JPS5855180A - Automatic whole circumference welding machine - Google Patents

Abstract

PURPOSE:To exactly jet a welding flame to a weld from a torch, and to elevate the welding accuracy, by providing a eccentric profiling mechanism and a height profiling mechanism, on a work profiling mechanism of an automatic welding machine for executing whole circumference welding of a work on a turntable. CONSTITUTION:Even if a torch 20 contacts with an intermediate support 61 of a support 6 of a work jig 3 which moves, following a rotation of a turntable 2, the intermediate support 61 turns, following a rotation of the turntable 2 by its contact force, and exerts no hindrance on the torch 20. Also, even if an error exists in a work 7 due to its working and assembling, the torch 20 always jets a welding flame to a welding part of the work 7 by an eccentric profiling mechanism 17 and a height profiling mechanism 18, which follow the error.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is mainly used for welding automobile exhaust and e-vehicles, and is equipped with a work jig having a support and a pace on a turntable, and a workpiece is placed on the pace. The present invention relates to an improvement in a full-circumference automatic welding machine that welds a predetermined portion of a workpiece, which is erected upright, supported by a support, and rotates with the rotation of the turntable, around the entire circumference.

In the above-mentioned all-around automatic welding machine, the support of the workpiece jig, which moves as the turntable rotates, hits the stationary torch, making it impossible to weld all around. It is said that the structure is such that it never happens. In a typical example, as shown in Fig. 1, a turntable C is installed on a U-shaped installation body and a workpiece jig is placed on the turntable C. The pace e and the lower support f of d are arranged, and the upper support support 1 is arranged hanging down from the turntable h installed on the arm g of the installation body a, and the rotation of the turntable Q and h is A split strut type structure that prevents the torch j from hitting the lower strut f and upper strut 1 that move together (the illustrated one is vertical, but this type also has a horizontal shape). Alternatively, as shown in Fig. 2, the turn table 2 and rotary torch stand m are installed on the installation space, and the turn table! A work jig p consisting of a pace n and a support 0 is installed above, and a torch q is installed on a rotary torch stand m. As shown in FIG. 3, welding is first carried out approximately 1/4 of the circumference from the outer circumference point A of the workpiece 8 located on the center line r connecting with the support column O, that is, 9
Welding is performed by rotating the rotary torch base m until the rotary torch base m is displaced by 0°, and at the same time when the rotary torch base m reaches the point where it is displaced by 90°, that is, the four points, and stops, the turn table! rotates in the direction of the arrow while spouting welding flame, and the remaining 3/4
During welding, the torch q stops at point A as shown in Figure 4, avoiding the fixed installation of support column 0, and welds the entire circumference of 360 minutes. There is a continuous punch type (torch rotating type) that has a structure that allows this.

However, while all of the conventional welding methods described above enable the targeted 360-degree welding, they also have the disadvantage of being complicated and large-sized, and also have the disadvantage that the structure of the support supports the shape of the workpiece. It cannot be applied to different exhaust types, and the shape of the exhaust differs depending on the car model.
Specialized machines for these were required. Therefore, not only does this cause an increase in costs, but it also requires a considerably large area of space for welding.

On the other hand, the workpiece, which is the object to be welded, has dimensional errors during processing and assembly errors resulting from this.

Therefore, in this type of all-around automatic welding machine, the torch must be set so as to follow these errors and always eject welding flame to a predetermined welding area. Therefore,
Conventionally, a workpiece copying mechanism is provided that follows errors in the workpiece and automatically sets the torch to a predetermined welding part.

However, since conventional workpiece copying mechanisms have an electrical detection structure, even if they can achieve the intended purpose, the structure is complex, the failure rate is high, and maintenance is poor. On top of that, it was expensive.

As mentioned above, in this type of all-around automatic welding machine, there are problems caused by the supports that make up the work jig, as well as
There are two major problems with workpiece copying mechanisms that deal with errors in processing and assembly of workpieces to be welded, and solutions to these problems have been desired.

Therefore, the present invention provides a full-circumference automatic welding machine that can solve each of the above problems at the same time.

Hereinafter, an embodiment of the present invention will be described based on FIG.

In the figure, 1 connects the turn letter and pull 2 to the upper part, and also rotates 1.06 times in both forward and reverse directions (approximately 580
) The positioner 13, which is displaced and stopped, is fixedly set on the turn table 2 via the pedestal 4, and is a work jig consisting of a pace 5 and a support 6 erected on the pace 5. be.

According to this workpiece jig 6, a workpiece 7 (the illustrated example is an automobile exhaust pipe) is erected on the pace 5, and is supported by the workpiece holding piece 8 of the support column 6.
- It is held by a clamp 9 provided on the stripe.

Then, by driving the positioner 1, the turn
The table 2 is displaced by 1.06 rotations in the forward or reverse direction and then stopped. At this time, the welded part A of the workpiece held by the workpiece jig 3 on the turntable 2 is also rotated 1.06 times along with the turntable 2. 06 Rotational displacement.

The support 6 of the work jig 3 is composed of an upper support 60°, an intermediate support 61, and a lower support 62, and
As shown in FIGS. 6 and 7, the intermediate strut 61 includes the upper strut 60 and the lower strut 6 that are erected on the same axis.
It consists of two U-shaped constituent columns 61a and 61b, which are placed between the two and are rotatable in the radial direction relative to the upper column 60 and the lower column 62.

Each upper arm 61c and lower arm 61d of this image composition support 61a161kl has a connecting gel) 10.1
1 is fixed vertically, and this connection del)10.
The upper arm 61c and the lower arm 61 (
Thrust type with race end surface protruding from the top or bottom surface of l
A bearing 12 is fitted and installed. The lower arm 61.1 has a lower support 62 fixed on the base 5.
is connected and fixed to the installation plate 62a with the connecting bolt 11,
Moreover, on the upper arm 61C, the above-mentioned both connecting I-ruts 10
The connection plate 13 of the image composition supports 611L and 61b is fitted into the
is installed, and on this connecting plate 13, an upper support column 60 which is removably tied with a connecting bolt 10 is erected and fixed.

Therefore, with the upper support 60 and the lower support 62 located on the same axis, each component support 61 of the intermediate support 61
&, 61b, as described above, is rotatable in the radial direction with respect to the upper support 6o and the lower support 62 as shown in the imaginary diagram. Therefore, even if the turntable 2 comes into contact with a stationary torch, which will be described later, while moving as the turntable 2 rotates, the contact force will cause the turntable 2 to move.
It rotates in the opposite direction to the direction of rotation of the torch and does not interfere with the torch, etc., and enables automatic welding of 360 degrees around the entire circumference.

In addition, the constituent columns of the intermediate column 61 are divided into two constituent columns 61a.
, 61b because if there is only one constituent column, the upper column 60, which is in a free state, will move together with the rotation of this constituent column, making it impossible to support the workpiece 7. be. Further, the reason why the constituent columns 61 & 61b are formed into a U-shape is that they can be rotated with a slight force, and at the same time, the column portions can be moved to a position where they do not interfere with the torch or the like.

Reference numeral 14 denotes a torch mount horizontally installed on a hydraulic lifting column 16 having a lifting rod 15. On this torch mount 14, a workpiece copying mechanism 19 consisting of an eccentric copying mechanism 17 and a height copying mechanism 18 is installed. , a torch 20 is installed.

The eccentric copying mechanism 17 includes a bracket (21.2) arranged and fixed to the torch mount 14 at a predetermined interval.
1, and is installed via two guide shafts 22 and 22 arranged at a predetermined interval. As shown in FIG.
. The air cylinder 28 is pivotally connected to the air cylinder 28. Therefore, when the air cylinder 28 is extended, the contact 25 moves horizontally forward together with the horizontal moving table 23, and conversely, when the air cylinder 28 is contracted, the contact 25 moves horizontally backward together with the horizontal moving table 23. Due to this action, when the workpiece 7 is set, the contact 25
Both rotating rollers 24, 24 are brought into contact with the outer peripheral surface B of the workpiece 7. At this time, the air cylinder 28 moves the contact 25 to 1
Both rotating rollers 24.degree. 24 are made to contact the outer circumferential surface B of the workpiece 7 with a rotational pressure, and at the same time extend and contract so that the contactor 25 can be moved in the front and back direction within a predetermined stroke range.

Further, the height copying mechanism 18 is fixed to a seesaw set installation body 29 fixedly installed on the horizontal moving table 23 of the eccentric copying mechanism 17, and to the front end of the upper arm 3o of this seesaw set installation body 29. and the tip horizontal bent part 31
A rod-shaped contactor 32 that contacts the horizontal end surface of the workpiece 7 (in the illustrated example, the lenyl-wrapped portion of the muffler) C.
An air cylinder is installed vertically at the rear end of the lower arm 33, and pivotally connects the tip of the piston 34 to a square-shaped bracket 35 fixed to the rear end of the horizontal moving table 23. It is composed of a cylinder 56. Therefore, when the air cylinder 36 is extended, the lower arm 33 rises using the pivot shaft 37 as a fulcrum, and the upper arm 30 descends together with the seesaw set installation body 29, and the contactor '52 descends, conversely, the air cylinder 36 When contracted, the lower arm 33 descends using the pivot shaft 37 as a fulcrum, and the contactor 52 rises together with the seesaw set installation body 29, which raises the upper arm 3o. Due to this action, when the work 7 is set, the tip horizontal bent portion 31 of the contact 32 is aligned with the horizontal end surface of the work 7.
contact with. At this time, the air cylinder 36
2 is brought into contact with the horizontal end surface 0 of the workpiece 7 with a predetermined pressure, and at the same time, the contactor 32 is expanded and contracted so as to be able to move vertically within a predetermined stroke range.

A torch 2o is fixedly installed on the contactor 32 of this height copying mechanism 18 via a bracket 38.

Furthermore, on the horizontal moving table 23, there is a seesaw set installation body 29.
Adjustment lut 69 for holding the lower arm 52 in a horizontal position
is provided. Further, in the figure, 4o is a control panel that automatically controls the positioner 1, the torch 20, etc.

In the all-around automatic welding machine of the above embodiment, the workpiece 7 is set on the workpiece jig 3 as described above, and
After setting the contact 25 of the eccentric copying mechanism 17 and the contact 32 of the height copying mechanism 18 in the workpiece copying mechanism 19, the turntable 2 is rotated by the positioner 16 and the welding flame is ejected from the torch 2o. are performed at the same time, thereby welding the welding portion A of the workpiece 7. At this time, when the turn table 2 rotates nearly 3/4 of the way, the support 6, which moves as the turn table 2 rotates, comes into contact with the torch 20, which is in a stationary state, at its intermediate support 61. However, in this case, the intermediate strut 6
As described above, each constituent column 61a + 6lb rotates in the radial direction with respect to the upper column 60 and the lower column 62, so the rotation of the turntable 2 is caused by the contact force of the torch 2o and the contacts 25, 32. Rotates to follow. Therefore, full circumference welding of 36o0 can be achieved without any problem. Positioner 1 sets turntable 2 to 1.06
The workpiece 7 is rotated and simultaneously stopped, and then the workpiece 7 set in the workpiece jig 3 is welded from the opposite direction by reversing the positioner 1.

On the other hand, both contacts 25 and 52 follow the outer peripheral surface B and horizontal end surface C of the rotating workpiece 7, and accordingly, the torch 20, which is linked to the workpiece copying mechanism 19, processes and assembles the workpiece 7. Even if there is the above error, welding flame can always be ejected to the welded part A. Next, when setting the same type of work 7, do so with both contacts 25 and 32 set.

Here, the specific structure of each air cylinder 28, 36 and its piping structure can be implemented using known techniques that can provide the above-mentioned effects, and do not have a special structure. For this reason, illustrations and explanations will be omitted. In addition, illustrations and explanations of the wiring and piping of the positioner 1, hydraulic lifting column 16, torch 20, etc. will be omitted for the same reason.

In summary, in the all-around automatic welding machine according to the present invention, the support of the work jig is constituted by an upper support, an intermediate support, and a lower support, and the intermediate support is arranged erected on the same axis. It consists of two crank-shaped constituent columns placed between an upper column and a lower column, and each of these constituent columns is connected to the upper column and the lower column so as to rotate in the radial direction. an eccentric copying mechanism that includes a contact that contacts the outer circumferential surface near the welded part of the contactor, a cylinder that expands and contracts within a predetermined stroke range while applying a predetermined pressure to the contact, and is connected to the eccentric copying mechanism. A workpiece consisting of a height tracing mechanism that is equipped with a contact that contacts the horizontal end surface near the welding part of the workpiece, and a cylinder that extends and contracts within a predetermined stroke range while applying a predetermined pressure to this contactor. Equipped with a copying mechanism,
In addition, since the torch is installed in the contact portion of the height tracing mechanism, as described in the embodiment, it is fixed at the intermediate support of the support that moves with the rotation of the turntable. Torch (and contact of workpiece copying mechanism)
Even if contact occurs, the constituent columns of the intermediate column will rotate following the rotation of the turntable due to the contact force, so the torch (and the contact of the workpiece copying mechanism) will not be affected. , 360, enables automatic welding all around the circumference. Furthermore, even if there are errors in machining or assembly of the workpiece, the torch automatically follows the error and always sprays the welding flame accurately at the welding part by the accompanying eccentric tracing mechanism and height tracing mechanism. This allows for highly accurate welding. Furthermore, the means that enables 560° automatic welding around the entire circumference simply improves only a part of the branch, and since the structure is simple, it does not need to be complicated and large like conventional methods. Moreover, since the workpiece copying mechanism has a simple mechanical structure, the failure rate is low, and maintenance is not only easy but also low friction. Since the upper support can be installed removably from above,
By simply replacing this upper support with one that matches the shape of the workpiece, it is possible to handle various workpieces, and this type of all-around automatic welding machine is more versatile than the conventional dedicated machine. You can solve all your problems at the same time.

Note that the workpiece to which the automatic welding machine of the present invention is applied is not limited to an automobile exhaust...ξIZO, but also any workpiece that has a similar shape and is welded all around or on the circumference. It can be widely applied. Furthermore, regarding the structure, it is not limited to the illustrated structure; for example, the structure of the support, eccentric copying mechanism, height copying mechanism, etc. can be modified in various ways without departing from the technical idea set forth in the claims. .

[Brief explanation of the drawing]

1 and 2 are side views showing a conventional all-around automatic welding machine, respectively, FIGS. 3 and 4 are plan views illustrating the welding process in the structure shown in FIG. 2, respectively, and FIG. The figure is a side view of the embodiment of the present invention, FIG. 6 is an enlarged longitudinal sectional side view showing the intermediate support portion, FIG. 7 is an enlarged cross-sectional plan view showing the intermediate support portion, and FIG. FIG. 3 is an enlarged plan view of a main part of a contactor. 2... Turn table, 3... Work jig, 5...
... Pace, 6... Support, 60... Upper support, 61
... Intermediate struts, 61a, 61b... Constituent struts, 62
...lower support, 7...work, 10.11...connection I-rut, 12...thrust bearing, 17...
・Eccentric copying mechanism, 18... Height copying mechanism, 19...
Workpiece copying mechanism, 20...torch, 25.52...
Contactor, 28.56...Air cylinder, A...Welded part, B...Outer circumferential surface, C...Horizontal end surface. Figure 1 Figure 2 Figure 8vA L

Claims (1)

[Claims] A work jig having a support and a rigid base is provided on the turn chisol, and the work is erected on the four bases,
In a full-circumference automatic welding machine that welds a predetermined part of a workpiece, which is supported by a support column and rotates as the turntable rotates, all around the workpiece, the support column of the workpiece jig is connected to an upper support column, an intermediate support support, and an intermediate support. The intermediate strut is composed of two crank-shaped constituent struts sandwiching the upper strut and the lower strut, which are erected on the same axis, and each of these constituent struts has an upper strut. It is connected to the support column and the lower support column so as to rotate in the radial direction, and also includes a contactor that contacts the outer circumferential surface of the workpiece near the welding part, and a contactor that is connected to the support column and the lower support column so as to rotate in the radial direction. vinegar)
an eccentric copying mechanism equipped with a cylinder that expands and contracts within a range of cr, and is connected to the eccentric copying mechanism;
A workpiece copying mechanism is equipped with a height copying mechanism that is equipped with a contact that contacts the horizontal end surface near the welding part of the workpiece, and a cylinder that extends and contracts within a predetermined stroke range while applying a predetermined pressure to this contactor. 1. A full-circle automatic welding machine characterized in that a torch is installed in a contact portion of the height copying mechanism.