional example. That is, the number to be thinned out is set in advance by using a leveling table having 100 frames in the designated number as shown in FIG. 8 for each production line. On the other hand, in the single stock conveyor, the excessive stock detection sensor 14 shown in FIG.
The same sensor as that of No. 2 is provided for each type. If the excess inventory sensor detects that the number of specific types of inventory is excessive, the production instruction for the next frame is omitted, omitting the production instruction for the 100th frame. In this way,
Even in multiple multi-product production lines installed in parallel,
It is possible to perform control to reduce the number of productions of the type of which the number of stocks is excessive.

However, according to such a production ratio control method, when there are a plurality of lines for producing the type for which the excess inventory is detected, production control is performed simultaneously on the plurality of production lines. That is, the signals of the 100-th frame in the plurality of production lines are omitted by the signal of the excessive stock detection sensor provided in the single stock conveyor. As a result, the production decrease for the excessive inventory becomes too large, and the appropriate production ratio control is not performed. In addition, when there is a line that produces only the type of excessive stock among a plurality of production lines, the production line is not provided with frames of the designated number of 100s.
Therefore, in this production line, the production of the type is continued, while in the line for producing a plurality of types including the type, the production instruction of the 100-th frame is omitted, and the appropriate production ratio control is not performed. . Furthermore, when the operation status of each production line is not uniform, such as when only one of a plurality of lines that produce the same type is stopped, the deviation of the production ratio becomes larger. As described above, in a production system in which a plurality of multi-product production lines are provided in parallel, there is a problem that a production ratio between a plurality of types cannot be maintained. In view of the above, an object of the present invention is to provide a production ratio control method and apparatus capable of reliably maintaining a production ratio between a plurality of types in a multi-product production system at a ratio determined by a production plan.

[0010]

Therefore, in order to solve the above problems, the present invention has created a production ratio control method according to the first aspect of the present invention, the structure of which is shown in the schematic diagram of FIG. That is, in this production ratio control method, a plurality of types of articles M4 to M4 are produced, and at least one production line is a plurality of production lines M6 that produce two or more types of articles.
A production ratio control method for a production system M2 that produces products at M6 to M6 and collectively stores the products produced at each production line M6 to M6 in a type-specific storage unit M8 provided for each type M4 to M4. A step M10 of detecting an excessive stock of each type M4 to M4 in the type-specific storage means M8,
Each time one type of article is instructed to be produced, a type-specific counter M1 corresponding to each type regardless of which production line among a plurality of production lines M6 to M6 is instructed to produce.
A step M12 for increasing 4 by 1; a type specifying step M16 for specifying a type in which an excess of inventory among a plurality of types is detected and the type-specific counter M14 exceeds a predetermined value;
Type specifying step M16 of the plurality of production lines M6 to M6
A step M18 of omitting the production instruction for the specified type in the production line that produces the type specified in step (1) and the other types and advancing the frame of the production instruction information by one, and a type-specific counter M14 for the type To the initial value.

According to another aspect of the present invention, there is provided a production ratio control apparatus for producing a plurality of types of articles, wherein at least one production line produces a plurality of types of articles for producing two or more types of articles. A production ratio control device for a production system for producing on a production line and collectively storing articles produced on each production line in a type-specific storage means provided for each type, provided in the type-specific storage means. An excess inventory detecting means for detecting an excess of the respective types of inventory and outputting a predetermined signal, provided for each of the plurality of types,
Each time one of the types of articles is instructed to be produced, the type-specific counter is incremented by 1 irrespective of which production line of the plurality of production lines is instructed, and the inventory of the plurality of types is A type specifying unit that outputs the predetermined signal from the excess detection unit and specifies a type in which the type counter exceeds a predetermined value; and a type specified by the type specifying unit among the plurality of production lines. A production instruction means for omitting a production instruction for the specified type in a production line for producing the other type and a next type of production instruction, and the type-specific counter for the specified type. A production ratio control device characterized by having a counter initialization means for returning to an initial value has been created.

[0012]

According to the production ratio control method according to the first aspect of the present invention, at least one production line for producing a plurality of types of articles M4 to M4 produces a plurality of productions for producing two or more types of articles. The products produced in the production lines M6 to M6 and the products produced in the production lines M6 to M6 are collectively classified into various types M4.
The production ratio control in the production system M2 for storing in the type-specific storage means M8 provided for each of .about.M4 is executed as follows. First, in step M10, an excess of the stock of each type M4 to M4 in the type-specific storage unit M8 is detected. Next, in step M12, each type of article is 1
Each time an individual production instruction is given, a plurality of production lines M6 to M6
Regardless of which production line the production instruction is issued, the type-specific counter M14 corresponding to each type is incremented by one. Then, in the type specifying step M16, of the plurality of types M4 to M4, an excess of the stock is detected in the step M10, and a type in which the type counter M14 exceeds a predetermined value is specified in a step M12.

Subsequently, in step M18, a production instruction for the specified type is omitted in a production line that produces the type specified in the type specifying step M16 and other types among the plurality of production lines M6 to M6. Then, the frame of the production instruction information is advanced by one. Then, in step M20, the type-specific counter M for the type
14 is returned to the initial value. By repeating the above steps M10 to M20, it is possible to execute consistent production reduction control for all types of production lines that produce the type for which the excessive inventory has been detected. In this way, a plurality of types of articles are produced on a plurality of production lines in which at least one production line produces two or more types of articles, and the articles produced on each production line are collectively provided for each type. In the production system for storing in the type-specific storage means, it is possible to perform control for surely maintaining the production ratio among a plurality of types at the ratio determined in the production plan.

Further, in the production ratio control device according to the second aspect, the excess inventory detecting means detects an excess of each type of inventory provided in the type-specific storage means, and outputs a predetermined signal. . On the other hand, the type-specific counter provided for each type is incremented by one every time one type of article is instructed to be produced, regardless of which production line has been instructed to produce. Then, the type specifying means outputs a predetermined signal from the excess inventory detecting means among the plurality of types, and specifies the type for which the type-specific counter exceeds a predetermined value. For the specified type, the production instruction means omits the production instruction on the production line that produces the type and the other types out of the plurality of production lines, and advances the frame of the production instruction information by one. Are given. Then, the type-specific counter for this type is returned to the initial value by the counter initializing means. By repeating the above control, consistent production reduction control is performed for all types of production lines that produce the type for which the excess inventory is detected, and appropriate production ratio control is achieved.

[0015]

Next, an embodiment of the present invention will be described.
This will be described with reference to FIGS. FIG. 2 shows the present invention.
Of production ratio control method and production ratio control device
Shows the overall configuration of a multi-product production system to which the embodiment is applied
FIG. As shown in FIG. 2, the production ratio of this embodiment
The control device 2 controls the production ratio of the multi-product production system 4
Production ratio control device for Multi-product production system
4 has four production lines 32, 34, 36, 38, seeds
Assorted stock conveyors 40 and the connections between them
Transport line 30. Stockco by type
Conveyor 40 has three types of articles P₁, P_Two, P_ThreeEach
Storage space 40A, 40B, 40 for storing by type
C. These storage spaces 40A, 40B, 4
Each type P₁, P_Two, P_ThreeIn stock
Excess inventory detection sensor 42 for detecting an excessive number
A, 42B and 42C are provided. Note that FIG.
In addition, the excess inventory detection sensors 42A to 42C
Article P ₁, P_Two, P_ThreeIn the same position for all
However, the position for each type is determined according to the production plan.
Needless to say, it can be changed.

These excess inventory detection sensors 42A-42
C is connected to the ratio control unit 8 by a detection signal line 44. This ratio control unit 8 has a CPU
(Central processing unit) and a computer system mainly configured with RAM and ROM memory devices. On the other hand, the four production lines 32 to 38 are provided with pre-process side stock conveyors 22, 24, 26, and 28, respectively. These pre-process side stock conveyors 22 to
28, line-by-line production instruction devices 12, 14,
16 and 18 are provided. The production instruction signal lines 10 from the ratio control unit 8 are connected to these line-specific production instruction devices 12 to 18. Further, on the post-process side of the four production lines 32-38, a transport line 30 is provided.
The articles produced in each of the lines 32 to 38 are transported by the transport line 30 and stored in the stock conveyor 40 by type.

In the multi-product production system 4 having such a configuration, three types of articles P ₁ , P ₂ , and P ₃ are produced under the control of the production ratio control device 2.
The specific contents of the control will be described with reference to FIG. 2 and FIGS. FIG. 3 is a diagram showing a leveling table representing an entire production plan and line data representing a production plan for each production line in this embodiment. 4 and 5
6 is a flowchart illustrating a procedure of production ratio control in the present embodiment, and FIG. 6 is a diagram illustrating a production ratio of each production line in the present embodiment. First, based on the production plan of the multi-product production system 4, the entire leveling data 50 shown in FIG. 3 is determined. In this embodiment, FIG.
As shown in the figure, the goods P ₁ ,
The production ratio of P ₂ and P ₃ is set to 50:50:20. Based on this ratio, the overall leveling table 50 of FIG.
No. 1 to No. Instruction numbers 1, ₂ , and ₃ corresponding to the articles P ₁ , P ₂ , and P ₃ are allocated to up to 200 frames.

Here, 1% at a rate of 10% for each article.
Numbers in the 00s (101, 102, 103) are assigned. The number in the 100's is an instruction number meaning that the production instruction is omitted when the number of stocks of the corresponding type is larger than expected, and the production ratio is adjusted accordingly. Production plan data 52 to 58 for each production line determined based on the overall data 50 are
From the ratio control unit 8 to the production instruction device 12, 1 for each line
4, 16, and 18. Based on the production line data 52 to 58, the production instruction devices 12, 14, 16,
From 18, a signal requesting a production instruction is output to the ratio control unit 8.

In accordance with the production instruction request signal, a predetermined calculation process is performed in the ratio control unit 8, and the result is output as a production instruction signal to the production instruction devices 12, 14, 16, and 18 for each line. It is output from the production instruction signal line 10. As a result, in the line-by-line production instruction devices 12 to 18 that have received the production instruction from the ratio control unit 8,
Parts and the like for producing each article from the pre-process side stock conveyors 22 to 28 are carried into the production lines 32 to 38,
Production takes place. The articles produced on the production lines 32 to 38 are conveyed on the conveyance line 30 and are stored in predetermined storage spaces 40A to 40A of the stock conveyor 40 by type.
Stored in C. Here, each storage space 40A-40
When the inventory number of the articles in C exceeds a predetermined number, the excess inventory detection sensors 42A to 42C pass through the detection signal line 44,
A detection signal corresponding to the type is output to the ratio control unit 8.

[0020] As an example, consider the case where only the goods P ₁ in kind by stock conveyor 40 has become excess inventory.
For example, in a step after (not shown) subsequent to the multi-product production system 4 only steps relating to the article P ₁ is a case or the like is paused. In this case, first, the excess inventory detection sensor 42
By A, is detected inventory plethora of articles P _1, a predetermined signal is output to the ratio control unit 8 through the detection signal line 44. In response to this, the ratio control unit 8, the first production line 32 and the third producing articles P ₁
Control to reduce than usual number of production article P ₁ in the production line 36 is performed. That is, the entire data 50 in FIG.
For each number corresponding to the instruction number 101 in the production instruction of the article P ₁ is omitted. However, as shown in FIG. 3, only the article P ₁ in the first production line 32 is produced, the omission of the production instruction article P ₁ in the first production line 32 is not performed. Therefore, the third production line 3
Omission of the production instruction article P ₁ is performed in 6 only.

FIGS. 4 and 5 show specific control procedures.
This will be described with reference to a flowchart. Figures 4 and 5
The control program shown in the flowchart is a ratio control unit shown in FIG.
Is stored in the ROM of the unit 8 and the ratio control unit.
8 is executed on the CPU and RAM. Well,
When the control is started in step S10, first, the production
N (here, N = 3), and each type P
₁, P_Two, P_ThreeProduction plan (D_i) Is entered
(Step S12). Production plan (D_i) Is raw between species
Input as a production ratio, here as shown in FIG.
And P₁: P_Two: P_Three= 50: 50: 20. Continued
And each type P₁~ P_ThreeProduction plan change rate for
That is, the appearance ratio of 100s in the table of FIG. 3 or unreserved seats
Ratio) R_iIs input (step S14). This implementation
In the case of the example, the production plan change rate R_iIs for all types
Same, R _i= 10%.

Next, the number L of production lines (here, L =
4) and the production ratio (D _ij ) of each type (i) in each production line (j) is input (step S16). The contents of the production ratio (D _ij ) are shown in FIG. Then, from the data of the production ratio (D _ij ), the number j * of the production line that produces two or more types is input (step S).
18). In this case, the third line (P ₁ and P ₂₎ and the fourth line (P ₂ and P ₃₎ is subject to any applicable production line for producing two or more. Then, the variable S _k corresponding to the instruction request signal for each production line is cleared, it is set to zero (step S20). Further, the value of the production ratio (D _ij ) input in step S16 is leveled, and the entire leveling table data 50 as shown in FIG. 3 is created. Then, line data 52 to 58 (DH _j ) for each production line shown in FIG. 3 are created from the entire data 50 and transferred to the production line instruction devices 12 to 18 (step S22).

Subsequently, the total number of frames X _j MAX of each line data DH _j is input (step S24), and the frame No. of each line data DH _j is input. Variables X _j representing the is initialized (step S26). Then, the value of the counter CNT _i for accumulating the number of the production instruction for each type are all initialized (step S28). Next, the counters CNT _i, a predetermined value TCNT _i is calculated and inputted (step S30). This predetermined value TCN
T _i is a value corresponding to each type of production plan change ratio R _i input in step S16, and TCNT _i = (IN
T) (1 / R _i ). In the present embodiment, since the production plan change ratio R _i = 10% for all three types, TCNT _i = 10 for all i. With the above processing, preparations for performing the production ratio control are prepared, and in the following steps, the production ratio control is executed along with the actual production in the multi-product production system 4.

First, a production instruction request signal from each production line
Is the variable S_kIs stored as For example, first production
The production line requesting instructions is the third production line
Variable S₁Is input to (ie, S₁
= 3). The following is the second request for production instructions
The line number j of the production line is a variable S_TwoEntered in the third
The number j of the production line is the variable S_ThreeThe fourth production line
In number j is variable S _Four(Step in FIG. 5)
S32). Next, the variable j corresponding to the production line number is
The initial value is set to 1 (step S34). And step
In step S36, the variable S₁Is determined to be zero or not
You. If this determination is YES, that is, which production line
If no production instruction request signal is output from
The process returns to step S32 to wait for a production instruction request. Steps
If the determination in S36 is NO, any of the production
Means that the production instruction request signal has been output from the
Therefore, the process proceeds to step S38, where a production instruction is first requested
It is determined which production line is being used.
That is, the processing of step S38 and step S40
Are the variables S in order from the line number j = 1.₁Input value of
This is repeated until the value matches the value of the line number j.

When the production line requesting the production instruction is specified first in this way, subsequently, the type of the product whose production instruction is specified in the line data of the production line j is specified ( Steps S42 to S46).
First, the variable i corresponding to the type P _i of the article is the initial value 1 (step S42). Then, based on the line data (52 to 58 in FIG. 3) of the specified production line j, the current frame No. In X _j (here, X _j = 1), the type P _i
Is instructed. That is, the frame No. of the line data of the specified production line j. For 1, 1-position of the indicated number of DX _j is i or not (here i = 1) or not is judged (step S44). Here, the first position indication number DX _j is the i unless step S46 i = i
After +1 is performed again determination of step S44, the processing in step S44~S46 is 1 digit of instruction number DX _j is repeated until it coincides with the value of the variable i.

In this way, after the type of the article whose production is instructed is specified in the line data of the production line j, it is determined whether or not to execute the production instruction (steps S48 to S56). . First, the type i
The value of the counter CNT _i is advanced by 1 (step S
48) Then, the new value of CNT _i is set in step S
Whether exceeds a predetermined value TCNT _i set in 30 is determined (step S50). If this determination is NO, the cumulative number of production of the type i is determined by the total data 50 in FIG.
Has not yet reached the number corresponding to the thinning interval set in. Therefore, the process proceeds to step S52, and the production instruction of the type i is issued as scheduled. On the other hand, if the determination in step S50 is YES, subsequently, it is determined whether or not the production line j is a line that produces two or more types (step S54). If this determination is NO, the production line j is a line that produces only one type (that is, type i). Therefore, since the production instruction is not a target to be omitted, the process proceeds to step S52, and the production instruction of the type i is performed as scheduled.

On the other hand, the determination in step S54 is YE
In the case of S, it is further determined whether or not the ratio change signal for the type i is ON (step S56). That is, the excessive stock detection sensor 42 shown in FIG.
From A to 42C, it is determined whether or not the excess inventory detection signal corresponding to the type i is output to the ratio control unit 8. If this determination is NO, the type i is not in excess, and the process proceeds to step S52, where a production instruction of the type i is issued as scheduled. On the other hand, if the determination in step S56 is YES, step S5
Since all the conditions of 0, S54, and S56 are satisfied, the process of omitting the type i production instruction is performed. That is, the value of the counter CNT _i of the type i after initialized in step S58, the process proceeds to step S60 without performing the production instruction step S52. Also, when a type i production instruction is issued in step S52,
Subsequently, the process of step S60 is performed.

In step S60, the frame number of the line data of the production line j is determined. After X _j is incremented by one, it is determined whether or not the new value of X _j has exceeded the number of frames X _j MAX of the line data input in step S24 (step S62). If this determination is YES, it means that the line data of the production line j has made one round, and thus the frame No. in step S64. After returning _Xj to 1, the process returns to step S32 and the same processing is repeated. On the other hand, if the determination in step S62 is NO, the frame No. While _leaving X _j as it is, step S32
And the same processing is repeated.

To summarize the above description, the flow charts of FIGS.
-In the control of the chart, the production instruction for each type i
Counter CNT for accumulating the counted number_iIs provided
ing. This counter CNT_iWhich production line
Regardless of whether or not the type is specified,
Is increased by one at a time. And this counter CNT _i
Is the thinning rate R_iPredetermined value TCNT corresponding to_iUntil it reaches
Then, the type i production instruction is executed without being omitted.
You. Also, the type of the production line j requesting the production instruction is
Even if the line produces only i, the production of type i
The instruction is executed as it is. In addition, excessive inventory of type i
Even when the detection signal is not output, the type i production finger
The indication is executed without omission. In contrast,
Unta CNT_iIs the predetermined value TCNT_iIs beyond production
Line j is a line that also produces types other than type i.
The excess inventory detection signal of type i is output.
If all three conditions are satisfied, the type i
A process for omitting the production instruction is performed.

By following the above-described processing procedure, when an excessive number of types i is detected, the type i
Consistent production reduction control can be performed for all of the production lines that produce. Thus, the stock quantity of the type i is appropriately controlled. Thus, the three types of articles P produced on the four production lines 32, 34, 36, 38
_In the multi-product production system 4 in which ₁ , P ₂ , and P ₃ are collectively stored for each type in the stock conveyor 40 for each type, the production ratio among the three types is determined by the ratio (5
0:50:20).

In the present embodiment, a case where three types of articles are produced on four production lines has been described, but the number of types of articles and the number of production lines are not limited to these. Also, the case where two types of articles are produced by two of the four production lines is described as an example, but the number of production lines for producing a plurality of types may be one or three or more. Further, the same control can be performed when three or more types of articles are produced in one production line. Also, the change rate of the production ratio is the same 10% for all the articles.
However, it goes without saying that it may be changed for each type of article. The production ratio between the types of articles is only an example, and various ratios can be taken according to the applied process. The other steps of the production ratio control method and the configurations of the other parts of the production ratio control device and the production system are not limited to the present embodiment.

[0032]

According to the present invention, in a production system in which a plurality of types of articles produced on a plurality of production lines are collectively stored for each type and stored in a type-specific storage means, regardless of which production line the product is produced on In order to create a production ratio control method that counts the number of production instructions for each type of article and omits the production instruction for each predetermined number of production instructions for a type with excessive inventory, in such a multi-product production system, The production ratio between a plurality of types can be reliably maintained at the ratio determined in the production plan. As a result, in a multi-product production system, stable production can be performed while always maintaining the production ratio determined based on the production plan, and an extremely practical production ratio control method is provided.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing an overall configuration of a production ratio control method and a production ratio control device according to the present invention.

FIG. 2 is a diagram showing an overall configuration of a production system in an embodiment of a production ratio control method and a production ratio control device according to the present invention.

FIG. 3 is a diagram showing a leveling table representing an entire production plan and line data representing a production plan for each production line in an embodiment of a production ratio control method and a production ratio control device.

FIG. 4 is a flowchart illustrating a procedure of a production ratio control in an embodiment of the production ratio control method and the production ratio control device.

FIG. 5 is a flowchart that follows the flowchart of FIG. 4;

FIG. 6 is a diagram showing a production ratio of each production line in an embodiment of a production ratio control method and a production ratio control device.

FIG. 7 is a diagram showing an overall configuration of a multi-product production system using a production ratio control method of a conventional example.

FIG. 8 is a diagram showing an example of leveling table data used in a conventional production ratio control method.

[Explanation of symbols]

M2,2 production system _{M4, P 1, P 2,} P 3 multiple types of articles M6,32~38 plurality of production lines M8,40 Type storage means M10 the step M12 Type counter for detecting the excessive inventory 1 M14 Type-specific counter M16 Type-specifying step M18 Production instructing step (step of incrementing the frame by one) M20 Step of resetting the type-specific counter for the type to the initial value 8 Type specifying means 8 Counter initializing means 8, 12- 18 Production instruction means 42A to 42C Inventory excess detection means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G05B 19/418 B23Q 41/08 G05B 15/02 G06F 17/60

Claims (2)

(57) [Claims] At least one production line produces a plurality of types of articles on a plurality of production lines for producing two or more types of articles, and the articles produced on each production line are collectively provided for each type. A production ratio control method for a production system for storing in a type-specific storage means, wherein the type-specific storage means detects an excess of each type of inventory, and one item of each type is produced. A step of increasing the type counter corresponding to each type by one regardless of which production line of the plurality of production lines is instructed each time the instruction is issued; A type identification step of identifying a type that is detected and the type-specific counter exceeds a predetermined value; and a type identified in the type identification step of the plurality of production lines and other types A step of omitting the production instruction for the specified type in the production line for producing the type and advancing the frame of the production instruction information by one, and returning the type-specific counter for the type to an initial value. A production ratio control method comprising: 2. A plurality of types of articles are produced on at least one production line by a plurality of production lines producing two or more types of articles, and the articles produced on each production line are collectively provided for each type. A production ratio control device for a production system for storing in a type-specific storage means, comprising detecting an excessive amount of each type of inventory provided in the type-specific storage means and outputting a predetermined signal. Detecting means, provided for each of the plurality of types, wherein each type of article is 1
A type-specific counter that is incremented by 1 regardless of which production line of the plurality of production lines is instructed each time the individual production is instructed; A signal is output, and a type identification unit that identifies a type in which the type-specific counter exceeds a predetermined value; and a type identified by the type identification unit and other types out of the plurality of production lines. A production instruction means for omitting a production instruction for the specified type in a production line to be produced and issuing a next type of production instruction; and a counter initialization for returning the type-specific counter for the specified type to an initial value. Means for controlling the production ratio.