KR900001703B1 - Shadow mask spring and its product method - Google Patents

Abstract

The shadow mask spring for compensating the doming phenomenon comprises a contacting part (4a") linked with a stud pin of the shadow mask front panel, a moving part (4b") compensating the heat expansion, and a welding part (4c") welded to a mask supporter. The material of the spring is composed of a low expansion alloy placed at the middle section and a high expansion alloy placed at the both sides of the middle section, but the width (c) of the low extension alloy is minimiyed so that the expensive low extension alloy is consumed to minimum when a pair of spring is manufactured simultaneously by the punching press.

Description

Spring for shadow mask of color water pipe and manufacturing method

1 is a cross-sectional view of a conventional color water pipe.

2a and 2b are a plan view and a side view showing a spring for the shadow mask of the color water pipes commonly used.

3A and 3B are plan views showing one example of the shadow mask spring of the color water pipe according to the prior art.

4A and 4B are explanatory views for explaining the manufacturing method of the shadow mask spring of the color water pipe according to the prior art.

5 is an explanatory diagram for explaining a shadow mask manufactured by the manufacturing method for the shadow mask of the color water pipe according to the present invention.

* Explanation of symbols for main parts of the drawings

4 ＂: Spring 4＂ a: Crimping part

4 ＂b: Movable part 4＂ c: Welded part

H: High Expansion Alloy L: Low Expansion Alloy

C: width

The present invention relates to a method for manufacturing a shadow mask spring of a color water pipe, and more particularly, to a method for manufacturing a spring for a shadow mask that minimizes the use of expensive low-expansion alloy to reduce manufacturing cost.

As shown in FIG. 1, a general color water pipe is formed with a stripe or lot type fluorescent film 2 emitting red, green, and blue light on the inner surface of the front panel 1, and the front panel. A plurality of stud pins 3 are fixed to the inner side of the edge surface 1 so that fixing holes formed with one side of the spring 4 are inserted, respectively, and the other side of the spring 4 has a shadow mask 5 having a plurality of slit holes formed therein. ) Is fixed to the surgical edge surface of the mask supporter 6 to be fixed, and the neck 7 behind the front panel 1 is arranged in a line along the horizontal axis of the front panel 1 so that the red, green, and blue fluorescent films An electron gun 8 for firing three electron beams is fixed to (2), and the three in-line arrays of electron beams 9 emitted from the electron layer 8 are connected to the funnel 10. It is deflected by the deflection yoke 11 installed at one side and is formed through the slit hole of the shadow mask 5. The color film is reproduced in the optical film 2.

Such a color shadow tube for a shadow mask, which is about 80% of the electron beams emitted from the electron gun 8, hits the shadow mask 5 to heat-expand the shadow mask 5 to about 80 °, thus fluorescence When the distance between the film 2 and the shadow mask 5 (hereinafter referred to as Q value) is changed so that the above-described deformation amount of the Q value is more than the allowable value, the electron beam 9 is released from the fluorescent film 2 and the other color is obtained. Doming phenomenon occurs in which color purity is lowered by emitting light.

In order to compensate for such a doming phenomenon, the spring 4 is manufactured and used in the shape of FIGS. 3a and 6b in the shadow mask type color receiving pipe, and the spring 4 of FIG. 3a has a different coefficient of linear expansion. The double alloy is formed by electron beam welding or plasma welding in the width direction, and the spring 4 is constructed from the stud pins 3 of the front panel 1 as shown in FIG. It consists of the welding part 4c for joining with the crimping | compression-bonding part 4a which attaches and detaches, the movable part 4b which corrects thermal expansion, and the mask support body 6. As shown in FIG.

In addition, in the spring 4 'shown in FIG. 3B, the base plate 12, in which the alloys having different linear expansion coefficients are joined in the thickness direction, is fixed by welding. Such a spring 4' is made of a base plate. The spring 4 as shown in Fig. 3a is widely used because the structure 12 is welded and the structure is complicated and the quality is uneven, so that the structure is simple and uniform in quality.

As described above with reference to the accompanying drawings the spring (4) widely used in the shadow mask type color water pipe as follows.

As shown in Figs. 2A and 2B, the width b, length l and thickness t of the movable portion 4b are in accordance with the mechanical strength required during the handling and operation of the color receiver. It is determined by the deflection of the thermal expansion.

On the other hand, the width b 'of the crimping portion 4a is set to a value of b'> = 1.2b so as to facilitate repeated detachable work for applying the fluorescent film 2 during the manufacturing process of the color water pipe. The material is made of stainless steel and nickel alloy with excellent elasticity.

Comparing the properties according to the accompanying chart as follows.

TABLE 1

TABLE 2

Table 1 above compares the chemical properties of the high expansion alloy and the low expansion alloy, and Table 2 compares the physical properties, and the high expansion alloy is 18-8 stainless steel, and the low expansion alloy is linear expansion. It is an invar alloy steel with FN36 whose coefficient (alpha) ₁ is 1.5x10 <^-6> / degreeC.

In this way, the different alloys described above are maintained at the same thickness (t) through several rolling processes to maintain the physical properties specified in Table 2, respectively, and then the low-expansion alloy (L) of the in-var alloy among the two alloys is centered. The high expansion alloy (H) made of stainless steel is joined to both sides by electron beam welding or plasma welding.

When the welding operation is completed, the melting point bead surface is smoothed, and after degreasing treatment, the cutting is completed to a predetermined width. The material thus processed is shown in FIGS. 4a and 4b by using a press and a mold. As described above, the punching is made alternately in the development of the spring 4 by blanking, and then subjected to surface treatment after the bending and piercing processing.

In the assembly with the mask support 6, the residual stress generated during the press working is removed by heat treatment, followed by electrical resistance welding.

On the other hand, the cost of the material is inversely proportional to the nickel content, and stainless steel, a high-expansion alloy with low nickel content, is about 1.8-2.2 times cheaper than invar alloy steel, and has high tensile strength and Vickers, which is strongly resistant to external gravity. Therefore, since the position of the shadow mask 5 is always constant, the color purity can be kept constant.

However, this spring manufacturing method of the conventional shadow mask type color water pipe was not as conventional as shown in Figure 4a. In other words, the method of FIG. 4a removes unnecessary parts of the expensive low-expansion alloy L by performing punching work in a line on the material processed with the high-expansion alloy (H) and the low-expansion alloy (L). The method also has a problem in that the manufacturing cost is increased by removing the expensive low-expansion alloy (L) unnecessarily.

The present invention was devised to solve such a conventional problem. As shown in FIG. 4B, a material having a high expansion alloy attached to both sides of a low expansion alloy in an intermediate portion is provided on the low expansion alloy side. By arranging a part of the crimping part of the spring alternately to the stainless steel side of high expansion alloy and punching two springs at the same time, it is possible to reduce the manufacturing cost by minimizing the use width of expensive low expansion alloy. More detailed description is as follows.

As shown in FIG. 5, the movable part 4'b of the spring 4 'which corrects thermal expansion in the state where the high expansion alloy H is joined to the upper and lower sides of the low expansion alloy L is attached. A portion of the crimped portion (4 ＂a) excepted is arranged with a high expansion alloy (H) as shown by hatching to minimize the width (C) of the low expansion alloy (L) and then press during blanking of the spring (4). Machining is made by limiting the remaining width to the allowable limit and then alternately arranged up and down to punch two springs (4 ＂) simultaneously.

In the figure, reference numeral 4 ＂c shows a welded part.

At this time, the direction of the punching is to be matched with the dark direction of the material, it is preferable that the spacing of the two springs (4 잔여), that is, the remaining width of the press working is 1.5-2.0 times the thickness (t) of the allowable limit.

Thus, the effect of the material cost produced by manufacturing the spring 4 ＂by this invention is as follows.

For example, in the case of a 14-inch color water pipe, the material costs according to the methods of FIGS. 4A and 4B and the material costs according to the method of FIG. 5 according to the present invention are shown in Table 3.

TABLE 3

As compared with the conventional method, the manufacturing cost of 25-45% can be reduced.

Claims (1)

A spring composed of a crimped portion 4'a, a movable portion 4'b and a welded portion 4'c, using a material having a high expansion alloy H attached to both sides of the low expansion alloy L in the middle portion ( In the production of 4), two springs 4 ＂are alternately punched out at the same time, and predetermined portions of the crimped portion 4＂ a are arranged on the high expansion alloy H side, respectively. L) The method for producing a spring for the shadow mask of the color water pipe, characterized in that to minimize the width (C).

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