JPH0283146A - Modeling method for simulation - Google Patents

Abstract

PURPOSE:To perform the simulation of a designed work machine system and transfer system immediately and easily even by the first person in operation by preparing the models of the work machine system and transfer system by combining Petri net signs. CONSTITUTION:A machine system forms a regulation line regulating the inputs to the work line setting a work time by the combination of Petri net symbols (source, place P, sink, transition, etc.) and to the trouble generation line setting a trouble generation rate and to the work line of the body to be worked according to the work state of this work line, and a transfer system forms the call line performing the calling for transfer at least by combining the symbols and the moving time set line setting the moving time of the transfer returning to a standby position again by passing a target position from the standby position. The quantity (m) of the body to be worked fed from this machine system or transfer system is counted by a link system and at the time when this count value reaches the specified number an operation command is given to the linked succeeding machine system or transfer system.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a simulation modeling method suitable for simulating a production system, etc. consisting of automatic and manual mechanical systems and transport systems. Regarding.

(Prior art) For example, in the processing process of a workpiece in a production system,
After the workpiece enters this process, it undergoes predetermined processing, and is then sent to the next process as a workpiece. Therefore, when designing such a machining process, by simulating the machining process and knowing the number of machining processes and operating conditions over time, it is possible to judge and evaluate which parts of the machining process are insufficient. Conventionally, simulations for production systems and the like have been performed using general high-level languages or simulation languages such as GPSS (General Purpose System Simulator). However, in order to use CPS5, one must first learn the language and how to operate the machine. However, this language is extremely difficult, and it is also difficult to operate the machine, so it takes at least a month to run a simulation without any problems.

Therefore, if an operator is familiar with GPSS operations, it can be simulated immediately, but cps5
The reality is that even if a person who does not know how to operate the system tries to perform a simulation, he or she cannot do it immediately.

On the other hand, in system design, there is a demand for immediate knowledge of simulation results, and the reality is that system design does not proceed as planned.

(Problems to be Solved by the Invention) As described above, simulations for conventional systems can only be performed by an operator who is familiar with the operation of CPS5, and there is a need for something that can be simulated quickly and easily even by a first-time operator. ing.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a simulation modeling method that allows even a first-time operator to perform simulation immediately and accurately.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a simulation method for modeling a production system when simulating a production system composed of either a mechanical system or a conveyance system, or both. In the modeling method, the mechanical system combines Vetrinet codes to at least calculate the processing line for setting the processing time, the failure occurrence line for setting the failure rate, and the human power for the processing line for the workpiece, based on the working status of this processing line. A control line is formed to regulate the transport system accordingly, and the transport system combines VetriNet codes to at least call a call line for transport, and a movement to set the travel time for transport from the standby position through the Ll mark position and back to the standby position. A time setting line is formed, and between the mechanical system and the conveyance system, or between these mechanical systems and conveyance systems, at least the quantity of workpieces sent from the mechanical system or the conveyance system is counted, and this count value is a predetermined number. A connection system is provided that gives an operation command to the next connected mechanical system or conveyance system when the next mechanical system or transport system is reached.

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

Figure 1 is a functional flowchart in which the processing machine system shown in Figure 2 is modeled using Vetrinet codes, and Figure 3 is a functional flowchart in which the conveyance system shown in Figure 4 is modeled using Vetrinet codes. .

Before explaining the functional flowcharts of these processing machine systems and conveyance systems, the symbols of the u elements of the Vetri net will be explained with reference to Figure 5. A code is written. Here, the source is, for example, the occurrence of a token (stone) or rlJr that the workpiece has been transported.
It has a function shown as OJ, a place has conditions such as processing time, and a sink has a function of extinguishing a token. Therefore, each function can be expressed by combining these Vetrinet codes. For example, when two places are connected to one place through one transition as shown in FIG. 6, it has the same function as an AND gate. In other words, Fig. 6 (
When the conditions in the two places shown in a) are satisfied and 1-kun "・" is entered in both places, the token moves due to the operation of the transition and becomes as shown in Figure 6 (b). .

Next, a functional flowchart of the processing machine system will be explained. In FIG. 1, source T1, place P1, transition T2, place P2, transition T3,
The machining total number side m represents the addition line. In this processing machine system, the workpiece arrives at 20'±2', so the source T1 generates tokens at 20'±2'. Also, source T4 is connected to transition T2 via place P3, and source T4 is connected to transition T2 via place P3.
generates a token at the same time as every processing step 20', that is, at every time according to the regular numerator 11 of 20'. Further, a place d1 is connected between transitions T2 and T3, which has a function of delaying the human power of the token depending on the processing time. Further, place P4 is connected so as to feed back from transition T3 to T2. On the other hand, transitions T2 and T
5 and a place P5 to which tokens can be moved are provided, and a place P6 that receives a token from a source T6 that generates a token every time corresponding to a failure rate of 1/1000 is connected to the transition T5. A place d2 having a function of delaying the human power of the token by a time corresponding to the failure stop time 60' is connected to this transition T5. And this place d2
is fed back to place P5 via transition T7. Note that place P5 is connected to the input of transition T3, and outputs of transitions T2 and T3 are connected to place P5. Note that the functional flowchart of the processing machine system may be represented by simplifying two parts as shown in FIG.

Next, a functional flowchart of the conveyance system will be explained. As shown in FIG.
．． It is possible to move to 13.14, and steps 11 to 14
The structure is such that when there are no more articles left, the transport vehicle 10 is called to transport the articles. Now, the functional flowchart of this conveyance system is shown in the first part.
The result is as shown in Figure 2. Note that the method for determining the functional flowchart is the same as that for the processing machine system described above. Source T10. Place PIO,) Transition T11. Place pH,)
Transition T12 represents conveyance of the article. Also, there is a place d between transitions T11 and T12.
lO is connected, and this place dlO has a place dl
l is connected. The place dlO has the function of delaying the human power of the token "・" by the time the transport vehicle 10 moves from the standby position 15 to the steps 11 to 14, and the place dll has the function of delaying the human power of the token "・" by the time the transport vehicle 10 moves from the standby position 15 to the steps 11 to 14.
It has the function of delaying the human power of the token "・" by the travel time up to 5. Note that, regardless of which process 11 to 14 calls the transport vehicle 10, the travel time of the transport vehicle 10 is the same. and place dl
l is fed back from transition T13 to transition Tll via place Pt2.

Note that the second functional flowchart may have a configuration as shown in FIG.

If a model of a processing machine system or a conveyance system is created using Vetrinet codes as described above, the designed processing machine system or conveyance system can be simulated quickly and easily even if the user is new to operation. In other words, if it is a processing machine system, for example, it is sufficient to set the arrival time of the wave-processed object, processing time, failure rate, stop time due to failure, etc., and if it is a conveyance system, it is sufficient to set the travel time for conveyance, etc. Just do it.

Next, a simulation using the functional flowcharts of the processing machine system and the conveyance system will be described.

FIG. 9 is a block diagram of a system simulation device, and FIG. 10 is a functional block diagram thereof.

This apparatus has a CPU (central processing unit) 1 connected to a keyboard 2, a program storage means 3, a Vetrinet code storage means 4, a printer 5, and a CRT'& display (cathode ray tube display) 6.

The program storage means 3 stores a program according to the system simulation flowchart shown in FIG. 11, and is composed of, for example, a floppy disk and a reading device for the floppy disk. In addition, the VetriNet code storage means 4 stores information such as VetriNet codes for representing various functions of processing equipment, etc. in the production system, such as operating conditions and events such as machining time, failure rate, and failure stop time. It is something. The CPU 1 has each function shown in the functional blocks of FIG. 10 according to the system simulation flowchart shown in FIG. 11.

In other words, the flowchart converting means 1-1 converts the entire function of the production system according to each functional element signal of the production system etc. inputted from the keyboard 2, and combines the six
The simulation execution means 1-2 has a function of converting the function flowchart into a function flowchart as shown in the figure, etc., and the simulation execution means 1-2 has the function of operating the function flowchart according to the function element signal indicated by the Vetrinet code and executing the simulation of the production system. In addition, system evaluation means 1-
3 is the evaluation of the system obtained by simulation,
For example, it has a function of determining the number of processes and operation rate over time.

Next, a simulation of a processing machine system using the apparatus configured as described above will be explained.

In step s1 of the system simulation flowchart shown in FIG. 11, when the functional element signals of the processing machine system, such as machining time and failure rate, are entered manually from the keyboard 2, these functional element signals are recorded in the memory in CPυ1, and step S3 At this point, the functional flowchart shown in FIG. 1 is read out from the Betrinet code storage means 4. This functional flowchart is then displayed on the display screen of the CRT display device 6 in response to the addition of each functional element signal. Na°
The functional flowchart of the processing machine system shown in FIG. 2 is created by manually inputting each Vetrinet code instruction from the keyboard 2 and displaying it on the CRT display 6 while combining the Vetrinet codes. data may be stored in the Betrinet code storage means 4. When the function flowchart is displayed in this way, the process moves to the next step S5 and a simulation is executed according to the simulation flowchart shown in FIG. In step e1, the initial conditions, that is, under what conditions the processing machine system starts operating, specifically, the next step e2
Tokens are placed in places P1, P3, P4, and P5.
・" is inserted. In other words, the CRT display device 6 has the 13th A
The function flowchart will be as shown in the figure. In this state, transition T2 is activated and the token "・" can be moved, and in step e3, the token "・" is transferred to Betrinet P2. Move immediately to P5. However, Betrinet d1 requires manual labor for the token "." with a delay of processing time. Therefore, in step e4, it is determined whether the machining time has elapsed, and when this machining time has elapsed, the first
The function flowchart changes to the one shown in Figure 3B. In this state, transition T3 is activated in step e5, and the token "・" can be moved to place P.
4. Move to P5, and the function flowchart becomes as shown in FIG. 13C. Therefore, one workpiece is created, and its number is displayed as "1" in the total number of workpieces column m.

Next, in step e6, the processing machine system is evaluated. Note that this evaluation calculates the number of processes and operation rate over time. Now, for source T6, the failure rate is 100.
Since the token "・" is generated according to the probability of 1/0, the token "・" is generated at the place P6 in step e7.
” is entered, and the token “・” is placed at the place P.
If it enters 6, move to step e8 and insert the token "・"
Move to place d2. Here, in place d2, the human power of the token "・" is delayed by the stoppage time due to a failure, so when the token "・" enters the place d2 after this stoppage time has elapsed, the token "・" enters the place P5 again and this After that, a system evaluation is required again. At this time, the function flowchart is the same as in Fig. 13C, and it moves to Stellar e7 again to determine whether the token "." has entered place P6. If the token "." has not entered, it moves from step all to e12. Place the token at place P3.
・" is inserted. Then, a token "." is generated every 20'±2' when the wave workpiece is transported from the source TI and enters the place P1. Then, the 13th A again
The function flowchart is the same as that shown in the figure, and the process moves to the smartphone e3 to execute the above operations again. In this way, the total number of workpieces over time is displayed, and the operating rate thereof is determined.

Next, the simulation operation of this conveyance system will be explained using the function flowchart of FIG. 3 and the simulation flowchart shown in FIG. 14.

In step f1, a token is placed in the initial condition, that is, place P12. A state in which a token is placed in this place P12 indicates that an article is missing in any of steps 11 to 14. Therefore, when the token "." is generated from the source T10 in response to the call of the transport vehicle, the token "." enters the place PIO and the transition Tll is activated to move the token ".J" to the places pH and dlO. Here, the transport vehicle 10 is in steps 11-1.
The human power of the token "・" is delayed to the place dlO by the time of arrival at the place dlO, and when the token "・" enters the place dlo according to the judgment in step f14, the transition T12 is activated in step f5 to transport the token "・". Move to the total number column sa and move to the place dll.

This means that the article has been transported to steps 11-14. Then, in the place dll, the transport vehicle 10 is the process 11.
Token "・" for the time to return from ~14 to standby position 15
is delayed, and the token “
・” enters the place dll, transition T13
is activated and moves the token "." to place P2.

Thus, one cycle of article conveyance is completed.

As described above, by configuring the simulation to be performed using a function flowchart that combines VetriNet codes, it is possible to immediately convert it into a function flowchart for a mechanical system or conveyance system by simply memorizing the few types of VetriNet codes. You can easily simulate a designed mechanical system or transport system by manually inputting each functional element signal of the transport system. Then, by storing the converted function flowchart in the Vetrinet code storage means 4, it is possible to instantly convert it into a function flowchart for these systems and into a product by simply keying the functional element signals of the mechanical system and transport system. Furthermore, a system that combines a mechanical system and a transport system can be simulated instantly and easily. Then, from the simulation results, we can evaluate the system, such as the number of processed products produced, the operating rate of the mechanical system and transport system, and the parts of the system that are defective. It can be improved.

Next, a case where each mechanical system is connected will be explained.

FIG. 15 is a block diagram of a batch production system, and this system 1 is composed of first and second continuously operating machines 20 and 21. These machines 20.21 are operated when the number of manual works reaches a predetermined value, and are provided with batch output codes 22.23. Now, the functional flowchart of such a system is as shown in FIG. That is, the first and second continuously operating machines 20.degree. 21 have the same configuration as in FIG. 7 and are represented by the Vetrinet code as 24.25. Also, the batch output functions as a connection system and has a capacity CI.

Represented as C2 and C3. Here, capacity C
1 to C3 have a batch function in which, for example, the token "・" is input 8 times (when 8 workpieces are transported, the token "・" is generated and output. It is omitted in Figure 15.

However, if a simulation is performed using such a functional flowchart of the Ha configuration, for example, the first continuous operation machine 20 will sequentially send out the workpieces and manually input them to the capacity C2.
When the count value of this capacity C2 becomes "8", a token "." is sent from this capacity C2 to the second continuous operation machine 21. This second continuous operation machine 21 starts operating upon receiving the token ".". Therefore, the batch production system shown in FIG. 15 can be evaluated from the counted values of each capacity 01 to C3.

Next, a case where the method is applied to other systems will be explained. Fig. 17 shows a system consisting of a transport system with two transport vehicles 26 and 27 and a seven-stroke mechanical system 28 to 34, and the functional flowchart of this system is as shown in Fig. 18. . In other words, the functional flowchart of article conveyance by the conveyor vehicle 26°27 is shown by Ql and Q2 having the same configuration as in FIG.
Each process 28 to 34 is performed by W1 to W7 having the same configuration as in Fig. 7.
A functional flowchart of the entire system is shown.

In this way, a system that includes a plurality of mechanical systems and transport systems, and is configured by combining these systems, can be easily converted into a functional flowchart, and its simulation can be executed immediately.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a simulation modeling method that allows even first-time users to perform simulation immediately and accurately.

[Brief explanation of the drawing]

1 to 4 are diagrams for explaining one embodiment of the simulation modeling method of the present invention, in which FIG. 1 is a functional flowchart of a processing machine system, and FIG. 2 is a schematic diagram of the processing machine system. , Fig. 3 is a functional flowchart of the transport system, Fig. 4 is a schematic diagram showing the configuration of the transport system, Figs. 5 and 6 are explanatory diagrams of the action of Vetrinet, and Figs. Figures 9 and 10 are system simulations applying the functional flowcharts of Vetrinet codes, Figures 11 and 11 are the configuration diagrams of the S-N device, and Figures 13A to 125 are simulation flowcharts of the machine. Fig. 13c is a diagram showing the simulation progress of the processing machine system, Fig. 14
15 and 16 are diagrams for explaining the case where mechanical systems are connected, and FIGS. 17 and 18 are functional flowcharts when applied to other systems. 1...CPU, t-1...Flow chart conversion means, 1-2
...Simulation execution means, 1-3...System evaluation means, 2...Keyboard, 3...1 stage of program storage, 4...Betrinet? ]No. storage means, 5.
...Printer, 6...CRT display device. Applicant's Representative Patent Attorney Takehiko Suzue Figure 3 Figure 1 Figure 4 Figure 5 Figure 2 (a) (b) Figure Figure Figure Figure Figure Figure 13C Figure

Claims (1)

[Claims] In a simulation modeling method for modeling a production system when simulating a production system consisting of one or both of a mechanical system and a conveyance system, the mechanical system sets at least a machining time by combining Vetrinet codes. A processing line is formed to control the processing line, a failure occurrence line is used to set the failure rate, and a regulation line is formed to regulate the input of workpieces to the processing line according to the working status of the processing line, and the conveyance system uses the Vetrinet code. In combination, at least a call line for calling transport, and a movement time setting line for setting the travel time for transport from a standby position through a target position and back to the standby position are formed, and At least between the mechanical system and the conveyance system, the quantity of the workpieces sent from the mechanical system or the conveyance system is counted, and when this count reaches a predetermined number, the next connected A simulation modeling method characterized by arranging a connection system for giving operation commands to a mechanical system or the transport system.