JP3047597B2 - Component mounting 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 component mounting method for mounting components on a circuit board mounted on an XY table of a component mounting machine.

[0002]

2. Description of the Related Art In recent years, in a situation where components mounted on a circuit board are downsized, wiring density on the circuit board is increased, and the number of components is increased, time loss when moving the XY table and the component supply unit is reduced. It is required to determine a less efficient mounting procedure and to shorten the component mounting time.

Hereinafter, a conventional component mounting method will be described. FIG. 3 is a diagram for explaining a conventional component mounting method. As shown in FIG. 3, the component supply unit 1 component supplied are arranged in a straight line in the parts cassette z ₁ to z _100, there is a degree of freedom only in a one-dimensional direction as indicated by the arrow.
The component supply unit 1 is moved so that the component mounting head 2 can pick up the component, and the component mounting head 2 picks up the component and then moves onto the circuit board 4 to mount the component. In this case, in order to reduce the time required for mounting the components on the circuit board 4, it is necessary to minimize the movement of the component supply unit 1 and the XY table 3.

FIG. 4 is a flowchart for determining a component mounting order in a conventional component mounting method. First, after determining the first mounting point for mounting the first component on the circuit board 4,
In step 41 (hereinafter, step is abbreviated as ST), the circuit board 4 is moved within a range in which the parts cassette and the XY table 3 of the parts supply unit 1 can move within one cycle (hereinafter referred to as tact) in which the parts mounting head 2 does not wait. It is determined whether or not there is a next mounting point above, and if so, the mounting point is set as the second mounting point in ST42, and if not, the mounting point in which movement of the parts cassette or the XY table 3 is the shortest is determined in ST43. If there is, it is set as a second mounting point in ST44. Such an operation is performed while searching for all the unmounted mounting points, and the mounting points are sequentially determined.

[0005]

However, in the above-mentioned conventional configuration, a considerable processing time is required even if the component mounting order is determined by software of a computer, and the number of mounted components per circuit board will increase in the future. Given this, there was a problem that it became more and more disadvantageous.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a component mounting method capable of shortening a processing time for optimizing a component mounting order and improving the efficiency of a mounting machine. .

[0007]

In order to achieve this object, a component mounting method according to the present invention is to mount components in the same part cassette of a component supply unit continuously or move the component supply unit within a tact. A grouping step for determining whether components within the range of the number of possible part cassettes are to be continuously mounted, and X in the group determined in the grouping step.
It has a sorting step of sequentially determining the next mounting point at which the Y table can move within the tact, and a step of mounting components on the circuit board according to the procedures determined by the grouping step and the sorting step.

[0008]

With this configuration, the range for searching for the next mounting point when determining the component mounting order is limited to the range of the same part cassette or at most the number of part cassettes that can be moved within a tact. The search time for the next mounting point on the circuit board can be reduced, the processing time for determining the component mounting order can be significantly reduced, and efficient component mounting can be performed.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining a component mounting method according to an embodiment of the present invention, and FIG. 2 is a flowchart for determining a component mounting order in the component mounting method. First, the schematic operation of the component mounting method will be described with reference to FIG. The parts supply section 5 has a parts cassette composed of z ₁ to z _{n + 3} . The present embodiment is an example of a mounting machine that can move only one part cassette within a tact, and is divided into a group 6 of two. Therefore, the movement of the component supply unit 5 is (z ₁ , z ₂ ) → (z ₃ , z ₄ ) →.
(Z _n , z _{n + 1} ) → (z _{n + 2} , z _{n + 3} ) →... 7 is a circuit board mounted on an XY table,
8 is a first mounting point, 9 is a second mounting point, and 10 is a third mounting point.

With the above relationship, the flowchart shown in FIG. 2 is executed. First, as shown in the first step, in ST11, the first mounting point 8 (hereinafter referred to as point (a)) is set to be closest to the XY origin on the circuit board 7, and the components to be mounted there are placed in the component supply unit. 5 arranged in z ₁ of.

The second step shows an algorithm for determining a second mounting point 9 (hereinafter referred to as a point (b)) in a state where the component group of z _n and z _{n + 1} has been mounted up to the point (a). . If it is determined in ST21 whether or not there is a mounting point of a component of z _n or z _{n + 1 that} can move the XY table in the tact from the point (a), it is determined as a point (b) in ST22. If not, it is determined in ST23 whether or not there is a mounting point of the component of the nearest z _n or z _{n + 1} from the point (a), and if it is, it is determined as a point (b) in ST24. Otherwise, since all the component groups of z _n and z _{n + 1} have already been mounted, it is determined in ST25 whether or not there is a point that can be moved from the point (a) to the tact or the nearest point in the unplaced component. If there is, in ST26, the component is placed on z _{n + 2} using that as the point (b), and the process proceeds to the third step to determine the next mounting point (c) (hereinafter, point (c)). If it is not ST25, it is determined in ST27 whether or not there is a mounting point of the unplaced component closest to the point (a), and if so, in ST28, it is set as the point (b) and the part is placed in z _{n + 2} . , Third
Proceeding to the step, the next mounting point (c) (hereinafter referred to as point (c)) is determined. If not ST27, the process ends.

The third step shows an algorithm for determining the point (c). In ST31, it is determined whether there is a point that can be moved from the point (b) in the tact or the nearest point in the part of z _{n + 2} or the unplaced part. Proceed to step to determine the next mounting point. In addition there, to determine whether there is (a) point recent implementation point beside unplaced parts in ST27, placing unplaced components to z _{n + 3} in ST28, if any. If not ST28, end.

Similarly, in the fourth step, z _{n + 2} , z _{n + 3}
The next mounting point is searched for and determined from the parts in the group. In this way, the order of mounting is repeatedly determined up to the last component group, and the process ends. As described above, the components are mounted on the actual board in accordance with the determined mounting order of the components.

[0014]

As described above, according to the present invention, the mounting time is almost the same as the conventional method of determining the mounting order.
According to a simulation on a personal computer for 500 mounting points, the processing time for determining the mounting order can be reduced from less than 20 minutes to one minute in the past. The effect is expected to increase further as the number of mounting points increases in the future.

[Brief description of the drawings]

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

FIG. 2 is a flowchart for determining a component mounting order in the component mounting method.

FIG. 3 is a diagram for explaining a conventional component mounting method.

FIG. 4 is a flowchart for determining a component mounting order in the component mounting method.

[Explanation of symbols]

 5 Parts supply section 6 Parts cassette 7 Circuit board

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-8437 (JP, A) JP-A-62-203731 (JP, A) JP-A-1-128500 (JP, A) JP-A-1- 283604 (JP, A) JP-A-2-100840 (JP, A) JP-A-4-171999 (JP, A) JP-A-4-348830 (JP, A) JP-A-5-104364 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H05K 13/02

Claims (1)

(57) [Claims] 1. A component within a range of the number of parts cassettes in which a component supply unit can be moved in one cycle in which components in the same part cassette of the component supply unit are continuously mounted or a component mounting head does not enter a wait state. And a sorting step for sequentially determining the next mounting point at which the XY table can move within the one cycle in the group determined in the grouping step, and the grouping step. And a step of taking out components from a component supply unit in accordance with the order determined by the sorting step and mounting the components on a circuit board.