JPH098492A - Part arrangement optimizing method - Google Patents

Abstract

PURPOSE: To lessen all boards of various kinds in mounting time as a whole by a method wherein the mounting time of parts of various kinds are weighted with the number of the boards of each kind to be produced. CONSTITUTION: Parts which are used in common for three kinds (ABC) of boards are selected, then parts which are used in common for two kinds (AB, BC, and CA) of boards are selected, and furthermore parts which are used for only one kind (A, B, and C) of boards are selected (#1 to #3). Then, the numbers of boards of three kinds (A, B, and C) to be produced, α, β, and γ, are taken in (#4). The part arrangement of each kind of boards are preliminarily determined (#5). The mounting simulation times X, Y, and Z of each kind (A, B, and C) are calculated (#6 to #8). The mounting times X, Y, and Z required for three kinds A, B, and C of board are multiplied by the number of boards of each kind to produce to get Xα, Yβ, and Zγ respectively, then the sum of Xα, Yβ, and Zγ is obtained, and this optimizing process is returned to a step #5 so as to be repeatedly carried out until the minimum value of a total production time (Xα, Yβ, and Zγ) is obtained, and the process is repeatedly carried out as parts are changed in arrangement, whereby a part arrangement which minimizes the total production time is determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component arrangement optimization method for determining a component arrangement so as to shorten the mounting time when components are mounted on a plurality of types of boards without replacing the components. is there.

[0002]

2. Description of the Related Art In recent years, with the diversification of market needs, the manufacturing system of manufacturers has changed from conventional small-volume mass production to high-mix low-volume production. Is required to reduce the setup change of components and shorten the mounting tact as much as possible for the change of the board type. Therefore, it is required to optimize the component arrangement.

A conventional method of optimizing a component arrangement will be described below with reference to FIGS. 2 to 8 in the case where three types of boards are produced without exchanging components.

In FIG. 2, first, parts common to three types (ABC) are extracted (step # 11), and then two types (A).
B, BC, CA) common parts are extracted (step # 1
2) Next, parts for each type (A, B, C) are extracted (step # 13), and based on them, the drive distance of the Z axis (the axis along which the component supply unit moves during component mounting) is short. Therefore, the mounting priority is determined for each type of board, and the component arrangement is determined as shown in FIGS. 3 to 8 according to each case (step # 14).

FIG. 3 shows a component arrangement in which the priority for shortening the mounting time for each type of board is set in the order of A type, B type, and C type, and when mounting on each type of substrate at that time. The operation range of the Z axis is shown.

Similarly, in FIG. 4, when the mounting priority for the board is A type, C type, and B type, FIG. 5 is B type, A type.
6 are B, C, and A, FIG. 7 is C, A, and B, and FIG. 8 is C.
The types of product, B, and A are shown respectively.

[0007]

However, in the above-mentioned conventional method, since the component arrangement is only determined so as to shorten the driving distance of the Z axis, the component arrangement is assumed to be as shown in FIG.
Even if it is decided to be any one of FIG. 8, there is a problem that the total mounting time may not always be the minimum because the number of products manufactured differs for each type when actually manufactured.

Further, even if the drive distance of the Z axis is shortened, XY
Which of the layouts in FIGS. 3 to 8 can actually minimize the mounting time because the drive waiting time of the table is not taken into consideration and the layout of the components in each common component is not determined. There is a problem that I do not understand.

In view of the above conventional problems, it is an object of the present invention to provide a parts arrangement optimization method capable of minimizing the actual production time.

[0010]

A component array optimization method according to the present invention determines a component array so as to shorten a mounting time when components are mounted on a plurality of types of boards without replacing the components. An optimization method is characterized in that the mounting time of components on various boards is weighted by the number of produced boards of each board, and the component arrangement is determined so as to shorten the total mounting time for all boards.

Alternatively, the process of tentatively determining the component array and calculating the mounting time of various boards is repeated by changing the component array,
It is characterized in that the component arrangement is determined so that the total mounting time of various boards is minimized.

Further, the process of tentatively determining the component array and calculating the mounting time in which the mounting time of the components on various boards is weighted by the number of produced boards of each board is repeated by changing the component array, and all the boards are processed. The feature is that the component arrangement is determined so that the total mounting time is the shortest.

[0013]

According to the component arrangement optimizing method of the present invention, the component placement is not determined based on the Z-axis driving distance, but the total mounting time is determined based on the mounting time for each board type and the number of produced boards. By deciding the component arrangement so that the mounting time is minimized, the mounting time can be shortened and efficient production can be performed.

Further, the process of tentatively determining the component array and calculating the mounting time of various boards is repeated by changing the component array,
If the component arrangement is determined so that the total mounting time of the various boards is minimized, it is possible to surely determine the component arrangement that shortens the actual mounting time.

Further, by weighting the number of products to be produced in the process of tentatively determining the component arrangement and calculating the mounting time of various boards, it is possible to determine the component arrangement that minimizes the actual total mounting time.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for optimizing a component arrangement according to the present invention in which three types of boards are produced without exchanging components will be described with reference to FIG.

In FIG. 1, first, parts common to three types (ABC) are extracted (step # 1), and then two types (A).
B, BC, CA) common parts are extracted (step #
2) Next, parts for each type (A, B, C) are extracted (step # 3). Next, the production numbers α, β, and γ of the respective types A, B, and C are fetched (step # 4). next,
As shown in any of FIGS. 3 to 8, the component arrangement is provisionally determined so that the drive distance of the Z axis (axis on which the component supply unit moves during component mounting) becomes short for each product type (step # 5).

Next, the mounting times of the respective types A, B and C are simulated to calculate the mounting times x, y and z (steps # 6, # 7 and # 8). And each kind A,
Total production time (xα + yβ + z), which is the sum of the production time for each product type, which is obtained by multiplying the mounting time for B and C by the number of each production
γ) is calculated, the process returns to step # 5 until the minimum value of the total production time is found, the parts arrangement is sequentially changed, and the above process is repeated to determine the parts arrangement giving the minimum total production time (step # 9).

[0019]

According to the component arrangement optimizing method of the present invention,
As is clear from the above description, the component placement is not determined based on the Z-axis drive distance, but the total mounting time is calculated based on the mounting time for each board type and the number of products to be produced, and the mounting time is calculated. By determining the component arrangement so as to minimize the mounting time, the mounting time can be shortened and efficient production can be performed.

Further, the process of tentatively determining the component array and calculating the mounting time of various boards is repeated by changing the component array,
If the component arrangement is determined so that the total mounting time of the various boards is minimized, it is possible to surely determine the component arrangement that shortens the actual mounting time.

Furthermore, by weighting the number of products to be produced in the process of tentatively determining the component arrangement and calculating the mounting time of various boards, it is possible to determine the component arrangement that minimizes the actual total mounting time.

[Brief description of drawings]

FIG. 1 is a flow chart of a parts arrangement optimization method according to an embodiment of the present invention.

FIG. 2 is a flowchart of a conventional component arrangement optimization method.

FIG. 3 is an explanatory diagram of a first component arrangement.

FIG. 4 is an explanatory diagram of a second component arrangement.

FIG. 5 is an explanatory diagram of a third component array.

FIG. 6 is an explanatory diagram of a fourth component array.

FIG. 7 is an explanatory diagram of a fifth component array.

FIG. 8 is an explanatory diagram of a sixth component array.

Claims (3)

[Claims] 1. A component arrangement optimizing method for determining a component arrangement so as to shorten the mounting time when the components are mounted on a plurality of types of boards without replacing the components, and the mounting time of the components on various boards. The weighting of the number of each board produced is
A component arrangement optimizing method characterized by deciding a component arrangement so as to reduce the total mounting time for all boards. 2. A component arrangement optimizing method for determining a component arrangement so as to shorten the mounting time when the components are mounted on a plurality of types of substrates without replacing the component, and the provisional determination of the component arrangement is performed. A component array optimizing method characterized by repeating a process of calculating mounting times of various boards by changing a component array and determining a component array so that a total of mounting times of various boards is minimized. 3. A component arrangement optimizing method for deciding a component arrangement so as to shorten a mounting time when the components are mounted on a plurality of types of boards without replacing the component, and the component arrangement is temporarily determined. The process of calculating the mounting time by weighting the number of printed boards for each component on the mounting time of each substrate is repeated by changing the component array, and the component array is arranged to minimize the total mounting time for all the boards. A method for optimizing a component arrangement, characterized by determining.