JP3497108B2 - Manufacturing method of aperture grill - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an aperture grill used as a color selection electrode of a color picture tube.
Concerning the law .

[0002]

2. Description of the Related Art Conventionally, an aperture grill in which a large number of elongated slits are formed in parallel on a thin metal plate has been used as a color selection electrode of a color picture tube. In the process of assembling this aperture grill, the aperture grill is welded to the aperture grill frame that is bent by a certain distance due to pressure, and then the pressure is released so that the grill is stretched with a certain tension. Was there. In this case, since the bent welding line of the aperture grille frame becomes a curve, the running line of the welding head, the electrode angle, and the like are determined by the profile welding mechanism described below.

The structure of a conventional profile welding mechanism will be described with reference to FIG. In FIG. 5, 1 is an H member of the aperture grille frame, 2 is a V member of the aperture grille frame, 4 is a flat aperture grille, 5
Is a welding electrode, 8 is a tracing rod arranged so as to abut on the outer surface of each H member 1, and 4 are 9 tracing plates connected to each other, 10 is a cam follower, and 11 is welding at one end It is a connecting arm having a roller electrode 5 forming a head and a cam follower 10 attached to the other end.

In the profile welding mechanism having the above-described structure, the four profile bars 8 are brought into contact with predetermined positions on the outer surface of each H member 1 to position the profile plate 9, and the profile plate 9 has its outer surface. Weld line is approximated by. When the cam follower 10 travels from one end to the other end along the outer surface of the profile plate 9, the welding line and the welding angle of the roller electrode 5 that moves integrally by the connecting arm 11 become the shape of the aperture grill frame 1. Determined according to As described above, in the conventional profile welding mechanism, the running line of the welding electrode 5 can be easily determined by continuously tracing the cam follower 10 on the side surface of the profile plate 9, and the electrode angle with respect to the welding surface can be controlled. Was possible.

[0005]

In such a conventional profile welding mechanism, the deformed shape when the aperture grill frame 1 is deformed under pressure is approximated by a plurality of straight lines or a curve having a predetermined curvature. In the apparatus of FIG. 5, the traveling line and the electrode angle of the welding electrode 5 are defined by the outer surface shapes of the three following plates 9 described above. Here, if the number of the follower plates 9 is increased or the curves having different types of curves are prepared, the accuracy of the follower can be increased. But,
In the normal welding process, there are restrictions on equipment such as interference with the pressure mechanism of the aperture grille frame and other mechanical parts, and there are only four follower bars 8 and about three follower plates 9. There wasn't. For this reason, the frame deformation shape is not sufficiently approximated, or the roller electrode 5
If the plate width of the H member 1 which is the welding surface of the aperture grill frame is not wide enough with respect to the thickness of, the roller electrode 5 will be removed from the aperture grill frame during welding when attempting to weld by the conventional profile welding mechanism. Dropped out,
Alternatively, there is a risk that the aperture grille frame may be displaced from the center of the welding surface. Even if the roller electrode 5 does not fall off,
If the welding line shifts to the end of the H member 1 and the welding line is applied to the chamfered portion or the like, there is a risk of defective welding between the flat aperture grille 4 and the frame 1.

Further, in the aperture grill frame having low rigidity, the deformed shape of the aperture grill frame, for example, the position of the curvature or the inflection point is largely changed by only slightly changing the pressurizing condition for the aperture grill frame at the time of assembly. To do. Therefore, the same three contour plates 9
Therefore, it becomes impossible to approximate the welding line and determine the traveling line of the roller electrode 5 at the time of welding. Therefore,
Every time the pressurizing condition is changed, it is necessary to change the setup prior to the welding work by the roller electrode 5, such as exchanging the tracing plate 9 having a different length or shape.

Also, when assembling / welding aperture grilles of different sizes with the same machine, the position adjustment of the follower plate 9 and the follower plate 9 are performed in the same manner as described above.
In addition to the above replacement, there has been a problem that it is necessary to change the setup such as changing the contact position of the follower rod 8.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to allow the electrode to travel with high accuracy in accordance with the deformed shape of the aperture grill frame at the time of pressurization and to apply the pressurizing condition. Even if the dimensions of the aperture grille are changed or the dimensions of the aperture grille are changed, it is possible to provide an aperture grill manufacturing apparatus that can accurately perform welding between the aperture grille and the aperture grille frame without requiring any setup change or readjustment of the equipment. is there.

[0009]

According to a first aspect of the present invention, there is provided a method of manufacturing an aperture grill used as a color selection electrode of a color picture tube, which is performed in parallel with an operation of transferring the aperture grill to an aperture grill frame. Measurement process of measuring the shape of the grill welding surface of the aperture grill frame along a plane parallel to the welding line, the welding process of welding the aperture grill to the grill welding surface of the aperture grill frame, and the shape measured in the measurement process And a control step of controlling the welding line and the welding angle of the welding step by using the data to determine the welding line and the welding angle of the welding step prior to the welding.

In the invention described in claim 2, in the measuring step , the roller that rolls while contacting a surface parallel to the welding line of the aperture grill frame, and the grill welding of the aperture grill frame from the roller. Using a measurement aid equipped with a measured part that projects above the surface, while moving the measurement aid along a plane parallel to the welding line of the aperture grill frame, move the measured part from the movement trajectory of the measured part to the grill welding surface. The shape data of is measured.

In the invention described in claim 3, in the measuring step , a displacement gauge provided with an optical signal transmitting / receiving means is used , and the displacement gauge is moved along a plane parallel to a welding line of the aperture grille frame. While, the shape of the welding surface of the grill is measured by the optical signal.

[0012]

DETAILED DESCRIPTION OF THE INVENTION Referring to the accompanying drawings,
An embodiment of the present invention will be described.

Embodiment 1. FIG. 1 is a diagram showing an apparatus for manufacturing an aperture grill to which the present invention is applied. Here, parts corresponding to those described in FIG. 5 are given the same reference numerals. That is, 1 is an H member of the aperture grill frame, 2 is a V member of the aperture grill frame, 4 is a flat aperture grill, and 5 is a roller electrode that constitutes a welding head. In the following description, for convenience, the frame longitudinal direction is x-axis and the width direction is y.
The direction perpendicular to the axes, the x-axis and the y-axis is the z-axis. Further, FIG. 2 is a diagram for explaining a welding operation by the manufacturing apparatus of the present invention.

The apparatus for manufacturing an aperture grill shown in FIGS. 1 and 2 has a structure in which the H of the aperture grill frame is pressed when pressure is applied.
A measuring device 3 for measuring the deformed shape of the member 1, a roller electrode 5, a y-direction drive mechanism 7 for controlling the y-axis direction position thereof, a rotational direction drive mechanism 6 for controlling the angle of shake from the x-axis direction, and the like. ing. These measuring device 3, roller electrode 5,
The y-direction drive mechanism 7 and the rotation-direction drive mechanism 6 are respectively fixed to a pair of inverted L-shaped support columns 12 movable along each H member 1. In the figure, only the welding mechanism and the measuring mechanism are shown in the manufacturing apparatus of the aperture grill, and the frame pressing mechanism, the driving mechanism of the support column 12 in the x-axis direction, and the roller electrode 5 are connected to the flat aperture grill 4 and the aperture grill frame. Illustration of the electrode pressing mechanism for pressing the H member 1 is omitted.

First, referring to FIG. 1, a means for measuring the deformed shape of the aperture grille frame when the frame is pressed will be described. In FIG. 1, each of the pair of measuring devices 3 is composed of an optical position indirect measuring means such as a laser displacement meter. Each measuring device 3 is provided with a laser light emission window 3a and an incident window 3b, receives reflected light of the laser light emitted from the emission window 3a at the incident window 3b, and measures the distance to the reflection surface of the laser light. It is a thing. Each measuring device 3
Move in the direction of the arrow in the figure (negative direction of the x-axis) together with the columns 12. That is, by moving the pair of measuring devices 3 along a predetermined path inside the aperture grill frame and reflecting the laser light of the measuring device 3 on the inner surface of the H frame 1, for example, the aperture grill frame It is possible to obtain data on the shape of the welding surface of the grill. Note that FIG. 3 shows an enlarged cross section of the measuring device 3 of FIG. 1 as seen from the x-axis direction.

In the measuring device 3 thus constructed, the data measured based on the received laser beam is sent to the control unit (not shown), and the welding line and welding angle approximate to the shape of the frame deformed under pressure prior to welding. Will be able to determine.

In FIG. 2, the roller electrode 5 descends along the side surface of the support column 12 to a position where it comes into contact with the flat aperture grill 4. Each of the columns 12 includes, for example, a rotation direction driving mechanism 6 such as a servo motor, and a roller electrode 5.
A y-direction drive mechanism 7 including a servo motor 7a, a ball screw 7b, a linear motion guide 7c, and the like for controlling the y-axis direction position is provided. Each of these drive mechanisms 6 and 7 controls the traveling line and the rotation direction angle of the roller electrode 5 with respect to the support 12 based on the welding line and the welding angle measurement data measured by the measuring device 3. When the column 12 moves in the arrow direction (positive direction of the x-axis), the position and the angle of the roller electrode 5 can be controlled along the welding line determined on the welding surface of the H member 1.

The measurement operation will be described with reference to FIG.
First, the roller electrode 5 is slid on the upper part of the column 12, the measuring device 3 is fixed at a position facing the inner side surface of the aperture grill frame, and the welding surface shape of each H member 1 is simultaneously measured. At this time, the aperture grill frame is pressed by the frame pressing means (not shown). In this state, while moving the measuring device 3 in the arrow direction (negative direction of the x-axis), the inner side surface of each H member 1 is irradiated with laser light from the emission window 3a. Therefore, since the distance in the y-axis direction with respect to the moving reference path of the measuring instrument 3 can be obtained based on the reflected light received by the entrance window 3b, the H member 1
The optimum welding line data according to the shape of the welding surface of is continuously obtained.

Since this measuring operation can be executed in parallel at the same timing as the operation of transferring the flat aperture grill 4 onto the pressure-deformed aperture grill frame, it has little influence on the cycle time of the assembly process. .

Next, the welding process using the welding head will be described. H member 1 of the aperture grille frame
The flat aperture grill 4 is set on the upper side, and the roller electrode 5 is slid to the lower part of the support column 12 to be brought into contact with the welding surface position of the aperture grill frame on the flat aperture grill 4. After that, by moving each of the columns 12 in the positive direction of the x-axis, the roller electrode 5 is caused to travel, and the flat aperture grill 4 is welded to the aperture grill frame. At this time, the position and the rotation angle of the roller electrode 5 in the y-axis direction are controlled in accordance with the moving speed in the x-axis direction based on the previously measured welding line data.

Here, since the welding line data is individually measured for each aperture grille frame, the roller electrode 5 will be the aperture grille regardless of the shape of the aperture grille frame under pressure. There is no risk of falling off from the welded surface of the frame. Also,
Even if the frame pressurizing condition is changed or the size of the aperture grill itself is different, it is not necessary to readjust the equipment or change the setup unlike the conventional device.

Embodiment 2. In the manufacturing apparatus according to the first embodiment, as shown in FIG. 3, unless the measuring device 3 is moved below the grill welding surface of the aperture grille frame, the laser light from the exit window 3a is not transmitted to the H member of the aperture grille frame. However, the reflected light cannot be received. However, it may be difficult to directly reflect the laser light to the H member 1 of the aperture grill frame because it interferes with other mechanisms such as the pressure mechanism of the aperture grill frame when the measuring instrument 3 is moved. It was

Therefore, in the second embodiment, the measurement is indirectly performed using the measurement auxiliary tool as shown in FIG.
This measurement assisting tool rolls the roller 1 while rolling it while another roller 13 is in contact with the inner surface (or the outer surface) of the H member 1 of the aperture grill frame.
3 and the reflecting portion 14 formed so as to project above it are moved simultaneously from the one end of the aperture grill frame to the opposite end at the same time as the above-mentioned measuring device 3, and the moving locus of the reflecting portion 14 by the measuring device 3. Is measured. By using such a measuring aid, even if the measuring device 3 cannot be lowered below the grill welding surface of the aperture grill frame, the welding surface shape of the H member 1 of the aperture grill frame can be indirectly measured. Similar to the case of the first embodiment, the welding line can be determined. In the case of the second embodiment, it is not an expensive optical position indirect measuring means such as a laser displacement meter,
The movement locus of the measuring aid can be directly measured by using the contact type measuring means.

[0024]

Since the present invention is constructed as described above, it has the following effects.

Manufacture of aperture grille according to claim 1
The method includes the step of measuring the shape of the grille weld surface of the aperture grill frame operation for transferring the aperture grille aperture grill frame concurrently with along a plane parallel to the welding line, the aperture grill frame aperture grill Welding process to weld to the grill welding surface of
The welding line and the welding angle of the welding process and determined prior to welding using a measured shape data measuring step, and a control step <br/> for controlling the welding line and the welding angle of the welding process Therefore, the shape of the grill welding surface can be measured individually for each aperture grill frame, and the welding head can be accurately traced regardless of the modified shape of the aperture grill frame to weld the flat aperture grill and the aperture grill frame. It can be performed. In addition, no special equipment readjustment or setup change is required even after changing the pressurizing condition or when the aperture grill size is different.

Manufacture of aperture grille according to claim 3
The method is a displacement meter in which the measuring step includes means for transmitting and receiving optical signals.
The use, the displacement gauge while moving along a plane parallel to the welding line of the aperture grill frame, it is possible to measure the shape of the grille weld surface by light signals.

Manufacturing of the aperture grille according to claim 2
According to the method , the measuring step includes a roller that rolls while contacting a surface parallel to the welding line of the aperture grill frame, and a reflecting portion that projects from the roller above the grill welding surface of the aperture grill frame. use the auxiliary tool
There, while the measurement aid is moved along the welding line of the aperture grill frame with the displacement gauge, it is possible to measure the shape of the grille weld surface by the light signal from the reflection of the measuring aid, when moving the measuring means Even when it interferes with another mechanism such as the aperture grill frame pressurizing mechanism, the shape of the aperture grill frame can be indirectly and accurately measured.

[Brief description of drawings]

FIG. 1 is a diagram showing a shape measuring operation of an aperture grill frame by the aperture grill manufacturing apparatus of the present invention.

FIG. 2 is a view showing a welding operation by the aperture grill manufacturing apparatus of the present invention.

FIG. 3 is an enlarged view showing a shape measuring unit of an aperture grill frame.

FIG. 4 is an enlarged view of a measuring unit in the case of indirectly measuring the shape of the aperture grille frame.

FIG. 5 is a diagram showing a welding mechanism in a conventional apparatus for manufacturing an aperture grill.

[Explanation of symbols]

1 H member of aperture grille frame, 2 V member of aperture grille frame, 3 Measuring instrument,
4 flat aperture grille, 5 roller electrode,
6 rotation direction position control mechanism, 7 y direction position control mechanism, 8 tracing rod, 9 tracing plate, 10
Cam follower, 11 arms, 12 columns, 13
Roller, 14 reflective surface.

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Claims (3)

(57) [Claims] 1. A method of manufacturing an aperture grill used as a color selection electrode of a color picture tube, wherein an aperture grill frame is provided along a plane parallel to a welding line at the same time as the operation of transferring the aperture grill to the aperture grill frame. Measurement step of measuring the shape of the grill welding surface of the, the welding step of welding the aperture grill to the grill welding surface of the aperture grill frame, the welding using the shape data measured in the measurement step
A method of manufacturing an aperture grill, comprising a control step of determining a welding line and a welding angle of the step prior to welding and controlling the welding line and the welding angle of the welding step . 2. The measuring step comprises: a roller that rolls while contacting a surface parallel to a welding line of the aperture grill frame; and a portion to be measured that protrudes from the roller above a grill welding surface of the aperture grill frame. Using a measurement auxiliary tool including and, while moving the measurement auxiliary tool along a plane parallel to the welding line of the aperture grill frame, the shape data of the grill welding surface is measured from the movement locus of the measured portion. The method for manufacturing an aperture grill according to claim 1, wherein: 3. In the measuring step , a displacement meter having an optical signal transmitting / receiving unit is used , and the grill is moved by the optical signal while moving the displacement meter along a plane parallel to a welding line of the aperture grille frame. The method for manufacturing an aperture grill according to claim 1, wherein the shape of the welding surface is measured.