JPH0279332A - Manufacture of spring for shadow mask support - Google Patents

Abstract

PURPOSE:To prevent generation of warps by the temperature deference in the air so as to improve processing efficiency by juxtaposing high expansion metallic belts on both sides of a low expansion metallic belt and joining two linear junction parts with each other so as to form a three layer metallic belts, and then stamping out springs in symmetrical arrangement. CONSTITUTION:High expansion metallic belts 13 of the same widths are juxtaposed on both sides of a low expansion metallic belt 12. In this case, the low expansion metallic belt 12 and the high expansion metallic belts 13 are juxtaposed while being applied with tension respectively. Two electron beams or carbonic acid gas lasers are applied at the same time along two linear junction parts 10 and 10 in vacuum so as to join each other to make it into a three-layer metallic belt 15. Next, springs 5 are punched out in symmetrical arrangement by press processing. Even if temperature change occurs in the air, of stress can be balanced, and a warp in the form of curve to the direction of width does not occur, and spring processing can be stabilized.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for manufacturing a shadow mask support spring used for supporting a shadow mask of a shadow mask type color picture tube on the inner surface of a panel, and particularly relates to a method for manufacturing a shadow mask support spring used for supporting a shadow mask of a shadow mask type color picture tube on the inner surface of a panel. The present invention relates to a method of manufacturing a spring in which high-expansion materials and low-expansion materials with different coefficients are mutually joined.

[Conventional technology]

In general, a shadow mask type color picture tube has a shadow mask 2 provided on the inner surface of a panel 1, as shown in FIG.
This shadow mask 2 is made up of a support frame 3 for reinforcing the shadow mask 2, and a spring 5 which is fixed to the side surface of the support frame 3 and which causes the circular surface of the panel 1 to fit into the panel bin 4 inserted therein. Includes a mask assembly. It is also equipped with an electronic shield 6 that shields secondary electrons from the electron gun and an inner shield 7 that suppresses the influence of earth's magnetism.

As shown in FIG. 4, the spring 5 is made of Fe-
A low-expansion material 8 made of 36% Ni or the like and a high-expansion material 9 made of 8US-304 or the like are placed in parallel and joined together at joint portions 10 using an electron beam. Further, a through hole 11 into which a panel pin 4# is inserted is provided at the tip end of the spring 5. Incidentally, examples related to this type of manufacturing method include JP-A-60-157139.

By the way, as shown in FIG. 5, the spring 5 having such a configuration includes a low expansion metal band 12 which becomes the low expansion material 8,
A two-layer metal band 14 is formed by arranging the high-expansion metal band 13 which becomes the high-expansion material 9 and mutually bonding the linear joint portions 1o with an electron beam. Manufactured by punching.

[Problem to be solved by the invention]

The above conventional technology has a low expansion metal band 12 and a high expansion metal band 13.
Since the two-layer metal band 14 is formed by joining the two-layer metal band 14, there is a problem that the two-layer metal band 14 is curved in the width direction due to the temperature difference E in the atmosphere. If scraping occurs in the double-layer metal band 14I in this way, it will cause scratches during the punching process of the spring 5.
If the thickness end face of the material feed guide member t of the double-layer metal strip 14 is pulled or the force is 1, press working cannot be performed.

The shape of the spring 5 is L-shaped on the longitudinal plane of the two-layer metal strip 14, as shown in FIG.
There were problems with poor processing efficiency and material yield.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a spring for supporting a shadow mask, which does not cause warping due to the temperature difference f in the atmosphere and can improve processing efficiency and material yield.

[Means to solve the problem]

The above objective is achieved by placing a high expansion metal strip on both sides of a low expansion metal strip, joining two linear joints to each other to form a three-layer metal strip, and then punching out springs in a symmetrical arrangement. be done.

[Effect]

Since the high-expansion metal strips are juxtaposed on both sides of the low-expansion metal strip, the stress is balanced, and no curved warpage occurs in the width direction of the plate. Furthermore, when a spring is obtained by punching a three-layer metal strip using a press, the springs can be punched in a symmetrical arrangement, which improves processing efficiency and material yield.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In addition, the same reference numerals are attached to the same pots or equivalent members as in FIGS. 3 to 5 for explanation.

First, as shown in FIG. 1, high expansion metal bands 13 having the same width are placed on both sides of a low expansion metal band 12.

In this case, the low-expansion metal band 12 and the high-expansion metal band 13 are placed in parallel without applying tension in the width direction.

Then, two electron beams or carbon dioxide gas lasers are irradiated almost simultaneously along the two linear joints 10 and 10 in a vacuum to bond them together to form the three-layer metal band 15.

Next, as shown in FIG. 2, the springs 5 are punched out using a press in a symmetrical arrangement.

In this way, the three-layer metal strip 15 has the high expansion metal strips 13 juxtaposed on both sides of the low expansion metal strip 12, so even if a temperature change occurs in the atmosphere, the stress is balanced and the width direction φ In addition, since the joints 10 are linearly joined in a vacuum using an electron beam or carbon dioxide laser, the welding strength is sufficient even if the bead width of the joints 10 is equal to or smaller than the plate thickness. It is luxurious, requires only a short irradiation time with an electron beam or carbon dioxide laser, and has little residual stress due to thermal strain.

Further, since the spring 5 is punched out from the three-layer metal strip 15 in a symmetrical arrangement, the press punching speed is approximately doubled, and the material yield is also improved by 20 to 30%, resulting in a significant cost reduction.

In addition, in FIG. 2, the mutual spacing between the springs 5 and the spacing between the end surface of the high expansion metal strip 13 and the outer end surface of the spring 5 should be kept at 2 to 2.5 times the thickness of the three-layer metal strip 15. is preferred.

〔Effect of the invention〕

61 According to the present invention, spring processing can be stabilized without being affected by temperature differences in the atmosphere, and processing efficiency and material yield can be improved.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, FIG. 1 is a perspective view showing a part of a three-layer metal band, and FIG. 3 is a vertical cross-sectional view of a main part of a shadow mask type color picture tube, FIG. 4 is a plan view of a spring, and FIG. 5 is a plan view showing a conventional spring manufacturing method. 5... Spring, 8... Low expansion material, 9
... High expansion material, 10 ... Joint part, 12
...Low expansion metal band, 13...High expansion metal band,
15...Three-layer metal band.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a spring, which is a member for supporting a shadow mask of a shadow mask type color picture tube on the inner surface of a panel, in which a high expansion material and a low expansion material are mutually bonded with respect to thermal expansion. A spring for supporting a shadow mask, characterized in that high-expansion metal bands are juxtaposed on both sides of a metal band, two linear joints are mutually joined to form a three-layer metal band, and then springs are punched out in a symmetrical arrangement. manufacturing method. 2. A patent characterized in that the two linear joints are joined together by welding the joints with an electron beam or carbon dioxide laser while applying tension to each of the three parallel metal strips. A method for manufacturing a shadow mask supporting spring according to claim 1. 3. The method of manufacturing a spring for supporting a shadow mask according to claim 1, wherein the two linear joints are joined together almost simultaneously.