JP2722690B2 - Automatic soldering equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] Regarding an automatic soldering apparatus for a printed board, an automatic soldering apparatus for automatically preheating to a set temperature without interrupting work even if the type of the printed board is different. A fluxer for applying flux, a pre-heating machine,
A soldering machine, a flux washer, and an automatic soldering apparatus having a conveying unit that automatically conveys a printed board, wherein the preheating machine includes a temperature sensor that detects a surface temperature of the printed board, The conveying means is divided into two parts, a conveyor A and a conveyor B, which are separately controlled.
The printed board is passed at a constant speed in the fluxer, stopped and heated in the pre-heater, moved when the temperature sensor detects a predetermined value, transferred to the conveyor B at the end, and supplied with a new printed board, Conveyor B is configured to transport the printed board to a subsequent soldering machine and washer at a constant continuous speed.

[Industrial applications]

 The present invention relates to an automatic soldering device for printed boards.

The printed board unit is completed by mounting components on the printed board and then connecting them by soldering. This soldering is almost entirely performed by an automatic soldering apparatus.

In this soldering, it is better to preheat the soldering part and solder at a higher surface temperature than to apply the flux and solder immediately. This has the effect of improving the solder paste and suppressing the occurrence of warpage. Yes, soldering with high reliability is performed, and the effect differs depending on the surface temperature value. Therefore, it is necessary to appropriately set the heat resistance of the printed board and the mounted components.

[Conventional technology]

 FIG. 2 shows an example of a conventional automatic soldering apparatus.

As an example of a conventional jet-type soldering apparatus, as shown in FIG. 2, a fluxer 1 for applying a flux, a pre-heater 25 having an electric heater in a heat shielding chamber, and a soldering machine 45 using a solder jet And a washing machine to remove the flux
45, and a conveyor 55 for automatically transporting the printed board 1 in the order of the steps.

The speed of the conveyor 55 was fixed, and the temperature and heating time of the pre-heater 25 were adjusted to optimal values according to the external dimensions, material, number of conductor layers, pattern shape, mounted components, etc. of the printed board 1.

[Problems to be solved by the invention]

However, in order to preheat the surface temperature to a predetermined value according to the type of the printed board 9, the setting of the heater must be changed each time.
Takes minutes, during which time work is interrupted.

If the pre-heater 25 with the same settings is used without changing the settings of the heaters, the quality of soldering will vary, which will require time for inspection and rework, and reduce the reliability. .

And so on.

An object of the present invention is to provide an automatic soldering apparatus that automatically preheats to a set temperature without interrupting the operation even if the types of printed boards are different in view of such a problem.

[Means for solving the problem]

As shown in FIG. 1, the above problems are caused by a fluxer 1 for applying a flux and a preheating machine 2
An automatic soldering apparatus having a soldering machine 3, a flux cleaning machine 4, and a conveying means for automatically conveying the printed board 9, wherein the preheating machine 2 detects the surface temperature of the printed board 9. A temperature sensor 6 that performs
The conveyor A51 is divided into two parts, a conveyor A51 and a conveyor B52, which are separately controlled. The conveyor A51 heats the printed board 9 at a constant speed in the fluxer 1 and stops and heats the printed board 9 in the preheater 2, and a predetermined value by the temperature sensor 6. Is detected, it is moved to the conveyor B52 at the end and a new printed board 9 is detected.
The conveyor B52 solves the problem by the automatic soldering apparatus of the present invention in which the printed board 9 is conveyed to the subsequent soldering machine 3 and the washing machine 4 at a continuous constant speed.

(Operation)

That is, the preheating surface temperature of the printed board 9 is measured irrespective of the type of the printed board 9, and it is always detected by the temperature sensor 6 that the predetermined value has been reached, so that there is no variation in soldering.

In addition, since the automatic conveying means connecting the respective working steps is divided into a conveyor A51 up to preheating and a conveyor B52 after soldering, and separately controlled, the difference in the preheating time depending on the type of the printed board 9 is small. , Without affecting other processes. For example, even when stopped by preheating, the soldering and cleaning are performed by the conveyor B52, and there is no interruption of the operation.

Thus, even if the type of the printed board is different, it is possible to provide an automatic soldering apparatus for automatically preheating to a set temperature without interrupting the operation.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to examples shown in the drawings. The same reference numerals indicate the same objects throughout the drawings. FIG. 1 shows a configuration diagram of an embodiment of the present invention.

This embodiment is an automatic jet soldering type flow soldering apparatus similar to the above-mentioned conventional example, and its configuration is as shown in FIG.

The fluxer 1 discharges the flux in the form of a molten foam and applies the flux to the lower surface of the printed board 9.

The pre-heater 2 is provided with an electric heater 21 at the lower part of the heat shield room, heats the lower surface of the printed board 9, and the distance thereof is variable. A radiation thermometer-type temperature sensor 6 for measuring the surface temperature of the upper surface of the printed board 9 in a non-contact manner is installed on the upper outside of the heat shield chamber via heat insulating glass.

Because of the stationary heating, the size of the heater only needs to correspond to the approximate length of the printed board 9, which is smaller and smaller in number than the above-mentioned conventional moving heating.
As the distance between the heater and the heater 21 is variable, it is not necessary to control the switch of the heater, and it can be widely applied, for example, by changing the printed board 9 or changing the temperature set value.

The soldering machine 3 is a jet flow soldering machine for soldering the lower surface of the printed board 9.

The washer 4 rotates the roller brush whose lower half is immersed in the cleaning liquid to dissolve, clean and remove the flux.

Conveyor A51 receives a new printed board 9 from supply conveyor 53, and conveys it to fluxer 1 and preheater 2,
Finally, it is delivered to the conveyor B52. A light transmission type arrival sensor 61 is provided on the way, and detects that the printed board 9 has arrived at a fixed position on the heater 21 of the pre-heating machine 2. By this detection, the conveyor A51 is stopped, the printed board 9 is preheated, and when the temperature sensor 6 detects that the surface temperature has reached the predetermined value, the conveyor A51 starts moving again and the subsequent conveyor B52
Hand over the printed board 9.

The conveyor B52 conveys the preheated printed board 9 to the soldering machine 3 and the cleaning machine 4, and finally discharges the printed board 9. A light transmission type passage sensor 62 is provided at the tip end, and detects that the printed board 9 has moved to the conveyor B52 side.

The supply and discharge of the printed board 9 are handled by a storage rack 91 that accommodates the printed board 9 in an up-down direction. On the supply side, in addition to the above, a pneumatic cylinder 92 that pushes out the stored printed board 9 is pushed out. Receiving the printed board 9
A relay supply conveyor 53 for passing to A51 is provided.

In addition, each control unit and drive unit (not shown) are configured.

In operation, one printed board 9 of the storage rack 91 is pushed out by the pneumatic cylinder 92 and is conveyed to the supply conveyor 53 and the conveyor A51.

While being conveyed at a constant speed by the conveyor A51, the flux is applied by the fluxer 1 and the heater 21 of the pre-heating machine 2
Arriving on.

When the arrival sensor 61 detects, the conveyor A51 is stopped and heated by the heater 21.

In the heating state, the temperature sensor 6 measures the surface temperature of several mmφ at the approximate center of the upper surface of the printed board 9.

When it is detected that the predetermined set value has been reached, the conveyor A5
1 is moved again to transfer the printed board 9 to the conveyor B52 which is always operated at a constant speed.

When the passage sensor 62 detects that the printed board 9 has been transferred to the conveyor B52, the pushing operation of the pneumatic cylinder 92 in the supply operation of the printed board 9 is repeated.

The pre-heated printed board 9 ends the soldering via the soldering machine 3 and the washing machine 4 and is housed in the housing rack 91 at the end.

Thus, the preheating temperature of the printed board 9 is measured,
By proceeding to the next step after confirming that the set value has been reached, it is possible to perform soldering with the same temperature profile on all types of printed boards.

From the application of the flux to the soldering, in order to improve the finish of each process, it is a conveyor with a slight rise and slope, and relays the supply conveyor 53 to facilitate delivery at the first supply part. The buffer is provided so that the supply of the printed board 9 is not interrupted even when the supply rack 91 is replaced.

In addition, in addition to the above, the passage sensor 62 also detects an abnormal state in which the printed board 9 is not being conveyed halfway, based on the elapsed time difference from the set value detection time of the temperature sensor 6.

The above embodiment is an example, and the method of supplying and discharging the printed board 9 is not limited to the above-described configuration, and a configuration without the supply conveyor 53 or a storing method without using the pneumatic cylinder 92 may be used.

The conveyor is up and down, but it does not matter whether it is up or down.

Furthermore, although the present invention has been applied to the jet flow soldering apparatus, it is apparent that the present invention can be applied to other flow type and reflow type automatic soldering apparatuses.

〔The invention's effect〕

As described above, according to the present invention, even if the type of the printed board is different, an economical automatic soldering apparatus capable of performing preheating reliably to a set temperature without interruption of work and performing high-quality soldering is realized. Obtained and the effect is great.

[Brief description of the drawings]

 FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a conventional example of an automatic soldering apparatus. In the figure, 1,15 is a fluxer, 2,25 is a preheater, 3,35 is a soldering machine, 4,45 is a washing machine, 5 is a conveyor, 6 is a temperature sensor, 9 is a printed board, 21 is a heater, 51 is a conveyor A, 52 is a conveyor B, 53 is a supply conveyor, 61 is an arrival sensor, 62 is a passage sensor, 91 is a storage rack, and 92 is a pneumatic cylinder.

Claims (1)

(57) [Claims] A fluxer for applying a flux (1)
An automatic soldering apparatus comprising: a preheating machine (2); a soldering machine (3); a flux cleaning machine (4); and a conveying means for automatically conveying the printed board (9). The preheating machine (2) is provided with a temperature sensor (6) for detecting the surface temperature of the printed board (9), and the conveying means includes a conveyor A (51) and a conveyor B (52).
The conveyor A (51) heats the printed board (9) at a constant speed in the fluxer (1), and stops and heats the printed board (9) in the preheater (2). Then, when a predetermined value is detected by the temperature sensor (6), it is moved, and the conveyor B (52) is moved at the end.
And the conveyor B (52) continuously feeds the printed board (9) to the subsequent soldering machine (3) and the washing machine (4). An automatic soldering machine characterized by being transported at a constant speed.