JPH08232618A - Insert molding method for engine valve seat - Google Patents
Insert molding method for engine valve seatInfo
- Publication number
- JPH08232618A JPH08232618A JP5975595A JP5975595A JPH08232618A JP H08232618 A JPH08232618 A JP H08232618A JP 5975595 A JP5975595 A JP 5975595A JP 5975595 A JP5975595 A JP 5975595A JP H08232618 A JPH08232618 A JP H08232618A
- Authority
- JP
- Japan
- Prior art keywords
- valve seat
- cylinder head
- mold
- valve
- core
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
- F02F1/36—Cylinder heads having cooling means for liquid cooling
- F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F2001/244—Arrangement of valve stems in cylinder heads
- F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F2200/00—Manufacturing
- F02F2200/06—Casting
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明はエンジンバルブシート
の鋳ぐるみ方法に係り、詳しくは、自動車エンジンに用
いられるバルブシートとシリンダヘッドとを一体的に接
合するための方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine valve seat casting method, and more particularly to a method for integrally joining a valve seat and a cylinder head used in an automobile engine.
【０００２】[0002]
【従来の技術】一般に、内燃機関のシリンダヘッドにお
いては、吸気弁が装着される吸気ポートと排気弁が装着
される排気ポートとの間は、吸入行程時の吸入空気によ
る冷却と、内燃機関の燃焼熱による加熱とにより、高い
熱応力を繰り返し生じている。このため、熱疲労が大き
くなり、この部位に亀裂を生じるおそれがある。2. Description of the Related Art Generally, in a cylinder head of an internal combustion engine, between an intake port to which an intake valve is mounted and an exhaust port to which an exhaust valve is mounted, cooling by intake air during an intake stroke and cooling of the internal combustion engine are performed. High heat stress is repeatedly generated by heating with combustion heat. For this reason, thermal fatigue becomes large, and there is a possibility that cracks may occur at this portion.
【０００３】そこで、従来、高耐熱強度を必要とする部
位に、高融点の耐熱金属を鋳ぐるんで、亀裂の発生を防
止する構造が提案されている。この構造は、吸気ポート
及び排気ポートの開口周縁部に装着されたバルブシート
の周囲に、耐熱金属を鋳ぐるむことにより、亀裂発生の
起点部位に、この耐熱金属を配置させて、亀裂の発生を
防止するようにしたものである。Therefore, conventionally, a structure has been proposed in which a refractory metal having a high melting point is cast around a portion requiring high heat resistance to prevent cracks from occurring. In this structure, a refractory metal is cast around the valve seats installed around the openings of the intake port and the exhaust port, so that the refractory metal is placed at the starting point of the crack and the crack is generated. Is to prevent.
【０００４】このようにバルブシートをシリンダに鋳ぐ
るむ方法としては、バルブシートを互いに一体に結着し
てアルミニウム製シリンダヘッドに鋳込むもの（特開昭
５８−７４２６５号公報、特開昭５８−７４２６６号公
報）がある。又、鉄系バルブシートを鋳鉄製シリンダヘ
ッドに鋳ぐるむもの（特開平１−１８２６１号公報）、
鉄系バルブシートを鋳鉄製シリンダヘッドに鋳ぐるむ際
に、バルブシート表面を浸炭処理することにより、バル
ブシートとシリンダヘッドとの結合性を向上させるもの
（特開平３−２１０９６１号公報）がある。As a method of casting the valve seat around the cylinder, the valve seats are integrally bonded to each other and cast into an aluminum cylinder head (Japanese Patent Laid-Open Nos. 58-74265 and 58-58). -74266). In addition, an iron-based valve seat is cast around a cast iron cylinder head (Japanese Patent Laid-Open No. 1-18261).
There is one that improves the bondability between the valve seat and the cylinder head by carburizing the surface of the valve seat when the iron-based valve seat is cast around the cast iron cylinder head (JP-A-3-210961). .
【０００５】又、アルミニウム製シリンダヘッドに鉄系
焼結材からなるバルブシートを鋳ぐるむ技術が実用化さ
れている。さらに、鋳ぐるむ方法以外にバルブシートを
シリンダヘッドに圧入する方法も種々提案されている。A technique for casting a valve seat made of an iron-based sintered material on an aluminum cylinder head has been put into practical use. In addition to the casting method, various methods of press-fitting the valve seat into the cylinder head have been proposed.
【０００６】[0006]
【発明が解決しようとする課題】ところが、特開昭５８
−７４２６５号、特開昭５８−７４２６６号等の技術
や、アルミニウム製シリンダヘッドに鉄系焼結材からな
るバルブシートを鋳ぐるむ技術は、バルブシートとシリ
ンダヘッドが金属的には結合されておらず、バルブシー
ト、シリンダヘッド間に隙間が存在する。そのため、熱
伝導が悪く、バルブシート温度が低減できず、耐ノック
性が低下する。又、バルブシートとシリンダヘッド間の
結合強度も低いという問題がある。However, Japanese Patent Laid-Open No. 58-58
-74265, JP-A-58-74266 and the like, and the technique of casting a valve seat made of an iron-based sintered material around an aluminum cylinder head, the valve seat and the cylinder head are metallically combined. There is a gap between the valve seat and the cylinder head. Therefore, heat conduction is poor, the valve seat temperature cannot be reduced, and knock resistance is reduced. Further, there is a problem that the coupling strength between the valve seat and the cylinder head is low.
【０００７】又、圧入方法は圧入代が必要となり、バル
ブシートが厚くなる問題があり、その結果、吸排気径が
小さくなり、出力、燃費が悪くなるとともに、シート座
面加工も必要である。Further, the press-fitting method requires a press-fitting margin, which causes a problem that the valve seat becomes thick. As a result, the intake / exhaust diameter becomes small, the output and the fuel consumption are deteriorated, and the seat seat surface needs to be machined.
【０００８】この発明の目的は上記従来技術の問題点を
解消することにあり、より具体的にはバルブシートとシ
リンダヘッド間を金属充填結合させることにより、熱伝
導効率が良く、バルブシート温度を低減でき、耐ノック
性を向上することができるエンジンバルブシートの鋳ぐ
るみ方法を提供することにある。An object of the present invention is to eliminate the above-mentioned problems of the prior art. More specifically, the valve seat and the cylinder head are metal-filled and bonded, so that the heat conduction efficiency is good and the valve seat temperature is improved. It is an object of the present invention to provide a method for making cast engines for engine valve seats that can be reduced and improved in knock resistance.
【０００９】[0009]
【課題を解決するための手段】上記問題点を解決するた
めに請求項１の発明は、アルミニウム製シリンダヘッド
に鉄系材料からなるバルブシートを鋳ぐるむ鋳ぐるみ方
法において、フッ化物系フラックスをバルブシートに塗
布した後に鋳ぐるむことをその要旨としている。従来、
バルブシートをアルミニウム製シリンダヘッドに金属結
合を介した鋳ぐるみができなかった理由は、アルミニウ
ム溶湯を鋳型に注入したとき、バルブシート／シリンダ
ヘッド界面に鉄やアルミニウムの酸化物が存在し、それ
らを除去できなかったことによる。この発明で使用する
フッ化物系フラックスは、これらの酸化物を除去するた
めのものであり、アルミニウム製シリンダヘッドを腐食
させないアルミ用非腐食性を有するものが適当である。
この種のものとしては、ＫＦ−ＡｌＦ3 系、ＣｓＦ−Ａ
ｌＦ3 系、ＫＦ−ＣｓＦ−ＡｌＦ3 、ＣｓＦ−ＡｌＦ3
−Ａｌ（ＯＨ）3 、ＫＦ−ＡｌＦ3 −ＬｉＦ、ＣｓＦ−
ＡｌＦ3 −ＬｉＦ等を挙げることができる。この種のフ
ラックスは塩化物を含まないため、バルブシートやシリ
ンダヘッドを腐食させることはない。この塗布方法は、
フッ化物系フラックスをエチルアルコール等の溶媒に分
散させて、そこにバルブシートを浸漬するのが簡便であ
り、素早く乾燥でき、均一に塗布できるため好ましい
が、この塗布方法に限定されるものではない。SUMMARY OF THE INVENTION In order to solve the above problems, the invention of claim 1 uses a fluoride-based flux in a cast-in method in which a valve seat made of an iron-based material is cast around an aluminum cylinder head. The gist of this is to cast the valve seat after applying it. Conventionally,
The reason why the valve seat could not be cast into the aluminum cylinder head through metal bonding was that when the molten aluminum was poured into the mold, oxides of iron and aluminum were present at the valve seat / cylinder head interface, Because it could not be removed. The fluoride-based flux used in the present invention is for removing these oxides, and a non-corrosive aluminum flux that does not corrode the aluminum cylinder head is suitable.
Examples of this type include KF-AlF 3 system, CsF-A
lF 3 system, KF-CsF-AlF 3, CsF-AlF 3
-Al (OH) 3, KF- AlF 3 -LiF, CsF-
AlF 3 -LiF, and the like can be given. Since this type of flux does not contain chloride, it does not corrode the valve seat or cylinder head. This application method is
It is preferable to disperse the fluoride-based flux in a solvent such as ethyl alcohol and immerse the valve seat therein, which is preferable because it can be dried quickly and can be uniformly applied, but the application method is not limited to this. .
【００１０】鋳ぐるみ時において、バルブシートとシリ
ンダヘッドの金属結合は可能であるが、鋳ぐるみ時にバ
ルブシート／シリンダヘッド界面に脆い鉄・アルミニウ
ム金属間化合物が生成するため、この生成を抑制するた
めに、バルブシート表面にバルブシート及びシリンダヘ
ッドに対して親和性の良い金属であり、鉄、アルミニウ
ム以外の金属をコーティングすることが好ましい。Although the valve seat and the cylinder head can be metal-bonded with each other during casting, a brittle iron-aluminum intermetallic compound is formed at the interface between the valve seat and the cylinder head during casting, so that this formation is suppressed. In addition, it is preferable to coat the surface of the valve seat with a metal having a good affinity for the valve seat and the cylinder head, and a metal other than iron and aluminum.
【００１１】従って、請求項２の発明は、請求項１にお
いて、フッ化物系フラックス塗布前にバルブシート表面
にバルブシート及びシリンダヘッドに対して親和性の良
い金属をコーティングすることをその要旨としている。Therefore, the gist of the invention of claim 2 is that, in claim 1, the surface of the valve seat is coated with a metal having a good affinity for the valve seat and the cylinder head before applying the fluoride flux. .
【００１２】このバルブシート及びシリンダヘッドに対
して親和性の良い金属としては、ニッケル、銅、亜鉛、
クロム等があり、その中でもニッケル、銅は鉄・アルミ
ニウム金属間化合物の生成を抑制する効果が大きく、コ
ストが安く望ましい。Metals having a good affinity for the valve seat and the cylinder head include nickel, copper, zinc,
There are chromium and the like, and among them, nickel and copper have a large effect of suppressing the formation of the iron-aluminum intermetallic compound, and are inexpensive and desirable.
【００１３】又、このコーティングの方法としては、無
電解メッキ、電気メッキ、溶融メッキ、蒸着、スパッタ
リング、ＣＶＤ、溶射等がある。鋳ぐるみ方法は、下型
にチャンバ中子を納め、チャンバ中子の所定位置に前記
のようにフッ化物系フラックスを塗布したバルブシート
を、或いはニッケルをコーティングした後フッ化物系フ
ラックスを塗布したバルブシートをセットする。そし
て、ポート中子、ウォータジャケット中子等のように必
要な中子を所定位置に納めた後、上型をかぶせて鋳型を
完成する。この鋳型にアルミニウム溶湯を注入し、冷却
後、鋳型をばらすことにより、バルブシートを鋳ぐるみ
したシリンダヘッドが製造される。As the coating method, there are electroless plating, electroplating, hot dipping, vapor deposition, sputtering, CVD, thermal spraying and the like. As for the cast stuffing method, the chamber core is housed in the lower mold, and the valve seat coated with the fluoride-based flux as described above is placed at a predetermined position of the chamber core, or the valve coated with nickel and then coated with the fluoride-based flux. Set the sheet. Then, after the necessary cores such as the port core and the water jacket core are stored at predetermined positions, the upper mold is covered to complete the mold. A cylinder head having a cast valve seat is manufactured by pouring molten aluminum into the mold, cooling the mold, and then separating the mold.
【００１４】[0014]
【作用】請求項１の発明では、鋳ぐるみされたバルブシ
ートは、フッ化物系フラックスにより、アルミニウム製
シリンダヘッドに対して金属結合される。バルブシート
とシリンダヘッド間が金属充填されているため、接合面
積が大となり、バルブシートの熱伝導効率が良くなる。
又、フッ化物系フラックスは塩化物を含まないため、バ
ルブシートやシリンダヘッドを腐食させることはない。In the invention of claim 1, the cast-in valve seat is metal-bonded to the aluminum cylinder head by the fluoride flux. Since the space between the valve seat and the cylinder head is filled with metal, the joint area becomes large and the heat transfer efficiency of the valve seat improves.
Further, since the fluoride-based flux does not contain chloride, it does not corrode the valve seat or the cylinder head.
【００１５】請求項２の発明では、バルブシート表面に
コーティングした金属が、鉄系材料のバルブシートとア
ルミニウム製のシリンダヘッドとの間に介在するため、
鉄系材料とアルミニウムとが反応しにくい。従って、バ
ルブシート／シリンダ界面に脆い鉄・アルミニウム金属
間化合物の生成が抑制され、アルミニウム溶湯との濡れ
性も向上し、さらに金属結合が十分に行える。According to the second aspect of the present invention, the metal coated on the surface of the valve seat is interposed between the valve seat made of an iron material and the cylinder head made of aluminum.
It is difficult for iron-based materials to react with aluminum. Therefore, the generation of brittle iron-aluminum intermetallic compounds at the valve seat / cylinder interface is suppressed, the wettability with the molten aluminum is improved, and moreover, metal bonding can be sufficiently performed.
【００１６】[0016]
【実施例】以下、本発明を具体化した一実施例を図１〜
図４に従って説明する。まず、バルブシート１が鋳ぐる
みされた状態から説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. First, the state in which the valve seat 1 is cast and cast will be described.
【００１７】図３はバルブシート１がシリンダヘッド２
の排気ポート３の開口部において接合された状態を示し
ている。シリンダヘッド２はＡｌ−Ｓｉ系合金から鋳造
されており、排気ポート３の開口には接合段部４が環状
に形成されている。その接合段部４に対して環状に形成
されたバルブシート１が鋳ぐるみ固定されている。In FIG. 3, the valve seat 1 is a cylinder head 2
It shows a state in which they are joined at the opening of the exhaust port 3. The cylinder head 2 is cast from an Al—Si alloy, and a joint step 4 is formed in an annular shape at the opening of the exhaust port 3. The valve seat 1 formed in an annular shape is fixed to the joining step portion 4 as a casting.
【００１８】次に、上記のように鋳ぐるみされるバルブ
シート１の鋳ぐるみ法を図２に従って説明する。前記バ
ルブシート１はＣｒ，Ｎｉ，Ｃｏ，Ｍｏ等の合金元素を
含有した鉄系焼結合金から構成されている。まず、図１
に示すようにバルブシート１の表面、特に接合面となる
外周面及び底面にはＮｉ−Ｐ無電解メッキを施し、５μ
m 程度のニッケル層１ａをコーティングした。次に、５
５mol% ＣｓＦ−４５mol% ＡｌＦ3 なる組成のフッ化
物フラックスをエチルアルコール溶媒に分散させ、この
分散したフッ化物フラックスをバルブシート１の表面に
対して、塗布した。Next, a method of forming the cast-in valve seat 1 as described above will be described with reference to FIG. The valve seat 1 is made of an iron-based sintered alloy containing alloy elements such as Cr, Ni, Co and Mo. First, FIG.
As shown in Fig. 5, the surface of the valve seat 1, especially the outer peripheral surface and the bottom surface which are the joint surfaces, is Ni-P electroless plated and
A nickel layer 1a of about m 2 was coated. Next, 5
A fluoride flux having a composition of 5 mol% CsF-45 mol% AlF 3 was dispersed in an ethyl alcohol solvent, and the dispersed fluoride flux was applied to the surface of the valve seat 1.
【００１９】次に、図２に示すように、下型５にチャン
バ中子６を納め、チャンバ中子６の所定位置に前記のよ
うにフッ化物系フラックスを塗布したバルブシート１を
セットした。そして、ポート中子７、ウォータジャケッ
ト中子８等のように必要な中子１３及びバルブガイド穴
形成ピン１４を所定位置に納めた後、上型９をかぶせて
鋳型１１を完成する。なお、１０は上型９と下型５間に
介在配置した中型、１２は下型５に形成された溶湯注入
路である。Next, as shown in FIG. 2, the chamber core 6 was placed in the lower mold 5, and the valve seat 1 coated with the fluoride flux as described above was set at a predetermined position of the chamber core 6. Then, after the necessary cores 13 such as the port core 7, the water jacket core 8 and the like and the valve guide hole forming pins 14 are set in predetermined positions, the upper mold 9 is covered to complete the mold 11. In addition, 10 is a middle die interposed between the upper die 9 and the lower die 5, and 12 is a molten metal injection passage formed in the lower die 5.
【００２０】この鋳型１１の湯周りを良くするために、
鋳型の温度を４５０℃に加熱し、その後、７００℃のＡ
Ｃ２Ｂ（ＪＩＳ規格）アルミニウム溶湯を溶湯注入路１
２を介して注入した。そして、冷却後、鋳型１１をばら
すことにより、バルブシート１を鋳ぐるみしたシリンダ
ヘッド２を得た。In order to improve the water around the mold 11,
The temperature of the mold is heated to 450 ° C and then 700 ° C of A
C2B (JIS standard) molten aluminum injection path 1
Injected via 2. Then, after cooling, the mold 11 was disassembled to obtain the cylinder head 2 in which the valve seat 1 was cast.
【００２１】この方法で得られたシリンダヘッド２の弁
座部を切断したところ、図４に示すように、鉄系焼結材
からなるバルブシート１とアルミニウム鋳物からなるシ
リンダヘッド２がその界面において金属結合しているこ
とが確認された。When the valve seat portion of the cylinder head 2 obtained by this method was cut, as shown in FIG. 4, the valve seat 1 made of an iron-based sintered material and the cylinder head 2 made of an aluminum casting were in the interface. It was confirmed that they were metal-bonded.
【００２２】又、バルブシート１の表面には、ニッケル
層１ａがコーティングされているため、脆い鉄−アルミ
ニウム金属間化合物は生成していないことが確認され
た。なお、この発明は前記実施例に限定されるものでは
なく、下記のように実施してもよい。 （イ）バルブシート表面の金属コーティングニツケル以
外に銅、亜鉛、クロム等でも良い。It was also confirmed that since the surface of the valve seat 1 was coated with the nickel layer 1a, no brittle iron-aluminum intermetallic compound was formed. The present invention is not limited to the above embodiment, but may be carried out as follows. (A) In addition to the nickel coating on the valve seat surface, copper, zinc, chrome, etc. may be used.
【００２３】前記実施例に基づき特許請求の範囲以外に
把握される技術的思想をその効果とともに記載する。 （１）フッ化物系フラックスの塗布は、フッ化物系フラ
ックスを有機溶媒に分散した分散液中にバルブシートを
浸漬するものである請求項１又は請求項２に記載のエン
ジンバルブシートの鋳ぐるみ方法。この方法によれば、
フッ化物系フラックスを簡便に塗布できるとともに、素
早く乾燥でき、均一に塗布できる。Based on the above-mentioned embodiment, the technical idea grasped outside the scope of the claims will be described together with its effect. (1) The method of casting the engine valve seat according to claim 1 or 2, wherein the application of the fluoride-based flux is performed by immersing the valve seat in a dispersion liquid in which the fluoride-based flux is dispersed in an organic solvent. . According to this method
Fluoride-based flux can be applied easily, can be dried quickly, and can be applied uniformly.
【００２４】[0024]
【発明の効果】以上詳述したように、請求項１の発明に
よれば、バルブシートとシリンダヘッド間が金属充填結
合しているため、熱伝導効率が良く、バルブシート温度
を低減できる。そして、バルブシートの温度低下によ
り、耐ノック性を向上することができる。又、圧入バル
ブシートと比較してバルブシートの圧入代が不要となる
ため、バルブシートの肉厚を薄くでき、吸気・排気弁の
径を大きくすることができ、充填効率の向上により、出
力・燃費向上を図ることができる。バルブシートの肉厚
を薄くできることにより、バルブシート材料費の低減を
図ることもできる。フッ化物系フラックスは塩化物を含
まないため、バルブシートやシリンダヘッドを腐食させ
ることはない。As described above in detail, according to the first aspect of the invention, the valve seat and the cylinder head are metal-filled and bonded, so that the heat transfer efficiency is good and the valve seat temperature can be reduced. The knock resistance can be improved due to the temperature decrease of the valve seat. In addition, since the press-fitting margin of the valve seat is unnecessary compared to the press-fitting valve seat, the thickness of the valve seat can be reduced, the diameter of the intake / exhaust valve can be increased, and the filling efficiency can be improved. It is possible to improve fuel efficiency. By reducing the thickness of the valve seat, it is possible to reduce the cost of the valve seat material. Since the fluoride-based flux does not contain chloride, it does not corrode the valve seat or cylinder head.
【００２５】請求項２の発明では、請求項１の効果に加
えて、鋳ぐるみ時にバルブシート／シリンダヘッド界面
に脆い鉄・アルミニウム金属間化合物の生成を抑制で
き、アルミニウム溶湯との濡れ性も向上し、さらに金属
結合が十分に行うことができる。According to the invention of claim 2, in addition to the effect of claim 1, generation of brittle iron-aluminum intermetallic compound at the interface of the valve seat / cylinder head during casting can be suppressed, and wettability with molten aluminum is also improved. In addition, metal bonding can be sufficiently performed.
【図面の簡単な説明】[Brief description of drawings]
【図１】 実施例のバルブシートの拡大要部半断面図。FIG. 1 is a half sectional view of an enlarged main part of a valve seat according to an embodiment.
【図２】 同じく、鋳型の断面図。FIG. 2 is likewise a sectional view of the mold.
【図３】 シリンダヘッドの排気ポート付近の断面図。FIG. 3 is a sectional view of the vicinity of an exhaust port of a cylinder head.
【図４】 弁座部における金属組織を示す顕微鏡写真。FIG. 4 is a micrograph showing a metal structure in a valve seat portion.
１…バルブシート、１ａ…ニッケル層、２…シリンダヘ
ッド、３…排気ポート、４…接合段部。1 ... Valve seat, 1a ... Nickel layer, 2 ... Cylinder head, 3 ... Exhaust port, 4 ... Joining step.
Claims (2)
料からなるバルブシートを鋳ぐるむ鋳ぐるみ方法におい
て、 フッ化物系フラックスをバルブシートに塗布した後に鋳
ぐるむことを特徴とするエンジンバルブシートの鋳ぐる
み方法。Claim: What is claimed is: 1. An engine valve seat casting method according to claim 1, wherein a valve seat made of an iron-based material is cast around an aluminum cylinder head, the casting process being performed after the fluoride-based flux is applied to the valve seat. The toy way.
ート表面にバルブシート及びシリンダヘッドに対して親
和性の良い金属をコーティングすることを特徴とする請
求項１に記載のエンジンバルブシートの鋳ぐるみ方法。2. The method of casting the engine valve seat according to claim 1, wherein the valve seat surface is coated with a metal having a good affinity for the valve seat and the cylinder head before applying the fluoride flux. .
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5975595A JPH08232618A (en) | 1995-02-22 | 1995-02-22 | Insert molding method for engine valve seat |
| US08/534,611 US5802716A (en) | 1994-09-30 | 1995-09-27 | Method for bonding a valve seat with a cylinder head |
| DE69502368T DE69502368T2 (en) | 1994-09-30 | 1995-09-29 | Method of connecting a valve seat ring to a cylinder head |
| EP95115422A EP0705960B1 (en) | 1994-09-30 | 1995-09-29 | A method for bonding a valve seat with a cylinder head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5975595A JPH08232618A (en) | 1995-02-22 | 1995-02-22 | Insert molding method for engine valve seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08232618A true JPH08232618A (en) | 1996-09-10 |
Family
ID=13122397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5975595A Pending JPH08232618A (en) | 1994-09-30 | 1995-02-22 | Insert molding method for engine valve seat |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08232618A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2769527A1 (en) * | 1997-10-10 | 1999-04-16 | Renault | Production of cylinder head for internal combustion engine |
| JP2003053508A (en) * | 2001-08-14 | 2003-02-26 | Nissan Motor Co Ltd | Heat-conductive cylindrical member and its producing method, and aluminum alloy-made engine using heat- conductive cylindrical member |
| JP2004136350A (en) * | 2002-10-18 | 2004-05-13 | Nippon Piston Ring Co Ltd | Valve seat for casting insert of light metal alloy |
| JP2009544471A (en) * | 2006-07-28 | 2009-12-17 | カーエス・アルミニウム−テヒノロギー・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Flux and method for reducing oxide layers on metal surfaces |
| DE102010030114A1 (en) | 2009-08-11 | 2011-02-17 | Evonik Degussa Gmbh | Aqueous silane system for blank corrosion protection and corrosion protection |
| CN110791750A (en) * | 2019-10-15 | 2020-02-14 | 中北大学 | Method for improving bonding strength of aluminum-steel bimetal solid-liquid composite casting interface |
-
1995
- 1995-02-22 JP JP5975595A patent/JPH08232618A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2769527A1 (en) * | 1997-10-10 | 1999-04-16 | Renault | Production of cylinder head for internal combustion engine |
| WO1999019100A1 (en) * | 1997-10-10 | 1999-04-22 | Renault | Method and core for producing by moulding process an internal combustion engine cylinder head |
| JP2003053508A (en) * | 2001-08-14 | 2003-02-26 | Nissan Motor Co Ltd | Heat-conductive cylindrical member and its producing method, and aluminum alloy-made engine using heat- conductive cylindrical member |
| JP2004136350A (en) * | 2002-10-18 | 2004-05-13 | Nippon Piston Ring Co Ltd | Valve seat for casting insert of light metal alloy |
| JP2009544471A (en) * | 2006-07-28 | 2009-12-17 | カーエス・アルミニウム−テヒノロギー・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Flux and method for reducing oxide layers on metal surfaces |
| DE102010030114A1 (en) | 2009-08-11 | 2011-02-17 | Evonik Degussa Gmbh | Aqueous silane system for blank corrosion protection and corrosion protection |
| DE102010030111A1 (en) | 2009-08-11 | 2011-02-17 | Evonik Degussa Gmbh | Aqueous silane systems for blank corrosion protection and corrosion protection of metals |
| DE102010030115A1 (en) | 2009-08-11 | 2011-02-17 | Evonik Degussa Gmbh | Glycidyloxyalkylalkoxysilane-based aqueous silane systems for blank corrosion protection and corrosion protection of metals |
| CN110791750A (en) * | 2019-10-15 | 2020-02-14 | 中北大学 | Method for improving bonding strength of aluminum-steel bimetal solid-liquid composite casting interface |
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