JP3315953B2 - Electric pressurized resistance spot welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-sided electric pressurized resistance spot welding apparatus for performing spot welding while pressing a work between a movable electrode and a stationary electrode board.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the assembly error of a work by dividing a large structure, a welding gun apparatus having an upper movable electrode on a base on which a lower stationary electrode board is provided is used. The movable electrode of the welding gun device provided movably in the axial direction and the Y-axis direction by NC control and stopped at the spot point is linearly moved toward the lower stationary electrode board side using an air cylinder, A one-side type spot welding apparatus that performs spot welding while pressurizing a work between a movable electrode and a stationary electrode board has been prototyped.

[0003]

However, in such an apparatus, the movement of the welding gun device in the X-axis direction and the Y-axis direction is controlled by NC, but the linear movement of the movable electrode of the welding gun device is performed by an air cylinder. Is a pressurized air system using
The air pressure is controlled by the sequence control, but the response is poor due to the complicated path and the electro-pneumatic proportional valve. Was difficult.

By the way, the rotation of the drive motor is converted into a linear motion of a lead screw, and a movable arm having an electrode attached to the tip is linearly moved. A gap between this electrode and the electrode attached to the tip of the fixed arm is obtained. There is known an electric pressurized resistance spot welding apparatus for performing spot welding while pressurizing a work (see, for example, JP-A-5-285665 and JP-A-6-23562).

[0005] In such an apparatus, the electrodes on the movable arm side and the electrodes on the fixed arm side are both point-shaped electrodes, and they are usually configured to move together to the welding portion of the work. In the case of spot welding at a plurality of spots, the electrodes must be moved together so as to sandwich the welding point of the work every time the welding point is changed, and the movement control of the electrodes is complicated and troublesome. It is. In addition, such a device is generally provided, for example, at the tip of an arm of a six-axis articulated robot, and generally takes an arbitrary posture to spot-weld each part of a work. It cannot be applied directly to welding equipment.

The present invention provides an electric pressurized resistance spot welding apparatus which enables coordinated control of the movement control of the welding gun device in the X-axis direction and the Y-axis direction and the control of the linear movement of the movable electrode of the welding gun device. The purpose is to do.

[0007]

An electric pressurized resistance spot welding apparatus according to the present invention includes a welding gun device having a movable electrode, and a workpiece mounted on a base corresponding to the movable electrode. An electric pressurized type comprising a stationary electrode plate, and moving the movable electrode of the welding gun device linearly toward the stationary electrode plate, and performing spot welding while pressing the work between the movable electrode and the stationary electrode plate. Motion converting means provided on the welding gun device for converting the rotary motion of the first drive motor into a linear motion to linearly move the movable electrode; and A gate structure provided on the stationary electrode board so as to be able to reciprocate in a certain direction by a second drive motor; and a third drive motor in the gate structure in a direction orthogonal to the certain direction. Reciprocating The welding gun device has a movable unit supported together with its welding power source, and a reciprocating movement of the portal in the fixed direction and a direction orthogonal thereto, which is linked to the first to third drive motors, and Control means for controlling the linear movement of the movable electrode of the welding gun device , wherein the linear movement of the movable member
Is a linear movement der shall of.

In this way, the control of the reciprocating movement of the gate in the fixed direction (X-axis direction) and the direction perpendicular thereto (Y-axis direction) and the linear movement of the movable electrode of the welding gun device are all driven. It becomes possible by controlling the motors, and it becomes possible to control them in a coordinated manner, thereby increasing the construction speed.

The motion converting means includes a screw rod member of a ball screw means rotatably driven by the first drive motor, and the screw rod member rotatably screwed to support the movable electrode. A movable nut member of a ball screw means, wherein the movable nut member moves in the axial direction of the screw rod member by rotation of the screw rod member.

With this configuration, the rotational motion of the drive motor can be easily converted into a linear motion, and the movable electrode of the welding gun device can be linearly moved toward the stationary electrode board by the drive motor. .

[0011] Further, a conductor disposed on the gate structure and a first contact electrode connected to the conductor are provided, and the first contact electrode is moved toward the stationary electrode board, and the conductor is moved. A first contact gun device electrically connected to the stationary electrode panel, and a second contact electrode connected to the movable electrode via a welding power source, with the second contact electrode facing the conductor. And a second contact gun device for moving the movable electrode and the conductor via the welding power source, and the control means further moves the first and second contact electrodes. Controlling the first contact electrode to contact the stationary electrode board and the second contact electrode to contact the conductor;
It is desirable that the welding gun device be energized at the same time that it is detected that a predetermined pressure has been reached.

According to this configuration, since the contact gun device that moves and connects the contact electrode only when power is supplied is used, the movable electrode (welding gun device) is moved in the fixed direction and the direction perpendicular thereto. In addition, the contact electrode does not need to slide on the stationary electrode board or the conductor, and the contact electrode and the like can be prevented from being worn. In addition, since the first contact electrode comes into contact with the stationary electrode plate and the second contact electrode comes into contact with the conductor, and a predetermined pressing force is applied, the current is applied at the same time. The waiting time, which is the time, can be reduced to almost zero, which is advantageous in shortening the construction time.

In this case, the first and second contact gun devices are further provided to convert the rotational motion of the fourth and fifth drive motors into a linear motion to thereby convert the first and second contact guns. 2nd and 3rd to move the electrode linearly
May be provided.

With this arrangement, the movement of the first and second contact electrodes can be controlled by controlling the drive motor, similarly to the movable electrode of the welding gun device. In addition to the movement control in the axial direction and the Y-axis direction and the linear movement control of the movable electrode, the linear movement control of the first and second contact electrodes can be coordinately controlled by the control means. Also, since the movable electrode and the first and second contact electrodes are linearly moved by the drive motor, it is possible to easily detect that a predetermined pressure has been reached by monitoring the amount of current to the drive motor. ,
Immediate energization is possible, which is advantageous in minimizing the waiting time.

[0015] Further, a cooling device provided in the gate structure for cooling the movable electrode of the welding gun device and the contact electrodes of the first and second contact gun devices with cooling water, and the cooling device and the welding device. The piping of the cooling water between the movable electrode of the gun device and the contact electrodes of the first and second contact gun devices may form a closed circuit in the gate.

This eliminates the need for cooling water piping for cooling the electrodes and the like from the outside, and the cables conventionally required to introduce air piping, cooling water piping, power supply cables and the like from the outside. There is no need to pass through a bear, etc.
Piping work is reduced, which is advantageous for maintenance. Also, since the cooling water pipe is a closed circuit in the gate,
Also in this regard, maintenance work can be reduced.

[0017] Further, there is provided a tilting device having a lifting / lowering member and supporting the end of the work so as to be able to move up and down by the lifting / lowering member,
It is preferable that the tilting device has a structure disposed near the stationary electrode panel.

In this way, in the case of a work having a curved surface or an inclined surface, the end of the work is lifted by the elevating member so that the welding portion can be horizontal and spot-welded. By using the drive motor and the ball screw means as the lifting mechanism of the lifting member in the same manner as described above, it is possible to perform cooperative control by the common control means as in the case of other control axes.

Further, in order to further enhance the working efficiency, a plurality of the stationary electrode panels are arranged in the fixed direction, and further, a part of the stationary electrode panel for performing the welding operation is selected. May be provided.

In this manner, the work can be set and carried out for a stationary electrode panel different from the stationary electrode panel performing the welding operation, and the work efficiency can be improved. Further, by selecting with the selector switch, it is possible to selectively use the stationary electrode panel for performing the welding work, and the tilting device or the like does not operate for the unnecessary stationary electrode panel.

Further, the control means includes first means for reading an NC program, second means for receiving a signal from the first means and selecting an operation program corresponding to the NC program, A third means for receiving the signal from the second means, executing the operation program, and displaying the NC program on a display may be provided.

With this arrangement, the operation program corresponding to the NC program (G code) is selected by the second means, the operation program is executed by the third means, and the NC program is displayed on the display. Since the display is performed, high-speed and high-precision control can be performed by the control unit while maintaining the operability of the conventionally used NC control device.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of a welding gun device used in an electric pressurized resistance spot welding device according to the present invention.

As shown in FIG. 1, the welding gun device 1 has an upper movable electrode 5, which is supported by a movable nut member 7 of a ball screw means 6. One end of the threaded rod member 8 of the ball screw means 6 is rotatably screwed to the movable nut member 7, and the movable nut member 7 is linearly moved in the axial direction of the threaded rod member 8 by the rotation of the threaded rod member 8. It is supposed to. A motor shaft 9a of a first drive motor 9 (servo motor) is connected to the other end of the screw rod member 8 via a coupling 10 so as to rotate the screw rod member 8. . Therefore, the ball screw means 6 is provided in the welding gun device 1 and converts the rotational motion of the drive motor 9 into a linear motion, thereby connecting the upper movable electrode 5 to the lower stationary electrode board 4 (see FIG. 3). This constitutes a motion converting means for linearly moving toward.

The drive motor 9 includes the drive motor 9
And a control unit 15 (control means) for controlling the amount of current to the control unit.
Control of pressurization mode of upper movable electrode 5 by a signal from an encoder (not shown) (position control, speed control, torque control)
To perform spot welding while pressing the works 2 and 3 between the upper movable electrode 5 and the lower stationary electrode board 4.

In this case, since the upper movable electrode 5 is lowered by using the ball screw means 6, the mechanical part (the threaded part of the movable nut member 7 and the screw rod member 8) slides slightly. There is a dynamic resistance, and the pressing force Fs at the time of stabilization fluctuates due to the electrode descent speed (motor speed) at the time of pressing the electrode, and the target pressing force Fc may not be obtained. As shown in FIG. 2, the pressing force is controlled so that the pressing force at a fixed time is not affected by the electrode descending speed.

That is, in the initial stage of pressurization, a pressurizing sequence in which a pressurizing force higher than the target pressurizing force Fc by a predetermined amount ΔF is applied for a short time, and thereafter, the pressurizing force is returned to the predetermined pressurizing force Fc. The static pressure Fs independent of the pressurizing speed can be obtained, and at the same time, the target pressure F
A static pressure Fs equal to c can be obtained. Here, the control of the pressing force is performed by controlling the amount of current to the drive motor 9, and the motor current is rapidly increased in order to obtain a pressing force that is higher than the target pressing force Fc by a fixed amount ΔF. I have to. Here, it is desirable that the predetermined amount ΔF, which is higher than the target pressing force Fc, be set to a value larger than the sliding resistance. For example, in a 1200 kgf pressurizing gun,
It is good to be about 40kgf. The short time may be about one cycle of the control cycle of the control unit 11, for example, about 30 ms.

Next, a description will be given of a one-side spot type electric pressurized resistance spot welding apparatus using the above welding gun apparatus. 3 and 4 are a front view and a side view showing a schematic configuration of the electric pressurized resistance spot welding apparatus.

3 and 4, running rails 12, 12 are disposed on the base 11 on the left and right along the longitudinal direction of the base 11 (hereinafter referred to as the X-axis direction). A gate structure 13 having a U-shaped cross section along 12, 12
It is provided so as to be able to reciprocate by a second drive motor 53 (see FIG. 6).

A lower stationary electrode plate 4 made of a copper surface plate (chromium copper) is provided in a predetermined range on the base 11, and a work to be joined to the upper side of the lower stationary electrode plate 4 by spot welding. 2 and 3 (for example, a flat plate and an aggregate (reinforcing material)) are placed. The lower stationary electrode board 4 has the same size as or larger than the works 2 and 3.

The gate structure 13 has a traveling rail 12 at a lower end thereof.
The lower stationary electrode panel 4 comprises vertical wall portions 13a, 13a having sliders 14 slidably engaged with the upper and lower surfaces, and a horizontal upper wall portion 13b connecting upper ends of the vertical wall portions 13a, 13a. Will move up. And the gate 13
The conductor 21 extends from the lower surface of the horizontal upper wall portion 13b to the inner surface of the vertical wall portion 13a on the side where the welding gun device 1 is provided.
Is provided.

On the horizontal upper wall 13b of the gate structure 13, a movable unit 31 having the welding gun device 1 has a direction orthogonal to the X-axis direction (the longitudinal direction of the base 11) (hereinafter referred to as the Y-axis direction). 3), the third drive motor 54 (see FIG. 6) is provided so as to be able to reciprocate in a suspended state. The movable unit 31 has a welding power source 32 mounted thereon, and the welding gun device 1 has a first contact gun device 33 on the other side such that the upper movable electrode 5 faces downward on one side in the Y-axis direction. The first contact electrodes 34 are respectively provided so as to face upward. A second contact gun device 35 is provided below the vertical wall portion 13a on the side where the welding gun device 1 is provided so that the second contact electrode 36 faces downward.

The first contact electrode 34 of the first contact gun device 33 is connected to the conductor 21 via a second motion converting means similar to that of the upper movable electrode 5 of the welding gun device 1. The fourth drive motor 55 (see FIG. 6) linearly moves the lower stationary electrode panel 4 to electrically connect the conductor 21 to the lower stationary electrode panel 4. On the other hand, the second contact electrode 36 of the second contact gun device 35 is connected to the upper movable electrode 5 via the welding power source 32, and the third contact electrode 36 is the same as that of the upper movable electrode 5 of the welding gun device 1. The conductor 21 is driven by the fifth drive motor 56 (see FIG. 6) through the
And the upper movable electrode 5 is moved linearly toward
Is configured to be electrically connected to the conductor 21 via the.

The upper movable electrode 5 of the welding gun device 1 and the contact gun electrodes 34, 36 of the first and second contact gun devices 33, 35 are linearly moved, and the upper movable electrode 5 of the welding gun device 1 is 2 and 3 and the first and second contact gun devices 3
When the contact electrodes 34 and 36 are brought into contact with the upper surface of the conductor 21, an electric circuit through which a current flows from the welding power source 32 is formed.

In addition, as shown in FIG.
A cooling water circulating device 41 for circulating cooling water for cooling the upper movable electrode 5 of the welding gun device 1 is provided, and the welding gun device 1 and the contact gun device 33 are provided from the circulating device 41 via a cooling water distributor 42. Of cooling water to supply cooling water to the contact electrodes 34, 36 of the
3, 44, and 45 are performed. This cooling water pipe 43
Numerals 45 are pipe routes closed in the gate 13, and supply of cooling water from outside the gate 13 is not required.

The drive motors 9, 55, 5 of the welding gun device 1, the first and second contact gun devices 33, 35
6, and the drive motors 53 and 54 of the gate structure 13 in the X-axis direction and the Y-axis direction are controlled and coordinated by the control unit 15 which is a single control means.

Next, the control system of the apparatus will be described with reference to FIG.
It is explained along.

The servo unit 52 is controlled by the control CPU 51 of the control unit 15 (panel computer).
The operation of the welding gun device 1 and the servo unit 5 are controlled.
2, a first drive motor 9 for raising and lowering the upper movable electrode 5 of the welding gun device 1, a second drive motor 53 for moving the portal 13 in the X-axis direction, and a third drive motor for moving in the Y-axis direction 54, the fourth and fifth motors 55 and 56 for raising and lowering the contact electrodes 34 and 36 of the first and second contact gun devices 33 and 35 are driven and controlled, and the welding operation by the welding gun device 1 is controlled. Is also performed.

The control by the control CPU 51 is performed by Windows application software 57. The control CPU 51 receives a signal from the first means 51A for reading the NC program and receives the signal from the first means 51A. Second means 51B for selecting an operation program (robot program) corresponding to the G code
And a third unit 51C that receives the signal from the second unit 51B, executes the operation program, and displays the NC program on a display.

Therefore, the conventional NC is displayed on the monitor screen.
The program created with the G code for NC is displayed, and the above-described various controls are executed while taking the form of executing the program created with the G code for NC. The control CPU 51 operates in a robot language (AS language) and has excellent versatility.

As described above, the operation of selecting and starting the robot program corresponding to the G code of the NC program is continuously processed by the control unit 15, thereby maintaining the operability of the conventionally used NC control device. In this state, the control unit 15 can control the peripheral devices including the welding gun device 1 at the same time as the high-speed and high-precision control.

Table 1 below shows an example of a correspondence table between G codes and robot operation programs, and shows an example of definitions of G codes.

[0044]

[Table 1]

[0045]

[Table 2]

Therefore, according to the above-described apparatus, first, before the spot welding operation, the works 2 and 3 are set on the lower stationary electrode board 4 of the base 11. In this case, the gate 13 may or may not be located above.

Then, based on the command from the control unit 15, the drive motors 53 and 54 are driven,
Gate structure 13 and movable unit 3 suspended therefrom
1 moves the welding gun device 1 in the X-axis direction and in the Y-axis direction.
It moves two-dimensionally in the axial direction, is positioned at a predetermined welding point (spot point), and performs spot welding.

When this welding operation is performed, the movable electrode 5 of the welding gun device 1 and the contact electrodes 34, 36 of the first and second contact gun devices 33, 35 are simultaneously
The motor is linearly moved by increasing the motor current linearly. Here, the contact electrodes 34 and 36 are
In addition, the stroke until the movable electrode 5 contacts the workpiece 3 on the stationary electrode board 4 is shorter than the stroke until the movable electrode 5 contacts the stationary electrode board 4.
After the contact of the movable electrode 6, the movable electrode 5 comes into contact, and the pressure applied thereto is increased to a predetermined pressure (Fc + ΔF).

When the pressure applied by the movable electrode 5 reaches a predetermined pressure (Fc + ΔF) in a state where the contact electrodes 34 and 36 are in contact with each other, the welding gun device 1 is simultaneously energized to perform spot welding. After the elapse of the predetermined time Δt, the motor current is reduced so as to reach the target pressure Fc, and the static pressure Fc is set substantially equal to the target pressure Fc. Further, the fact that the energizing path for spot welding is secured is detected by stopping the increase of the motor current flowing through the drive motors 9, 55, 56 of the welding gun device 1 and the contact gun devices 33, 35.

Therefore, there is almost no waiting time from when the energization path is secured to when power is applied, and the time required to secure the energization path can be reduced. If a pressurized air (air cylinder) is used as the linear moving means of the electrodes of the welding gun device and the first and second contact gun devices, it is not possible to directly detect that a predetermined pressure has been reached. Since the welding gun device and the first and second contact gun devices can cope with the predetermined pressing force by setting a predetermined waiting time, the predetermined pressing force is reached from the start of pressurization. Time tends to be longer.

When moving to the next welding point after welding, the contact electrodes 34, 36 do not slide on the lower panel 4 or the conductor 21, and the contact electrodes 34, 3 do not slide.
6 can be prevented from being worn.

The cooling water pipes 43 to 46 for cooling the electrodes 5, 34 and 36 are closed in the gate 13, and the upper movable electrode 5 and the contact gun 33, Since the drive of the contact electrodes 34 and 36 of 35 is performed not by pressurized air but by electricity, there is no need to supply factory air or cooling water to the gate structure 13.
The operation is enabled only by the supply of electric power through the electric power wiring.
Therefore, cooling water piping and air piping are not required, and maintenance work is greatly reduced. Further, since the cooling water pipe is also closed in the gate 13, the maintenance work can be reduced from this point as well.

In the above embodiment, the present invention is applied to the case where the work has a flat shape, but when the work has a curved surface or an inclined surface with an angle, the welded portion is made horizontal. Since it is necessary, as shown in FIGS. 7 and 8, a tilting device 61 can be provided on one side of the works 2A and 3A along the X-axis direction.

The tilting device 61 raises and lowers the elevating member 62 extending in the X-axis direction in accordance with an instruction from the control unit 15. Both ends of the elevating member 62 are supported as shown in FIG. I have. That is, the movable nut member 6 of the ball screw means 63 is provided at the end of the elevating member 62.
4 is provided, and the nut member 64 is rotatably screwed to a screw rod member 65 of the ball screw means 63 extending in the vertical direction. The upper end of the threaded rod member 65 of the ball screw means 63 is connected to a tilt axis drive motor 66, and the drive of the tilt axis drive motor 66 is controlled by the control unit 15. Therefore, the ascending / descending member 62 ascends while supporting a part of the work 2A so that the welded portion of the work 2A is in a substantially horizontal state and the welded portion of the work 2A is in a state of being overlapped with the work 3A. And the spot welding can be easily performed. Driving of the tilting device 61 (tilting axis drive motor 66) is also performed by the control unit 15, so that the control can be performed with high accuracy and cooperative control with other control axes can be performed.
In addition, in the above-described example, the lift amount of the work 2A by the lifting member 62 (the rotation amount of the drive motor 66) is input to the control unit 15 in advance according to the work type because the work type is known.

Further, in the above-described embodiment, there is only one welding station on which a workpiece is placed. However, as shown in FIG. S1 and S2 (each independently having a lower stationary electrode board 4, 4 (copper platen)) are arranged in parallel, and while one spot is being spot-welded by the welding gun device 1 at one welding station S1. In addition, it is also possible to improve the efficiency of the work by setting and carrying out the work for performing the welding work at another welding station S2. Further, by selecting any one of the welding stations S1 and S2 with a selector switch (not shown), the welding station S1 is selected.
The gate structure 13 and the tilting device 61 according to the offset amounts of S1 and S2.
Operate only at the selected welding station, so that the use of the welding station can be easily performed.

[0056]

The present invention is embodied as described above, and has the following effects.

The electric pressurized resistance spot welding apparatus according to the present invention comprises a reciprocating movement of a gate in a fixed direction and a direction perpendicular thereto, and a linear movement of a movable electrode of the welding gun device ( a movable electrode for obtaining a pressing force). ) Are all performed by the drive motor, so that they can be coordinated and controlled by a single control means, and the construction speed can be increased.

Further, since the motion converting means uses the ball screw means for moving the movable nut member in the axial direction of the screw rod member by rotating the screw rod member, the rotational motion of the drive motor is converted into a linear motion. The conversion can be easily performed, and the movable electrode of the welding gun device can be linearly moved by the drive motor.

Further, since the contact electrode of the contact gun device is brought into contact only at the time of welding, when the movable electrode (weld gun device) is moved in the fixed direction and the direction orthogonal thereto, the contact electrode is made of a conductor or the like. Therefore, it is not necessary to slide on the contact electrode, and wear of the contact electrode and the like can be prevented. In addition, the movable electrode and the first contact electrode press the stationary electrode board, and the second contact electrode presses the conductor. Therefore, the waiting time can be reduced to almost zero, which is advantageous in shortening the construction time.

A cooling device provided in the portal for cooling the movable electrode of the welding gun device and the contact electrodes of the first and second contact gun devices with cooling water;
Since the piping of the cooling water between the cooling device and the movable electrode of the welding gun device and the contact electrode of the first and second contact gun devices has a closed circuit in the gate, external electrodes and the like can be used. There is no need to provide cooling water piping for cooling, and there is no need to pass a conventionally required cable carrier or the like. This reduces piping work and is advantageous in maintenance. In addition, since the cooling water pipe has a closed circuit in the gate, maintenance work can be reduced in this respect as well.

Further, by providing a tilting device for supporting the end of the work so as to be able to move up and down by the elevating member, it is possible to cope with a work having a curved surface or an inclined surface. be able to.

Further, if a plurality of stationary electrode panels are arranged in the above-mentioned fixed direction, work setting and unloading can be performed for a stationary electrode panel different from the stationary electrode panel for welding. Can be performed and work efficiency can be improved.
In addition, by selecting with a selector switch that selects which part of the stationary electrode panel to perform the welding work, it is possible to selectively use the stationary electrode panel for performing the welding work, and it is possible to operate an unnecessary stationary electrode panel. Absent.

Further, the control means controls the N
An operation program corresponding to the C program (G code) is selected, and the operation program is executed by the third means and the NC program is displayed on a display.
High-speed and high-precision control can be performed by the control means while maintaining the operability of the control device.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a welding gun device according to the present invention.

FIG. 2 is a diagram showing a relationship between a pressurizing time and a pressing force in the welding gun device according to the present invention.

FIG. 3 is a front view showing a schematic configuration of a one-side spot type electric pressurized resistance spot welding apparatus according to the present invention.

FIG. 4 is a side view of the same.

FIG. 5 is an explanatory diagram showing a cooling system of the device according to the present invention.

FIG. 6 is a block diagram of a control system of the device according to the present invention.

FIG. 7 is a diagram similar to FIG. 3 for another embodiment.

FIG. 8 is an explanatory view of a tilting device according to the present invention.

FIG. 9 is a plan view of still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding gun apparatus 2 Work 3 Work 4 Lower stationary electrode board 5 Upper movable electrode 6 Ball screw means 7 Movable nut member 8 Screw bar member 9 First drive motor 11 Base 13 Gate structure 15 Control unit 21 Conductor 31 Movable unit 32 welding power supply 33 first contact gun device 34 first contact electrode 35 second contact gun device 36 second contact electrode 41 cooling water circulation device 43 cooling water piping 44 cooling water piping 45 cooling water piping 51 control CPU 51A First means 51B Second means 51C Third means 53 Second drive motor 54 Third drive motor 55 Fourth drive motor 56 Fifth drive motor 61 Tilt device 62 Elevating member 63 Ball screw Means S1 Welding station S2 Welding station

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroshi Nakazawa 2-1-1-18 Wadayama-dori, Hyogo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Hyogo Plant (72) Inventor Shoji Takeichi Chuo-ku, Kobe-shi, Hyogo 3-1-1, Higashi-Kawasaki-cho, Kobe Plant, Kawasaki Heavy Industries, Ltd. (72) Inventor Takao Yamaguchi 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. Inside Akashi Plant (72) Inventor, Takayuki Hattori Kobe, Hyogo Prefecture 2-1-1-18 Wadayama-dori, Hyogo-ku, Kawasaki Heavy Industries, Ltd. Hyogo Plant (56) References JP-A-62-158579 (JP, A) Real Opening Sho-62-151079 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B23K 11/11 B23K 11/24 B23K 11/36

Claims (8)

(57) [Claims] 1. A welding gun device having a movable electrode, and a stationary electrode board provided on a base corresponding to the movable electrode and on which a workpiece is placed, wherein the movable electrode of the welding gun device is In an electric pressurized resistance spot welding apparatus for performing linear welding toward a stationary electrode panel and performing spot welding while pressing a work between the movable electrode and the stationary electrode panel, provided in the welding gun device, A motion converting means for linearly moving the movable electrode by converting the rotational motion of the drive motor into a linear motion; and a reciprocating movement of the second drive motor on the stationary electrode board in a fixed direction on the base. And a third drive motor is provided on the gate so as to be reciprocally movable in a direction orthogonal to the predetermined direction, and the welding gun device is supported together with its welding power source. Movable unit And control means linked to the first to third drive motors for controlling reciprocal movement of the gate structure in the fixed direction and a direction orthogonal thereto, and linear movement of the movable electrode of the welding gun device. provided, the linear movement of the movable electrode, linear phase to obtain a pressure
Dodea Rukoto electric pressurized resistance spot welding apparatus according to claim. 2. The method according to claim 1, wherein the motion converting means includes a screw rod member of a ball screw means rotated and driven by the first drive motor, and the screw rod member rotatably screwed to support the movable electrode. The electric pressurized resistance spot welding apparatus according to claim 1, further comprising a movable nut member of a ball screw means, wherein the movable nut member moves in the axial direction of the screw rod member by rotation of the screw rod member. 3. The semiconductor device according to claim 1, further comprising a conductor disposed on the gate structure, and a first contact electrode connected to the conductor.
Moving the contact electrode toward the stationary electrode board,
A first contact gun device for electrically connecting the conductor to the stationary electrode board; and a second contact electrode connected to the movable electrode via a welding power source. And a second contact gun device for electrically connecting the movable electrode to the conductor via the welding power source, the control means further comprising: the first and second contact electrodes At the same time that the first contact electrode contacts the stationary electrode board and the second contact electrode contacts the conductor, and it is detected that a predetermined pressure has been reached. 3. The electric pressurized resistance spot welding apparatus according to claim 1, wherein current is supplied to the resistance spot welding apparatus. Further, the first and second contact gun devices are provided in the first and second contact gun devices, and convert the rotational motions of the fourth and fifth drive motors into linear motions to convert the first and second contact electrodes. 4. The electric pressurized resistance spot welding apparatus according to claim 3, further comprising second and third motion converting means for performing linear movement. 5. A cooling device provided on the portal for cooling a movable electrode of the welding gun device and a contact electrode of the first and second contact gun devices with cooling water; and the cooling device and the welding. 4. The electric pressurized resistance spot welding apparatus according to claim 3, wherein the piping of the cooling water between the movable electrode of the gun device and the contact electrodes of the first and second contact gun devices has a closed circuit in the gate. . 6. The apparatus according to claim 1, further comprising a tilting device having an elevating member and supporting the end of the work so as to be able to move up and down by the elevating member, wherein the tilting device is disposed near the stationary electrode panel. The electric pressurized resistance spot welding apparatus according to any one of claims 1 to 5. 7. The stationary electrode panel, wherein a plurality of the stationary electrode panels are disposed in the predetermined direction, and further comprising a selector switch for selecting a portion of the stationary electrode panel to perform a welding operation. The electric pressurized resistance spot welding apparatus as described in the above. 8. The control means includes: first means for reading an NC program; second means for receiving a signal from the first means and selecting an operation program corresponding to the NC program; A third means for receiving the signal from the second means, executing the operation program, and displaying the NC program on a display.
8. The electric pressurized resistance spot welding apparatus according to any one of claims 1 to 7.