JPH0767620B2 - Vacuum seam 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 vacuum seam welding apparatus for seam welding an object to be welded such as a thin metal plate in a vacuum. A seam having a pair of fixed-side electrode shaft and movable-side electrode shaft, and having movable-side electrode shaft moving means for moving the movable-side electrode shaft away from and approaching the fixed-side electrode shaft so as to sandwich an object to be welded. By disposing the welding machine main body outside the vacuum chamber with the pair of electrode shafts protruding into the vacuum chamber, and by providing a device for vacuum-sealing the penetrating portion of the pair of electrode shafts into the vacuum chamber. The present invention relates to a vacuum seam welding device for seam welding an object to be welded arranged in a vacuum chamber.

[0002]

BACKGROUND OF THE INVENTION Conventionally, seam welding of an object to be welded such as a thin metal plate is generally performed in the atmosphere. FIG. 7 is a side view showing a configuration example of a seam welder for seam welding an object to be welded in the atmosphere, and FIG. 8 is a front view of the seam welder shown in FIG.

In FIGS. 7 and 8, 111 is at the tip.
Lower electrode shaft with disk rotating electrode 113 attached , 112
Is an upper electrode shaft that is disposed above and parallel to the lower electrode shaft 111 and has a disc rotating electrode 114 attached to the tip thereof . The lower electrode shaft 111 is the base plate 11
It is rotatably supported by the lower electrode head 116 fixed to 5. The upper electrode shaft 112 is rotatably supported by the upper electrode head 117, and is also fixed to the upper electrode head 117 with a gear head.
It is adapted to be rotated by the drive gear 119 by 118. The upper electrode head 117 is rotatably supported by the lower electrode head 116 by a shaft 120.

Stays 116a and 117a are fixed to the electrode heads 116 and 117, respectively.
The stay 116a fixed to the 116 is attached to the upper electrode head 117.
A fixing bolt 121 is screwed through the stay 117a fixed to the fixing bolt 121, and a coil spring 122 for pushing the upper electrode head 117 downward is fitted on the fixing bolt 121. In addition, the stay 11 of the lower electrode head 116 is
The air cylinder 12 is attached to the 6a while its lower end is supported.
3 are provided. As shown in the figure, these stays 116a and 117a, the fixing bolt 121, the coil spring 122, and the air cylinder 123 are provided symmetrically, and the fixing bolt 121 also covers the inside of the air cylinder 123. It is designed to penetrate.

Therefore, the upper electrode head 11 is designed to be pushed downward by the coil spring 122.
7 is pushed upward through the stay 117a by advancing a cylindrical rod (not shown) incorporated in the air cylinder 123 when the object to be welded is sandwiched between the disc rotary electrodes 113 and 114. It is like this. As a result, the upper electrode shaft 112 can move closer to and away from the lower electrode shaft 111 in the vertical direction.

On the other hand, a welding transformer 125 is arranged in the transformer case 124, and the above-mentioned electrode shafts 111, 112 are provided.
As shown in the figure, the terminals 125a, of the welding transformer 125 are connected via the feeding metal (not shown) and the secondary conductors 126a, 126b.
Each connected to 125b. A part of the secondary conductor 126a for the upper electrode shaft is a flexible conductor formed of a laminated copper plate or the like.

Using the seam welding machine constructed as described above, a thin metal plate is sandwiched between the pair of disc rotating electrodes 113 and 114, and is pressed and energized to perform seam welding in the atmosphere. .

By the way, in recent years, it is increasingly required to improve the quality of seam welded parts such as thin metal plates. In order to respond to this, it is conceivable to perform seam welding in a vacuum. When seam welding thin metal plates in a vacuum, placing the entire seam welder in the vacuum chamber
It is not a good idea because the vacuum chamber becomes large.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and a disk rotating electrode is provided at the tip.
Inside the vacuum chamber with a pair of attached electrode shafts
The seam welder body with the vacuum chamber
Of the two electrode shafts inside the vacuum chamber.
By vacuum sealing the penetrating part, it is possible to perform vacuum seam welding on the workpiece in the vacuum chamber, which can improve the quality of the seam welded part, and the vacuum chamber can be downsized and shortened. It is an object of the present invention to provide a vacuum seam welding apparatus capable of obtaining a predetermined degree of vacuum in time and efficiently seam-welding an object to be welded in a vacuum.

[0010]

In order to achieve the above object, a vacuum seam welding apparatus according to the present invention comprises a vacuum chamber in which an object to be welded is placed and a vacuum is drawn, and a disk rotating electrode at the tip. With a fixed side electrode shaft and a movable side electrode shaft arranged in parallel to the fixed side electrode shaft and having a disk rotating electrode attached to the tip end thereof, and with respect to the fixed side electrode shaft, A movable electrode shaft moving means for moving the movable electrode shaft away from and approaching the movable electrode shaft is provided, and the movable electrode shaft is arranged outside the vacuum chamber with both electrode shafts protruding into the vacuum chamber. The seal includes a seam welder main body that is sandwiched by a disc rotating electrode and pressurizes and energizes to perform seam welding, and a seal device that vacuum-seals a portion where the two electrode shafts penetrate into the vacuum chamber.
Through the device, the movable electrode shaft is rotatably penetrated.
The inner peripheral surface of the hole allows close contact with the outer peripheral surface of the movable electrode shaft.
Side ring with side ring
And a movable seal plate fitted to the movable side electrode shaft.
And a through hole through which the fixed-side electrode shaft is rotatably penetrated
A seal that can be attached to the inner peripheral surface of the fixed electrode shaft.
It has a ring and is fitted with the movable seal plate.
The movable side electrode shaft is separated from the fixed side electrode shaft.
For the side face of the movable seal plate, which is housed so as to be movable
The seal ring is formed with a sealing surface that allows close contact
Which has a movable side electrode shaft moving space
At the position of the opening for projecting both electrode shafts in
It is specially configured with the fixed seal plate attached.
It is a characteristic.

[0011]

In the vacuum seam welding apparatus according to the present invention
Is the one with the disc rotating electrodes attached to the tips.
A vacuum chamber with a pair of fixed-side electrode shaft and movable-side electrode shaft
With the seam welder body protruding into the vacuum chamber,
Is placed outside the chamber and is placed inside the vacuum chamber.
A sealing device for vacuum-sealing the penetrating part of the electrode shaft
It is equipped. The sealing device is used in the vacuum chamber.
Attached to the position of the opening for protruding both electrode shafts
The fixed seal plate and the movable side electrode shaft are fitted.
A movable seal that is movably accommodated in the fixed seal plate by
And a plate.

When the inside of the vacuum chamber is evacuated,
Provided on the inner peripheral surface of the fixed side electrode shaft through hole of the fixed seal plate.
With the obtained seal ring, the fixed side electrode shaft and the fixed seal
A vacuum seal is made between the boards. In addition, the movable seal plate
Seal ring provided on the inner peripheral surface of the through hole for the movable electrode shaft
Vacuum seal between the movable electrode shaft and the movable seal plate
Side surface provided on the side surface of the movable seal plate
Between the fixed seal plate and the movable seal plate
It is vacuum sealed with.

The object to be welded is sandwiched between the disc rotating electrodes.
To move the movable electrode shaft of the seam welder
When the moving means is activated, the fixed seal plate
A seal that allows the side seal ring of the dynamic seal plate to be in close contact.
Of the movable side electrode shaft moving space formed by having a curved surface
Since it is provided, while maintaining the vacuum seal state
, Push the movable side electrode shaft upward with respect to the fixed side electrode shaft.
They can be spaced apart.

[0014]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a side view of a seam welding machine body that constitutes a vacuum seam welding apparatus according to an embodiment of the present invention, and FIG. 2 is a side view for explaining the overall structure of a vacuum seam welding apparatus according to an embodiment of the present invention. 3 is another side view for explaining the overall configuration of the vacuum seam welding apparatus shown in FIG. 2, and FIG. 4 is a plan view for explaining the overall configuration of the vacuum seam welding apparatus shown in FIG.

In FIG. 1, reference numeral 10 denotes a seam welder main body. The seam welder main body 10 has a structure in which the lower electrode shaft and the upper electrode shaft are made long, and both electrode shafts are Except that the axial direction and the longitudinal direction of the transformer case are arranged so as to be orthogonal to each other, the configuration is the same as that shown in FIG. 7 described above. Only do.

That is, in FIG. 1, 11 is a circle at the tip.
A lower electrode shaft having a plate rotating electrode 13 attached thereto, 12 an upper electrode shaft having a disc rotating electrode 14 attached at its tip, 15 a base plate, 16 a lower electrode head, 17 an upper electrode head, 16
Reference numerals a and 17a are stays, 18 is a motor with a gear head that incorporates a drive gear (not shown) for rotating the upper electrode shaft, and 20 is a shaft.

Further, 21 is a fixing bolt, 22 is a coil spring,
23 is an air cylinder, 24 is a transformer case, 25a, 25b
Is a terminal of a welding transformer (not shown) arranged in the transformer case 24, 26a is a flexible secondary conductor for the upper electrode shaft 12, and 26b is a secondary conductor for the lower electrode shaft 11. The fixing bolt 21, the coil spring 22 and the air cylinder 23 are
It constitutes a moving means for the upper electrode shaft 12, which is the movable electrode shaft.

2 to 4, reference numeral 30 denotes a main body case, and the main body case 30
Is formed by integrating the vacuum chamber 31 and the machine housing case 32. An object to be welded (not shown) such as a thin metal plate is held in the vacuum chamber 31, and a pair of guide rails 33
A moving table 34 that is horizontally moved along the is arranged. On the other hand, the machine housing case 32, the both electrode shaft 1
The seam welder body 10 described above is arranged in a state where the first and the second parts 12 project into the vacuum chamber 31, and the exhaust pipe 35a
A vacuum pump 35 for evacuating the inside of the vacuum chamber 31 via the is provided. Reference numeral 50 denotes a sealing device, which will be described later, for vacuum-sealing the penetrating portions of the both electrode shafts 11 and 12 into the vacuum chamber 31.

The vacuum chamber 31 is erected on the bottom plate 36 and serves as a partition for the machine housing case 32. The partition wall 31a also has a front plate 37 shorter than the partition wall 31a and is horizontally fixed above the bottom plate 36. An upper bottom plate 38 to which a pair of guide rails 33 are fixed, an opening / closing door, and front and rear sides are respectively fixed to the partition wall 31a and the front plate 37 so as to be inclined downward downward, and are framed in a rectangular shape. It is formed by a front door 40 and left and right side plates 41a and 41b which are closely attached to the frame plate 39 when closed. Welding status monitoring, welding start and stop
It is a transparent device that allows you to observe the inside to perform operations such as
The front door 40 provided with a clear acrylic window 40a has side plates 41b.
It is adapted to be opened and closed by an opening and closing air cylinder 42 attached to the.

The machine housing case 32 includes a partition wall 31a, a bottom plate 36, a top plate 43, and a back plate 4 of the vacuum chamber 31 which are commonly used.
4 and left and right side plates 45a, 45b are formed in a horizontally long box shape, and a plurality of ventilation holes 46 are provided on the side surface and the back surface. It should be noted that the vacuum gauge, the operation switch for opening and closing the front door 40, the operation panel of the seam welding machine body 10, and the like are omitted in the drawing.

Next, the sealing device will be described. FIG. 5 is a sectional view of a sealing device of the vacuum seam welding device shown in FIG.
FIG. 6 is a plan view of the sealing device shown in FIG. In FIGS. 5 and 6, the sealing device 50 is a pair of disc rotating electrodes 1
The upper electrode shaft 12 can be moved vertically toward and away from the lower electrode shaft 11 in order to sandwich and remove the object to be welded between 3 and 14, and project into the vacuum chamber 31. This is for making it possible to vacuum seal the penetrating portions of the both electrode shafts 11 and 12, and is composed of a movable seal plate 60 and a fixed seal plate 70.

The movable seal plate 60 has the upper electrode shaft 12 inserted therethrough, and has a circular donut shape having an upper electrode shaft circular through hole 61 through which the upper electrode shaft 12 rotatably passes. An O-ring 62 that can be closely attached to the outer peripheral surface of the upper electrode shaft 12 is provided in the annular groove on the inner peripheral surface of the hole, and side surface O-rings 63a and 63b are provided in the annular grooves on both side surfaces.

The fixed seal plate 70 is composed of a housing plate 70a and a pressing plate 70b. Housing plate 70a
Is attached to a circular donut-shaped opening peripheral plate 31b fixed to the opening portion of the partition wall 31a of the vacuum chamber 31 with a bolt (not shown).

As shown in FIGS. 5 and 6, the housing plate 70a includes a lower electrode shaft circular through hole 71 through which the lower electrode shaft 11 rotatably passes, and an upper side inserted through the movable seal plate. An elliptic through hole having a step for accommodating the electrode shaft 12 so as to be movable toward and away from the lower electrode shaft 11 in the vertical direction. The stepped oval through-hole is a small-diameter oval hole 72 extending in the vertical direction with the size of the vacuum chamber 31 side portion larger than the upper electrode shaft 12 diameter and smaller than the movable seal plate 60 diameter, and connected to this. The portion is a large-diameter oval hole portion 73 having a size larger than the diameter of the movable seal plate 60 and extending in the vertical direction.

Further, the housing plate 70a is provided with an O-ring 74 which can be brought into close contact with the outer peripheral surface of the lower electrode shaft 11 in an annular groove on the inner peripheral surface of the lower electrode shaft circular through hole 71. O-ring 75 that can be closely attached to the inner peripheral surface of the apertured peripheral edge plate 31b
Is equipped with.

On the other hand, a holding plate 70 having an oval donut shape
The b has a size larger than the large-diameter oval hole portion 73 of the housing plate 70a and has an oval through hole 76 having the same size as the small-diameter oval hole portion 72 of the housing plate 70a. Therefore, the movable seal plate 60 is set in the large-diameter oval hole portion 73 of the housing plate 70a, and the movable seal plate 60 is slidable in the vertical direction on the side surface of the housing plate 70a on the seam welder body 10 side. By mounting the plate 70b using bolts (not shown), the upper electrode shaft 12 inserted into the movable seal plate 60 is moved by the housing plate 70a and the pressing plate 70b with respect to the lower electrode shaft 11. Upper electrode shaft moving space that can move vertically apart and approach with
77 are formed.

In this embodiment, the housing plate 70a
The pressing plate 70b and the pressing plate 70b are such that the surface on the movable seal plate 60 side is a sealing surface to which the side O-rings 63a, 63b of the movable seal plate 60 are in close contact. In addition, the movable seal plate 60 is an upper electrode shaft.
In order to prevent contact current with 12 in this example, an electrically insulating material such as Teflon (trade name), which is a fluororesin, is used in this embodiment.

The operation of the vacuum seam welding apparatus configured as described above will be described below with reference to FIGS. 1, 2 and 5 and 6. When the air cylinder 23 is operated to sandwich an object to be welded (not shown) between the pair of disc rotating electrodes 13 and 14 of the seam welder body 10, the housing plate 70a
Since the upper electrode shaft moving space 77 is formed in the fixed seal plate 70 constituted by the pressure plate 70b and the pressing plate 70b, the upper electrode shaft 12 inserted into the movable seal plate 60 is moved together with the sliding movable seal plate 60. It is moved a predetermined distance in the upward direction. When the air cylinder 23 is turned off, the upper electrode shaft 12 inserted into the movable seal plate 60 is pushed down by the biasing force of the coil spring 22 and moves downward. As a result, the object to be welded arranged in the vacuum chamber 31 can be sandwiched between the disc rotary electrodes 13 and 14.

When the front door 40 is closed and the inside of the vacuum chamber 31 is evacuated, the O-ring 74 provided in the annular groove on the inner peripheral surface of the circular through hole 71 for the lower electrode shaft of the housing plate 70a moves downward. A vacuum seal is made between the side electrode shaft 11 and the housing plate 70a. In addition, a circular through hole for the upper electrode shaft of the movable seal plate 60
An O-ring 62 provided in the inner peripheral annular groove of 61 provides a vacuum seal between the upper electrode shaft 12 and the movable seal plate 60, and a side surface O groove provided in the side annular groove of the movable seal plate 60.
Housing plate 70a and pressing plate by rings 63a and 63b
Fixed seal plate 70 composed of 70b and movable seal plate
Vacuum sealed between 60. Furthermore, since the housing plate 70a is provided with an O-ring 75 that can be brought into close contact with the inner peripheral surface of the apertured peripheral plate 31b of the vacuum chamber 31, the lower and upper electrode shafts 11 and 12 penetrate into the vacuum chamber 31. The parts can be vacuum sealed. It should be noted that this is of course the same at the time of welding.

In this way, the disc rotating electrode is
A pair of fixed-side electrode shafts and a movable-side
Seam welding with the polar axis protruding into the vacuum chamber
Place the machine body outside the vacuum chamber and
Vacuum seal the penetration of both electrode shafts into the bar.
Since it is a
Can be empty seam welded, which allows seam welds
It is possible to meet the demand for higher quality and seam welding.
Since the entire machine does not have to be placed in the vacuum chamber, the vacuum
The chamber is downsized so that a certain degree of vacuum can be obtained in a short time .
It is possible to efficiently seam-weld an object to be welded in a vacuum.

In the above embodiment, the movable seal plate
The side O-ring 60 may not be provided on each side of the movable seal plate 60, but may be provided on any one of the sides. Further, one O-ring is provided on the inner peripheral surface of the upper electrode shaft circular through hole 61 of the movable seal plate 60 and the inner peripheral surface of the lower electrode shaft circular through hole 71 of the housing plate 70a in the above embodiment. An example of arranging the O-rings is shown,
Oils (grease) are placed between the two O-rings arranged side by side.
A reservoir may be provided. As a result, vacuum sealing can be performed more reliably and the life of the O-ring can be extended.

[0032]

As described above, according to the present invention, the true
According to the empty seam welding device, the disc rotating electrode is
A pair of fixed side electrode shaft and movable side, each attached
Seam melting with the electrode shaft protruding into the vacuum chamber
Place the main body of the contactor outside the vacuum chamber, and
Vacuum seal the penetrating parts of both electrode shafts into the chamber.
Since it is the one that was welded,
Can be vacuum seam welded, which allows seam welding
It is possible to meet the high quality of the
This is true because it is not necessary to place the entire contactor in the vacuum chamber.
The empty chamber is downsized so that the required vacuum level can be obtained in a short time.
Thus , the object to be welded can be efficiently seam-welded in a vacuum.

[Brief description of drawings]

FIG. 1 is a side view of a seam welding machine body that constitutes a vacuum seam welding apparatus according to an embodiment of the present invention.

FIG. 2 is a side view for explaining the overall configuration of the vacuum seam welding apparatus according to the embodiment of the present invention.

FIG. 3 is another side view for explaining the overall configuration of the vacuum seam welding apparatus shown in FIG.

FIG. 4 is a plan view for explaining the overall configuration of the vacuum seam welding apparatus shown in FIG.

5 is a cross-sectional view of a sealing device of the vacuum seam welding device shown in FIG.

FIG. 6 is a plan view of the sealing device shown in FIG.

FIG. 7 is a side view showing a configuration example of a seam welding machine for seam welding an object to be welded in the atmosphere.

8 is a front view of the seam welder shown in FIG. 7 as viewed in the direction of arrow A. FIG.

[Explanation of symbols]

10 ... Seam welder body 11 ... Lower electrode shaft 12 ... Upper electrode shaft 13, 14 ... Disc rotating electrode 16 ... Lower electrode head 17 ...
Upper electrode head 16a, 17a ... Stay 18 ... Motor with gear head 20 ... Shaft 21 ... Fixing bolt 22 ... Coil spring 23 ... Air cylinder 24 ... Transformer case 30 ... Main body case 31 ... Vacuum chamber 31a ... Partition wall 31b ...
Peripheral plate 32 ... Machine housing 33 ... Guide rail
34 ... Moving table 35 ... Vacuum pump 35a ... Exhaust pipe 36
… Bottom plate 37… Front plate 38… Top bottom plate 39… Frame plate 40… Front door
40a ... Acrylic windows 41a, 41b ... Side plate 42 ... Opening / closing air cylinder 43 ... Top plate 44 ... Back plate 45a, 45b ... Side plate
46 ... Ventilation hole 50 ... Sealing device 60 ... Movable sealing plate 61
... Circular through hole for upper electrode shaft 62 ... O-rings 63a, 63b
... Side O-ring 70 ... Fixed seal plate 70a ... Housing plate 70b ... Press plate 71 ... Circular through hole for lower electrode shaft
72 ... Small diameter oval hole 73 ... Large diameter oval hole 74,75 ... O-ring 76 ... Oval through hole 77 ... Upper electrode shaft movement space

Claims (1)

[Claims] 1. A vacuum chamber in which an object to be welded is placed and a vacuum is drawn, a fixed-side electrode shaft having a disk rotating electrode attached to its tip, and a tip arranged in parallel with this fixed-side electrode shaft. A movable-side electrode shaft having a disk rotating electrode attached to a portion thereof, and movable-side electrode shaft moving means for moving the movable-side electrode shaft toward and away from the fixed-side electrode shaft. A seam welding machine main body, which is arranged outside the vacuum chamber in a state where a shaft is projected into the vacuum chamber, holds the object to be welded by the both disk rotating electrodes, pressurizes and energizes, and performs seam welding, A sealing device for vacuum-sealing the penetrating portions of the both electrode shafts into the vacuum chamber , wherein the sealing device has an inner circumference of a through hole through which the movable electrode shaft is rotatably penetrated.
Seal ring that can adhere to the outer surface of the movable electrode shaft
And side seal ring on the side.
The inner circumference of the movable seal plate fitted to the movable side electrode shaft and the through hole through which the fixed side electrode shaft is rotatably penetrated.
Seal ring that can adhere to the outer surface of the fixed side electrode shaft
Before the movable seal plate is fitted
The movable side electrode shaft moves away from and approaches the fixed side electrode shaft.
And the side seal of the movable seal plate.
The ring has a sealing surface that allows close contact
It has a movable side electrode shaft moving space and is installed in the vacuum chamber.
Remove the two electrode shafts at the positions of the holes to project.
A vacuum seam welding device comprising a fixed seal plate attached thereto.