JPH05177212A - Thin sheet for fe-ni shadow mask and production thereof - Google Patents

Abstract

PURPOSE:To provide the process which can easily and stably produce the thin sheet for an Fe-Ni shadow mask made to have adequate surface roughness. CONSTITUTION:Rolls dulled to 0.6mum<=Ra<=1.6mum and 2.0<=Rku<=5.0 are used, by which the Ra after a rolling treatment is adequately maintained and the roll patterns are properly assured. The roughness after the rolling is thus made into 0.3mum<=Ra<=0.8mum and 3.0<=Rku<=7.0, by which the seizure at the time of annealing the flat mask is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Fe-Ni-based shadow mask thin plate having an appropriate surface roughness and a method for producing the same.

[0002]

2. Description of the Related Art It is necessary that the plate surface of a shadow mask has a suitable roughness for preventing adhesion during annealing after etching while ensuring good etching properties. In particular, Fe-Ni-based Invar alloys, which have recently attracted attention as low-thermal-expansion shadow mask materials capable of coping with the problem of color misregistration along with the development of high-quality color TVs,
Compared with the conventional low carbon steel shadow mask material, the flat mask after etching has a high annealing temperature, and the adhesion sticking is remarkable. However, no preferred proposal has been made to solve this problem.

That is, as in Japanese Unexamined Patent Publication No. 62-238003 "Shadow Mask Material and Manufacturing Method Thereof", a dull-processed roll is polished and the surface is optimized by using this roll, that is, Ra 0.2 μm
Although there is a proposal to set Rsk to 0 or more at 2.0 μm to 2.0 μm, the comparative example of the present invention is −0.1 ≦ Rsk ≦ −0.2.
However, in the embodiment, Rsk is +0.2.
I'm just saying. In the case of the Fe-Ni-based Invar alloy, adhesion seizure cannot be sufficiently prevented with this level of Rsk.

[0004]

The above-mentioned conventional techniques merely prevent the sticking seizure during annealing of the low carbon steel flat mask. The strength of the above-mentioned Fe-Ni alloy Invar alloy is higher than that of the low carbon steel, and therefore the annealing temperature before press forming is inevitably higher than that of the low carbon steel. Technology cannot prevent seizure during annealing of Invar alloy flat mask. In fact, the surface roughness Ra that can be reached by this conventional technique is 0.65 μm and Rsk is +0.2.
In the Invar alloy of No. 3, the adhesion sticking was remarkable at the time of annealing.

Therefore, the problem to be solved by the present invention is to provide a thin plate for an Fe-Ni-based shadow mask and a thin plate for a Fe-Ni-based shadow mask having a suitable plate surface roughness in the manufacturing method thereof. An object of the present invention is to provide a method that can be manufactured simply and stably at a relatively low cost.

[0006]

Means for solving the above-mentioned problems are as follows. The surface roughness of a steel sheet is 0.3 μm ≦ Ra ≦ 0.8.
Fe-N with μm and 3.0 ≦ Rku ≦ 7.0
It is a thin plate for an i-based shadow mask.

The surface roughness of the rolling work roll is 0.6 μm.
50 kg / m of a pair of upper and lower work rolls dulled in the range of m ≦ Ra ≦ 1.6 μm and 2.0 ≦ Rku ≦ 5.0
m ² ≦ Hertz stress ≦ 150 kg / mm ² The rolls are brought into contact with each other with a maximum contact stress between the rolls and rolled for 1000 to 10000 rotations, and then the rolls are used to roll a steel plate to obtain a surface roughness It is a method for manufacturing a thin plate for a Fe-Ni-based shadow mask.

[0008]

The operation of the present invention will be described below. The surface roughness of a low thermal expansion Fe—Ni-based steel sheet used as a shadow mask to prevent color shift due to the recent high quality of color television is 0.3 μm ≦ Ra and 3.0 ≦. Rk
By setting u, it is possible to properly prevent the adhesion sticking during annealing after etching. Also, the upper limit of Ra is 0.8
By setting the thickness to μm, the etching is properly performed,
Further, by setting the upper limit of Rku to 7.0, it is possible to prevent the occurrence of etching unevenness, and to avoid the occurrence of local adhesion due to stress concentration of the plate protrusion due to excessive Rku.

0.6 μm ≦ Ra ≦ 1.6 μm and 2.0
By using a roll dull-processed to ≦ Rku ≦ 5.0, Ra after rolling treatment is properly maintained, and the roll pattern is appropriately changed, so that the plate roughness after rolling is 0.3 μm.
≦ Ra ≦ 0.8 μm, and 3.0 ≦ Rku ≦ 7.
A value of 0 prevents seizure during flat mask annealing.

Formed by dulling by contacting the rolls dulled to the surface roughness specified in the present invention with maximum contact stress between rolls of Hertz stress of 50 kg / mm ² or more and rotating them. It is possible to appropriately remove the large and smooth convex portions and form sharper irregularities on the rolls between the convex portions to obtain an effective processing result. By setting the Rku value of the roll before rolling to 2.0 to 5.0, the Rku value of the roll after rolling can be properly secured. In addition, by setting the Hertzian stress to 150 kg / mm ² or less, it is possible to prevent the occurrence of a contact mark, that is, a touch mark generated by the roll contact.

Further, by setting the rolling speed to 1000 revolutions or more, it is possible to preferably remove large and smooth convex portions by dull processing, and to form sharper irregularities on the rolls between the convex portions, and the upper limit is set. By setting the rolling number to 10,000, it is possible to avoid an increase in rolling fatigue of the roll and deterioration due to the rolling fatigue, and obtain efficient processing. Industrially, it is less effective if rotated further. The Hertz stress is a value obtained by the following equation (1), and Rku is a value obtained by the following equation (2).

[0012]

[Equation 1]

[0013]

[Equation 2]

[0014]

EXAMPLES Specific embodiments of the present invention as described above will be described below. The present inventors have found that 36% Ni-F
A thin plate for a shadow mask made of an e-alloy was manufactured in which Ra and Rku of the plate roughness after rolling were variously changed, and the presence or absence of adhesion burning when the flat mask after etching was annealed and at the time of etching. The presence or absence of non-uniformity was examined. At this time, the annealing condition is 1
It was carried out continuously at 000 ° C. for 60 minutes. The results are shown in Table 1.
Shown in.

[0015]

[Table 1]

That is, Ra of A satisfies the requirements of the present invention, but Rku is low, and that of H and I does not satisfy Rku. R of K and L is Rku.
Satisfies the requirements of the present invention, but Ra does not reach the present invention. In all cases, the occurrence of seizure after annealing is recognized. For these, C, D,
All of E, F, G, and J had Ra and Rku within the scope of the present invention, and none of them could detect seizure and uneven etching after annealing. In addition, in the case of B and K to N,
Either or both of Rku and Ra are outside the scope of the present invention, and either or both of burn-in and uneven etching are recognized.

Next, using the roll according to the present invention, according to the rolling schedule shown in Table 2 below, the above 36% Ni-
The shadow mask was rolled with an Fe alloy.

[0018]

[Table 2]

The plate roughness obtained by this rolling is shown in Table 3 together with the roll roughness. 1 according to the invention
The roll rolled by 600 rotations has Ra of 0.65 μm, but Rku shows a high value of 6.5, which is excellent in etching property and adhesion preventive effect during annealing after etching. It was confirmed that there is.

[0020]

[Table 3]

FIG. 1 shows the relationship between the number of times of rolling and the roughness of the roll in one example of shot blasting of the roll in the present invention. The roll diameter used in the test is 120 mm and the material is equivalent to SKD. The same figure shows the influence of the number of times of rolling and the Hertz stress between the rolls on the roughness of the rolls, and it has been revealed that the influences are as follows.

First, when the Hertzian stress is 100 kg / mm ² , the roll wear is stable after 1000 rotations. That is, the large and smooth convex portions of the roll are sufficiently removed, and sharp irregularities are stably generated by the rolls of the convex portions, so that the Rku of the rolled material is improved. Second, roll wear does not proceed at a Hertzian stress of 30 kg / mm ² . Thirdly, at a Hertzian stress of 50 kg / mm ² , it converges about 1200 times.

Next, Table 4 shows the conditions for shot blasting of rolls, the roll roughness after rolling, the number of rolls and the plate roughness after rolling. No. 1 and 2 are comparative examples, N
o. 3 to 7 show those according to the conditions of the present invention.
The Hertz stress between rolls during rolling is 100 kg / mm.
^{Is 2} .

[0024]

[Table 4]

The rolling schedule of Table 4 is shown in Table 5 below.

[0026]

[Table 5]

[0027]

As described above, according to the present invention, the steel plate surface roughness of the shadow mask is 0.3 μm ≦ Ra.
By setting ≦ 0.8 μm and 3.0 ≦ Rku ≦ 7.0, adhesion sticking during etching annealing can be appropriately prevented. Moreover, a thin plate for a shadow mask having such characteristics can be easily and accurately manufactured, and as a result, a shadow mask which is favorable in terms of quality can be obtained at low cost.
Further, it is possible to improve the yield, and it is easy to roll the roll, and it is possible to obtain a shadow mask from these points as well. It is a possible invention.

[Brief description of drawings]

FIG. 1 shows the relationship between the rolling frequency and roll roughness for an example of shot blasting of a roll according to the present invention.

Claims (2)

[Claims] 1. The surface roughness of a steel sheet is 0.3 μm ≦ Ra ≦
A thin plate for a Fe—Ni-based shadow mask, which has a thickness of 0.8 μm and 3.0 ≦ Rku ≦ 7.0. 2. The surface roughness of a rolling work roll is 0.6 μm ≦
50 kg / mm ^{2 of a} pair of upper and lower work rolls dull-processed in the range of Ra ≦ 1.6 μm and 2.0 ≦ Rku ≦ 5.0
^2. The surface roughness of the steel sheet according to claim 1, wherein the steel sheet is rolled using this roll after being brought into contact with each other at a maximum contact stress between rolls in a range of ≦ Hertz stress ≦ 150 kg / mm ² and rolling 1000 to 10,000 revolutions. F characterized by gaining
A method for manufacturing a thin plate for an e-Ni-based shadow mask.