JPS5827015B2 - Molding method for pressure vessel head - Google Patents
Molding method for pressure vessel headInfo
- Publication number
- JPS5827015B2 JPS5827015B2 JP9761080A JP9761080A JPS5827015B2 JP S5827015 B2 JPS5827015 B2 JP S5827015B2 JP 9761080 A JP9761080 A JP 9761080A JP 9761080 A JP9761080 A JP 9761080A JP S5827015 B2 JPS5827015 B2 JP S5827015B2
- Authority
- JP
- Japan
- Prior art keywords
- blank
- molding
- pressure vessel
- molding method
- vessel head
- 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
Links
Landscapes
- Forging (AREA)
Description
【発明の詳細な説明】
本発明は、板状素材から圧力容器ヘッドを成形するため
の精密プレス成形方法に関するものであるＯ
圧力容器は、球形、半球形又は楕円形のヘッドを有して
いるが、それは「般に、第１図に示す張出し成形又は第
２図に示す絞り込み成形によって成形される。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a precision press molding method for molding a pressure vessel head from a plate-shaped material. However, it is generally formed by stretch forming as shown in FIG. 1 or draw forming as shown in FIG.
すなわち、ポンチ１とダイス２とによってブランク３を
成形する。That is, a blank 3 is formed using a punch 1 and a die 2.
しかし、このように成形されるヘッドは、特に半球形ヘ
ッドにトいて、中心部付近が薄肉になり、口元付近が厚
肉になり、肉厚偏差が２５〜３０φと大きく、余肉除去
のために多くの機械加工を必要とする。However, the head formed in this way, especially the hemispherical head, has a thinner wall near the center and a thicker wall near the mouth, and the wall thickness deviation is as large as 25 to 30 φ, and it is necessary to remove excess thickness. requires a lot of machining.
また、プレス成形時に、第１図の矢印４で示すようにし
わ押さえを行なう場合には、口元に余長が必要である。Further, when suppressing wrinkles as shown by arrow 4 in FIG. 1 during press molding, extra length is required at the mouth.
更に、第２図のように絞り込み成形を行なう場合にも、
成形時の偏心を補償するために、口元余長が必ず必要で
ある。Furthermore, when performing draw forming as shown in Figure 2,
To compensate for eccentricity during molding, extra length at the mouth is always required.
従って、従来の成形方法は歩留りが非常に悪かった。Therefore, the yield of conventional molding methods was very poor.
加えて、第２図の絞り込み成形にむいては、子午線方向
４５°付近のふくらみを防止するために、下金型は製品
の外部寸法に対応したうす状の型にしてプレス成形最終
時にこの下金型に成形品を押し付けて矯正しなければな
らず、下金型の製作費用は多大なものになっていた。In addition, for the draw forming shown in Fig. 2, in order to prevent bulges around 45° in the meridian direction, the lower mold is made into a thin mold that corresponds to the external dimensions of the product, and the lower mold is removed at the final stage of press forming. The molded product had to be pressed against the mold to correct it, and the cost of manufacturing the lower mold was high.
従って、本発明は、機械加工を少なくすることができて
歩留りの良い圧力容器ヘッドの精密プレス成形方法を提
供することを、その目的とするものである。Therefore, an object of the present invention is to provide a precision press molding method for a pressure vessel head that can reduce machining and has a high yield.
以下、本発明を添付図面の第３〜６図に基づいて説明す
る。Hereinafter, the present invention will be explained based on FIGS. 3 to 6 of the accompanying drawings.
本発明による成形方法は、１ず第３図に示すような多角
形のブランク５を板材から作製し、このブランク５を第
４図に示す平型ダイス２及びポンチ１によって成形する
ことから成り立っている。The forming method according to the present invention consists of first producing a polygonal blank 5 as shown in FIG. 3 from a plate material, and then forming this blank 5 with a flat die 2 and a punch 1 shown in FIG. There is.
すなわち、本成形方法の基本的な特徴は、従来は円形で
あったブランク形状を多角形にしたことにある。That is, the basic feature of this molding method is that the blank shape, which was conventionally circular, is made polygonal.
これによって、プレス成形中に口元付近により大きな静
水圧効果（高静水圧下に釦いて金属に塑性変形を加える
とその延性が増加する現象）が生じ、中心部付近との肉
厚偏差が小さくなるのである。As a result, a larger hydrostatic pressure effect occurs near the mouth area during press forming (a phenomenon in which the ductility of metal increases when plastic deformation is applied to the metal under high hydrostatic pressure), and the wall thickness deviation from the center area becomes smaller. It is.
ブランクを多角形にすることにより肉厚偏差が小さくな
る理由を第５図により説明する。The reason why the wall thickness deviation is reduced by making the blank polygonal will be explained with reference to FIG.
第５図は、ブランク５の最初の形状、成形途中の形状６
、及び竺７二芸７を示す。Figure 5 shows the initial shape of the blank 5 and the shape 6 in the middle of forming.
, and Jiku 7 Nigei 7 are shown.
半球形の中ル 多角形ブランク５の頂部Ａ１での距
離が中心０かも頂間部Ｃ１での距離よりも長いので、成
形中の絞り込みに対する抵抗はＣ部よりもＡ部の方が大
きい。Since the distance at the apex A1 of the hemispherical polygonal blank 5 is longer than the distance at the center C1, the resistance to squeezing during molding is greater in the A part than in the C part.
従って、成形中に中心方向に引き込１れる量はＣ部の方
が大きく、Ｃ部は次第にくぼんで、Ａ部は耳状になって
くる。Therefore, the amount drawn toward the center during molding is larger in the C portion, and the C portion gradually becomes concave, and the A portion becomes ear-shaped.
またＣ部は中心方向に引き込１れると共に絞り込みによ
って円周方向に圧縮応力を受ける。In addition, the C section is pulled in toward the center and receives compressive stress in the circumferential direction due to narrowing.
従って口元付近のＢ部には、絞り込みによる円周方向の
圧縮応力に、Ｃ部の引き込みによる圧縮応力が加わるの
でより大きな円周方向圧縮応力を受ける。Therefore, the B portion near the mouth receives a larger circumferential compressive stress because the compressive stress due to the drawing of the C portion is added to the circumferential compressive stress due to the narrowing.
成形の最終時には、成形途中で耳状となったＡ部が第４
図に示すように平型ダイス２に対する案内となり、Ｂ部
に引張力を生ずるので、Ｂ部の応力状態は、大きな円周
方向の圧縮応力が作用する状態の下で引張り応力が作用
する静水圧引張りの条件となる。At the end of molding, part A, which became ear-shaped during molding, becomes the fourth part.
As shown in the figure, it serves as a guide for the flat die 2 and generates tensile force in part B, so the stress state in part B is hydrostatic pressure where tensile stress acts under the condition of large compressive stress in the circumferential direction. This is the condition for tension.
この効果によって口元付近の材料はより大きく伸びて口
元付近は減肉される。Due to this effect, the material near the mouth stretches more and the material near the mouth becomes thinner.
ここで静水圧引張りの条件とは、圧縮応力を加えた状態
で引張ることをいい、この状態では単純引張と比較して
変形が容易になる。Here, the hydrostatic tension condition refers to stretching with compressive stress applied, and in this state deformation becomes easier compared to simple tension.
第６図に本発明の成形方法により半球形ヘッドを成形し
た場合の余白量（実線Ａで示す）と、従来の絞り込み成
形による場合の余肉量（破線Ｂで示す）とを比較して示
す。Fig. 6 shows a comparison between the amount of blank space (indicated by solid line A) when a hemispherical head is molded by the molding method of the present invention and the amount of excess wall thickness (indicated by broken line B) when the conventional drawing method is used. .
これによると、口元付近の余肉量は４３醋から２０關ｔ
で減少し、これを肉厚偏差で表わすと２７％から１３％
に減少しており、本発明方法の効果が犬であることがわ
かる。According to this, the amount of excess meat around the mouth ranges from 43 tons to 20 tons.
When expressed as wall thickness deviation, it decreases from 27% to 13%.
This shows that the method of the present invention is effective for dogs.
なお、有効な圧縮応力を生じさせるために、多角形ブラ
ンクの最適角数は製品の口元径が大きくなるに従って増
加させる必要があり、それは板取りの都合から偶数角が
望ましい。In order to generate effective compressive stress, the optimal number of angles of the polygonal blank needs to increase as the mouth diameter of the product increases, and an even number of angles is preferable for convenience of blanking.
捷た、本発明の多角形ブランクを用いた成形方法によれ
ば、第４図に示すように耳状部分が案内になるため、従
来の張出し成形においては必要であったしわ押えをしな
くても、下方に抜は落ちることなく、また偏心もほとん
どなく、成形することができる。According to the molding method using the folded polygonal blank of the present invention, the ear-like portions serve as guides as shown in Figure 4, so there is no need to press the wrinkles, which is necessary in conventional stretch molding. It can also be molded without falling downward and with almost no eccentricity.
従って、口元の余長は従来の成形方法に比べて著しく少
なくすることができ、歩留を向上させることができる。Therefore, the extra length at the mouth can be significantly reduced compared to conventional molding methods, and the yield can be improved.
さらに、本発明の利点は製品寸法がポンチ形状によって
のみ定するため、下金型は平型ダイスで十分であり、第
２図に示した絞り込み成形の場合のうす状の下金型が不
要になることである。Furthermore, an advantage of the present invention is that the product dimensions are determined only by the punch shape, so a flat die is sufficient for the lower mold, eliminating the need for the thin lower mold used in draw forming as shown in Figure 2. It is what happens.
従って、下金型の製作費は絞り込み成形の場合に比べて
著しく安く、また型を補修して別の寸法の下金型に流用
する場合にも、その補修費はきわめて安くなる。Therefore, the manufacturing cost of the lower mold is significantly lower than that in the case of draw molding, and even when the mold is repaired and used for a lower mold of a different size, the repair cost is also extremely low.
また、本発明による成形方法は、成形前の心合せなどの
手間がかからず作業性を向上させるＯ
以上のように、多角形ブランクを用いた本発明の圧力容
器ヘッドの精密成形方法は、肉厚偏差を少なくすること
ができ、これによって、機械加工時間を減少させること
ができると共に歩留りの向上を達成することができ、更
に下金型製作費を減少することができる。In addition, the molding method according to the present invention does not require the labor of alignment before molding and improves workability.As described above, the method for precision molding a pressure vessel head according to the present invention using a polygonal blank It is possible to reduce wall thickness deviation, thereby reducing machining time, improving yield, and further reducing lower mold manufacturing costs.
第１図は従来の張出し成形を示す断面図、第２図は従来
の絞り込み成形を示す断面図、第３図は本発明の成形方
法に使用する多角形ブランクを示す図、第４図は本発明
成形方法により成形中の金型及びブランクを示す断面図
、第５図は本発明による成形過程を説明するためにブラ
ンク形状の変化を順次示す概略図、第６図は本発明方法
及び従来方法により発生する余肉量を示す線図である。
１・・・ポンチ、２・・・ダイス、３・・・円形ブラン
ク、５・・・多角形ブランク。Fig. 1 is a sectional view showing conventional stretch forming, Fig. 2 is a sectional view showing conventional draw forming, Fig. 3 is a view showing a polygonal blank used in the forming method of the present invention, and Fig. 4 is a sectional view showing the present invention. A sectional view showing a mold and a blank being molded by the inventive molding method, FIG. 5 is a schematic diagram showing sequential changes in the shape of the blank to explain the molding process according to the invention, and FIG. 6 is a cross-sectional view showing the inventive method and the conventional method. FIG. 1... Punch, 2... Dice, 3... Circular blank, 5... Polygonal blank.
Claims (1)
、上金型としてポンチ及び下金型として平型ダイスを使
用して成形することを特徴とする圧力容器ヘッドの成形
方法。1. A method for molding a pressure vessel head, characterized in that the blank has a polygonal shape and the polygonal blank is molded using a punch as an upper mold and a flat die as a lower mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9761080A JPS5827015B2 (en) | 1980-07-18 | 1980-07-18 | Molding method for pressure vessel head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9761080A JPS5827015B2 (en) | 1980-07-18 | 1980-07-18 | Molding method for pressure vessel head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5722825A JPS5722825A (en) | 1982-02-05 |
| JPS5827015B2 true JPS5827015B2 (en) | 1983-06-07 |
Family
ID=14196980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9761080A Expired JPS5827015B2 (en) | 1980-07-18 | 1980-07-18 | Molding method for pressure vessel head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5827015B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0633098B2 (en) * | 1987-04-21 | 1994-05-02 | 東洋製罐株式会社 | Plastic cap |
| JPH0317053U (en) * | 1989-06-30 | 1991-02-20 | ||
| KR100812039B1 (en) * | 2001-08-02 | 2008-03-10 | 주식회사 포스코 | A METHOD FOR DETERMINING BLANK SHAPE for SINK MANUFACTURING PROCESS |
| CN104786010A (en) * | 2014-01-21 | 2015-07-22 | 无锡市前洲西塘锻压有限公司 | Manufacturing method for nickel composite board end sockets |
| CN104786013A (en) * | 2014-01-21 | 2015-07-22 | 无锡市前洲西塘锻压有限公司 | Manufacturing method for nickel board end sockets |
| CN104786012A (en) * | 2014-01-21 | 2015-07-22 | 无锡市前洲西塘锻压有限公司 | Manufacturing method for nichrome end sockets |
| CN104786011A (en) * | 2014-01-21 | 2015-07-22 | 无锡市前洲西塘锻压有限公司 | Manufacturing method for nickel-copper end sockets |
| CN105750841B (en) * | 2016-04-21 | 2018-07-31 | 常州旷达威德机械有限公司 | A kind of processing method of ferritic stainless steel end socket |
-
1980
- 1980-07-18 JP JP9761080A patent/JPS5827015B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5722825A (en) | 1982-02-05 |
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