JPH0569123A - Soldering device - Google Patents

Abstract

PURPOSE:To provide a soldering device which can carry out efficient soldering of secure quality to each of works and is excellent for general purpose properties for a work without requiring skilled technique and suitable to complete automation for soldering. CONSTITUTION:The soldering device provides a movable electrode 19 capable of changing an access direction to a fixed electrode 29 and an air cylinder 17 to drive the movable electrode 19 in the direction attaching and detaching the movable electrode 19 to the fixed electrode 29 a controller to control the start and the end of holding in pressure to a work joining posture by this air cylinder 17 between fixed and movable electrodes and to control energizing heating of the movable electrode. The movable electrode consists of a main electrode body and a subsidary electrode body, these are heated by these contact resistance and a controller links to the operation of air cylinder to decide a starting period of energizing, an energizing time and to melt solder and on one hand, the terminal time to hold the joining position of works in pressure is set to a time from stop of energizing the movable electrode to the time of promotion of solidification of the molten solder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soldering device, and more particularly to a soldering device for performing soldering by using electrodes that are electrically heated.

[0002]

2. Description of the Related Art In manual soldering using a soldering iron, a heated soldering iron is applied to a joint portion obtained by superposing works on each other, that is, a work joint portion, and the work joint portion is heated. Supply solder in anticipation of time. After that, after confirming that the melted solder has sufficiently diffused to the work joining part, separate the soldering iron from the work joining part and wait for the molten solder to cool and solidify, thereby completing the soldering work. Will be done.

[0003]

The above-described soldering work using the soldering iron requires a highly skilled worker for the worker, so that a person other than the skilled worker can carry out stable quality soldering. Is very difficult. That is, if the soldering iron is improperly heated or applied to the work joining part, the diffusion of the melted solder deteriorates, resulting in so-called floating solder or potato solder, resulting in a finished appearance shape. Not only deteriorates the solder joint strength, but also causes large variations in the solder joint strength.

Further, since the work is manual work, even after the soldering iron is separated from the work joining site, until the melted solder is solidified, the works must be held so as not to move. The mutual joint portions may be deviated from desired positions and soldered, or the above-mentioned floating solder may be generated. For this reason, in the soldering work using the soldering iron, since the worker requires careful attention and highly skilled skill, not only the labor becomes excessive, but also the soldering per one time The tact time required for the work is inevitably long and productivity is poor.

Therefore, instead of using a soldering iron,
There has been proposed a soldering device that uses a pair of electrodes that generate heat when energized and that can move the electrodes in a direction in which the electrodes are brought into contact with or separated from each other. In this soldering device, the work joining part can be heated by utilizing the energization heat generation of the electrodes in the state where the work joining part described above is sandwiched between the electrodes, so that the heating of the work joining part can be electrically controlled, Stable heating is possible, and there is an advantage that the diffusion and melting of the solder with respect to the work joining site becomes good. Further, after this, even after the heat generation of the electrodes is stopped and before the molten solder is cooled and solidified, the work joining portion can be held between the pair of electrodes, so that the relative work between the works can be prevented. There is no deviation in the proper position. Therefore, if the above-described soldering device is used, stable soldering quality can be secured without requiring skill.

However, although the proposed soldering apparatus can carry out a stable soldering operation as compared with the case of using a soldering iron, there are cases where the soldering apparatus cannot be used depending on the shape of the work. .. That is, when using a soldering iron, the soldering iron can be accessed from any direction with respect to the work joining part, but in the case of the above soldering device, the direction of contact and separation of the pair of electrodes Therefore, when attempting to solder the work joining parts, for example, if a protrusion extends in the electrode contacting / separating direction from any work, these works, that is, the work joining part is Therefore, the soldering work cannot be performed as a result.

The present invention has been made based on the above-mentioned circumstances, and it is an object of the present invention to improve the proposed soldering apparatus and to perform stable soldering without requiring skill. Of course, it is an object of the present invention to provide a soldering apparatus which is excellent in versatility for various works and which is also suitable for automation of soldering work.

[0008]

In the soldering apparatus of the present invention, a fixed electrode, a movable electrode spaced apart from the fixed electrode, and a guide for moving the movable electrode in and away from the fixed electrode are provided. Guide means, direction changing means for changing the guide direction of the movable electrode by the guide means, the movable electrode is driven along the guide direction, and the workpieces to be soldered are fixed between the fixed and movable electrodes. Pressurizing means for sandwiching the work joining portion obtained by overlapping and pressurizing the work joining portion with a predetermined pressing force, a power supply circuit for energizing and heating one of the fixed and movable electrodes, and a power supply The circuit is provided with control means for controlling the energization of one of the electrodes by the circuit and for deciding an end time of pressing and pinching the work joining part by the pressing means.

And, in the soldering apparatus of the present invention,
A main electrode body that is used for pressurizing a work joining part by cooperating the one electrode with the other electrode, and an auxiliary electrode body that is a separate body from the main electrode body that is in contact with the tip of the main electrode body. Consisting of
The power supply circuit energizes one of the electrodes through a contact surface between the main electrode body and the auxiliary electrode body, and a main circuit that causes the main electrode body to generate heat by the contact resistance between these electrode bodies, and the main circuit. It consists of a circuit and an auxiliary circuit that connects the other electrode.

Further, the control means determines the start timing of the energization heat generation of one electrode by the power supply circuit in conjunction with the operation of the pressurization means, and at the same time, maintains the energization heat generation for a predetermined first time. To control the power circuit,
As a result, the work joining portion in the state of being pressed and sandwiched between the fixed and movable electrodes is heated so that the solder supplied to the work joining portion is melted. And
The control means further sets the pressing and pinching end time of the work joining part after a lapse of a predetermined second time after the solidification of the molten solder is promoted after the energization of one electrode is stopped.

[0011]

According to the above-described soldering apparatus, the work joining portions of the works to be soldered can be sandwiched and held between the fixed electrode and the movable electrode with a predetermined pressing force. When one of the electrodes is energized to generate heat, the work joining portion is heated. Here, since the energization heat generation of one of the electrodes is set to the predetermined first time,
The heating of the work joining part becomes stable, and the melting and diffusion of the solder supplied to the work joining part becomes good. After this, even if one of the electrodes is de-energized, the predetermined second
During the time, since the work joining part is pressed and sandwiched between the fixed and movable electrodes, it is possible to wait for the solidification of the molten solder without causing the relative displacement of the works, and to stabilize the solder. Can be attached.

In the soldering apparatus of the present invention, the guide direction of the movable electrode by the guide means can be changed by the direction changing means, so that the access direction of the movable electrode with respect to the work joining portion can be set according to the shape of the work. Therefore, regardless of the shape of the work, the work joining part can be pressed and sandwiched between the fixed electrode and the movable electrode to perform the above-described soldering work, and the versatility of the work is excellent.

One electrode is composed of a main electrode body and an auxiliary electrode body, and the contact resistance between these electrode bodies is used to
Since heating of the electrodes is carried out by heating, heating of one of the electrodes is carried out quickly. Moreover, the heating of this electrode is possible even if the electrode is not electrically connected to the other electrode via the work joining portion. Therefore, in the case of the soldering apparatus of the present invention, regardless of whether or not the work is a conductor, before the work joint part is sandwiched between the fixed and movable electrodes, the energization heat generation of one electrode is prevented. As a result, it is possible to shorten the time required to heat the work-joint site after the work-joint site is pressed and clamped, and to reduce the takt time required for one soldering operation. It can be shortened.

Further, the control means determines the start timing of the energization and heat generation of the one electrode by the power supply circuit in conjunction with the operation of the pressurizing means, and at the same time, maintains the energization of the electrode for a predetermined first time, and thereafter The timing for ending the pressing and pinching of the work joining part by the pressing means is set to the predetermined second time after the energization of the electrodes is stopped. Therefore, for example, the soldering apparatus of the present invention and the automatic supply / discharge of the work are performed. When combined with an apparatus, automation of all processes from supply of the work to soldering work and discharge of the work after completion of soldering can be automated. That is, with respect to the soldering apparatus of the present invention, the time when the workpieces are positioned and supplied at predetermined positions with the help of the automatic workpiece feeding / discharging apparatus, the soldering apparatus of the present invention, If the operation start time of the pressure means is reached, the process from the pressing and clamping of the work joining part by the pressing means to its release can be automated, and at the same time the work joining part is released by the pressing means and the soldering is completed. The workpieces can be discharged from the soldering device by the work supply / discharge device.

Preferably, the soldering apparatus preferably comprises cooling means for forcibly cooling the fixed and movable electrodes at least after the energization of the electrodes is stopped, and such a cooling means is provided. If so, the second time can be set shorter, and the tact time described above can be further shortened.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Referring to FIGS. 1 and 2, the whole of the soldering apparatus is schematically shown. This soldering apparatus is provided with a base 1, on which a support post 2 made of a plate material is erected. A pair of support arms 3 are provided above the support posts 2 at a predetermined height and sandwich the support posts 2. The pair of support arms 3 is, as is clear from FIG.
While extending horizontally while facing each other,
It is attached to the support post 2 so as to be horizontally movable. That is, in the illustrated embodiment, a pair of upper and lower guide rails 4 and 5 serving both as a horizontal movement guide and a support for the horizontal movement of the support arm 3 are fixed to both side surfaces of the support post 2, while the support is provided. Each arm 3 is formed with a slit-shaped guide hole 6 extending in the longitudinal direction thereof. Therefore, the pair of support arms 3 are fixed to the support post 2 after being positioned in the horizontal direction through the fixing screw 7 extending through the guide hole 6 and the support post 2.

A head guide 8 consisting of a rectangular block is attached to the tip of the support arm 3 via a horizontal pivot 9. The head guide 8 is swingable around a pivot 9, so that the inclination angle of the head guide 8 with respect to the horizontal plane can be adjusted arbitrarily. As the direction changing mechanism for adjusting the inclination angle of the head guide 8, various kinds such as one for changing the inclination angle stepwise or steplessly can be considered, but the direction changing mechanism shown in FIG. And a movable base 10 which is disposed so as to straddle the two upper guide rails 5 and which is attached so as to be movable in the longitudinal direction of the support arm 3 on the guide rails 5, and a base end of the movable base 10. Is rotatably connected, and an upper end of the support rod 13 is rotatably connected to an extension portion 11 provided on the upper portion of the head guide 8 via a bracket 12. Therefore,
In the mechanism of this embodiment, the tilt angle of the head guide 8 can be adjusted steplessly by setting the position of the movable table 10.

A guide hole 14 is formed through the head guide 8 in the axial direction thereof, and a guide rod 16 extending upward from the soldering head 15 is slidable in the guide hole 14. It is penetrated. The upper end of this guide rod 16 is connected to an actuator fixed to the extension 11 of the head guide 8, for example, a piston rod 18 of an air cylinder 17, whereby the soldering head 15 is supported by the air cylinder 17. ing.

As shown, the guide rod 16
A movable electrode 19 is provided on the soldering head 15 connected to the lower end of the. The movable electrode 19 includes a rod-shaped main electrode body 20. The main electrode body 20 is attached to the soldering head 15 via a sleeve 21, and the sleeve 21 extends through the soldering head 15. In the case of this embodiment, the main electrode body 21
Extend parallel to the guide hole 14 of the head guide 8 described above. In addition to the main electrode body 20, the movable electrode 19 is also provided with a rod-shaped auxiliary electrode body 22, and the auxiliary electrode body 22 is connected such that its tip intersects with the tip of the main electrode body 21. Thus, it is attached to the soldering head 15 via the sleeve 23 and the stay 24.

Referring to FIG. 3, the connection area of the main electrode body 20 and the auxiliary electrode body 22 is shown in an enlarged manner. As is apparent from FIG. 3, the tip portion of the main electrode body 20 protruding downward from the sleeve 21 has a large diameter portion 2 from the sleeve 21 side.
5 and an integrated small diameter portion 26 having a reduced diameter with respect to the large diameter portion 25. A connection hole 27 is formed in the large-diameter portion 25 of the main electrode body 20 on the side of the small-diameter portion 26, and the axis of the connection hole 27 has its bottom oriented toward the small-diameter portion 26 side. It is inclined with respect to the axis of the body 21.

On the other hand, the tip portion 28 of the auxiliary electrode body 22 protruding from the sleeve 23 toward the main electrode body 20 has the same diameter as the diameter of the connection hole 27, and the tip surface is , And has a shape matching the bottom surface of the connection hole 27. Therefore, the tip portion 28 of the auxiliary electrode body 22 is connected to the connection hole 2
7, the tip surface of the auxiliary electrode body 22 and the bottom surface of the connection hole 27 are in close contact with each other, whereby the main electrode body 20 and the auxiliary electrode body 22 are contacted via these contact surfaces.
An electrical connection between is established.

The electrical connection between the main electrode body 20 and the auxiliary electrode body 22 is not limited to the one in which the tip portion 28 of the auxiliary electrode body 22 is inserted into the connection hole 27 of the main electrode body 20. The auxiliary electrode body 22 may simply be brought into contact with the main electrode body 20. A rod-shaped fixed electrode 29 extending in the vertical direction is arranged below the movable electrode 19, and the fixed electrode 29 is also attached to the holder 31 via a sleeve 30. From this holder 31, a guide rod 32 extends in parallel with the support arm 3 described above,
The guide rod 32 extends through a clamp 33 fixed on the base 1, and is supported by the clamp 33. This clamp 33 is a guide rod 32.
Can be fixed at any position in the axial direction, whereby the horizontal position of the holder 31 or the fixed electrode 29 with respect to the movable electrode 19 can be adjusted.

As the material of the above-mentioned main electrode body 20, auxiliary electrode body 22 and fixed electrode 29, for example, a material such as molybdenum, tungsten, or a tungsten alloy which is hard to be wetted by solder is used. Yttrium, thorium, cerium, zirconium Tungsten containing the like is preferred. In the case of this embodiment, the sleeve 2 described above
Each of 1, 2, 30 is configured as a water jacket. Therefore, these sleeves 21, 23, 3
Although not shown in the drawing, a flow path for flowing cooling water is formed along the outer peripheral surface of the corresponding electrode body or fixed electrode 29, and the outer surfaces of the sleeves 21, 23 and 30 are provided with cooling water. A water supply port 34 and a water discharge port 35 are provided respectively. These supply ports 34 are connected to a cooling water supply source (not shown) via a flexible supply tube 36, while each discharge port 35 is connected.
Is connected to a return tank (not shown) via a flexible return tube 37. Therefore, the cooling water supplied from the supply source is
Can flow through the interior of the main electrode body 2
0, the auxiliary electrode body 22 and the fixed electrode 29 can be cooled at the same time.

Referring to FIG. 4, there is shown a control circuit 38 of the soldering apparatus. The control circuit 38 has a power supply for energizing the above-mentioned main electrode body 20, auxiliary electrode body 22 and fixed electrode 29. A circuit 39 is included. First, the power supply circuit 39 will be described. The power supply circuit 39 includes a transformer 40, and the transformer 40 has a primary coil 41 and a secondary coil 42. Secondary coil 4
One end of 2 is connected to the main electrode body 20 of the movable electrode 19 via a conductive wire 43, and the other end of the secondary coil 42 is connected to the auxiliary electrode body 22 of the movable electrode 19 via a conductive wire 44. Has been done. Further, the fixed electrode 29 is connected to the conductive wire 44, that is, the other end of the secondary coil 42, via the conductive wire 45.

On the other hand, both ends of the primary coil 41 of the transformer 40 are connected to the controller 46 of the control circuit 38. Although not shown, the controller 46 is connected to, for example, an AC power source of 50 Hz, which allows an AC voltage to be applied to both ends of the primary coil 41 of the transformer 40 from the AC power source via the controller 46. ing. Therefore, when the AC power supply voltage is applied to both ends of the primary coil 41, the boosted AC voltage is applied to both ends of the secondary coil 42 of the transformer 40, whereby the main electrode body 20 and the auxiliary electrode body 22 are applied. Is the conductive wire 4
A large current will flow through 3,44.

A limit switch 47 and a foot switch 49 are connected to the controller 46, and signals from these switches are supplied to the controller 46. The limit switch 47 is the movable electrode 1
9 stroke, that is, the stroke of the guide rod 16 of the soldering head 15 or the stroke of the piston rod of the air cylinder 17, and in the case of this embodiment,
As shown in FIG. 1, the limit switch 47 is
It is attached to the head guide 8. Explaining further about the operation of the limit switch 47, the limit switch 47 is turned on when the movable electrode 19, that is, the main electrode body 20 is moving toward the fixed electrode 29 by a predetermined distance or more, and the on signal is output. Supply to the controller 46.

The foot switch 49 supplies its ON signal to the controller 46 while being continuously depressed by an operator who performs a soldering operation. Further, a solder feeding device 50, a lamp 51 and an electromagnetic valve 52 for the air cinder 17 are connected to the controller 46, respectively, and their operations are controlled by the controller 46.

As shown in FIG. 5, the solenoid valve 52 is a three-port two-position directional control valve, and connects the pressure chamber 17a of the air cylinder 17 and the air pressure source 70. It is inserted in the pneumatic line 71. Therefore, when the solenoid valve 52 is switched from the illustrated rest position to the operating position, compressed air is supplied from the air pressure source 70 to the pressure chamber 17a of the air cylinder 17 through the air pressure conduit 71, whereby the air cylinder 17 moves. The piston rod is stretched against the biasing force of its return spring 17b, which results in the soldering head or movable electrode 19 being driven towards the fixed electrode 29. When the solenoid valve 52 is at the rest position shown, the pressure chamber 17a of the air cylinder 17 is
The piston rod of the air cylinder 17, that is, the movable electrode 19 is open to the atmosphere side, and therefore the return spring 1
It is returned to the initial position by the urging force of 7b.

Further, the air cylinder 1 is connected to the pneumatic line 71.
A pressure regulating valve 72 is interposed between the solenoid valve 7 and the solenoid valve 52. The pressure adjusting valve 72 is for setting a pressure capable of rising in the pressure chamber 17a of the air cylinder 17, and the set pressure can be changed by the pressure adjusting spring 73. A schematic configuration of the solder feeding device 50 described above is shown in FIG. A solder reel 55 is rotatably and detachably attached to the frame 54 of the solder feeding device 50.
A cord-shaped solder 56 is wound around the wire. The solder 56 delivered from the solder reel 55 is guided in the guide tube 57 and protrudes from the guide tube 57, and its tip end side extends to the vicinity of the fixed electrode 29.

The frame 54 is located between the guide tube 57 and the solder reel 54, and the feed roller 5
8 and a pinch roller 59 that rolls on the feed roller 58 via solder 56, respectively, are rotatably attached. The feed roller 58 is rotationally driven by a motor (not shown) capable of rotating in the forward and reverse directions.
The solder 56 is fed or wound from the solder reel 55. Therefore, the operation control of the solder feeding device 50 can be performed by controlling the forward rotation and the reverse rotation of the motor. Therefore, in this embodiment, the controller 46 is instructed to the motor of the solder feeding device 50. Will be electrically connected.

Next, the operation of the above-described soldering device will be described with reference to FIGS. 6 to 10. 6 and 7
Shows the state in which the mutual joint portions of the works to be soldered are superimposed on each other on the fixed electrode 29. In the case of this embodiment, the work on the side of one fixed electrode 29 had conductivity. It is the terminal element 60, and the other work is the conductive wire 61 to be soldered to the terminal element 60. The coating on the end of the conductive wire 61 has already been peeled off.

Furthermore, in the case of this embodiment, the terminal element 60 has a pin 62 close to the portion to which the conductive wire 61 is soldered, and this pin 62 is projected upward. .. 8 and 9 are flowcharts showing the operation procedure of the soldering apparatus, the preparation state of the soldering apparatus will be described before the description of the flowchart.

Sleeves 21, 23, 3 of the soldering device
0 is supplied with cooling water via the supply tube 36, and the supplied cooling water is supplied to the sleeve 2
1, 23, 30 are discharged through the discharge tube 37, whereby the main electrode body 20, the auxiliary electrode body 22, and the fixed electrode 29 held by the sleeves 21, 23, 30 are
It is in a cooled state.

Regarding the solder feeding device 50, as shown in FIGS. 6 and 7, when the connection portion between the terminal element 60 and the conductive wire 61 is superposed on the fixed electrode 29, the guide tube 57 is , So that the solder 56 protruding from the guide tube 57 can be supplied toward the connecting portion. As for the movable electrode 19, as shown in FIG. 7, the small-diameter portion 26 of the main electrode body 20 is adjusted by adjusting the inclination angle α of the main electrode body 20 with respect to the horizontal plane in advance as described above. The terminal element 60 is oriented so as to avoid the pin 62 of the terminal element 60 and to abut on the connecting portion between the terminal element 60 and the electric wire 61 at its tip end surface, that is, to be accessible to the connecting portion.

Further, the set pressure of the pressure chamber 17a of the air cylinder 17, which is determined by the pressure regulating valve 72 of FIG. 5, has already been adjusted according to the work to be soldered, that is, the terminal element 60 and the conductive wire 61. .. When the above-mentioned preparation is completed, the controller 46 of the soldering device is operated according to the flowcharts shown in FIGS. 8 and 9,
The soldering work will actually start.

First, in step S10 of FIG. 8, it is determined whether or not the foot switch 49 has been turned on, that is, whether or not the controller 46 has received an on signal from the foot switch 49. This foot switch 49
As shown in FIG. 6 and FIG.
9 is operated by the operator himself at the time when the positioning of the joining portion obtained by superimposing the terminal element 60 and the conductive wire 61 on each other, that is, the workpiece joining portion is completed.

Therefore, when the determination result of step S10 becomes positive (YES), the process can proceed to the next step S12, but as long as the determination result is negative (NO), the determination of step S10 is made. Is simply repeated, and the soldering apparatus is in a standby state. Therefore, in the case of this embodiment, the operation start timing of the soldering apparatus is determined by the operator.

When the determination result of step S10 becomes positive,
In step S12, the solenoid valve 52 for the air cylinder 17 is turned on by the controller 46, and the solenoid valve 5 is turned on.
2 is switched from the rest position to the operating position described above.
As a result, from the air pressure source 70 to the pressure chamber 1 of the air cylinder 17.
Compressed air is supplied toward 7a, and the pressure in this pressure chamber 17a rises. Therefore, the piston rod of the air cylinder 17 begins to expand, and as a result, the movable electrode 1
9, that is, the main electrode body 20 is driven downward toward the workpiece bonding portion held on the fixed electrode 29.

In the next step S14, the controller 4
At 6, it is determined whether or not the limit switch 47 is turned on, and until the determination here becomes positive, step S
14 is repeated. Here, step S14
When the determination result of is positive, that is, the limit switch 4
The time when 7 is turned on is the time when the piston rod of the air cylinder 17 extends a predetermined distance or more, and at this time, a predetermined distance is still present between the work joining portion and the main electrode body 20. The electrode gap G exists.

When the above-mentioned electrode gap becomes a predetermined distance or less, the limit switch 47 is turned on, and as a result, the determination result of step S14 becomes positive. This time point is indicated by t0 in FIG. Next step S1
In 6, the controller 46 turns on the transformer 40, that is, power is supplied to the primary coil 41 of the transformer 46, so that a large current is generated in the secondary coil 42 and the energization of the movable electrode 19 is started. That is, the movable electrode 19
A large current starts to flow through the main electrode body 20 and the auxiliary electrode body 22. Here, as described above, since the main electrode body 20 and the auxiliary electrode body 22 are simply in contact with each other via the contact surface, the electrical resistance value of these contact portions is large, Therefore, the main electrode body 20 begins to be rapidly heated against the cooling by the cooling water through the heat generation by the energization of the contact portion. Such contact resistance heating of the main electrode body 20 significantly shortens the time required to heat the main electrode body 20 based on the internal resistance value of the single electrode itself, as compared with the case where the electrode is energized to generate heat. be able to.

In step S16, the transformer 40
Simultaneously with the ON operation of, the timer incorporated in the controller 46 is activated, and this timer starts its counting. In the next step S18, it is determined based on the count value of the timer whether or not the elapsed time from the time when step S16 is executed, that is, the time t0 described above has reached a predetermined TS1 time (for example, 0.5 sec). The determination is made, and this step S18 is repeatedly executed until the determination result becomes positive. As shown in FIG. 10, in the process from the time t0 to the time TS1 elapses, the movable electrode 19, that is, the main electrode body 20 is brought into contact with the work joining portion at the time t1, and the work is started from the time t1. The heating of the connection site in the is substantially started. Here, the main electrode body 20
As described above, one of the workpieces, that is, the pin 62 of the terminal element 60, is abutted against the workpiece joint portion while avoiding the pin 62.

On the other hand, when the main electrode body 20 comes into contact with the work joining portion, the main electrode body 20 is electrically connected to the fixed electrode 29 via the work joining portion. Therefore,
From time t1, a current also flows through the fixed electrode 29, and the fixed electrode 29 itself also energizes and generates heat, so that the work joining portion is heated not only from the main electrode body 20 side but also from the fixed electrode 29 side. As a result, the heating becomes uniform and sufficient.

Further, after the time point t1, when the work joining portion is sandwiched between the fixed electrode 29 and the main electrode body 20, the pressure in the pressure chamber 17a of the air cylinder 17 is adjusted by the pressure regulating valve 72 described above. Is maintained at a constant pressure by the action of, and thereby, the pressing force at the connection site in the work is also maintained at a constant. Here, the pressing force of the work joining part is, for example, 2 depending on the kind and size of the work
The pressure is adjusted to an appropriate value within the range of kgf to 10 kgf, and specifically, the adjustment of the pressing force is performed by changing the spring force of the pressure adjusting spring in the pressure adjusting valve 72.

When the determination result of step S18 becomes positive,
In the next step S20, a controller 56 outputs a solder 56 command signal to the solder feeder 50. When the solder feeding device 50 receives the feed command signal, the solder feeding device 50 rotates the motor of the feed roller 58 in the forward direction, whereby the feed roller 58 and the pinch roller 59 are rotated and guided by the guide tube 57. The solder 56 is delivered from the solder reel 55, and as a result, the tip of the solder 56 that has already protruded from the guide tube 57 is delivered toward the work joining site.

The solder 56 thus delivered is
It will be melted by the work joining site that has already been heated to a predetermined temperature, and will be transferred to this work joining site. In the next step S22, the above-mentioned step 16
From the execution point of time, it is judged whether or not the value of the timer starting the count reaches T1 time (for example, 1 sec), and step S22 is repeatedly executed until the judgment result becomes positive.

When the determination result of step S22 becomes positive,
In the next step S24, the power supply from the controller 46 to the transformer 40 is turned off, and at the same time, the supply of the solder 56 by the solder supply device 50 is stopped. That is,
At the same time that the main electrode body 20 and the fixed electrode 29 are stopped from energizing and generating heat, the feeding of the solder 56 is also stopped. Therefore,
As shown in FIG. 10, in this embodiment, the solder feeding time of the solder 56 by the solder feeding device 50 TS2 (= T
1-TS1) is 0.5 sec.

The operation of turning off the transformer 40 and the solder 5
The feeding stop of 6 does not necessarily have to be performed at the same time. Further, in step S24, the count value of the timer is once cleared, and then the count is restarted.
To step S26. In step S26, after performing step S24, a predetermined rest time, that is,
It is determined whether or not TS3 time (for example, 0.1 sec) has elapsed, and if the determination result is negative, the step is repeated.

Based on the count value of the timer, step S
When the determination result of 26 is positive, in the next step S27, the controller 46 outputs a return command signal for the solder 56 to the solder feeding device 50. This return command signal causes the motor of the feed roller 58 to rotate in the reverse direction, which causes the solder 5 already protruding from the guide tube 57.
6 is returned toward the solder reel 55.

In the next step S28, it is determined whether or not the count value of the timer has reached TS4 time (for example, 0.3 sec). When the determination here becomes positive, the process proceeds to the next step S30. At this step, the returning operation of the solder 56 is stopped. That is, the reverse rotation of the feed roller 58 is stopped at this point. Accordingly, in the case of this embodiment, the feed roller 56 is (TS4-T) after the feeding of the solder 56 is stopped and after the rest period of TS3 hours is sandwiched.
S3) The time will be reversed.

As described above, if the returning operation is performed after the feeding of the solder 56, the cutting of the solder 56 from the work joining portion becomes good, but the returning operation of the solder 56 is performed. It is not always necessary.
In the next step S32, whether or not the count value of the timer has reached a predetermined T2 time (for example, 1 sec), that is,
It is determined whether or not T2 time has elapsed from the execution of step 24 described above, and this step is repeatedly performed until the determination result becomes positive.

Here, the time T2 is the time required for the molten solder transferred to the work joining portion to be sufficiently solidified after the electric heating of the main electrode body 20 and the fixed electrode 29 is completed. Here, after the energization of the main electrode body 20 and the fixed electrode 29 is finished, the main electrode body 20 and the fixed electrode 29, including the auxiliary electrode body 22, are forcibly cooled by the cooling water. Therefore, the molten solder transferred to the work joining part and this connecting part is rapidly cooled, and as a result, the T2 time can be greatly shortened.

Then, until the molten solder solidifies,
Since the work joining portion remains sandwiched between the main electrode body 20 and the fixed electrode 29, there is no deviation in the work joining portion, and therefore soldering at an accurate position can be ensured. Can be carried out. Moreover, since the work joining portion is in a state of being pressurized with a constant pressure between the main electrode body 20 and the fixed electrode 29, the soldering of the above-mentioned connecting portion is a so-called floating solder, It is possible to carry out stable quality soldering without becoming a solder.

Moreover, since the work joining portion is pressed at the same time as the heating, the molten solder supplied to the connecting portion diffuses deeply into the base material, and the joining strength after the molten solder is solidified is sufficient. It will be a big one. Furthermore, in this embodiment, the materials of the main electrode body 20 and the fixed electrode 29 are
A material having poor wettability is used for the solder 56, and since the solder 56 is directly supplied to the work joining portion, the solder 5 is applied to the main electrode body 20 and the fixed electrode 29.
6 does not adhere. Therefore, the amount of the solder 56 supplied to the work joining portion is also constant, and the appearance of the work joining portion after soldering is also good.

When the determination result of step S32 becomes positive,
In the next step S34, the controller 46 turns on the lamp 51 to notify the operator that the soldering is completed. Further, in step S34, the value of the timer described above is cleared and the counting is stopped. In the next step S36, it is determined whether or not the foot switch 49 has been turned off. That is, if the operator turns off the foot switch 49 immediately after visually recognizing the lighting of the lamp 51, the determination result of step S36 also immediately becomes positive, and the process can proceed to the next step S38.

In step S38, the solenoid valve 52 for the air cylinder 17 is switched to the rest position, and the pressure chamber 17a of the air cylinder 17 is opened to the atmosphere side and decompressed. Therefore, from this time point, the piston rod of the air cylinder 17 receives the urging force of the return spring 7b and contracts, whereby the movable electrode 19, that is, the main electrode body 20.
Starts to separate from the work joining site.

Then, in the next step S40, it is determined whether or not the above-mentioned limit switch 47 is turned off. However, immediately after step S36, that is, S38 is executed, the determination result is negative. In other words, the limit switch 47 is turned off only when the distance between the main electrode body 20 and the work joining portion reaches the electrode gap G described above in the process of contracting the piston rod of the air cylinder 17. At this point, step S4
If the determination result of 0 is positive, the process proceeds to the next step S42. In this step, the controller 46 turns off the lamp 51 and ends one soldering cycle in the soldering apparatus. After that, the soldered work is removed from the fixed electrode 29, and new works are supplied to the fixed electrode 29 to repeatedly perform soldering to the work joint portion as described above. You can

As described above, according to the soldering apparatus of this embodiment, since the work joining portion is pressed and sandwiched between the fixed electrode 29 and the main electrode body 20, the work joining portion is soldered. In attaching the work, the worker only has to hold the works together until the work joining portions are pressed and clamped, and after that, the workers can also release their hands from each other. In addition, since the work joining part is sandwiched under pressure, the heating of the connection part and the circumference of the molten solder also become uniform, so stable soldering can be performed without special skill. be able to.

In the case of this embodiment, the main electrode body 2
Since the main electrode body 20 can be energized and heated before 0 comes into contact with the work joining site, and moreover, the fixed electrode 29 and the movable electrode 19 are both forcibly cooled, so that one work joining site is soldered. The takt time required for can be greatly reduced. Further, in the soldering device of the present invention, the access direction of the movable electrode 19, that is, the main electrode body 20 with respect to the work joining portion on the fixed electrode 29 can be changed. Even if the pin 62 projects from the terminal element 60, avoid the pin 62 and avoid the fixed electrode 29.
Since the work joint part can be pressed and sandwiched between the main electrode body 20 and the main electrode body 20, there is little restriction on the shape and type of the work to be soldered, and the versatility is excellent.

Further, in the soldering apparatus of the present invention, the start and the end of the operation are determined by the foot switch 49, so the operation of the foot switch 49 is automatically supplied / discharged between the works. By having it in the equipment, the mutual supply of workpieces to the soldering equipment
It becomes easy to automate the entire process from the soldering in the soldering device and the discharging of the soldered works from the soldering device. That is, in this case, the operation of the soldering device is started when the mutual supply of the works in the automatic supply / discharge device is completed, and the automatic supply / discharge is performed at the time when the step 34 is executed. It suffices that the workpieces are mutually discharged by the device.

Normally, a non-conductive flux is applied to the work joining part, but in the soldering apparatus of this embodiment, as is clear from the above description, the main electrode of the movable electrode 19 is shown. Even if the body 20 is not electrically connected to the fixed electrode 29 through the work joining part, the main electrode body 20 can be heated, so that the main electrode body 20 is energized regardless of the presence or absence of the flux. That is, the heating is possible. Therefore, it is of course possible to heat the work joining part itself by heating the main electrode body 20 and also to activate the flux at the same time, so that a spark is generated at the work joining part during soldering. It is also possible to eliminate problems such as the surface of the soldering being rough. Further, it is possible to heat the movable electrode 19 without making electrical contact with the fixed electrode 29.
Even if the work on the side of the fixed electrode 29 is a non-conductive body such as a synthetic resin substrate, the main electrode body 20 alone can heat the connection portion and perform the soldering.

The soldering apparatus of the one embodiment is provided with the solder feeding apparatus 50. However, when the solder is previously attached to the connecting portions of the works by dip coating or the like, the solder feeding apparatus 50 is used. It can be omitted. The supply time TS2, the return time TS3 of the solder 56, the energization time T1 to the electrode, and the cooling time T2 from the end of energization to the release of the work joining portion are appropriate values depending on the type and size of the work. Is set to. However, when performing the soldering work, when the step S10 of FIG. 8 is performed in the previous work cycle and then the step S10 is performed in the next work cycle, the temperature of the movable and fixed electrodes 19, 29 is reduced. ,In particular,
Regarding the temperature of the main electrode 20, as shown in FIG.
In order to return to the initial temperature, it is preferable to set the energization time T1 and the cooling time T2. When this control cannot be achieved only by setting the energization time T1 and the cooling time T2, the supply amount of cooling water is controlled. You can do this. Further, the cooling time T2 is not necessarily limited to the time required for the molten solder transferred to the work joining portion to be completely cooled and solidified,
Before the molten solder is cooled and solidified, the main electrode body 20
May be separated from the work joining site. By doing so, it is possible to further improve the finish of the solder surface at the work joining portion.

In one embodiment, one transformer 40 was used to heat the movable and fixed electrodes 19 and 29 by energization. However, as shown in FIG. The fixed electrode 29 may be electrically heated by a transformer. In this case, the movable electrode 19
Since it is possible to independently control the energization and heating of the fixed electrode 29 and the fixed electrode 29, it is suitable when the heat capacities of the works are different from each other.

Further, when the heat capacity of the work on the fixed electrode 29 side is large, the fixed electrode 29 side is also made to have the same structure as the movable electrode 19 and the fixed electrode 29 is formed by contact resistance heating.
The energization heating may be performed. Finally, the means for changing the access direction of the movable electrode 19, that is, the main electrode body 20 with respect to the fixed electrode 29, and the means for driving the movable electrode are not limited to those shown in the drawing, but can be variously modified. Of course.

[0064]

As described above, according to the soldering apparatus of the present invention, the access direction of the movable electrode with respect to the fixed electrode can be changed, so that the movable electrode can be moved regardless of the shape and type of the work. It is possible to press and sandwich the work joining portion between the electrode and the fixed electrode, and the versatility of the work is excellent. Further, when the work joining part is heated and soldered between the fixed and movable electrodes, the work joining part is in a state of being sandwiched under pressure between the electrodes, so that the work joining part may be inadvertently moved. In addition, stable quality soldering can be performed without requiring skill. Furthermore, since one of the movable and fixed electrodes is heated by contact resistance heat generation,
It is possible to quickly heat the work joining part, and it is possible to greatly reduce the takt time. Moreover, since the operation of the soldering apparatus of the present invention can be electrically controlled, it has an advantage that it is suitable for automating all steps required for soldering work.

[Brief description of drawings]

FIG. 1 is a side view of a soldering device according to an embodiment.

FIG. 2 is a front view of the soldering device of FIG.

FIG. 3 is an enlarged view showing a movable electrode tip portion partially broken away.

FIG. 4 is a schematic diagram showing a control circuit of the soldering device.

FIG. 5 is a schematic view showing a pneumatic circuit of an air cylinder.

FIG. 6 is a front view of the vicinity of an electrode showing a state where works are supplied to a fixed electrode.

FIG. 7 is a side view of the vicinity of the electrode showing a state where the works are supplied to the fixed electrode.

8 is a part of a flowchart showing a soldering procedure executed by a controller of the control circuit of FIG.

9 is a flowchart showing the rest of the soldering procedure of FIG.

FIG. 10 is a time chart showing an operating state of each part of the soldering device.

[Explanation of symbols]

 2 Support Post 3 Support Arm 8 Head Guide 13 Support Rod 15 Soldering Head 16 Guide Rod 17 Air Cylinder 19 Movable Electrode 20 Main Electrode Body 22 Auxiliary Electrode Body 29 Fixed Electrode 38 Control Circuit 40 Transformer 46 Controller 47 Limit Switch 49 Foot Switch 50 Solder feeder 51 Lamp 52 Solenoid valve

Claims (1)

[Claims] 1. A fixed electrode, a movable electrode arranged apart from the fixed electrode, a guide means for guiding the movable electrode in a direction of approaching and separating the fixed electrode, and a guide of the movable electrode by the guide means. A direction changing means for changing the direction and a movable electrode are driven along the guide direction to sandwich a work joining portion obtained by overlapping works to be soldered between the fixed and movable electrodes, and Pressurizing means for pressurizing the work joining portion with a predetermined pressing force, a power supply circuit for energizing and heating one electrode of the fixed and movable electrodes, and one for controlling energization of one electrode by the power supply circuit A control means for determining an end time of pressing and pinching the work joining part by the pressing means, wherein the one electrode cooperates with the other electrode to press and pinch the work joining part. Offered to The main electrode body and the auxiliary electrode body that is separate from the main electrode body that is in contact with the tip of the main electrode body are provided. The main circuit that energizes through the contact surface of the main body and heats the main electrode body due to the contact resistance between the electrode bodies, and an auxiliary circuit that connects the main circuit and the fixed electrode. In conjunction with the operation of the pressurizing means, the power supply circuit is used to determine the time at which the one of the electrodes starts energization and heat generation, and this energization is maintained for a predetermined first time so that the fixed and movable electrodes are placed under pressure. A certain work joining part is heated to melt the solder supplied to the work joining part, while the control means sets the pressing and clamping end time of the work joining part from the stop of energization of one electrode to solidification of the molten solder. Installation after a predetermined second time Soldering apparatus characterized in that it.