JPH0336631B2 - - Google Patents

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a seam welding method in which a workpiece to be welded is automatically welded continuously in the X-axis direction and Y-axis direction on a horizontal plane using a disc electrode. The present invention relates to a seam welding method and an apparatus for automatically welding seams.

``Prior Art'' Conventionally, as a seam welding method and apparatus for welding, for example, the stainless steel top of a stainless steel sink and a stainless steel sink over the entire circumference of the latter, the method and apparatus disclosed in Japanese Patent Publication No. 58-46393 has been known. It is being

A first slider is attached to the lower side of the horizontal swing arm so as to be slidable in the direction of the swing center.
A rotary member is pivotally attached to the lower side of the slider so as to be horizontally rotatable, and a second
A second slider is slidably mounted, a cylinder device is attached to the lower side of this second slider, the cylinder device is attached to the lower end of the piston rod, a motor for rotating the disk electrode is fixed to the lower end of the piston rod, and A copying plate is fixedly installed at a predetermined position below the horizontal rotating arm, and a copying roller pivotally supported by the rotating member is slidably fitted into a copying groove formed on the top surface of the copying plate. be. When welding the stainless steel top and stainless steel sink, which are the objects to be welded, they are fixed on a mounting table in a fixed position via a backing copper plate, and the motor is lowered using a cylinder device. After the disk electrode is brought into pressure contact with the stainless steel top from above, the horizontal rotating arm is rotated to roll the copying roller along the copying groove. By sliding the slider, the disk electrode is moved along the tracing groove to perform welding work.

``Problems to be Solved by the Invention'' However, in order to move the disk electrode along the profiling groove, it is difficult to move the disk electrode along the profiling groove by rotating the horizontal rotating arm, sliding the first and second sliders, and moving the rotating member horizontally. Complex movements such as rotation must be performed at the same time, which not only requires a large amount of power, but also causes uneven welding because the movements are not carried out smoothly, and also requires a variety of operations that can make the entire device large-scale. There was a problem.

An object of the present invention is to provide a seam welding method and apparatus that are free from such problems.

"Means for Solving the Problems" The seam welding method of the present invention forms a tracing groove along the welding line of the workpiece, and a slide table having an outer peripheral surface shaped similar to the tracing groove.
A cam follower that supports the mounting table so as to be able to swing up and down, and is rotatably supported in a predetermined position and fitted into the tracing groove, and a cam follower that is rotatably supported opposite to this and presses the outer circumferential surface. Pressing the slide table with the reference roller, placing the workpiece on the mounting table, and holding the workpiece on the welding line between the upper and lower disk electrodes rotating at a predetermined position, The propulsive force generated by the rotation of these disc electrodes is transmitted to the slide table via the workpiece and the mounting table, and by sliding it horizontally along the tracing groove, the workpiece is aligned with the welding line relative to the upper and lower disc electrodes. It is characterized by moving along the

Furthermore, the seam welding device of the present invention includes a base having a large number of free rollers pivotally supported on the upper surface thereof, and the device is horizontally slidable on these free rollers, and the four corners are arcuate along the welding line of the workpiece. A tracing groove is formed on the lower surface, and the outer circumferential surface is shaped similar to the tracing groove, and rotation center holes are bored at the center positions of the circular arcs at the four corners of the tracing groove, and each rotation center hole is A slide table having a rotation pin protruding from a predetermined position on an upper surface that is more distant from the upper surface; a cam follower that is fitted in the tracing groove and rotatably supported at a predetermined position on the base; and the slide table is a cam follower. A reference roller is also rotatably supported at a predetermined position on the base so as to press together, and a fulcrum pin vertical movement mechanism that removably fits the fulcrum pin into the rotation center hole at a predetermined position on the base. a rotation mechanism that pushes the rotation pin to rotate the slide table around the fulcrum pin; a mounting table that is supported on the slide table so as to be vertically swingable via a spring coupling mechanism; The object to be welded placed on the mounting table is rotated while being held between the upper and lower sides above the reference roller, and the rotational force is used to propel the object to be welded onto the slide table via the mounting table and the spring coupling mechanism. It is characterized by comprising upper and lower disc electrodes that give

"Operation" According to the method of the present invention, the workpiece to be welded is moved along the tracing groove on the lower surface of the slide table along with the slide table by the rotational force of the upper and lower disk electrodes that rotate in a fixed position. Therefore, no special mechanism is required to move it. The table on which the workpiece is placed can swing up and down relative to the slide table, so even if the thickness of the welded part of the workpiece is uneven, the upper and lower disk electrodes always maintain constant conditions. It is held between the The slide table is compressed by the cam follower that fits in the tracing groove and the reference roller that presses the outer circumferential surface, so that the slide table moves horizontally in precisely following the tracing groove.

Further, according to the seam welding device of the present invention, the slide table is smoothly slid horizontally on the base by the free rollers, and is smoothly moved around the fulcrum pin as the rotation mechanism pushes the rotation pin. It is rotated while moving precisely along the arcs of the four corners of the weld line of the workpiece.

``Example'' An example of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 to 3, a base 1 is supported horizontally by a number of adjustment legs 2. As shown in FIGS. This base 1
On the top surface, a large number of free rollers 3 are rotatably supported in a row on a grooved steel 4, and a reference roller 5 and a cam follower 6, which have flanges at both upper and lower ends, are mounted at predetermined positions. The reference rollers 5 are rotatably supported opposite each other at a distance, and a fulcrum pin guide cylinder 7 is fixed on an extension line connecting the center of these reference rollers 5 and the center of the cam follower 6, as shown in FIG. The reference roller 5 is directly supported by the base 1, while the cam follower 6 is supported by a bracket 8 projecting from the fulcrum pin guide tube 7.

An air cylinder 9 for vertical movement of the fulcrum pin is attached to the lower surface of the base 1 below the fulcrum pin guide cylinder 7, and a fulcrum pin that is slidably fitted into the fulcrum pin guide cylinder 7 is attached to the piston rod of the air cylinder 9. 10 is fixed.

A slide table 11 is placed on the base 1 and horizontally swings on its free rollers 3.

As shown in FIGS. 4 and 5, this slide table 11 has a rectangular shape with four arcuate corners 11a, and has welding lines of the workpiece to be welded on the peripheral edge of the lower surface.
For example, in the case of a stainless steel sink S (Figs. ₁ and 2), the four corners 12a form a circular groove 12 along the periphery of the top opening of the stainless steel sink S1, and the sliding table 11 The outer peripheral edge has a similar shape to the tracing groove 12. This tracing groove 12 has a T-shaped cross section, and has stepped portions 12b on both side peripheries.
The cam follower 6 is fitted into this tracing groove 12 without coming off, and the slide table 1
1 is pinched by the cam follower 6 and the reference roller 5, and is slid according to the shape of the tracing groove 12 as will be described later. In addition, slide table 11
A rotation center hole 13 is bored at the center position of the circular arc of each corner 12a of the tracing groove 12, and a rotation pin 14 is provided protruding from the top surface of each rotation center hole 13 at a predetermined distance from the rotation center hole 13. are doing. A bush 15 is fitted into each rotation center hole 13.

On the top surface of the slide table 11, a mounting table 16 for placing a sink S is horizontally installed so as to be vertically swingable by a spring cushion mechanism, that is, three spring cushion cylinders 17 and 18. . The upper surface of this mounting table 16 is curved along the outer bottom surface of the stainless steel sink _S1 , and forms a circular recess 16a that corresponds to the sink opening _S3 at the bottom of the stainless steel sink _S1 . A sink fixing hole 16b is bored in the center of the sink.

In order to fix the stainless steel sink S ₁ on the mounting table 16, a sink fixing air cylinder 16 is prepared, and the piston rod 20 of this air cylinder 19 is passed through the sink fixing hole 16b.
By holding the bottom of the stainless steel sink S 1 between the head 20a at the tip and the pressing plate 21 fixed to the air cylinder 19, the stainless steel sink _{S 1}
is positioned and fixed on the upper surface of the mounting table 16.

On the other hand, a frame 22 located above the base 1
Upper and lower disk electrodes 23 and 24 are attached to the. The lower disk electrode 24 is attached to the frame 22
It is fixed to the tip of a shaft 26 which is rotatably supported by a bearing 25 on the lower frame 22a, and the rotation of a motor (not shown) is transmitted through the shaft 26, so that it always rotates at a fixed position. On the other hand, the upper disk electrode 23 is attached to a bearing stand 2 which is vertically movably mounted under the upper stand 22b of the frame 22.
It is pivoted on 7. This bearing stand 27 is fixed to the lower end of the piston rod of an air cylinder 28 for electrode up and down mounted on the upper mount 22b, and when the air cylinder 28 is operated, the upper disk electrode 23 is connected to the lower disk electrode 24. It is vertically raised or lowered along the guide rod 29 directly above.

Therefore, the stainless steel sink S ₁ is fixed on the mounting table 16 as described above, and the stainless steel top is placed on top of it.
After placing S ₂ , when the bearing stand 27 is lowered, the stainless steel top is moved by the upper disk electric leg 23.
While S ₂ is being pushed down, the mounting table 16 descends against the springs of the spring cushion cylinders 17 and 18, and the overlapping portion of the stainless steel top S ₂ and the stainless steel sink S ₁ is connected to the upper and lower disk electrodes 23 and 2.
4. When the lower disk electrode 24 is rotated in this state, the stainless steel sink S ₁
and the stainless steel top S ₂ are propelled while being superposed, and the upper disk electrode 23 is driven to rotate, and the propulsion force of the sink S is applied to the slide table 11 via the mounting table 16 and spring cushion cylinders 17 and 18. The slide table 11 slides on the free roller 3.

In order to determine the starting point of sliding of this slide table 11, a third,
As shown in FIGS. 6 and 7, a plate-shaped stopper 30 is rotatably (up and down) pivotally mounted by a rotating shaft 32 supported by a pair of bearings 31. Rotating axis 3
2 is connected via a link 35 to a piston rod 34 of a stopper raising/lowering air cylinder 33 pivotally attached to the lower side of the base 1, and the air cylinder 3
It is raised and lowered by the operation of 3. The link 35 passes through a groove 36 provided in the base 1. In addition, the base 1 is provided with an X-axis direction and a Y-axis direction in FIG.
An X-axis guide groove 37 and a Y-axis guide groove 38 are bored in the axial direction. The Y-axis guide groove 38 extends along an extended line connecting the centers of the reference roller 5 and the cam follower 6. An X-axis press roller 39 is placed in the X-axis guide groove 37, and a Y-axis press roller 40 is placed in the Y-axis guide groove 38.
Each is explained as follows.

That is, as shown in FIG.
This Y-axis sliding table 42 is rotatably supported by a piston rod 45 of a Y-axis sliding air cylinder 44 attached to the lower side of the base 1.
The Y-axis pressing roller 40 is linearly slid in the Y-axis direction by the operation of an air cylinder 44. Further, as shown in FIGS. 1 and 2, the X-axis roller 39 is pivotally supported on an X-axis sliding table 47 that slides along an X-axis rail 46, and is operated by an X-axis sliding air cylinder 48. and is slid linearly in the X-axis direction. After the stopper 30 is raised, the X-axis roller 39 and the Y-axis roller 40 simultaneously slide and press the slide table in the X-axis direction and the Y-axis direction as shown in FIG. 11 is pressed against the stopper 30 and positioned at a predetermined position (original position) on the base 1.

Furthermore, a turning air cylinder 49 is pivotally mounted on the base 1 so as to be movable. At the tip of the piston rod of this air cylinder 49,
A pusher 50 having a V-shaped tip for pushing the turning pin 14 on the slide table 11 is fixed.

The sink S fixed on the mounting table 16 as described above is welded by the upper and lower disk electrodes 23 and 24, which rotate at a predetermined position while being moved as follows.

First, the slide table 11 is moved to the stopper 30.
As described above, it is positioned in the horizontally elongated state in FIG. 3 by the X-axis pressing roller 39 and the Y-axis pressing roller 40.

Thereafter, the lower disk electrode 24 immediately rotates, the stopper 30 falls down, and at the same time the X-axis pressing roller 39 retreats, so that the slide table 11, along with the mounting table 16 and the sink S, moves along the lower surface. It is slid to the left in FIG. 3 along the groove 12, and one long edge of the matching portion of the stainless steel top _S2 of the sink S and the stainless steel sink _S1 is welded.

When a sensor (not shown) detects that the turning center hole 13 in one corner of the slide table 11 is located directly below the fulcrum pin 10, the air cylinder 9 for vertically moving the fulcrum pin is activated to move the fulcrum pin 10.
is fitted into the turning center hole 13, the Y-axis sliding air cylinder 44 is activated, and the Y-axis pressing roller 40, which was pressing one long side edge of the slide table 11, retreats. At the same time, the turning air cylinder 49 is actuated to move its piston rod forward, and the turning pin 14 corresponding to the turning center hole 13 is pushed by the pusher 50 at its tip, so that the slide table 11 is moved forward. It is rotated 90 degrees around the fulcrum pin 10. With this rotation, the corner portions of the stainless steel top S ₂ and the stainless steel sink S ₁ are continuously welded in an arc shape.

After that, the fulcrum pin 10 is pulled out from the turning center hole 13, and the Y-axis pressing roller 40 is moved forward again, this time pressing one short side edge of the slide table 11, and while receiving this pressure, the slide table 11 is continuously slid to the left in FIG. 3 along the profiling groove 12 in a vertically elongated state, and this time one short side edge of the mating portion of the stainless steel top S ₂ and the stainless steel sink S ₁ is welded. Ru. Due to this swinging, another rotation center hole 13 of the slide table 11 is detected, and when the fulcrum pin 10 is fitted into the rotation center hole 13, the Y-axis pressing roller 40 retreats and the rotation air cylinder 49 is activated again. The slide table 11 is rotated by 90 degrees, and the other corners of the stainless steel top S ₂ and the stainless steel sink S ₁ are welded in an arc shape while the slide table 1 is rotated 90 degrees.
1 is in a horizontally elongated state in FIG. Then, Y
The shaft pressing roller 40 advances and the slide table 1
1 is pressed again, the slide table 11 is slid along the tracing groove 12 in a horizontally long state, and the rotation center hole 1 is
3 is located directly below the fulcrum pin 10, and is rotated in the same manner as above.

In this way, the slide table 11 is rotated at least once according to the shape of the tracing groove 12 on its lower surface, and the mating portions of the stainless steel top S ₂ and the stainless steel sink S ₁ are continuously welded along the entire circumference along the tracing groove 12. .

Note that in the above embodiment, the lower disk electrode 24
Only the upper disk electrode 23 was driven to rotate, and the upper disk electrode 23 was driven to rotate, but both the upper and lower disk electrodes 23 and 24
Both may be driven and rotated.

"Effects of the Invention" As detailed above, the seam welding method of the present invention has the following effects.

While the slide table is being held between the cam follower fitted in the tracing groove and the reference roller pressing the outer peripheral surface, the slide table is placed on the mounting table along the tracing groove by the rotational force of the upper and lower disk electrodes. Since the welding object is moved together with the welded object, there is no need for a dedicated drive mechanism to move them, and compared to the conventional method of moving the upper and lower disk electrodes, it requires less power.
The object to be welded can be moved smoothly,
Welding unevenness is also reduced.

The table on which the workpiece is placed can be moved up and down relative to the slide table, so even if the thickness of the welded part is uneven, the workpiece is always kept under constant conditions by the upper and lower disk electrodes. The workpiece can be welded accurately along the welding line because the slide table is held in place by the cam follower fitted in the tracing groove and the reference roller that presses the outer circumferential surface of the slide table. can.

Further, according to the seam welding device of the present invention, the slide table can be horizontally oscillated smoothly by the free roller, and can also be moved smoothly around the fulcrum pin as the rotation mechanism pushes the rotation pin. The object to be welded can be rotated while accurately moving along the arcs of the four corners of the weld line.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which FIG. 1 is a front view, FIG. 2 is a partially cutaway side view, FIG. 3 is a simplified plan view, and FIG. 4 is an enlarged cross-sectional view taken along the - line in FIG. Fifth
The figure is a partially cutaway plan view of the slide table, No. 6,
FIG. 7 is a partially cutaway rear view and side view of the mechanism for raising and lowering the stopper. S ₁ , S ₂ ... Stainless steel sink and stainless steel top of the sink, which are objects to be welded, 12, 12a ...
Tracing groove and its arcuate corner portion, 11...Slide table, 16... Mounting table, 6... Cam follower, 5... Reference roller, 23, 24... Upper and lower disk electrodes, 3... Free roller, DESCRIPTION OF SYMBOLS 1... Base, 13... Turning center hole, 14... Turning pin, 10... Fulcrum pin, 9... Air cylinder for vertical movement of fulcrum pin, 49... Air cylinder for turning, 17, 18... Spring shoes cylinder.

Claims (1)

[Scope of Claims] 1. A mounting table is supported so as to be vertically swingable on a slide table on which a tracing groove is formed along the welding line of the object to be welded and the outer peripheral surface has a shape similar to the tracing groove, and The slide table is pinched by a cam follower that is rotatably supported in a predetermined position and fitted into the tracing groove, and a reference roller that is rotatably supported and presses the outer circumferential surface facing the cam follower, and the slide table is compressed as described above. With the object to be welded placed on the mounting table, the object to be welded is held between the upper and lower disk electrodes rotating at a predetermined position on the welding line,
The propulsive force generated by the rotation of these disc electrodes is transmitted to the slide table via the workpiece and the mounting table, and by sliding it horizontally along the tracing groove, the workpiece is aligned with the welding line relative to the upper and lower disc electrodes. A seam welding method characterized by moving along the seam. 2. A base with a large number of free rollers pivoted on its upper surface, and a base that is horizontally slidably placed on these free rollers, and a tracing groove whose four corners form an arc along the welding line of the workpiece is formed on the lower surface. At the same time, the outer circumferential surface is made to have a shape similar to this tracing groove, and turning center holes are bored at the center positions of the circular arcs at the four corners of the tracing groove, and at predetermined positions on the upper surface separated from each turning center hole. A slide table with a protruding rotation pin, a cam follower that is fitted into the tracing groove and rotatably supported at a predetermined position on the base, and a base that is used to clamp the slide table together with the cam follower. A reference roller rotatably supported at a predetermined position on the base, a fulcrum pin vertical movement mechanism for removably fitting the fulcrum pin into the rotation center hole at a predetermined position on the base, and a branch pin of the reference roller. a rotation mechanism that pushes the rotation pin to rotate the slide table; a mounting table supported on the slide table so as to be vertically swingable via a spring cushion mechanism; The object to be welded is rotated while being held between the upper and lower sides above the reference roller, and the rotating force is used to propel the object to be welded to the slide table via the mounting table and the spring cushion mechanism. A seam welding device comprising: