JPH0887960A - Manufacture of electrode for electron gun - Google Patents

Abstract

PURPOSE: To improve productivity of a field correcting metal plate while forming a shear cut section smooth in high dimensional accuracy relating to a hole part of the field correcting metal plate used in a focusing electrode and a final accelerating electrode of an electron gun. CONSTITUTION: First, a punch 10 of mirror finishing the side surface and dies 7 are used, to apply shearing work of the first time to a workpiece metal plate 8. A metal bank 14 is generated in a hole 8a formed by this shearing work in the first time. Then, in order to obtain smoothness by removing this metal bank 14, shearing work of the second time is applied. In this shearing work in the second time, a punch 10 of satin finishing the side surface is used. First, the workpiece metal plate 8, applied with shearing work in the first time, is placed in the dies 7. Next by using the punch 10, shearing work is applied again relating to the hole 8a of the workpiece metal plate 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a color picture tube (CR).
The present invention relates to a method of manufacturing an electrode for an electron gun in T), and particularly to a method of manufacturing a metal plate for electric field correction of a focusing electrode and a final accelerating electrode forming a main lens.

[0002]

2. Description of the Related Art The operating principle of an electron gun will be briefly described. FIG. 9 shows a sectional view of the in-line type electron gun. Figure 9
As shown in FIG. 3, the electron beam 21 emitted from the cathode (cathode) 22 passes through the control electrode 23 and the acceleration electrode 24 and is focused by the prefocus lens 25 formed by the acceleration electrode 24 and the focusing electrode 1. . Thereafter, the electron beam 21 passes through the focusing electrode 1 and
And the main lens 26 formed by the final acceleration electrode 2
To form an image on the fluorescent screen (not shown).

FIG. 6 shows the electrode structure of the main lens formed by the focusing electrode and the final acceleration electrode, and FIG. 7 shows the electrode structure of the final acceleration electrode. As shown in FIG. 6, the focusing electrode 1 and the final accelerating electrode 2 are provided with electric field correcting metal plates 5 and 6 inside the cylindrical bodies 3 and 4, respectively. Further, as shown in FIGS. 6 and 7, holes 6a, 6b, 6c are formed in the electric field correction metal plate 6 of the final acceleration electrode 2 so as to be arranged inline in the horizontal direction. Also, the focusing electrode 1
The electric field correction metal plate 5 has the same structure as the electric field correction metal plate 6 of the final acceleration electrode 2. That is, as shown in FIG. 6, holes 5a, 5b, and 5c are formed in the electric field correction metal plate 5 of the focusing electrode 1 so as to be arranged inline in the horizontal direction.

The characteristics of the main lens 26 are an important part of the electron gun. Holes 5a and 5a in the electric field correction metal plates 5 and 6 are provided as a part that determines the characteristics of the main lens 26.
b, 5c, 6a, 6b, 6c. Since this portion has a very high sensitivity to the characteristics of the main lens 26, a smooth and highly accurate cut surface is required for this portion. Therefore, conventionally, the holes are formed by stacking at least two punches. That is, first, the metal plate 8 to be processed (metal plate for electric field correction) placed on the die 7 is subjected to the first shear punching process by using the punch 9 whose side surface is mirror-finished to form the hole 8a (see FIG. 8 (a)). By the way, in the hole 8a formed by the first shear punching, as shown in FIG.
As shown in (a), a meat pool 14 is formed. Therefore,
As shown in FIGS. 8B and 8C, the same punch 9 is used to perform shear punching again on the hole 8a of the metal plate 8 to be processed.

[0005]

However, in the above-described processing method, since the punch 9 whose side surface is mirror-finished is used, when the first and second shear punching operations are continuously performed, The supply of the lubricating oil to the sheared surface (the inner peripheral surface of the hole 8a) is suddenly stopped, and the friction between the punch 9 and the inner peripheral surface of the hole 8a of the metal plate 8 to be processed increases. Therefore, if there are about 3000 sheets, the metal plate (metal plate for electric field correction) 8 to be processed can be well punched, but if the number exceeds this number, the holes 8a of the metal plate 8 to be processed will be processed. Deformation such as protrusions will occur due to seizure on the inner peripheral surface of the. Then, the deformation gradually increases, and the diameter of the hole 8a is once smaller than that at the beginning, but finally the punch 9
As a result, the seizure portion is peeled off, so that the diameter of the hole 8a becomes larger than that at the beginning. As a result, the dimensional accuracy of the hole 8a deteriorates, and stable electron gun spot characteristics cannot be obtained. Further, as described above, the punch 9 and the metal plate 8 to be processed are seized, so that the same punch cannot be used for a long time. As a result, since it is necessary to frequently replace the punch, the productivity of the electric field compensating metal plate is reduced.

In order to solve the above-mentioned problems in the prior art, the present invention forms a smooth and highly dimensional-accurate shear cut in the hole portion of the electric field correction metal plate used for the focusing electrode and the final accelerating electrode of the electron gun. It is an object of the present invention to provide a method of manufacturing an electrode for an electron gun, which is capable of improving the productivity of an electric field correction metal plate.

[0007]

In order to achieve the above object, the structure of the first method for manufacturing an electrode for an electron gun according to the present invention is such that after a hole is formed in a metal plate to be processed by shear punching, A method of manufacturing an electrode for an electron gun, which performs shear punching again on a hole, wherein a punch with a mirror-finished side surface is used in the first shear punching, and the punch surface between the shear surface of the hole is used in the shear punching again. It is characterized by using a punch having a structure which is subjected to a surface treatment so as to generate a slight space portion in the punch.

Further, in the first structure of the method of the present invention, it is preferable to use a punch having a satin finished side surface for the second shear punching. Further, in the first configuration of the method of the present invention, it is preferable to use a punch having a hairline-finished side surface for the second shear punching.

The structure of the second method of manufacturing an electrode for an electron gun according to the present invention is for an electron gun in which a hole is formed in a metal plate to be processed by shear punching and then the hole is sheared again. In the method of manufacturing an electrode, a punch with a mirror-finished side surface is used in the first shear punching process, the lower side surface is mirror-finished in the second shear punching process, and the side surface upper part between the shear surface of the hole and It is characterized by using a punch having a structure which is subjected to a surface treatment so as to produce a slight space portion.

In the second construction of the method of the present invention, it is preferable to use a punch in which the lower portion of the side surface is mirror-finished and the upper portion of the side surface is satin-finished for the second shear punching.

Further, in the second construction of the method of the present invention, it is preferable to use a punch in which the lower portion of the side surface is mirror-finished and the upper portion of the side surface is hairline-finished in the shear punching process again.

[0012]

According to the first aspect of the method of the present invention, a punch having a mirror-finished side surface is used in the first shear punching, and a small space is formed between the hole and the shearing surface in the second shear punching. By using a punch with a structure that has been subjected to a surface treatment that causes a portion, in the shear punching process again, a lubricating oil is provided between the inner circumferential surface of the hole formed by the first shear punching process and the punch. Can be supplied smoothly. As a result, friction between the punch and the inner peripheral surface of the hole of the metal plate to be processed can be reduced, so that seizure between the punch and the metal plate to be processed can be avoided. As a result, the change over time in the hole size on the sheared surface is reduced, and a smooth and highly accurate shear cut can be obtained, so that stable electron gun spot characteristics can be obtained. Further, as described above, seizure between the punch and the metal plate to be processed can be avoided, so that the same punch can be used for a long time. As a result, since it is not necessary to frequently replace the punch, the productivity of the electric field correcting metal plate can be improved.

Further, in the first structure of the method of the present invention, according to a preferable structure in which the punch having the satin finished side surface is used for the shear punching again, a slight gap is formed between the shear surface of the hole and the punch. Since the space portion is generated, the lubricating oil can be smoothly supplied between the punch and the inner peripheral surface of the hole of the metal plate to be processed.

Further, in the first structure of the method of the present invention, according to a preferred structure, a punch having a hairline-finished side surface is used for the shear punching again.
Since a slight space is formed between the punch and the shear surface of the hole of the metal plate to be processed, the lubricating oil can be smoothly supplied between the punch and the inner peripheral surface of the hole of the metal plate to be processed.

According to the second aspect of the method of the present invention, a punch whose side surface is mirror-finished is used in the first shear punching process, and a lower side surface is mirror-finished in the second shear punching process, and a side surface upper portion is used. By using a punch with a structure that has a surface treatment that creates a slight space between the hole and the sheared surface of the hole, the hole is overlapped by the mirror-finished part of the lower side surface in the shear punching process again. Can be sheared. In addition, a slight space is created between the shear surface of the hole and the punch in the satin-finished part of the upper side surface, so that lubricating oil can be smoothly applied between the punch and the inner peripheral surface of the hole of the metal plate to be processed. Can be supplied. As a result, friction between the punch and the inner peripheral surface of the hole of the metal plate to be processed can be reduced, so that seizure between the punch and the metal plate to be processed can be avoided. As a result, there is less change over time in the size of the holes in the sheared surface. Therefore, it is possible to obtain a shear cut surface which is smoother and more accurate than in the case of the first configuration of the method of the present invention, and thus it is possible to obtain more stable electron gun spot characteristics. Further, as described above, seizure between the punch and the inner peripheral surface of the hole of the metal plate to be processed can be avoided, so that the same punch can be used for a long time. As a result, since it is not necessary to frequently replace the punch, the productivity of the electric field correcting metal plate can be improved.

Further, in the second structure of the method of the present invention, according to a preferred structure in which the punch having the lower side surface and the upper side surface in a satin finish is used for the shear punching again, the lower surface of the side surface is mirror-finished. The finished part allows the holes to be overlapped and sheared. In addition, since a slight space part is created between the punch surface and the shearing surface of the hole in the satin finished part on the upper side,
Lubricating oil can be smoothly supplied between the punch and the inner peripheral surface of the hole of the metal plate to be processed.

Further, in the second structure of the method of the present invention, according to a preferable structure in which the punch having the lower side surface and the upper side surface hairline-finished is used for the shear punching again, the mirror surface of the lower side surface is used. The finished part allows the holes to be overlapped and sheared. In addition, since a slight space is created between the shear surface of the hole and the punch in the hairline-finished part on the upper side surface, lubricating oil is smoothly supplied between the punch and the inner peripheral surface of the hole of the metal plate to be processed. can do.

[0018]

EXAMPLES The present invention will be described in more detail below with reference to examples. <First Embodiment> FIG. 1 is a process diagram of a first shearing process in a first embodiment of a method for manufacturing an electrode for an electron gun according to the present invention, and FIG. 2 is a method for manufacturing an electrode for an electron gun according to the present invention. First of
FIG. 7 is a second shearing process step diagram in the example of FIG.

First, as shown in FIG. 1A, a metal plate 8 (metal plate for electric field correction) made of stainless steel or the like is placed on the die 7. Then, as shown in FIGS. 1B and 1C, the metal plate 8 to be processed is subjected to shear punching using a punch 9 having a mirror-finished side surface. As a result, holes 8a are formed in the metal plate 8 to be processed (FIG. 1 (c)). By the way, in the hole 8a formed by the first shear punching, as shown in FIG. Therefore, in order to remove the meat pool 14 and obtain smoothness, a second shear punching process is performed.

As shown in FIG. 2, in the second shear punching process, a punch 10 having a satin finished side surface is used. First, as shown in FIG. 2A, the metal plate 8 to be processed, which has been subjected to the first shear punching, is placed on the die 7. Next, as shown in FIGS. 2B and 2C, the punch 10 is used to perform the shear punching process again on the hole 8a of the metal plate 8 to be processed. In this way, in the second shear punching, the punch 10 whose side surface has a satin finish is used.
Is used, a slight space is created between the shear surface of the hole 8a and the punch 10, so that the lubricating oil can be smoothly supplied between the punch 10 and the inner surface of the hole 8a of the metal plate 8 to be processed. You can As a result, friction between the punch 10 and the inner peripheral surface of the hole 8a of the metal plate 8 to be processed can be reduced, so that seizure between the punch 10 and the metal plate 8 to be processed can be avoided. As a result, the hole 8a in the sheared surface
Since the change over time with respect to the dimension is reduced and a smooth and highly accurate shear cut can be obtained, stable electron gun spot characteristics can be obtained. Further, as described above, seizure between the punch 10 and the metal plate 8 to be processed can be avoided, so that the same punch can be used for a long time. As a result, since it is not necessary to frequently replace the punch, the productivity of the electric field correcting metal plate can be improved.

In the present embodiment, the punch 10 having a satin finished side surface is used when the second shear punching is performed. However, the punch 10 is not necessarily limited to the punch having this structure, and the hole 8a may be formed. It suffices that the surface treatment is performed so that a slight space is formed between the punch 8 and the shear surface and the lubricating oil can be smoothly supplied between the inner peripheral surface of the hole 8a and the punch. For example, as shown in FIG.
Even if a punch 11 having a hairline-finished side surface is used, a similar space can be obtained because a slight space portion is formed between the punch 11 and the shearing surface of the hole 8a of the metal plate 8 to be processed.

<Second Embodiment> FIG. 4 is a second shearing process diagram in the second embodiment of the method for manufacturing an electrode for an electron gun according to the present invention.

First, similarly to the first embodiment, a punch 9 having a mirror-finished side surface is used to perform a first shear punching process to form a hole 8a in the metal plate 8 to be processed (see FIG. 1). . Next, as shown in FIG. 4A, the metal plate 8 to be processed, which has been subjected to the first shear punching process, is cut into a die 7
Place on. Next, as shown in FIGS. 4B and 4C, a punch 12 having a mirror-finished lower side surface and a satin-finished upper side surface is used to perform shearing again on the hole 8a of the metal plate 8 to be processed. As described above, in the second shear punching, by using the punch 12 in which the lower portion of the side surface is mirror-finished and the upper portion of the side surface is satin finished, the hole 8a can be overlapped and sheared by the mirror-finished portion of the lower side surface. In addition, since a slight space portion is formed between the punch 12 and the shearing surface of the hole 8a in the satin-finished portion of the upper side surface, between the punch 12 and the inner peripheral surface of the hole 8a of the metal plate 8 to be processed. Lubricating oil can be supplied smoothly. This allows the punch 12 and the metal plate 8 to be processed.
Since friction with the inner peripheral surface of the hole 8a can be reduced, seizure between the punch 12 and the metal plate 8 to be processed can be avoided. As a result, the hole 8a in the sheared surface
The change with time in terms of the dimension of is reduced. Therefore, a smoother and more accurate shear cut can be obtained than in the case of the first embodiment, so that a more stable electron gun spot characteristic can be obtained. Further, as described above, seizure between the punch 12 and the metal plate 8 to be processed can be avoided, so that the same punch can be used for a long time. As a result, since it is not necessary to frequently replace the punch, the productivity of the electric field correcting metal plate can be improved.

In the present embodiment, when the second shear punching is performed, the punch 12 having the lower side surface mirror-finished and the upper side surface satin finish is used. However, the punch 12 is not limited to this structure. However, as the structure of the upper side surface of the punch, surface processing is performed so as to create a slight space between the punch and the shear surface of the hole 8a, and the structure is provided between the inner peripheral surface of the hole 8a and the punch. Any lubricant can be supplied as long as it can be supplied smoothly. For example, as shown in FIG. 5, even if the punch 13 having the lower side surface mirror-finished and the upper side surface hairline-finished is used, a slight space between the shearing surface of the hole 8a and the punch 13 in the hairline-finished portion. Therefore, the same effect can be obtained.

[0025]

As described above, according to the first construction of the method for manufacturing an electrode for an electron gun according to the present invention, a punch having a mirror-finished side surface is used in the first shear punching process, and the shearing is performed again. In punching, by using a punch with a structure that has been subjected to a surface treatment that creates a slight space between the shearing surface of the hole and the shearing surface of the hole. The lubricating oil can be smoothly supplied between the inner peripheral surface of the formed hole and the punch. As a result, friction between the punch and the inner peripheral surface of the hole of the metal plate to be processed can be reduced, so that seizure between the punch and the metal plate to be processed can be avoided. As a result, the change over time in the hole size on the sheared surface is reduced, and a smooth and highly accurate shear cut can be obtained, so that stable electron gun spot characteristics can be obtained. Further, as described above, seizure between the punch and the metal plate to be processed can be avoided, so that the same punch can be used for a long time. As a result, since it is not necessary to frequently replace the punch, the productivity of the electric field correcting metal plate can be improved.

Further, according to the second structure of the method for manufacturing an electrode for an electron gun according to the present invention, a punch having a mirror-finished side surface is used in the first shear punching process, and a lower side surface is used in the shear punching process again. Mirror finish,
By using a punch with a structure that has been subjected to surface processing so that a slight space is created between the upper surface of the side surface and the shear surface of the hole, the hole is made by the mirror-finished part of the lower surface of the side surface in the second shear punching process. Can be stacked and sheared. In addition, a slight space is created between the shear surface of the hole and the punch in the satin-finished part of the upper side surface, so that lubricating oil can be smoothly applied between the punch and the inner peripheral surface of the hole of the metal plate to be processed. Can be supplied.
As a result, friction between the punch and the inner peripheral surface of the hole of the metal plate to be processed can be reduced, so that seizure between the punch and the metal plate to be processed can be avoided. As a result, there is less change over time in the size of the holes in the sheared surface. Therefore, it is possible to obtain a shear cut surface which is smoother and more accurate than in the case of the first configuration of the method of the present invention, and thus it is possible to obtain more stable electron gun spot characteristics. Further, as described above, it is possible to avoid seizure between the punch and the inner peripheral surface of the hole of the metal plate to be processed,
The same punch can be used for a long time.
As a result, it is not necessary to change punches frequently,
The productivity of the electric field correction metal plate can be improved.

[Brief description of drawings]

FIG. 1 is a process drawing showing a first shearing process in the first embodiment of the present invention.

FIG. 2 is a process drawing showing a second shearing process in the first embodiment of the present invention.

FIG. 3 is a process drawing showing another example of the second shearing process in the first example of the present invention.

FIG. 4 is a process drawing showing a second shearing process in the second embodiment of the present invention.

FIG. 5 is a process drawing showing another example of the second shearing process in the second example of the present invention.

FIG. 6 is an electrode configuration diagram of a main lens of an electron gun for a color picture tube.

FIG. 7 is an electrode structure diagram of a final acceleration electrode of an electron gun for a color picture tube.

FIG. 8 is a process diagram showing a second shearing process in the prior art.

FIG. 9 is a sectional view of an in-line type electron gun.

[Explanation of symbols]

1 Focusing Electrode 2 Final Accelerating Electrode 3 Cylindrical Body of Focusing Electrode 4 Cylindrical Body of Final Accelerating Electrode 5 Metal Plate for Correcting Electric Field of Focusing Electrodes 5a, 5b, 5c Beam Passing Hole of Metal Plate for Correcting Electric Field of Focusing Electrode 6 Final Metal plate 6a, 6b, 6c for correcting the electric field of the accelerating electrode Beam passing hole of the metal plate for correcting the electric field of the final accelerating electrode 7 Die 8 Metal plate 8a Hole 9 Hole punched with mirror-finished side surface 10 punched with satin side surface 11 Punch 12 with a hairline finish on the side 12 Punch with a mirror finish on the bottom of the side 13 Punch with a satin finish on the top of the side 13 Punch with a mirror finish on the bottom of the side and a hairline finish on the top of the side 14 Electron gun 21 Electron gun 21 Electron beam 21 22 Cathode 23 Control Electrode 24 Accelerating Electrode 25 Prefocus Lens 26 Main Lens

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Konishi 1-1-1 Tsukiwa, Otsu-shi, Shiga Nisshin Kogyo Co., Ltd.

Claims (6)

[Claims] 1. A method of manufacturing an electrode for an electron gun, comprising forming a hole in a metal plate to be processed by shearing punching, and then performing shearing punching again on the hole, wherein a side surface is mirror-finished in the first shearing punching. Electron gun electrode characterized by using a punch that has been finished, and a punch having a structure that has been subjected to surface processing so that a slight space portion is formed between the hole and the shear surface of the hole in the shear punching process again Manufacturing method. 2. The method for manufacturing an electrode for an electron gun according to claim 1, wherein a punch having a satin-finished side surface is used for the second shear punching process. 3. The method for manufacturing an electrode for an electron gun according to claim 1, wherein a punch having a hairline-finished side surface is used for the second shear punching process. 4. A method for manufacturing an electrode for an electron gun, comprising forming a hole in a metal plate to be processed by shear punching, and then performing shear punching on the hole, wherein the side surface is mirror-finished in the first shear punching. Using a punch that has been finished, a punch with a structure where the lower part of the side surface is mirror-finished in the shear punching process again, and a surface process is performed on the upper part of the side surface to create a slight space between the hole and the shear surface of the hole. A method for manufacturing an electrode for an electron gun, which is used. 5. The method of manufacturing an electrode for an electron gun according to claim 4, wherein a punch having a mirror-finished lower side surface and a satin-finished upper side surface is used for the second shear punching. 6. The method of manufacturing an electrode for an electron gun according to claim 4, wherein a punch having a mirror-finished lower side surface and a hairline-finished upper side surface is used for the second shear punching.