JPH0199805A - Production of ceramics port liner - Google Patents

Production of ceramics port liner

Info

Publication number
JPH0199805A
JPH0199805A JP25765687A JP25765687A JPH0199805A JP H0199805 A JPH0199805 A JP H0199805A JP 25765687 A JP25765687 A JP 25765687A JP 25765687 A JP25765687 A JP 25765687A JP H0199805 A JPH0199805 A JP H0199805A
Authority
JP
Japan
Prior art keywords
water
slurry
mold
ceramic
port liner
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
JP25765687A
Other languages
Japanese (ja)
Other versions
JPH052486B2 (en
Inventor
Toshiyuki Hamanaka
俊行 浜中
Setsu Harada
節 原田
Fumio Hattori
服部　文男
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.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
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 NGK Insulators Ltd filed Critical NGK Insulators Ltd
Priority to JP25765687A priority Critical patent/JPH0199805A/en
Priority to DE3888279T priority patent/DE3888279T2/en
Priority to EP88309526A priority patent/EP0312322B1/en
Publication of JPH0199805A publication Critical patent/JPH0199805A/en
Priority to US07/586,374 priority patent/US5013500A/en
Publication of JPH052486B2 publication Critical patent/JPH052486B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B28B1/261—Moulds therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B28B1/28—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor involving rotation of the mould about a centrifugal axis

Abstract

PURPOSE:To produce a ceramic port liner having accurate valve holes, by forming water-impermeable faces having a profile corresponding to the valve hole on the inner surface of a water-absorptive mold and pouring ceramic slurry thereinto. CONSTITUTION:Water-impermeable faces 4 having a profile corresponding to a valve hole is formed at the positions corresponding to the valve holes of the inner surface 3 of a mold 1 made of gypsum or water-absorptive resin. The water-absorptive molds 1, 2 are closed and ceramic slurry is poured thereinto. The moisture of the slurry in contact with the inner surfaces of the molds 1, 2 is absorbed by the mold, and the slurry gradually deposits on said inner surfaces. Since, however, the water-impermeable faces 4 cannot absorb the moisture, no slurry deposits on these faces at all. Accordingly, when the slurry remaining after the deposition is drained and the molds 1, 2 are opened, a port liner 6 having opened valve holes 5 can be produced.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明はガソリンエンジン、ディーゼルエンジン等の排
気ポートの内面をライニングするために用いられるセラ
ミックポートライナーの製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a ceramic port liner used for lining the inner surface of an exhaust port of a gasoline engine, a diesel engine, etc.

（従来の技術） エンジンの排気ポートの内面をセラミック製のポートラ
イナーでライニングし、その断熱作用により排ガス温度
を上昇させて触媒浄化性能の向上、ターボチャージャー
のターボラグ減少を図ること等は既に知られており、特
に排ガス温度が低下しゃすい４パルプエンジンに対して
は有効な手段であると考えられている。このようなセラ
ミックポートライナーは石膏型のような吸水性の鋳型の
内部にセラミックスラリ−を流し込み、型の内表面に着
肉させたうえで余分のスラリーを排出する排泥法スリッ
プキャスト成形によって成形することができる。ところ
がセラミックポートライナーには所定部分にバルブ孔を
明ける必要があるため、従来は成形後あるいは焼成後に
ドリル等を用いた機械加工によりバルブ孔を形成してい
た。しかし加工面が曲面であるために加工に時間がかか
ること、位置決めが困難であって正確な加工には多大な
手数を要すること、焼成後であっても脆いためにクラッ
クが入り易いこと等の多くの欠点が指摘されていた。(Prior art) It is already known that the inner surface of an engine's exhaust port is lined with a ceramic port liner, and its insulating effect increases the exhaust gas temperature, improving catalyst purification performance and reducing turbo lag of a turbocharger. It is considered to be an effective means, especially for four-pulp engines in which the exhaust gas temperature decreases. This kind of ceramic port liner is formed by pouring ceramic slurry into a water-absorbing mold such as a plaster mold, depositing it on the inner surface of the mold, and then draining the excess slurry by slip casting. be able to. However, since it is necessary to drill valve holes in predetermined portions of ceramic port liners, conventionally the valve holes have been formed by machining using a drill or the like after molding or firing. However, since the processed surface is a curved surface, processing takes time, positioning is difficult and accurate processing requires a lot of effort, and even after firing, it is brittle and cracks easily. Many shortcomings were pointed out.

（発明が解決しようとする問題点） 本発明は上記したような従来の問題点を解決して、正確
にバルブ孔が形成されたセラミソクポートライナーを排
泥法スリップキャストによって容易に製造することがで
きるセラミックポートライナーの製造方法を目的として
完成されたものである。(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, and makes it possible to easily manufacture a ceramic sock port liner in which valve holes are accurately formed by slip casting using the mud removal method. This was completed with the aim of creating a method for manufacturing ceramic port liners.

（問題点を解決するための手段） 本発明は内表面にバルブ孔に対応する不透水面が形成さ
れた吸水性の鋳型の内部にセラミックスラリ−を流し込
み、不透水面を除く部分に所要厚さに着肉させ、バルブ
孔の部分に孔のあいたセラミックポートライナーを得る
ことを特徴とするものである。(Means for Solving the Problems) The present invention involves pouring ceramic slurry into a water-absorbing mold having an impermeable surface corresponding to the valve hole formed on its inner surface, and then pouring the ceramic slurry into a water-absorbing mold having a water-impermeable surface formed on the inner surface to a required thickness in the portion excluding the impermeable surface. This method is characterized in that a ceramic port liner is obtained in which a hole is formed in the valve hole portion by adding flesh to the valve hole.

以下に本発明を図面を参照しつつ更に詳細に説明する。The present invention will be explained in more detail below with reference to the drawings.

第１図は本発明において用いられる吸水性の鋳型ｆｌｌ
、（２）を示すもので、石膏型を用いるのが普通である
が吸水性の樹脂型を用いることもできる。Figure 1 shows the water-absorbent mold used in the present invention.
, (2), and a plaster mold is usually used, but a water-absorbing resin mold can also be used.

この鋳型１１）の内表面（３）のバルブ孔に対応する位
置には、バルブ孔に対応する形状の不透水面（４）が形
成されている。不透水面（４）を形成するには不透水性
のシールを貼付ける方法、樹脂を塗布する方法、樹脂を
埋込む方法等の任意の手段を採用することができる。A water-impermeable surface (4) having a shape corresponding to the valve hole is formed on the inner surface (3) of the mold 11) at a position corresponding to the valve hole. To form the water-impermeable surface (4), any method such as pasting a water-impermeable seal, applying resin, or embedding resin can be employed.

このような吸水性の鋳型（１）、（２）を閉じ、その内
部にセラミックスラリ−を流し込む、セラミックスラリ
−の種類は特に限定されるものではないが、チタン酸ア
ルミニウム系のものを用いることが好ましい。これはこ
の材質がポートライナーに適した耐熱性と弾性率とを備
えているためである。The water-absorbent molds (1) and (2) are closed and the ceramic slurry is poured into them. The type of ceramic slurry is not particularly limited, but aluminum titanate-based slurry may be used. is preferred. This is because this material has heat resistance and elastic modulus suitable for port liners.

流し込まれたセラミックスラリ−は吸水性の鋳型＋１１
、（２）の内表面に接する部分で吸水され、次第に鋳型
＋１１、（２）の内側に着肉して行くが、不透水面（４
）にはこのような吸水効果がないのでこの部分では着肉
が全く生じない、、この結果、不透水面（４）以外の部
分に所定肉厚に着肉が行われた後に残りのセラミックス
ラリ−を排泥し、鋳型＋１１、（２）を開けば、第２図
に示されるようにバルブ孔（５）の部分に孔のあいたセ
ラミックポートライナー（６）を得ることができる。The poured ceramic slurry becomes a water-absorbing mold +11
, (2), water is absorbed at the part in contact with the inner surface of mold +11, (2), and gradually ink forms on the inside of mold +11, (2).
) does not have such a water absorption effect, so no inking occurs in this area.As a result, after inking is done to a predetermined thickness on the area other than the water-impermeable surface (4), the remaining ceramic slurry is removed. - is drained and the mold +11 (2) is opened to obtain a ceramic port liner (6) with a hole in the valve hole (5) as shown in FIG.

このようにして得られたセラミックポートライナー（６
）は孔の周縁部分をわずかに修正すればよく、無孔のセ
ラミックポートライナーに機械加工によってバルブ孔を
形成していた従来法に比較して加工工数をはるかに減少
させることができ機械加工によるクランクも防止できる
。またこの方法によれば機械加工によるバルブ孔（５）
の位置決めを必要とセずあらかじめ正確な位置にバルブ
孔（５）を形成することができるうえ、どのような曲面
にも自由にバルブ孔（５）を形成することができる。更
に、不透水面（４）の大きさを加減することによって、
極めて精度良くバルブ孔（５）の寸法精度を出すことも
できる。Ceramic port liner (6
) requires only slight modification of the periphery of the hole, which greatly reduces the number of machining steps compared to the conventional method in which the valve hole is formed by machining in a non-porous ceramic port liner. can also be prevented. Also, according to this method, the valve hole (5) is machined.
The valve hole (5) can be formed in advance at an accurate position without the need for positioning, and the valve hole (5) can be formed freely on any curved surface. Furthermore, by adjusting the size of the impermeable surface (4),
The dimensional accuracy of the valve hole (5) can also be achieved with extremely high precision.

（発明の効果） 本発明は以上の説明からも明らかなように、吸水性の鋳
型の内表面にバルブ孔に対応する不透水面を形成すると
いう簡単な手段によって、正確にバルブ孔が形成された
セラミックポートライナーを容易に製造することができ
るものであるから、従来の問題点を一掃したセラミック
ポートライナーの製造方法として、産業の発展に寄与す
るところは極めて大である。(Effects of the Invention) As is clear from the above description, the present invention allows valve holes to be accurately formed by a simple method of forming an impermeable surface corresponding to the valve hole on the inner surface of a water-absorbing mold. Since it is possible to easily manufacture a ceramic port liner, it will greatly contribute to the development of industry as a method for manufacturing a ceramic port liner that eliminates the problems of the conventional method.

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

第１図は本発明において用いられる鋳型を示す斜視図、
第２図は本発明によって得られたセラミックポートライ
ナーの斜視図である。 ＋１）、（２）：鋳型、（４）：不透水面、（５）：バ
ルブ孔。FIG. 1 is a perspective view showing a mold used in the present invention;
FIG. 2 is a perspective view of a ceramic port liner obtained by the present invention. +1), (2): Mold, (4): Impermeable surface, (5): Valve hole.

Claims (1)

【特許請求の範囲】[Claims] 内表面にバルブ孔に対応する不透水面が形成された吸水
性の鋳型の内部にセラミックスラリーを流し込み、不透
水面を除く部分に所要厚さに着肉させ、バルブ孔の部分
に孔のあいたセラミックポートライナーを得ることを特
徴とするセラミックポートライナーの製造方法。Ceramic slurry is poured into the inside of a water-absorbing mold with a water-impermeable surface corresponding to the valve hole formed on the inner surface, and the part excluding the water-impermeable surface is deposited to the required thickness, and a hole is formed in the valve hole. A method for producing a ceramic port liner, characterized by obtaining a ceramic port liner.
JP25765687A 1987-10-13 1987-10-13 Production of ceramics port liner Granted JPH0199805A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP25765687A JPH0199805A (en) 1987-10-13 1987-10-13 Production of ceramics port liner
DE3888279T DE3888279T2 (en) 1987-10-13 1988-10-12 Process for the production of ceramic hollow bodies.
EP88309526A EP0312322B1 (en) 1987-10-13 1988-10-12 Processes for producing hollow ceramic articles
US07/586,374 US5013500A (en) 1987-10-13 1990-09-21 Process for producing hollow ceramic articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25765687A JPH0199805A (en) 1987-10-13 1987-10-13 Production of ceramics port liner

Publications (2)

Publication Number Publication Date
JPH0199805A true JPH0199805A (en) 1989-04-18
JPH052486B2 JPH052486B2 (en) 1993-01-12

Family

ID=17309281

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25765687A Granted JPH0199805A (en) 1987-10-13 1987-10-13 Production of ceramics port liner

Country Status (1)

Country Link
JP (1) JPH0199805A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05149196A (en) * 1991-10-04 1993-06-15 Ngk Insulators Ltd Molding method for ceramic port liner
FR2907705A1 (en) * 2006-10-25 2008-05-02 Elmeceram Sa Ceramic container fabricating method, involves introducing slurry under pressure inside mold, avoiding penetrating appendage in space delimited by lateral walls to subsist excess slurry inside mold, and aspirating excess slurry
KR100861881B1 (en) * 2007-01-12 2008-10-09 한국생명공학연구원 Detection kit for infection by measuring the expression of gram positive bacteria or gram negative bacteria infection marker genes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05149196A (en) * 1991-10-04 1993-06-15 Ngk Insulators Ltd Molding method for ceramic port liner
FR2907705A1 (en) * 2006-10-25 2008-05-02 Elmeceram Sa Ceramic container fabricating method, involves introducing slurry under pressure inside mold, avoiding penetrating appendage in space delimited by lateral walls to subsist excess slurry inside mold, and aspirating excess slurry
KR100861881B1 (en) * 2007-01-12 2008-10-09 한국생명공학연구원 Detection kit for infection by measuring the expression of gram positive bacteria or gram negative bacteria infection marker genes

Also Published As

Publication number Publication date
JPH052486B2 (en) 1993-01-12

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