JPS59104220A - Forming method of metallic plate - Google Patents
Forming method of metallic plateInfo
- Publication number
- JPS59104220A JPS59104220A JP57212658A JP21265882A JPS59104220A JP S59104220 A JPS59104220 A JP S59104220A JP 57212658 A JP57212658 A JP 57212658A JP 21265882 A JP21265882 A JP 21265882A JP S59104220 A JPS59104220 A JP S59104220A
- Authority
- JP
- Japan
- Prior art keywords
- curvature
- curved surface
- forming
- die
- rectangular frame
- 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
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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は金属板の成形方法、特に曲面状の成形方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of forming a metal plate, particularly a method of forming a curved surface.
実質的に矩形状の枠を有し、この矩形状の枠内に所定の
曲率を持たせるように金属板を成形する場合、一般に成
形金型によシ成形した際の曲面部の塑性変形によシ所望
する曲面を得る、いわゆる張シ出し成形によシ行なわれ
る。When a metal plate has a substantially rectangular frame and is formed to have a predetermined curvature within the rectangular frame, plastic deformation of the curved surface portion when molded using a molding die generally occurs. This is done by so-called stretch molding to obtain the desired curved surface.
しかし乍ら要求される曲面の曲率が小さいもの、即ちよ
シ平坦状のものや矩形枠が小爆いものでは成形時に曲面
部が塑性変形を起こす領域に達しない為、所望とする曲
面の成形が非常に困難となる。However, if the required curvature of the curved surface is small, that is, if the curvature is very flat or if the rectangular frame is small, the curved surface will not reach the region where plastic deformation occurs during molding, so it is difficult to form the desired curved surface. becomes extremely difficult.
このような仕様の曲面を得る為の成形法としては圧縮成
形法が有効である。しかし乍ら圧縮成形により成形され
た場合に於ても曲面の強度は弱く成形後に曲面が変形し
てしまう問題を有する。また矩形状の枠を形成するため
の折り曲げ部は絞り加工によって成形を行うが、この折
シ曲げ部を有する枠部分は枠内の曲面部に比して強度的
に大であるため圧縮成形後の変形は成形時に生じた伸び
を曲面部のみの変形によシ吸収することとなシ、結果と
して曲面部に変形が生じてしまうものと考えられる。Compression molding is an effective molding method for obtaining curved surfaces with such specifications. However, even when molded by compression molding, there is a problem that the strength of the curved surface is weak and the curved surface deforms after molding. In addition, the bent portions to form the rectangular frame are formed by drawing, but since the frame portion with the bent portions is stronger than the curved portion within the frame, it is It is thought that the deformation occurs because the elongation that occurs during molding is not absorbed by the deformation of only the curved surface portion, resulting in deformation of the curved surface portion.
このような曲面部の変形は第１図に示すように実線（２
）から点線（３）へと曲率が大きくなる方向へ変形する
。尚、第１図では１つの図面で実質的に矩形状の曲面部
の垂直軸曲率Ｒｖ、水平軸曲率ＲＨ及び対角軸曲率ＲＤ
をまとめて示し、当初成形金型ではＲｖｏ： Ｒ，）Ｉ
ｏ＝ ＦｔＤｏ で３軸同−であったものが変形後には
それぞれＲＶｌ 、”Ｈｌ及びＲＤｌに変形したことを
示している。第１図からも明らかなようにこの曲率の変
化は曲面部の中央（５）から枠部（１）の折り曲げ部（
４）までの距離によって異なっており、距離が短かい程
曲率の変化も大きいことを示している。即ち垂直軸の変
化が最も大きく、最終的に所定の曲率を有する曲面部を
得ることは極めて困難である。This kind of deformation of the curved surface part is caused by the solid line (2) as shown in Figure 1.
) to the dotted line (3) in the direction in which the curvature increases. In addition, in FIG. 1, the vertical axis curvature Rv, the horizontal axis curvature RH, and the diagonal axis curvature RD of a substantially rectangular curved surface part are shown in one drawing.
are collectively shown, and in the initial molding die Rvo: R,)I
This shows that the three axes that were the same as o = FtDo transformed into RVl, Hl and RDl after deformation.As is clear from Figure 1, this change in curvature occurs at the center of the curved part. (5) to the bent part of the frame (1) (
4), indicating that the shorter the distance, the greater the change in curvature. That is, the change in the vertical axis is the largest, and it is extremely difficult to finally obtain a curved surface portion having a predetermined curvature.
本発明は以上の点に鑑みてなされたもので、最終的に所
定の曲率を有する曲面部が得られる成形法を提供するこ
とを目的とする。The present invention has been made in view of the above points, and an object of the present invention is to provide a molding method that can finally obtain a curved surface portion having a predetermined curvature.
本発明は成形金型の曲面部の曲率が最終的に得られる所
定の曲率よ）も小さい金型を用いて圧縮成形し、且つ曲
面部の中央部から周端部までの距離が短かい軸はど最終
的に得られる所定の金属板の曲率に対する成形金型の曲
面部曲率の変化の比率が犬となるようにした圧縮成形に
よる金属板の成形方法である。The present invention performs compression molding using a mold in which the curvature of the curved surface of the mold is smaller than the predetermined curvature to be finally obtained, and the shaft has a short distance from the center of the curved surface to the peripheral end. This is a method of forming a metal plate by compression molding in which the ratio of the change in the curvature of the curved surface of the mold to the curvature of the finally obtained predetermined metal plate is equal to that of the metal plate.
以下に第２図及び第３図を参照して本発明の実施例につ
いて説明する。尚、第２図及び第３図共第２図と同様に
垂直軸（Ｒｖ）、水平軸（Ｒｎ）及び対角軸（ＲＤ）の
３軸を同一図面に重畳して示す。Embodiments of the present invention will be described below with reference to FIGS. 2 and 3. 2 and 3, the three axes of the vertical axis (Rv), horizontal axis (Rn), and diagonal axis (RD) are shown superimposed on the same drawing as in FIG. 2.
実施例として最終的に要求される曲面部の垂直軸曲率（
”ｖｏ） 、水平軸曲率（Ｒ１（。）及び対角軸曲率（
”ＤＯ）が全て同一、即ち３軸が全て同一の球面部を成
形する場合について説明する。As an example, the vertical axis curvature of the curved surface part (
”vo), horizontal axis curvature (R1(.) and diagonal axis curvature (.)
A case will be described in which a spherical part is molded in which all "DO" are the same, that is, all three axes are the same.
第２図はこの場合の成形金型の垂直軸曲率（Ｒｖｚ）、
水平軸曲率（”Ｒ２）及び対角軸曲率（％ｔ） ｋ示し
、２等３軸共最終的に要求される曲率よりも小さく、且
つ各軸で曲率が異なるようになっている。即ち各軸の曲
率は球面部中央（６）から折り曲げ部（力まで −の距
離が短かい程曲率が小さくなる形状とされている。つま
シ垂直軸曲率（Ｒｖｚ）が最も小さく、対角軸曲率（Ｒ
Ｄ２）が最も大きくなる、Ｒｙ、＜Ｒｎ２＜”Ｄｚなる
関係を有し、２等３軸の間は滑らかにつながるような形
状とされている。Figure 2 shows the vertical axis curvature (Rvz) of the molding die in this case,
The horizontal axis curvature (R2) and the diagonal axis curvature (%t) k are smaller than the final required curvature for all the second and third axes, and the curvature is different for each axis. The curvature of the axis is shaped such that the shorter the distance from the center of the spherical part (6) to the bending part (-), the smaller the curvature is. R
The shape has the relationship Ry,<Rn2<"Dz, in which D2) is the largest, and the three axes are smoothly connected to each other.
このような成形金型を用いて圧縮成形を行なった後の形
状は第３図に示すように、球面部の変形は点線で示す成
形金型の各軸の曲率が全体に大きくなる方向に変化し、
且つ中央部（６）から折り曲げ部（７）までの距離の短
かい軸はど変化し、しかも変化後の各軸面率が全て同一
となるように成形金型の各軸面率が予め選定されている
ので、所定の球面部が得られることになる。The shape after compression molding using such a molding die is shown in Figure 3, and the deformation of the spherical part changes in the direction in which the curvature of each axis of the molding die increases as a whole, as shown by the dotted line. death,
In addition, each axis area ratio of the molding die is selected in advance so that the axis with the shortest distance from the center part (6) to the bent part (7) changes, and the area ratio of each axis after the change is all the same. Therefore, a predetermined spherical portion can be obtained.
以上の実施例では３軸同−の球面部を成形する場合につ
いて説明したが、本発明は最終的に目的とする曲面部の
３軸の曲率が全て異なる場合、或は同一の軸で中央部か
ら周辺部へ曲率が変化する非球面の場合についても適用
できることは言うまでもない。また本発明の曲面部はよ
）曲率の小さいものや矩形枠形状の小さいもの或はよシ
高硬度の金属板の成形に好適し、例えばカラー受像管の
シャドウマスクや各種電子管のメツシュ等所定の曲面状
のわずかな変形がＩＶｊＩ生劣化の要因となるものに特
に有効である。In the above embodiments, a case was explained in which a spherical part with the same three axes was molded, but the present invention can be applied when the curvatures of the three axes of the final target curved part are all different, or when the curvature of the three axes is the same but the central part is molded with the same axis. Needless to say, this method can also be applied to an aspherical surface whose curvature changes from the periphery to the periphery. In addition, the curved surface of the present invention is suitable for forming objects with small curvature, small rectangular frame shapes, or metal plates with high hardness, such as shadow masks of color picture tubes, meshes of various electron tubes, etc. This is particularly effective for those where slight deformation of the curved surface is a cause of IVjI biodegradation.
以上のように本発明によれば、最終的に所定の曲面部が
容易に得られる金属板の成形方法を提供することができ
る。As described above, according to the present invention, it is possible to provide a method for forming a metal plate that allows a predetermined curved surface portion to be easily obtained in the end.
【図面の簡単な説明】
第１図は従来の圧縮成形法を説明するための模式図、第
２図及び第３図は本発明の詳細な説明するための模式図
である。
（１）・・・枠部 （４知力・折少曲げ部ｆ
５１．（６） 中央部BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram for explaining a conventional compression molding method, and FIGS. 2 and 3 are schematic diagrams for explaining the present invention in detail. (1)...Frame part (4 intelligence/folding part f
51. (6) Central part
Claims (1)
の曲率を有する曲面状となるように金型を用いて成形す
る金属板の成形方法において、前記成形金型の曲面部の
曲率が最終的に得られる所定の金属板の曲率よルも小さ
い金型を用いて圧縮成形することを特徴とする金属板の
成形方法。 ２）前記成形金型の曲面部の曲率が中央部から周端部ま
での距離が短かい軸はど最終的に得られる所定の金属板
の曲率に対する前記成形金型の曲面部曲率の変化の比率
が犬なることを特徴とする特許請求の範囲第１項記載の
金属板の成形方法。[Scope of Claims] 1) A method for forming a metal plate, which includes forming a substantially rectangular frame using a mold so that the inside of the rectangular frame has a curved surface having a predetermined curvature, A method for forming a metal plate, characterized in that compression molding is carried out using a mold in which the curvature of the curved surface portion of the molding mold is smaller than the curvature of the predetermined metal plate ultimately obtained. 2) The curvature of the curved surface of the mold is determined by the axis where the distance from the center to the peripheral edge is short. 2. The method of forming a metal plate according to claim 1, wherein the ratio is a dog.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57212658A JPS59104220A (en) | 1982-12-06 | 1982-12-06 | Forming method of metallic plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57212658A JPS59104220A (en) | 1982-12-06 | 1982-12-06 | Forming method of metallic plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59104220A true JPS59104220A (en) | 1984-06-16 |
Family
ID=16626260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57212658A Pending JPS59104220A (en) | 1982-12-06 | 1982-12-06 | Forming method of metallic plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59104220A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5729462A (en) * | 1995-08-25 | 1998-03-17 | Northrop Grumman Corporation | Method and apparatus for constructing a complex tool surface for use in an age forming process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS512915A (en) * | 1974-06-28 | 1976-01-12 | Kawasaki Steel Co |
-
1982
- 1982-12-06 JP JP57212658A patent/JPS59104220A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS512915A (en) * | 1974-06-28 | 1976-01-12 | Kawasaki Steel Co |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5729462A (en) * | 1995-08-25 | 1998-03-17 | Northrop Grumman Corporation | Method and apparatus for constructing a complex tool surface for use in an age forming process |
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