JP2841941B2 - Thin plate for Fe-Ni-based shadow mask and method for producing the same - Google Patents

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 producing the same, and the surface roughness of the plate is determined to be appropriate.
An object of the present invention is to provide a thin plate for an Fe-Ni-based shadow mask and a method that can be manufactured easily, stably, and at a relatively low cost.

[0002]

[Industrial application] Fe-Ni with proper surface roughness
Thin plate for shadow mask and its manufacturing technology.

[0003]

2. Description of the Related Art The surface of a plate of a shadow mask needs to have an appropriate roughness to ensure good etching properties and prevent adhesion during annealing after etching.

[0004] In particular, in the case of Fe-Ni-based invar alloys, which have been receiving 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, conventional shadow masks made of low carbon steel are used. Compared to wood,
When the flat mask after etching is annealed, the adhesion baking property is remarkable. However, no favorable proposal has been made to solve this problem.

That is, as disclosed in Japanese Patent Application Laid-Open No. Sho 62-238003, the conventional baking of low carbon steel flat masks during annealing is performed by optimizing the surface roughness, that is, when Ra is 0.2 to 2.2.
Although there is a proposal to make Rsk (index of the deviation of the roughness curve in the height direction) 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. Rsk was about -2 or -3 in the comparative example of the present invention, whereas Rsk was +0.2 in the example. However, there is no preferred technique for preventing seizure during flat mask annealing of the Fe-Ni-based Invar alloy.

[0006]

In the prior art as described above, only the adhesion seizure during annealing of a 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 its annealing temperature before curved surface press forming must be higher than that of low carbon steel.In this case, in this conventional technology, prevention of seizure during annealing of Invar alloy flat mask Can not do. fact,
The surface roughness achieved by this conventional technique, Ra 0.65 μm,
The invar alloy having Rsk + 0.2 had remarkable adhesion seizure during annealing.

[0007] As another method, shot blasting and electric discharge machining are also partially performed, but Rsk can be obtained only about +0.4 by rolling using a roll that has been subjected to this machining. It is not possible to meet the demand for the shadow mask as described above.

[0008]

Configuration of the Invention

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned conventional problems and has been made as follows.

The surface roughness of the steel sheet is Ra 0.3 to 0.8 μm, Rsk
A thin plate for an Fe-Ni-based shadow mask, wherein the thickness is +0.5 to +1.2.

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

[0011]

[Function] By post-etching annealing of a low thermal expansion Fe-Ni-based shadow mask capable of immediately responding to color misregistration accompanying color television quality improvement by setting the surface roughness to Ra 0.3 or more and Rsk to 0.5 or more. Properly prevent seizure during printing,
By setting the upper limit of Ra to 0.8 μm , the etching can be properly performed. Further, the baking is prevented from becoming easily generated again by becoming excessive while preventing the occurrence of uneven etching by an upper limit of Rsk + 1. and 2.

In the production of the above-mentioned shadow mask material, a work roll having a diameter of 60 mm or more is used so that the surface of the steel sheet can be appropriately subjected to surface roughness processing, and the roll durability can be obtained. Thus, accurate formation of the surface roughness as described above is achieved.

By using a roll dulled to 0.6 to 1.6 μm Ra, the depth of the concave portion of the roll surface obtained after the rolling process is properly secured.

The dulled roll has a unit width load of 0.
By contacting at a speed of at least 0.05 Ton / mm and rotating and rolling, the convex portion formed by dulling is appropriately removed to obtain an effective working result, and the unit width load is reduced to 0.20 T.
By setting it to on / mm or less, it is possible to avoid as much as possible that a convex part due to dulling is abnormally removed, a concave part is damaged, and a backup roll surface is not damaged during rolling. The dulling convex portion is preferably removed by setting the number of rolling times to 1,000 or more, and by setting the upper limit to 10,000 times, it is possible to avoid an increase in rolling contact fatigue and deterioration due to the rolling fatigue, thereby enabling efficient working. Get it. Even if it rolls more than industrially, the effect is small.

As described above, the convex portion due to the dulling process is substantially eliminated, and the roll surface mainly including the concave portion is formed, so that a plate having a large number of convex portions by the shadow mask rolling by the roll, that is, Ra 0.3 to 0.3. A plate with a high Rsk at .8 μm can be obtained accurately.

In the present invention, the roll dulling as described above may be performed by any of a grindstone, a laser beam, shot blasting, electric discharge machining, and the like, but preferably by electric discharge machining and shot blasting with less directivity and regularity. In all of the embodiments described below, shot blasting was employed.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific embodiment of the present invention as described above will be described.
Regarding the thin plate for shadow mask made of Fe alloy, the plate roughness after rolling was manufactured with various changes in Ra and Rsk, and the presence or absence of occurrence of adhesion seizure when annealing the flood mask after etching and the occurrence of unevenness during etching Was considered. That is, the following summarizes the adhesion of such a shadow mask thin plate after surface roughness annealing.
It is like.

[0018]

[Table 1]

That is, in the case of A, the Ra satisfies the requirements of the present invention, but the Rsk is low. In the case of H and I, the Rsk does not satisfy the requirements of the present invention. Is satisfied, but Ra does not reach the present invention,
In any case, seizure occurs after annealing. In contrast,
In samples C to G and J, both Ra and Rsk were within the scope of the present invention, and no occurrence of seizure after annealing was observed in any of the samples. In the cases of B and K to N, one or both of Rsk and Ra are outside the scope of the present invention, and one or both of printing and unevenness in etching are observed.

However, an embodiment relating to a manufacturing method for obtaining a thin plate for a shadow mask as described above will be described. In obtaining the thin plate with a 36% Ni-Fe alloy,
Rolling 800 times and 1600 times with a unit width load of 0.15 Ton / mm applied to a pair of upper and lower rolls with a diameter of 100 mm and dulled to about 1.2 μm Ra and shot blasting The result of measuring the profile of the roll surface of the roll obtained is as shown in FIG. 1, and the roll obtained by rolling 800 times after dulling is (A) As shown in B), a lot of protrusions still remain on the roll surface, and the appearance is similar to that of (A) shot blast.

On the other hand, by further increasing the number of rollings, the number of protrusions is greatly reduced, and the one that has made 1600 rollings has almost no protrusions as shown in FIG. 1 (C). It was confirmed that the recess was mainly used. The number of Rsk
The formula is as follows:

[0022]

(Equation 1)

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

[0024]

[Table 2]

The plate roughness obtained by such rolling is shown in the following Table 3 together with the roll roughness, and the Ra rolled by the roll rotated 1600 times according to the present invention has Ra of 0.65 μm. However, Rsk showed a high value of +1.0, and it was confirmed that Rsk was excellent in etching property and adhesion preventing effect at the time of annealing after etching.

[0026]

[Table 3]

FIG. 2 shows the relationship between the number of idling times and the roll roughness in one example of the roll shot blasting according to the present invention. That is, the effects of the number of idling times and the width load on the roll roughness of a roll having a roll diameter of 120 mmφ and a material corresponding to SKD are shown as follows. With a width load of 0.1 Ton / mm, the roll abrasion becomes stable after 1000 rotations. That is, the convex portion of the roll is sufficiently removed, and the Rsk of the rolled material is improved. Roll wear does not progress at a width load of 0.03 Ton / mm. With a width load of 0.06 Ton / mm, it ends at about 1200 revolutions.

The following Table 4 shows the conditions of the shot blast dulling of the roll, the roll roughness after idling, the number of idling times, and the plate roughness after rolling. 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 Table 4 described above is as shown in Table 5 below.

[0031]

[Table 5]

Further, in Tables 4 and 5 described above, comparative examples are representatively shown. 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 separately shown in FIG. On the other hand, both Ra and Rsk are greatly improved, and it is clear that the product according to the present invention gives a preferable product sheet.

[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
By setting sk + 0.5 or more, it is possible to appropriately prevent adhesion burning during etching annealing, and to easily and accurately manufacture a thin plate for a shadow mask having such characteristics. Cheaply obtained,
In addition, it is possible to improve the yield, and furthermore, it is very easy to perform a rolling process on the roll, and from this point, it has an effect of obtaining a shadow mask advantageously,
This invention is industrially effective.

[Brief description of the drawings]

FIG. 1 is a table showing the results of measuring the profiles of a roll used in the present invention and rolls according to a conventional example and a comparative example.

FIG. 2 is a chart showing the relationship between the roll roughness and the idling load for one example of the roll according to the present invention, together with the case where the width load is changed.

FIG. 3 is a table showing one example of a profile of a roll obtained by shot blasting of a roll and an example of a profile of a thin plate obtained thereby in comparison with a profile obtained by a conventional method.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Makoto Yamada 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (56) References JP-A-2-197301 (JP, A) JP-A-2 -25201 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21B 1/22 B21B 3/00-3/02 H01J 9/14 H01J 29/07

Claims (2)

(57) [Claims] 1. A steel sheet having a surface roughness of Ra 0.3 to 0.8 μm,
A thin plate for an Fe-Ni-based shadow mask, wherein sk is set to +0.5 to +1.2. 2. A pair of upper and lower small-diameter work rolls having a diameter of 60 to 120 mmφ dulled to 0.6 to 1.6 μm Ra are brought into contact with a unit width load of 0.05 to 0.20 Ton / mm, and
After rolling from 0 to 10000 revolutions, the rolls are rolled using the rolls to have a surface roughness of Ra 0.3 to 0.8 μm, Rsk + 0.5 to
+1.2, a method for producing a thin plate for a Fe-Ni-based shadow mask.