JPS632232Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a seam welding device, and more particularly to a seam welding device in which a workpiece (object to be welded) fixing mechanism and an electrode pressurizing mechanism are improved.

[Background of the idea]

As shown in FIG. 1, a conventional seam welding device has a bearing bracket 1 fixed to a base 10.
An arm 16 is rotatably fixed to the shaft 14 of 2,
A workpiece positioning frame 22 is attached via a rotating shaft 20 supported by the shaft 18 of the arm 16 . A guide device 28 is attached to the copying device mounting base 26 fixed to the shaft 24 of the workpiece positioning frame 22.
A workpiece positioning table 32 is supported by the guide device 28 and spring 30. The workpiece 34 set on the workpiece positioning table 32 is pressed from above by a workpiece holder 36 to hold the workpiece 34. This work holder 36 can be slid up and down by driving the pressure cylinder 38.

Reference numerals 40 and 42 denote a seam welding line tracing guide and a tracing pin, which determine the locus of the welding line to be seam welded to the flange 44 of the workpiece 34.

Further, an upper roller electrode 46 and a lower roller electrode 48, which are vertically opposed to each other with a flange 44 in between, are supported by an upper electrode guide 50 and a lower electrode guide 52, respectively. The upper electrode guide 50 is connected to the upper roller electrode 46 by driving the air cylinder 54.
can be slid up and down. The lower electrode guide 52 is fixed onto a frame 58 via a jack 56. The jack 56 can move the lower electrode guide 52 up and down when the lower roller electrode 48 is worn out.

When welding the workpiece 34, the lower roller electrode 48 is fixed in the vertical direction, and the flange 44 of the workpiece 34 is held in place by the workpiece holder 36.
After adjusting the pressure so that it lightly touches 8,
As shown in FIG. 2, air adjusted to the required pressing force by the pressure regulating valve 60 is supplied to the air cylinder 54 via the direction switching valve 62, and the upper roller is driven by the air cylinder 54. The electrode 46 is driven downward. The flange 44 is pressurized by the lower roller electrode 48 and the upper roller electrode 46 to perform welding.

However, in the conventional device, the lower roller electrode 48
is fixed, and a workpiece 34 is placed on a positioning table 32 that is floating up and down with a spring 30 or the like,
The workpiece 34 was pressed against the lower roller electrode 48 by the workpiece presser 36, and then the flange 44 was pressed by the upper roller electrode 46.
For this reason, conventional devices have had the following problems.

(1) An eccentric load is applied to the workpiece 34 due to the reaction force of the workpiece holding force and the lower roller electrode 48, and the roller electrode does not hit the flange surface at right angles, and welding is performed with prying, resulting in the welding part of the workpiece 34 Welding defects such as cracking occur.

(2) In order to reduce the eccentric load, the workpiece holding force cannot be made too strong, so the workpiece 34 cannot be held securely, and the workpiece 34 may shift due to the tensile force of the roller electrode or the inertia force when the jig rotates. , the weld line of the device may shift or come off the flange surface.

(3) It is necessary to constantly adjust the height of the lower roller electrode 48 due to wear of the roller electrode.

In this way, in the conventional device, the lower roller electrode 4
8 and the upper roller electrode 46 is applied to the workpiece 34.
Since the welding material is not evenly applied to the flange 44, it is not possible to improve the welding quality.

[Purpose of invention]

The present invention was developed in view of the above-mentioned conventional problems, and its purpose is to enable the pressing force from the upper and lower roller electrodes to be applied evenly to the workpiece, so that the upper and lower roller electrodes can smoothly follow the workpiece surface. An object of the present invention is to provide a seam welding device.

[Summary of the idea]

In order to achieve the above object, the present invention includes a lower holding mechanism that holds a placed workpiece at a constant height and is capable of positioning and copying the workpiece, and a lower holding mechanism that presses the workpiece held by the lower holding mechanism from above. an upper holding mechanism that holds the workpiece, a pair of roller electrodes that are vertically opposed to each other with the work held by the holding mechanisms interposed therebetween; an upper cylinder that slides the upper roller electrode; and an upper cylinder that slides the lower roller electrode. an upper auxiliary cylinder that urges the upper roller electrode and the upper cylinder upward; and a lower auxiliary cylinder that urges the lower roller electrode and the lower cylinder upward, and the upper cylinder and the lower cylinder are driven in the same way. The upper cylinder is driven downward by applying equal driving force from the source, and the lower cylinder is driven upward, and the loads caused by driving the upper roller electrode and the lower roller electrode are canceled respectively, and the force due to the downward driving of the upper roller electrode is reduced. The upper auxiliary cylinder and the lower auxiliary cylinder are driven with an urging force such that the upper and lower auxiliary cylinders are equalized with the force caused by the upward drive of the lower roller electrode, and welding is performed by applying pressing force from the upper and lower roller electrodes to the workpiece.

[Example of idea]

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

3 and 4 show the structure of an embodiment of the present invention.

In the apparatus in this embodiment, a workpiece positioning device 64 and a copying device mount 66 are integrated, and the copying device mount 66 is fixed to the workpiece positioning frame 22 via a shaft 24 to constitute a lower holding mechanism. . This lower holding mechanism holds the workpiece 34 at a constant height without causing the workpiece 34 pressed by the workpiece holder 36 constituting the upper holding mechanism to float up and down, and enables positioning and copying of the workpiece 34. It is configured.

Further, the upper roller electrode 70 and the lower roller electrode 72, which are vertically opposed to each other with the flange 44 of the workpiece 34 in between, are connected to upper electrode guides 74 and 7, respectively.
6, 78, and are connected to lower electrode guides 80, 82, 84. Upper electrode guide 74, 76, 78
can each slide up and down by driving an upper air cylinder 86 fixed to the frame 58, and lower electrode guides 80, 82, 84 can slide up and down by driving a lower air cylinder 92. . In this embodiment, the same or equivalent parts as those shown in FIG. 1 are given the same reference numerals.

Here, since the present invention is characterized in that the pressure force applied by the upper and lower roller electrodes 70 and 72 is applied equally to the workpiece 34, the air cylinder drive system in this embodiment is constructed as shown in FIG. There is.

That is, as shown in FIG.
The air adjusted to a predetermined pressure by
Pressure port 10 of upper air cylinder 86 via
0 and the pressurizing port 102 of the lower air cylinder 92. Furthermore, the ports 104, 106 of the upper auxiliary air cylinders 88, 90 and the ports 108, 110 of the lower auxiliary cylinders 94, 96,
The pressure regulating valves 112 and 114 are adjusted to the pressure at which the weight of the upper roller electrode section and the weight of the lower roller electrode section become equal.
Adjusted air is constantly supplied.

In this embodiment, when the upper roller electrode 70 slides downward by the drive of the upper air cylinder 86, the upper auxiliary air cylinders 88, 9
When the lower roller electrode 72 slides upward by the drive of the lower air cylinder 92, the lower auxiliary air cylinders 94 and 96 By driving, the lower electrode part is urged upward in balance with its own weight, and each urging force is adjusted so as not to affect the load accompanying the driving of the upper roller electrode 70 and the lower roller electrode 72. Only the pressing forces of the upper roller electrode 70 and the lower roller electrode 72 are equally applied to the flange 44. Furthermore, since equal driving force is applied to the upper air cylinder 86 and the lower air cylinder 92 from the same driving source, if one roller electrode contacts the flange 44 first, the contacting roller The air supplied to the electrode is supplied to the other roller electrode, and the pressing force of both roller electrodes becomes equal.

In this way, in this embodiment, the pressure applied by the upper and lower roller electrodes 70 and 72 is evenly applied to the flange 44.
Therefore, it is possible to prevent unreasonable twisting or eccentric loads from being applied to the workpiece 34.

Further, since the upper and lower roller electrodes can smoothly follow the surface of the workpiece 34, there will be no misalignment of the welding line or welding defects. Furthermore, even if the roller electrode wears out, the roller electrode follows the workpiece, so there is no need to adjust the position of the roller electrode.

Further, in the embodiment, the upper auxiliary air cylinders 88, 90 and the lower auxiliary air cylinders 94, 96
The air supply system includes air tanks 114 and 116.
is provided, so even if the pressure of this air supply system fluctuates rapidly, this pressure fluctuation can be absorbed.

In the embodiment described above, the valves are switched by operating the direction switching valve 62, and the air in the upper air cylinder 86 and the lower air cylinder 92 is transferred to the pressurizing port 1.
00,102 and open port 118,1
By supplying from 20, the upper roller electrode 7
0 can be driven upward, and the lower roller electrode 72 can be driven downward.

Further, in the above embodiment, the upper air cylinder 8
Although it is necessary to equalize the cylinder diameters of the lower air cylinder 6 and the lower air cylinder 92 so that the pressurizing force of both cylinders is equal, it is not necessary that the stroke lengths of each cylinder be equal.

[Effect of idea]

As explained above, according to the present invention, the pressure applied to the upper and lower roller electrodes is evenly applied to the workpiece surface, and each roller electrode can smoothly follow the workpiece surface, which has the advantage of improving welding quality. It has a positive effect.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a conventional device, FIG. 2 is an air supply system diagram of the device shown in FIG. 1, FIG. 3 is a side view of a seam welding device showing an embodiment of the present invention, and FIG. The arrow view along the A-A line in Figure 3, and Figure 5 is the 3rd view.
It is an air supply system diagram of the apparatus shown in a figure. 34...Work, 36...Work presser, 44...
...Flange, 64...Work positioning device, 66
... Copying device mounting base, 70 ... Upper roller electrode,
72... Lower roller electrode, 86... Upper air cylinder, 88, 90... Upper electrode balance air cylinder, 92... Lower air cylinder, 94, 9
6...Air cylinder for lower electrode balance.

Claims (1)

[Scope of utility model registration request] a lower holding mechanism that holds the placed workpiece at a constant height and is capable of positioning and copying the workpiece; an upper holding mechanism that presses and holds the workpiece held by the lower holding mechanism from above; and both of the above-mentioned holding mechanisms. A pair of roller electrodes arranged vertically opposite to each other with a workpiece held by a mechanism in between, an upper cylinder that slides on the upper roller electrode, a lower cylinder that slides on the lower roller electrode, and the upper roller electrode and the upper cylinder. an upper auxiliary cylinder that urges the lower roller electrode and the lower cylinder upward; and a lower auxiliary cylinder that urges the lower roller electrode and the lower cylinder upward. At the same time, the lower cylinder is driven upward, and the loads caused by driving the upper roller electrode and the lower roller electrode are offset, so that the force due to the downward drive of the upper roller electrode and the force due to the upward drive of the lower roller electrode are combined. A seam welding device characterized in that an upper auxiliary cylinder and a lower auxiliary cylinder are driven with equal biasing force, and pressing force from upper and lower roller electrodes is applied to a workpiece for welding.