JPH05301A - Sheet for fe-ni shadow mask and production thereof - Google Patents

Abstract

PURPOSE:To prevent the seizure at the time of etching and annealing and to easily obtain the sheet of the shadow mask of the Fe-Ni shadow mask by speci fying the surface roughness of a steel sheet for the shadow mask. CONSTITUTION:The surface roughness of the steel sheet for the Fe-Ni shadow mask is specified to 0.3 to 0.8mum RsK+0.5 to +1.2 to adequately prevent the adhesion and seizure at the time of the etching and annealing. The upper limit of the Ra is specified to 0.8, by which the etching is adequately executed. Further, the upper limit of the RsK is specified to +1.2, by which the generation of the unequal etching is prevented and the easy tendency to generation again of the seizure by the excessive etching is averted.

Description

Detailed Description of the Invention

[0001]

SUMMARY OF THE INVENTION The present invention relates to a thin plate for an Fe-Ni-based shadow mask and a method for manufacturing the thin plate, and has a suitable plate surface roughness.
An object of the present invention is to provide a thin plate for an Fe-Ni-based shadow mask and a method for producing the thin plate, which is simple and stable, and can be manufactured at a relatively low cost.

[0002]

[Industrial field of use] Fe-Ni with an appropriate plate surface roughness
Plate for metal shadow mask and its manufacturing technology.

[0003]

2. Description of the Related Art It is necessary that the plate surface of a shadow mask has an appropriate roughness to ensure good etching properties and to prevent adhesion during annealing after etching.

In particular, Fe-Ni-based Invar alloy, which has been attracting attention as a low thermal expansion shadow mask material capable of coping with the problem of color misregistration in recent years as color televisions have become higher in quality, is a conventional shadow mask made of low carbon steel. Compared to wood,
When the flat mask after etching is annealed, the adhesion bakeability is remarkable. However, no preferred proposal has been made to solve this problem.

That is, as in Japanese Patent Laid-Open No. 62-238003, the adhesion baking during annealing of the conventional low carbon steel flat mask is optimized for the surface roughness, that is, Ra is 0.2-2.
Although there are proposals to make Rsk (index of deviation of roughness curve in the height direction) to be 0 or more at 0 μm, in the case of Fe-Ni based Invar alloy, the technical situation is different from that of low carbon steel. The state of occurrence of adhesion seizure during annealing in a flat mask made of an Fe-Ni-based Invar alloy is also different, and the Rsk was about -2 or -3 in the comparative example of the invention, but +0.2 in the example. However, a preferable technique for preventing seizure at the time of annealing the Fe—Ni-based Invar alloy flat mask is not found.

[0006]

In the prior art as described above, only the adhesion seizure during annealing of the low carbon steel flat mask is prevented, and the strength of the above-mentioned Fe-Ni alloy Invar alloy is low. It is higher than carbon steel, and the annealing temperature before curved surface press forming is inevitably higher than that of low carbon steel.In this case, in this conventional technology, seizure prevention during invar alloy flat mask annealing I can't do it. fact,
The surface roughness achieved by this conventional technique is Ra 0.65 μm,
The Invar alloy having Rsk + 0.2 had remarkable adhesion seizure during annealing.

As another method, shot blasting and electric discharge machining are also partially performed, but in the rolling using the rolls subjected to this machining, Rsk can be obtained only about +0.4. It cannot meet the demand for the shadow mask as described above.

[0008]

[Constitution of the invention]

The present invention has been made by studying to solve the above-mentioned problems in the conventional ones, and is as follows.

The surface roughness of the steel sheet is Ra 0.3 to 0.8 μm, Rsk
Fe-Ni type shadow mask thin plate characterized by having +0.5 to +1.2.

Diameter 6 which is dulled to 0.6 to 1.6 μm Ra
A pair of upper and lower small diameter work rolls of 0 to 120 mmφ are brought into contact with each other with a unit width load of 0.05 to 0.20 Ton / mm, and 1000
After rolling for 10000 rotations, it is rolled using the roll to obtain a steel plate surface roughness Ra 0.3 to 0.8 μm, Rsk + 0.5 to +
A method for manufacturing a thin plate for a Fe-Ni-based shadow mask, which is characterized in 1.2.

[0011]

[Function] By setting the surface roughness to be Ra 0.3 or more and Rsk to be 0.5 or more, the post-etching annealing of the low thermal expansion Fe-Ni type shadow mask capable of quickly responding to the color misregistration accompanying the high quality of the color television recently. Properly prevent contact sticking during
Further, by setting the upper limit of Ra to Ra 0.8, etching can be properly performed. Further, by setting the upper limit of Rsk to 1.3, it is possible to prevent the occurrence of etching unevenness and to prevent the baking from being likely to occur again due to excessive etching.

In the production of the above shadow mask material, a work roll having a diameter of 60 mm or more is used to perform appropriate surface roughness processing on the steel plate surface, and in addition, the roll durability is obtained, and the diameter is 120 mmφ or less. Thus, the surface roughness as described above is accurately formed.

By using a roll which is dull-processed to 0.6 to 1.6 μm Ra, the depth of the concave portion of the roll surface obtained after the rolling treatment is properly secured.

Unit width load of 0.
By contacting at 05 Ton / mm or more and rolling, the convex portion formed by the dull processing is properly removed to obtain an effective processing result, and this unit width load is 0.20 T
By setting it to be on / mm or less, it is possible to prevent abnormally removing the convex portion due to the dull processing and damaging the concave portion, and damaging the backup roll surface during rolling as much as possible. Also, by setting the number of times of rolling to 1000 times or more, it is possible to preferably remove the convex portion of the dull processing, and by setting the upper limit to 10000 times, it is possible to avoid an increase in rolling fatigue of the roll and deterioration due to it, for efficient processing. Get it. Even if it is rolled further industrially, the effect is small.

As described above, the convex portion due to the dull processing is substantially eliminated and the roll surface having the concave portion as a main component is formed, whereby a plate having a large number of convex portions by the shadow mask rolling by the roll, that is, Ra 0.3 to 0. A plate with a high Rsk can be obtained accurately at 0.8 μm.

The roll dull machining as described above in the present invention may be carried out by any of a grindstone, a laser beam, shot blasting, electric discharge machining, etc., but preferably by electric discharge machining or shot blasting with little directionality and regularity. Is suitable, and all of the examples described below employ shot blasting.

[0017]

EXAMPLES The specific embodiments of the present invention as described above will be explained below.
A thin plate for a shadow mask made of Fe alloy was manufactured with various changes in the plate roughness Ra and Rsk after rolling, and after the etching of these flood masks, the presence or absence of adhesion baking and the occurrence of unevenness during etching. Was examined. That is, the surface roughness of such a thin plate for a shadow mask and the adhesion after annealing are summarized below.
Is like.

[0018]

[Table 1]

That is, in the case of A, Ra satisfies the requirements of the present invention, but Rsk is low, and in the cases of H and I, Rsk does not satisfy, and in the cases of K and L, Rsk is the requirement of the present invention. When Ra does not reach the present invention,
In both cases, the occurrence of seizure after annealing is recognized. For these,
In C to G and J, both Ra and Rsk were within the scope of the present invention, and it was not possible to recognize the occurrence of seizure after annealing. For B and K to N, either one or both of Rsk and Ra is outside the scope of the present invention, and any one or both of baking and etching unevenness are recognized.

An example of the manufacturing method for obtaining the thin plate for the shadow mask as described above will be explained. In obtaining the thin plate with a 36% Ni-Fe alloy,
Shot blasting with 800 and 1600 rolling with a unit width load of 0.15 Ton / mm applied to a pair of upper and lower rolls with a diameter of 100 mmφ which were dull processed to about 1.2 μm Ra. The result of measuring the profile of the roll surface is as shown in FIG. 1. For the conventional one which was merely shot blasted in (A), the one which was rolled 800 times after the dull processing was ( As in B), many protrusions still remain on the surface of the roll, and the appearance is similar to that of the shot blast of (A).

On the other hand, when the number of times of rolling is further increased, the number of convex portions is greatly reduced, and the case of rolling 1,600 times has almost no convex portions as shown in FIG. 1 (C). It was confirmed that the recess was the main component, and that Ra was 0.3 to 0.8 μm and Rsk + 0.5 or more according to the following formula.

[0022]

[Equation 1]

Thus, FIG. 1 obtained as described above.
Using the rolls of (A) and (B) and the roll of the present invention shown in (C) of the drawing, rolling of the shadow mask with the 36% Ni-Fe alloy was carried out according to the rolling schedule shown in Table 2 below. .

[0024]

[Table 2]

The plate roughness obtained by such rolling is shown in Table 3 below together with the roll roughness. Ra rolled is 0.65 μm according to the present invention. However, Rsk showed a high value of +1.0, and it was confirmed that the Rsk was excellent in the etching property and the adhesion prevention effect during annealing after enching.

[0026]

[Table 3]

The relationship between the number of idle rotations and the roll roughness for one example of the roll shot blasting according to the present invention is as shown in FIG. That is, it shows the influence of the idling number and width load on the roll roughness for a roll having a roll diameter of 120 mmφ and a material corresponding to SKD, and is as follows. With a width load of 0.1 Ton / mm, the roll wear becomes stable after 1000 rotations. That is, the convex portions of the roll are sufficiently removed, and Rsk of the rolled material is improved. Roll wear does not progress at a width load of 0.03 Ton / mm. At a width load of 0.06 Ton / mm, it ends after about 1200 rotations.

Table 4 below shows the conditions for shot blasting of rolls, the roll roughness after idling, the number of idlings and the plate roughness after rolling. Nos. 1 and 2 are comparative examples. 3-
7 is based on the conditions of the present invention, and the idling width load is 0.1
Ton / mm.

[0029]

[Table 4]

The rolling schedule of the above-mentioned Table 4 is as shown in Table 5 below.

[0031]

[Table 5]

Further, the examples shown in Tables 4 and 5 above are representative comparative examples. Regarding No. 1 and No. 5 which is an example of the present invention, the profile of the rolling roll and the profile of the plate after rolling are shown separately in FIG. 3, and the one according to the present invention is the comparative example. In comparison, both Ra and Rsk are greatly improved, and it is clear that the product according to the present invention can obtain a preferable product thin plate.

[0033]

According to the present invention as described above, the plate surface roughness of the shadow mask is Ra 0.3 to 0.8 μm, R
When sk + 0.5 or more, adhesion baking during etching annealing can be appropriately prevented, and a thin plate for a shadow mask having such characteristics can be easily and accurately manufactured. Cheaply obtained,
Further, it is possible to improve the yield, and it is easy to roll the roll, and even from this point, the shadow mask can be advantageously obtained.
It is an invention that is industrially highly effective.

[Brief description of drawings]

FIG. 1 is a chart of the results of measuring each profile of a roll used in the present invention and a roll according to a conventional example and a comparative example.

FIG. 2 is a table showing the relationship between roll roughness and idling load for one example of the roll according to the present invention, when the width load is changed.

FIG. 3 is a chart showing one example of a profile by shot blasting of a roll and a profile of a thin plate obtained thereby according to the present invention, in comparison with that by a conventional method.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Makoto Yamada             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd.

Claims (2)

[Claims] 1. A steel sheet having a surface roughness Ra of 0.3 to 0.8 μm, R
A thin plate for a Fe-Ni-based shadow mask characterized by having sk +0.5 to +1.2. 2. A pair of upper and lower work rolls having a diameter of 60 to 120 mmφ, which is dulled to 0.6 to 1.6 μm Ra, is brought into contact with a unit width load of 0.05 to 0.20 Ton / mm, and 100
After rolling for 0 to 10000 rotations, it is rolled using the roll to obtain a steel plate surface roughness Ra 0.3 to 0.8 μm, Rsk + 0.5 to
A method for manufacturing a thin plate for a Fe-Ni-based shadow mask, characterized in that the thickness is +1.2.