JPH06106340A - Flux applying method - Google Patents

Abstract

PURPOSE:To provide a means for easily checking that a flux gushes from a spray nozzle in the spray type flux applying method for applying a flux to a circuit board. CONSTITUTION:A coloring liquid supply tank 8 for supplying a coloring liquid 7 is provided in the middle of a hose 6 connecting a flux supply tank 4 for supplying the flux 1 of a flux applying device 3 and the spray nozzle 5 in the spray type flux applying method for applying the flux 1 to the circuit board 2. The valve of a washing liquid supply tank 9 is opened and after the hose 6 is washed with the washing liquid 10, the coloring liquid 7 is injected from the spray nozzle 5 and the flux 1 is injected onto the circuit board 2 after checking that the washing liquid 10 does not exist in the hose 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray type flux applying method for applying flux to a circuit board.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view of a conventional example. In the figure, 1 is a flux, 2 is a circuit board, 3 is a flux applicator, 4 is a flux supply tank, 5 is a spray nozzle, 6 is a hose, 9 is a cleaning liquid supply tank, 10 is a cleaning liquid, and 11 is a valve. .

No-clean flux 1 currently used
Has a solid content of 5% or less and a solvent content of 95% or more in the flux 1 in order to improve the appearance quality of the circuit board 2 after soldering and the probing property during inspection. Before applying the flux,
Since the spray nozzle 5 is cleaned, it is impossible to distinguish the cleaning liquid 10 to be passed through the hose 6 from the external appearance.

Therefore, at the start of the application work of the flux 1, it was not possible to discriminate well whether the cleaning liquid 10 remaining during the cleaning was ejected from the spray nozzle 5 of the flux applicator 3 or the flux 1 was ejected. .

[0005]

Therefore, in order to prevent the cleaning liquid 10 from being accidentally applied to the circuit board 2 and soldering, the flux 1 is normally ejected from the flux applying device 3 for a long time. Then, the cleaning liquid 10 is completely removed, and then the flux 1 is applied onto the circuit board 2.

However, since there is no means for visually confirming whether or not the cleaning liquid 10 has been completely removed from the inside of the flux coating device 3, the cleaning liquid 10 is erroneously applied or a large amount of flux 1 is ejected for a long time. Flux 1
Was inconveniently consumed.

In view of the above problems, it is an object of the present invention to provide a means for easily confirming that flux is ejected from a spray nozzle.

[0008]

FIG. 1 is a diagram for explaining the principle of the present invention. In the figure, 1 is a flux, 2 is a circuit board, 3 is a flux applicator, 4 is a flux supply tank, 5 is a spray nozzle, 6 is a hose, 7 is a coloring liquid, 8
Is a coloring liquid supply tank, 9 is a cleaning liquid supply tank, 10 is a cleaning liquid, and 11 is a valve.

The above problem is caused by using the flux coating device 3 in which the coloring liquid supply tank 9 containing the coloring liquid 10 is provided between the flux supply tank 4 containing the flux 1 and the hose 6 connecting the spray nozzle 5. It can be solved by

That is, an object of the present invention is to provide a flux type coating device 3 as shown in FIG. 1 (a) in a spray type flux coating method for coating a flux 1 on a circuit board 2.
In the middle of the hose 6 which connects the flux supply tank 4 for supplying the flux 1 and the spray nozzle 5, a coloring liquid supply tank 8 for supplying the coloring liquid 7 is provided. First, the valve of the cleaning liquid supply tank 9 is opened, and the cleaning liquid 10 is supplied. After sending the spray nozzle 5 through the hose 6 to wash the spray nozzle 5, the coloring liquid 7 is ejected from the spray nozzle 5 as shown in FIG. After confirming that there is not, it is achieved by injecting the flux 1 onto the circuit board 2 as shown in FIG.

[0011]

In the present invention, before spraying the flux 1, the coloring liquid 7 is passed through the hose 6 and it is confirmed that there is no residual liquid of the cleaning liquid 10 in the hose 6 and the spray nozzle 5. Since the flux 1 is ejected onto the circuit board 2, it can be confirmed that the flux 1 is ejected completely from the spray nozzle 5 with the minimum amount of the flux 1.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is an explanatory view of an embodiment of the present invention. In the figure, 1 is a flux, 2 is a circuit board, 3 is a flux applicator, 4 is a flux supply tank, 5 is a spray nozzle, 6 is a hose, 7 is a colored liquid, 8 is a colored liquid supply tank, and 9 is a cleaning liquid supply tank. , 10 is a cleaning liquid, 11 is a valve, 12 is a pump, 13 is an input key, 14 is an input / output terminal,
15 is a computer.

An embodiment of the present invention will be described with reference to FIG. FIG. 2 (a) is a schematic diagram of the main body of the flux coating device 3, and FIG. 2 (b) is a system diagram of a control system for controlling the opening / closing of the valve 11 that opens and closes each supply tank to send out the liquid and the operation of the pump. Show.

As shown in FIG. 2A, in addition to the conventional flux supply tank 4 for supplying the flux 1 and the cleaning liquid supply tank 9 for supplying the cleaning liquid, the flux coating device 3 is newly provided with a flux supply device. A coloring liquid supply tank 8 for supplying the coloring liquid 7 is provided in the middle of the hose 6 connecting the tank 4 and the spray nozzle 5.

In the flux supply tank 4, solids 4
About 500 ml of flux 1 containing 4% of flux solids in an organic solvent is contained in the cleaning liquid supply tank 9, and azo dyes and anthraquinone dyes are added to the cleaning liquid supply tank 9 in a polyhydric alcohol such as isopropyl alcohol or glycerin Approximately 500 ml of cleaning solution 10 containing the above substances is added.

First, by operating the control system shown in FIG. 2 (b), the V2 of the valve 11 which is the electromagnetic valve of the cleaning liquid supply tank 9 is opened by the input from the input key 13, and the pump V2 is operated, The cleaning liquid 10 of the flux coating device 3 shown in FIG. 2 (a) is sent to the spray nozzle 5 at a pressure of about 1 kg / cm ² through the 8 mmφ hose 6 to clean the inside of the spray nozzle 5.

After that, V2 of the valve 11 of the colored liquid supply tank 8 is opened, and the cleaning liquid 10 is ejected from the spray nozzle 5 to thoroughly clean the inside of the hose 6 and the inside of the spray nozzle 6. After cleaning, input to the control system and pump P
2 is stopped and valve V2 is closed.

Next, by the same operation, open the valve V3,
By operating the pump P3, a cleaning liquid 10 in which an azo dye, anthraquinone dye or the like is mixed with isopropyl alcohol or the like in the coloring liquid supply tank 8 or a multi-valued alcohol such as glycerin is jetted from the spsley nozzle 5 through the hose 6. .

The coloring liquid 7 is dyed in blue, and is sprayed from the spray nozzle 5 for 1 minute to completely remove the colorless cleaning liquid 10. Then, the pump P3 is stopped and the valve V3
Close.

The circuit board 2 is placed at the jetting position of the spray nozzle 5.
Set. In the same manner as described above, by inputting to the control system, opening the valve V1 and operating the pump V1, the flux 1 is ejected from the flux supply tank 4 through the hose 6 from the spray nozzle 5 for 1 minute or more. At this time, the coloring liquid 7 in the hose 6 has a small diameter of 8 mmφ and is extruded without mixing with the flux 1.

After visually confirming that the coloring liquid 7 has been removed from the hose 6 and the spray nozzle 5, the circuit board 2 is set at the ejection position of the spray nozzle 5. At this time, the coloring liquid 7 in the hose 6 has a diameter of 8 mmφ.
And is extruded without mixing with Flux 1.

After that, a predetermined flux 1 is applied to the circuit board 2.
Is applied by the flux applying device 3.

[0023]

As described above, by flowing the coloring liquid into the hose before applying the flux to the circuit board, the cleaning liquid does not remain in the hose and the flux is completely ejected from the spray nozzle. Can be confirmed.

As a result, it becomes possible to reduce the consumption of flux and reliably solder the circuit board.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention.

FIG. 2 is an explanatory diagram of an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Flux 2 Circuit board 3 Flux coating device 4 Flux supply tank 5 Spray nozzle 6 Hose 7 Color liquid 8 Color liquid supply tank 9 Cleaning liquid supply tank 10 Cleaning liquid 11 Valve 12 Pump 13 Input key 14 Input / output terminal 15 Computer

Claims (1)

[Claims] 1. A spray type flux applying method for applying flux (1) to a circuit board (2), wherein a flux supply tank (4) for supplying the flux (1) of a flux applying device (3) and a spray nozzle ( 5) hose connecting (6)
Coloring liquid supply tank (8) that supplies coloring liquid (7) in the middle of
Open the valve of the cleaning liquid supply tank (9),
After washing the hose (6) with (10), spray the colored liquid (7) from the spray nozzle (5), and confirm that the washing liquid (10) is not in the hose (6). Then, the flux applying method characterized in that the flux (1) is sprayed onto the circuit board (2).