JPH0557580A - Evaluation model forming method of production line - Google Patents

Abstract

PURPOSE:To form an evaluation model being inputted into a simulation system automatically on the basis of a layout drawing inclusive of information on a production equipment position or the like. CONSTITUTION:An arrow diagram as a process drawing is described doubly on a layout drawing (step s1, s2). In addition, operation conditions of respective functions corresponding to each node and each arrow are set up as comment data (step s3). Next, on the basis of the arrow diagram, a basic model file coordinated with each arrow name and each length of respective arrows is formed (step s4). Subsequently, on the basis of the comment data, an attribute file coordinated with each function name of respective functions corresponding to these nodes and arrows and the operation condition is formed (step s5). The basic model file and the attribute file are coupled together on the basis of each node name and each arrow name, through which an evaluation model is formed (step s6).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for a simulation corresponding to a layout drawing when a simulation of the production line is performed based on a layout drawing showing the layout of each function on the production line and the operating conditions of each function. The present invention relates to a production line evaluation model creation method for creating an evaluation model.

[0002]

2. Description of the Related Art When a computer assists the layout design of production equipment, it is general to evaluate the designed layout by simulation.
Since the layout is created as a layout drawing by the layout drawing creation system, in order to evaluate the layout by simulation, it is necessary to create input information (evaluation model) to the simulation system based on the layout drawing.

Since the input information to the simulation system is described by using a simulation language or a computer language, if an attempt is made to evaluate the layout of a production line by simulation, a specialized worker who is familiar with the simulation language or the computer language is required. , The layout model is analyzed and the information from the layout designer is obtained to create the evaluation model. That is, it is required that the layout designer and the evaluation model creator work together. In this kind of work, the layout designer may not be able to communicate sufficiently with the creator of the evaluation model and errors may occur in the evaluation model. Moreover, until the evaluation model is created and simulation is performed. There is a problem that it takes a long time.

In order to solve such a problem, a process chart is created using a Petri net code or a similar code, a flow chart is automatically created from the created process chart, and this flow chart is used as an evaluation model. Production line evaluation device for performing simulation (Japanese Patent Laid-Open No. 62-277250)
No. gazette) is considered. That is, the layout designer can perform the simulation only by describing the process chart using a code such as Petri net code. Since there are relatively few types of Petri net code, the layout designer himself needs to use the Petri net code. If the code is remembered, the creator of the evaluation model becomes unnecessary, and the time required from layout design to simulation is shortened.

[0005]

However, in the invention disclosed in Japanese Patent Laid-Open No. 62-277250, the layout designer remembers Petri net codes which are not yet widespread even though there are few kinds. However, there is a problem that the layout designer has to bear a heavy load.Also, although the process can be described in the process diagram described by the Petri net code, since it does not include information such as the position of the production equipment, the layout is not always required. It does not correspond one-on-one and there is a problem that the layout cannot be evaluated sufficiently.

An object of the present invention is to solve the above-mentioned problems, and an evaluation model to be input to a simulation system can be automatically created based on a layout drawing including information such as the position of production equipment. It is intended to provide a method for creating an evaluation model of the production line.

[0007]

According to the present invention, in order to achieve the above object, a simulation of a production line is performed based on a layout drawing showing the arrangement of each function on the production line and the operating conditions of each function. In the method for creating an evaluation model for a production line that creates an evaluation model for simulation that corresponds to a layout drawing, after creating the layout drawing, separate each at a position corresponding to the start point, end point, conversion function, and accumulation function of the production line. In addition to having a node with the node name of, and having an arrow corresponding to the transport function that connects between each node, it is overlaid on the layout drawing, then the conversion function, the storage function,
Regarding the transport function, the operating conditions necessary to create an evaluation model are set as comment data, and a basic model file that associates the arrow name of each arrow with the length of each arrow is generated based on the arrow diagram, and the comment data is generated. Generate an attribute file that associates the function name of each function corresponding to each node and each arrow with the operating condition based on, and combine the basic model file and the attribute file based on each node name and each arrow name. By doing so, an evaluation model is generated.

[0008]

According to the above method, an arrow diagram as a process drawing is overlaid on a layout drawing, and the operating conditions of each node and each function corresponding to each arrow of the arrow diagram are set as comment data. By overlapping the arrow diagram in the layout drawing, the position information of each function is included in the arrow diagram, and the arrow diagram can be used not only as a process diagram but also for evaluation of a layout including position information. You can do it. Moreover, since the arrow diagram is widely used, it does not burden the layout designer to use the arrow diagram. Even if the layout designer does not have the knowledge about the arrow diagram, the node and arrow It is quite easy to understand the arrow diagram represented by. Further, since the information represented by the arrow diagram and the information included in the comment data regarding the operating conditions are combined based on the node name and arrow name of the arrow diagram, the information included in the arrow diagram and the comment data are included. Information can be easily associated with each other.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram of an entire system for simulating a layout of a production line using an evaluation model creation processing unit 1 adopting the method of the present invention. The evaluation model creation processing unit 1 creates an evaluation model from the layout drawing between the layout drawing creation processing unit 2 that creates the layout drawing and the simulator 3 that simulates the production line based on the evaluation model corresponding to the layout drawing. It is applied for the purpose of automatically generating.

In the layout drawing creation processing unit 2, a CAD system (not shown) capable of easily inputting drawings using icon input or the like is used to input drawings showing the layout of each production facility (step S1), In addition, the nodes correspond to the start and end points of the production line, and the conversion function (processing machine, packaging machine, etc.) and storage function (storage, temporary stagnation, etc.) of each production facility, and the transportation between each node. An arrow diagram in which an arrow is associated with a function (conveyor or the like) is created (step S2), and the operating condition of each function shown in the layout drawing is input as comment data (step S3).

The layout drawing is as shown in FIG.
The layout of production equipment such as processing machines M1 and M2 and conveyors corresponding to each conversion function and storage function is described. With respect to this layout drawing, as shown in FIG. 2B, nodes P1 to P4 of the arrow diagram are given to the start point and the end point of the production line and the positions corresponding to the respective production facilities,
Further, as shown in FIG. 2C, an arrow diagram is created by connecting the nodes P1 to P4 with arrows A1 to A3 indicating the flow of work. On the screen D of the display device of the CAD system, the work is carried out in the procedure as shown in FIG. 2, and the data in which the layout diagram of the production facility is overlaid with the arrow diagram is stored in the drawing file F1. Here, in the arrow diagram, the arrows A1 to A3 are set so as to connect the nodes P1 to P4, ignoring the sizes of the processing machines M1 and M2.

The data stored in the drawing file F1 is
The data is a combination of basic geometric figures, and is a set of data in the form of a combination of a function name indicating a geometric figure and a coordinate value that gives the position of the geometric figure. That is, the data of the graphic file F1 is described as shown in Table 1, and the line segment in the layout drawing is Line,
The rectangle is represented by the function name Box, and the nodes in the arrow diagram are Symbol1 and the arrow is Sy.
It is expressed using the function name mbol2.

[0013]

[Table 1]

However, Line (X ₁₁ , Y ₁₁ , X ₁₂ , Y ₁₂ ) is a point (X
₁₁ (Y ₁₁ ) and the point (X ₁₂ , Y ₁₂ ), Box (X ₂₁ ,
_{Y 21, X 22, Y 22} ) is a side parallel to the axis of the screen of the display device, a rectangle and a point (X _21, Y ₂₁₎ and the point (X _22, Y ₂₂₎ and diagonal , Symbol1 (Nname, X ₁ ,, Y ₁ ) has a node name of Nname and represents a node represented by a small circle centered on the point (X ₁ ,, Y ₁ ), Symbol2 (Aname, X ₁₁ , Y ₁₁ , X ₁₂ , Y ₁₂ ) is
It has an arrow name of Aname, and from point (X ₁₁ , Y ₁₁ ) to point (X ₁₂ , Y
Y ₁₂ ).

The comment data includes information not included in the data stored in the drawing file F1.
The operating conditions required for the simulation are mainly set. Since the comment data is input from an input device such as a keyboard, as shown in FIG. 3, a comment display is provided in a part of the screen D of the display device of the CAD system separately from the drawing display area Da showing the layout drawing. Area D
It is designed to be interactively input according to the display of b. The types of comment data include, for example, attributes of each production facility (processing time, transfer speed, failure rate, etc.), workflow patterns of each node P1 to P4 (single flow, branch, merge), to each node P1 to P4. I / O conditions for the work. In the input / output conditions of the work, there are conditions that cannot be described only by the workflow pattern, such as the destination of the work in the branched flow in the branching pattern and the work in the merged flow in the merge pattern. There is the import source or the import / export timing. As comment data, Arrow A1
The transport speed between the nodes P1 to P4 connected by A3 to A3 and the processing time of the processing machines M1 and M2 are minimum required. The comment data is described, for example, as shown in Table 2, and each arrow A1 to A3 is represented by arranging the node names of the nodes P1 to P4 at the start point and the end point. Since each arrow corresponds to the transportation function, the comment display area D
In b, a colon (:) as a delimiter is displayed following the characters in which the node names of the start point and the end point of the arrow are arranged, and prompts the user to enter the transport speed. For the nodes P2 and P4 corresponding to the machining machines M1 and M2 among the nodes, an equal sign (=) as a delimiter is displayed after the names of the machining machines M1 and M2 so that the machining time can be input. Be prompted by. Here, the node names corresponding to the processing machines M1 and M2 are described in parentheses at the end of the line of the comment data regarding the processing machines M1 and M2. Further, it is assumed that the transport speed and the processing time are sorted in ascending order for the node name for each group. The comment data having such a format is stored in the comment data file F2.

[0016]

[Table 2]

The above-described processing can be realized by adding a function of inputting comment data to a layout drawing creating system which is a CAD system provided conventionally. Since the data stored in the drawing file F1 includes the conventional layout drawing and the arrow diagram, it can be considered that the positional information of the production facility is added to the arrow diagram which is the process chart.

Output information from the layout drawing creation processing unit 2 is input to the evaluation model creation processing unit 1. In the evaluation model generation system 1, the basic model file F3 is generated by the basic model file creation process (step S4) based on the data of the drawing file F1, and the attribute file creation process (step S4) is performed based on the data of the comment data file F2. The attribute file F4 is generated by S5).

In the basic model file creating process, as shown in FIG. 4, only the information regarding the arrow diagram is extracted from the drawing file F1 (step S41). That is, if the drawing file F1 has the data shown in Table 1, the symbol names Symbol1 and Symbol2 corresponding to the nodes P1 to P4 and the arrows A1 to A3 are searched and extracted. Each function Symbol1 (Nname, X ₁ , Y ₁ ), Symbol2 (Aname, X
₁₁ , Y ₁₁ , X ₁₂ , Y ₁₂ ), the nodes P1 to P4 at the start and end points of the arrows A1 to A3 can be known, and the lengths of the arrows A1 to A3 can be obtained (step S42). ), The arrow name of each arrow is represented by arranging the node names of the nodes P1 to P4 at the start and end points of each arrow, and the length of each arrow is associated with each arrow name (step S43). In this way, data in the format shown in Table 3 can be created and stored in the basic model file F3 (step S44).

[0020]

[Table 3]

On the other hand, the comment data stored in the comment data file F2 is read line by line as shown in FIG. 5 (step S51), and the comment definition in which the data in the format shown in Table 4 is registered in advance. The table T1 is collated (step S52). The comment definition table T1 has items of key, delimiter, unit, and remarks. Each line of the comment data is identified by comparing the first character with the key to identify the data corresponding to the node or arrow or other data. Here, when the first character of each line of the comment data is "P", it is determined to be a node, and when it is "M", it is determined to be an arrow. Further, the delimiter symbol indicates that the numerical data of each line of the comment data is started, and here, ":" and "=" are used. The separator is
The meaning of the numerical data changes depending on the type, and ":" indicates that the numerical data is speed,
“=” Indicates that the numerical data is time. The remark is
In addition to the type of production equipment (for example, conveyor or processing machine), this item is set according to various rules. For example, the remark () in the second line in Table 4 indicates that the processing machine M1 and the node name P are included in the comment data shown in FIG.
Used when associating with 2. That is, the comment definition table T1 is also used when configuring the input screen so that interactive input can be performed when inputting the comment data.

[0022]

[Table 4]

By collating the comment definition table T1 for each line of the comment data, the comment data can be converted into the format shown in Table 5 according to the information stored in the comment definition table T1 (step S53). ). Further, the data of this format is stored in the attribute file F4 (step S54).

[0024]

[Table 5]

A concrete example of the procedure for converting the comment data into the format shown in Table 5 using the comment definition table T1 is as follows. First, the first character of each line of comment data is read, and the comment definition table T
Search for key 1 to find lines that match the characters. For example, in the first line of the comment data in Table 3, the first character is P
Therefore, it is identified as a conveyor (CV) by the remarks of the comment definition table T1. here,
Since it is the first conveyor, 1 is added after CV, and the name field of the attribute file F3 is "CV.
1 ”. Further, since the delimiter is ":", it represents speed, and the type is speed "VERO". The numerical value “0.5” following the delimiter “:” becomes the attribute value as it is. In this case, the position information in the attribute file F4 corresponds to the character string from the beginning of each line of the comment data to the delimiter, and the English character is followed by a two-digit number so that the number following the English character becomes two digits. "0" is inserted.

On the other hand, as shown in the fourth line of the comment data in Table 3, when the first character is "M", it is identified as the processing machine (M), and the name is the first found M. To M followed by the ordinal number 1
1 ”. Further, the position is "P02" by using the character string "P2" in the parentheses at the end of the comment data.
Becomes Further, if the delimiter is "=", the type is the processing time "CYC" and the attribute value is the numerical value "15" following the delimiter "=".

By the above processing, the comment data can be converted line by line into the data of the format stored in the attribute file F4, and the above process is repeated until the last line of the comment data. In the evaluation model creation process (step S6), as shown in FIG.
The basic model file F3 and the attribute file F4 are combined on the basis of the node name and the arrow name (step S61) to perform conversion into the evaluation model (step S62). The evaluation model thus obtained is obtained. Is stored in the evaluation model file F5 (step S6).
3). Here, the simulator 3 called "Witness"
Although an example of creating an evaluation model to be input to is shown, other simulators 3 can be handled by almost the same processing.

In order to create an evaluation model to be input to the simulator 3, the following data are required. 1. Name of each function 2. Input / output conditions for each function 3. Processing time for each conversion function 4. Transport time for each transport function In addition, when performing a more advanced evaluation, failure rates for each function and workflow patterns are also required. Item 1 can be known by the item "name" of the attribute file F4, and item 2 can be known by the item "name" of the basic model file F3. Item 3 can be known from the "type" and "attribute value" of the attribute file F4. For item 4, the basic model F3
Based on the “distance” of “No.” and the “type” and “attribute value” of the attribute file F4, it is possible to obtain as distance / attribute value. The format of the data input to the simulator 3 is
(Function name, time, input condition, output condition), the basic model file F3 and the attribute file F4 are used to generate an evaluation model as shown in Table 6.

[0029]

[Table 6]

The evaluation model that can be input to the simulator 3 can be automatically created by the procedure described above. In short, the layout designer of the production line only needs to enter the layout drawing and the comment data, which are conventionally required, and describe the arrow diagram corresponding to each function of the production line.
An evaluation model can be automatically generated, and the evaluation by simulation can be performed quickly after designing the layout. In addition, the arrow diagram shows the start point, end point, and
The layout designer does not need any skill because he or she need only set the nodes corresponding to the positions of the conversion function and the storage function, and show the transportation function that connects the nodes with the arrow in the direction of the work flow. Can be created easily. As a result, the layout creator himself
It is possible to create an evaluation model of a production line, and it is possible to perform evaluation by simulation quickly and easily.

[0031]

As described above, the present invention superimposes and describes an arrow diagram as a process drawing on a layout drawing,
Moreover, the operating conditions of each function corresponding to each node and each arrow in the arrow diagram are set as comment data, and the position information of each function is included in the arrow diagram by duplicating the arrow diagram in the layout drawing. Therefore, there is an advantage that the arrow diagram can be used not only as a process chart but also for evaluation of a layout including position information. Further, since the arrow diagram is widely used, the layout designer is not burdened with the use of the arrow diagram.
In short, compared with the case of using the Petri net code, there is an effect that the layout including the position information of each function can be sufficiently evaluated and the burden on the layout designer is reduced. In addition, since the layout designer can create an evaluation model for simulation himself, there is no miscommunication of information and the reliability of evaluation and analysis is improved compared to the case where an evaluation model is created through another person. There are also advantages.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall procedure of an embodiment.

FIG. 2 is an explanatory diagram showing a procedure for creating a layout drawing and an arrow diagram in the embodiment.

FIG. 3 is an explanatory diagram showing a created state of comment data according to the embodiment.

FIG. 4 is an explanatory diagram showing a procedure of basic model file creation processing in the embodiment.

FIG. 5 is an explanatory diagram showing a procedure of attribute file creation processing in the embodiment.

FIG. 6 is an explanatory diagram showing a procedure of evaluation model creation processing in the embodiment.

[Explanation of symbols]

 1 Evaluation model creation processing unit 2 Layout drawing creation processing unit 3 Simulator

Claims (1)

[Claims] 1. When producing a simulation of a production line based on a layout drawing showing the layout of each function on the production line and the operating conditions of each function, the production for creating an evaluation model for the simulation corresponding to the layout drawing. In the method of creating an evaluation model of a line, after creating a layout drawing, it has nodes with different node names at the positions corresponding to the start point, the end point, the conversion function, and the storage function of the production line. An arrow diagram having arrows corresponding to the transport functions to be combined is overlaid on the layout drawing, and then the operating conditions necessary for creating the evaluation model for the conversion function, storage function, and transport function are set as comment data, In addition, a basic model that associates the arrow name of each arrow with the length of each arrow based on the arrow diagram. Generate an attribute file that associates the function name of each function corresponding to each node and each arrow with the operating condition based on the comment data, and creates the basic model file and the attribute file for each node name and A method for creating an evaluation model for a production line, characterized in that an evaluation model is generated by combining the arrow names.