JPH05104364A - Method for optimizing order of mounting of component - Google Patents

Abstract

PURPOSE:To determine optimum order of mounting of components using a single parameter by arranging cassette groups in the order of the speed of mounting, and aligning pairs within the same group, and determining the order of alignment of the cassettes, and then using only the order of mounting of components as a parameter. CONSTITUTION:Component cassettes from which components are fed are grouped according to the speed of mounting applied to each group. Within each group of cassettes those to be mounted in a larger number and those to be mounted in a smaller number on the same substrate are made in pairs so that when cassettes within the same group are made in pairs the pairs are equal in the total of components mounted. The groups of cassettes are aligned in the order of the speed of mounting and the cassettes are aligned by pairs within the same group. The order of mounting is determined in view of the distance by which the components in each of the pairs thus arranged are moved when mounted on a substrate, so that the total time required for mounting the components is minimized.

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 sequence that minimizes the total mounting time when mounting components on a board with a component mounting apparatus.

[0002]

2. Description of the Related Art In a component mounting apparatus for mounting a component 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 multiple cassettes that supply components are arranged side by side, the components are picked up by the mounting head, and then moved to a predetermined position on the board to be mounted, the arrangement sequence of the cassettes and the component mounting sequence minimize the total mounting time. Japanese Patent Laid-Open No. 1-283604 discloses a method for optimizing the arrangement order of cassettes. That is, the mounting program is optimized while changing two parameters of the arrangement order of the cassette and the mounting order of the components.

[0003]

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

[0004]

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

[0005]

The optimum component mounting sequence can be determined with a single parameter.

[0006]

【Example】

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

FIG. 1 is a flow chart showing an embodiment of the component mounting sequence optimizing method of the present invention, FIG. 2 is a block diagram showing the configuration of an apparatus for executing the embodiment of FIG. 1, and FIG. 3 is a flow chart of FIG. It is a supplementary explanatory view.

In FIG. 2, reference numeral 11 denotes an NC program creating apparatus having a central processing unit and a memory, which executes the flow chart shown in FIG. 1 stored in the memory to determine the 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 the NC program creation device 11
The floppy disk drive 13 stores the component mounting order data created by the NC program creating device 11, and is used for inputting data and operation commands.
Is displayed, and further, the component mounting order data is printed on the printer 15 as required.

Next, a component mounting order optimizing method will be described with reference to FIGS. 1 and 3. First, the operator uses the keyboard 12 to input the input data regarding the mounting speed and the number of mounting points applied to each component shown in 1 of FIG.
It is input to the C program creating device 11 to cause the NC program creating device 11 to execute the flowchart of FIG. Here, it is assumed that the mounting speed 1 is higher than the mounting speed 2.

Step 1

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

Step 2

The NC program creating device 11 has a function for each part in each group divided in one step.
Count the number of installed points.

Step 3

The NC program creating device 11 sequentially combines the ones having a large number of mounting points and the ones having a small number of mounting points so that the sum of the mounting points when the two component cassettes in the same group are combined is equalized. Make pairs. That is, as shown at 3 in FIG.
In the group, the component G with the largest number of mounting points,
Combining with the least number of parts C to make one pair,
The second largest part A and the second smallest part E are combined to form another pair. Also in the group of the mounting speed 2, the pair group including the parts B and F and the parts D and H is similarly formed.

Step 4

Then, the NC program creating device 11
The component cassettes in each group are arranged for each pair and in the order of pairs having the largest number of mounting points. As shown in 4 of FIG. 3, in the group of the mounting speed 1, the pair consisting of the parts G and C having the largest number of mounting points in the pair is arranged at the head, and the pair consisting of the parts A and E having the next largest number of points is followed. Let Similarly, in the group of the mounting speed 2, the pair of components B and F is followed by the pair of components D and H. In this embodiment, they 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 device 11 arranges the cassette groups in the order of the group having the highest mounting speed and determines the arrangement of the component cassettes. That is, FIG.
As shown in No. 5, the group of the mounting speed 1 is arranged at the head of the cassette position, and the group of the mounting speed 2 having the slower mounting speed is arranged after the group of the mounting speed 1. Within each group, as described above, they are arranged in the order of pairs with the largest number of points to be attached. In this embodiment, the mounting speeds are arranged in ascending order, but the mounting speeds may be arranged in ascending order.

Step 6

After determining the arrangement of the component cassettes as described above, the NC program creating device 11 pays attention to the distance that the components in each pair move for mounting, and sets only the mounting sequence of the components as a parameter. The optimization process is performed to determine the component mounting order that minimizes the total mounting time. The component mounting order data thus determined is stored in the floppy disk by the floppy disk drive 13 of FIG. 2, displayed on the CRT, or printed on the printer 15 as necessary. Furthermore, if the component mounting order data is sent to the component mounting device 16 and stored therein, the operator causes the CRT of the component mounting device to display the data and loads the component cassette in the order instructed,
Only by starting the mounting operation, the component mounting device 16 can be operated in the optimized mounting order.

[0023]

According to the component mounting sequence optimizing method of the present invention, the optimum component mounting sequence can be determined with a single parameter, which is simpler than the case where the cassette array sequence and the component mounting sequence are used as parameters. It can be processed in a short time with various calculations. Further, since the arrangement order of the component cassettes is not set as a parameter for the optimization processing but is determined by a simple calculation, the processing time can be shortened. Further, 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 the mounting efficiency can be improved.

[Brief description of drawings]

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

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

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

[Explanation of symbols]

 11 NC Program Creation Device 12 Keyboard 13 Floppy Disk Drive 14 CRT 15 Printer 16 Parts Mounting Device

Claims (1)

[Claims] 1. A method for optimizing a mounting sequence when mounting a component on a board by a component mounting apparatus, wherein a component cassette group 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 formed by appropriately combining one with a large number of mounting points and one with a small number of mounting points for the same substrate. The cassette groups are arranged in the order of mounting speed, and in the same group, they are arranged for each pair, paying attention to the movement distance when the components in each pair arranged as described above are mounted on the board. A method for optimizing the component mounting order, which determines the mounting order so as to minimize the total mounting time.