JPH052486B2 - - Google Patents

Info

Publication number
JPH052486B2
JPH052486B2 JP25765687A JP25765687A JPH052486B2 JP H052486 B2 JPH052486 B2 JP H052486B2 JP 25765687 A JP25765687 A JP 25765687A JP 25765687 A JP25765687 A JP 25765687A JP H052486 B2 JPH052486 B2 JP H052486B2
Authority
JP
Japan
Prior art keywords
water
impermeable
ceramic
valve hole
mold
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
Application number
JP25765687A
Other languages
Japanese (ja)
Other versions
JPH0199805A (en
Inventor
Toshuki Hamanaka
Setsu Harada
Fumio Hatsutori
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 EP88309526A priority patent/EP0312322B1/en
Priority to DE3888279T priority patent/DE3888279T2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Producing Shaped Articles From Materials (AREA)

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、デイーゼルエンジ
ン等の排気ポートの内面をライニングするために
用いられるセラミツクポートナイナーの製造方法
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 of manufacturing a ceramic port niner 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ツク製の
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、ターボチヤージヤ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
下しやすい４バルブ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。このようなセラミツ
クポートライナーは石膏型のような吸水性の鋳型
の内部にセラミツクスラリーを流し込み、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
る排泥法スリツプキヤスト成形によつて成形する
ことができる。ところがセラミツクポートライナ
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つて正確な加工には多
大な手数を要すること、焼成後であつても脆いた
めにクラツ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 heat insulating effect increases the exhaust gas temperature, improving catalyst purification performance and reducing turbo charger turbo lag. It is considered to be an effective means, especially for 4-valve engines where the exhaust gas temperature tends to drop. Ceramic port liners of this type are formed by slip cast molding, a method in which ceramic slurry is poured into a water-absorbing mold such as a plaster mold, the material is deposited on the inner surface of the mold, and the excess slurry is discharged. can do. However, since it is necessary to drill valve holes in predetermined portions of ceramic port liners, conventionally the valves have been formed by machining using a drill or the like after molding or firing. However, since the processed surface is a curved surface, it takes time to process it, positioning is difficult and accurate processing requires a lot of effort, and even after firing it is brittle and easily cracks. 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ツクポー
トライナーを排泥法スリツプキヤストによつて容
易に製造することができるセラミツクポートライ
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 easily manufactures ceramic port liners in which valve holes are accurately formed by slip casting. 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） 上記の問題点を解決するためになされた第１の
発明は、吸水性の鋳型内表面のバルブ孔に対応す
る位置に不透水性のシールを貼付けることにより
不透水面を形成した吸水性の鋳型の内部にセラミ
ツ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
たセラミツ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 first invention made to solve the above problems is to affix a water-impermeable seal to the position corresponding to the valve hole on the inner surface of the water-absorbing mold. The ceramic slurry is poured into a water-absorbent mold in which a water-impermeable surface has been formed, and the portions excluding the water-impermeable surface are deposited to a desired thickness to obtain a ceramic port liner with holes in the valve holes. It is something to do.

また同一の問題点を解決するためになされた第
２の発明は、吸水性の鋳型内表面のバルブ孔に対
応する位置に不透水性の樹脂を埋め込むことによ
り不透水面を形成した吸水性の鋳型の内部にセラ
ミツ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
いたセラミツクポートライナーを得ることを特徴
とするものである。 In addition, a second invention made to solve the same problem is a water-absorbing mold in which a water-impermeable surface is formed by embedding a water-impermeable resin at a position corresponding to the valve hole on the inner surface of a water-absorbing mold. The method is characterized in that a ceramic slurry is poured into the mold, and the portions excluding the water-impermeable surface are deposited to a required thickness to obtain a ceramic port liner with holes in the valve hole portions.

（実施例） 以下にこれらの発明を図面を参照しつつ更に詳
細に説明する。(Example) These inventions will be described 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１，２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。
この吸水性の鋳型１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。第１の発明では鋳型内面
に例えばテフロン系の不透水性のシールを貼付け
ることにより不透水面４が形成されている。この
方法は例えば撥水剤を塗布する方法に比例して簡
便であり、しかも撥水性に優れた不透水面４を正
確な形状に形成することができる利点がある。 FIG. 1 shows water-absorbing molds 1 and 2 used in the present invention, and although plaster molds are usually used, water-absorbing resin molds can also be used.
A water-impermeable surface 4 having a shape corresponding to the valve hole is formed on the inner surface 3 of the water-absorbing mold 1 at a position corresponding to the valve hole. In the first invention, the water-impermeable surface 4 is formed by pasting a water-impermeable seal made of, for example, Teflon on the inner surface of the mold. This method is simpler than, for example, a method of applying a water repellent, and has the advantage that the water-impermeable surface 4 with excellent water repellency can be formed in an accurate shape.

また第２の発明では、吸水性の鋳型１の内表面
３のバルブ孔に対応する位置に不透水性の樹脂を
埋め込むことにより不透水面４を形成している。
この方法はシールを貼付ける方法に比較して簡便
性の点でやや劣るものの、撥水性に優れた不透水
面４を正確な形状に形成することができる利点が
ある。 In the second invention, the water-impermeable surface 4 is formed by embedding a water-impermeable resin in the inner surface 3 of the water-absorbing mold 1 at a position corresponding to the valve hole.
Although this method is slightly less convenient than the method of pasting a sticker, it has the advantage that the water-impermeable surface 4 with excellent water repellency can be formed in an accurate shape.

このようにして得られた不透水面４の持つ吸水
性の鋳型１，２を閉じ、その内部にセラミツクス
ラリーを流し込む。セラミツクスラリーの種類は
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。流し込まれたセラ
ミツクスラリーは吸水性の鋳型１，２の内表面に
接する部分で吸水され、次第に鋳型１，２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ツクスラリー
を排泥し、鋳型１，２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ツ
クポートライナー６を得ることができる。 The water-absorbing molds 1 and 2 of the water-impermeable surface 4 thus obtained are closed, and the ceramic slurry is poured into the molds. Although the type of ceramic slurry is not particularly limited, it is preferable to use an aluminum titanate type ceramic slurry. This is because this material has heat resistance and elastic modulus suitable for port liners. The poured ceramic slurry absorbs water at the portions in contact with the inner surfaces of the water-absorbing molds 1 and 2, and gradually builds up on the inside of the molds 1 and 2, but the water-impermeable surface 4 does not have this water-absorbing effect. Therefore, no fleshing occurs in this area. As a result, after the parts other than the impermeable surface 4 have been deposited to a predetermined thickness, the remaining ceramic slurry is removed and the molds 1 and 2 are opened. As shown in FIG. It is possible to obtain a ceramic port liner 6 having holes in the portion.

（作用） このようにして得られたセラミツクポートライ
ナー６は孔の周縁部分をわずかに修正すればよ
く、無孔のセラミツクポートライナーに機械加工
によつ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
加工によるクラツクも防止できる。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
必要とせ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つ
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。(Function) The thus obtained ceramic port liner 6 requires only slight modification of the periphery of the hole, compared to the conventional method in which valve holes are formed by machining in a non-porous ceramic port liner. The number of machining steps can be greatly reduced and cracks caused by machining can be prevented. Further, according to this method, the valve hole 5 can be formed in advance at an accurate position without requiring positioning of the valve hole 5 by machining, and the valve hole 5 can be formed freely on any curved surface. can. Furthermore, by adjusting the size of the water-impermeable surface 4, the dimensional accuracy of the valve hole 5 can 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シールの貼付けまたは樹脂
の埋め込みによつて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つて、正確な形
状にバルブ孔が形成されたセラミツクポートライ
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ツクポートラ
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 is simple in that a water-impermeable surface corresponding to the valve hole is formed by pasting a seal or embedding resin on the inner surface of a water-absorbing mold. Since it is possible to easily manufacture ceramic port liners with valve holes formed in an accurate shape by this method, this method contributes to the development of industry as a method for manufacturing ceramic port liners that eliminates conventional problems. The place is extremely large.

【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図は本発明によつて得られたセラミ
ツ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, and 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】 １ 吸水性の鋳型内表面のバルブ孔に対応する位
置に不透水性のシールを貼付けることにより不透
水面を形成した吸水性の鋳型の内部にセラミツク
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
ラミツクポートライナーを得ることを特徴とする
セラミツクポートライナーの製造方法。 ２ 吸水性の鋳型内表面のバルブ孔に対応する位
置に不透水性の樹脂を埋め込むことにより不透水
面を形成した吸水性の鋳型の内部にセラミツクス
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
ミツクポートライナーを得ることを特徴とするセ
ラミツクポートライナーの製造方法。[Claims] 1. Ceramic slurry is poured into a water-absorbing mold with an impermeable surface formed by pasting a water-impermeable seal at a position corresponding to the valve hole on the inner surface of the water-absorbing mold. A method for producing a ceramic port liner, which comprises depositing the material to a required thickness on a portion other than a water-permeable surface to obtain a ceramic port liner with holes in the valve hole portion. 2. Pour ceramic slurry into the inside of a water-absorbent mold, which has an impermeable surface formed by embedding water-impermeable resin in the position corresponding to the valve hole on the inner surface of the water-absorbent mold, and fill the areas excluding the water-impermeable surface with the required amount. A method for manufacturing a ceramic port liner, which is characterized by obtaining a ceramic port liner that is thickened and has holes in the valve hole portion.
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
EP88309526A EP0312322B1 (en) 1987-10-13 1988-10-12 Processes for producing hollow ceramic articles
DE3888279T DE3888279T2 (en) 1987-10-13 1988-10-12 Process for the production of ceramic hollow bodies.
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 JPH0199805A (en) 1989-04-18
JPH052486B2 true 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)

Families Citing this family (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
FR2907705B1 (en) * 2006-10-25 2009-01-16 Elmeceram Sa METHOD AND DEVICE FOR MANUFACTURING A CERAMIC CONTAINER
KR100861881B1 (en) * 2007-01-12 2008-10-09 한국생명공학연구원 Gram-positive bacteria or Gram-negative bacteria infection silkworm diagnostic kit

Also Published As

Publication number Publication date
JPH0199805A (en) 1989-04-18

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