JPS62104627A - Production of shadow mask - Google Patents

Production of shadow mask

Info

Publication number
JPS62104627A
JPS62104627A JP60244342A JP24434285A JPS62104627A JP S62104627 A JPS62104627 A JP S62104627A JP 60244342 A JP60244342 A JP 60244342A JP 24434285 A JP24434285 A JP 24434285A JP S62104627 A JPS62104627 A JP S62104627A
Authority
JP
Japan
Prior art keywords
shadow mask
forming
springback
molding
moment
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.)
Granted
Application number
JP60244342A
Other languages
Japanese (ja)
Other versions
JPH0240402B2 (en
Inventor
Tatsuya Adachi
達也 足立
Yoshimichi Hori
堀 義道
Takayuki Sato
隆行 佐藤
Masanori Igaki
井垣 正則
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP60244342A priority Critical patent/JPS62104627A/en
Publication of JPS62104627A publication Critical patent/JPS62104627A/en
Publication of JPH0240402B2 publication Critical patent/JPH0240402B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

PURPOSE:To prevent the reduction in the curved face accuracy due to a springback and to obtain the shadow mask of high accuracy by setting the forming temp. at each part so that the parts more than two places of a blank may show the springback value in a different direction after forming while under forming. CONSTITUTION:The springback in a different direction happens respectively on the 1st forming part 15 and 2nd forming part 16 when a thin metallic blank is press-formed by a metal die 11. And moment Ma works after the press forming and the curved surface accuracy is reduced. Now, the temp. at the 2nd forming part 16 is set higher than the temp. of the 1st forming part 15 by utilizing that the springback value becomes smaller than the temp. in forming in order to work the reverse moment Mb. The reduction in the surface accuracy of the shadow mask is then checked by working the reverse moment Mb against the moment Ma.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明はカラー受像管用シャドウマスクの製造方法に係
り、特にそのプレス成形方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a shadow mask for a color picture tube, and particularly to a press molding method thereof.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

一般に、カラー受鍮管用シャドウマスク1は第1図およ
び第2図で示すように金属薄板に規則的に配列された多
数の透孔を有する曲面状部からなる主面2とその周縁の
スカート部3とから構成されている。そして、このシャ
ドウマスク1は蛍光面の形成されたパネル内面と所定間
隔をもって近接対向して支持される。また、このシャド
ウマスク1はたとえば特開昭60−61122号公報に
示されているように金属薄板に所定の透孔を穿設した後
、実質的に矩形状の主面に延在する周縁部分から主面2
の曲面状延長方向とは異なる方向にその周縁部をスカー
ト部3としてプレス成形される。
In general, a shadow mask 1 for a collar brass pipe consists of a main surface 2 consisting of a curved section having a large number of regularly arranged through holes in a thin metal plate, and a skirt section around the main surface 2, as shown in FIGS. 1 and 2. It is composed of 3. This shadow mask 1 is supported so as to be closely opposed to the inner surface of the panel on which the phosphor screen is formed, with a predetermined distance therebetween. Further, as shown in, for example, Japanese Patent Application Laid-Open No. 60-61122, this shadow mask 1 is manufactured by forming a predetermined through hole in a thin metal plate, and then forming a peripheral portion extending over a substantially rectangular main surface. From main surface 2
It is press-molded in a direction different from the direction in which the curved surface extends, with its peripheral edge forming the skirt part 3.

一方、このシャドウマスクの素材は低熱膨張の材料たる
、たとえばアンバー合金が用いられている。ところが、
このような素材は充分な焼鈍処理を行なってもその降伏
点強度はきわめて大きい。
On the other hand, the material used for this shadow mask is a material with low thermal expansion, such as an amber alloy. However,
Even if such a material is sufficiently annealed, its yield point strength is extremely high.

したがって、これを金型を用いて成形した場合。Therefore, if this is molded using a mold.

その成形後にスプリングバックが生じての周縁部のスカ
ート部との間付近における成形部のスプリングバックに
より第3図a で示すようにMaなるモーメントが働き
、主面の曲面精度は低下する。
After the molding, springback occurs in the molded part near the peripheral edge and the skirt part, and as a result, a moment Ma acts as shown in FIG.

そこで、特開昭59−200721号公報で示されるよ
うに温間プレス成形をすることにより降伏点強度を低下
させ、より変形のないシャドウマスクを製造する方法も
提供されている。
Therefore, as shown in Japanese Unexamined Patent Publication No. 59-200721, a method of manufacturing a shadow mask with less deformation by lowering the yield point strength by performing warm press molding has been proposed.

しかしながら、この方法によっても成形部のスプリング
バックにより第3図a で示すようなMaなるモーメン
トが依然として残り、これにより主面の曲面精度の低下
は完全に阻止し得ない。
However, even with this method, a moment Ma as shown in FIG. 3a still remains due to the springback of the molded part, and as a result, the deterioration of the curved surface accuracy of the main surface cannot be completely prevented.

〔発明の目的〕[Purpose of the invention]

本発明は上記事情にもとづいてなされたもので。 The present invention has been made based on the above circumstances.

その目的とするところは素材各部の成形形状にそれぞれ
適した成形温度を設定して成形し、スプリングバックに
よるシャドウマスク主面の曲面精度の低下を阻止するこ
とができるシャドウマスクの製造方法を提供することに
ある。
The purpose is to provide a method for manufacturing a shadow mask that can prevent deterioration of the curved surface accuracy of the main surface of the shadow mask due to springback by setting a molding temperature suitable for each part of the material to be molded. There is a particular thing.

〔発明の概要〕[Summary of the invention]

鉄およびニッケルを主成分とする薄い金属板を1間成形
によりシャドウマスクを製造する方法において、成形中
、その素材の2か所以上の部位が成形後異なる向きのス
プリングバック値を示すようにその各部位の成形湿度を
設定するシャドウマスクの製造方法である。
In a method of manufacturing a shadow mask by one-time molding of a thin metal plate mainly composed of iron and nickel, the material is molded during molding so that two or more parts of the material exhibit springback values in different directions after molding. This is a shadow mask manufacturing method that sets the molding humidity of each part.

〔発明の実施例〕[Embodiments of the invention]

以下1本発明の一実施例を説明する。第5図はこの実施
例に使用する金型11の構造を示す。この金型11はダ
イ12.パンチ13.ノックアウト14からなり、第1
図および第2図で示すようなシャドウマスク1をプレス
成形するものである。
An embodiment of the present invention will be described below. FIG. 5 shows the structure of the mold 11 used in this embodiment. This mold 11 is a die 12. Punch 13. Consisting of 14 knockouts, the first
A shadow mask 1 as shown in the figures and FIG. 2 is press-molded.

第4図はこれにより成形したシャドウマスク1の周縁部
分を示す。
FIG. 4 shows the peripheral portion of the shadow mask 1 thus formed.

そして、このプレス成形時において第5図で示す第1の
成形部15と第2の成形部16との成形i度を異ならせ
る。つまり、第1の成形部15よりも第2の成形部16
の成形温度を高くする。この場合、SaW度を200℃
(成形有効温度の範囲内)までとする。より具体的には
 70℃〜150℃の範囲内とするのが望ましい。
During this press molding, the degree of molding of the first molded part 15 and the second molded part 16 shown in FIG. 5 is made different. In other words, the second molding section 16 is larger than the first molding section 15.
Increase the molding temperature. In this case, the SaW degree is 200℃
(within the effective molding temperature range). More specifically, the temperature is preferably within the range of 70°C to 150°C.

このように金型11に温度差をつける方法としてはその
金型11の部品であるダイ12.バンチ13、ノックア
ウト14に熱源17.・・・をそれぞれ配設し、その熱
源17.・・・の各温度T 1. T°2〜T5を適宜
設定する。
A method of creating a temperature difference in the mold 11 in this way is to apply a temperature difference to the die 12, which is a component of the mold 11. Bunch 13, knockout 14, heat source 17. ... are arranged respectively, and their heat sources 17. Each temperature T 1. Set T°2 to T5 appropriately.

しかして、上記金型11によりプレス成形した場合、第
1の成形部15と第2の成形部16にはそれぞれ異なる
向きのスプリングバックが起きる。
Therefore, when press molding is performed using the mold 11, springback occurs in the first molded part 15 and the second molded part 16 in different directions.

第1の成形部15においてはΔθ1のスプリングバック
が生じる。また、第2の成形部16においてはC)2−
92のスプリングバックが生じる。
In the first molded portion 15, a springback of Δθ1 occurs. Furthermore, in the second molding section 16, C)2-
92 springback occurs.

ところで、プレス成形後のスプリングバックにより第3
図(a>で示すようにM aなるモーメントが働き1曲
面精度は低下する。そこで、第3図(b)で示すように
Mbなる逆のモーメントを動かせる。そして、このMb
なるモーメントを働かせるためには、第1の成形部15
において生じるスプリングバックΔe1よりも第2の成
形部16において生じるスブリ〉・グバックθ2−e2
を小さくすることによりΔθ2を生じさせるとよい。
By the way, due to springback after press forming, the third
As shown in Figure 3 (a), a moment M a acts and the accuracy of one curved surface decreases.Therefore, as shown in Figure 3 (b), an opposite moment Mb can be applied.
In order to exert a moment of
The springback θ2−e2 occurring in the second molded part 16 is greater than the springback Δe1 occurring in
It is preferable to generate Δθ2 by reducing Δθ2.

そして、この手段として前述したようにプレス成形時に
おいて第1の成形部15よりも第2の成形部16の成形
温度を高くするのである。すなわち、素材の温度特性に
より成形時の温度によりそのスプリングバック値は小さ
くなることを利用して第6図で示すように第1の成形部
15の温度T1よりも第2の成形部16の温度T2を高
く設定することにより第2の成形部16におけるスプリ
ングバック値SB2  (θ2−θ2に相当)を小さく
する。したがって、プレス成形後のスプリングバックに
より第3図(a)で示すようなMaなるモーメントに対
して第3図(b)で示すようにMbなる逆のモーメント
を働かせることによりシャドウマスク1の曲面精度を保
つことができるのである。
As a means for this purpose, the molding temperature of the second molding part 16 is made higher than that of the first molding part 15 during press molding, as described above. That is, by utilizing the fact that the springback value decreases depending on the temperature during molding due to the temperature characteristics of the material, the temperature of the second molding part 16 is lower than the temperature T1 of the first molding part 15, as shown in FIG. By setting T2 high, the springback value SB2 (corresponding to θ2 - θ2) in the second molded portion 16 is made small. Therefore, the curved surface accuracy of the shadow mask 1 is improved by applying an opposite moment Mb as shown in FIG. 3(b) to the moment Ma shown in FIG. 3(a) due to springback after press forming. can be maintained.

〔発明の効果〕〔Effect of the invention〕

以上説明したような本発明方法によれば、スプリングバ
ックによるシャドウマスク曲面精度の低下がなく、高精
度のシャドウマスクを提供することができる。また9本
発明方法の確立により真空処理でないと得られなかった
低耐力成形を温間成形により可能とし、大幅なコストダ
ウンを達成できる。
According to the method of the present invention as described above, there is no reduction in the accuracy of the shadow mask curved surface due to springback, and a highly accurate shadow mask can be provided. Furthermore, with the establishment of the method of the present invention, low stress forming, which could not be obtained without vacuum processing, can be achieved by warm forming, and a significant cost reduction can be achieved.

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

@1図はシャドウマスクの正面図、第2図は同じくその
シャドウマスクの平断面図、第3図(a)、(b)はス
プリングバックによりシャドウマスクに加わるモーメン
トの説明図、第4図はシャドウマスクに生じるスプリン
グバックの説明図、第5図は金型の構造説明図、第6図
はシブドウマスク素材の応力ひずみ線図である。 11・・・金型、15・・・第1の成形部、16・・・
第2の成形部、17・・・熱源。 出願人代理人 弁理士 鈴江武彦 第1図 、1 第2図 第3図      第4図
@ Figure 1 is a front view of the shadow mask, Figure 2 is a plan cross-sectional view of the same shadow mask, Figures 3 (a) and (b) are explanatory diagrams of the moment applied to the shadow mask due to springback, and Figure 4 is an illustration of the moment applied to the shadow mask due to springback. FIG. 5 is an explanatory diagram of the springback that occurs in the shadow mask, FIG. 5 is an explanatory diagram of the structure of the mold, and FIG. 6 is a stress strain diagram of the shadow mask material. 11... Mold, 15... First molding section, 16...
Second molding section, 17... heat source. Applicant's representative Patent attorney Takehiko Suzue Figure 1, 1 Figure 2 Figure 3 Figure 4

Claims (1)

【特許請求の範囲】 1 鉄およびニッケルを主成分とする薄い金属板を温間
成形によりシャドウマスクを製造する方法において、成
形中、その素材の2か所以上の部位が成形後異なる向き
のスプリングバック値を示すようにその各部位の成形温
度を設定することを特徴とするシャドウマスクの製造方
法。 2 上記各部位の成形温度を設定するため、プレス金型
の成形部に温度差を設けたことを特徴とするシャドウマ
スクの製造方法。
[Claims] 1. In a method of manufacturing a shadow mask by warm forming a thin metal plate mainly composed of iron and nickel, during forming, two or more parts of the material have springs in different orientations after forming. A method for manufacturing a shadow mask, characterized in that the molding temperature of each part of the shadow mask is set so as to indicate a back value. 2. A method for manufacturing a shadow mask, characterized in that a temperature difference is provided in the molding part of the press mold in order to set the molding temperature of each part.
JP60244342A 1985-10-31 1985-10-31 Production of shadow mask Granted JPS62104627A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60244342A JPS62104627A (en) 1985-10-31 1985-10-31 Production of shadow mask

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60244342A JPS62104627A (en) 1985-10-31 1985-10-31 Production of shadow mask

Publications (2)

Publication Number Publication Date
JPS62104627A true JPS62104627A (en) 1987-05-15
JPH0240402B2 JPH0240402B2 (en) 1990-09-11

Family

ID=17117277

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60244342A Granted JPS62104627A (en) 1985-10-31 1985-10-31 Production of shadow mask

Country Status (1)

Country Link
JP (1) JPS62104627A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59150623A (en) * 1983-02-18 1984-08-28 Sumitomo Metal Ind Ltd Press forming device
JPS59200721A (en) * 1983-04-27 1984-11-14 Toshiba Corp Manufacture of shadow mask

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59150623A (en) * 1983-02-18 1984-08-28 Sumitomo Metal Ind Ltd Press forming device
JPS59200721A (en) * 1983-04-27 1984-11-14 Toshiba Corp Manufacture of shadow mask

Also Published As

Publication number Publication date
JPH0240402B2 (en) 1990-09-11

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