JPH029911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method of welding a frame and a mask used in a mask portion of a panel of a color cathode ray tube.

(Prior Art) Generally, the mask portion of the panel of a color cathode ray tube has the following structure. In FIG. 1, 11 is a frame, and a plurality of clips 12 are welded and fixed to the outer peripheral surface of this frame 11.
This is combined with the mask 13 shown in FIG. 2 and fixed by welding as shown in FIG. 3. As shown in FIGS. 4a and 4b, these are housed in a panel 15, and the mask 13 is inserted into the panel 15 by fitting the panel pin 16 planted in the panel 15 with the clip 12. Positioned at specified intervals.

In this way, the manufacturing process of color cathode ray tubes involves the press-formed frame 11 and the clip 1.
2, there is a step of welding the frame 11 and the mask 13 so that the mask 13 can be assembled on the inner surface of the panel 15 with a prescribed interval maintained therebetween. In a color cathode ray tube, the combination of the panel 15 and mask 13 is one of the factors that determines the quality of the color cathode ray tube, and a highly accurate combination is required. Therefore, if parts are deformed or excessive force is applied during each of the above welding operations, increased deformation and residual distortion will occur during the heat treatment in the post-process, which can seriously affect the characteristics of color cathode ray tubes. Therefore, sufficient measures must be taken to prevent the above deformation from occurring.

When welding the frame 11 and the clip 12, as shown in FIG. 5, the four corners of the frame 11 are positioned by the frame receivers 19, and the clips 12
0 and place it at a specified position with respect to the frame 11, and also fit the positioning pin 21 into this clip 12 to attach the panel 15 shown in FIG.
After setting it to the same position and the same deformation state as when it is attached to the holder, resistance welding is performed at several points using a pair of welding electrodes 24 and 25.

In addition, when welding the frame 11 and the mask 13, as shown in FIG. 6, the frame 11 with the clip 12 attached is clipped to the reference pin 27 which is in the same positional relationship as the panel pin 16 shown in FIG. 12 to fix it by engaging with it, and place the mask 13 on the mask holder 28 and cover it,
These joints are resistance welded using a pair of welding electrodes 24 and 25.

When performing the above-mentioned welding, various methods have been used in the past, one example of which will be explained with reference to FIG. 7. The pair of welding electrodes 24 and 25 are connected to objects to be welded, for example, the frame 11 and the mask 1.
3, and are supported so as to be movable along the axial direction thereof. That is, one welding electrode 24 is attached to a movable base 32 together with an operating cylinder 30 via a support base 31, and this movable base 32 is movable on a base 34 along the axial direction of the welding electrode 24 by a slide mechanism 33. It is set in. The other welding electrode 25 is mounted on a movable base 36 via a support base 35, and this movable base 36 is movable on the movable base 32 via a slide mechanism 37 along the axial direction of the welding electrode 25. It is set in. Further, the moving table 36 is connected to the operating rod 3 of the operating cylinder 30.
0a, and the base 34
A stopper 39 for the movable table 36 is provided.

During welding, the operating rod 30a of the operating cylinder 30 is retracted, and the pair of welding electrodes 2
4 and 25 to each other, and the objects to be welded 11 and 13
bring it into contact with. Also, after welding, the operating cylinder 3
The operating rod 30a of No. 0 is moved forward to move the welding electrode 25 on one side first, and when stopped by the stopper 39, the welding electrode 24 on the opposite side is moved in the separating direction.

In the above conventional method, each slide mechanism 33, 3
If the wear resistance of 7 is not extremely small, welding electrode 2
Either one of 4 and 25 comes into contact with workpieces 11 and 13 to be welded earlier than the other. In this case, the workpiece 1
As long as 1 and 13 have a sufficiently high bending strength, there will be no problem, and they can be welded by being held between them at a position parallel to the objects 11 and 13 to be welded. However, the objects to be welded, such as the frame 11 with a thickness of about 0.1 to 0.2 and the mask 13 with a thickness of about 1 mm, are thin, and the pressure required for welding them is 7 to 8.
Kg, so a pair of welding electrodes 24,
25 are not in even contact with each other, the objects to be welded 11 and 13
For example, deformation as shown in FIG. 8 occurs.

There is also a conventional method shown in FIGS. 9a and 9b.
A tapered drive cam 40 is attached to the tip of the operation rod 30a of the operation cylinder 30, and the drive cam 40 is rotatably supported by a roller portion 41a at the upper end of a pair of levers 41 and 42. ，
42a, and the lowering of the drive cam 40 with the operation of the operation cylinder 30 causes the roller portions 41a, 4
2a in the opening direction, and the pair of levers 41, 42
Welding electrodes 24, 25 provided at the lower ends of the welding electrodes 24, 25 are operated to pinch the objects 11, 13 to be welded.

Although this method is not as effective as the one in FIG.
1 and 13, and it is quite possible that the above-mentioned deformation may occur. Further, in this case, since the welding electrodes 24, 25 move in an arc shape, the objects 11, 13 to be welded may be moved in the direction of their contact surfaces during welding. If welding is performed in a state deviated from the predetermined position in this way, the prescribed positional relationship cannot be achieved when the panel 15 shown in FIG. 4 is assembled.

Conventionally, as shown in Japanese Patent Publication No. 44-2341, a pair of elastic plates are fixed to a movable holder so that the plate surfaces are perpendicular to the pressing direction and parallel to each other. A pressure electrode is attached to the connecting part of the free end of the elastic plate, the pressure electrode is brought into contact with the workpiece by moving the movable holder, and the movable holder is moved until a slight deflection occurs in the pair of elastic plates. A method is known in which the pressure electrode is moved in the pressure direction and positioned, and the pressure electrode is pressed against the workpiece by the elasticity of an elastic plate to achieve a predetermined welding pressure.

However, according to this method, the part to be welded is fixed, and the pressure of the pressurizing electrode is only gradually increased, and the positioning of the counter electrode and the part to be welded is not taken into consideration. Even if the welding object is pressed against the counter electrode, the pressure applied to the welded object is only as strong as the elasticity of the elastic plate.
Even if it is used for pressure welding of micro parts that can be welded with microelectrodes, it must be 30 to 60 cm in size and 1 to 2 kg in weight, such as the color cathode ray tube frame and mask mentioned above. When welding objects with a welding force of 7 to 8 kg using a pair of welding electrodes, it is necessary to use a fixed type for the welding object and a movable type for the electrodes. Pressure becomes a problem, and the problem as shown in FIG. 8 is likely to occur.

(Problems to be Solved by the Invention) As mentioned above, in the conventional method of welding the frame and mask of a color cathode ray tube, high-precision welding is required without causing deformation of the object to be welded. In some cases, it was not completely satisfactory.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for welding a frame and a mask of a color cathode ray tube by using a pair of welding electrodes without causing deformation or displacement of the frame and mask assembly of a color cathode ray tube. It is in.

[Structure of the invention]

(Means for Solving the Problems) The color cathode ray tube frame/mask welding method of the present invention involves pinching the object to be welded with a predetermined welding pressure using a pair of welding electrodes, and applying current between the pair of welding electrodes. When performing welding, one of the welding electrodes is brought into moving contact with the workpiece at a pressure lower than the welding pressure, the movement of one of the welding electrodes is stopped at that position, and one of the welding electrodes is stopped at this stop position. With the electrodes fixed, one welding electrode is positioned along the frame and mask assembly, and then the other welding electrode is brought into contact with the workpiece under a predetermined welding pressure, and the pair of welding electrodes is separated. Welding is performed between the two.

(Function) In the present invention, one of the welding electrodes is moved into contact with the frame and mask assembly with a weak pressure that does not cause deformation of the frame and mask assembly, and is stopped at that position. After positioning the frame and mask assembly with respect to the frame and mask assembly by fixing one welding electrode, while maintaining the welding position with this fixed one welding electrode,
Welding is performed by applying a predetermined welding pressure using the other welding electrode.

(Example) Hereinafter, an example of the present invention will be described in Figures 10 to 1.
This will be explained with reference to FIG.

In FIG. 10, a pair of welding electrodes 24, 25
are arranged in a butt-like manner. One of the welding electrodes 24 is held at the tip of an electrode holder 60, as shown in FIGS. The electrode holder 60 is supported so as to be able to move forward and backward along the cylindrical portion 62, and is constantly subjected to an acting force to the right in the figure by a spring 65 provided between the tip of the cylindrical portion 62 and the flange portion 63 at the tip of the electrode holder 60. Further, the support stand 61 is supported on a base 72 via a slide mechanism 70 so as to be movable along the axial direction of the one welding electrode 24, and is connected to an operating rod 71a of an operating cylinder 71. , along with this movement, moves forward and backward.

Reference numeral 66 denotes a fixing mechanism for one of the welding electrodes, which has a locking lever 67 fitted in the lower part of the cylindrical portion 62 in the orthogonal direction. It is rotatably supported by a shaft 67a, and the other end is connected to an operating rod 68a of an operating cylinder 68 provided on the support base 61 by a support shaft 67b. Then, as the operating cylinder 68 moves, the connecting end is pushed up, and as shown in FIGS. 11 and 12,
It is fixed in contact with the outer surface of the electrode holder 60 to prevent its movement in the axial direction.

Further, the other welding electrode 25 is mounted on a movable table 75 that is movable along its axial direction, and an operation cylinder 76 for applying pressure is attached to this movable table 75.
The other welding electrode 25 is configured to move forward and backward along its axial direction as the operation cylinder 76 moves.

Then, the frame 11 and the mask 13 are placed between the pair of welding electrodes 24 and 25, and the support base 61 is moved by the operation of the operation cylinder 71, and one welding electrode 24 is placed between the frame 11 and the mask 13 (hereinafter referred to as (denoted as objects to be welded 11 and 13). touch one side of the At this time, one of the welding electrodes 24 is operated with a pressure lower than the welding pressure, that is, with a weak pressure that does not cause deformation of the objects 11 and 13 to be welded, due to the action of the spring 65 that biases the electrode holder 60. It is pressed against one side of the objects 11 and 13 to be welded, and at that position, the operation cylinder 71 is stopped and the movement of one welding electrode 24 is stopped.

At the same time, the operating cylinder 6 of the fixing mechanism 66
8 to rotate the locking lever 67 upward and press the locking lever 67 against the outer surface of the electrode holder 60 to fix the electrode holder 60, that is,
One of the welding electrodes 24 is fixed at the stop position, and the one of the welding electrodes 24 is positioned along the objects 11 and 13 to be welded.

Thereafter, while maintaining the welding position with one fixed welding electrode 24, the operation cylinder 76 is operated to move the support base 75, and the other welding electrode 25 is placed on the other side of the objects 11, 13 to be welded. The objects to be welded 11 and 13 are pressed together by the pair of welding electrodes 24 and 25 at a predetermined welding pressure, and electricity is applied between the pair of welding electrodes 24 and 25 to perform welding.

Then, after welding, one of the welding electrodes 24 is operated by operating the operating cylinder 71, and the operating cylinder 7
6 moves the other welding electrode 25 in the direction of separation, and the operation cylinder 68 releases the electrode holder 60 to prepare for the next welding operation.

In this way, first, one of the welding electrodes 24 is brought into contact with the objects to be welded 11, 13 with a weak pressure, and after positioning and fixing one of the welding electrodes 24 following the objects to be welded 11, 13, Since a predetermined welding pressure is applied by the welding electrode 25, the objects to be welded 11, 1
Good welding can be performed without deforming the parts 3 or shifting their positional relationships. When welding a relatively large item such as an annular shape with at least one side and a welding pressure of 7 to 8 kg, welding is performed uniformly at multiple locations. be able to.

In particular, in this embodiment, one of the welding electrodes 24 is initially pressed against the objects 11 and 13 to be welded and positioned by following the shape of the objects, but since the pressure can be set by the force of the spring 65, this is not an extreme case. In that case, the pressure can be as low as the stylus pressure of a dial gauge, or at most a few hundred grams. Therefore, even if the object to be welded is thin, it will not be deformed, and positional accuracy can be easily achieved.
Furthermore, there is no need to worry about contamination, and it is easy to deal with electrode wear.

〔Effect of the invention〕

According to the present invention, when welding the frame and mask assembly of a color cathode ray tube by applying current under pressure using a pair of welding electrodes, first, one of the welding electrodes is brought into contact with the object to be welded with a weak pressure; After positioning and fixing one welding electrode along the workpiece,
Since a predetermined welding pressure is applied using the other welding electrode, the thin-walled frame and mask assembly is not deformed or their positional relationship is shifted.
Good welding can be performed.

[Brief explanation of drawings]

1 and 2 are perspective views showing the frame and mask of the cathode ray tube according to the present invention, FIG. 3 is a sectional view showing the assembled state of the frame and mask of FIGS. 1 and 2, and FIGS. 4 a and b. are a perspective view and a sectional view showing the frame and mask shown in Fig. 3 assembled into a panel, Fig. 5 is a partial perspective view showing a general method of welding the frame and clip, and Fig. 6 is
The figure is a partial sectional view showing a general welding method for frames and masks, Figure 7 is a perspective view showing a conventional welding method, and Figure 8 is a section showing deformation of the welded object caused by the conventional method. A sectional view, FIGS. 9a and 9b are a front view and a side view showing another conventional welding method, and FIGS.
The figure is a perspective view showing a welding device for achieving one embodiment of the welding method according to the present invention, and FIG.
FIG. 12 is a partial perspective view showing the main parts in the figure, and FIG. 12 is a partial sectional view corresponding to FIG. 11. 11, 12, 13... object to be welded, 24, 25... welding electrode.

Claims (1)

[Claims] 1 A pair of welding electrodes compresses the frame and mask of a color cathode ray tube at a predetermined welding pressure, and when welding by passing electricity between the pair of welding electrodes, one of the welding electrodes is held at a pressure below the welding pressure. Then move the welding electrode into contact with the frame and mask assembly, and fix one welding electrode at that position to position the one welding electrode in line with the frame and mask assembly, and then,
A frame/mask welding method for a color cathode ray tube, characterized in that welding is performed between a pair of welding electrodes by bringing the other welding electrode into contact with the frame/mask assembly under a predetermined pressure.