JPH0775782B2 - Spot 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 spot welding device used for spot welding an inner ring to an inner peripheral surface of a liner cylinder of a combustor for a gas turbine.

[0002]

2. Description of the Related Art The liner used in this type of combustor is composed of a combination of a liner cylinder and an inner ring, and spot welding for joining them together is essential. Prior to performing this spot welding, as shown in FIG.
After mounting the enlarged inner ring 2 in the liner cylinder 1, the liner cylinder 1 is brought to the welding position of the spot welder 3, where the upper and lower electrodes 4, 5 are aligned with the welding point, and both electrodes 4 The spot welding is performed by energizing between 5 and 5.

[0003]

However, in the above-mentioned construction procedure, a gap is apt to occur when the inner ring 2 is enlarged and brought into close contact with the liner cylinder 1, and a welding failure occurs during construction of spot welding. There is a problem in that good bonding strength cannot be obtained.

On the other hand, a large number of spot welding points are arranged in the circumferential direction of the inner ring 2, and it is necessary to perform an indexing operation to correctly place the spot welding points between the upper and lower electrodes 4 and 5, but There is no suitable method for the vessel liner,
There is also a problem that it is not possible to improve work efficiency because the manual work requires a time-consuming method.

Therefore, an object of the present invention is to provide a spot welding apparatus capable of easily and efficiently indexing spot welding points arranged in the circumferential direction and preventing welding defects during spot welding. Especially.

[0006]

A spot welding apparatus according to the present invention is provided in a pedestal so as to be concentric with the pedestal axis.
A holding sleeve with an opening facing the lower end of the upper electrode, an electrode base provided inside the holding sleeve concentrically with the sleeve and having a plate base protruding from the opening, and a shaft of the electrode base. It has a plate larger means comprising wedge means disposed along the heart, provided to face the upper electrode, a ring holding means among which also serves as a lower electrode is engaged with the wedge means plate stand in front of the Within
The ring holding means is divided into a plurality of parts around the axis.
The members are formed, and these divided members are respectively formed by wedge means.
Perpendicular to the axis via a guide member fixed to the plate base
Spring that moves in the direction and always corresponds to each split member
The inner ring enlarging and holding device, which is biased in the axial direction by the, and the rear side of the electrode base are connected to each other. And an indexing device for placing.

[0007]

The liner cylinder for performing spot welding and the inner ring are held by the inner ring expansion holding device, and the spot welding point is placed between the upper electrode and the lower electrode, that is, the inner ring expansion holding device is provided. The plate enlarging means is operated, and the wedge means is operated to push the plate, which also serves as the lower electrode of the inner ring holding means, in the radial direction to spread the inner ring and bring the inner ring into close contact with the inner peripheral surface of the liner cylinder. As a result, the gap between the two becomes zero, and the spot welding is performed by energizing the lower electrode to the upper electrode while maintaining this close contact state.

On the other hand, in order to rotate the liner cylinder to place another spot welding point arranged in the circumferential direction between both electrodes, the indexing device is operated and the electrode base is rotated by a predetermined angle. The inner ring holding means is attached to the plate base of the electrode base, and rotates the liner cylinder by a predetermined amount according to the rotation of the electrode base. This allows the spot welding point adjacent to the previously welded spot welding point to be placed between the upper electrode and the lower electrode, and this operation can be automated to enable efficient indexing. become.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 2 shows a spot welder 13 for welding a liner cylinder 11 and an inner ring 12 constituting a combustor liner 10, and FIG. 3 shows a pedestal arranged in front of a frame 14 of the spot welder 13. The external appearance (details according to FIG. 1) of the spot welding apparatus according to the present invention mounted on the center of 15 are shown. The liner cylinder 11 is held together with the inner ring 12 by the inner ring expansion holding device of the spot welding apparatus according to the present invention, which will be described in detail later, and the upper electrode 16 that approaches the outside of the liner cylinder 10
The spot welding is performed by energizing with no gap between the and. The upper electrode 16 is supported by an electrode support arm 17 provided on the front surface of the frame 14. Further, as shown in FIG. 3, the inner ring enlarging holding means 18 is supported by an electrode base holding sleeve 19 provided at the center of the base 15. A conductor wire 20 for guiding electricity supplied from a power source (not shown) is connected to the electrode base holding sleeve 19. In addition, in FIG.
Reference numeral 21 indicates a stopper.

FIG. 1 shows the details of the spot welding device. A fluid cylinder 22, a connecting rod 23, and an automatic indexing device 25 are provided at one center of the electrode base holding sleeve 19. The automatic indexing device 25 is composed of an indexing gear 26, an indexing drive gear 27 and a motor 28. When the drive gear 27 is rotated by the driving force given by the motor 28, the indexing gear 26 that meshes with the drive gear 27 is determined. The electrode base, which will be described later, connected to the indexing gear 26 can be rotated by turning it by an angle. That is, the electrode base 29 is composed of a taper shaft 29a mounted in the tapered center hole 19a of the electrode base holding sleeve 19 and a plate base 29b provided at one end of the taper shaft 29a. In this embodiment, both are integrated. Is configured. The inner ring enlarging and holding device 18 provided on the electrode base 29 comprises an inner ring holding means 30 mounted on the front surface of the plate base 29b and a plate enlarging means 31 mounted on the center of the tapered shaft 29a, which is clearly shown in FIG. The latter is constructed as follows. The former will be described in detail with reference to another drawing described later.

That is, the plate expanding means 31 includes a fluid cylinder 32, a connecting rod 33, a cylindrical body 34 and a cylindrical wedge 35.
Are arranged on one axis, and the whole is mounted in the central hole 36 of the taper shaft 29a. When an operating pressure such as a hydraulic pressure is applied to the fluid cylinder 32, the cylindrical body 34 moves along the guide portion of the center hole 36 to reciprocate the cylindrical wedge 35.

FIG. 4 shows details of the inner ring holding means 30. That is, the inner ring holding means 30 is divided into four equally divided plates from one circular plate 37a, 37b.
(37c and 37d are not shown). The division plates 37a, 37b are four guide plates 38a, 38b, 38c fixed to the plate base 29b, respectively.
(38d is not shown) is held slidably in the radial direction,
It is normally urged toward the center by the spring 39.
The spring 39 is hung between a pin 40 fixed to the split plates 37a and 37b and a pin 41 fixed to the plate base 29b.

Further, the cylindrical wedge 35 is fitted into a tapered through hole formed at the center of each of the divided plates 37a and 37b, and the divided plates 37a and 37b are moved in the radial direction as the cylindrical wedge 35 reciprocates. Can be moved forward or backward.
More specifically, when the fluid cylinder 32 works and the cylindrical wedge 35 is pulled inward, the split plates 37a and 37b move in the radial direction by overcoming the spring force of the spring 39, and the diameter increases. And the outer ring is the inner ring
The inner ring is abutted against the inner surface of 12 and still expands in diameter
The outer circumference of 12 closely adheres to the cylindrical surface of the liner inner cylinder 11, and there is no gap between them. By the way, each split plate 37a, 37b
Serves as a lower electrode facing the upper electrode 16 at this contact position.

In the figure, reference numeral 42 indicates a long hole.

Next, the operation of the spot welding apparatus having the above structure will be described.

The inner diameter of the liner cylinder 11 is such that the inner diameter of the inner ring 12 is larger than the inlet diameter or the outlet diameter of the central portion (see FIG. 2). Therefore, it is necessary to increase the outer diameter dimension of the inner ring 12 after inserting the inner ring 12 into the liner cylinder 11. First, the inner ring 12 is held by the inner ring holding means 30 of the inner ring expansion holding means 18. Initially, the inner ring holding means 30 has a spring 39 which keeps the outer diameters of the divided plates 37a and 37b at the minimum diameter.
Insert 12 into the outer circumference. While aligning the liner inner cylinder 11 concentrically with the inner ring 12 from the front of the split plates 37a, 37b, the liner inner cylinder 11 is sent to a position where it hits the stopper 21 for axial positioning.

Next, the fluid cylinder of the plate enlarging means 30
32 is operated to pull the cylindrical wedge 35 inward, and the respective division plates 37a and 37b are moved in the radial direction to enlarge the diameter. At this time, the inner ring 12 that is in contact with the outer circumferences of the split plates 37a and 37b is pushed from the inner side to expand the outer diameter, and the inner peripheral surface of the liner cylinder 11 and the outer peripheral surface of the inner ring 12 are in close contact with each other, and there is a space between them. The gap is zero. Stopper 21 and upper electrode
By maintaining the positional relationship with 16 accurately, the positioning in the axial direction of the liner cylinder can be maintained with high accuracy.

Further, the spot welding position in the circumferential direction is accurately given by the automatic indexing device 25.

The motor 28 is rotated at a position where the inner ring 12 is in contact with the liner cylinder 11, the indexing gear 26 is rotated by a predetermined angle, and the electrode base 29 supporting the liner cylinder 11 is rotated. At this time, the flow of the fluid to the fluid cylinder 22 is stopped in order to release the restraint of the temporary electrode base 29. Liner cylinder 11
After moving by 1 pitch and stopping, fluid pressure is applied again to restrain the movement of the electrode base 29. Thus, the positioning in the circumferential direction can be accurately performed by the highly accurate indexing.

Next, when the spot position is determined,
The upper electrode 16 is lowered and applied to the outer surface of the liner cylinder 10, and current is applied from the lower electrodes (divided plates 37a, 37b) to the upper electrode 16 to perform spot welding.

In order to set the next inner ring 11, the expanded diameters of the divided plates 37a and 37b are returned to their original positions. For this purpose, the fluid pressure of the fluid cylinder 32 is released, and the cylindrical wedge 35
And the constraint between the divided plates 37a and 37b is released.
By releasing this constraint, the split plates 37a, 37
b is moved toward the center by the action of the spring 39, and the diameter of the outer peripheral portion is again minimized. The next inner ring 12 is attached to the inner ring holding means 30, and the work of the above procedure is repeated to join a predetermined number of inner rings 12 to the inner peripheral surface of the liner cylinder 11.

Thus, since the automatic indexing means 25 is provided, positioning of spot welding points, for example, more than 40 points in the circumferential direction can be performed without trouble, and the efficiency can be dramatically improved. Is.

Further, since the inner ring enlarging and holding means 18 is provided, spot welding can be performed with the gap between the liner cylinder 11 and the inner ring 12 kept at zero, resulting in insufficient joint strength due to poor welding. It is possible to eliminate defects.

[0025]

As described above, in the present invention,
Spot welding points arranged in the circumferential direction can be indexed easily and efficiently, and work efficiency can be greatly improved. On the other hand, of the divided inner ring holding means
Each is secured to the plate base by wedge means.
It moves in the direction perpendicular to the shaft center via the id member, and
By the spring corresponding to the divided inner ring holding means
It has an inner ring expansion holding device that is biased in the axial direction.
This allows the inner ring holding means to be easily and perfectly circular.
Can be surely expanded, even in continuous cylinders of different diameters
Can hold the inner ring. Therefore,
Since they can be brought into close contact with each other, welding defects can be reduced, and the joint strength between the liner cylinder and the inner ring can be increased.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a spot welding apparatus according to the present invention.

FIG. 2 is an elevational view showing a state in which the spot welding apparatus according to the present invention is installed in a spot welding machine.

FIG. 3 is an installation state explanatory view showing a part of FIG. 2 in an enlarged manner.

FIG. 4 is a front view of an inner ring holding means according to the present invention,

FIG. 5 is an elevation view showing an example of a conventional spot welding apparatus.

[Explanation of symbols]

11 ... Liner cylinder 30 ... Inner ring holding means 12 ... Inner ring 31 ... Plate expanding means 25 ... Automatic indexing device 32 ... Fluid cylinder 26 ... Indexing gear 35 ... Cylindrical wedge 29 ... Electrode base 37a, 37b ... Dividing plate

Claims (1)

[Claims] 1. A spot in which a pedestal is provided on the front surface of a frame of a spot welding machine while keeping its axis horizontal, and an upper electrode is arranged above the pedestal in a direction intersecting the pedestal axis at a right angle. In the welding device, a holding sleeve provided inside the pedestal so as to be concentric with the pedestal axis center and having an opening facing the lower end of the upper electrode, and a concentric portion with the sleeve inside the holding sleeve. An electrode base having a plate base protruding from the opening, a plate enlarging means including a wedge means provided along the axis of the electrode base, and the plate provided facing the upper electrode. The inner ring holding means also serves as a lower electrode engaged with the wedge means on the front surface of the table, and the inner ring holding means is provided.
Is divided into multiple parts around the axis to form a split member.
Each of the split members is formed by the wedge means.
Through the guide member fixed to the base
By moving the spring and corresponding to each divided member at all times
An inner ring enlarging and holding device which is urged in the axial direction and a rear side of the electrode base are connected to each other, and the electrode base is rotated by a predetermined angle during operation so that the spot welding points are formed on both electrodes. A spot welding device, comprising: an indexing device placed between them.