JP2001096370A - Resistance welder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resistance welder capable of obtaining less electrode pressure than pressurizing force by the weight of the electrode pressure supply mechanism and thermo-compression bonding or spot welding the object to be welded by decreasing or increasing the electrode pressure during welding. SOLUTION: This welder for thermo-compression bonding or spot welding is equipped with an upper slider which is driven to the object to be welded, a lower slider which is sliddably held with the upper slider, an electrode, a stopper, a pressing means which presses the lower slider to the object, and a pressing force control means which abuts on the stopper before the electrode abuts on the object following the move of the lower slider and presses the lower slider to the direction opposite to the object.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistance welding apparatus for performing thermocompression bonding or spot welding of a very small conductor wire or a conductor component to a terminal portion of an electronic component or various sensors with a minimal electrode pressing force.

[0002]

2. Description of the Related Art Conventionally, as a method of fixing a conductor wire or a conductor component (hereinafter, collectively simply referred to as a workpiece) to a terminal portion of an electronic component or various sensors, the workpiece is pressurized with an electrode. There are a thermocompression bonding method in which a welding current is applied while the electrodes are heated to a high temperature to press the objects to be welded together by the heat, and a spot welding method in which the welding current is applied by pressing the objects to be welded between the electrodes. Hereinafter, these methods are collectively referred to simply as resistance welding.

[0003] The control of the electrode pressing force in resistance welding when the conductor wire to be welded is, for example, a fine wire of several tens of microns or a conductor component of a very small size is a very important condition for ensuring welding quality. It is. For this reason, the mechanism for obtaining the pressing force of the electrode has been made as small and lightweight as possible.

[0004]

In the conventional method for reducing the electrode pressing force supply mechanism to be as small and light as possible, the weight of the electrode pressing force supply mechanism itself is added to the electrode pressing force. The current situation is that an electrode pressing force smaller than the weight of the pressure supply mechanism cannot be obtained, and resistance welding of a workpiece requiring an extremely small electrode pressing force cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is a resistance welding apparatus capable of performing thermocompression bonding or spot welding of a very small conductor wire or conductor part with a very small electrode pressing force. The purpose is to provide.

[0006]

A first means of the present invention is as follows.
An upper slider that is driven in the direction of the workpiece, a lower slider that is slidably held with respect to the upper slider, an electrode that is attached to the lower slider, and that contacts the workpiece, and an upper slider and a lower slider. Urging means for urging the lower slider provided between the sliders in the direction of the workpiece; a locking portion provided on the lower slider; and a locking portion until the electrode contacts the workpiece when the lower slider is moved. And a biasing force control means for biasing the lower slider in a direction opposite to the workpiece to be welded.

[0007] The second means of the present invention, as the urging means,
An elastic body is arranged between the upper slider and the lower slider.

[0008] A third means of the present invention is characterized in that a lower slider is provided with a portion for preventing the lower slider from coming off from the upper slider.

According to a fourth aspect of the present invention, as an urging force control means, a contact end for contacting the locking portion, a biasing end for biasing in the direction of the workpiece, a contact end, A lever portion having a fulcrum provided between the ends is provided.

The fifth means of the present invention is a biasing force control means, wherein the contacting end for contacting the locking portion, the biasing end for biasing the workpiece in the opposite direction, and the contacting end. A lever portion provided with a fulcrum outside the biasing end.

A sixth means of the present invention is characterized in that a driving means for controlling an urging force of the urging means in the direction of the workpiece is provided.

[0012] A seventh means of the present invention is that the driving means comprises:
A motor, a screw rotated by the motor, and a screw portion screwed to the screw and held by an upper slider are provided.

[0013] An eighth means of the present invention is that, as the driving means,
An electromagnetic valve, a cylinder controlled by the electromagnetic valve, and a joint joined to the cylinder and held by an upper slider are provided.

A ninth aspect of the present invention is characterized in that a workpiece detection means for detecting that the tip of the electrode attached to the lower slider has contacted the workpiece is provided.

According to a tenth aspect of the present invention, as a workpiece detection means, a displacement sensor held by an upper slider for detecting a gap between an upper part slider and a slip-off preventing part interlocked with the elevation of an electrode, and a nuclear displacement sensor. And a displacement measuring section for calculating the workpiece detection signal into a displacement.

The eleventh means of the present invention is characterized in that a displacement measuring means for measuring a displacement of a thickness of the workpiece when welding the workpiece is provided.

According to a twelfth aspect of the present invention, as a displacement amount measuring means, a displacement sensor held by an upper slider for detecting a gap between an upper part slider and a slip-off preventing part interlocked with the elevation of an electrode, and a signal from a nuclear displacement sensor And a displacement measuring unit for calculating the displacement as a displacement.

According to a thirteenth aspect of the present invention, a single displacement sensor is used as the workpiece detecting means and the displacement measuring means, and a displacement signal from the displacement sensor when the workpiece contacts the workpiece is provided. And a displacement measuring section for separating and outputting a displacement signal from the displacement sensor when the workpiece is welded.

According to a fourteenth aspect of the present invention, the displacement sensor is a differential transformer type displacement sensor.

According to a fifteenth aspect of the present invention, the displacement sensor is an optical displacement sensor.

According to a sixteenth aspect of the present invention, there is provided an operation unit for inputting an urging force to an object to be welded as an electrode pressing force, and a control unit for calculating the electrode pressing force as a moving amount of the driving means. And

A seventeenth means of the present invention is a control section for driving the driving means in the minus direction when the pressure of the electrode is reduced, and the driving means in the plus direction when the pressure is increased. And an operation unit.

The eighteenth means of the present invention is characterized in that a temperature sensor for detecting the temperature of the electrode and a temperature measuring section are provided.

A nineteenth means of the present invention is characterized in that a cooling means for cooling the electrodes is provided.

A twentieth means of the present invention is characterized in that a cooling pipe for moving compressed air from at least one direction to the electrode is provided as the cooling means.

A twenty-first means of the present invention is characterized in that a displacement measuring section measures the displacement of the thickness of the workpiece during and after welding, and judges the quality of the welding result.

The twenty-second means of the present invention is characterized in that the temperature of the electrode during welding is measured by a temperature measuring section, and the quality of the welding result is determined.

The twenty-third means of the present invention is characterized in that a welding current during welding is measured by a welding current measuring unit, and the quality of the welding result is determined.

A twenty-fourth aspect of the present invention is characterized in that the temperature of the electrode is measured by a temperature measuring section, and an output signal at a certain temperature or lower is used as a starting condition of the apparatus.

According to a twenty-fifth aspect of the present invention, a type of an object to be welded is input to an operation unit, and an electrode pressing force and
The method is characterized in that the pressure of the electrode is reduced or increased during and after welding, the thickness of the workpiece is determined, the temperature of the electrode is determined, and the determination of the welding current is switched.

According to a twenty-sixth aspect of the present invention, a locking portion provided on the lower slider, a portion for preventing the lower slider from coming off from the upper slider, and a fulcrum between the abutting end and the urging end as urging force control means. The lever portions provided with are arranged symmetrically.

According to a twenty-seventh aspect of the present invention, one of two output welding current cables from a welding power source is connected to an electrode,
The other one is connected to the above-mentioned electrode, a welding current is passed, and a thermocompression bonding method in which a nuclear electrode is used as a hot electrode, and one of two welding current cables for output from a welding power source is connected to an upper electrode. The other is connected to a lower electrode different from the above-mentioned electrode, and a welding method switching unit of a spot welding type in which a welding current flows is provided.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to a first aspect of the present invention, an upper slider driven in the direction of a workpiece, a lower slider slidably held with respect to the upper slider, and a lower slider Mounted on the electrode to be brought into contact with the workpiece, an urging means for urging the lower slider provided between the upper slider and the lower slider in the direction of the workpiece, a locking portion provided on the lower slider, Since the lower slider is provided with an urging force control means for abutting the locking portion until the electrode abuts on the workpiece during movement of the lower slider, and biasing the lower slider in a direction opposite to the workpiece, the electrode pressing force is extremely small. Thus, the effect that the workpiece can be pressurized can be obtained.

In the second means, an elastic body is disposed between the upper slider and the lower slider as a biasing means.
The effect that the structure is simple and inexpensive can be obtained.

According to the third means, since the lower slider is provided with a part for preventing the lower slider from coming off from the upper slider, an effect is obtained that the elastic body of the urging means can expand and contract after coming into contact with the workpiece.

The fourth means is an urging force control means, which is a contact end for abutting against the locking portion, a biasing end for biasing in the direction of the workpiece, and between the contact end and the biasing end. Since the lever is provided with a fulcrum, the weight of the electrode and the lower slider is balanced by the weight, so that the weight of the electrode and the lower slider does not apply to the workpiece after abutting on the workpiece. In addition, the function of controlling the pressing of only the expansion and contraction of the elastic body of the urging means can be obtained.

Fifth means is a biasing force control means, a contacting end for contacting the locking portion, a biasing end for biasing the workpiece in the opposite direction, and a biasing force as viewed from the contacting end. Since the fulcrum is provided outside the end, the weight of the electrode and the lower slider is balanced by the weight, so that the weight of the electrode and the lower slider does not apply to the workpiece after abutting on the workpiece. In addition, the function of controlling the pressing of only the expansion and contraction of the elastic body of the urging means can be obtained.

The sixth means is provided with a driving means for controlling the urging force in the direction of the workpiece to the urging means, so that the pressing force of the electrode, the pressing speed, and the pressing time can be controlled. Is obtained.

A seventh means is a pressing force of an electrode provided with a motor as a driving means, a screw rotated by the motor, and a screw portion screwed to the screw and held by an upper slider. In addition, an effect that the pressurizing speed and pressurizing time can be controlled at high speed can be obtained.

Eighth means is an electrode provided with an electromagnetic valve, a cylinder controlled by the electromagnetic valve, and a joint joined to the cylinder and held by an upper slider, as a driving means, and a pressure and pressure of an electrode. The effect that the speed and the pressurization time can be controlled is obtained.

The ninth means is provided with a workpiece detecting means for detecting that the tip of the electrode attached to the lower slider has come into contact with the workpiece, so that pressurization and start control of welding can be performed. Is obtained.

The tenth means is a means for detecting an object to be welded, a displacement sensor held by an upper slider for detecting a gap between an upper part slider and a slip-off preventing part interlocked with the elevation of an electrode, and a welding sensor from a nuclear displacement sensor. The provision of the displacement amount measurement unit for calculating the object detection signal into the displacement amount provides an effect that the pressurization and the start of welding can be controlled and the thickness of the workpiece before welding can be measured.

In the eleventh means, the displacement measuring means for measuring the displacement of the thickness of the workpiece when the workpiece is welded is provided, so that the thickness of the workpiece during welding can be measured. Is obtained.

The twelfth means is a displacement amount measuring means.
A displacement sensor held by the upper slider that detects the gap between the slip prevention unit and the upper slider that is linked to the elevation of the electrode, and a displacement measurement unit that calculates the signal of the nuclear displacement sensor into the displacement are provided. The effect that the thickness of the object to be welded can be measured is obtained.

The thirteenth means uses a single displacement sensor as the workpiece detection means and the displacement measuring means, and uses the displacement signal from the displacement sensor at the time of contact with the workpiece and the workpiece signal. Is provided with a displacement measuring unit that separates and outputs a displacement signal from the displacement sensor at the time of welding, so that an effect that the structure can be simplified and inexpensive can be obtained.

In the fourteenth means, since the displacement sensor is a differential transformer type displacement sensor, an effect is obtained that the displacement sensor is not affected by a magnetic field generated during welding.

According to the fifteenth means, since the displacement sensor is an optical displacement sensor, an effect is obtained that the displacement sensor is not affected by a magnetic field generated during welding.

The sixteenth means is provided with an operating section for inputting the urging force to the workpiece as an electrode pressing force and a control section for calculating the electrode pressing force to the amount of movement of the driving means. The effect that numerical values can be managed can be obtained.

The seventeenth means is to press the electrode on the work to be welded,
When the pressure of the electrode is reduced, the control unit and the operation unit are provided to drive the driving means in the minus direction when the pressure is reduced, and the driving means in the plus direction when the pressure is increased, so that the welding quality of the workpiece can be stabilized. Action is obtained.

Since the eighteenth means is provided with a temperature sensor for detecting the temperature of the electrode and a temperature measuring section, an effect is obtained that the welding quality of the workpiece can be stabilized.

In the nineteenth means, since the cooling means for cooling the electrodes is provided, an effect is obtained that the welding quality of the workpiece can be stabilized.

In the twentieth means, as the cooling means, a cooling pipe for moving compressed air to the electrode from at least one direction is provided, so that the effect of stabilizing the welding quality of the workpiece can be obtained. .

According to the twenty-first means, the displacement of the thickness of the workpiece to be welded during and after welding is measured by the displacement measuring section, and the quality of the welding result can be determined.

According to the twenty-second means, an effect is obtained that the temperature of the electrode during welding is measured by the temperature measuring section, and the quality of the welding result can be determined.

The twenty-third means has an effect that the welding current during welding can be measured by the welding current measuring unit, and the quality of the welding result can be determined.

In the twenty-fourth means, the temperature of the electrode is measured by the temperature measuring section, and the output signal of a certain temperature or less is used as the starting condition of the apparatus. Can be lengthened.

In the twenty-fifth means, the type of the workpiece is input to the operation section, and the electrode pressing force, the pressure reduction or increase of the electrode pressure during and after welding, and the The effect of being able to switch between the determination of the displacement of the thickness of the object, the determination of the electrode temperature, and the determination of the welding current can be obtained.

In a twenty-sixth aspect, a locking portion provided on the lower slider, a portion for preventing the lower slider from coming off from the upper slider, and a fulcrum between the abutting end and the urging end as urging force control means are provided. Since the levers are arranged symmetrically, an effect that the workpiece can be pressurized with a stable and minimal electrode pressing force is obtained.

In the twenty-seventh means, one of two output welding current cables from a welding power source is connected to the electrode, and the other is connected to the electrode, and a welding current is supplied to the core electrode so that the core electrode is hot. The thermocompression bonding method used as an electrode, and one of two welding current cables for output from a welding power source is connected to the upper electrode, and the other is connected to a lower electrode different from the above electrode and welded Since the spot welding type welding method switching unit for flowing the current is provided, an operation is obtained in which one resistance welding device can perform welding of two welding types.

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a resistance welding apparatus. The upper slider 1 is driven in the direction of the workpieces 12a and 12b, and the lower slider 2 is slidably held on the upper slider 1. Attached to the lower slider 2,
An electrode 3 to be brought into contact with the workpieces 12a and 12b; a biasing means 4 for biasing the lower slider 2 provided between the upper slider 1 and the lower slider 2 in the workpiece directions 12a and 12b; The electrode 3 is connected to the workpieces 12a, 1 when the lower slider 2 moves.
The urging force control means 6 is configured to abut against the locking portion 5 before abutting against the workpiece 2b, and bias the lower slider 2 in a direction opposite to the workpieces 12a and 12b. Examples of the elastic body 4 serving as the urging means 4 include a coil spring, a plate spring, and elastic rubber.

The operation of the resistance welding apparatus shown in FIG.
Will be described with reference to the welding operation diagram of FIG. The outline of the operation process of FIG. 3 includes an electrode descending section L1, an electrode pressurizing and upsetting section L2, a forging section L3 (decreasing or increasing the electrode pressing is referred to as forging pressure), and an electrode rising section L4. First, in the electrode descending section L1, when the electrode 3 is at the origin P0 point in FIG. 3 and the motor 13 as the driving means 13 in FIG. 1 rotates in the normal direction, the screw 14 rotated by the motor 13 and the screw 14 Threaded part 1 screwed to the upper slider 1
5, an upper slider 1 driven in the direction of the workpieces 12a and 12b by a lower end, a lower slider 2 slidably held by the upper slider 1 with respect to the upper slider 1, and a lower slider 2.
The electrode 3 attached to the lower slider 2 is the origin P in FIG.
It descends at high speed from point 0 to low speed point P1 (Fig.
).

When the electrode 3 reaches the low-speed point P1 in FIG. 3, the electrode 3 descends at a low speed from the low-speed point P1 to the contact point P2 of the workpiece (FIG. 3). The reason for lowering at a low speed is to prevent the workpiece from being deformed or damaged.

Examples of the motor 13 as the driving means 13 include a servo motor, a stepping motor, an inverter motor, an induction motor and the like.

Until the electrode 3 reaches the point of contact P2 from the point of origin P0 in FIG. 3, the upper slider 1 is lowered by the slip-off prevention unit 7 connecting the upper slider 1 and the lower slider 2. For example, the lower slider 2 also descends. When the electrode 3 comes into contact with the workpieces 12a and 12b, the lower slider 2 remains in contact with the workpieces 12a and 12b, and the lower slider 2 does not descend.
It contacts the contact end 8 of the leverage 24.

When the motor 13 of the driving means 13 rotates forward, only the upper slider 1 is lowered, and the slip-off preventing portion 7 connecting the upper slider 1 and the lower slider 2 is formed.
Is disengaged from the upper slider 1, and only the upper slider 1 descends, and the slip-out preventing portion 7 presses the displacement sensor 16 which is the workpiece detection means 27. Then, the displacement sensor 16 operates to transmit the signal to the displacement measuring unit 17. Accordingly, the displacement measuring unit 17 calculates the displacement and calculates the electrode 3
Has reached the contact point P2 of the workpiece to be welded in FIG. 3 (in FIG. 3), which means that the workpieces 12a and 12b have been detected. Then, the controller 18 stores the contact point P2 of the workpiece to be welded in FIG. 3 where the electrode 3 abuts on the workpieces 12a and 12b.

Next, in the electrode pressurization and upsetting section L2, the lever 24 as the urging force control means 6 is urged in the direction of the abutting end 8 contacting the locking portion 5 and the workpieces 12a and 12b. A weight 11 connected on the biasing end 9 and a fulcrum 10 between the contact end 8 and the biasing end 9 and the weight 11. On the other hand, it is urged by the urging force control means 6 in a direction opposite to the workpieces 12a and 12b.

For example, if the total weight of the electrode 3, the lower slider 2, and the slip-off preventing portion 7 is 300 grams, this is W1, and if the weight by the urging force control means 6 is 300 grams, this is W2, and the difference is W2. Is W3. When this is represented by an equation, W1−W2 = W3, and when a numerical value is substituted, 300 is obtained.
Grams-300 grams = 0 grams.

The reason is that the electrodes 3 are connected to the workpieces 12a and 12b.
Means that the initial weight, ie, the pressing force, is 0 g when contacted with.

If the weight 1 connected on the biasing end 9
If the weight of 1 is changed to 250 grams, W1-W2 =
When W3 is substituted, 300 grams-250 grams =
50 grams.

The reason is that the electrodes 3 are connected to the workpieces 12a and 12b.
Means that the initial weight, ie, the pressing force, is 50 grams. By changing the weight of the weight 11, the initial weight, that is, the initial value of the pressing force can be changed. From this state, the motor 13 as the driving means 13 rotates in the forward rotation direction, and the workpieces 12a,
The pressing force applied in the direction 12b
Even if the motor 13 rotates in the forward direction, the lower slider 2 remains in contact with the workpieces 12a and 12b, so that the lower slider 2 does not descend in the workpieces 12a and 12b but stops. And only the upper slider 1 descends in the direction of the workpieces 12a and 12b.

That is, the pressing force of the electrode 3 applied to the workpieces 12a and 12b is only the expansion and contraction of the elastic body 4 which is the urging means 4, and the electrode 3, the lower slider 2, and the slip-off preventing portion 7
Is not applied to the workpieces 12a and 12b. Further, the upper slider 1 descends, but the lower slider 2 does not descend while the lower slider 2 remains in contact with the workpieces 12a and 12b, and the constant of the elastic body 4 (1 mm)
The upper slider 1 according to the pressure applied to the elastic body 4).
The electrode 3 to be welded 12a, 12b
The pressure applied to the contact increases proportionally.

The electrode 3 is connected to the contact point P of the work to be welded in FIG.
After an electrode pressing start delay time (including zero) elapses from two points, the electrode pressing is performed in the direction of the workpieces 12a and 12b according to the input values of the electrode pressing force and the pressing speed to the operation unit 19. This electrode pressing force is calculated as a movement amount of the motor 13 as the driving means 13. For example, the constant of the elastic body 4 is 0.1 kg / m
m (when the elastic body 4 contracts by 1 mm, the applied pressure becomes 100 grams, and when the elastic body 4 contracts by 2 mm, the applied pressure becomes 200 grams). The calculation of the movement amount of a certain motor 13 is as follows: electrode pressing force 電極 constant of elastic body 4 = moving distance, 0.15
kg ÷ 0.1 kg / mm = 1.5 mm, and the upper slider 1 is lowered by 1.5 mm. When the upper slider 1 is lowered by 1.5 mm, the elastic body 4 is contracted by 1.5 mm.
a and 12b are pressurized.

When the electrode pressurization elapses, the welding start delay time (including zero) elapses, and the welding power source 23 shown in FIG. 1 is activated to start welding. As a result, a welding current flows through the electrode 3, and the workpieces 12a and 12b are thermocompression-bonded or spot-welded. During the welding, the displacement of the thickness of the workpieces 12a and 12b is measured by the displacement measuring means 27. Displacement measuring means 2
Reference numeral 7 denotes a displacement sensor 16 held by the upper slider 1 for detecting a gap between the pull-out prevention unit 7 and the upper slider 1 that are interlocked with the elevation of the electrode 3, and a displacement measurement for calculating a signal of the displacement sensor 16 into a displacement. And 17.

It is to be noted that the displacement sensor 16 serving as the object-to-be-welded detection means and the displacement amount measuring means 27 is also used as one, and the electrode 3 is brought into contact with the object-to-be-welded 12a, 12b before welding. Signal of the displacement of the workpiece 12a, 1 during welding.
The displacement measuring section 17 separates and outputs the displacement signal from the displacement sensor 16 when the electrode 3 is in contact with the electrode 2b.

When the electrode pressurizing and upsetting section L2 of FIG. 3 is completed, the work piece 12 is welded during the welding in the forging section L3.
The displacement amounts of the thicknesses a and 12b are the displacement amount measuring units 17 at the point P3 at which the electrode pressing force starts decreasing or increasing the pressure in FIG.
(FIG. 3), a displacement amount signal is input to the control unit 18, and the forging start delay time (for which zero is also applied) for forging the electrode pressing force from the pressure reduction start point or the pressure increase start point P3 of the electrode pressing force. ) And the welding end delay time (including zero) are counted. Operation section 1 after forging start delay time has elapsed
When the forging pressure applied to 9 is smaller than the electrode pressing value, the pressure becomes the pressure reduction point P4.
The upper slider 1 is raised to a point (in FIG. 3), and the electrode pressure is reduced.

If the forging pressure applied to the operation unit 19 is larger than the electrode pressure value, the pressure increasing point P4 'in FIG.
And the pressure of the electrode 3 is increased at the forging speed P4 '(FIG. 3).
The upper slider 1 descends until the electrode pressing force increases. When the electrode 3 rises, the motor 13 is rotated in the reverse direction in the minus direction, and when the electrode 3 is lowered, the motor 13 is rotated in the forward direction in the plus direction. Then, when the welding end delay time has elapsed, the welding power source 23 is turned off and the welding is stopped.

The purpose of forging during welding is to reduce or increase the pressure in the molten state of the workpieces 12a and 12b during thermocompression bonding or spot welding, thereby increasing the pressure of the workpiece at the pressure reduction start point or the pressure increase start point P3. When the melting is excessive, the excessive melting is reduced by reducing the pressure, and when the melting is insufficient, the insufficient melting is improved by reducing the pressure to improve the quality.

After the elapse of the forging section in FIG. 3, the holding time for holding the electrode 3 is counted, and the workpieces 12a, 12a,
12b is held under pressure by forging. After the elapse of the holding time, in the electrode ascending section L4, the electrode 3 moves to the decompression point P4.
The electrode 3 rises at a low speed from the point or the pressure increasing point P 'to the low speed point P1 (-in FIG. 3), and at the low speed point P1 (FIG. 3), reaches the origin P0 point. Electrode 3
Stops rising. (~ In FIG. 3).

(Embodiment 2) A second embodiment of the present invention will be described with reference to FIG. A contacting end 8 serving as the urging force control means 6 to be brought into contact with the locking portion 5;
A biasing end 9 for urging in a direction opposite to the direction b, and a lever portion 24 having a fulcrum 10 provided outside the urging end 9 when viewed from the contact end 8. When the lower slider 2 and the electrode 3 start to descend, a wire is connected to the urging end 9 of the leverage part 24 in a state where the locking part 5 of the stopper part 7 and the contact end 8 are not in contact with each other. The wire is connected to the weight via the roller 25. When the lower slider 2 and the electrode 3 continue to descend and come into contact with the workpieces 12a and 12b, the locking portion 5 is moved to the contact end 8
And urges the contact end 8 in the direction of the workpieces 12a and 12b.

For example, if the total weight of the electrode 3, the lower slider 2, and the slip-off preventing portion 7 is 300 grams, this is W1, and if the weight by the biasing force control means 6 is 300 grams, this is W2. Is W3. When this is represented by an equation, W1−W2 = W3, and when a numerical value is substituted, 300 is obtained.
Grams-300 grams = 0 grams.

The reason is that the electrodes 3 are connected to the workpieces 12a and 12b.
Means that the initial weight, ie, the pressing force, is 0 g when contacted with.

If the weight of the weight 11 is changed to 250
W1-W2 = W3, and 300 g-250 g = 50 g when the numerical value is substituted.

This is because the electrodes 3 are connected to the workpieces 12a and 12b.
Means that the initial weight, ie, the pressing force, is 50 grams. By changing the weight of the weight 11, the initial weight, that is, the initial value of the pressing force can be changed.

(Embodiment 3) An electromagnetic valve (not shown) as the driving means 13, a cylinder (not shown) controlled by the electromagnetic valve, and a joint part joined to the cylinder and held by the upper slider Is provided. Solenoid valves and cylinders are available in pneumatic and hydraulic types.

(Embodiment 4) A case where a differential transformer type displacement sensor is used as an example of the displacement sensor 16 will be described. This is because there is no influence of a magnetic field due to welding generated at the time of welding, and the accuracy of displacement detection is high.

(Embodiment 5) This is a case where an optical displacement sensor is used as an example of the displacement sensor 16. This is because there is no influence of the magnetic field due to welding generated at the time of welding,
This is because the life of the displacement sensor is long and the accuracy of displacement detection is high.

(Embodiment 6) Since the temperature sensor 20 and the temperature measuring section 21 for detecting the temperature of the electrode 3 before and after welding and during welding are provided, the temperature control and the life of the electrode when welding the workpiece to be welded are provided. In addition, it is possible to perform control and to perform quality control during and during welding of the workpiece.

(Embodiment 7) Since the cooling means 22 for cooling the electrode 3 is provided, the electrode 3 can be cooled when the temperature of the electrode is increased by welding, and the temperature of the electrode 3 is always kept within a certain temperature range. Therefore, it is possible to prevent the welding result of the work to be welded due to the heating of the electrode 3 from being defective, and to prolong the life of the electrode 3.

(Embodiment 8) As the cooling means 22, a cooling pipe for moving compressed air from at least one direction to the electrode 3 is provided, so that the structure is extremely simple and inexpensive.

(Embodiment 9) Since the displacement of the thickness of the workpieces 12a and 12b during and after welding is measured by the displacement measuring section 17, and the quality of the welding result is determined, the welding failure is determined in advance. Can be prevented, and the welding quality can be stably and improved.

(Embodiment 10) Since the temperature of the electrode 3 during welding is measured by the temperature measuring unit 21 and the quality of the welding result is judged, welding defects can be prevented in advance and the welding quality can be stabilized. And can be improved.

(Embodiment 11) Since the welding current during welding is measured by the welding current measuring unit 28 and the quality of the welding result is judged, welding defects can be prevented in advance, and the welding quality can be stabilized and stable. Can be improved.

(Embodiment 12) Since the temperature of the electrode 3 before welding is measured by the temperature measuring section 21 and an output signal below a certain temperature is used as a starting condition of the apparatus, welding defects can be prevented in advance. And the welding quality can be stably and improved.

(Embodiment 13) Workpieces 12a, 12
The type of b is input to the operation unit 19, and the electrode pressing force, the reduction or increase of the electrode pressure during and after welding, and the displacement amount of the thickness of the workpieces 12a and 12b corresponding to the type are input. , The temperature of the electrode 3, and the determination of the welding current are switched, so that the electrode pressing force for each type of the workpieces 12a and 12b, the pressure reduction or pressure increase during and after welding, and Determining the displacement of the thickness of the workpieces 12a, 12b;
Since there is no need to change the judgment value of the temperature of the electrode 3 and the judgment values of the welding current, it is extremely efficient.

(Embodiment 14) The locking portion 5 provided on the lower slider 2 and the upper slider 1
The lever portion 24 provided with the fulcrum 10 between the abutting end 8 and the urging end 9 as the urging force control means 6 and the lever portion 24 as the urging force control means 6 are symmetrically arranged, so that the urging force can be obtained with a good left-right balance. Can be.

(Embodiment 15) One of two output welding current cables (not shown) from a welding power source is connected to the electrode 3, and the other is connected to the electrode 3 for welding. A current is applied and a thermocompression bonding method using the electrode 3 as a hot electrode, and one of two welding current cables for output from a welding power source is connected to the upper electrode 3, and the other is connected to the electrode. Is equipped with a spot welding type welding method switching part (not shown) connected to another lower electrode (not shown) to allow the welding current to flow, so that one resistance welding device can perform two welding methods. The layout can be reduced, and the capital investment can be reduced.

[0098]

As described above, according to the present invention, the weight of the electrode pressing force supply mechanism itself is not added to the electrode pressing force after the electrode comes into contact with the work to be welded, and the elastic body of the urging means is not used. Since the pressing force of only expansion and contraction can be numerically controlled, a reduced electromagnetic pressing force can be obtained, and the reduced conductor wire or conductor component can be subjected to thermocompression bonding or spot welding.

In addition, the electrode pressure of the workpiece is increased by the forging pressure by detecting the displacement sensor or the temperature sensor during welding, so that the quality of the thermocompression bonding or spot welding of the workpiece can be stabilized. Since the thickness of the workpiece is measured and the temperature of the electrode and the welding current are managed, the quality of the welding is evaluated during welding and the welding result. Can be obtained.

Further, it is possible to provide a resistance welding apparatus capable of performing two welding methods of thermocompression bonding or spot welding in which a single apparatus applies an extremely small electrode pressing force.

[Brief description of the drawings]

FIG. 1 is a perspective view of a resistance welding apparatus according to first, third to fifteenth embodiments of the present invention.

FIG. 2 is a schematic diagram of an urging force control unit of the resistance welding apparatus according to the second embodiment of the present invention.

FIG. 3 is a welding operation diagram of the resistance welding apparatus according to the first to fifteenth embodiments of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 upper slider 2 lower slider 3 electrode 4 biasing means 5 locking part 6 biasing force control means 7 pull-out prevention part 8 contact end 9 biasing end 10 fulcrum 11 weight 12a welded object 12b welded object 13 drive means 14 screw DESCRIPTION OF SYMBOLS 15 Threaded part 16 Displacement sensor 17 Displacement amount measuring part 18 Control part 19 Operating part 20 Temperature sensor 21 Temperature measuring part 22 Cooling means 23 Welding power supply 24 Lever part 25 Roller 26 Wire 27 Workpiece detecting means, Displacement measuring means 28 Welding current measurement section L1 Electrode falling section L2 Electrode pressurizing and upsetting section L3 Forging section L4 Electrode rising section P0 Origin P1 Low speed switching point P2 Workpiece contact point P3 Depressurization start point or pressure increase start point of electrode pressure P4 Decompression point P4 'Pressure increase point H1 Welding result of workpiece by electrode pressure reduction H2 Melting of workpiece by electrode pressure increase Result

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B23K 11/25 510 B23K 11/25 510 513 513 (72) Inventor Yoshiyuki Shimatani 1006 Odakadoma, Kazuma, Kadoma, Osaka F-term (reference) in Matsushita Electric Industrial Co., Ltd. 4E065 AA08 BA06 BB06 CB03

Claims (27)

[Claims] 1. An upper slider driven in the direction of a workpiece, a lower slider slidably held with respect to the upper slider, and an electrode attached to the lower slider and brought into contact with the workpiece. A biasing means for biasing the lower slider provided between the upper slider and the lower slider toward the workpiece, and a locking portion provided on the lower slider,
A resistance welding apparatus comprising: a biasing force control unit that abuts on a locking portion before an electrode abuts on a workpiece to be moved when the lower slider is moved, and biases the lower slider in a direction opposite to the workpiece. 2. The resistance welding apparatus according to claim 1, wherein an elastic body is disposed between the upper slider and the lower slider as the urging means. 3. The resistance welding apparatus according to claim 1, wherein the lower slider is provided with a portion for preventing the lower slider from coming off from the upper slider. 4. An urging force control means includes: a contact end for contacting the locking portion; a biasing end for biasing in the direction of the workpiece; and a fulcrum between the contacting end and the biasing end. Claim 1 consisting of a lever
4. The resistance welding apparatus according to any one of claims 1 to 3. 5. An urging force control means, comprising: an abutting end that abuts against the locking portion; an urging end that urges the workpiece in an opposite direction; and an outer side than the urging end when viewed from the abutting end. The resistance welding apparatus according to any one of claims 1 to 3, comprising a lever portion provided with a fulcrum. 6. The resistance welding apparatus according to claim 1, further comprising driving means for controlling the urging force of the urging means in the direction of the workpiece. 7. The resistance welding apparatus according to claim 6, wherein the driving means includes a motor, a screw rotated by the motor, and a screw portion screwed to the screw and held by an upper slider. 8. The resistance welding apparatus according to claim 6, wherein the driving means includes an electromagnetic valve, a cylinder controlled by the electromagnetic valve, and a joint joined to the cylinder and held by an upper slider. 9. The resistance welding apparatus according to claim 1, further comprising a workpiece detection means for detecting that the tip of the electrode attached to the lower slider has contacted the workpiece. And a displacement sensor held by an upper slider for detecting a gap between the slip-off preventing portion and the upper slider interlocking with the elevation of the electrode, and a workpiece detection signal from the nuclear displacement sensor. The resistance welding apparatus according to any one of claims 1 to 9, comprising a displacement amount measuring unit that calculates the displacement amount. 11. The resistance welding apparatus according to claim 1, further comprising a displacement measuring means for measuring a displacement of a thickness of the workpiece when the workpiece is welded. 12. A displacement sensor which is held by an upper slider for detecting a gap between an upper part slider and a slip-off preventing part interlocked with elevation of an electrode as a displacement amount measuring means, and a displacement for calculating a signal of a nuclear displacement sensor into a displacement amount. The resistance welding apparatus according to claim 11, comprising a quantity measuring unit. 13. A single displacement sensor for the object-to-be-welded detection means and the displacement-amount measuring means is used, and a displacement signal from the displacement sensor at the time of contact with the object to be welded and a workpiece at the time of welding. 13. The resistance welding apparatus according to claim 12, further comprising a displacement amount measurement unit that separates and outputs a displacement amount signal from the displacement sensor. 14. The resistance welding apparatus according to claim 13, wherein the displacement sensor is a differential transformer type displacement sensor. 15. The resistance welding apparatus according to claim 13, wherein the displacement sensor is an optical displacement sensor. 16. An apparatus according to claim 1, further comprising an operation section for inputting an urging force to the workpiece as an electrode pressing force, and a control section for calculating the electrode pressing force as a moving amount of the driving means. Resistance welding equipment. 17. A control unit and an operation unit for driving the driving means in a minus direction when the pressure of the electrode is reduced during welding and then increasing the pressure in the positive direction when increasing the pressure. 17. The resistance welding apparatus according to claim 1, wherein the resistance welding apparatus is provided. 18. The resistance welding apparatus according to claim 1, further comprising a temperature sensor for detecting a temperature of the electrode and a temperature measurement unit. 19. The resistance welding apparatus according to claim 1, further comprising cooling means for cooling the electrodes. 20. The resistance welding apparatus according to claim 19, wherein a cooling pipe for blowing compressed air from at least one direction to the electrode is provided as the cooling means. 21. The resistance welding apparatus according to claim 1, wherein a displacement amount of the thickness of the workpiece to be welded during and after the welding is measured by a displacement amount measuring unit to judge the quality of the welding result. . 22. The resistance welding apparatus according to claim 1, wherein the temperature of the electrode during welding is measured by a temperature measurement unit, and the quality of the welding result is determined. 23. The resistance welding apparatus according to claim 1, wherein a welding current during welding is measured by a welding current measuring unit, and the quality of the welding result is determined. 24. The temperature of an electrode is measured by a temperature measuring unit,
24. The resistance welding apparatus according to claim 1, wherein an output signal at a certain temperature or lower is used as a starting condition of the apparatus. 25. A type of an object to be welded is input to an operation unit, and an electrode pressing force, a pressure reduction or an increase in electrode pressurization during and after welding, and a thickness of an object to be welded corresponding to the type. The resistance welding apparatus according to any one of claims 1 to 24, wherein the determination of the amount of displacement, the determination of the electrode temperature, and the determination of the welding current are switched. 26. A locking portion provided on the lower slider, a portion for preventing the lower slider from coming off from the upper slider, and a lever portion provided with a fulcrum between the abutting end and the urging end as urging force control means. The resistance welding apparatus according to any one of claims 1 to 25, wherein the resistance welding apparatus is symmetrically arranged. 27. One of two welding current cables for output from a welding power source is connected to an electrode, and the other is connected to the electrode to supply a welding current and use a nuclear electrode as a hot electrode. A thermocompression bonding method, a spot in which one of two welding current cables for output from a welding power source is connected to an upper electrode, and the other is connected to a lower electrode different from the above-mentioned electrode to flow a welding current. 2. A welding method switching part of a welding method is provided.
27. The resistance welding apparatus according to any one of claims 26 to 26.