JPH09249943A - Iron-nickel alloy for electronic gun parts good in punchability and worked part - Google Patents

Iron-nickel alloy for electronic gun parts good in punchability and worked part

Info

Publication number
JPH09249943A
JPH09249943A JP8453596A JP8453596A JPH09249943A JP H09249943 A JPH09249943 A JP H09249943A JP 8453596 A JP8453596 A JP 8453596A JP 8453596 A JP8453596 A JP 8453596A JP H09249943 A JPH09249943 A JP H09249943A
Authority
JP
Japan
Prior art keywords
inclusions
sulfide
etching
alloy
punchability
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8453596A
Other languages
Japanese (ja)
Inventor
Masazumi Mori
正澄 森
Yoshihiro Koseki
義浩 小関
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikko Kinzoku KK
Original Assignee
Nikko Kinzoku KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nikko Kinzoku KK filed Critical Nikko Kinzoku KK
Priority to JP8453596A priority Critical patent/JPH09249943A/en
Publication of JPH09249943A publication Critical patent/JPH09249943A/en
Pending legal-status Critical Current

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  • ing And Chemical Polishing (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

PROBLEM TO BE SOLVED: To produce an alloy for electronic gun parts, particularly, for an electronic gun electrode good in punchability and free from reduction in the service life of a die and the increase of the cost caused by the addition of special elements, in an Fe-Ni alloy contg. a specified amt. of Ni, by regulating the number of sulfide inclusion flaws after etching to a specified range. SOLUTION: This alloy is composed of an Fe-NI alloy contg., by weight, 30 to 55% Ni, and the balance Fe, and in which the number of sulfide inclusion flaws after etching is regulated to 1000 to 2000 pieces/mm<2> , where the number of the sulfide inclusion flaws after etching denotes the number of inclusions obtd. by etching the face of the material to be ground in the rolling direction and in the cross section parallel to the sheet thickness in the material by a 0.3 to 0.7% nital soln., selectively corroding sulfide inclusions and measuring the number of corrosion flaws by an image analysis system. For example, at the time of punching fine pares 10a to 10c in electrode parts 10 of this alloy, the generation of burrs B in the tip edge 10e at which a punch cut off punching chips from the stock can be prevented.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、電子銃部品、例え
ば電子銃電極材料として好適な、プレス打ち抜き性を向
上させたFe−Ni系合金並びに該合金素材をプレス打
ち抜きすることにより加工し、該素材に電子ビームを通
過させる微小孔を穿設した電子銃プレス打ち抜き加工部
品、代表的に電子銃電極に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun part, for example, an electron gun electrode material, which is suitable for use as an electron gun electrode material. The present invention relates to an electron gun press-punched component, typically an electron gun electrode, in which a material is provided with minute holes for passing an electron beam.

【0002】[0002]

【従来の技術】図1は、公知のシャドウマスク型カラー
ブラウン管の断面図であって、パネル1に赤、緑、青の
3原色を発光する蛍光膜2が塗布されており、一方ネッ
ク部には電子ビーム3を発射する電子銃4が備えられて
いる。電子ビーム3は偏向ヨーク5により偏向走査され
る。6はシャドウマスク、そして7は磁気シールドであ
る。
2. Description of the Related Art FIG. 1 is a cross-sectional view of a known shadow mask type color cathode ray tube, in which a panel 1 is coated with a phosphor film 2 for emitting three primary colors of red, green and blue, while a neck portion is provided. Is provided with an electron gun 4 for emitting an electron beam 3. The electron beam 3 is deflected and scanned by the deflection yoke 5. 6 is a shadow mask, and 7 is a magnetic shield.

【0003】図2(a)及び(b)は、電子銃4に装備
される打ち抜き加工部品の一例としての電極10を示す
斜視図及び断面図である。電極10は電子銃の陰極から
放出された熱電子を加速させる役目を成す。電極10に
はそれぞれ赤、緑及び青発色用ビームを通過させる微小
孔10a、10b及び10cをコイニングとプレス打ち
抜き加工により形成している。
FIGS. 2 (a) and 2 (b) are a perspective view and a sectional view showing an electrode 10 as an example of a punched component mounted on the electron gun 4. FIG. The electrode 10 serves to accelerate thermoelectrons emitted from the cathode of the electron gun. Microelectrodes 10a, 10b and 10c for passing red, green and blue light-emitting beams are formed in the electrode 10 by coining and press punching.

【0004】一般に、TV受像管等に用いられる電子銃
部品は、板厚0.05〜0.5mm程度の非磁性ステン
レス鋼であるFe−Cr−Ni系合金を上述のようにコ
イニングを経てあるいは経ずにプレス打ち抜き加工する
ことにより完成させる。しかし、最近は、電子銃の陰極
から放出された熱電子を加速させる電極10には、非磁
性の指標である透磁率が1に近いことよりもむしろ、ガ
ラス封着を行うこと、あるいは使用時の熱膨張による色
づれの防止を行うために、封着ガラスと熱膨張係数が近
似していること、あるいは熱膨張係数が低いことが重視
されるようになっている。
Generally, an electron gun component used in a TV picture tube or the like is made of a Fe-Cr-Ni alloy which is a non-magnetic stainless steel having a plate thickness of about 0.05 to 0.5 mm, after being coined as described above. Completed by press punching without passing through. However, recently, the electrode 10 for accelerating thermoelectrons emitted from the cathode of an electron gun is glass-sealed or used during use rather than having a magnetic permeability, which is a nonmagnetic index, close to 1. In order to prevent the color shift due to the thermal expansion, the importance is attached to the sealing glass having a similar thermal expansion coefficient or a low thermal expansion coefficient.

【0005】そこで、低熱膨張特性を持つFe−Ni系
合金、特にFe−42%Ni合金(42合金)が電子銃
部品用材料として用いられはじめたが、従来の42合金
は靭性が高いことから、電極部品に微小孔10a、10
b及び10cをプレス打ち抜き加工する際、ポンチが素
材から打ち抜きカスを切り放す先端縁10e(図2参
照)にバリBが発生しやすく、また金型磨耗量が大き
い。
Therefore, an Fe-Ni alloy having a low thermal expansion property, particularly an Fe-42% Ni alloy (42 alloy) has begun to be used as a material for electron gun parts, but the conventional 42 alloy has high toughness. , Micro holes 10a, 10 in the electrode parts
When press-punching b and 10c, burrs B are likely to occur on the leading edge 10e (see FIG. 2) where the punch cuts out punched scraps from the material, and the amount of die wear is large.

【0006】打ち抜き加工時に発生するバリは、安定し
た品質と高精度、高温、高電圧に対する耐久性を必要と
する電子銃部品の部品特性に悪影響を与え、最悪の場
合、致命的欠陥となる場合がある。例えば、高電圧によ
る微少なバリからの異常放電による電子銃の耐電圧の低
下といった問題が挙げられる。
Burrs generated during punching adversely affect the component characteristics of electron gun components that require stable quality and high precision, durability against high temperatures and high voltages, and in the worst case, fatal defects. There is. For example, there is a problem that the withstand voltage of the electron gun is lowered due to abnormal discharge from a minute burr due to high voltage.

【0007】また、近年のブラウン管の大画面、高品質
化に伴い、電子銃部品にプレス打ち抜き加工によって開
ける孔径は、板厚と同等またはそれ以下と微細になり、
従来では問題とならなかった、孔周辺部に発生する微小
なバリも問題となってきているため、電子銃部品に発生
するバリ低減への要求はますます厳しくなっている。さ
らに、生産性向上のためプレス打ち抜き時の金型磨耗量
が少なく金型寿命の長い材料が求められている。
In addition, with the recent increase in screen size and quality of cathode ray tubes, the hole diameter formed by press punching in electron gun parts becomes as fine as or smaller than the plate thickness.
Since minute burrs around the hole, which has not been a problem in the past, has become a problem, the demand for reducing burrs generated in electron gun parts is becoming more and more severe. Further, in order to improve productivity, there is a demand for a material that has a small amount of die wear during press punching and has a long die life.

【0008】従来から、Fe−Ni系合金の打ち抜き性
を改善するための提案が、特開平6−122945号、
特開平6−184703号、特開平7−3400号、特
開平7−34199号等でなされている。その中で、特
開平6−122945号では、S含有量を0.002〜
0.05%に規定し、SまたはS化合物を粒界又は粒内
に分散することが提案されているが、打ち抜き性を向上
させるのは硫化物系介在物であり、単に快削性元素であ
るSの含有量を規定するだけでは、最近の極めて精密な
プレス加工でのバリ抑制に十分とはいえない。
Conventionally, a proposal for improving the punchability of Fe-Ni alloys has been disclosed in JP-A-6-122945,
It is made in JP-A-6-184703, JP-A-7-3400, JP-A-7-34199 and the like. Among them, in JP-A-6-122945, the S content is 0.002-
Although it has been proposed to specify S to be 0.05% and to disperse S or an S compound in the grain boundaries or within the grains, it is the sulfide inclusions that improve the punchability, and it is simply a free-cutting element. It is not enough to limit the burr in the recent extremely precise press working just by defining the content of S.

【0009】次に、特開平6−184703号、特開平
7−3400号、特開平7−34199号等では、T
i、Nb、V、Ta、W、Zr等の強度向上元素を添加
し、硬さの上昇と適度の脆化によりバリ発生を押さえよ
うとする提案がなされているが、硬さ上昇による金型寿
命の低下や特殊元素添加によるコストアップの問題を抱
えている。
Next, in JP-A-6-184703, JP-A-7-3400 and JP-A-7-34199, T
It has been proposed to add strength improving elements such as i, Nb, V, Ta, W, and Zr to suppress the occurrence of burrs by increasing hardness and moderate embrittlement. It has problems of reduced life and increased cost due to addition of special elements.

【0010】[0010]

【発明が解決しようとする課題】本発明は、上記従来技
術の問題点を解消し、打ち抜き性を改善し、しかも金型
寿命の低下や特殊元素添加によるコストアップの問題を
排除した電子銃部品用Fe−Ni系合金並びに電子銃プ
レス打ち抜き加工部品を提供することを課題とするもの
である。
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, improves punchability, and eliminates the problems of reduced die life and increased cost due to the addition of special elements. It is an object of the present invention to provide a Fe-Ni alloy for use in an electronic gun and an electron gun press-punched part.

【0011】[0011]

【課題を解決するための手段】本発明者等は、プレス打
ち抜き性に及ぼす材料因子について研究を重ねた結果、
適正個数の硫化物系介在物が打ち抜き性を向上させるの
に、極めて有効であることをここに確認し、特開平6−
122945号で提唱されたような単に材料中の硫黄濃
度をコントロールするのではなく、打ち抜き性を向上さ
せる硫化物系介在物自体の個数を直接規定することによ
って、電子銃用Fe−Ni系合金のプレス打ち抜き性を
改善することができることを見いだした。金型寿命の低
下や特殊元素添加によるコストアップの問題も生じな
い。打ち抜き性に影響を及ぼすと考えられる微小な硫化
物系介在物は材料の圧延方向に平行な断面を研磨しただ
けでは検出することが困難であるので、材料の研磨面を
0.3〜0.7%ナイタル液(0.3〜0.7%硝酸−
エタノール溶液)、最適には0.5%ナイタル液でエッ
チングし、硫化物系介在物を選択的に腐食させ、その腐
食痕の数を画像解析装置にて測定し介在物個数とする。
Means for Solving the Problems As a result of repeated studies on material factors affecting press punchability, the present inventors have found that
It was confirmed here that an appropriate number of sulfide-based inclusions are extremely effective in improving punchability, and JP-A-6-
No. 122945 proposes not only controlling the sulfur concentration in the material, but directly defining the number of sulfide-based inclusions themselves that improve the punching property. It has been found that the press punchability can be improved. There is no problem of shortening the mold life and cost increase due to the addition of special elements. Since it is difficult to detect the minute sulfide inclusions which are considered to affect the punching property only by polishing the section parallel to the rolling direction of the material, the polished surface of the material is 0.3 to 0. 7% Nital solution (0.3-0.7% nitric acid-
Etching with an ethanol solution), optimally a 0.5% nital solution, selectively corrodes sulfide-based inclusions, and the number of corrosion traces is measured by an image analyzer to obtain the number of inclusions.

【0012】この知見に基づいて、本発明は、重量パー
セントでNiを30〜55%含み、残部Fe及び不可避
的不純物からなるFe−Ni系合金において、材料の圧
延方向及び板厚に平行な断面における、材料の研磨面を
0.3〜0.7%ナイタル液でエッチングし、硫化物系
介在物を選択的に腐食させ、その腐食痕の数を画像解析
装置にて測定した介在物個数として定義する、エッチン
グ後の硫化物系介在物痕の個数が1000〜2000個
/mm2 であることを特徴とする、打ち抜き性の良好
な、電子銃部品用Fe−Ni系合並びに該合金から作製
された電子銃プレス打ち抜き加工部品、特に電子銃電極
を提供するものである。
Based on this finding, the present invention provides a Fe--Ni alloy containing 30 to 55% by weight of Ni and the balance Fe and unavoidable impurities in a cross section parallel to the rolling direction and plate thickness of the material. In, the polished surface of the material was etched with 0.3 to 0.7% nital solution to selectively corrode the sulfide-based inclusions, and the number of corrosion traces was determined as the number of inclusions measured by an image analyzer. Produced from Fe-Ni alloys for electron gun parts having good punching properties and alloys thereof, characterized in that the number of sulfide-based inclusion marks after etching is 1000 to 2000 / mm 2. Electron gun press punched parts, in particular electron gun electrodes.

【0013】[0013]

【発明の実施の形態】本発明と関与する電子銃部品用F
e−Ni系合金は、重量パーセントでNiを30〜55
%含み、残部はFe及び不可避的不純物からなる。Ni
はFe−Ni系合金の熱膨張特性を決定する重要な元素
であり、30%未満ではあるいは55%を超えると熱膨
張係数が大きくなりすぎ好ましくない。よって、Niの
成分範囲を30〜55%とする。不純物は、炭素、リ
ン、銅などの通常の不純物であって、膨張特性にとって
有害であるほか、それ自体ではプレス打ち抜き性には有
害であるが、P25 、Cu2 Sなど微細な非金属介在
物として存在してプレス打ち抜き性を改善する。これら
の不純物元素の量は通常総計で10〜2000ppm程
度であることが好ましい。
BEST MODE FOR CARRYING OUT THE INVENTION F for electron gun parts related to the present invention
The e-Ni based alloy contains 30 to 55% by weight of Ni.
% And the balance consists of Fe and inevitable impurities. Ni
Is an important element that determines the thermal expansion characteristics of the Fe-Ni alloy. If it is less than 30% or exceeds 55%, the coefficient of thermal expansion becomes too large, which is not preferable. Therefore, the range of the Ni component is set to 30 to 55%. Impurities are normal impurities such as carbon, phosphorus, and copper, which are harmful to the expansion characteristics and, in themselves, are harmful to the press punchability, but they are fine non-fine particles such as P 2 O 5 and Cu 2 S. It exists as a metal inclusion to improve press punchability. It is preferable that the total amount of these impurity elements is generally about 10 to 2000 ppm.

【0014】本発明に従えば、圧延方向及び板厚に平行
な断面におけるエッチング後の硫化物系介在物痕の個数
が1000〜2000個/mm2 に制御される。
According to the present invention, the number of sulfide-based inclusion marks after etching in the cross section parallel to the rolling direction and the plate thickness is controlled to 1000 to 2000 / mm 2 .

【0015】非金属介在物は、A系介在物、B系介在物
及びC系介在物に分類される(JIS G 0555
鋼の非金属介在物の顕微鏡試験方法による)。ここで、
A系介在物とは加工によって変形したものであり、硫化
物、珪酸塩などである。B系介在物は、加工方向に集団
をなして不連続的に粒状の介在物が並んだもので、アル
ミナなどの線状集団である。C系介在物は、粘性変形し
ないで不規則に分散するもので、酸化物、炭窒化物を含
み、A系、B系に比較して小さい。これら介在物は、材
料の研磨面を適当な濃度のナイタル液(硝酸−エタノー
ル溶液)でエッチングし、顕微鏡により観察することに
より識別することができる。A系介在物、B系介在物及
びC系介在物はFe−Ni系合金のプレス打ち抜き性に
それぞれ寄与することが判明している。
Non-metallic inclusions are classified into A type inclusions, B type inclusions and C type inclusions (JIS G 0555).
According to the microscopic examination method of non-metallic inclusions in steel). here,
The A-type inclusions are those that are deformed by processing, and are sulfides, silicates, and the like. The B-type inclusions are aggregates of granular inclusions arranged in a discontinuous manner in the processing direction, and are linear aggregates such as alumina. The C-based inclusions are irregularly dispersed without viscous deformation, include oxides and carbonitrides, and are smaller than the A-based and B-based inclusions. These inclusions can be identified by etching the polished surface of the material with a nital liquid (nitric acid-ethanol solution) having an appropriate concentration and observing with a microscope. It has been found that the A-based inclusions, the B-based inclusions, and the C-based inclusions each contribute to the press punchability of the Fe-Ni-based alloy.

【0016】本発明者等が行った電子銃部品用Fe−N
i系合金のプレス打ち抜き性に及ぼす介在物の影響に関
する研究によって、介在物のうちでも特に硫化物系介在
物の個数を適切な範囲に制御することによって打ち抜き
性良好な材料が得られることが明らかになった。Fe−
Ni系合金においては、A系介在物としては硫化物系介
在物が実質上すべてであり、これは、MnS系、FeS
系、NiS系或いはそれらの複合系介在物に代表される
硫黄化合物の総称である。硫化物系介在物は、そのB
系、C系とは異なった固有の形態及び大きさから材料の
研磨面を0.3〜0.7%ナイタル液(0.3〜0.7
%硝酸−エタノール溶液)、最適には0.5%ナイタル
液でエッチングし、画像解析装置により測定することに
よりその個数を数えることができる。エッチング液は、
0.5%ナイタル液でエッチングして識別できる硫化物
系介在物痕の個数と同等となる濃度範囲において使用す
ることができる。
Fe—N for electron gun parts conducted by the present inventors
A study on the influence of inclusions on the press punchability of i-based alloys revealed that a material with good punchability can be obtained by controlling the number of inclusions, especially sulfide inclusions, within an appropriate range. Became. Fe-
In Ni-based alloys, sulfide-based inclusions are virtually all of the A-based inclusions, which are MnS-based and FeS-based inclusions.
Is a general term for sulfur compounds represented by a system, NiS system, or their composite inclusions. The sulfide-based inclusion is B
The polishing surface of the material has a peculiar morphology and size different from those of the C-type and C-type, and the polishing surface of the material is 0.3 to 0.7% (0.3 to 0.7%).
% Nitric acid-ethanol solution), optimally 0.5% nital solution, and the number can be counted by measuring with an image analyzer. The etchant is
It can be used in a concentration range that is equivalent to the number of sulfide-based inclusion traces that can be identified by etching with a 0.5% nital solution.

【0017】この硫化物系介在物を適正量材料中に存在
させることによって打ち抜き性を向上させることができ
る。すなわち、打ち抜き時、せん断変形が進むに連れて
刃先近傍の応力が高くなり、ついには破壊が始まるわけ
であるが、この破壊は主に介在物を起点として起こるた
め、介在物の多い材料のほうが容易に破壊しやすく、結
果として破断面比率の高い、バリの小さなプレス破面が
得られるのである。介在物のうちでも硫化物系介在物が
特に打ち抜き性に大きな影響を及ぼしていることが判明
したものである。
The punching property can be improved by allowing an appropriate amount of this sulfide-based inclusion to exist in the material. That is, at the time of punching, the stress near the cutting edge increases as the shear deformation progresses, and finally the fracture begins, but since this fracture mainly originates from inclusions, the material with many inclusions is better. It is easy to break, and as a result, a press fracture surface with a high fracture surface ratio and a small burr can be obtained. Among the inclusions, it was found that the sulfide-based inclusions had a great influence on the punchability.

【0018】上記の通り、打ち抜き性に影響を及ぼすと
考えられる微小な硫化物系介在物は材料を研磨しただけ
では検出することが困難であるので、材料の研磨面を
0.3〜0.7%ナイタル液(0.3〜0.7%硝酸−
エタノール溶液)、最適には0.5%ナイタル液でエッ
チングし、硫化物系介在物を選択的に腐食させ、その腐
食痕の数を画像解析装置にて測定し、介在物個数とし
た。画像解析では、硫化物系介在物がB系、C系介在物
とは異なった固有の形態及び大きさを有することから、
硫化物系介在物のみを選択的に画像として表示すること
ができる。この手法によって、研磨上りでは検出されな
いような微小な硫化物系介在物の個数を含めた形で介在
物個数を評価することが可能となった。
As described above, it is difficult to detect the minute sulfide-based inclusions that are thought to affect the punchability by simply polishing the material. Therefore, the polished surface of the material is 0.3-0. 7% Nital solution (0.3-0.7% nitric acid-
Etching with an ethanol solution), optimally a 0.5% nital solution, selectively corrodes sulfide-based inclusions, and the number of corrosion traces was measured with an image analyzer to determine the number of inclusions. In the image analysis, since the sulfide-based inclusion has a unique morphology and size different from those of the B-based and C-based inclusions,
Only sulfide inclusions can be selectively displayed as an image. This method has made it possible to evaluate the number of inclusions including the number of minute sulfide-based inclusions that cannot be detected after polishing.

【0019】前述の手法によって測定したエッチング後
の硫化物系介在物痕の個数が1000個/mm2 以上に
なると、プレス打ち抜き性が向上することが明らかとな
った。しかし、2000個以上になると耐食性及び熱間
加工性を阻害するようになるので、エッチング後の硫化
物系介在物痕の数を1000〜2000個/mm2 とす
る。
It has been revealed that the press punchability is improved when the number of sulfide-based inclusion marks after etching measured by the above-mentioned method is 1000 pieces / mm 2 or more. However, if the number is 2000 or more, corrosion resistance and hot workability are impaired, so the number of sulfide-based inclusion marks after etching is set to 1000 to 2000 / mm 2 .

【0020】本発明の電子銃部品用Fe−Ni系合金
は、例えば下記のようにして製造される。まず、電磁気
材料用の鉄スクラップ等の鉄源、電解ニッケル等の主原
料を用意し、あらかじめそれらに含まれる硫化物系介在
物を測定しておく。その硫化物系介在物量が少ない場合
には、硫化ニッケル、硫化鉄、硫黄快削鋼、硫黄等を添
加する。硫化物系介在物が多い場合には、清浄度が高い
原料を混合する。こうして、上述した硫化物系介在物の
個数となるよう溶製したインゴットを均質化焼鈍後、熱
間鍛造または圧延を施し、冷間圧延と焼鈍を繰り返して
最終厚さとし、最終焼鈍して板厚0.05〜0.5mm
程度のプレス打ち抜き用素材に仕上げられる。電子銃部
品は、素材をコイニングを経てあるいは経ずにプレス打
ち抜き加工することにより完成させる。
The Fe-Ni alloy for electron gun parts of the present invention is manufactured, for example, as follows. First, an iron source such as an iron scrap for electromagnetic materials and a main raw material such as electrolytic nickel are prepared, and sulfide inclusions contained therein are measured in advance. When the amount of the sulfide-based inclusions is small, nickel sulfide, iron sulfide, sulfur free-cutting steel, sulfur, etc. are added. When there are many sulfide inclusions, the raw materials having high cleanliness are mixed. In this way, after homogenizing and annealing the ingot melted so as to have the number of the above-mentioned sulfide-based inclusions, hot forging or rolling is performed, and cold rolling and annealing are repeated to obtain the final thickness, and the final annealing is performed. 0.05-0.5 mm
It is finished into a material for press punching. The electron gun parts are completed by stamping the material with or without coining.

【0021】[0021]

【実施例】Niを36〜50重量%含んだFe−Ni系
合金を、真空度が10-5〜10-1Torrの範囲の誘導
型真空溶解炉により約6kgのインゴットに溶製した。
原料としては、高純度電解鉄、プレス加工用鋼板スクラ
ップ、硫黄快削鋼、リムド鋼スクラップ、電解ニッケ
ル、電解マンガン等を様々の割合で混合することにより
原料中に含まれる硫化物系介在物の量を変化させた。ま
た、Ni量は、ほぼ36〜50重量%の範囲で仕上げ
た。
Example An Fe-Ni alloy containing 36 to 50% by weight of Ni was melted into an ingot of about 6 kg by an induction type vacuum melting furnace having a vacuum degree in the range of 10 -5 to 10 -1 Torr.
As a raw material, high-purity electrolytic iron, steel plate scrap for press working, sulfur free-cutting steel, rimmed steel scrap, electrolytic nickel, electrolytic manganese, etc. are mixed in various proportions to form sulfide inclusions contained in the raw material. The amount was changed. Moreover, the amount of Ni was finished in the range of approximately 36 to 50% by weight.

【0022】各インゴットは、均質化焼鈍後1200℃
で熱間圧延し4mmの厚さの板にした。これを焼鈍し、
酸洗後、1.5mm厚に冷間圧延し、光輝焼鈍後0.4
mm板厚に冷間圧延した。次に、これを真空中にて75
0℃で1時間焼鈍し供試材とした。
Each ingot was heated to 1200 ° C. after homogenization annealing.
Was hot rolled into a plate having a thickness of 4 mm. Annealed this,
After pickling, cold rolling to 1.5mm thickness, bright annealing 0.4
It was cold rolled to a plate thickness of mm. Then, this is put in vacuum 75
It was annealed at 0 ° C for 1 hour to obtain a test material.

【0023】打ち抜き性の評価は、供試材に30トンプ
レスにより直径0.4mmの孔を3mm間隔で10個あ
け、その際に発生したバリの最大厚さ、最大高さ及び打
ち抜き面の破断面比率を求めた。また、5%塩水による
塩水噴霧試験を35℃で24時間行い、錆び発生を調べ
た。表1に本発明例及び比較例のNi量、エッチング後
の硫化物系介在物痕の個数、最大バリ厚さ、最大バリ高
さ、破断面比率及び塩水噴霧試験結果を示す。ここで、
バリ厚さとは、加工した孔をバリ側から観察した場合の
バリの孔外周からの距離(突出長さ)である。バリ高さ
とは、加工した孔を孔断面から観察した場合のバリの孔
下面からの距離(突出長さ)である。破断面比率(%)
とは、破断面面積/(せん断面面積+破断面面積)×1
00により定義される。
The punching property was evaluated by punching 10 holes with a diameter of 0.4 mm at intervals of 3 mm on the test material with a 30 ton press, and the maximum thickness and maximum height of the burr generated at that time and the breaking of the punched surface. The cross-sectional ratio was calculated. Further, a salt spray test with 5% salt water was carried out at 35 ° C. for 24 hours to examine the occurrence of rust. Table 1 shows the amounts of Ni, the number of sulfide-based inclusion marks after etching, the maximum burr thickness, the maximum burr height, the fracture surface ratio, and the salt spray test results of the inventive example and the comparative example. here,
The burr thickness is the distance (protrusion length) from the outer periphery of the burr when the processed hole is observed from the burr side. The burr height is the distance (projection length) from the bottom surface of the burr when the processed hole is observed from the hole cross section. Fracture surface ratio (%)
Is the fracture surface area / (shear surface area + fracture surface area) x 1
It is defined by 00.

【0024】[0024]

【表1】 [Table 1]

【0025】表1より明らかなように、本発明例はいず
れもエッチング後の硫化物介在物痕の少ない比較例N
o.7〜9に比べバリの最大厚さ及び高さが小さく、打
ち抜き加工時のバリ発生が著しく抑制されている。さら
に、比較例No.7〜9に比べ本発明例はいずれも破断
面比率が高く、打ち抜き性が向上している。また、比較
例No.10〜12は硫化物系介在物痕の個数が本発明
の範囲を超えているため塩水噴霧試験により錆が発生し
好ましくない。
As is clear from Table 1, in all the examples of the present invention, Comparative Example N has few traces of sulfide inclusions after etching.
o. The maximum thickness and height of burrs are smaller than those of Nos. 7 to 9, and the occurrence of burrs during punching is significantly suppressed. Further, in Comparative Example No. Compared with Nos. 7 to 9, in all the examples of the present invention, the fracture surface ratio was high and the punchability was improved. Also, in Comparative Example No. Nos. 10 to 12 are not preferable because the number of sulfide-based inclusion marks exceeds the range of the present invention and rust is generated by the salt spray test.

【0026】こうして、本発明は、電子銃部品用Fe−
Ni系合金の耐食性を劣化させることなく、最大バリ厚
さを20μm以下に、最大バリ高さを6μm以下にそし
て破断面比率を20%以上にすることができる。
Thus, the present invention is an Fe-type electron gun component.
The maximum burr thickness can be 20 μm or less, the maximum burr height can be 6 μm or less, and the fracture surface ratio can be 20% or more without deteriorating the corrosion resistance of the Ni-based alloy.

【0027】[0027]

【発明の効果】以上のように、プレス打ち抜き性を著し
く改善した本発明の電子銃部品用Fe−Ni系合金によ
れば、例えば、バリからの異常放電による耐電圧の低下
といった問題を解消し、寸法精度を高め、近年のブラウ
ン管の大型化、高品質化に対応できる優れた電子銃部品
を得ることができる。
As described above, according to the Fe-Ni alloy for electron gun parts of the present invention, which has remarkably improved press punchability, the problems such as a decrease in withstand voltage due to abnormal discharge from burrs can be solved. In addition, it is possible to obtain excellent electron gun parts which can improve the dimensional accuracy and can cope with the recent increase in size and quality of cathode ray tubes.

【図面の簡単な説明】[Brief description of drawings]

【図1】シャドウマスクブラウン管の断面図である。FIG. 1 is a sectional view of a shadow mask cathode ray tube.

【図2】電子銃打ち抜き加工部品一例を示し、(a)及
び(b)は、それぞれ斜視図、及びA−A’線に沿う断
面図である。
2A and 2B show an example of an electron gun punched component, and FIGS. 2A and 2B are a perspective view and a sectional view taken along the line AA ′, respectively.

【符号の説明】[Explanation of symbols]

1 パネル 2 蛍光膜 3 電子ビーム 4 電子銃 5 偏向ヨーク 6 シャドウマスク 10 電極 10a、10b、10c 微小孔 10e 先端縁 B バリ 1 panel 2 fluorescent film 3 electron beam 4 electron gun 5 deflection yoke 6 shadow mask 10 electrodes 10a, 10b, 10c small holes 10e tip edge B burr

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 重量パーセントでNiを30〜55%含
み、残部Fe及び不可避的不純物からなるFe−Ni系
合金にして、材料の圧延方向及び板厚に平行な断面にお
ける、材料の研磨面を0.3〜0.7%ナイタル液でエ
ッチングし、硫化物系介在物を選択的に腐食させ、その
腐食痕の数を画像解析装置にて測定した介在物個数とし
て定義する、エッチング後の硫化物系介在物痕の個数が
1000〜2000個/mm2 であることを特徴とす
る、打ち抜き性の良好な、電子銃部品用Fe−Ni系合
金。
1. A Fe-Ni-based alloy containing 30 to 55% by weight of Ni and the balance Fe and unavoidable impurities, and the polished surface of the material in a cross section parallel to the rolling direction and the plate thickness of the material. Sulfide after etching, which is defined as the number of inclusions measured by an image analyzer, by etching with a 0.3 to 0.7% nital solution to selectively corrode sulfide-based inclusions and selectively corroding the sulfide-based inclusions. Fe-Ni alloy for electron gun parts, which has good punchability and is characterized in that the number of object-based inclusion marks is 1000 to 2000 / mm 2 .
【請求項2】 重量パーセントでNiを30〜55%含
み、残部Fe及び不可避的不純物からなるFe−Ni系
合金にして、材料の圧延方向及び板厚に平行な断面にお
ける、材料の研磨面を0.3〜0.7%ナイタル液でエ
ッチングし、硫化物系介在物を選択的に腐食させ、その
腐食痕の数を画像解析装置にて測定した介在物個数とし
て定義する、エッチング後の硫化物系介在物痕の個数が
1000〜2000個/mm2 であることを特徴とする
Fe−Ni系合金製の電子銃プレス打ち抜き加工部品。
2. A polished surface of the material in a cross section parallel to the rolling direction and the plate thickness of the material, which is a Fe-Ni alloy containing 30 to 55% by weight of Ni and the balance Fe and unavoidable impurities. Sulfide after etching, which is defined as the number of inclusions measured by an image analyzer, by etching with a 0.3 to 0.7% nital solution to selectively corrode sulfide-based inclusions and selectively corroding the sulfide-based inclusions. An electron gun press-punched part made of an Fe-Ni alloy, characterized in that the number of marks of inclusions is 1000 to 2000 / mm 2 .
【請求項3】 重量パーセントでNiを30〜55%含
み、残部Fe及び不可避的不純物からなるFe−Ni系
合金にして、材料の圧延方向及び板厚に平行な断面にお
ける、材料の研磨面を0.3〜0.7%ナイタル液でエ
ッチングし、硫化物系介在物を選択的に腐食させ、その
腐食痕の数を画像解析装置にて測定した介在物個数とし
て定義する、エッチング後の硫化物系介在物痕の個数が
1000〜2000個/mm2 であることを特徴とする
Fe−Ni系合金を用いた電子銃電極。
3. A Fe—Ni-based alloy containing 30 to 55% by weight of Ni and the balance Fe and unavoidable impurities, and the polished surface of the material in a cross section parallel to the rolling direction and the plate thickness of the material. Sulfide after etching, which is defined as the number of inclusions measured by an image analyzer, by etching with a 0.3 to 0.7% nital solution to selectively corrode sulfide-based inclusions and selectively corroding the sulfide-based inclusions. An electron gun electrode using an Fe-Ni-based alloy, characterized in that the number of material-based inclusion marks is 1000 to 2000 / mm 2 .
JP8453596A 1996-03-14 1996-03-14 Iron-nickel alloy for electronic gun parts good in punchability and worked part Pending JPH09249943A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8453596A JPH09249943A (en) 1996-03-14 1996-03-14 Iron-nickel alloy for electronic gun parts good in punchability and worked part

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8453596A JPH09249943A (en) 1996-03-14 1996-03-14 Iron-nickel alloy for electronic gun parts good in punchability and worked part

Publications (1)

Publication Number Publication Date
JPH09249943A true JPH09249943A (en) 1997-09-22

Family

ID=13833344

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8453596A Pending JPH09249943A (en) 1996-03-14 1996-03-14 Iron-nickel alloy for electronic gun parts good in punchability and worked part

Country Status (1)

Country Link
JP (1) JPH09249943A (en)

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