Production simulation device, production simulation method, and production simulation program

Abstract

To provide a production simulation device and a production simulation method, as well as a production simulation program that can accurately simulate production irrespective of a length of a production period of an estimation target.SOLUTION: A production simulation method that simulates production of a mounting substrate in a component mounting line simulates (ST13-ST15) production of a mounting substrate in the component mounting line on the basis of a relationship (ST11, ST12) between usage count or use time and a mistake rate of a device element possessed by a production device comprised by the component mounting line, and outputs (ST17) a simulation result.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a production simulation device, a production simulation method, and a production simulation program for simulating the production of mounted boards on a component mounting line. [Background technology]

[0002] A known production simulation method for simulating the production capacity of mounted boards in a component mounting line equipped with production equipment is to decompose the work in the production equipment into multiple processes, such as a board transport process and a component mounting process, and estimate the production capacity by taking into consideration the frequency of actual work errors that occur in each process.Patent Document 1 discloses a production simulation device that compares the results of a simulation using a simulation model with production performance information to calculate an error, and performs a simulation by combining a simulation model with a small error. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-82006 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional technologies including Patent Document 1, the same simulation model is used regardless of the length of the production period being simulated, which poses the following problem: The actual frequency of occurrence of work errors and the like fluctuates as the number of times the equipment elements of the production equipment are used increases, but the use of a simulation model that is independent of production time results in poor accuracy of the estimated production capacity in long-term production simulations.

[0005] Therefore, an object of the present invention is to provide a production simulation device, a production simulation method, and a production simulation program that can accurately simulate production regardless of the length of the production period of the estimation target. [Means for solving the problem]

[0006] The production simulation device of the present invention is a production simulation device that simulates the production of mounted boards on a component mounting line, and includes: a simulation unit that simulates the production of mounted boards on the component mounting line based on the relationship between the number of uses or the usage time and the error rate of equipment elements of production equipment equipped on the component mounting line; and an output unit that outputs the results of the simulation.

[0007] The production simulation method of the present invention is a production simulation method for simulating the production of mounted boards on a component mounting line, and simulates the production of mounted boards on the component mounting line based on the relationship between the number of uses or the usage time and the error rate of equipment elements of production equipment equipped on the component mounting line, and outputs the results of the simulation.

[0008] The production simulation program of the present invention is a production simulation program that causes a computer to execute a simulation of the production of mounted boards on a component mounting line, and includes: a simulation step that simulates the production of mounted boards on the component mounting line based on the relationship between the number of uses or the usage time and the error rate of equipment elements of production equipment equipped on the component mounting line; and an output step that outputs the results of the simulation. [Effects of the Invention]

[0009] According to the present invention, production can be simulated with high accuracy regardless of the length of the production period of the estimation target. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating the configuration of a component mounting system according to an embodiment of the present invention. [Figure 2] FIG. 1 is a block diagram showing the configuration of an information processing system of a management computer (production simulation device) according to an embodiment of the present invention. [Figure 3] 1 is a flow diagram of an error rate calculation method according to an embodiment of the present invention; [Figure 4] FIG. 1A is an explanatory diagram of an example of the occurrence frequency of individual error rates, which is created by a management computer (production simulation device) according to an embodiment of the present invention; FIG. 1B is an explanatory diagram showing an example of the relationship between error rates and the number of times of use; [Figure 5] 1 is a flow diagram of a production simulation method according to an embodiment of the present invention; [Figure 6] FIG. 1A is an explanatory diagram showing an example of the relationship between unit production time and produced boards, estimated by (the production simulation device) according to an embodiment of the present invention; FIG. 1B is an explanatory diagram showing an example of the relationship between cumulative production number and production time; DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described in detail below with reference to the drawings. The configurations, shapes, etc. described below are examples for the purpose of explanation and can be modified as appropriate depending on the specifications of the component mounting system, management computer, component mounting line, printing device, component mounting device, etc. In the following, corresponding elements in all drawings will be given the same reference numerals, and duplicated explanations will be omitted.

[0012] First, the configuration of component mounting system 1 will be described with reference to FIG. 1. The component mounting system is configured such that production devices constituting component mounting line L are connected via communication network 2 and managed by management computer 3. Component mounting line L is configured by connecting production devices, such as board supply device M1, printing device M2, print inspection device M3, component mounting devices M4 to M8, mounting inspection device M9, reflow device M10, and board recovery device M11, in series from upstream (left side of the page) to downstream (right side of the page) in the board transport direction. Component mounting line L has the function of producing mounted boards where components are mounted on boards. Note that component mounting line L is a group of production devices connected via communication network 2, and the production devices do not necessarily have to be physically connected to each other.

[0013] 1, board supply device M1 has a storage unit such as a rack that stores multiple boards and performs a board supply operation of removing boards from the storage unit and supplying them to downstream equipment. Printing device M2 is a production device that performs a solder printing operation of printing solder paste onto boards carried in from upstream through a screen mask attached to the printing operation unit.

[0014] The printing device M2 prints solder on the board by bringing the board into contact with a screen mask in which a plurality of openings have been formed, and by moving a squeegee in contact with the screen mask to push the solder supplied onto the screen mask into the openings. When the solder stored in the printing device M2 is consumed during repeated solder printing operations (when solder runs out), the operator performs the solder replenishment work.

[0015] The print inspection device M3 is a production device that performs print inspection work by inspecting the state of solder printed on the board using a print inspection work unit that includes a solder inspection camera and various sensors. The monitoring results of the print inspection device M3, such as the surface state of the board on which the solder has been deposited, are sent to the management computer 3.

[0016] In Figure 1, component mounting devices M4 to M8 are production devices that perform component mounting work by using nozzles attached to their mounting heads to pick up components supplied by component supply devices such as tape feeders and tray feeders and mount them on boards printed with solder. A tape feeder is a component supply device that supplies components by tape-feeding a carrier tape that holds the components. A tray feeder is a component supply device that supplies components by switching trays that hold multiple components. Component mounting devices M4 to M8 are equipped with a component recognition camera that captures images of components held by the nozzles, a sensor that measures the flow rate of air flowing into the nozzles, a head camera that captures images of components supplied by the component supply devices, and the like.

[0017] During component mounting work, component mounting devices M4 to M8 use cameras and various sensors to monitor for mounting errors by the mounting head, suction errors where the nozzle is not properly suctioning components, supply errors where the component supply device is not properly supplying components, etc. The monitoring results are sent to management computer 3.

[0018] In FIG. 1, in component mounting devices M4 to M8, when the components held by the component supply unit are consumed during repeated component mounting operations and fall below a predetermined remaining number (when a component shortage warning occurs), or when the components run out (when a component shortage occurs), the operator performs component replenishment operations (such as replenishing carrier tape or replacing trays).

[0019] Furthermore, if an equipment error occurs that causes component mounting devices M6 to M9 to stop, such as a suction error where the nozzle does not properly pick up components, or an error where the tape feeder stops supplying components due to the carrier tape getting tangled (jamming), an operator will perform work to recover from the equipment error. In this way, the tape feeders, tray feeders, mounting heads, and nozzles that perform component mounting work are equipment elements possessed by component mounting devices M4 to M8 (production devices).

[0020] The component mounting line L is not limited to a configuration with five component mounting devices M4 to M8, and may have one to four, or six or more component mounting devices M4 to M8. The mounting inspection device M9 is a production device that performs mounting inspection work, inspecting the state of components mounted on a board using a mounting inspection work unit that includes a mounting inspection camera. The monitoring results, such as mounting errors where a component is not mounted in a predetermined position on a board inspected by the mounting inspection device M9, are sent to the management computer 3.

[0021] The reflow device M10 performs a board heating operation by using a board heating unit to heat the board carried into the device, hardening the solder on the board and joining the electrodes and components of the board. The board recovery device M11 has a storage unit such as a rack that stores multiple boards, and performs a board recovery operation by receiving boards carried out by an upstream device and recovering them in the storage unit.

[0022] 1, the management computer 3 has the function of creating data and parameters necessary for the operation of the production equipment provided on the component mounting line L and transmitting them to each production equipment. The management computer 3 also has the function of collecting monitoring results and production statuses of the production equipment from the multiple production equipment provided on the component mounting line L, calculating the error rates of the production equipment and equipment elements, and simulating the production of mounted boards. Note that the component mounting system 1 does not need to have one component mounting line L, and may have two or more.

[0023] Next, the configuration of the information processing system of the management computer 3 will be described with reference to Fig. 2. Here, the configuration will be described as a production simulation device that collects production results such as monitoring results and production status from production devices (printing device M2, print inspection device M3, component mounting devices M4 to M8, and mounting inspection device M9), calculates the error rate of device elements, and simulates the production of mounted boards, among multiple functions provided by the management computer 3.

[0024] The management computer 3 includes a processing unit 10, a storage unit 11 which is a storage device, an input unit 12, a display unit 13, and a communication unit 14. The processing unit 10 is a data processing device such as a CPU, and includes, as internal processing units, a performance collection unit 15, an error rate calculation unit 16, a simulation unit 17, a change unit 18, and an output unit 19. The management computer 3 does not have to be configured as a single computer, but may be configured as multiple devices. For example, all or part of the storage unit and processing unit may be provided in the cloud via a server.

[0025] 2, input unit 12 is an input device such as a keyboard, touch panel, or mouse, and is used to input operation commands and data. Display unit 13 is a display device such as a liquid crystal panel, and displays various data stored in memory unit 11, as well as various information such as an operation screen and input screen for operation by input unit 12. Communication unit 14 is a communication interface, and transmits and receives data via communication network 2 to and from production devices (printing device M2, printing inspection device M3, component mounting devices M4 to M8, mounting inspection device M9, etc.) that make up component mounting line L.

[0026] The storage unit 11 stores production plan information 11a, production performance information 11b, equipment element information 11c, error rate information 11d, unit production work information 11e, event information 11f, simulation results 11g, and the like. The production plan information 11a includes information on the mounted boards (board types) scheduled to be produced on the component mounting line L, the number of boards to be produced, the configuration of the production equipment, information identifying the equipment elements of the production equipment, and usage position information. The mounted board information includes the types of components to be mounted on the boards, the mounting positions (XY coordinates), and the like. Furthermore, the information identifying the equipment elements includes the types of components supplied by the tape feeders and tray feeders attached to the component mounting devices M4 to M8, and the like.

[0027] 2, the performance record collection unit 15 periodically collects production performance records from the production devices (printing device M2, component mounting devices M4 to M8, etc.) on the component mounting line L. The production performance records include information such as the production start date and time, production end date and time (the time when the production device produced the mounted boards), the number of sheets produced, the number of times or the duration of use of device elements of the production device (tape feeders, tray feeders, mounting heads, nozzles, etc.), the number of work errors, the error rate (frequency), the number of operational errors and their contents, etc.

[0028] The performance record collection unit 15 associates the collected information with information identifying the production equipment or equipment elements and stores it in the storage unit 11 as production performance information 11b. The equipment element information 11c stores, for each equipment element used in the component mounting line L, information identifying the equipment element, the number of times and duration of use since the most recent maintenance, and the location of use of the equipment element (production equipment and mounting location, storage location, etc.). The performance record collection unit 15 updates the number of times and duration of use of the equipment elements based on the collected production performance of the equipment elements. The error rate calculation unit 16 calculates the relationship between the number of times or duration of use of the equipment elements and the error rate based on the production performance information 11b and equipment element information 11c of the component mounting line L.

[0029] Here, an example of a method for calculating the relationship between the number of times an equipment element is used or the usage time and the error rate by the error rate calculation unit 16 will be described with reference to Fig. 4, following the flow of Fig. 3. Here, a method for calculating the relationship between the number of times an equipment element is used and the error rate will be described using a tape feeder that is attached to and used in component mounting devices M4 to M8 as an example of an equipment element. The calculation method is similar for equipment elements other than tape feeders and for the relationship between an equipment element and usage time, so detailed explanations will be omitted.

[0030] 3, first, the error rate calculation unit 16 calculates, for multiple tape feeders (equipment elements) of the same type, an individual error rate of work errors (such as suction errors and jamming) that occurred in each of multiple tape feeders for each interval of the number of uses (or each interval of use time) based on the production performance information 11b and the equipment element information 11c (ST1: individual error rate calculation step). In the example shown in FIG. 4(a), the individual error rate of tape feeder suction errors is calculated for each interval of 100 uses.

[0031] Specifically, the error rate calculation unit 16 calculates the individual error rate from the actual number of times that a pickup error occurred when the tape feeder supplied components between 1 and 100 times since the most recent maintenance. Similarly, the error rate calculation unit 16 calculates the individual error rate for each tape feeder in increments of 100 uses, such as the individual error rate for the range of 101 to 200 uses and the individual error rate for the range of 201 to 300 uses.

[0032] 3, the error rate calculation unit 16 then calculates the occurrence frequency (probability distribution) of the individual error rate for each interval of the number of uses (or the duration of use) based on the individual error rates calculated for the multiple tape feeders (ST2: probability distribution creation step). That is, the error rate calculation unit 16 calculates the occurrence frequency of the number of tape feeders with the same or similar individual error rate in the interval of the number of uses from 1 to 100. The same applies to the intervals of 101 to 200 and 201 to 300.

[0033] In FIG. 3, the error rate calculation unit 16 then determines a representative value of the individual error rates for each interval (ST3: interval error rate determination step). In this example, the mode of the individual error rates (P(100), P(200), P(300), ...) is used as the representative value of the occurrence frequency (FIG. 4(a)). Note that the representative value is not limited to the mode, and may be the median or average value of the individual error rates for that interval. In other words, the error rate calculation unit 16 uses either the average value, median value, or mode value of the calculated multiple individual error rates as the error rate for that interval of that type of equipment element.

[0034] 4(b) is a graph showing the representative value (mode) of the individual error rate for each interval calculated by error rate calculation unit 16 as a relationship between the error rate and the number of uses. Specifically, error rate calculation unit 16 sets the number of uses in the interval from 1 to 100 times to 100 times as 100 times, and plots the mode (P(100)) of the individual error rate for that interval as the error rate. In this example, the error rate of the tape feeder is statistically processed as a separate set for each component it supplies, and the error rates of component D1 and component D2 are plotted every 500 uses. In other words, even if the tape feeders are the same type, if they supply different components, the error rates are calculated as different sets.

[0035] In FIG. 3, the error rate calculation unit 16 stores the calculated relationship between the number of uses (or usage time) and the error rate as error rate information 11d in the storage unit 11 (ST4: error rate storage step). That is, the storage unit 11 stores the error rate corresponding to the number of uses or usage time of the device element. Note that in the above, the number of uses is divided into intervals of 100 times, but the intervals are not limited to 100 times. For example, it may be every 50 times or every 200 times. In addition, in the case of usage time, for example, the usage time is divided into intervals of 100 seconds, and the relationship with the error rate is calculated.

[0036] 2, the unit production work information 11e stores unit production work time, which is the standard time for each production work (hereinafter referred to as "unit production work") for each mounting operation (mounting step) performed by production equipment or equipment elements of the production equipment in the production work of mounted boards. For example, the unit production work of the printing device M2 includes the operation of transporting the board and the operation of moving the squeegee to print solder on the board. The unit production work of the tape feeder includes the operation of the tape feeder feeding the carrier tape to supply one component. Furthermore, the unit production work of the nozzle includes the operation of the nozzle picking up a component from the component supply device and the operation of mounting the component to the mounting position on the board.

[0037] The event information 11f stores the details of the response work and the event response time, which is the standard work time and recovery time, for each event, such as an operational mistake (error), supply work, or equipment error, that occurs in the production equipment or the equipment elements of the production equipment during production work. For example, in the case of a solder out in the printing device M2, the standard work time for the operator to supply work is stored. In the case of a pickup error in which the nozzle does not properly pick up a component, the standard work time for the nozzle to re-pick up a component from the component supply device is stored. In the case of an error in which the tape feeder stops supplying due to jamming, the standard work time for the operator to recover is stored.

[0038] 2, simulation unit 17 executes a production simulation to estimate the production of mounted boards, such as the production time (unit production time) per board to be produced on component mounting line L and the number of boards to be produced, based on production plan information 11a, equipment element information 11c, error rate information 11d, unit production work information 11e, and event information 11f. Changing unit 18 changes the error rate used in the simulation of an equipment element each time the equipment element is used in the production simulation, based on error rate information 11d. The results of the production simulation are stored in storage unit 11 as simulation results 11g.

[0039] The output unit 19 outputs the simulation results to the display unit 13, another computer, etc. The simulation results that are output may be the time required to produce a set number of pieces, or may be, for example, CPH (Chip Per Hour) as the production capacity of the component mounting devices M4 to M8 or the component mounting line L, or may be the correlation between the number of times of use or the duration of use and the error rate.

[0040] Next, a production simulation method (production simulation program) for simulating the production of mounted boards in component mounting line L will be described along the flow of FIG.

[0041] 5, first, the relationship between the number of times or duration of use of equipment elements of production equipment provided in the component mounting line L and the error rate is calculated (ST11: error rate calculation step). In the error rate calculation step (ST11), the error rate may be calculated based on the latest production performance information 11b of the component mounting line L by the error rate calculation method shown in FIG. 3, or a previously calculated error rate (error rate information 11d) may be referenced.

[0042] The simulation unit 17 simulates production work by the production equipment on the component mounting line L and calculates the production time for each board. Specifically, the simulation unit 17 calculates the unit production work time for each unit production work by the production equipment, and calculates the production time for one mounted board by accumulating the calculated unit production work times. Furthermore, the simulation unit 17 predicts whether an event such as an error will occur for each unit production work based on the probability of the event occurring, and if it predicts that an event will occur, it calculates the production time by adding the event response time corresponding to that event.

[0043] 5, when calculating the production time, first, the change unit 18 changes the error rate based on the number of times or the duration of use at that time for each production device or each device element included in the production device, based on the device element information 11c and the error rate information 11d (ST12: error rate change step). That is, the error rate used in the simulation is changed for each production device or each device element. The changed error rate is stored in the storage unit 11 as the simulation result 11g.

[0044] For example, if the number of uses after the most recent maintenance of a tape feeder that supplies component D1 mounted on component mounting device M4 is 1051, change unit 18 changes the error rate of that tape feeder based on the error rate included in error rate information 11d. At that time, if error rate information 11d does not contain an error rate corresponding to 1051, change unit 18 does not change the error rate of that tape feeder stored in simulation result 11g.

[0045] That is, the error rate of the tape feeder is not changed from the error rate in the interval from 901 to 1000 times, which is stored in error rate information 11d assuming that the number of uses is 1000. In this way, when there is no error rate corresponding to the first number of uses (here, 1051 times) (or the first usage time) of the equipment element, change unit 18 does not change the error rate used in the production simulation from the error rate corresponding to the first number of uses (or the first usage time) (here, the error rate in the interval from 901 to 1000 times). In this way, change unit 18 refers to storage unit 11 and changes the error rate used in the production simulation to the error rate corresponding to the number of uses or usage time of the equipment element.

[0046] 5, the simulation unit 17 then calculates the unit production work time of the unit production work of the production equipment or the equipment elements provided in the production equipment based on the unit production work information 11e (ST13: unit production work time calculation step). At that time, the simulation unit 17 predicts whether or not an event will occur based on the error rate of the production equipment or the equipment elements changed in the error rate change step (ST12). If the simulation unit 17 predicts that an event will occur, it adds the event response time corresponding to the event predicted to occur to the work time. The calculated unit production work time and event response time are stored in the simulation result 11g.

[0047] For example, if the simulation unit 17 predicts that an event of an adsorption error in which the component D1 cannot be adsorbed will occur in a unit production task in which a nozzle picks up the component D1 from a tape feeder attached to the component mounting device M4, the simulation result 11g will store the unit production task time of the unit production task in which the nozzle picks up the component from the component supply device, as well as the event response time of the task in which the nozzle re-adsorbs the component D1 from the tape feeder.

[0048] 5, the simulation unit 17 then determines whether any unit production work remains for that board (ST14). If any unit production work remains (No in ST14), the process returns to the error rate change step (ST12), where the error rate is changed based on the number of uses (or usage time), and the unit production work time calculation step (ST13) is executed based on the changed error rate. When the unit production work for that board is completed (Yes in ST14), the simulation unit 17 adds the unit production work time and the event response time stored in the simulation result 11g to calculate the production time for that board, and stores the result in the simulation result 11g.

[0049] Next, if the production simulation of the mounted board to be produced has not finished (No in ST16), the process returns to the error rate changing step (ST12) and a simulation is executed for the next board. When the production simulation of the mounted board to be produced has finished (Yes in ST16), the output unit 19 displays (outputs) the simulation results on the display unit 13 or the like (ST17: output step). As described above, the production simulation method of this embodiment simulates the production of mounted boards in the component mounting line L (ST13 to ST15) based on the relationship between the error rate and the number of times or usage time of equipment elements of the production equipment provided in the component mounting line L (ST11, ST12), and outputs the simulation results (ST17).

[0050] Next, an example of the results of a production simulation will be described with reference to FIG. 6. FIG. 6(a) shows the relationship between the unit production time required to produce one mounted board and the boards produced. FIG. 6(b) shows the relationship between the cumulative number of mounted boards produced and the production time. The solid lines shown in the graphs of FIGS. 6(a) and 6(b) show the results of a production simulation of this embodiment in which the error rate is changed depending on the number of times or the length of time an equipment element is used. The dotted lines shown in the graphs show the results of a conventional production simulation calculated using an error rate that is not dependent on the number of times or the length of time an equipment element is used.

[0051] In conventional production simulations, the unit production time is constant and does not depend on the number of boards produced, and the cumulative number of boards produced increases monotonically in proportion to the production time. On the other hand, in the production simulation of this embodiment, the occurrence of an event is estimated using the relationship between the number of times or usage time of equipment elements based on production performance information 11b and the error rate (see FIG. 4(b)). Therefore, the unit production time increases or decreases depending on the events expected to occur during the production work of the mounted board.

[0052] As the production period (production volume) becomes longer and the number of times or duration of use of production equipment and equipment elements increases, deterioration due to distortion and fatigue of the production equipment and equipment elements increases, leading to an increase in the error rate. Conventional production simulations estimate production with a constant error rate, which can result in underestimating production time in long-term predictions and overestimating production time in short-term predictions. In contrast, the production simulation of this embodiment predicts (models) changes in error rate based on production performance, allowing for accurate estimation of production time in accordance with fluctuations in the actual error rate. This allows for accurate production simulation regardless of the length of the production period (production volume) being estimated.

[0053] As described above, management computer 3 of this embodiment is a production simulation device that includes simulation unit 17 that simulates the production of mounted boards on component mounting line L based on the relationship between the number of uses or usage time and error rate of equipment elements (tape feeders) of production devices (component mounting devices M4 to M8) equipped on component mounting line L, and output unit 19 that outputs the results of the simulation, and simulates the production of mounted boards on component mounting line L. This makes it possible to simulate production with high accuracy regardless of the length of the production period (number of boards produced) to be estimated. [Industrial Applicability]

[0054] The production simulation device, production simulation method, and production simulation program of the present invention have the effect of being able to accurately simulate production regardless of the length of the production period to be estimated, and are useful in the field of mounting components on a board. [Explanation of symbols]

[0055] 3. Management computer (production simulation device) L Component Mounting Line M2 Printing Device (Production Device) M4~M8 component mounting equipment (production equipment)

Claims

1. A production simulation device that simulates the production of mounted boards in a component mounting line, comprising: a simulation unit that simulates the production of mounted boards in the component mounting line based on the relationship between the number of uses or the duration of use and the error rate of equipment elements of production equipment provided in the component mounting line; an output unit that outputs the results of the simulation.

2. further comprising a change unit for changing the miss rate used in the simulation, 2. The production simulation device according to claim 1, wherein the change unit changes the error rate each time the equipment element is used in the simulation.

3. 3. The production simulation device according to claim 2, wherein the change unit does not change the error rate used in the simulation from the error rate corresponding to the first number of uses or the first usage time when there is no error rate corresponding to the first number of uses or the first usage time of the equipment element.

4. Further, a storage unit is provided for storing the error rate corresponding to the number of times of use or the duration of use of the device element, 4. The production simulation device according to claim 2, wherein the change unit changes the error rate used in the simulation to the error rate corresponding to the number of uses or the usage time of the equipment element by referring to the storage unit.

5. 5. The production simulation device according to claim 1, further comprising: an error rate calculation unit that calculates a relationship between the number of uses or the usage time of the equipment element and the error rate based on production performance information of the component mounting line.

6. The error rate calculation unit For a plurality of the device elements of the same type, an individual error rate of errors occurring in each of the plurality of device elements is calculated for each interval of the number of times of use or for each interval of the use time; 6. The production simulation device according to claim 5, wherein one of an average value, a median value, and a mode value of the calculated individual error rates is adopted as the error rate of the equipment element of the type in question for the section in question.

7. 1. A production simulation method for simulating the production of mounted boards in a component mounting line, comprising: simulating the production of mounted boards in the component mounting line based on the relationship between the number of uses or the duration of use of equipment elements of production equipment provided in the component mounting line and the error rate; A production simulation method that outputs the results of the simulation.

8. A production simulation program that causes a computer to execute a simulation of the production of mounted boards in a component mounting line, a simulation step of simulating the production of mounted boards in the component mounting line based on the relationship between the number of uses or the usage time of equipment elements of production equipment provided in the component mounting line and the error rate; and an output step of outputting the results of the simulation.

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