JP2742454B2 - Soldering equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a soldering device.

(Prior art and problems to be solved) Solder as a brazing alloy having a low melting point is used in a wide range, and in particular, each element disposed on a printed circuit board of an electronic device component, a connection terminal, and the like. It is indispensable to connect various switches and lead wires (hereinafter simply referred to as "electric wires"). For example, as shown in FIG. 15, when a core wire (twisted wire) 22 of an electric wire 21 is connected to a connection terminal 20 of a switch or the like by a solder 23, the core wires 22 are aligned as neatly as possible, and the cross section shown in FIG. It is preferable to connect them in the shape of a kamaboko as shown in FIG.

By the way, when a large number of elements arranged on a printed circuit board are soldered to a printed wiring, a soldering process is automated, but an electric wire is connected to the terminal 20 as described above.
At present, the step of soldering 21 is performed manually. This is because, after the soldering iron is applied to the terminal 20 with the core wire 22 of the electric wire 21 pressed against the terminal 20 to melt the solder, the connection between the terminal 20 and the core wire 22 moves until the molten solder solidifies. It is a big factor that it is necessary to keep it in place. Therefore, since the connection points are manually soldered one by one, work efficiency is poor. Moreover, if the "trowel" is strongly pressed against the core wire 22 at the time of connection as shown in FIG. 17, the core wire 22 may fall apart and protrude, and may come into contact with other components.

In addition, soldering is difficult besides, the melting state of the solder differs slightly depending on the wire and the material of the work to be connected,
Adhesion failure such as so-called "Imohan" is apt to occur, and considerable skill is required in order to connect electrically and mechanically well and evenly to each connection point.

Further, since the soldering iron is always in a heated state, it is inevitably overheated, which adversely affects the melting of the solder. Furthermore, since the gas generated due to the paste at the time of soldering is harmful, it is necessary to prevent the gas from being absorbed, and it is necessary to pay sufficient attention to ventilation.

The present invention has been made in view of the above points, and has as its object to provide a soldering apparatus that can automate soldering.

(Means for Solving the Problems) In order to achieve the above object, a soldering apparatus according to the present invention provides an electrode and a support member which are arranged to be spaced apart from each other and a cooling liquid for at least one of the electrode and the support member. Forced cooling means for forcibly cooling constantly by using one of the electrodes and the support member, and moving one of the electrodes and the support member toward the other, and pressurizing and clamping wires and works to be connected to each other between the electrode and the support member. Means, and a power supply for energizing and heating the electrodes for a predetermined time against forced cooling from the forced cooling means so as to melt the solder connecting the wires and the work while the wires and the work are held under pressure. And the driving means ends the heating of the electrodes,
After the molten solder is cooled and solidified by the forced cooling means, the molten solder is moved to be separated from the other of the electrode and the supporting member.

Preferably, the electrode has a recess in an abutting surface with the electric wire for receiving the electric wire and determining the appearance of the soldered portion.

(Operation) One of the electrode and the support member is moved by the driving means,
When the wire and the work to be connected to each other are pressurized and sandwiched between the electrode and the support member, the power supply energizes the electrode for a predetermined time against the cooling by the forced cooling means, and thereby the wire and the work are heated. Is supplied to at least one of them. When the energization of the electrodes is completed, the molten solder is rapidly cooled by the forced cooling means and solidifies, and the soldering of the electric wires and the work is completed. Thereafter, the driving means moves one of the electrode and the support member in the opposite direction to release the electric wire and the work under pressure. At this point, the soldered electric wire and the work are removed.

When the above-described concave portion is formed in the electrode, the external shape of the soldered portion of the electric wire and the work becomes a fixed shape due to the concave portion.

Embodiment An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a soldering device for carrying out the present invention.
The soldering device 1 includes an electrode 3 disposed on a frame 2,
It comprises a pressing member 4, an air cylinder 5, a power supply 6, and the like. The electrode 3 is vertically fixed to the base of the frame 2 by an electrode holder 7 with its tip directed upward, and the pressing member 4 is disposed above the electrode 3 so as to face the electrode. The pressing member 4 can be moved up and down by the expansion and contraction of a cylinder 5 fixedly supported on the frame 2, and cooperates with the electrode 3 to press and clamp the electric wire to be connected and the work.

As shown in FIG. 2, the electrode 3 is provided with a groove (mold) 3b having a semicircular cross section at the tip 3a. The inside diameter of the groove 3b is slightly larger than the outside diameter of the core wire 22 (indicated by a two-dot chain line) of the electric wire 21 to be connected, and when soldering, as shown in FIG. In a state where the core wire 22 arranged in the groove 3b is pressed, the core wire 22 is pressed and supported densely in a semi-cylindrical shape. The tips of both sides 3c and 3d of the electrode 3 are connected to a power supply 6. The electrode members include, for example, tungsten (W) and molybdenum (Mo).

As described above, the pressing member 4 is for pressing and holding the work and the electric wire to be connected in cooperation with the electrode 3, and is formed of, for example, a metal member having good heat conductivity, and has a jacket ( (Not shown), and a cooling water inlet 4a and an outlet 4b communicating with the jacket are provided. These inlet 4a and outlet 4b are connected to a cooling water supply source (not shown). The pressing member 4 is constantly forcibly cooled by cooling water circulating in the jacket, and forcibly cools the solder to be melted through the end face 4c to rapidly solidify.

The air cylinder 5 is connected to an air supply source (both not shown) via an air hose.
It is possible to adjust the pressing force in the range of g / cm ² .

As the power supply 6, for example, a commercial AC power supply of 200V, 50 cycles is used, and an applied voltage, an applied current, an applied time, and the like can be arbitrarily adjusted according to an electric wire to be connected and a type of a work. . Thus, the soldering temperature can be set to an arbitrary temperature, and can be adjusted to an optimum temperature according to the work.

 The operation will be described below.

First, as shown in FIG. 4, the core wire 22 of the electric wire 21 is placed in the groove 3b of the electrode 3 with the pressing member 4 moved upward. In addition, it is assumed that solder 23 is previously piled on the core wire 22 (so-called soldering). Then, the work, for example, the connection portion 26a of the connection terminal 26 provided on the substrate 25 is placed on the core wire 22. The connection terminals 26 of the substrate 25 extend on both surfaces of the substrate 25 and are integrally formed. One end, that is, the connection portion 26a is formed on one surface of the substrate 25, and the other end is formed on the other surface.

Next, the air cylinder 5 is extended, the pressing member 4 is lowered, and the end surface 4c is brought into contact with the connection terminal 26 of the substrate 25 as shown by a two-dot chain line, and the substrate 25 is pressed. That is, the pressing member 4
Presses the connecting portion 26a of the electrode 26 against the core wire 22 with a constant pressing force. Next, a predetermined current is applied to the electrode 3 for a predetermined time by the power source 6 to heat the electrode 3, and the solder
Is melted. As the solder 23 melts, the core wire 22 becomes the electrode 3
The groove 3b is formed into a kamaboko with the melting solder,
As shown in FIG. 5, the end face 3a contacts the connecting portion 26a. The time for energizing the electrode 3 is a very short time of about several cycles to about 20 cycles, depending on the melting current.

The connection terminal 26 is always forcibly cooled by the pressing member 4, and the molten solder 23 is forcibly cooled and solidified rapidly when the power to the electrode 3 ends, so that the core wire 22 is firmly connected to the connection terminal 26. Accordingly, the pressing force applied between the connection terminal 26 and the core wire 22 can be released in a very short time after the termination of the current supply to the electrode 3.

After the soldering of the connection terminal 26 and the electric wire 21 is completed, that is, after the energization of the electrode 3 is completed, the air cylinder 5 is shortened to move the pressing member 4 upward, and the connection part, that is, the core wire 22 of the electric wire 21 and the connection terminal 26 Release the pressing force between. Thus, as shown in FIGS. 6 and 7, the electric wire 21 can be connected to the connection terminal 26 in a substantially semi-cylindrical shape. Accordingly, the shape of the connection portion can be made constant, and it becomes easy to determine the quality of the connection portion by image processing or the like.

FIG. 8 shows another embodiment of the electrode 3, and the tip 3a of the electrode 3 is shown.
9 is provided with a shallow groove (mold) 3e having a rectangular cross section. According to this, the core wire 22 of the electric wire 21 can be soldered to the work 27 in a shape as shown in FIG. Can be reduced. This is useful for soldering where the height is limited.

FIG. 10 shows a plurality of, for example, three connection terminals 31 to 33 arranged on one end surface of the work 30 so as to protrude on the same plane.
The figure shows the shape of the electrode and the pressing member when the electric wires 34 to 36 are soldered at the same time, in which grooves (forms) 10b to 10d having a semicircular cross section are formed at corresponding positions on the end face 10a of the electrode 10. The pressing member 11 is a flat plate and presses the connection terminals 31 to 33 integrally. Fig. 11 shows a stepped work with different outside diameters.
40 shows the shapes of the electrode and the pressing member when three wires 34 to 36 are simultaneously soldered to a plurality of, for example, three connection terminals 41 to 43 at different heights on each surface of 40, and the end face 12a of the electrode 12
Further, the pressing member 13 is formed in a step shape according to the positions of the connection terminals 41 to 43 of the work 40. Of course, the electrode 12 is formed with semicircular grooves (molds) 12b to 12d on each stepped end surface. Further, by forming a hemispherical recess (mold) at the tip of the electrode, as shown in FIG. 12, the solder 23 raised into a hemispherical shape is used to connect the electric wire 21 to the connection portion 50a of the printed wiring 50.
Core wires 22 can also be connected.

It should be noted that the energizing current, energizing time, and the like of the electrode 3 are set to optimal values according to the shape, size, cooling state, and the like of the electrode, in addition to the type of the wire and the work to be connected as described above. Thereby, the best soldering can always be performed.

FIGS. 13 and 14 show an arrangement in which the electrode 3 itself is forcibly cooled. FIG. 13 shows the tip 3a of the electrode 3 and both sides 3c, 3d.
A cooling water passage 3f is provided therein to circulate the cooling water to directly cool the tip 3a of the electrode 3. Also,
Fig. 14 shows the cooling water jacket 1 on both sides 3c and 3d of the electrode 3.
5 and 15 are provided for cooling. As described above, the electrode 3 may be constantly cooled, and the solder to be melted immediately after the end of the energization may be rapidly cooled.

Means for forcibly cooling the electrode 3 is to reduce the cross-sectional area of the heating portion 3a 'at the tip 3a and increase the cross-sectional area of the side portions 3c and 3d as shown in FIG. A so-called heat sink may be formed. In this case, the cooling water jackets 15 and 16 are unnecessary.

Further, an air outlet may be provided near the tip 3a of the electrode 3 so as to face the tip 3a, and forced cooling may be performed by constantly blowing air to the tip 3a of the electrode 3.

Further, in the present embodiment, the case where solder is preliminarily applied to the core wire of the electric wire has been described. However, the present invention is not limited to this, and a fixed amount of solid or molten solder is supplied to the connection heated by the electrode 3. You may do so. Further, a paste or the like may be supplied in addition to the solder.

Furthermore, in this embodiment, the case where the electrode is arranged on the lower side and the pressing member is arranged on the upper side is described. However, the present invention is not limited to this. A mounting table or a support member may be arranged so that the connection between the electric wire to be connected by the electrode itself and the work is pressurized by a constant pressing force.

(Effect of the Invention) As described above, according to the present invention, in a soldering apparatus for connecting an electric wire to a work by soldering, at least one of an electrode and a support member is always forcibly cooled using a cooling liquid, Due to the differential of the driving means, the wire and the work to be connected to each other are pressed and sandwiched between the electrode and the support member,
In this state, the solder is melted by energizing and heating the electrodes for a predetermined time against the forced cooling by the power supply. After this, after the molten solder is rapidly solidified by forced cooling, the driving means releases the pressure holding of the electric wire and the work between the electrode and the support member. Therefore, the soldering device of the present invention can perform soldering quickly and always under constant conditions, and can eliminate poor connection and the like in soldering.
Furthermore, if a concave part for receiving the electric wire is formed in the electrode,
The appearance of the soldered part can be made to be a fixed shape determined by the concave part.For example, when image processing is used for inspection of the soldered part, inspection by the image processing becomes easy and work such as terminals and electric wires and This makes it possible to automate the soldering work, and with this, there are excellent effects related to soldering, such as improvement in quality and productivity and reduction in cost.

[Brief description of the drawings]

FIG. 1 is a schematic view of a soldering device for carrying out the present invention, FIG. 2 is an enlarged view of a main part of the electrode of FIG. 1, and FIG. FIGS. 4 and 5 are diagrams showing the relationship when an electric wire is soldered to a work by the soldering apparatus of FIG. 1, and FIG. 6 is a diagram showing the wire and the work after soldering shown in FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6, and FIG. 8 is an enlarged view of a main part showing another embodiment of the electrode applied to the present invention shown in FIG. FIG. 9, FIG. 9 is a cross-sectional view of a connecting portion when the electrode of FIG. 8 is used, FIG. 10 and FIG. 11 are enlarged views of a main part showing another embodiment of the electrode applied to the present invention, FIG. The figure is an enlarged perspective view of a main part showing another example of a state of soldering an electric wire and a work,
13 and 14 are enlarged views of a main part of the electrode when the electrode is directly cooled, FIGS. 15 and 17 are perspective views showing a mode of soldering an electric wire and a work, and FIG. Arrow XVI-X in the figure
It is sectional drawing which follows VI. DESCRIPTION OF SYMBOLS 1 ... Soldering device, 3, 10, 12 ... Electrode 4, ... Pressing member, 5 ... Air cylinder, 6 ... Power supply, 7 ... Electrode holder, 20, 26, 31-33, 41-43 … Connection terminals, 21 wires, 22, 34 to 36… Core wires, 23… Solder, 30, 40… Workpiece, 50… Printed wiring.

Claims (2)

(57) [Claims] An electrode and a support member arranged to face each other at a distance from each other; forced cooling means for always forcibly cooling at least one of the electrode and the support member using a cooling liquid; A driving unit that moves one of the support members toward the other and presses and holds an electric wire and a work to be connected to each other between the electrode and the support member; and the electric wire and the work are pressed and held. In the state,
A power supply for energizing and heating the electrodes for a predetermined time against the forced cooling from the forced cooling means so as to melt the solder connecting the wires and the workpiece; and A soldering apparatus, wherein after the molten solder is cooled and solidified by the forced cooling means, one of the electrode and the support member is moved to be separated from the other. 2. The soldering device according to claim 1, wherein the electrode has a recess for receiving the electric wire on a contact surface with the electric wire and determining an appearance shape of a soldering portion.