JPS5877117A - Poppet valve - Google Patents
Poppet valveInfo
- Publication number
- JPS5877117A JPS5877117A JP17558581A JP17558581A JPS5877117A JP S5877117 A JPS5877117 A JP S5877117A JP 17558581 A JP17558581 A JP 17558581A JP 17558581 A JP17558581 A JP 17558581A JP S5877117 A JPS5877117 A JP S5877117A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- powder
- high hardness
- toughness
- transition metal
- 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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
- F01L3/04—Coated valve members or valve-seats
Abstract
Description
【発明の詳細な説明】
本発明は、きのこ駄弁、特に該弁のシート部に関する本
のであり。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mushroom valve, and particularly to a seat portion of the valve.
従来、ティーゼルエンジンバルプ、その他のエンジンバ
ルブ尋のきのこ駄弁のシート部には、耐熱、耐食、耐摩
耗性にすぐれ九ｏｏ −Ｏｒ −Ｗ系合金（通称ステラ
イト）または）ｉｉ −Ｏｒ −８１−Ｂ系合金（通称
コルモノイ）をバルブ本体に溶着内盛した材料が使用さ
れているが、これらの材料は、近都のエンジン燃料の粗
悪化、エンジン性能の向上によって、使用耐久時間が短
かくな抄、新しいシート部材の開発が望まれて−る。Conventionally, the seat portion of teasel engine valves and other engine valves has been made of 90-Or-W alloy (commonly known as Stellite) or ii-Or-81-B, which has excellent heat resistance, corrosion resistance, and wear resistance. Materials are used in which a type of alloy (commonly known as Colmonoy) is welded into the valve body, but due to the deterioration of the quality of engine fuel in nearby cities and the improvement of engine performance, these materials are becoming less durable due to their shorter service life. Therefore, the development of new sheet members is desired.
％に、 舶用エンジンバルブにおいては、エンジン燃料
油の粗悪化による吹きぬ社、エンジン発停の〈秒返し、
負荷の変動力どＫよって生じゐ割れが重大な問題となっ
てきてシリ、舶用エンジンバルブのシート部は、特に高
硬度で、かつ高靭性を同時に有するという極めて厳しい
性質が要求されてきている。%, in marine engine valves, due to deterioration of engine fuel oil, Bukinusha, engine start/stop times, etc.
Cracks caused by load fluctuations have become a serious problem, and the seat portions of marine engine valves are now required to have extremely strict properties, particularly high hardness and high toughness.
このうち吹き抜けは、バルブ作動中にシート面に咬み込
んだ燃焼残渣による圧痕（くぼみ）が連続して生ずるこ
とがわかっており、できるだけ硬度を高くして圧痕の生
成を抑制すればその発生を防止できる。一方、吹きぬけ
防止のために材料の硬変を高くすると、一般に高硬度な
本のほど靭性が低いため、熱応力中熱衝撃による割れが
増加すす。Among these, blow-through is known to occur continuously due to combustion residue biting into the seat surface during valve operation, and this can be prevented by suppressing the formation of indentations by increasing the hardness as much as possible. can. On the other hand, if the hardness of the material is increased to prevent blow-through, the higher the hardness of the material, the lower the toughness, which increases cracking due to thermal shock during thermal stress.
本発明は、上記の点Ｋｆ１１Ｍみ、４ＩＫ苛酷な条件下
において使用される舶用ディーゼルエンジンに最適なき
のこ駄弁を提供する本ので、勿論、舶用ディーゼルエン
ジンに限らず、他のエンジンに４適用できるきのこ駄弁
を提供するものである。In view of the above points, the present invention provides a mushroom valve that is most suitable for marine diesel engines used under 4IK severe conditions. It provides a lame excuse.
すなわち本発明は、高融点、高硬度の遷移金属炭化物粉
末と、同遷移金属炭化物よＩｔ高靭性の金属粉末との混
合粉末をバルブシート部として溶着させてなるきのこ駄
弁に関し、上記混合粉末を溶着させると、高靭性金属粉
末が溶融して基地となり、該基地中に高融点の九めに溶
融できない高硬度の遷移金属炭化物粉末が分散し九状態
のバルブシート部が構成される。このバルブシート部に
よれば、遷移金属炭化物粉末の分散により高硬度を保っ
て吹き抜けが防止され、高靭性金属の基地により割れが
防されるのである。That is, the present invention relates to a mushroom valve made by welding a mixed powder of a transition metal carbide powder having a high melting point and high hardness and a metal powder having high toughness from the same transition metal carbide as a valve seat part. As a result, the high toughness metal powder melts to form a base, and the highly hard transition metal carbide powder that cannot be melted at a high melting point is dispersed in the base to form a nine-state valve seat portion. According to this valve seat part, the dispersion of transition metal carbide powder maintains high hardness and prevents blow-through, and the high toughness metal base prevents cracking.
本発明で使用される高融点、高硬度の遷移金属炭化物と
しては、Ｍｌ）０％Ｔｏ 、ＴｉＯ等が挙げられ、高靭
性金属としては、Ｃｏ −Ｏｒ −Ｗ系合金、Ｍｌ−Ｏ
ｒ系合金、）ｉｉ −Ｏｒ −Ｂ −８１系合金尋が挙
げられる。Examples of high melting point, high hardness transition metal carbides used in the present invention include Ml)0%To, TiO, etc., and examples of high toughness metals include Co-Or-W alloy, Ml-O
Examples include r-based alloys, )ii-Or-B-81-based alloys.
上記の遷移金属炭化物粉末と高靭性金属粉末の混合割合
は、遷移金属炭化物粉末が混合粉末全体中４０〜７０％
を占めるようＫすることが好ましく、この混合割合で後
述する平均硬さおよび衝撃吸収エネルギー値を得ること
ができる。The mixing ratio of the above transition metal carbide powder and high toughness metal powder is such that the transition metal carbide powder accounts for 40 to 70% of the entire mixed powder.
It is preferable to use K so that K accounts for 100% of the average hardness and impact absorption energy values described below can be obtained at this mixing ratio.
第１図は、本発明きのこ駄弁の一実施態様例を示す図で
、弁棒本体１、弁座本体４および本発明に係るシート部
２，３から構成されている。FIG. 1 is a diagram showing an embodiment of the mushroom valve according to the present invention, which is composed of a valve stem body 1, a valve seat body 4, and seat parts 2 and 3 according to the present invention.
なお、図中の５は弁座を保持する弁−である。Note that 5 in the figure is a valve that holds the valve seat.
１１ｇ２図は、上記のシート部２．３の金属組織を光学
顕微鏡によって５０倍に拡大して撮影し九写真で、黒い
粒状のものが未溶融の遷移金属炭化物ここでｔｉＮｂｌ
：！ 、白い基地が溶融し友高靭性金属ここでｉｊ （
３ｏ −Ｏｒ −Ｗ系合金のステライト８２１である。Figure 11g2 is a photo of the metal structure of the sheet portion 2.3 magnified 50 times using an optical microscope. The black particles are unmelted transition metal carbides, where tiNbl
:! , the white base is melted and the tough metal is here ij (
Stellite 821 is a 3o-Or-W alloy.
なお、第２図のもののＮｂＣの混合率は約６０％で、平
均硬さ＃ｉＨマ９００、衝撃吸収エネルギーはｔ １
ｋｇ−ｗＶ′ｃ−であった。In addition, the mixture ratio of NbC in the one shown in Fig. 2 is about 60%, the average hardness is #iHma900, and the impact absorption energy is t1.
kg-wV'c-.
このような組成を有するシート部は、前記した吹抜けの
要因である圧痕の生成を基地中に分：′：・ス：
散させた高硬度のＭｂＣＫよって抑制し、熱応力。The sheet portion having such a composition suppresses the formation of indentations, which are the cause of the above-mentioned blow-through, by using high hardness MbCK dispersed in the base, and suppresses thermal stress.
熱衝撃による割れの発生は、基地を構成する上記Ｍｌ）
Ｏより高靭性のステライト２１で抑制することがてき、
きのこ駄弁、４＄に舶用ディーゼルエンジンパルプに要
求される高硬度、為靭性のシート部として適している。The occurrence of cracks due to thermal shock is caused by the above Ml) that constitutes the base.
It can be suppressed by Stellite 21, which has higher toughness than O.
Kinokodaben, $4, is suitable as a sheet part with the high hardness and toughness required for marine diesel engine pulp.
第３図は、上記の性能を実証するための実測値を示す図
表で、縦軸に耐久性を大きく左右するバルブシート部の
硬さ■と、横軸に衝撃吸収エネルギーエなパラメータと
してと秒、従来のパルプに関するデータａと本発明（＠
１．２図の本の）に関するデータｂを比較した龜のであ
る。同−硬さレベルで比較すれば、従来バルブシート部
にくらべ、本発明のバルブシート部は、はるかに衝撃吸
収エネルギーが犬きく、換言すれば、本発明によれば従
来パルプよりはるかに高硬度のシート部で構成され九き
のこ駄弁（エンジンパルプ）が提供でき、使用中の圧痕
の生成を抑制できるので、耐久性向上が実現できる。Figure 3 is a chart showing actual measured values to demonstrate the above performance.The vertical axis shows the hardness of the valve seat, which greatly affects durability, and the horizontal axis shows the impact absorption energy in seconds. , data a on conventional pulp and the present invention (@
This is a comparison of the data b for the book in Figure 1.2. If compared at the same hardness level, the valve seat part of the present invention has much higher impact absorption energy than the conventional valve seat part.In other words, the present invention has a much higher hardness than the conventional pulp. It is possible to provide a nine mushroom pulp (engine pulp) consisting of a sheet portion of 1,000 yen, and suppress the formation of impressions during use, thereby improving durability.
本発明きのこ駄弁の使用実績によれば、使用中の圧痕の
生成を＃１ぼ皆無にするためＫＦｉ、シート部の平均硬
さ１ｊＨｖ５０Ｇ〜９００が好ましく、ＨＶ５００以下
では、圧痕の生成を防止することけできな−。According to the experience of using the Kinokodaben of the present invention, in order to almost completely eliminate the formation of indentations during use, KFi, the average hardness of the seat portion is preferably 1 jHv 50G to 900, and if the HV is 500 or less, the formation of indentations can be prevented. I can't do it.
一方、使用中の熱応力および熱衝撃によるシート部の割
れ発生を防止するためＫＦｉ、シート部材の衝撃吸収エ
ネルギーをｔＯ〜ｔ ５ ｋｇ−ＶＯ２にすることが好
ましく、この値以下では割れ発生の危険がある。On the other hand, in order to prevent the occurrence of cracks in the seat part due to thermal stress and thermal shock during use, it is preferable that the shock absorption energy of KFi and the seat member be between tO and t5 kg-VO2; below this value, there is a risk of cracking. There is.
上記の平均硬さ、および衝撃吸収エネルギーを確保する
ことは、従来のバルブシート部材では極めて困難で、本
発明に係るバルブシート部（よってはじめて可能である
。It is extremely difficult to ensure the above average hardness and impact absorption energy with conventional valve seat members, and it is only possible with the valve seat part according to the present invention.
本発明斡のこ駄弁は、前述の如く、高硬度の遷移金属炭
化物の粉末と、これより高靭性の金属粉末とを一定の割
合で混合し、この混合粉末をパルプ本体へバルブシート
部として溶着させて、核シート部を高靭性金属の基地中
に高硬度の未溶融遷移金属炭化物を分散させた状態とし
テイルノで、高硬度でかつ高靭性のバルブシート部を有
する本のとなっており、使用中でのシート部表面の圧痕
の生成すなわち吹きぬけの生成と、シート部の割れ発生
を効果的に防止することができる。よって、本発明きの
こ駄弁は、高硬度、高靭性を同時ＫＩＩＩ求される舶用
ディーゼルエンジンバルブ、特に弁棒のシート部として
最適である。As mentioned above, the Koda valve of the present invention is made by mixing a high hardness transition metal carbide powder and a tougher metal powder at a certain ratio, and welding this mixed powder to the pulp body as a valve seat part. Then, the core seat part is made of a high-hardness unmelted transition metal carbide dispersed in a base of high-toughness metal, resulting in a valve seat part with high hardness and high toughness. It is possible to effectively prevent the formation of impressions on the surface of the seat portion, that is, the formation of blow-throughs, and the occurrence of cracks in the seat portion during use. Therefore, the mushroom valve of the present invention is most suitable for marine diesel engine valves that require both high hardness and high toughness, especially for the seat portion of the valve stem.
第１図は本発明きのこ駄弁の一実施態様例の構造を示す
一部値断側面図、第２図はそのシート部２．５の光学顕
微鏡組織写真（５０倍）、第５図は高度と靭性に一’）
Ｖｈて従来の本のと本発＃４きのこ駄弁とを比較して示
す実測値のグラフである。
後代理人 内 １） 明
復代理人 萩 原 亮 −Fig. 1 is a partial cross-sectional side view showing the structure of an embodiment of the mushroom valve according to the present invention, Fig. 2 is an optical micrograph of the sheet portion 2.5 (50x magnification), and Fig. 5 is the height and height. One' for toughness)
Vh is a graph of actual measured values comparing the conventional book and Honhatsu #4 Kinoko Daben. Sub-agent 1) Meifuku agent Ryo Hagiwara -
Claims (1)
化物よｔ）４高靭性の金属粉末との混合粉末をバルブシ
ート部として溶着させてなるきのこ駄弁。A mushroom valve made by welding a mixed powder of a high melting point, high hardness transition metal carbide powder and a high toughness metal powder as a valve seat part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17558581A JPS5877117A (en) | 1981-11-04 | 1981-11-04 | Poppet valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17558581A JPS5877117A (en) | 1981-11-04 | 1981-11-04 | Poppet valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5877117A true JPS5877117A (en) | 1983-05-10 |
Family
ID=15998650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17558581A Pending JPS5877117A (en) | 1981-11-04 | 1981-11-04 | Poppet valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5877117A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62197264A (en) * | 1986-02-20 | 1987-08-31 | Toshiba Mach Co Ltd | Production of wear resistant layer |
| DE3941028A1 (en) * | 1989-02-22 | 1990-08-23 | Riken Kk | USE FOR A DIESEL ENGINE WITH INDIRECT INJECTION |
| EP0723069A1 (en) * | 1995-01-23 | 1996-07-24 | Yamaha Hatsudoki Kabushiki Kaisha | A valve seat for a cylinder head and a method for producing the valve seat within a cylinder head |
| US5768779A (en) * | 1995-09-14 | 1998-06-23 | Yamaha Hatsudoki Kabushiki Kaisha | Method of manufacturing cylinder head for engine |
| US5778531A (en) * | 1995-09-14 | 1998-07-14 | Yamaha Hatsudoki Kabushiki Kaisha | Method of manufacturing cylinder head for engine |
-
1981
- 1981-11-04 JP JP17558581A patent/JPS5877117A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62197264A (en) * | 1986-02-20 | 1987-08-31 | Toshiba Mach Co Ltd | Production of wear resistant layer |
| DE3941028A1 (en) * | 1989-02-22 | 1990-08-23 | Riken Kk | USE FOR A DIESEL ENGINE WITH INDIRECT INJECTION |
| EP0723069A1 (en) * | 1995-01-23 | 1996-07-24 | Yamaha Hatsudoki Kabushiki Kaisha | A valve seat for a cylinder head and a method for producing the valve seat within a cylinder head |
| US5768779A (en) * | 1995-09-14 | 1998-06-23 | Yamaha Hatsudoki Kabushiki Kaisha | Method of manufacturing cylinder head for engine |
| US5778531A (en) * | 1995-09-14 | 1998-07-14 | Yamaha Hatsudoki Kabushiki Kaisha | Method of manufacturing cylinder head for engine |
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