JP2957778B2 - Component placement order optimization method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining an optimum component mounting order for minimizing a total mounting time when components are mounted on a board by a component mounting apparatus.

[0002]

2. Description of the Related Art In a component mounting apparatus for mounting components on a board by numerical control, an optimization process of a mounting program has been performed in order to minimize the total mounting time. When arranging a plurality of cassettes for supplying parts, picking up parts with the mounting head, and moving to a predetermined position on the board for mounting, the order of the cassette and the mounting order of the parts minimize the total mounting time. JP-A-1-283604 discloses a method for optimizing the cassette arrangement order. That is, optimization of the mounting program is realized while changing two parameters of the cassette arrangement order and the component mounting order.

[0003]

However, in such a method, since the optimization process is performed by using two parameters, ie, the cassette arrangement order and the component mounting order, a complicated and large amount of calculation is required.

[0004]

According to the present invention, a group of component cassettes for supplying a component is divided into groups according to a mounting speed applied to the component, and two cassettes in the same group are combined. In order to equalize the sum of the number of mounting points at the same time, pairs having a large number of mounting points and those having a small number of mounting points on the same substrate are appropriately combined to form a pair group. And this cassette group is arranged in order of mounting speed,
In the same group, the pairs are arranged for each pair, and the sequence of the cassettes is determined. Then, an optimization process is performed using only the component mounting order as a parameter to determine a mounting order that minimizes the total mounting time.

[0005]

The optimal component mounting order can be determined by a single parameter.

[0006]

【Example】

An embodiment of the component mounting order optimizing method according to the present invention will be described with reference to the drawings.

FIG. 1 is a flowchart showing an embodiment of the component mounting order optimizing method according to the present invention, FIG. 2 is a block diagram showing a configuration of an apparatus for executing the embodiment of FIG. 1, and FIG. It is a supplementary explanatory diagram.

In FIG. 2, reference numeral 11 denotes an NC program creating device having a central processing unit and a memory, and executes the flowchart shown in FIG. 1 stored in the memory to determine an optimum component mounting order. A keyboard 12, a floppy disk drive 13, a CRT 14, and a printer 15 are connected to the NC program creating device 11. The keyboard 11 is an NC program creating device 11
The floppy disk drive 13 stores the component mounting order data created by the NC program creating device 11, and stores the data in the CRT.
Is displayed, and the component mounting order data is printed on the printer 15 as necessary.

Next, a method for optimizing the order of mounting components will be described with reference to FIGS. First, the operator inputs, using the keyboard 12, input data relating to the mounting speed and the number of mounting points applied to each component shown in FIG.
It is input to the C program creation device 11 and causes the NC program creation device 11 to execute the flowchart of FIG. Here, it is assumed that the mounting speed 1 is at a higher speed level than the mounting speed 2.

One step

The NC program creating device 11 divides a group according to a mounting speed applied to each component based on the input data. That is, as shown at 1 in FIG. 3, the group is divided into a group of mounting speed 1 and a group of mounting speed 2.

Step 2

The NC program creating device 11 performs the following for each part in each group divided in one step.
Count the number of mounting points.

Step 3

The NC program creating device 11 sequentially combines components having a large number of mounting points and components having a small number of mounting points so that the sum of the number of mounting points when two component cassettes in the same group are combined is equalized. Make pairs. That is, as shown in 3 of FIG.
Group, the component G with the largest number of mounting points,
Combine with the fewest parts C to make one pair,
Another pair is made by combining the next largest component A and the next smallest component E. Similarly, a group of parts B and F and parts D and H is formed in the group of the mounting speed 2.

Step 4

The NC program creating device 11
The component cassettes in each group are arranged in pairs and in order of the pair having the largest number of mounting points. As shown at 4 in FIG. 3, in the group of mounting speed 1, a pair consisting of components G and C having the largest number of mounting points in the pair is arranged at the top, and a pair consisting of components A and E having the next largest number of points is succeeding. Let it. Similarly, in the group of mounting speed 2, a pair of components D and H follows a pair of components B and F. In the present embodiment, the mounting points are arranged in descending order of the number of mounting points, but they may be arranged in descending order.

Step 5

Next, the NC program creating apparatus 11 arranges the cassette groups in order of the group having the highest mounting speed, and determines the arrangement of the component cassettes. That is, FIG.
As shown in (5), a group of mounting speed 1 is arranged at the head of the cassette position, and a group of mounting speed 2 having a lower mounting speed is arranged after this group of mounting speed 1. In each group, the pairs are arranged in the order of the number of mounting points as described above. In the present embodiment, they are arranged in the order of increasing mounting speed, but they may be arranged in order of decreasing mounting speed.

Step 6

After determining the arrangement of the component cassettes as described above, the NC program creating apparatus 11 pays attention to the distance that the components in each pair move for mounting, and uses only the mounting order of the components as a parameter. An optimization process is performed to determine a component mounting order that minimizes the total mounting time. The component mounting order data determined in this way is stored in a floppy disk by the floppy disk drive 13 of FIG. 2, displayed on a CRT, or printed on a printer 15 as necessary. Further, by sending the component mounting order data to the component mounting device 16 and storing the same, the operator displays the data on the CRT of the component mounting device and loads the component cassettes in the specified order.
Simply by starting the mounting operation, the component mounting apparatus 16 can be operated in the optimized mounting order.

[0023]

According to the component mounting order optimizing method of the present invention, the optimum component mounting order can be determined with a single parameter, so that it is simpler than the case where the cassette arrangement order and the component mounting order are used as parameters. It can be processed in a short time with simple calculations. Further, since the arrangement order of the component cassettes is not determined as a parameter of the optimization processing but is determined by a simple calculation, the processing time is short. Furthermore, since component mounting is handled for each pair of a component having a large number of mounting points and a component having a small number of mounting points, the moving time for the component having a small number of mounting points is reduced, and mounting efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an embodiment of a component mounting order optimizing method according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of an apparatus that executes the embodiment.

FIG. 3 is an explanatory diagram supplementing the flowchart of FIG. 1;

[Explanation of symbols]

 Reference Signs List 11 NC program creation device 12 Keyboard 13 Floppy disk drive 14 CRT 15 Printer 16 Component mounting device

Continuation of front page (56) References JP-A-3-154727 (JP, A) JP-A-2-195407 (JP, A) JP-A-2-76653 (JP, A) JP-A-1-283604 (JP) JP-A-64-5100 (JP, A) JP-A-63-180485 (JP, A) JP-A-63-179600 (JP, A) JP-A-62-113496 (JP, A) 62-107931 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23P 21/00 307 G05B 15/02 H05K 13/04 B23Q 41/08

Claims (1)

(57) [Claims] 1. A method for optimizing a mounting order when mounting a component on a board by a component mounting apparatus, wherein a group of component cassettes for supplying a component is grouped by a mounting speed applied to the component. In order to equalize the sum of the number of mounting points when two cassettes in the same group are combined, a pair group is configured by appropriately combining those having a large number of mounting points and those having a small number of mounting points on the same substrate, Cassette groups are arranged in the order of mounting speed, and within the same group, are arranged for each pair. Paying attention to the moving distance when the components in each pair arranged as described above are mounted on the board. A component mounting order optimizing method that determines a mounting order so as to minimize the total mounting time.