JPH07210B2 - Shade mask molding method - Google Patents
Shade mask molding methodInfo
- Publication number
- JPH07210B2 JPH07210B2 JP58182678A JP18267883A JPH07210B2 JP H07210 B2 JPH07210 B2 JP H07210B2 JP 58182678 A JP58182678 A JP 58182678A JP 18267883 A JP18267883 A JP 18267883A JP H07210 B2 JPH07210 B2 JP H07210B2
- Authority
- JP
- Japan
- Prior art keywords
- die
- forming
- main surface
- mask
- shadow mask
- 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.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
【発明の詳細な説明】 〔発明の技術分野〕 この発明は、シヤドウマスクの成形方法に関する。Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for forming a shear mask.
一般にカラー受像管においては、パネルの内側に第１図
に示すようなシヤドウマスクを設けているが、このシヤ
ドウマスクの曲面は、通常、20インチ級で約800R程度の
ほぼ球面に設計されている。Generally, in a color picture tube, a sheer dough mask as shown in FIG. 1 is provided on the inner side of the panel. The curved surface of the sheer dough mask is usually designed to be a substantially spherical surface of about 800R in a 20-inch class.
このようなシヤドウマスクは、第２図（ａ）〜（ｄ）に
示す工程により、ブランクホルダー１、ダイ２、ポンチ
３、ノツクアウト４からなる金型を用いて成形される。
即ち、先ず（ａ）に示すように、多数の透孔を有する実
質的に矩形状の主面とこの主面に延在する周縁部とから
なるフラツトマスク金属薄板５の上記周縁部をブランク
ホルダー１とダイ２で挾持する。Such a sheer dough mask is molded by using the mold including the blank holder 1, the die 2, the punch 3, and the knockout 4 by the steps shown in FIGS. 2 (a) to 2 (d).
That is, first, as shown in (a), the above-mentioned peripheral portion of the flat mask metal thin plate 5 consisting of a substantially rectangular main surface having a large number of through holes and a peripheral portion extending to this main surface is attached to the blank holder 1. And hold with Die 2.
次に（ｂ）に示すように、ポンチ３を降下して、上記主
面をポンチ３とノツクアウト４により所定の曲面状に張
出成形する。Next, as shown in (b), the punch 3 is lowered and the main surface is bulged by the punch 3 and the knockout 4 into a predetermined curved surface.
次に（ｃ）及び（ｄ）に示すように、ポンチ３をダイ２
の中へ突き出して周縁部をダイ２とポンチ４の間のクリ
アランスに沿つて引き込み、周縁部を主面の曲面状延長
方向とは異なる方向へ成形して、スカート部を形成す
る。Next, as shown in (c) and (d), the punch 3 is attached to the die 2
And the peripheral edge portion is drawn along the clearance between the die 2 and the punch 4, and the peripheral edge portion is formed in a direction different from the curved extension direction of the main surface to form a skirt portion.
ところで、上記のように設計されたシヤドウマスクの成
形時の理論的加工率は、第３図（ａ），（ｂ）に示すよ
うに弦から弧の延びにより（Ｌ′−Ｌ）/Lで求められる
が、この値は通常１％以下となつている。この程度のご
く低い加工率の場合、第４図に示す応力−歪線上で弾性
限界ｂをやや越える程度しか加工することができない。
このような浅い加工の場合、加工硬化が少なく、シヤド
ウマスクの曲面の形状凍結性が極めて悪い。By the way, the theoretical processing rate at the time of molding the sheer dough mask designed as described above is calculated by (L'-L) / L by the arc extension from the chord as shown in FIGS. 3 (a) and 3 (b). However, this value is usually 1% or less. In the case of a working rate as low as this level, the working can be carried out only to the extent that the elastic limit b is slightly exceeded on the stress-strain line shown in FIG.
In the case of such shallow processing, there is little work hardening, and the shape fixability of the curved surface of the shear mask is extremely poor.
そこで、この加工率を上げるために、従来から第５図に
示すようにプレス型のダイ２とノツクアウト４に段差を
付け、シヤドウマスクの曲面張出し時の加工率を第３図
（ｃ），（ｄ）に示すように弦Ｌの分で孤Ｌ′と段差分
（ｌ＋ｌ）を形成し、加工率が１％を越えるようにして
いる。尚、第５図中の６は位置決め用凸部、７は位置決
め用凹部である。Therefore, in order to increase the processing rate, the press type die 2 and the knockout 4 are conventionally provided with a step as shown in FIG. 5, and the processing rate when the curved surface of the shadow mask is extended is shown in FIGS. ), The arc L'and the step (l + l) are formed by the portion of the string L so that the processing rate exceeds 1%. In FIG. 5, 6 is a positioning convex portion and 7 is a positioning concave portion.
ところが近年、デイスプレー画像の正確さ（ゆがみのな
さ）が、より求められるに伴い、カラー受像管のデイス
プレー面がよりフラツトに、従つてシヤドウマスク曲面
もよりフラツトになる傾向にある。このようなフラツト
なシヤドウマスクの曲面形状は、カラー受像管設計の上
で第６図（ａ）のような球面に近い形から第６図（ｂ）
のようななだらかな同心楕円等高線を持つ形状などに設
計される場合がある。However, in recent years, as the accuracy (no distortion) of the display image is required more, the display surface of the color picture tube tends to be more flat, and accordingly, the curved surface of the shadow mask tends to be more flat. The curved surface shape of such a flat sheer mask is from a shape close to a spherical surface as shown in FIG. 6 (a) in the design of a color picture tube, and FIG.
It may be designed in a shape having a gentle concentric ellipse contour line such as.
そのような形状のシヤドウマスクにおける第１図に示す
Ａ−Ａ′,B−Ｂ′,a−ａ′,b−ｂ′の断面の半径は、そ
れぞれ極めて異なり、例えば21インチ級のフラツトなデ
イスクプレーカラー受像管でＡ−Ａ′は1100R、Ｂ−
Ｂ′は1800Rなどとなる。Ａ−Ａ′の理論加工率は0.5
％、Ｂ−Ｂ′の理論加工率は第４図のａの弾性域にしか
達しないことになる。The radii of the cross sections of AA ', BB', aa ', and bb' shown in FIG. 1 in the shado mask having such a shape are very different from each other, for example, a 21-inch class flat disk spray. Color picture tube A-A 'is 1100R, B-
B'is 1800R and so on. The theoretical machining rate of A-A 'is 0.5
%, The theoretical working rate of B-B 'reaches only the elastic region of a in FIG.
これを避けるために、第５図のノツクアウト段差ｌを従
来の型のように均一に増加させた場合、Ｂ−Ｂ′部は第
４図のａ→ｃに理論加工率が増加するが、Ａ−Ａ′部は
ｃ→ｅとなり破断してしまう。In order to avoid this, when the knockout step l in FIG. 5 is increased uniformly as in the conventional mold, the theoretical machining rate increases from A to C in FIG. -A 'part becomes c → e and breaks.
この発明の目的は、孔延びや破断を生じることなく、良
好な曲面形状が得られるシヤドウマスクの成形方法を提
供することである。An object of the present invention is to provide a molding method for a sheer dough mask that can obtain a good curved surface shape without causing hole extension or breakage.
この発明は、多数の透孔を有する実質的に矩形状の主面
とこの主面に延在する周縁部とからなるフラットマスク
金属薄板の周縁部をブランクホルダーとダイで挾持し主
面をポンチとノックアウトにより所定の曲面状に張出成
形する工程と、ポンチをダイの中へ突き出して周縁部を
ダイとポンチの間のクリアランスに沿って引き込み周縁
部を主面の曲面状延長方向とは異なる方向へ成形してス
カート部を形成する工程とからなるシャドウマスクの成
形方法において、張出成形時のダイとノックアウトの段
差を、コーナー部と長・短辺中央部で変化させたプレス
金型により成形するシャドウマスクの成形方法である。According to the present invention, a peripheral portion of a flat mask metal thin plate composed of a substantially rectangular main surface having a large number of through holes and a peripheral portion extending to the main surface is held by a blank holder and a die, and the main surface is punched. Different from the process of bulging and forming into a predetermined curved surface by knocking out and punching the punch into the die and drawing the peripheral edge along the clearance between the die and the punch and the peripheral edge to the curved surface extending direction of the main surface. In the method of forming a shadow mask, which comprises the step of forming the skirt part by forming in the direction, the step difference between the die and the knockout at the time of bulging is made by a press die that changes the corner part and the center of the long and short sides. It is a method of forming a shadow mask to be formed.
又、この発明は、多数の透孔を有する実質的に矩形状の
主面とこの主面に延在する周縁部とからなるフラットマ
スク金属薄板の周縁部をブランクホルダーとダイで挾持
し主面をポンチとノックアウトにより所定の曲面状に張
出成形する工程と、ポンチをダイの中へ突き出して周縁
部をダイとポンチの間のクリアランスに沿って引き込み
周縁部を主面の曲面状延長方向とは異なる方向へ成形し
てスカート部を形成する工程とからなるシャドウマスク
の成形方法において、張出成形時のダイとノックアウト
の段差を、長辺の中央部と短辺の中央部で変化させたプ
レス金型により成形するシャドウマスクの成形方法であ
る。Further, according to the present invention, a peripheral portion of a flat mask metal thin plate consisting of a substantially rectangular main surface having a large number of through holes and a peripheral portion extending to the main surface is held by a blank holder and a die to hold the main surface. By punching and punching out into a predetermined curved surface shape, projecting the punch into the die and drawing the peripheral edge along the clearance between the die and the punch, and extending the peripheral edge with the curved surface extending direction of the main surface. In the method of forming a shadow mask, which comprises forming in different directions to form a skirt, the step between the die and the knockout during bulging is changed between the center of the long side and the center of the short side. It is a method of forming a shadow mask which is formed by a press die.
この発明のシヤドウマスク成形方法も、従来と同様に第
２図に示したような各工程を経て行なわれる。但し、こ
の発明では、上記従来の欠点を解消し、孔延びや破断す
ることなく良好な曲面形状を得るために、ダイの曲面が
ノツクアウトの曲面と異なり、球面張出時のダイとノツ
クアウトの段差が、シヤドウマスクのコーナー部と長短
辺中央部で、もしくは長辺側と短辺側で異なるように設
定されている。The shadow mask forming method of the present invention is also performed through the steps shown in FIG. 2 as in the conventional case. However, in the present invention, in order to eliminate the above-mentioned conventional defects and obtain a favorable curved surface shape without extending or breaking the hole, the curved surface of the die is different from the knockout curved surface, and the step between the die and the knockout at the time of spherical protrusion. However, it is set so as to be different between the corner portion and the central portion of the long and short sides, or the long side and the short side of the shear mask.
即ち、この発明で用いるダイ８は第７図（ａ）に示すよ
うに構成され、シヤドウマスクの設計に合わせ、各部の
加工率が均一になるようにノツクアウト４とダイ８の段
差がｌ−ｌ′のように変化させた形状にダイ８を形成す
る。このような金型の設計では、ノツクアウト４はポン
チ（第２図参照）に合わせる必要から、シヤドウマスク
の設計通りに製作し、ダイ８の方を所定の段差ｌ−ｌ′
が得られるような曲面に製作すればよい。That is, the die 8 used in the present invention is constructed as shown in FIG. 7 (a), and the step difference between the knockout 4 and the die 8 is l-l 'so as to make the processing rate of each part uniform according to the design of the shadow mask. The die 8 is formed in the changed shape as described above. In such a mold design, since the knockout 4 needs to be fitted to the punch (see FIG. 2), the knockout 4 is manufactured according to the design of the sheer mask, and the die 8 has a predetermined step l-l '.
The curved surface may be obtained so that
又、シヤドウマスクの設計により、上記（ａ）とは逆に
シヤドウマスクの中心軸の方が加工率が小さい場合は、
ダイ９は第７図（ｂ）に示すような形状にすればよい。Further, due to the design of the sheer dough mask, when the processing rate of the central axis of the sheer dough mask is smaller than the above (a),
The die 9 may be shaped as shown in FIG. 7 (b).
尚、この発明のシヤドウマスク成形方法は、上記のダイ
8,9を用いる点以外は従来例（第２図）と同様ゆえ、詳
細な説明を省略する。In addition, the method for forming a shed mask of the present invention is
The details are omitted because it is the same as the conventional example (FIG. 2) except that 8 and 9 are used.
この発明によれば、張出成形時のダイとノツクアウトの
段差が、シヤドウマスクのコーナー部と長短辺中央部
で、もしくは長辺側と短辺側で異なる形状のダイ8,9を
用いているので、孔延びや破断を生じることなく、良好
な曲面形状が得られる。According to this invention, the step difference between the die and the knockout at the time of bulging is the use of the dies 8 and 9 having different shapes at the corner and the long and short sides of the shear mask, or at the long side and the short side. A good curved surface shape can be obtained without causing hole extension or breakage.
第１図はシヤドウマスクを示す斜視図、第２図（ａ）〜
（ｄ）は従来のシヤドウマスクの成形方法を示す工程説
明図、第３図（ａ）〜（ｄ）はシヤドウマスク成形時の
理論的加工率を示す金型及びシヤドウマスクの断面図、
第４図は応力と歪の関係を示す特性曲線図、第５図は従
来の成形方法で用いている金型を示す断面図、第６図
（ａ），（ｂ）はシヤドウマスクの曲面形状の例を示す
平面図、第７図（ａ），（ｂ）はこの発明の一実施例に
係るシヤドウマスクの成形方法で用いる金型（ダイ及び
ノツクアウト）の２例を示す斜視図である。 ４……ノツクアウト、8,9……ダイ。FIG. 1 is a perspective view showing a shear mask, and FIG.
FIG. 3D is a process explanatory view showing a conventional method for forming a shed mask, FIGS. 3A to 3D are sectional views of a mold and a shed mask showing a theoretical processing rate at the time of forming a shed mask,
FIG. 4 is a characteristic curve diagram showing the relationship between stress and strain, FIG. 5 is a cross-sectional view showing a mold used in a conventional molding method, and FIGS. 6 (a) and 6 (b) are curved surface shapes of the shear mask. FIGS. 7 (a) and 7 (b) are perspective views showing two examples of a mold (die and knockout) used in the method for forming a sheer mask according to one embodiment of the present invention. 4 ... Knockout, 8,9 ... Die.
Claims (2)
と前記主面に延在する周縁部とからなるフラットマスク
金属薄板の前記周縁部をブランクホルダーとダイで挾持
し前記主面をポンチとノックアウトにより所定の曲面状
に張出成形する工程と、前記ポンチを前記ダイの中へ突
き出して前記周縁部を前記ダイと前記ポンチの間のクリ
アランスに沿って引き込み前記周縁部を前記主面の曲面
状延長方向とは異なる方向へ成形してスカート部を形成
する工程とからなるシャドウマスクの成形方法におい
て、 前記張出成形時の前記ダイと前記ノックアウトの段差
を、コーナー部と長・短辺中央部で変化させたプレス金
型により成形することを特徴とするシャドウマスクの成
形方法。1. A flat mask metal thin plate comprising a substantially rectangular main surface having a large number of through holes and a peripheral portion extending to the main surface, the peripheral portion being held by a blank holder and a die. A step of forming a surface into a predetermined curved surface by punching and knocking out, and a step of projecting the punch into the die and pulling the peripheral edge portion along the clearance between the die and the punch to draw the peripheral edge portion. In the method of forming a shadow mask, which comprises a step of forming a skirt portion by forming it in a direction different from the curved surface extension direction of the main surface, a step between the die and the knockout at the time of the bulging formation is defined by a corner portion and a long portion. A method for forming a shadow mask, which is characterized in that the shadow mask is formed by changing the press die at the center of the short side.
と前記主面に延在する周縁部とからなるフラットマスク
金属薄板の前記周縁部をブランクホルダーとダイで挾持
し前記主面をポンチとノックアウトにより所定の曲面状
に張出成形する工程と、前記ポンチを前記ダイの中へ突
き出して前記周縁部を前記ダイと前記ポンチの間のクリ
アランスに沿って引き込み前記周縁部を前記主面の曲面
状延長方向とは異なる方向へ成形してスカート部を形成
する工程とからなるシャドウマスクの成形方法におい
て、 前記張出成形時の前記ダイと前記ノックアウトの段差
を、長辺の中央部と短辺の中央部で変化させたプレス金
型により成形することを特徴とするシャドウマスクの成
形方法。2. A flat mask metal thin plate comprising a substantially rectangular main surface having a large number of through holes and a peripheral portion extending to the main surface, the peripheral portion being held by a blank holder and a die. A step of forming a surface into a predetermined curved surface by punching and knocking out, and a step of projecting the punch into the die and pulling the peripheral edge portion along the clearance between the die and the punch to draw the peripheral edge portion. In a method of forming a shadow mask, which comprises a step of forming a skirt portion by forming in a direction different from a curved surface extension direction of a main surface, a step between the die and the knockout at the time of the bulging forming is defined by a center of a long side. A method for forming a shadow mask, characterized in that the shadow mask is formed by a press die that is changed at the central portion of each portion and the short side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58182678A JPH07210B2 (en) | 1983-09-30 | 1983-09-30 | Shade mask molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58182678A JPH07210B2 (en) | 1983-09-30 | 1983-09-30 | Shade mask molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6076226A JPS6076226A (en) | 1985-04-30 |
| JPH07210B2 true JPH07210B2 (en) | 1995-01-11 |
Family
ID=16122516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58182678A Expired - Lifetime JPH07210B2 (en) | 1983-09-30 | 1983-09-30 | Shade mask molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07210B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2505028B2 (en) * | 1988-05-17 | 1996-06-05 | 三菱電機株式会社 | Shadow mask molding equipment |
-
1983
- 1983-09-30 JP JP58182678A patent/JPH07210B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6076226A (en) | 1985-04-30 |
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