JP2842022B2 - Thin plate for Fe-Ni-based shadow mask and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003] 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 with the high quality of color televisions, use a conventional low carbon steel shadow mask. The annealing temperature of the flat mask after etching is higher than that of the mask material, and the sticking seizure is remarkable. However, no preferable proposal has been made to solve this problem.

That is, as in Japanese Patent Application Laid-Open No. Sho 62-238003, “Material for shadow mask and method for producing the same”, a dulled roll is polished, and the roll is used to optimize the surface, that is, Ra ( Center line average roughness) is 0.
Although there is a proposal to set Rsk (skewness) to be 0 or more from 2 μm to 2.0 μm, the comparative example of the present invention shows that −0.1 ≦
Rsk ≦ −0.2, whereas in the present embodiment, Rsk
Is set to +0.2. In the case of an Fe-Ni-based invar alloy, this level of Rsk cannot sufficiently prevent adhesion seizure.

In roll polishing, it is difficult to ensure uniformity in the roll width direction. In the case of an Fe-Ni-based invar alloy, even if Rsk can be increased to +0.5 or more according to the present invention. In addition, local adhesion cannot be prevented due to unevenness of roughness. Also, in Japanese Patent Application Laid-Open No. Hei 2-25201, "Metal plate for shadow mask and manufacturing method thereof", 0.2 μm
It has been proposed that Rsk be -0.2 or more when .ltoreq.Ra.ltoreq.2.0 .mu.m, but this still cannot prevent the annealing adhesion 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. The strength of the above-mentioned Invar alloy, which is an Fe-Ni alloy, is higher than that of low-carbon steel, and therefore, the annealing temperature before press forming must be taken higher than that of low-carbon steel. The technique cannot prevent seizure during annealing of an Invar alloy flat mask. In fact, in the case of the Invar alloy having a surface roughness Ra of 0.65 μm and an Rsk of +0.2 achieved by the prior art, adhesion seizure was remarkable during annealing.

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

[0008]

Means for solving the above problem is to solve the above problem by setting the surface roughness of the steel sheet to 0.3 μm ≦ Ra ≦ 0.8 μm.
And + 0.5 ≦ Rsk ≦ + 1.2, and 50 μm ≦
This is a thin plate for an Fe-Ni-based shadow mask in which Sm (average peak interval) ≦ 150 μm.

Further, the surface roughness of the rolling work roll is set to 0.6 μm.
≦ Ra ≦ 1.6 μm and 50 μm ≦ Sm ≦ 150
μm, and a pair of upper and lower work rolls dulled to a range of −0.4 ≦ Rsk ≦ + 0.4 are contacted with a stress in a range of 50 kg / mm ² ≦ Hertz stress (Pmax) ≦ 150 kg / mm ² , and
This is a method for producing a thin plate for a Fe-Ni-based shadow mask, in which the steel plate is rolled using the rolls after rolling from 000 to 10000 rotations, and the surface roughness of the steel plate is set as described above.

[0010]

The operation of the present invention will be described below. The surface roughness of a low thermal expansion Fe-Ni steel sheet used as a shadow mask to prevent color misregistration due to recent high-quality color televisions is 0.3 μm ≦ Ra and + 0.5 ≦ Rsk By doing so, a convex portion of an appropriate size is generated on the plate, the substantial contact area between the plates during pre-press annealing performed by laminating flat masks is reduced, and adhesion seizure is appropriately prevented. Further, by appropriately setting the upper limit of Ra to 0.8 μm, the etching is appropriately performed, and the upper limit of Rsk is set to +1.
By setting the value to 2, it is possible to prevent the occurrence of unevenness in etching and to prevent the image sticking from easily occurring again due to excessive etching.

Further, 150 μm ≧ Sm ≧ 50 μm,
By using a roll dulled to 0.6 μm ≤ Ra ≤ 1.6 μm and -0.4 ≤ Rsk ≤ +0.4, Ra after rolling is properly maintained, and the depth of the roll recess is properly ensured. The sheet roughness after rolling is set to 0.3 μm ≦ Ra ≦ 0.8 μm, and
+ 0.5 ≦ Rsk ≦ + 1.2 and 50 ≦ Sm ≦ 150μ
m prevents image sticking during flat mask annealing.

The roll dulled to +0.4 <Rsk is
Even after the rolling process, the surface of the steel sheet does not have sufficient roughness to make Rsk +0.5 or more. Further, dulling to Rsk <−0.4 is possible by laser dulling or the like, but in this case, when rolling is performed using a roll that has been subjected to rolling treatment, Rsk on the steel sheet surface becomes +1.3 or more. Etching unevenness is likely to occur, which is inappropriate.

The rolls dulled to the surface roughness specified in the present invention are brought into contact with each other at a stress of 50 kg / mm ² or more by Hertz stress to rotate and roll, so that the convex portions formed by dulling are formed. Proper removal can provide an effective processing result. And this hertz stress is 150kg
/ Mm ² or less prevents contact marks generated by roll contact, that is, touch marks. Further, the dulling convex portion is preferably removed by setting the rolling rotation speed to 1000 rotations or more, and the upper limit thereof is set to 10000 rotations, thereby avoiding an increase in the rolling fatigue of the roll and the deterioration due to the increase. Processing can be obtained. In addition, even if it rotates more than industrially, there is little effect.

As described above, the convex portion due to the dulling process is substantially eliminated, and the roll surface mainly composed of the concave portion is formed, so that the thin plate having many convex portions by the shadow mask rolling by this roll, that is, 0.3 μm ≦ Ra A thin plate having a high Rsk value of ≦ 0.8 μm can be accurately obtained.

Further, by setting the range of 50 μm ≦ Sm ≦ 150 μm, the number of dull protrusions per unit area is properly maintained, and local seizure is prevented. When Sm ≧ 150 μm, the number of protrusions per unit area becomes too small, and the load applied to each protrusion becomes excessive during annealing before press performed by laminating flat masks, causing local adhesion. Conversely, if 50 μm ≧ Sm, the number of protrusions per unit area becomes excessive, the contact area on the steel sheet surface increases, and local seizure also occurs.

The dulling of the roll as described above in the present invention may be performed by any of a grindstone, a laser beam, shot blasting, electric discharge machining, and the like, but is preferably performed by electric discharge machining or shot blasting with little directionality and regularity. It is appropriate that the shot blasting is employed in all of the examples described later. Here, the Hertz stress (Pmax) is a value obtained by the following equation (1), and Rsk is a value obtained by the following equation (2).

[0017]

(Equation 1)

[0018]

(Equation 2)

[0019]

EXAMPLES Specific embodiments of the present invention as described above will be described below. The present inventors have manufactured a thin plate for a shadow mask made of a 36% Ni-Fe alloy in which the plate roughness Ra, Rsk, and Sm after rolling are variously changed, and used the flat mask after the etching. The presence or absence of occurrence of sticking seizure during annealing and the occurrence of unevenness during etching were examined. At this time, the annealing condition is 1
The reaction was carried out at 050 ° C. for 60 minutes. Table 1 shows the results.
The following summarizes the surface roughness of a thin plate for a shadow mask and the adhesion after annealing.

[0020]

[Table 1]

That is, Ra of A satisfies the requirements of the present invention but Rsk is low and Sm is large, and those of H and I do not satisfy Rsk.
In the case of L, Rsk and Sm satisfy the requirements of the present invention, but Ra does not reach the present invention.
In each case, seizure occurs after annealing.

On the other hand, in the case of C, D, F, G, and J, Ra, Rsk, and Sm are all within the scope of the present invention. And uneven etching could not be recognized.
On the other hand, E and O are cases where Sm is smaller or larger than that of the present invention, and a part of image sticking occurs, and etching unevenness is slightly inferior to that of the present invention. Incidentally, in the case of B and K to N, Rsk and Ra, S
At least one of m is outside the scope of the present invention, and one or both of image sticking and uneven etching are observed.

Next, an embodiment relating to a manufacturing method for obtaining the above-mentioned thin plate for a shadow mask will be described. 36%
In order to obtain the above-mentioned thin plate with Ni-Fe alloy, it is necessary to use 1.2 μm Ra
The extent to dull worked between rolls Hertzian stress P _max to the upper and lower pair of rolls: while allowed to act 100 kg / mm ^2, 800 times, performing 1600 times and 5000 times of rolling.

Using the roll obtained as described above and the roll as shot blast, the shadow mask was rolled with the 36% Ni-Fe alloy according to the rolling schedule shown in Table 2 below.

[0025]

[Table 2]

The plate roughness obtained by this rolling is shown in Table 3 below together with the roll roughness. According to the present invention, the material rolled by the rolls rotated 1600 times and 5000 times has Ra of 0.65 μm, but Rsk of +1.
It shows a high value of 0, which is excellent in the etching property and the adhesion preventing effect at the time of annealing after etching.

[0027]

[Table 3]

FIG. 1 shows the relationship between the number of times of rolling and the roughness of the roll in an example of the present invention by shot blasting of the roll. The roll diameter used in the test was 120 mm, and the material was equivalent to SKD. This figure shows the effect of the number of rollings and the Hertzian stress between the rolls on the roll roughness, and the following was found.

First, when the Hertz stress is 100 kg / mm ² , the abrasion of the roll is stabilized at 1,000 revolutions. That is, the convex portion of the roll is sufficiently removed, and the Rsk of the rolled material is improved.
^Second , roll abrasion does not progress at a Hertz stress of 30 kg / mm ² . Third, at a Hertzian stress of 50 kg / mm ² , the convergence occurs at about 1200 times.

Table 4 below shows the conditions of the shot blast dulling of the roll, the roll roughness after rolling, the number of rolling times, and the plate roughness after rolling. Nos. 1 and 2 are comparative examples, and No. 3
To 7 show the results under the conditions of the present invention. No. 8
In Nos. 9 and 9, the roll roughness after dulling is out of the present invention. The Hertzian stress between rolls during rolling was 100 kg / mm.
²

[0031]

[Table 4]

The rolling schedule of Table 4 is shown in Table 5 together with the presence or absence of seizure during annealing.

[0033]

[Table 5]

That is, it is understood that only the product according to the present invention has no adhesion after annealing and is a good product.

[0035]

As described above, according to the present invention, the surface roughness of the steel plate of the shadow mask is set to 0.3 μm ≦ Ra ≦
By setting the thickness to 0.8 μm, and further to + 0.5 ≦ Rsk ≦ + 1.2 and 50 μm ≦ Sm ≦ 150 μm, adhesion seizure during etching annealing can be appropriately prevented. Further, a thin plate for a shadow mask having such characteristics can be easily and accurately manufactured, and as a result, a shadow mask having favorable quality can be obtained at low cost.

Further, the yield can be improved,
In addition, the rolling process with respect to the roll is very easy, and from these points, the shadow mask can be advantageously obtained, and the invention is industrially significant.

[Brief description of the drawings]

FIG. 1 is a chart showing the relationship between the number of times of rolling and the roughness of a roll in one example of roll blasting according to the present invention.

────────────────────────────────────────────────── ─── Continuation of the front page (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. The steel sheet has a surface roughness of 0.3 μm ≦ Ra ≦ 0.8.
μm and + 0.5 ≦ Rsk ≦ + 1.2, 50 μm ≦
A thin plate for an Fe-Ni-based shadow mask, wherein Sm ≦ 150 μm. 2. The rolling work roll has a surface roughness of 0.6 μm ≦ R.
a ≦ 1.6 μm and 50 μm ≦ Sm ≦ 150 μm
And a pair of upper and lower work rolls dulled in the range of -0.4≤Rsk≤ + 0.4 is 50 kg / mm ² ≤Hertz stress≤1
Contact with stress in the range of 50 kg / mm ² , 1000 to 1
A method for producing a thin plate for a Fe-Ni-based shadow mask, characterized in that the steel plate is rolled using this roll after rolling 0000 rotations to obtain the surface roughness of the steel plate according to claim 1.