JP3921525B2 - Mounting time simulation method for component mounting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention simulates the time required to mount an electronic component in a component mounting apparatus that takes out the electronic component from a storage unit in which an electronic component to be mounted on a printed circuit board or the like is stored in advance and mounts the electronic component on the substrate. Regarding the method. In particular, the present invention provides a multi-component component mounting apparatus having two heads, specifically, a component mounting apparatus in which the head operates on the XY axes, and further includes two heads, and further, one head includes a plurality of nozzles. The present invention relates to a method for simulating the time required to mount an electronic component.
[0002]
[Prior art]
A component mounting apparatus (hereinafter referred to as a mounter) for mounting an electronic component on a printed circuit board with one head has already been widely put into practical use, and various techniques have been developed for component placement methods and the like. However, as for the mounter having two heads, since the history of such a device itself is short, not much research has been done.
[0003]
[Problems to be solved by the invention]
In a conventional one-head mounter, how efficiently a component is mounted on a board by one head, specifically the position where each component is kept on standby, the movement path of the head, etc. are important. For example, Japanese Patent Laid-Open No. 2000-244189 discloses an invention with such a device.
[0004]
However, in a two-head mounter, components are taken out simultaneously with two heads and mounted on the board. In this case, it is important to perform pairing, that is, in what combination the components are taken out with two heads. Become a factor. Hereinafter, how the parts are paired is referred to as a pairing parameter.
[0005]
Conventionally, as a technique for optimizing the pairing parameters in a two-head mounter, either a full search for trying all combinations or a distribution based on expert know-how is generally used. It was done. However, when performing a full search, since the total number of combinations becomes enormous, there is a problem that a solution cannot be obtained in a realistic time. In addition, there is a problem that the method of assigning by the expert needs to be handled every time the type of board changes, and there is a problem that it is not efficient, and whether the pairing parameter determined by the expert is really optimal or not There was also a problem that could not be proved.
[0006]
The present invention has been made in view of the circumstances as described above. In order to optimize the pairing parameters in the two-head mounter, an apparently unnecessary solution space is specified and its portion is excluded, and the remaining parts are excluded. An object of the present invention is to provide a mounting time simulation method for a component mounting apparatus that performs a more efficient search than a full search by performing a full search only for a solution space. For this purpose, in view of the structure of the target mounter, in order to optimize the pairing parameters, as much as possible simultaneous adsorption, specifically not to move the beam equipped with two heads It is important to make it.
[0007]
Based on the above, when selecting the pairing parameters to be searched, a judgment index for realizing simultaneous adsorption is introduced, and only a combination of pairing parameters that can achieve almost simultaneous adsorption is evaluated. The optimum value of the pairing parameter is searched more efficiently than in the case of performing.
[0008]
Here, as the determination index, the simultaneous adsorption rate is set in a range of 90% to 100%, for example. The reason why it is not set to 100% is that it is necessary to perform a search when there are non-simultaneous suction parts of several percent.
[0009]
[Means for Solving the Problems]
A mounting time simulation method for a component mounting apparatus according to the present invention includes a second direction that intersects the first direction on a moving member that moves in a first direction from a plurality of component storage units each storing a component. In the method of simulating the mounting time of a component mounting apparatus that takes out a component by two heads that can be moved independently of each other and mounts the component on a substrate set at a predetermined position, the component storage unit includes the first storage unit. Arranged in the second direction on one side of the first direction, and arranged in the second direction on the other side of the first direction, and one of the first directions of the two heads. It is characterized in that the mounting time is simulated only for the combination in which the components can be simultaneously taken out from the component storage section only by moving in the second direction on either the side or the other side .
[0010]
In such a mounting time simulation method in the component mounting apparatus of the present invention, only a combination in which each of the two heads can be taken out from the component storage unit at the same time only by moving the two heads in the second direction is relatively carried. In other words, the mounting time is simulated.
[0011]
In the mounting time simulation method in the component mounting apparatus according to the present invention, the total number of components that can be taken out from the component storage unit at the same time is odd when the total number of components is an even number, whereas the total number of components is an odd number. In some cases, the mounting time is simulated when the maximum integer that does not exceed ½ is within a predetermined range.
[0012]
In such a mounting time simulation method in the component mounting apparatus according to the present invention, in the above-described invention, the number of combinations of components that can be simultaneously taken out from the component storage unit is ½ of the total number of components. When the total number of parts is an odd number, since the simulation of the mounting time is performed for the maximum integer that does not exceed 1/2 of the total number, the other combinations are excluded from the simulation.
[0013]
Furthermore, the mounting time simulation method in the component mounting apparatus according to the present invention is characterized in that, in the above-described invention, the predetermined range is 90% to 100%.
[0014]
In such a mounting time simulation method in the component mounting apparatus according to the present invention, in the above-described invention, the predetermined combination is set to 90% to 100%, and other combinations are excluded from the simulation.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
[0016]
FIG. 1 is a schematic diagram showing a configuration and an operating state of a two-head component mounting apparatus (mounter) to which a mounting time simulation method for a component mounting apparatus according to the present invention is applied.
[0017]
The substrate 1 has been transferred by a transfer device (not shown) and set at a predetermined position. When the substrate 1 is set at a predetermined position, a pair of rails 41 and 42 are arranged in parallel at appropriate positions (on the left and right sides in FIG. 1) on the outer sides of the two opposite sides of the substrate 1. The extending direction of the rails 41 and 42 is hereinafter referred to as a Y direction.
[0018]
A rod-like beam 5 as a moving member is laid across the rails 41 and 42. The beam 5 can move in the extending direction (Y direction) of the rails 41 and 42 while maintaining the orthogonal state with respect to the rails 41 and 42. Hereinafter, the extending direction of the beam 5 (direction perpendicular to the Y direction) is defined as the X direction.
[0019]
Further, two heads 61 and 62 are mounted on the beam 5 so as to be individually movable in the longitudinal direction of the beam 5. Needless to say, both heads 61 and 62 can move independently on the beam 5, but they cannot approach each other more than a certain extent.
[0020]
Furthermore, electronic components to be mounted on the board 1 are stored in advance at appropriate positions inside the positions where the rails 41 and 42 on both sides in the Y direction are located near the position where the board 1 is set. The feeders 71, 72, 73, 74 are arranged. Of these feeders 71, 72, 73, 74, two of them (71, 72) are arranged in the X direction on one side in the Y direction of the set position of the substrate 1, and the other two ( 73, 74) are arranged in the X direction on the other side.
[0021]
Therefore, both heads 61 and 62 are provided with rails 41 and 42 by a combination of movement in the X direction on the respective beams 5 and movement in the Y direction on the rails 41 and 42 of the beams 5. Needless to say, the feeders 71, 72, 73, and 74 are disposed within the movable range of the heads 61 and 62.
[0022]
With the configuration as described above, the heads 61 and 62 can suck and take out components from any of the feeders 71, 72, 73, and 74, and can mount them on the substrate 1. However, since it is clear that the two heads 61 and 62 cannot approach each other more than a certain extent, there is a restriction on taking out parts from the same feeder 71 (or 72, 73, 74) at the same time.
[0023]
In the two-head mounter configured as described above, the mounting time simulation method for the component mounting apparatus of the present invention for optimizing the mounting time of the components by the two heads 61 and 62 is implemented. explain.
[0024]
First, in order to implement a mounting time simulation method for a component mounting apparatus according to the present invention (hereinafter referred to as a method according to the present invention), the following constraints are set in advance before the method according to the present invention is performed. The first is a nozzle arrangement parameter of the heads 61 and 62, the second is a feeder arrangement parameter, and the third is a mounting head parameter. Specifically, the nozzle arrangement parameter is to optimize the arrangement state of a plurality of nozzles provided in both heads 61 and 62, and the feeder arrangement parameter is a component to each of the feeders 71, 72, 73, and 74. The mounting head parameter is to optimize the assignment of both heads 61 and 62 to each of the feeders 71, 72, 73, and 74.
[0025]
The method of the present invention provides a simulation method for obtaining an optimal solution for pairing by both heads 61 and 62 on the assumption that the above-described three types of parameters have already been determined. Hereinafter, the procedure of the method of the present invention will be described with reference to the flowchart of FIG.
[0026]
First, combinations of pairing parameters are arbitrarily selected one by one, for example, by a simple permutation combination according to the component arrangement order (step S11). Then, the simultaneous adsorption rate is calculated for each combination of the arbitrarily selected pairing parameters (step S12).
[0027]
Specifically, it is determined whether the combination is a valid pairing parameter or an invalid pairing parameter according to the following determination index for the various combinations of the pairing parameters selected in step S11. Is done. The determination index is “simultaneous adsorption rate”, and the validity / invalidity of the pairing parameter is determined based on whether or not the simultaneous adsorption rate is equal to or higher than a predetermined value TH (for example, 90%).
[0028]
Here, the simultaneous adsorption rate will be described. First, “simultaneous adsorption” means that two parts are adsorbed only by moving both heads 61 and 62 without moving the beam 5. Specifically, in a state where the beam 5 is positioned and stopped on the feeders 71 and 72 on one side or the feeders 73 and 74 on the other side, both the heads 61 and 62 are individually moved to feed the feeder 71. , 72 or from both or one of the feeders 73, 74, the heads 61, 62 respectively adsorb components.
[0029]
Next, the simultaneous suction rate is the ratio of “the number of pairings that can be picked up simultaneously” to the “total number of parts pairing”. For example, “total number of parts pairing” is “20/2” = “10” if the total number of parts is “20”, and “pairing number that can be picked up simultaneously” is “10”. The simultaneous adsorption rate is 100% at “10/10”.
[0030]
However, for example, when the total number of parts is “21”, the “total part pairing number” is “21/2” = “10.5”. Is “10”.
[0031]
Here, the reason for setting the simultaneous adsorption rate in the range of 90% to 100% instead of 100% is that there are actually some special parts that cannot be simultaneously adsorbed of about several percent. This is because it is necessary to perform a search in consideration of the necessity in such a case.
[0032]
When the above condition, that is, the condition that the simultaneous adsorption rate is equal to or greater than a predetermined value TH (for example, 90%) is satisfied, the combination of the pairing parameters is validated (YES in step S13). If it is determined to be invalid (NO in step S13), the process returns to step S11, the next pairing parameter combination is selected, and the validity / invalidity is determined in the same manner as described above.
[0033]
For the combination of the pairing parameters determined to be valid in step S13, the mounting time is calculated by simulating the mounting operation. Specifically, the mounting order and the pair mounting order are optimized (step S14), and the mounting operation is calculated by simulating the component mounting work according to the result (step S15).
[0034]
As described above, in step S13, all the mounting simulations are performed only for the combinations of the pairing parameters determined to be effective according to the “simultaneous adsorption rate” as the determination index, the mounting time is calculated, and all the combinations are calculated. When the search is completed (YES in step S16), the process ends.
[0035]
Next, an actual application example of the method of the present invention as described above will be described with reference to the schematic diagram of FIG. In FIG. 3, the rails 41 and 42 are omitted.
[0036]
In the example of the schematic diagram shown in FIG. 3, each of the feeders 71, 72, 73, 74 stores parts in three rows. The total number of parts is 26. As described above, the feeder parameters (arrangement), the mounting head parameters (head arrangement), and the like have already been determined, and the parts are assigned to the feeders 71, 72, 73, 74 according to them. Is stored, and it is already determined which head 61 or 62 is to suck these parts.
[0037]
The feeder 71 has two components α1 and α2 in the first column C1, two components α3 and α4 in the second column C2, and one component α5 in the third column C3. It is already determined by the mounting head parameter that the heads 61 (H1) are attracted to each other.
[0038]
The feeder 72 has two parts β1 and β2 in the first column C1, two parts β3 and β4 in the second column C2, and one part β5 in the third column C3. It is stored on the side close to the substrate 1, and it is already determined by the mounting head parameters that both are attracted by the head 62 (H2).
[0039]
Furthermore, the feeder 73 has four parts γ1, γ2, γ2, and γ4 in the first row C1, and four parts γ5, γ6, γ7, and γ8 in the second row C2, and the third row C3. 3 stores three parts σ6, σ7, and σ8 on the side closer to the substrate 1, respectively, and the four parts γ1, γ2, γ2, γ4 in the first row C1 and the four parts in the second row C2. γ5, γ6, γ7, and γ8 are all attracted by the head 61 (H1), and the three parts σ6, σ7, and σ8 in the third row C3 are attracted by the head 62 (H2). It has been decided.
[0040]
Furthermore, the feeder 74 has two parts σ1 and σ2 in the first column C1, two parts σ3 and σ4 in the second column C2, and one part σ5 in the third column C3. Each of them is stored on the side close to the substrate 1, and it is already determined by the mounting head parameter that both are attracted by the head 62 (H2).
[0041]
From the above, the component α is stored in the feeder 71 and sucked by the head 61 (H1), and the component β is stored in the feeder 72 and sucked by the head 62 (H2). Accordingly, the component α and the component β can be simultaneously sucked by the heads 61 and 62 on the same side with respect to the beam 5.
[0042]
The component γ is stored in the feeder 73 and sucked by the head 61 (H1), and the component σ is stored in the feeders 73 and 74 and sucked by the head 62 (H2). Accordingly, the component γ and the component σ can be simultaneously sucked by the heads 61 and 62 on the same side of the beam 5 opposite to the components α and β with respect to the component α and β.
[0043]
In the example shown in FIG. 3, when a conventional simple full search is performed, the number of combinations is 13 parts α1 to α5 and γ1 to γ8 that are attracted by the head 61 (H1). Since there are 13 parts of β1 to β5 and σ1 to σ8 in (H2), the total number of combinations is “ ₁₃ P ₁₃ ”, and the actual number is about 6.2 billion. Of course, this combination includes a meaningless combination such as the simultaneous adsorption of the components located on the opposite side of the substrate 1 such as the component α and the component σ by the heads 61 and 62.
[0044]
Therefore, in the method of the present invention, the heads 61 and 62 simultaneously suck only the components stored in the feeders 71 and 72 located on one side of the substrate 1, and the feeder located on the other side of the substrate 1. Only the parts stored in 73 and 74 are sucked at the same time. In this case, assuming that the number of simultaneous suctions is 100% as an example, there are five parts α1 to α5 that the head 61 (H1) sucks, and five parts that the head 62 (H2) sucks are β1 to β5. Therefore, the number of combinations by these is “ ₅ P ₅ ”, and there are 120 real numbers. Further, in the feeders 73 and 74, there are eight parts γ1 to γ8 attracted by the head 61 (H1), and eight parts σ1 to σ8 are attracted by the head 62 (H2). the number combination is the real number becomes _"8 P _8" is a 40320 ways.
[0045]
Therefore, the total number of combinations is “120 × 40320” = “4838400”, that is, about 4.8 million. This is 1/1000 or less of the total number of searches described above of about 6.2 billion.
[0046]
The time required for the actual simulation is about 133 hours (about 5.5 days) in the method of the present invention, assuming that the time required for one iteration is 0.1 second, and is the same when a conventional full search is performed. It is about 133000 hours (about 5000 days) under conditions.
[0047]
【The invention's effect】
As described in detail above, according to the mounting time simulation method of the component mounting apparatus of the present invention, it is easier to deal with board changes than the conventional technique assigned by an expert, and compared to the full search technique. By searching only the limited solution space, it is possible to search efficiently and in a realistic time.
[0048]
Furthermore, since only the remaining solution space is searched by excluding the solution space that has little influence on the optimization, the optimum value can be obtained relatively easily. This is a significant advantage compared to the fact that it is not possible to prove whether or not the optimum value has actually been obtained by a solution using a heuristic method such as GA or a sorting method by an expert.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a configuration and an operating state of a component mounting apparatus to which a mounting time simulation method for a component mounting apparatus according to the present invention is applied.
FIG. 2 is a flowchart showing a procedure of a mounting time simulation method for the component mounting apparatus of the present invention.
FIG. 3 is a schematic diagram for explaining an actual application example of a mounting time simulation method for a component mounting apparatus according to the present invention;
[Explanation of symbols]
1 Substrate 41, 42 Rail 5 Beam 61, 62 (H1, H2) Head 71, 72, 73, 74 Feeder α, β, γ, σ Parts

Claims (3)

Each of the two parts can move independently from each other in a second direction intersecting the first direction on a moving member moving in the first direction from a plurality of parts storage parts storing the parts. In the method of simulating the mounting time of the component mounting apparatus that is to be taken out and mounted on the board set at a predetermined position, the component storage unit is arranged in one side of the first direction in the second direction. The second heads are arranged in the second direction on the other side of the first direction, and the two heads are arranged in the second direction on either one side or the other side of the first direction. A mounting time simulation method for a component mounting apparatus, wherein the mounting time is simulated only for a combination in which the components can be simultaneously taken out from the component storage unit only by movement. At the same time, the number of combinations of components that can be taken out from the component storage unit is 1/2 of the total number of components, and the maximum integer not exceeding 1/2 of the total number of components. The mounting time simulation method for a component mounting apparatus according to claim 1, wherein the mounting time is simulated when each is within a predetermined range. The component mounting apparatus mounting time simulation method according to claim 2, wherein the predetermined range is 90% to 100%.

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