JPH06114529A - Gasket for double stoke - Google Patents
Gasket for double stokeInfo
- Publication number
- JPH06114529A JPH06114529A JP4293918A JP29391892A JPH06114529A JP H06114529 A JPH06114529 A JP H06114529A JP 4293918 A JP4293918 A JP 4293918A JP 29391892 A JP29391892 A JP 29391892A JP H06114529 A JPH06114529 A JP H06114529A
- Authority
- JP
- Japan
- Prior art keywords
- inner cylinder
- double
- flange
- gasket
- outer cylinder
- 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
Links
Landscapes
- Laminated Bodies (AREA)
- Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は差圧鋳造に用いる二重
ストークに関し、詳しくは該二重ストークに用いるガス
ケットに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double stalk used for differential pressure casting, and more particularly to a gasket used for the double stalk.
【０００２】[0002]
【従来の技術】アルミニウムなどの酸化されやすい材料
から低圧鋳造法などによって製品を鋳造するときには、
溶湯の酸化を防止して良質の製品を得るために、不活性
ガス雰囲気下で鋳造することが好ましい。この不活性ガ
ス雰囲気下での鋳造に適したストークとしては、内外筒
よりなる二重ストークが好ましく、本出願人はより具体
的な二重ストークの構造について、平成３年特許願第２
０４９０７号にて提案した。この構造は基本的に、上部
にフランジを設けた内筒と、該内筒との間に環状間隙を
あけて外装した外筒と、内筒のフランジ下面と外筒の上
部上面との間に介装され環状間隙と外部とを連通する孔
を穿設した円板体とを有するという構成である。この二
重ストークでは当然に、内筒のフランジ下面と円板体上
面との間、及び外筒の上部上面と円板体下面との間をガ
スケットによってシールする必要がある。この二重スト
ーク用ガスケットの具体的構成及び素材については、従
来技術として特段の提案は見当たらないが、本出願人は
山形の鋼板を半径方向に積層し、該積層鋼板内に充填材
を充填した二重ストーク用ガスケットを用いており、そ
の際充填材としては繊維状のシリカファイバーを使用し
ていた。2. Description of the Related Art When casting a product from a material such as aluminum which is easily oxidized by a low pressure casting method,
In order to prevent oxidation of the molten metal and obtain a good quality product, it is preferable to perform casting in an inert gas atmosphere. As a stalk suitable for casting under this inert gas atmosphere, a double stalk composed of an inner and outer cylinders is preferable, and the applicant of the present invention has a more specific double stalk structure.
Proposed in No. 04907. This structure is basically an inner cylinder having a flange on the top, an outer cylinder having an annular gap between the inner cylinder and the outer cylinder, and a flange lower surface of the inner cylinder and an upper upper surface of the outer cylinder. It is configured to have a disk body that is interposed and has a hole that communicates the annular gap with the outside. In this double stalk, of course, it is necessary to seal with a gasket between the lower surface of the flange of the inner cylinder and the upper surface of the disc body, and between the upper upper surface of the outer cylinder and the lower surface of the disc body. Regarding the specific structure and material of this double stalk gasket, no particular proposal is found as a conventional technique, but the applicant of the present invention laminated mountain-shaped steel plates in the radial direction and filled the laminated steel plate with a filler. A double stalk gasket was used, and in that case, a fibrous silica fiber was used as a filler.
【０００３】[0003]
【発明が解決しようとする課題】しかるにシリカは最高
使用温度が３５０℃程度と耐熱性に乏しく、熱によって
劣化して粉状となって飛散するおそれがあり、このため
シリカを充填した二重ストーク用ガスケットでは、比較
的少数回の鋳造によってガスケットを交換せざるをえ
ず、鋳造効率の低下を招くおそれがあった。またシリカ
はファイバー径が比較的太径のために気密性が必ずしも
十分ではなく、同時にシールすべき相手方材料とのなじ
み性も十分とはいえず、このため必ずしも完全な不活性
ガス雰囲気下での鋳造を可能とするものとはいえなかっ
た。したがって本発明は、耐用寿命が長く、したがって
鋳造効率の低下を招くことがなく、またシール性、なじ
み性が十分であり、したがって完全な不活性ガス雰囲気
下での鋳造を可能とする二重ストーク用ガスケットを提
供することを目的とする。However, silica has a poor maximum heat resistance of about 350 ° C. and may be deteriorated by heat to be dispersed in powder form. Therefore, silica-filled double stalk is used. The gasket for use inevitably has to be replaced with a relatively small number of times of casting, which may lead to a drop in casting efficiency. In addition, since silica has a relatively large fiber diameter, it does not necessarily have sufficient airtightness, and at the same time, it cannot be said that it is sufficiently compatible with the mating material to be sealed. It was not possible to make casting. Therefore, the present invention has a long service life and therefore does not cause a decrease in casting efficiency, and has sufficient sealing property and conformability, and thus a double stalk that enables casting under a completely inert gas atmosphere. It is intended to provide a gasket for use.
【０００４】[0004]
【課題を解決するための手段】本発明は、充填材として
膨張黒鉛を用いることにより、上記目的を達成したもの
である。その際積層鋼板の半径方向内側と外側との少な
くとも一方に充填する充填材としてアスベストを用い、
残余の部分の充填材として膨張黒鉛を用いることもでき
る。The present invention has achieved the above object by using expanded graphite as a filler. At that time, asbestos is used as a filler to be filled in at least one of the radially inner side and the outer side of the laminated steel sheet,
Expanded graphite can also be used as a filler for the remaining portion.
【０００５】[0005]
【作用】膨張黒鉛は最高使用温度が６００℃程度と十分
な耐熱性を有し、またファイバー径が比較的細径のため
に十分な気密性を得ることができ、同時にシールすべき
相手方材料とのなじみ性も最も良好である。したがって
膨張黒鉛を充填材として用いることにより、二重ストー
ク用ガスケットの耐用寿命を大幅に長くすることができ
ると共に、完全な不活性ガス雰囲気下での鋳造が可能と
なる。しかしながらガスケットの外径側には通常空気が
存在し、内径側は鋳造時には不活性ガスによって覆われ
ているものの補修時等には空気が存在し、高温の膨張黒
鉛はこの空気と反応するおそれがある。膨張黒鉛以外の
材料としてはアスベストがあり、アスベストは最高使用
温度が６００℃程度と十分な耐熱性を有し、しかも空気
に対して安定である。しかるにアスベストは、ファイバ
ー径がシリカと膨張黒鉛との中間程度であるから気密性
も中間程度しかなく、同時にシールすべき相手方材料と
のなじみ性も膨張黒鉛よりは劣り、また公害上の問題を
惹起するおそれもある。したがって積層鋼板の半径方向
例えば内側と外側にのみアスベストを充填し、残余の部
分には膨張黒鉛を充填することにより、気密性やなじみ
性を損なうことがなく、しかも熱に対して劣化すること
のない二重ストーク用ガスケットを得ることができる。[Explanation] Expanded graphite has sufficient heat resistance at a maximum operating temperature of about 600 ° C, and since it has a relatively small fiber diameter, it can obtain sufficient airtightness, and at the same time it can be used as a mating material to be sealed. It has the best compatibility. Therefore, by using expanded graphite as a filler, the service life of the double stalk gasket can be significantly extended, and casting can be performed in a completely inert gas atmosphere. However, air is usually present on the outer diameter side of the gasket, and air is present on the inner diameter side when it is covered, although it is covered with an inert gas at the time of casting, and high-temperature expanded graphite may react with this air. is there. Asbestos is a material other than expanded graphite, and asbestos has a maximum operating temperature of about 600 ° C. and has sufficient heat resistance and is stable to air. However, asbestos has a fiber diameter that is intermediate between silica and expanded graphite, so it has only an intermediate degree of airtightness, and at the same time is less compatible with the mating material to be sealed than expanded graphite, and also causes pollution problems. There is also a risk of Therefore, by filling asbestos only in the radial direction of the laminated steel sheets, for example, only inside and outside, and filling the remaining portion with expanded graphite, airtightness and conformability are not impaired, and further deterioration due to heat can be prevented. No double stalk gasket can be obtained.
【０００６】[0006]
【実施例】本発明を図面によって説明する。図１は本発
明によるガスケットを用いる二重ストークの一例を示
し、この二重ストークはサイアロンによって形成した内
筒１を有し、内筒１の上部にはフランジ１ａが形成され
ている。内筒１の外側には、内筒１との間に環状間隙３
をあけてサイアロンによって形成した外筒２が外装され
ており、外筒２の上部にもフランジ２ａが形成されてい
る。内筒のフランジ１ａ下面と外筒２上端との間には円
板体４が介装されており、この円板体４には、環状間隙
３と外部とを連通する孔４ａが半径方向に穿設されてい
る。内筒のフランジ１ａは円板体４と円板状の上抑え板
５とによって挟持されており、円板体４と上抑え板５と
はボルト９ａによって互いに固定されている。内筒のフ
ランジ１ａ上面と上抑え板５下面との間にはパッキン８
ａが介在しており、内筒のフランジ１ａ下面と円板体４
上面との間にはガスケット７ａが介在している。また外
筒のフランジ２ａは円板体４と円板状の下抑え板６とに
よって挟持されており、円板体４と下抑え板６とはボル
ト９ｂによって互いに固定されている。外筒２の上端と
円板体４下面との間にはガスケット７ｂが介在してお
り、外筒のフランジ２ａ上面と円板体４下面との間には
パッキン８ｂが介在しており、外筒のフランジ２ａ下面
と下抑え板６上面との間にはパッキン８ｃが介在してお
り、こうして内外筒１，２は、上抑え板５、円板体４及
び下抑え板６によって相互に固定されている。内筒１の
上端は金型の湯口（図示せず）に接続されており、内筒
１の下端は保持炉内の溶湯（同前）の湯面よりも高く保
たれており、外筒２の下端は溶湯に浸漬している。また
円板体に形成した孔４ａには、不活性ガス供給装置（同
前）が接続されている。The present invention will be described with reference to the drawings. FIG. 1 shows an example of a double stalk using a gasket according to the present invention. The double stalk has an inner cylinder 1 formed of sialon, and a flange 1a is formed on the upper part of the inner cylinder 1. On the outside of the inner cylinder 1, an annular gap 3 is formed between the inner cylinder 1 and the inner cylinder 1.
The outer cylinder 2 formed by a sialon is opened, and a flange 2a is also formed on the upper part of the outer cylinder 2. A disc body 4 is interposed between the lower surface of the flange 1a of the inner cylinder and the upper end of the outer cylinder 2. The disc body 4 has a hole 4a communicating the annular gap 3 with the outside in the radial direction. Has been drilled. The flange 1a of the inner cylinder is sandwiched by a disc body 4 and a disc-shaped upper restraining plate 5, and the disc body 4 and the upper restraining plate 5 are fixed to each other by a bolt 9a. A packing 8 is provided between the upper surface of the flange 1a of the inner cylinder and the lower surface of the upper holding plate 5.
a is interposed, the lower surface of the flange 1a of the inner cylinder and the disc body 4
A gasket 7a is interposed between the upper surface and the upper surface. The flange 2a of the outer cylinder is sandwiched between the disc body 4 and the disc-shaped lower holding plate 6, and the disc body 4 and the lower holding plate 6 are fixed to each other by bolts 9b. A gasket 7b is interposed between the upper end of the outer cylinder 2 and the lower surface of the disk body 4, and a packing 8b is interposed between the upper surface of the flange 2a of the outer cylinder and the lower surface of the disk body 4. A packing 8c is interposed between the lower surface of the flange 2a of the cylinder and the upper surface of the lower holding plate 6, and thus the inner and outer cylinders 1 and 2 are fixed to each other by the upper holding plate 5, the disc body 4, and the lower holding plate 6. Has been done. The upper end of the inner cylinder 1 is connected to the sprue (not shown) of the mold, and the lower end of the inner cylinder 1 is kept higher than the level of the molten metal (same as above) in the holding furnace. The lower end of is immersed in the molten metal. An inert gas supply device (same as above) is connected to the hole 4a formed in the disc body.
【０００７】図２は上記ガスケット７ａ，７ｂを示す。
このガスケット７ａ，７ｂは山形の鋼板を「く」字状の
凸部が大径側となるように配置し、渦巻き状に巻回して
半径方向に多重に積層し、この積層鋼板１０内に充填材
を充填した構造となっており、積層鋼板１０としてはＳ
ＵＳ３１６、充填材としては膨張黒鉛１１ａのファイバ
ーを用いている。FIG. 2 shows the gaskets 7a and 7b.
The gaskets 7a and 7b are formed by arranging chevron-shaped steel plates so that the "V" -shaped convex portions are on the large diameter side, are wound in a spiral shape, and are laminated in the radial direction in multiple layers. The structure is such that the laminated steel sheet 10 is filled with S
US316, the fiber of expanded graphite 11a is used as the filler.
【０００８】本実施例は以上のように構成されており、
膨張黒鉛１１ａは十分な耐熱性を有するから、二重スト
ーク用ガスケット７ａ，７ｂの耐用寿命は大幅に長くな
り、鋳造効率の向上を図ることができる。また膨張黒鉛
１１ａのファイバー径は十分に細径のために十分な気密
性となじみ性を有し、したがって完全な不活性ガス雰囲
気下での鋳造が可能となる。This embodiment is constructed as described above,
Since the expanded graphite 11a has sufficient heat resistance, the service life of the double stalk gaskets 7a and 7b is significantly extended, and casting efficiency can be improved. Further, since the fiber diameter of the expanded graphite 11a is sufficiently small, the expanded graphite 11a has sufficient airtightness and conformability, and therefore can be cast in a completely inert gas atmosphere.
【０００９】図３は本発明の別の実施例を示し、積層鋼
板１０の半径方向内側と外側に充填する充填材としてア
スベスト１１ｂを用い、残余の部分の充填材として膨張
黒鉛１１ａを用いたものである。すなわちガスケット７
ａ，７ｂの外径側には通常空気が存在するから、高温の
膨張黒鉛１１ａはこの空気と反応するおそれがある。し
かるにこの実施例の膨張黒鉛１１ａの外径側にはアスベ
スト１１ｂが充填されおり、アスベスト１１ｂは十分な
耐熱性を有し、しかも空気に対して安定であるから、膨
張黒鉛１１ａの外径側部分の酸化はアスベスト１１ｂに
よって防止されている。他方ガスケット７ａ，７ｂの内
径側は鋳造時には不活性ガスによって覆われているもの
の、通常外径側よりも高温となっており、もしも空気が
存在すれば膨張黒鉛１１ａの酸化を招くおそれがある。
しかるにこの実施例では膨張黒鉛１１ａの内径側にもア
スベスト１１ｂが充填されているから、膨張黒鉛１１ａ
の内径側部分の酸化も防止されている。したがってこの
実施例のガスケット７ａ，７ｂは、耐熱性や、気密性、
なじみ性を損なうことがなく、しかも熱に対して劣化す
ることのない二重ストーク用ガスケットである。FIG. 3 shows another embodiment of the present invention, in which asbestos 11b is used as a filler for filling the inner and outer sides of the laminated steel sheet 10 in the radial direction, and expanded graphite 11a is used as a filler for the remaining portion. Is. That is, the gasket 7
Since air is usually present on the outer diameter side of a and 7b, the high temperature expanded graphite 11a may react with this air. However, the outer diameter side of the expanded graphite 11a of this embodiment is filled with asbestos 11b, and the asbestos 11b has sufficient heat resistance and is stable to air. Is prevented by asbestos 11b. On the other hand, the inner diameter sides of the gaskets 7a and 7b are covered with an inert gas at the time of casting, but are usually at a higher temperature than the outer diameter side, and if air is present, the expanded graphite 11a may be oxidized.
However, in this embodiment, asbestos 11b is also filled on the inner diameter side of the expanded graphite 11a.
Oxidation of the inner diameter side portion is also prevented. Therefore, the gaskets 7a and 7b of this embodiment have heat resistance, airtightness,
A double stalk gasket that does not impair the conformability and does not deteriorate with heat.
【００１０】[0010]
【発明の効果】本発明によって耐用寿命が長く、したが
って鋳造効率の低下を招くことがなく、またシール性、
なじみ性が十分であり、したがって完全な不活性ガス雰
囲気下での鋳造を可能とする二重ストーク用ガスケット
が得られた。EFFECTS OF THE INVENTION The present invention has a long service life and therefore does not cause a decrease in casting efficiency, and has a good sealing property.
A double stalk gasket was obtained which was sufficiently compatible and thus allowed casting in a completely inert gas atmosphere.
【図１】二重ストークの一例を示す部分断面正面図FIG. 1 is a partial sectional front view showing an example of double stalk.
【図２】本発明の一実施例の要部断面斜視図FIG. 2 is a cross-sectional perspective view of an essential part of an embodiment of the present invention.
【図３】別の実施例の要部断面斜視図FIG. 3 is a cross-sectional perspective view of a main part of another embodiment.
１…内筒 ２…外筒 １
ａ，２ａ…フランジ ３…環状間隙 ４…円板体 ４
ａ…孔 ５…上抑え板 ６…下抑え板 ７
ａ，７ｂ…ガスケット ８ａ，８ｂ，８ｃ…パッキン ９
ａ，９ｂ…ボルト １０…積層鋼板 １１ａ…膨張黒鉛 １
１ｂ…アスベスト1 ... Inner cylinder 2 ... Outer cylinder 1
a, 2a ... Flange 3 ... Annular gap 4 ... Disc body 4
a ... hole 5 ... upper holding plate 6 ... lower holding plate 7
a, 7b ... Gasket 8a, 8b, 8c ... Packing 9
a, 9b ... bolt 10 ... laminated steel sheet 11a ... expanded graphite 1
1b ... Asbestos
Claims (2)
の間に環状間隙をあけて外装した外筒と、内筒の前記フ
ランジ下面と前記外筒の上部上面との間に介装され前記
環状間隙と外部とを連通する孔を穿設した円板体とを有
する二重ストークの、内筒の前記フランジ下面と前記円
板体上面との間、及び外筒の前記上部上面と前記円板体
下面との間に介装され、山形の鋼板を半径方向に積層
し、該積層鋼板内に充填材を充填した二重ストーク用ガ
スケットにおいて、 前記充填材として膨張黒鉛を用いたことを特徴とする二
重ストーク用ガスケット。Claim: What is claimed is: 1. An inner cylinder having a flange on the top, an outer cylinder having an annular gap between the inner cylinder and the outer cylinder, and between the flange lower surface of the inner cylinder and the upper upper surface of the outer cylinder. Between the lower surface of the flange of the inner cylinder and the upper surface of the disk, and the upper part of the outer cylinder of a double stalk having an intervening disk body having a hole for communicating the annular gap with the outside. In a double stalk gasket interposed between an upper surface and a lower surface of the disc body, a mountain-shaped steel plate is laminated in a radial direction, and a filler is filled in the laminated steel plate, wherein expanded graphite is used as the filler. A double stalk gasket characterized by the fact that it was used.
なくとも一方に充填する充填材としてアスベストを用
い、残余の部分の充填材として膨張黒鉛を用いた請求項
１記載の二重ストーク用ガスケット。2. The double stalk gasket according to claim 1, wherein asbestos is used as a filler to fill at least one of an inner side and an outer side in the radial direction of the laminated steel sheet, and expanded graphite is used as a filler for the remaining portion. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4293918A JP2809014B2 (en) | 1992-10-06 | 1992-10-06 | Gasket for double stoke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4293918A JP2809014B2 (en) | 1992-10-06 | 1992-10-06 | Gasket for double stoke |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06114529A true JPH06114529A (en) | 1994-04-26 |
| JP2809014B2 JP2809014B2 (en) | 1998-10-08 |
Family
ID=17800848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4293918A Expired - Fee Related JP2809014B2 (en) | 1992-10-06 | 1992-10-06 | Gasket for double stoke |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2809014B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001008837A1 (en) * | 1999-07-30 | 2001-02-08 | Foseco International Limited | Stopper rod |
| US6216766B1 (en) * | 1994-02-10 | 2001-04-17 | Reynolds Wheels International Ltd. | Fluid-tight coupling device for a feeder pipe |
| WO2002083344A1 (en) * | 2001-04-18 | 2002-10-24 | Foseco International Limited | Metallurgical gasket |
| CN105750527A (en) * | 2016-04-19 | 2016-07-13 | 哈尔滨东安发动机（集团）有限公司 | Method for sealing riser tube for casting |
| CN105750528A (en) * | 2016-04-19 | 2016-07-13 | 哈尔滨东安发动机（集团）有限公司 | Sealing structure of riser tube for casting |
-
1992
- 1992-10-06 JP JP4293918A patent/JP2809014B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6216766B1 (en) * | 1994-02-10 | 2001-04-17 | Reynolds Wheels International Ltd. | Fluid-tight coupling device for a feeder pipe |
| WO2001008837A1 (en) * | 1999-07-30 | 2001-02-08 | Foseco International Limited | Stopper rod |
| WO2002083344A1 (en) * | 2001-04-18 | 2002-10-24 | Foseco International Limited | Metallurgical gasket |
| CN105750527A (en) * | 2016-04-19 | 2016-07-13 | 哈尔滨东安发动机（集团）有限公司 | Method for sealing riser tube for casting |
| CN105750528A (en) * | 2016-04-19 | 2016-07-13 | 哈尔滨东安发动机（集团）有限公司 | Sealing structure of riser tube for casting |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2809014B2 (en) | 1998-10-08 |
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