JPH0195863A - Production of cylinder head for internal combustion engine - Google Patents
Production of cylinder head for internal combustion engineInfo
- Publication number
- JPH0195863A JPH0195863A JP62251257A JP25125787A JPH0195863A JP H0195863 A JPH0195863 A JP H0195863A JP 62251257 A JP62251257 A JP 62251257A JP 25125787 A JP25125787 A JP 25125787A JP H0195863 A JPH0195863 A JP H0195863A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder head
- valve seat
- alloy
- valve
- casting
- 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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 19
- 238000005507 spraying Methods 0.000 claims description 2
- 239000000956 alloy Substances 0.000 abstract description 10
- 229910045601 alloy Inorganic materials 0.000 abstract description 9
- 238000007751 thermal spraying Methods 0.000 abstract description 6
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 5
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000007750 plasma spraying Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は内燃機関用シリンダヘッドの製造方法に関する
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a cylinder head for an internal combustion engine.
（従来の技術）
内燃機関用シリンダヘッドの、バルブフェースと接触す
るシート部分には、高い耐摩耗性が要求されている。こ
のため、従来より該部分に、バルブシートとして、例え
ば第２図に示すようなシートリング７を適用している。(Prior Art) A seat portion of a cylinder head for an internal combustion engine that comes into contact with a valve face is required to have high wear resistance. For this reason, conventionally, a seat ring 7 as shown in FIG. 2, for example, has been applied as a valve seat to this portion.
このようなシリンダヘッド６′は、まず、アルミ合金、
鋳鉄等によりシリンダヘッド本体３を作製した後、バル
ブ８のバルブフェース９と接触する部分に溝を彫り、該
溝に、予め耐摩耗性に優れる材料で製造したシートリン
グ７を嵌め込むことにより製造されている。シートリン
グを有するシリンダヘッドの構成は、例えば特開昭６１
−２２９９２６号及び特開昭６０−１９０６４８号に記
載されている。Such a cylinder head 6' is first made of aluminum alloy,
After the cylinder head body 3 is made of cast iron or the like, a groove is carved in the part of the valve 8 that contacts the valve face 9, and a seat ring 7 made of a material with excellent wear resistance is fitted into the groove. has been done. The structure of a cylinder head having a seat ring is disclosed in, for example, JP-A-61
-229926 and JP-A-60-190648.
（発明が解決しようとする問題点）
しかしながら、上記の方法は、シートリングの製造工程
、シートリングを嵌め込むための溝の研削工程、シート
リングの嵌め込み工程を必要とするため、工程数が多く
なり、製造に長時間を要する。また、シートリングとシ
リンダヘッドとの密着性が悪いため、作動中にシートリ
ングが剥離しやすいという問題がある。また、密着性が
悪く、しかもシートリングの厚さが約１０ｍｍと厚いた
め、熱分布が不均一になり、特にシートリング７及びバ
ルブフェース９の温度が高くなるという問題がある。こ
れによって、シートリングが破損したり、歪んだりする
ことにより、燃焼室１０がバルブ８により完全に閉じな
くなることもある。このため、バルブシートのないシリ
ンダヘッドも考えられてはいるが、バルブシートなしに
耐摩耗性を改善するのは非常に困難である。(Problems to be Solved by the Invention) However, the above method requires a manufacturing process of the seat ring, a process of grinding a groove for fitting the seat ring, and a process of fitting the seat ring, and therefore requires a large number of processes. Therefore, it takes a long time to manufacture. Furthermore, since the adhesion between the seat ring and the cylinder head is poor, there is a problem in that the seat ring is likely to peel off during operation. Furthermore, since the adhesion is poor and the seat ring is thick, about 10 mm, there is a problem that the heat distribution becomes uneven, and the temperature of the seat ring 7 and the valve face 9 becomes particularly high. As a result, the seat ring may be damaged or distorted, and the combustion chamber 10 may not be completely closed by the valve 8. For this reason, cylinder heads without valve seats have been considered, but it is extremely difficult to improve wear resistance without valve seats.
従って、本発明は耐摩耗性が高く、しかもヘッドとバル
ブシートを別途に製造して嵌め込むというような多工程
を要さず、また、バルブシートとシリンダヘッドとの密
着性が高く、バルブシートの剥離や過熱を来すことのな
い内燃機関用シリンダヘッドの製造方法を提供すること
を目的とする。Therefore, the present invention has high wear resistance, does not require multiple steps such as manufacturing the head and valve seat separately and fitting them together, and has high adhesion between the valve seat and cylinder head. An object of the present invention is to provide a method for manufacturing a cylinder head for an internal combustion engine that does not cause peeling or overheating.
（問題点を解決するための手段）
上記の目的を達成するために、本発明の内燃機関用シリ
ンダヘッドの製造方法は、シリンダヘッド鋳造用の鋳型
の中子のバルブシート形成位置に相当する部分に、Ｃｕ
合金を溶射した後、シリンダヘッド本体の鋳造を行なう
ことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the method for manufacturing a cylinder head for an internal combustion engine of the present invention provides a method for manufacturing a cylinder head for an internal combustion engine, in which a portion of a core of a mold for casting a cylinder head corresponding to a valve seat forming position is In, Cu
It is characterized in that the cylinder head body is cast after the alloy is thermally sprayed.
従って、本発明においては、まず、シリンダヘッドの鋳
造用鋳型の中子に、プラズマ溶射等の方法によりＣｕ合
金を溶射し、その後シリンダヘッド本体を形成する金属
、例えばアルミニウム合金を注湯し、鋳造した後、脱型
し、これにバルブガイドを圧入し、パルプガイドの内面
と、バルブシートの当たり面を研削加工することにより
、Ｃｕ合金の溶射物によるバルブシートが形成されたシ
リンダヘッドを製造する。Therefore, in the present invention, first, a Cu alloy is thermally sprayed onto the core of a mold for casting a cylinder head by a method such as plasma spraying, and then a metal, such as an aluminum alloy, which will form the cylinder head body is poured into the core, and then cast. After that, the mold is removed, a valve guide is press-fitted into the mold, and the inner surface of the pulp guide and the contact surface of the valve seat are ground to produce a cylinder head with a valve seat made of Cu alloy sprayed material. .
合金の溶射は、通常、最終的なバルブシートの厚さが約
１ｍから数ｍｍ程度となるように行われる。Thermal spraying of the alloy is usually carried out so that the final valve seat thickness is on the order of about 1 m to several mm.
中子の一部に溶射するＣｕ合金としては、Ｎｉ５〜５０
重量％、Ｓｉ１〜１０重量％、８００５〜５重量％及び
少量のＦｅと残部Ｃｕからなる合金が、密着性の点で、
また耐摩耗性の点で非常に優れているため、好ましい。The Cu alloy to be thermally sprayed on a part of the core is Ni5-50.
In terms of adhesion, an alloy consisting of 1 to 10% by weight of Si, 8005 to 5% by weight, a small amount of Fe, and the balance Cu,
It is also preferred because it has excellent wear resistance.
上記のＣｕ合金の限定理由を下記に示す。以下、％は重
量による。The reasons for limiting the above Cu alloy are shown below. Below, percentages are by weight.
Ｎｉは、強度を上げるために添加されるが、５％未満で
は効果がなく、また５０％を超えると、シリンダヘッド
材との密着性が悪くなり、熱伝導性が悪くなるため、５
〜５０％とした。Ni is added to increase strength, but if it is less than 5% it has no effect, and if it exceeds 50%, the adhesion with the cylinder head material will deteriorate and the thermal conductivity will deteriorate.
~50%.
Ｓｉ及びＢは、シリサイドまたはホウ化物等の金属間化
合物を作って耐摩耗性を向上させるために添加されるが
、それぞれ１％未満及び０．５％未満では目的とする効
果が得られず、また、１０％及び５％を超えると、靭性
が低下するため、それぞれ１〜１０％及び０．５〜５％
とした。Si and B are added to form intermetallic compounds such as silicides or borides to improve wear resistance, but if they are less than 1% and 0.5%, respectively, the desired effect cannot be obtained. In addition, if it exceeds 10% and 5%, the toughness decreases, so 1 to 10% and 0.5 to 5%, respectively.
And so.
（作用）
本発明の内燃機関用シリンダヘッドの製造方法において
は、予め中子にＣｕ合金を溶射した後、シリンダヘッド
本体を鋳造することにより、シリンダヘッドにＣｕ合金
溶射層が鋳ぐるまれた形で鋳造される。Ｃｕ合金はシリ
ンダヘッドの基材となるアルミニウム合金または鋳鉄と
の密着性に優れており、しかも、溶射されたＣｕ合金表
面に凹凸が存在するため、予め製造されたバルブシート
を鋳ぐるんだ場合と比べても、シリンダヘッドとバルブ
シートとの密着性は著しく改善される。また、溶射によ
り形成する方法では、バルブシートを別途に製造する場
合に比べて、バルブシートの層厚を非常に薄くスルこと
ができる。従って、密着性の向上により、また、層厚が
薄くなったことにより、作動中のバルブシート及びシー
トリングの熱分布の偏りが改善され、バルブシート及び
バルブフェース部の温度が低下する。また、本発明にお
いてバルブシート材料として特に優れていることが見出
されたＣｕ合金材料を用いることにより、さらに優れた
耐摩耗性が達成される。(Function) In the method of manufacturing a cylinder head for an internal combustion engine according to the present invention, a Cu alloy is sprayed onto a core in advance, and then the cylinder head body is cast, so that the cylinder head is formed into a shape in which a Cu alloy sprayed layer is cast. It is cast in Cu alloy has excellent adhesion to aluminum alloy or cast iron, which is the base material of the cylinder head, and since there are irregularities on the surface of the thermally sprayed Cu alloy, when a pre-manufactured valve seat is cast. Even compared to the above, the adhesion between the cylinder head and the valve seat is significantly improved. Furthermore, with the method of forming by thermal spraying, the layer thickness of the valve seat can be made very thin compared to the case where the valve seat is manufactured separately. Therefore, due to the improved adhesion and the reduced layer thickness, the unevenness of the heat distribution of the valve seat and seat ring during operation is improved, and the temperature of the valve seat and valve face portion is reduced. Further, by using the Cu alloy material, which has been found to be particularly excellent as a valve seat material in the present invention, even better wear resistance can be achieved.
（実施例）
以下、本発明を実施例に基づいてさらに詳細に説明する
。(Examples) Hereinafter, the present invention will be explained in more detail based on Examples.
実施例１：
第１図は、本発明の方法により製造されたシリンダヘッ
ド６の一部を示す。Example 1: FIG. 1 shows a part of a cylinder head 6 manufactured by the method of the present invention.
該シリンダヘッド６の製造方法を以下に示す。A method for manufacturing the cylinder head 6 will be described below.
まず、Ｎｉ１５％、Ｓｉ３％、８１．５％、少量のＦｅ
及び残部Ｃｕからなる組成の合金を、シリンダヘッド鋳
造用鋳型の吸排気ボート部４のシエル中子に１％数ｍｍ
の厚さでプラズマ溶射して、溶射合金部２を形成する。First, 15% Ni, 3% Si, 81.5%, a small amount of Fe.
An alloy having a composition of 1% and the remainder Cu was added to the shell core of the intake/exhaust boat part 4 of the cylinder head casting mold to a thickness of several mm.
The sprayed alloy part 2 is formed by plasma spraying to a thickness of .
その後、アルミ合金ＡＣ２Ｃを上記の鋳型で鋳込んだ後
、鋳型より取り出し、中子を外す。得られたシリンダヘ
ッドにバルブガイド５を圧太し、バルブガイド５の内面
及びバルブシートの当たり面部１を加工して、シリンダ
ヘッド６を得る。After that, aluminum alloy AC2C is cast in the above mold, and then taken out from the mold and the core is removed. A valve guide 5 is compressed onto the obtained cylinder head, and the inner surface of the valve guide 5 and the contact surface 1 of the valve seat are processed to obtain a cylinder head 6.
比較のために、バルブシート嵌め込み型の従来例のシリ
ンダヘッドを製造する（比較測高１）。For comparison, a conventional cylinder head with a built-in valve seat was manufactured (comparative height measurement 1).
また、本発明品と同様の組成、即ちＮｉ１５％、Ｓｉ３
％、Ｂ１．５％、少量のＦｅ及び残部Ｃｕからなる合金
によりシートリングを製造し、これをシリンダヘッドに
鋳ぐるむ方法により、シリンダヘッドを製造した。（比
較測高２）。さらに、従来バルブシート嵌め込み型のシ
リンダヘッドにおいて、バルブシートを形成していたＣ
ｕ合金（Ｂｅ０．５％、Ｃｏ２．５％及び残部Ｃｕ）を
本発明の方法と同様の方法により中子に溶射した後、鋳
造を行なうことにより、シリンダヘッドを製造した（比
較測高３）。In addition, the product had the same composition as the product of the present invention, that is, 15% Ni, Si3
A cylinder head was manufactured by manufacturing a seat ring from an alloy consisting of 1.5% B, a small amount of Fe, and the balance Cu, and casting this into the cylinder head. (Comparative height measurement 2). Furthermore, in the conventional cylinder head with a built-in valve seat, C
A cylinder head was manufactured by spraying u alloy (0.5% Be, 2.5% Co, and the balance Cu) onto the core by a method similar to the method of the present invention, and then casting it (comparative height measurement 3). .
上記実施例で製造した本発明のシリンダヘッド並びに比
較測高１．２及び３について、６６００ｒｐｍ及び２０
０■のエンジン運転条件で運転した時のバルブシート温
度、はがれ発生率及びバルブシート当たり幅の増加量（
ｍｍ）を調べた。結果をそれぞれ第３図、第４図及び第
５図のグラフに示す。グラフより明らかなように、本発
明のシリンダヘッドは、従来方法のシートリングを嵌め
込む方法及びシートリングを鋳ぐるむ方法により製造さ
れたシリンダヘッドに比べて、運転時のバルブシート温
度が低い。また、本発明で製造されたシリンダヘッドの
バルブシート部は、従来方法のシートリングを鋳ぐるむ
方法により製造されたシリンダヘッドに比べて、剥がれ
発生率が低い。また、本発明で溶射されるＣｕ合金は、
従来例のＣｕ合金と比べて、耐摩耗性に優れていること
が明らかである。Regarding the cylinder head of the present invention manufactured in the above example and comparative height measurement 1.2 and 3, 6600 rpm and 20
Valve seat temperature, peeling occurrence rate, and increase in width per valve seat when operating under engine operating conditions of 0■
mm) was investigated. The results are shown in the graphs of FIGS. 3, 4, and 5, respectively. As is clear from the graph, the cylinder head of the present invention has a lower valve seat temperature during operation than cylinder heads manufactured by the conventional methods of fitting a seat ring and casting a seat ring. Furthermore, the valve seat portion of the cylinder head manufactured by the present invention has a lower rate of peeling than the cylinder head manufactured by the conventional method of casting a seat ring. Moreover, the Cu alloy to be thermally sprayed in the present invention is
It is clear that the wear resistance is superior to that of conventional Cu alloys.
（発明の効果）
本発明の内燃機関用シリンダヘッドの製造方法において
は、バルブシートをＣｕ合金の溶射により形成するため
、シートリングを別途に形成して嵌め込む方法に比べて
、工程数を減少することができ、製造時間を短縮するこ
とができる。また、本発明の方法により得られたシリン
ダヘッドは、バルブシートとシリンダヘッド本体との密
着性が高く、また、薄いバルブシートを形成することが
できる。従って、作動中にバルブシートの脱落を防止す
ることができる。また、バルブシート及びシートリング
の熱分布の偏りが改善されるため、バルブシート及びバ
ルブフェース部の温度が低下し、過熱による歪みまたは
損傷を防止することができる。また、耐摩耗性について
も、従来のバルブシート材料に比べて著しく改善される
。これにより、本発明においては、従来に比べて簡便な
方法により、耐久性に優れたシリンダヘッドを製造する
ことができる。(Effect of the invention) In the method for manufacturing a cylinder head for an internal combustion engine of the present invention, the valve seat is formed by thermal spraying of a Cu alloy, so the number of steps is reduced compared to a method in which a seat ring is separately formed and fitted. It is possible to shorten the manufacturing time. Further, the cylinder head obtained by the method of the present invention has high adhesion between the valve seat and the cylinder head body, and a thin valve seat can be formed. Therefore, it is possible to prevent the valve seat from falling off during operation. Furthermore, since the unevenness of the heat distribution of the valve seat and the seat ring is improved, the temperature of the valve seat and the valve face portion is reduced, and distortion or damage due to overheating can be prevented. The wear resistance is also significantly improved compared to conventional valve seat materials. As a result, in the present invention, a cylinder head with excellent durability can be manufactured by a simpler method than in the past.
第１図は本発明の一実施例の方法により製造されたシリ
ンダヘッドを示す図、第２図は従来方法により製造され
たシリンダヘッドを示す図、第３図、第４図及び第５図
は、それぞれ本発明のシリンダヘッドと比較測高のシリ
ンダヘッドの運転時のバルブシート温度、バルブシート
の剥がれ発生率及びバルブシートの当たり幅の増加量を
示すグラフである。
■・・・バルブ−シート部 ２・・・溶射合金部３・
・・シリンダヘッド本体 ６．６１・・・シリンダヘッ
ド特許出願人 トコタ自動車株式会社
く云ト、き−−Ｌ畷興 ｐ
く→゛い・・＼−−Ｌ＠Ｓ−登讐ε
た９≦摩繕脩 ｌ
、′Ｖ１
、きFIG. 1 is a diagram showing a cylinder head manufactured by a method according to an embodiment of the present invention, FIG. 2 is a diagram showing a cylinder head manufactured by a conventional method, and FIGS. 3, 4, and 5 are , which are graphs showing the valve seat temperature, the rate of occurrence of valve seat peeling, and the amount of increase in the contact width of the valve seat during operation of the cylinder head of the present invention and the comparative cylinder head, respectively. ■...Valve-seat part 2...Sprayed alloy part 3.
... Cylinder head body 6.61 ... Cylinder head patent applicant Tokota Jidosha Co., Ltd. Machining Shu l,'V1,ki
Claims (1)
位置に相当する部分に、Ｃｕ合金を溶射した後、シリン
ダヘッド本体の鋳造を行なうことからなる内燃機関用シ
リンダヘッドの製造方法。A method for manufacturing a cylinder head for an internal combustion engine, which comprises thermally spraying a Cu alloy onto a portion of a core of a cylinder head casting mold corresponding to a valve seat forming position, and then casting a cylinder head body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62251257A JPH0195863A (en) | 1987-10-05 | 1987-10-05 | Production of cylinder head for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62251257A JPH0195863A (en) | 1987-10-05 | 1987-10-05 | Production of cylinder head for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0195863A true JPH0195863A (en) | 1989-04-13 |
Family
ID=17220081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62251257A Pending JPH0195863A (en) | 1987-10-05 | 1987-10-05 | Production of cylinder head for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0195863A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0771938A1 (en) * | 1995-10-31 | 1997-05-07 | Toyota Jidosha Kabushiki Kaisha | Cylinder head for internal combustion engine |
| US6977343B2 (en) | 2000-05-18 | 2005-12-20 | Sony Corporation | Heat-sensitive material and heat-sensitive element |
-
1987
- 1987-10-05 JP JP62251257A patent/JPH0195863A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0771938A1 (en) * | 1995-10-31 | 1997-05-07 | Toyota Jidosha Kabushiki Kaisha | Cylinder head for internal combustion engine |
| US5829404A (en) * | 1995-10-31 | 1998-11-03 | Toyota Jidosha Kabushiki Kaisha | Cylinder head for internal combustion engine |
| US6977343B2 (en) | 2000-05-18 | 2005-12-20 | Sony Corporation | Heat-sensitive material and heat-sensitive element |
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