JPS61245980A - Seam welding method and its equipment - Google Patents

Abstract

PURPOSE:To perform the seam welding disusing an exclusive moving mechanism by moving the body to be welded along the profiling line of the lower face of a sliding table with pinching it between the upper and lower discoid electrodes which rotate at a fixed position by its rotation force together with the sliding table. CONSTITUTION:A sliding table 11 is moved with a placing base 16 and the bodies S1, S2 to be welded placing it on board along a groove 12 by the rotation force of the upper and lower discoid electrodes 23, 24 with pinching the sliding table 11 by the cam follower 6 fitting it to its profile groove 12 and the reference roller 5 pressing the outer peripheral face. The exclusive driving mechanism for the movement is therefore disused, the motive power becomes less compared to the conventional method to move the upper and lower discoid electrodes and the welding unevenness is reduced as well with the smooth movement of the bodies S1, S2 to be welded. The bodies S1, S2 to be welded can correctly be welded along its welding line because of the bodies S1, S2 to be welded being moved as per the above by pinching with a fixed conditions always by the electrodes 23, 24 even if there is unevenness in the thickness of the welding part of the bodies to be welded due to the placing base 16 being set vertically rockably for the table 11.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Field of Application" The present invention is a method of welding a workpiece in the horizontal plane using a disk electrode.
The present invention relates to a seam welding method and apparatus for automatically welding continuously in the axial direction and the Y-axis direction.

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

A first slider is attached to the lower side of the horizontal swing arm so as to be slidable in the direction of the center of rotation, and a rotating member is pivoted to the lower side of the first slider so as to be horizontally rotatable. A second slider is slidably attached to the lower side of the rotating member, a cylinder device is attached to the lower side of the second slider, and a motor for rotating the disk electrode is fixed to the lower end of the piston rod, Further, 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 upper surface of the copying plate. It is. 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 a cylinder device is used to lower the motor to connect the disk electrode. After pressing the stainless steel top from above, the horizontal rotating arm is rotated to move the copying roller along the copying groove, and the rotating member is accordingly rotated horizontally, and the first and second sliders are slid. By moving the disc electrode along the tracing groove, welding work is performed.

[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 tracing groove by rotating the horizontal rotating arm, sliding the first and second sliders, and horizontally moving the rotating member. Complex movements such as rotation must be performed at the same time, which not only requires a large amount of power, but also causes various problems such as uneven welding because the movements are not performed smoothly, and the entire device becomes 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 is mounted on a slide table whose outer peripheral surface has a shape similar to the tracing groove. A cam follower that supports the mounting base so as to be able to swing up and down, and that is rotatably supported in a predetermined position and fitted into the copying groove, and a reference that is rotatably supported opposite the cam follower and presses the outer circumferential surface. The work to be welded is placed on the mounting table by pressing the slide table with the rollers, and while the work to be welded is being held between the upper and lower disc electrodes rotating at a predetermined position on the welding line. The driving force generated by the rotation of is transmitted to the slide table via the workpiece and the mounting table,
It is characterized by moving the workpiece to be welded along the welding line relative to the upper and lower disk electrodes by horizontally sliding it along the tracing groove.

In addition, the seam welding device of the present invention includes a base having a large number of free rollers pivotally supported on the upper surface, and a base that is horizontally slidable on these free rollers, and the four corners are moved along the welding line of the workpiece. A tracing groove forming an arc is formed on the lower surface, and the outer circumferential surface is shaped similar to the tracing groove, and turning center holes are bored at the center positions of the circular arcs at the four corners of the tracing groove. A slide table having a rotation pin protruding from a predetermined position on the upper surface away from the hole, a cam follower fitted in the tracing groove and rotatably supported at a predetermined position on the base, and the slide table connected to the cam follower. A reference roller is also rotatably supported at a predetermined position on the base for pinching together with the fulcrum pin, and upper and lower fulcrum pins that removably fit the fulcrum pin into the rotation center hole at a predetermined position on the base. a rotating mechanism that pushes the rotation pin to rotate the slide table around its fulcrum pin; a mounting table supported on the slide table so as to be vertically swingable via a spring cushion mechanism; The object to be welded placed on this mounting table is rotated while being held between the upper and lower sides above the reference roller, and the rotational force provides a driving force to the slide table via the object to be welded, the mounting table, and the spring cushion mechanism. According to the method of the present invention, the workpiece to be welded is slid by the rotational force of the upper and lower disc electrodes while being held between the upper and lower disc electrodes rotating in a fixed position. Since it is moved together with the table along the tracing groove on the lower surface of the slide table, a dedicated mechanism for moving it is not required. Since the mounting table on which the workpiece is placed can swing up and down relative to the slide table, the workpiece is always held under constant conditions by the upper and lower disc electrodes even if the thickness of the welded part is uneven. be done. The slide table is pinched by a cam follower that fits into the profiling groove and a reference roller that presses the outer circumferential surface, so the table is accurately aligned with the profiling groove and is smoothly horizontally slid on the base by the free roller. As the rotation pin is pushed by the rotation mechanism, the object is rotated about the fulcrum pin smoothly and 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 below in detail based on the drawings.

In FIGS. 1 to 3, a base 1 is supported horizontally by a number of adjustment legs 2. As shown in FIGS. On the upper surface of the base 1, a large number of free rollers 3 are rotatably supported in a row on a groove type m4, and a reference roller 5 and a cam follower 6, which have flanges at both upper and lower ends, are installed at predetermined positions. are rotatably supported opposite each other at a predetermined interval, and a fourth
As shown in the figure, 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. The reference roller 5 is directly supported by the base 1, while the cam follower 6 is supported by a bracket 8 that projects from the fulcrum pin guide tube 7.

An air cylinder 9 for vertically moving the fulcrum pin is attached to the lower surface of the base l below the fulcrum pin guide tube 7, and the piston rod of the air cylinder 9 has a fulcrum that is slidably fitted into the fulcrum pin guide tube 7. A pin 10 is fixed.

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

As shown in Fig. 4.5, this slide table 11 has a rectangular shape with four corners 11a forming an arc shape, and has a welding line of the object to be welded, for example, a stainless steel sink S ( In the case of Fig. 1.2), stainless steel sink S
The four corner portions 12a form a tracing groove 12 having an arc shape along the periphery of the top opening of the slide table 11, and the outer peripheral edge of the slide table 11 has a shape similar to the tracing groove 12. This tracing groove 12 has a T-shaped cross section and has step portions 12b on both side peripheral edges, and the cam follower 6 is fitted into this tracing groove 12 without coming off, and the slide table 11 is connected to the cam follower 6 and the reference roller. 5, and the profiling groove 1
It is slid according to the shape of No. 2 as described below. In addition, the slide table 11 has a turning center hole 13 bored at the center position of the circular arc of each corner 12a of the tracing groove 12, and a turning effect is applied to each turning center hole 13 at a position on the upper surface separated from it by a predetermined distance. A pin 14 is provided protrudingly.

A bushing 15 is fitted into each turning center hole 13.

On the upper surface of the slide table 11, a mounting table 16 on which a sink S is placed is installed horizontally by a spring cushion mechanism, that is, three spring cushion cylinders 17 and 1B so as to be able to swing up and down. 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 sink.

In order to fix the stainless steel sink Sl on the mounting table 16, a sink fixing air cylinder 19 is prepared.
The piston rod 20 of this air cylinder 19 is passed through the sink fixing hole 16b, and the bottom part of the stainless steel sink S1 is held between the head 20a at the tip and the press plate 21 fixed to the air cylinder 19. The sink S1 is positioned and fixed on the upper surface of the mounting table 16.

On the other hand, upper and lower disk electrodes 23 and 24 are attached to the frame 22 located above the base l.

The lower disk electrode 24 is fixed to the tip of a shaft 26 that is supported by a bearing 25 on the lower pedestal 22a of the frame 22. The rotation of a motor (not shown) is transmitted to the lower disk electrode 24 through this shaft 26, and the lower disk electrode 24 is always kept at a constant state. Rotate in position. On the other hand, the upper disk electrode 23 is pivotally supported by a bearing stand 27 that is vertically movably mounted on the lower side of the frame 22b on the upper side of the frame 22. This bearing stand 27 is connected to the electrode upper and lower air cylinder 2 mounted on the upper stand 22b.
When the air cylinder 28 is operated, the upper disk electrode 23 is vertically raised or lowered along a guide rod 29 directly above the lower disk electrode 24.

Therefore, the stainless steel sink St is placed on the mounting table 1 as described above.
When the stainless steel top S2 is placed on top of the stainless steel top S2 and the bearing stand 27 is lowered, the stainless steel top S2 is not pushed down by the upper disc electrode 23, so the holding stand 16 is moved to the spring cushion cylinder 17.1.
The stainless steel top S2 descends against the spring of 8.
The overlapping portions of the stainless steel sink S1 and the stainless steel sink S1 are sandwiched between the upper and lower disk electrodes 23 and 24. When the lower disk electrode 24 is rotated in this state, the stainless steel sink S1
and the stainless steel top S2 are propelled while superimposed, and the upper disk electrode 23 is rotated accordingly, and the propulsive force of the sink S is transmitted 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 the slide table 11, a plate-shaped stopper 30 is mounted at a predetermined position on the upper surface of the base 1, as shown in FIG. The 0-rotation shaft 32, which is rotatably (undoably) pivoted by the rotary shaft 32, is connected to the piston rod 3 of the stopper undulation air cylinder 33, which is pivoted to the lower side of the base 1.
4 via a link 35, the air cylinder 3
It is raised and lowered by the operation of 3. Link 35 is base 1
It passes through a groove 36 provided in the. In addition, the base 1 has X-axis guide grooves 3 in the X-axis direction and the Y-axis direction in FIG.
7 and a Y-axis guide groove 38 are bored. Y-axis guide groove 3
8 is along an extension 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.
are explained as follows.

That is, as shown in FIG. 4, the Y-axis pressing roller 40 is rotatably supported by a shaft 43 on a Y-axis sliding base 42 that slides along a Y-axis seal 41 fixed to the lower side of the base 1. The Y-axis sliding table 42 is connected to a piston rod 45 of a Y-axis sliding air cylinder 44 attached to the lower side of the base 1, and the Y-axis pressing roller 40 controls the operation of the air cylinder 44. is slid linearly in the Y-axis direction. Further, as shown in FIG. 1.2, the X-axis roller 39 is pivotally supported on an X-axis sliding table 47 that slides along an X-axis seal 46, and the X-axis roller 39 is It is slid linearly in the axial direction. Then, after the -/pa 30 is erected, the X-axis roller 39 and the Y-axis roller 40
slide at the same time and press the slide table 11 in the X-axis direction and the Y-axis direction as shown in FIG. (original position).

Furthermore, a turning air cylinder 49 is pivotally mounted on the base 1 so as to be horizontally rotatable. This air cylinder 4
At the tip of piston loft 9, there is a slide table 11.
A pusher 50 with a V-shaped tip that pushes the upper rotation pin 14
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 are moved and rotated at predetermined positions as follows.

First, the slide table 11 is positioned in the horizontally elongated state in FIG. 3 as described above by the stopper 30, 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, traces the lower surface. It is slid to the left in FIG. 3 along the groove 12, and the 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 rotation center hole 13 in one corner of the slide table 11 is positioned directly below the fulcrum pin 10, the air cylinder 9 for vertically moving the fulcrum pin is activated to move the fulcrum pin 10 through the corresponding rotation. The Y-axis sliding air cylinder 44 is fitted into the center hole 13, and 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 activated and its piston rod moves 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 becomes the fulcrum. It is rotated 90 degrees around pin 10. Along with this rotation, stainless steel top S2 and stainless steel sink S
, are welded continuously in an arc shape at the corners.

After this, the fulcrum pin 10 is pulled out from the rotation center hole 13,
Further, the Y-axis pressing roller 40 is moved forward again, this time pressing one short side edge of the slide table 11, and while centralizing this pressure, the slide table 11 continues along the profiling groove 12 in a vertically long state as shown in FIG. and slid to the left in the figure.
This time, one short side edge of the mating portion of the stainless steel 7 tube S2 and the stainless steel sink S1 is welded. Due to this sliding, another turning center hole 13 of the slide table 11 is detected, and when the fulcrum pin 10 is fitted into the turning center hole 13,
As the Y-axis pressing roller 40 retreats, the rotation air cylinder 49 operates again, and the slide table 11 moves to 90.
As the slide table 11 is rotated, another corner of the stainless steel top S2 and the stainless steel sink S1 are welded in an arc shape, and the slide table 11 becomes horizontally elongated in FIG. 3. Then, the Y-axis pressing roller 40 advances and presses the slide table 11 again, and the slide table 11 is slid along the tracing groove 12 in a horizontally elongated state, and when the rotation center hole 13 is located directly below the fulcrum pin 10, Rotated as above.

In this way, the slide table 11 is rotated at least once according to the shape of the profiling groove 12 on its lower surface, and the mating portion of the stainless steel top S2 and the stainless steel sink S1 is aligned with the profiling groove 4.
Welding is performed continuously along the entire circumference along 12.

In the above embodiment, only the lower disk electrode 24 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 may be driven to rotate.

"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 that presses 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. Because it moves together with the workpiece, there is no need for a dedicated drive mechanism to move it, and compared to the conventional method of moving the upper and lower disk electrodes, it requires less power and moves the workpiece smoothly. This also reduces welding unevenness.

■ The table on which the workpiece is placed can swing up and down relative to the slide table, so the workpiece is always held under constant conditions by the upper and lower disk electrodes even if the thickness of the welded part is uneven. In addition, since the slide table is moved while being pressed by the cam follower that fits in the tracing groove and the reference roller that presses the outer peripheral surface, the welding table can be accurately released along the welding line of the workpiece. The rollers allow for smooth horizontal sliding, and as the rotation mechanism pushes the rotation pin, the workpiece moves smoothly around the fulcrum pin and precisely along the arcs of the four corners of the weld line of the workpiece. It can be rotated while

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, with the first figure being a front view and the second figure being a front view.
The figure is a partially cutaway side view, Figure 3 is a simplified plan view, Figure 4 is an enlarged sectional view taken along line I-I in Figure 3, Figure 5 is a partially cutaway plan view of the slide table, and Figures 6-7. 2 is a partially cutaway rear view and side view of a mechanism for raising and lowering a stopper. FIG. sl, s2... Stainless steel sink and stainless steel top of the sink to be welded, 12.12a...
... Tracing groove and its arcuate corner portion, 11...
・Slide table, 16...Placement table, 6...
...Cam follower, 5...Reference roller, 2
3.24... Upper and lower disk electrodes, 3...
...Free roller, 1...Base, 13...
...Turning center hole, 14...Turning pin, 1
0... Fulcrum pin, 9... Air cylinder for vertical movement of the fulcrum pin, 49... Air cylinder for turning, 17.18... Spring cushion cylinder.

Claims (1)

[Scope of Claims] 1. A mounting table is supported so as to be vertically swingable on a slide table which has a tracing groove formed along the welding line of the workpiece and whose outer peripheral surface has a shape similar to the tracing groove, In addition, the slide table is pinched by a cam follower that is rotatably supported at a predetermined position and fitted into the tracing groove, and a reference roller that is rotatably supported and presses the outer peripheral surface facing the cam follower. With the workpiece placed on the mounting table, the workpiece is held between the welding line by the upper and lower disk electrodes that rotate at a predetermined position, and the propulsive force generated by the rotation of these disk electrodes is applied to the workpiece and the workpiece. A seam welding method characterized in that the workpiece to be welded is moved along the welding line relative to the upper and lower disk electrodes by transmitting the information to the slide table via a mounting table and horizontally sliding the slide table according to the tracing groove. 2. A base with a number of free rollers pivotally supported on the upper surface, and a base that is horizontally slidably placed on these free rollers, and has a tracing groove on the lower surface whose four corners form an arc along the welding line of the workpiece. 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 having a rotation pin projecting thereon; a cam follower fitted in the tracing groove and rotatably supported at a predetermined position on the base; A reference roller also rotatably supported at a predetermined position on the base,
A fulcrum pin vertical movement mechanism that removably fits the fulcrum pin into the rotation center hole at a predetermined position on the base, and a rotation mechanism that pushes the rotation pin to rotate the slide table around the fulcrum pin. A mounting table is supported on a slide table so as to be able to swing up and down via a spring cushion mechanism, and the workpiece placed on this mounting table is rotated while being sandwiched from above and below above the reference roller. A seam welding apparatus comprising upper and lower disk electrodes that apply a driving force to a slide table through the rotational force of the workpiece, a mounting table, and a spring cushion mechanism.