JPH10280099A - Valve seat for internal combustion engine - Google Patents
Valve seat for internal combustion engineInfo
- Publication number
- JPH10280099A JPH10280099A JP9402297A JP9402297A JPH10280099A JP H10280099 A JPH10280099 A JP H10280099A JP 9402297 A JP9402297 A JP 9402297A JP 9402297 A JP9402297 A JP 9402297A JP H10280099 A JPH10280099 A JP H10280099A
- Authority
- JP
- Japan
- Prior art keywords
- valve seat
- alloy material
- internal combustion
- combustion engine
- base alloy
- 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
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関に用いら
れるバルブシートに係り、特に、被削性を向上させたバ
ルブシートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve seat used for an internal combustion engine, and more particularly to a valve seat having improved machinability.
【０００２】[0002]
【従来の技術】内燃機関用バルブシートは、生産性や寸
法精度が高く、かつ材料の歩留まりも良いなどの理由か
ら、近時、粉末冶金法により形成されることが多くなっ
てきている。2. Description of the Related Art In recent years, valve seats for internal combustion engines are often formed by powder metallurgy because of their high productivity, high dimensional accuracy, and good material yield.
【０００３】バルブシートにおけるエンジンバルブが着
座するシート部には、高い強度と耐摩耗性が要求され、
この要求を満たすために、従来のバルブシートは、焼結
材料に高合金材を用いたり、炭、窒化物等の硬質粒子を
添加するなどして、マトリックスの強化を図っている。A high strength and abrasion resistance are required for a seat portion of a valve seat on which an engine valve is seated.
In order to satisfy this requirement, the conventional valve seat uses a high alloy material as a sintering material or adds hard particles such as charcoal and nitride to strengthen the matrix.
【０００４】[0004]
【発明が解決しようとする課題】上述のように、焼結材
料に高合金材を用いたり、硬質粒子を添加したりする
と、製造後のバルブシート全体が硬質となり過ぎて、機
械加工性が悪化するだけでなく、高合金材は高価である
ため、コスト高となる。As described above, when a high alloy material is used as a sintering material or when hard particles are added, the valve seat as a whole becomes too hard after manufacture, resulting in poor machinability. In addition, the high alloy material is expensive, which increases the cost.
【０００５】本発明は、上記問題点に鑑みてなされたも
ので、高価かつ硬質の高合金材を用いたり、硬質粒子を
添加したりすることなく、耐摩耗性及び機械加工性に優
れるバルブシートを提供することを目的としている。[0005] The present invention has been made in view of the above problems, and is a valve seat having excellent wear resistance and machinability without using an expensive and hard high alloy material or adding hard particles. It is intended to provide.
【０００６】[0006]
【課題を解決するための手段】本発明によると、上記課
題は、次のようにして解決される。 (１) バルブシートを、高ＭnＦe基合金材料により形成
する。According to the present invention, the above-mentioned problem is solved as follows. (1) The valve seat is formed of a high MnFe-based alloy material.
【０００７】(２) 上記(１)項において、高ＭnＦe基合
金材料の組成を、重量比で、Ｃ：0.9〜1.2％、Ｍn：10
〜15％、Ｓi：0.3〜0.8％、残部がＦeと不可避的不純物
よりなるものとする。(2) In the above item (1), the composition of the high MnFe-based alloy material is C: 0.9-1.2%, Mn: 10
-15%, Si: 0.3-0.8%, the balance being Fe and unavoidable impurities.
【０００８】[0008]
【発明の実施の形態】図１は、本発明の一実施例を示
す。バルブシート(１)は、重量比において、Ｃ：0.9〜
1.2％、Ｍn：10〜15％、Ｓi：0.3〜0.8％、残部がＦeと
不可避的不純物よりなる組成の焼結合金により形成され
ている。FIG. 1 shows an embodiment of the present invention. The valve seat (1) has a weight ratio of C: 0.9 to
It is formed of a sintered alloy having a composition of 1.2%, Mn: 10 to 15%, Si: 0.3 to 0.8%, and the balance being Fe and unavoidable impurities.
【０００９】上記各元素の限定理由は、次のとおりであ
る。Ｃは、Ｆeマトリックスに固溶してこれを強化し、
合金の強度と耐摩耗性を向上させる元素であるが、0.9
％未満では、フェライトが多くなって、バルブシート
(１)に要求される強度及び耐摩耗性を確保するのが難し
く、また1.2％を超えると、セメンタイトを析出して脆
くなるとともに、硬くなり過ぎて機械加工性を悪化させ
る。The reasons for limiting the above elements are as follows. C strengthens this by solid solution in the Fe matrix,
It is an element that improves the strength and wear resistance of the alloy.
%, Ferrite increases and the valve seat
It is difficult to secure the strength and abrasion resistance required for (1), and if it exceeds 1.2%, cementite precipitates and becomes brittle, and becomes too hard to deteriorate machinability.
【００１０】Ｍnは、クリープ強度、被削性及び鍛造性
を向上させるとともに、合金の加工硬化性を促進させう
る元素であるが、10％未満では、十分なクリープ強度、
被削性及び鍛造性が得られず、また15％を超えると、被
削性及び鍛造性が良好となる反面、脆化が始まり、かつ
加工硬化性も低下する。Mn is an element which can improve the creep strength, machinability and forgeability and promote the work hardenability of the alloy.
If the machinability and forgeability are not obtained, and if it exceeds 15%, the machinability and forgeability will be good, but embrittlement will start, and the work hardenability will also decrease.
【００１１】Ｓiは、安定的な酸化被膜を形成して、耐
酸化性(高温強度)を高める元素であるが、0.3％未満で
は、耐酸化性は小さく、また0.8％を超えると、脆化が
始まり、高温強度を低下させる。Si is an element which forms a stable oxide film and enhances oxidation resistance (high-temperature strength). If it is less than 0.3%, the oxidation resistance is small, and if it exceeds 0.8%, it becomes brittle. Begins to reduce high-temperature strength.
【００１２】上記組成の原料粉を、通常の粉末冶金法、
すなわち混粉工程、圧粉体成形工程等を経て焼結したの
ち、熱間鍛造を施し、さらに必要により、熱処理、仕上
加工、溶浸又は含浸処理を施すことにより、上記バルブ
シート(１)が得られる。The raw material powder having the above composition is prepared by a usual powder metallurgy method,
That is, after sintering through a powder mixing step, a green compact forming step, etc., the valve seat (1) is subjected to hot forging and, if necessary, heat treatment, finishing, infiltration or impregnation processing. can get.
【００１３】このバルブシート(１)をエンジンに装着す
ると、Ｍnの含有量を大としてあるため、シート部(1a)
にエンジンバルブ(２)が着座する際の衝撃荷重により、
シート部(1a)が加工硬化を起こし、運転中に次第に硬化
するようになる。その結果、バルブシート(１)の耐摩耗
性は大幅に向上する。When this valve seat (1) is mounted on an engine, the content of Mn is increased, so that the seat portion (1a)
The impact load when the engine valve (2) is seated on the
The seat portion (1a) undergoes work hardening, and gradually hardens during operation. As a result, the wear resistance of the valve seat (1) is greatly improved.
【００１４】本願発明者らは、使用前におけるシート部
(1a)のビッカース硬さが、Ｈv２００程度であるのに対
して、台上耐久試験による3,000km連続高速走行に相当
する運転後においては、そのビッカース硬さが、約Ｈv
４００まで高まることを確認している。[0014] The inventors of the present invention have proposed a sheet portion before use.
While the Vickers hardness of (1a) is about Hv200, the Vickers hardness after driving equivalent to 3,000 km continuous high-speed running in a bench durability test is about Hv.
It has been confirmed to increase to 400.
【００１５】本発明は、上記組成の焼結合金の外、それ
と同じ合金鋼により形成する際にも適用しうる。The present invention can be applied not only to a sintered alloy having the above composition but also to a case of forming the same alloy steel.
【００１６】[0016]
【発明の効果】本発明によれば、従来のような高合金材
や硬質粒子を用いることなく、運転中の加工硬化により
強度及び耐摩耗性を向上させることができるので、機械
加工性は良好となり、かつ製造コストの低減が図れる。According to the present invention, strength and wear resistance can be improved by work hardening during operation without using a high alloy material or hard particles as in the prior art, so that machinability is good. And the manufacturing cost can be reduced.
【図１】本発明の一実施例を示す中央縦断正面図であ
る。FIG. 1 is a central longitudinal sectional front view showing an embodiment of the present invention.
(１)バルブシート (1a)シート部 (２)エンジンバルブ (1) Valve seat (1a) Seat (2) Engine valve
Claims (2)
を特徴とする内燃機関用バルブシート。1. A valve seat for an internal combustion engine, which is formed of a high MnFe-based alloy material.
で、Ｃ：0.9〜1.2％、Ｍn：10〜15％、Ｓi：0.3〜0.8
％、残部がＦeと不可避的不純物よりなるものとした請
求項１記載の内燃機関用バルブシート。2. The composition of the high MnFe-based alloy material is, by weight, C: 0.9-1.2%, Mn: 10-15%, Si: 0.3-0.8.
The valve seat for an internal combustion engine according to claim 1, wherein the balance is made up of Fe and inevitable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9402297A JPH10280099A (en) | 1997-04-11 | 1997-04-11 | Valve seat for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9402297A JPH10280099A (en) | 1997-04-11 | 1997-04-11 | Valve seat for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10280099A true JPH10280099A (en) | 1998-10-20 |
Family
ID=14098942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9402297A Pending JPH10280099A (en) | 1997-04-11 | 1997-04-11 | Valve seat for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10280099A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2162651A2 (en) * | 2007-06-13 | 2010-03-17 | Gkn Sinter Metals, Llc | Powder metal component tolerance improvements |
| CN103357863A (en) * | 2013-06-21 | 2013-10-23 | 马鞍山市恒毅机械制造有限公司 | High abrasion resistant metallurgy valve seat and preparation method thereof |
-
1997
- 1997-04-11 JP JP9402297A patent/JPH10280099A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2162651A2 (en) * | 2007-06-13 | 2010-03-17 | Gkn Sinter Metals, Llc | Powder metal component tolerance improvements |
| EP2162651A4 (en) * | 2007-06-13 | 2011-09-07 | Gkn Sinter Metals Llc | Powder metal component tolerance improvements |
| US8636264B2 (en) | 2007-06-13 | 2014-01-28 | Gkn Sinter Metals, Llc | Powder metal component tolerance improvements |
| CN103357863A (en) * | 2013-06-21 | 2013-10-23 | 马鞍山市恒毅机械制造有限公司 | High abrasion resistant metallurgy valve seat and preparation method thereof |
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