JP3346270B2 - Piston ring wear ring made of free graphite precipitated iron-based sintered material with excellent high temperature wear resistance - Google Patents
Piston ring wear ring made of free graphite precipitated iron-based sintered material with excellent high temperature wear resistanceInfo
- Publication number
- JP3346270B2 JP3346270B2 JP08484098A JP8484098A JP3346270B2 JP 3346270 B2 JP3346270 B2 JP 3346270B2 JP 08484098 A JP08484098 A JP 08484098A JP 8484098 A JP8484098 A JP 8484098A JP 3346270 B2 JP3346270 B2 JP 3346270B2
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- JP
- Japan
- Prior art keywords
- free graphite
- sintered material
- wear
- ring
- wear resistance
- 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.)
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Description
【０００１】[0001]
【発明の属する技術分野】この発明は、すぐれた高温耐
摩耗性を有し、かつ相手攻撃性（ピストンリング攻撃
性）の小さい遊離黒鉛析出鉄系焼結材料製ピストンリン
グ耐摩環に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston ring wear ring made of a free graphite-precipitated iron-based sintered material having excellent high-temperature wear resistance and low aggressiveness (piston ring aggressiveness). .
【０００２】[0002]
【従来の技術】従来、例えば特公昭５７−３２７４３号
公報に記載されるように、例えばトラック・バス用ディ
ーゼルエンジンのピストンが、図１（ａ）の概略縦断面
図および同（ｂ）の要部縦断面図で示される構造を有
し、かつ図示される通りトップランド部直下のトップリ
ング溝にはピストンリング耐摩環がピストン鋳物本体の
鋳造時に鋳ぐるまれて設けられた構造をもつことは良く
知られるところである。また、ピストン鋳物本体が、主
としてＳｉ：８〜１３重量％を含有したＡｌ−Ｓｉ系合
金で構成され、さらに上記ピストンリング耐摩環には、
良好な耐摩耗性と相手攻撃性の低いＦｅ−Ｎｉ−Ｃｕ系
焼結材料（組成：Ｆｅ−８〜２５％Ｎｉ−３．５〜１０
％Ｃｕ−２．０％以下Ｃ）や、Ｎｉ−Ｃｕ−Ｃｒ系オー
ステナイト鋳鉄であるニレジスト鋳鉄（組成：Ｆｅ−
１．５〜３．５％Ｃｒ−０．８〜１．５％Ｍｎ−３％以
下Ｃ−１３〜２２％Ｎｉ−８％以下Ｃｕ−１．０〜２．
８％Ｓｉ、以上重量％、以下％は重量％を示す）などが
広く用いられていることも良く知られるところである。2. Description of the Related Art Conventionally, as described in, for example, Japanese Patent Publication No. 57-32743, a piston of a diesel engine for trucks and buses, for example, has a schematic longitudinal sectional view of FIG. Having a structure shown in the vertical sectional view of the part, and having a structure in which a piston ring wear ring is provided in the top ring groove immediately below the top land part as shown in the figure when the piston casting body is cast. It is well known. Further, the piston casting main body is mainly composed of an Al—Si alloy containing 8 to 13% by weight of Si.
Fe-Ni-Cu based sintered material with good wear resistance and low aggressiveness to the partner (composition: Fe-8 to 25% Ni-3.5 to 10)
% Cu-2.0% or less C) or a Ni-resist cast iron (composition: Fe-
1.5-3.5% Cr-0.8-1.5% Mn-3% or less C-13-22% Ni-8% or less Cu-1.0-2.
It is also well known that 8% Si, more than% by weight, and less than% represents% by weight) are widely used.
【０００３】[0003]
【発明が解決しようとする課題】一方、自動車に対する
排気ガス規制は年々厳しさを増す傾向にあり、この対応
手段の１つとして、トラック・バス用ディーゼルエンジ
ンでは、ピストンのトップランド部直下のトップリング
溝の位置を上方へ移動させてトップランド部外周面、ト
ップリング上面、およびシリンダー内周面で形成される
空隙の容量を小さくし、もって未燃焼のまま大気に排出
されてしまう前記空隙部分のガス量を少なくする試みも
なされているが、このようにトップリング溝の位置を上
方へ移動すると、トップリング溝の温度が急激に高くな
り、この結果ピストンリング耐摩環が上記のＦｅ−Ｎｉ
−Ｃｕ系焼結材料やニレジスト鋳鉄で構成されていて
も、これの摩耗進行の急速な進行は避けられず、この摩
耗現象は近年のエンジンの高出力化および大型化に伴っ
て一段と加速され、この摩耗部分からガス漏れが発生す
るようになるのが現状である。On the other hand, exhaust gas regulations for automobiles tend to be stricter year by year. One of the measures to cope with this problem is to use a diesel engine for trucks and buses with a top just below the top land of the piston. The position of the ring groove is moved upward to reduce the volume of the void formed by the outer peripheral surface of the top land portion, the top ring upper surface, and the inner peripheral surface of the cylinder, so that the void portion is discharged to the atmosphere without burning. Attempts have been made to reduce the gas amount of the top ring groove, but when the position of the top ring groove is moved upward in this way, the temperature of the top ring groove sharply increases, and as a result, the piston ring wear ring has the above-mentioned Fe-Ni
-Even if it is composed of Cu-based sintered material or Niresist cast iron, the rapid progress of wear is unavoidable, and this wear phenomenon is further accelerated with the recent increase in engine output and size, At present, gas leakage occurs from the worn portion.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者等は、
上述のような観点から、ピストンにおけるトップリング
溝の上方位置移動を可能にするピストンリング耐摩環を
開発すべく研究を行った結果、原料粉末として、基本的
にＦｅに、合金成分としてＳ（硫黄）成分、あるいはＮ
ｉおよびＳ成分、さらにＣｒ、Ｍｎ、およびＳ成分、必
要に応じてＭｏ成分をそれぞれ所定量含有させてなるア
トマイズＦｅ合金粉末と、六方晶窒化ほう素（以下、ｈ
−ＢＮで示す）粉末および／またはほう酸粉末を用い、
さらに水素化チタン（以下、ＴｉＨx で示す）粉末、Ｎ
ｉ粉末、Ｍｏ粉末、Ｍｎ粉末、Ｃｕ粉末、Ｓ（硫黄）粉
末、および黒鉛粉末を用い、これら原料粉末を所定の配
合組成に配合し、通常の条件で混合し、圧粉体にプレス
成形した状態で、前記圧粉体を、還元性雰囲気中、相対
的に高い焼結温度となる１１００〜１２５０℃の範囲内
の所定温度に加熱し、所定時間保持後、相対的に遅い冷
却速度、望ましくは４０℃／分以下の冷却速度で、少な
くとも６００℃まで冷却の条件で焼結して、 Ｃｒ：０．５〜５％、 Ｍｎ：０．２〜１％、 Ｓ ：０．０５〜１％、 Ｂ ：０．０５〜１％、 Ｃ ：０．５〜５％、 Ｎｉ：１〜１２％、 Ｔｉ：０．５〜５％、 Ｃｕ：１〜８％、 を含有し、さらに必要に応じて、 Ｍｏ：０．１〜２％、 を含有し、残りがＦｅと不可避不純物からなる組成を有
し、かつ望ましくは６．０〜７．２ｇ／ｃｍ3 の密度、
さらに言い換えれば８０〜９５％の理論密度比をもった
鉄系焼結材料を形成すると、この鉄系焼結材料において
は、前記焼結温度で、素地を形成する上記Ｆｅ合金粉末
にＣ成分（黒鉛粉末）が固溶し、この固溶したＣ成分が
上記ｈ−ＢＮ粉末およびほう酸粉末のＢ成分と前記Ｆｅ
合金粉末中に固溶のＳ成分の共働作用で、冷却過程で気
孔内に遊離黒鉛として析出し、成長して、すぐれた耐焼
付性と高温潤滑性を示すようになり、したがって前記鉄
系焼結材料からなるピストンリング耐摩環は、前記気孔
内に析出して成長した遊離黒鉛と、Ｎｉ、Ｃｒ，Ｍｎ、
およびＴｉ成分、さらに必要に応じてＭｏ成分が固溶し
て形成された耐熱性のすぐれたオーステナイト相の素
地、あるいはオーステナイト相で僅かなパーライト相が
存在した素地とによって、低い相手攻撃性で、かつすぐ
れた高温耐摩耗性を発揮し、この結果ピストンにおける
トップリング溝の上方位置移動が可能になるという研究
結果を得たのである。Means for Solving the Problems Accordingly, the present inventors have
From the above-mentioned viewpoints, as a result of research to develop a piston ring wear ring that enables the piston to move upward in the top ring groove, as a result, the raw material powder is basically Fe and the alloy component is S (sulfur). ) Component, or N
an atomized Fe alloy powder containing predetermined amounts of i and S components, Cr, Mn, and S components, and if necessary, Mo components, and hexagonal boron nitride (hereinafter, h
-Indicated by BN) and / or boric acid powder;
Further titanium hydride (hereinafter, indicated by TiH x) powders, N
Using i-powder, Mo-powder, Mn-powder, Cu-powder, S (sulfur) -powder, and graphite powder, these raw-material powders were blended into a predetermined composition, mixed under ordinary conditions, and pressed into a green compact. In this state, the green compact is heated in a reducing atmosphere to a predetermined temperature within a range of 1100 to 1250 ° C. at which a relatively high sintering temperature is obtained, and after holding for a predetermined time, a relatively slow cooling rate, desirably. Is sintered at a cooling rate of 40 ° C./min or less at a cooling rate of at least 600 ° C., Cr: 0.5 to 5%, Mn: 0.2 to 1%, S: 0.05 to 1% , B: 0.05 to 1%, C: 0.5 to 5%, Ni: 1 to 12%, Ti: 0.5 to 5%, Cu: 1 to 8%, and if necessary Mo: 0.1% to 2%, the balance being composed of Fe and inevitable impurities. Density of 6.0~7.2g / cm 3,
In other words, when an iron-based sintered material having a theoretical density ratio of 80 to 95% is formed, in this iron-based sintered material, the C component ( Graphite powder) is dissolved, and the dissolved C component is combined with the B component of the h-BN powder and boric acid powder and the Fe component.
By the synergistic action of the S component dissolved in the alloy powder, during the cooling process, it precipitates as free graphite in the pores, grows, and exhibits excellent seizure resistance and high-temperature lubrication. The piston ring wear ring made of a sintered material is composed of free graphite deposited and grown in the pores, Ni, Cr, Mn,
And a Ti component, and optionally a Mo component as a solid solution, formed of a heat-resistant excellent austenite phase base or a base in which a slight pearlite phase was present in the austenite phase, resulting in low opponent aggression. In addition, they have demonstrated that they exhibit excellent high-temperature wear resistance, and as a result, the piston can be moved upward in the top ring groove.
【０００５】この発明は、上記の研究結果に基づいてな
されたものであって、 Ｃｒ：０．５〜５％、 Ｍｎ：０．２〜１％、 Ｓ ：０．０５〜１％、 Ｂ ：０．０５〜１％、 Ｃ ：０．５〜５％、 Ｎｉ：１〜１２％、 Ｔｉ：０．５〜５％、 Ｃｕ：１〜８％、 を含有し、さらに必要に応じて、 Ｍｏ：０．１〜２％、 を含有し、残りがＦｅと不可避不純物からなる組成、並
びにオーステナイト相の素地、あるいはオーステナイト
相で僅かなパーライト相が存在した素地からなり、かつ
気孔内には析出成長した遊離黒鉛が存在する組織を有す
る遊離黒鉛析出鉄系焼結材料で構成してなる、相手攻撃
性が小さく、かつ高温耐摩耗性のすぐれた遊離黒鉛析出
鉄系焼結材料製ピストンリング耐摩環に特徴を有するも
のである。The present invention has been made on the basis of the above-mentioned research results, wherein Cr: 0.5 to 5%, Mn: 0.2 to 1%, S: 0.05 to 1%, B: 0.05 to 1%, C: 0.5 to 5%, Ni: 1 to 12%, Ti: 0.5 to 5%, and Cu: 1 to 8%. : 0.1 to 2%, the balance being Fe and unavoidable impurities, and an austenite phase base, or a base in which a slight pearlite phase was present in the austenite phase, and precipitate growth in the pores Piston ring wear ring made of free graphite-precipitated iron-based sintered material composed of free graphite-precipitated iron-based sintered material having a structure in which free graphite is present, and having low aggressiveness and excellent high-temperature wear resistance It is characterized by the following.
【０００６】つぎに、この発明のピストンリング耐摩環
において、これを構成する遊離黒鉛析出鉄系焼結材料の
成分組成を上記の通りに限定した理由を説明する。 （ａ）Ｃｒ Ｃｒ成分は、オーステナイト相の素地、あるいはオース
テナイト相で僅かなパーライト相が存在した素地に固溶
して、これの耐熱性を向上させ、もってピストンリング
耐摩環の高温耐摩耗性向上に寄与する作用をもつが、そ
の含有量が０．５％未満では前記作用に所望の向上効果
が得られず、一方その含有量が５％を越えると、Ｂ成分
およびＳ成分による黒鉛の析出および成長作用が抑制さ
れるようになることから、その含有量を０．５〜５％、
望ましくは１〜３％と定めた。Next, the reason why the component composition of the free graphite-precipitated iron-based sintered material constituting the piston ring wear ring of the present invention is limited as described above will be described. (A) Cr The Cr component forms a solid solution in an austenite phase base or a base in which a slight pearlite phase exists in the austenite phase, thereby improving the heat resistance of the base, thereby improving the high-temperature wear resistance of the piston ring wear ring. However, if the content is less than 0.5%, a desired improvement effect cannot be obtained in the above-mentioned effect, while if the content exceeds 5%, the precipitation of graphite by the B component and the S component will be prevented. And since the growth action is suppressed, the content is 0.5 to 5%,
Desirably, it was set to 1 to 3%.
【０００７】（ｂ）Ｍｎ Ｍｎ成分は、素地に固溶して強度を向上させる作用をも
つが、その含有量が０．２％未満では所望の強度向上効
果が得られず、一方その含有量が１％を越えると、Ｂ成
分およびＳ成分による黒鉛化が著しく阻害されるように
なることから、その含有量を０．２〜１％、望ましくは
０．４〜０．８％と定めた。(B) Mn The Mn component has a function of improving strength by forming a solid solution in a base material. However, if its content is less than 0.2%, a desired effect of improving strength cannot be obtained. Exceeds 1%, the graphitization by the B component and the S component is significantly inhibited. Therefore, the content is set to 0.2 to 1%, preferably 0.4 to 0.8%. .
【０００８】（ｃ）ＳおよびＢ これらの成分は、共働作用により固溶した黒鉛を冷却過
程で微細な遊離黒鉛として主に気孔内に積極的に析出さ
せ、成長させる作用をもち、このような黒鉛化作用は、
Ｓ成分については、原則的として予めＦｅ、Ｆｅ−Ｎｉ
合金やＦｅ−Ｎｉ−Ｍｏ合金、さらにＦｅ−Ｃｒ−Ｍｎ
合金やＦｅ−Ｃｒ−Ｍｎ−Ｍｏ合金にそれぞれ所定量の
Ｓ成分を含有させた溶湯をアトマイズして形成したＦｅ
合金粉末、また、Ｂ成分については、ほう素源としてｈ
−ＢＮ粉末およびほう酸粉末をそれぞれ原料粉末として
用いることにより一段と促進されるものであるが、その
含有量が、ＳおよびＢ成分のいずれかでも０．０５％未
満になると、所望の黒鉛化を図ることができず、この結
果耐焼付性および高温潤滑性の向上、すなわち高温耐摩
耗性の向上が不十分となるばかりでなく、硬質のセメン
タイト（Ｆｅ3 Ｃ）が析出するようになって、相手攻撃
性（ピストンリング攻撃性）が増大するようになり、一
方その含有量が、ＳおよびＢ成分のいずれかでも１％を
越えると、焼結性が低下し、所望の強度を確保すること
ができなくなるばかりでなく、素地にフェライト相が出
現するようになり、この結果オーステナイト相が減少す
るようになって所望の高温耐摩耗性を確保することがで
きなくなることから、その含有量を、それぞれＳ：０．
０５〜１％、望ましくは０．１〜０．５％、Ｂ：０．０
５〜１％、望ましくは０．１〜０．５％と定めた。(C) S and B These components have the function of positively precipitating and growing graphite dissolved in solid solution as fine free graphite mainly in pores during the cooling process by synergistic action. The graphitizing effect is
As for the S component, in principle, Fe, Fe-Ni
Alloys and Fe-Ni-Mo alloys, as well as Fe-Cr-Mn
Alloys and Fe-Cr-Mn-Mo alloys are formed by atomizing a molten metal containing a predetermined amount of an S component.
For the alloy powder and the B component, h is used as a boron source.
-It is further promoted by using BN powder and boric acid powder as raw material powders respectively. If the content of any of S and B components is less than 0.05%, desired graphitization is achieved. As a result, not only the improvement in seizure resistance and high-temperature lubricity, that is, the improvement in high-temperature wear resistance is insufficient, but also hard cementite (Fe 3 C) precipitates, When the aggressiveness (piston ring aggressiveness) increases, on the other hand, if the content of any of the S and B components exceeds 1%, the sinterability decreases, and the desired strength can be secured. Not only can it not be possible, but also the ferrite phase appears on the base material, and as a result, the austenite phase decreases so that the desired high-temperature wear resistance cannot be secured. , The content thereof, respectively S: 0.
05-1%, desirably 0.1-0.5%, B: 0.0
5-1%, preferably 0.1-0.5%.
【０００９】（ｄ）Ｃ Ｃ成分は、素地に固溶して強度を向上させるほか、上記
の通り遊離黒鉛として気孔中に析出して耐焼付性および
高温潤滑性を向上させ、もって高温耐摩耗性の向上に寄
与すると共に、相手攻撃性を緩和する作用をもつが、そ
の含有量が０．５％未満では前記作用に所望の向上効果
が得られず、一方その含有量が５％を越えると、強度に
急激な低下傾向が現れるようになることから、その含有
量を０．５〜５％、望ましくは１〜３％と定めた。(D) CC In addition to improving the strength by dissolving in the base material, the C component precipitates in the pores as free graphite as described above to improve seizure resistance and high-temperature lubricating properties, and thus has high-temperature wear resistance. While it has the effect of contributing to the improvement of the aggressiveness and the effect of alleviating the aggressiveness of the opponent, if the content is less than 0.5%, the desired effect of improving the effect cannot be obtained, while the content exceeds 5%. And the strength tends to sharply decrease, the content is determined to be 0.5 to 5%, preferably 1 to 3%.
【００１０】（ｅ）ＮｉおよびＴｉ これらの成分は、共に素地に固溶してオーステナイト相
の形成を促進し、かつ上記の通りＣｒ成分との共存固溶
によってオーステナイト相の耐熱性を向上させ、もって
高温耐摩耗性の向上に寄与する作用をもつが、その含有
量が、それぞれＮｉ：１％未満、Ｔｉ：０．５％未満で
は前記作用に所望の向上効果が得られず、一方その含有
量が、Ｎｉにあってはオーステナイト相の形成には１２
％で十分であり、またＴｉにあっては５％を越えると強
度が低下するようになることから、その含有量を、それ
ぞれＮｉ：１〜１２％、望ましくは３〜８％、Ｔｉ：
０．５〜５％、望ましくは１〜３％と定めた。なお、Ｔ
ｉ成分に関しては、原料粉末としてＴｉＨx 粉末を用
い、焼結の活性化を図ると共に、焼結に際して分解水素
による強力な還元作用を発揮させるようにするのが望ま
しい。(E) Ni and Ti These components form a solid solution in the matrix to promote the formation of the austenite phase, and improve the heat resistance of the austenite phase by co-dissolution with the Cr component as described above. Therefore, it has the effect of contributing to the improvement of high-temperature wear resistance. However, if its content is less than 1% of Ni and less than 0.5% of Ti, a desired improvement effect cannot be obtained in the above-mentioned effect. If the amount is Ni, the formation of austenite phase is 12%.
% Is sufficient, and in the case of Ti, if it exceeds 5%, the strength decreases. Therefore, the content is set to Ni: 1 to 12%, preferably 3 to 8%, and Ti:
0.5-5%, preferably 1-3%. Note that T
Regarding the i component, it is desirable to use TiH x powder as a raw material powder to activate sintering and to exert a strong reducing action by decomposed hydrogen during sintering.
【００１１】（ｆ）Ｃｕ Ｃｕ成分は、所定の強度を確保するのに不可欠な液相焼
結のために必要な成分であるが、その含有量が１％未満
では十分な焼結性が得られず、したがって所望の強度を
確保することができず、一方所望の良好な焼結性は８％
までの含有で十分であることから、その含有量を１〜８
％、望ましくは２〜４％と定めた。(F) Cu The Cu component is a component necessary for liquid phase sintering, which is indispensable for securing a predetermined strength. If its content is less than 1%, sufficient sinterability can be obtained. And therefore the desired strength cannot be ensured, while the desired good sinterability is 8%
Is sufficient, the content should be 1 to 8
%, Preferably 2 to 4%.
【００１２】（ｇ）Ｍｏ Ｍｏ成分は、素地に固溶して強度を向上させる作用をも
つので、必要に応じて含有されるが、その含有量が０．
１％未満では所望の強度向上効果が得られず、一方その
含有量が２％を越えると、原料粉末（混合粉末）のプレ
ス成形性（圧縮性）が低下し、この結果焼結材料の密度
が６．０ｇ／ｃｍ3 未満となってしまい、望ましい密度
である６．０〜７．２ｇ／ｃｍ3 の密度が得られず、所
望の強度を確保することができなくなることから、その
含有量を０．１〜２％、望ましくは０．５〜１．５％と
定めた。(G) Mo The Mo component has a function of improving the strength by forming a solid solution in the base material. Therefore, the Mo component is contained if necessary.
If the content is less than 1%, the desired strength-improving effect cannot be obtained, while if the content exceeds 2%, the press formability (compressibility) of the raw material powder (mixed powder) is reduced, and as a result, the density of the sintered material is reduced. There becomes less than 6.0 g / cm 3, can not be obtained density of 6.0~7.2g / cm 3 is desirable density, since it becomes impossible to ensure a desired strength, the content of Was determined to be 0.1 to 2%, preferably 0.5 to 1.5%.
【００１３】[0013]
【発明の実施の形態】この発明のピストンリング耐摩環
を実施例により具体的に説明する。原料粉末として、い
ずれも１０〜１５０μｍの範囲内の所定の平均粒径を有
するアトマイズＦｅ−Ｓ合金粉末（Ｓ：０．３２％含
有）、アトマイズＦｅ−Ｎｉ−Ｍｏ−Ｓ合金粉末（Ｎ
ｉ：４．２％、Ｍｏ：１．５％、Ｓ：０．１３％含
有）、アトマイズＦｅ−Ｃｒ−Ｍｎ−Ｓ合金粉末（Ｃ
ｒ：２．１％、Ｍｎ：０．７５％、Ｓ：０．２２％含
有）、ＴｉＨx 粉末、Ｎｉ粉末、Ｍｏ粉末、Ｍｎ粉末、
Ｃｕ粉末、Ｓ（硫黄）粉末、黒鉛粉末、ｈ−ＢＮ粉末、
およびほう酸粉末を用意し、これら原料粉末を所定の配
合組成に配合し、潤滑材としてステアリン酸亜鉛を０．
７％添加してＶ型ミキサーで３０分間混合し、６ｔｏｎ
／ｃｍ2 の圧力で圧粉体にプレス成形し、この圧粉体を
アンモニア分解ガス雰囲気中、温度：１１４０℃に１時
間保持した後、３５℃／分の冷却速度で５５０℃まで徐
冷後放冷の条件で焼結することにより表１、２に示され
る成分組成を有し、かつ外径：１２０ｍｍ×内径：１０
２ｍｍ×厚さ：７ｍｍの寸法をもった本発明ピストンリ
ング耐摩環（以下、本発明耐摩環と云う）１〜２９をそ
れぞれ製造した。上記本発明耐摩環１〜２９は、いずれ
も６．２〜７．１ｇ／ｃｍ3 の範囲内の密度を有し、素
地がオーステナイト相、あるいは主体がオーステナイト
相で僅かなパーライト相が存在する素地からなり、かつ
気孔内に遊離黒鉛が析出した光学顕微鏡組織観察結果を
示した。また、比較の目的で、通常の高周波溶解炉に
て、同じく表２に示される成分組成をもったニレジスト
鋳鉄の溶湯を調製し、これをシェルモールド鋳型に鋳造
して、同じ寸法をもった従来ピストンリング耐摩環（以
下、従来耐摩環と云う）を製造した。BEST MODE FOR CARRYING OUT THE INVENTION The piston ring wear ring of the present invention will be specifically described with reference to examples. As raw material powders, atomized Fe-S alloy powder (containing 0.32% of S) and atomized Fe-Ni-Mo-S alloy powder (N
i: 4.2%, Mo: 1.5%, S: 0.13%), atomized Fe-Cr-Mn-S alloy powder (C
r: 2.1%, Mn: 0.75%, S: 0.22%), TiH x powder, Ni powder, Mo powder, Mn powder,
Cu powder, S (sulfur) powder, graphite powder, h-BN powder,
And boric acid powder are prepared, and these raw material powders are blended in a predetermined blending composition.
Add 7% and mix with V-type mixer for 30 minutes, 6 tons
/ Cm 2 at a pressure of 1 / cm 2 , press-molding the green compact in an ammonia decomposition gas atmosphere at a temperature of 1140 ° C. for 1 hour, and then gradually cooling to 550 ° C. at a cooling rate of 35 ° C./min. By sintering under the condition of standing to cool, it has the component composition shown in Tables 1 and 2, and has an outer diameter of 120 mm and an inner diameter of 10
Piston ring wear rings of the present invention (hereinafter, referred to as the present invention wear rings) 1 to 29 each having a size of 2 mm × thickness: 7 mm were produced. Each of the above wear rings 1 to 29 of the present invention has a density in the range of 6.2 to 7.1 g / cm 3 , and has a base material of an austenite phase or a base material of an austenite phase and a slight pearlite phase. , And the results of optical microscopic observation of the structure in which free graphite was precipitated in the pores were shown. Further, for comparison purposes, a melt of niresist cast iron having the same component composition as shown in Table 2 was prepared in a normal high-frequency melting furnace, and this was cast into a shell mold, and a conventional mold having the same dimensions was prepared. A piston ring wear ring (hereinafter referred to as a conventional wear ring) was manufactured.
【００１４】ついで、上記の各種耐摩環を、通常の条件
で前処理、すなわち脱脂、乾燥、および温度：７００℃
の後述の鋳造Ａｌ−Ｓｉ系合金と同じ組成をもったＡｌ
−Ｓｉ系合金溶湯中に５分間浸漬の前処理を施した状態
で、それぞれピストン精密鋳造金型内に設置し、これに
Ａｌ−１２．１％Ｓｉ−１．０５％Ｃｕ−０．９６％Ｍ
ｇ−１．１２％Ｎｉの組成をもったＡｌ−Ｓｉ系合金溶
湯を鋳造してピストン本体を形成すると共に、前記耐摩
環を鋳包み、ついで前記耐摩環に切削加工にて外周面に
沿って溝深さ：７ｍｍ×溝幅：３ｍｍの寸法のトップリ
ング溝を形成することにより、トップランド部上面とト
ップリング溝上面間の距離を５ｍｍ（この種のピストン
で従来採用されている前記距離は通常１５ｍｍ）とした
トップリング溝上方位置移動のＡｌ−Ｓｉ系合金製ピス
トンをそれぞれ製造した。Next, the above-mentioned various wear rings are pre-treated under ordinary conditions, ie, degreasing, drying, and temperature: 700 ° C.
Having the same composition as the cast Al-Si alloy described below
-Pretreated by immersion in a molten Si-based alloy for 5 minutes, each was placed in a piston precision casting mold, and Al-12. 1% Si- 1.05% Cu- 0.96% M
The piston body is formed by casting a molten Al-Si alloy having a composition of g-1.12% Ni, and the wear ring is wrapped around. Then, the wear ring is cut along the outer circumferential surface. By forming a top ring groove having a dimension of groove depth: 7 mm × groove width: 3 mm, the distance between the top land portion upper surface and the top ring groove upper surface is 5 mm (the distance conventionally used in this type of piston is: A piston made of an Al-Si alloy and moved to a position above the top ring groove (usually 15 mm) was manufactured.
【００１５】さらに、これらのピストンを、排気量：８
２００ｃｃの直列６気筒直噴ディーゼルエンジンに組み
込み、回転数：３２００ｒｐｍ、エンジンの冷却温度：
８０℃、運転モード：５００時間連続運転、負荷：フル
出力の条件で加速運転試験を行ない、試験後の耐摩環の
トップリング溝の溝幅を外周面にそって測定し、この測
定結果より算出した最大摩耗量（試験後の最大溝幅−試
験前の溝幅）をもって高温耐摩耗性を評価し、また上記
トップリング溝に嵌合されたピストンリング（Ｆｅ−
２．７％Ｓｉ−３．５％Ｃの組成をもったＣｒメッキの
球状黒鉛鋳鉄製）の上下面における最大摩耗深さを測定
することにより相手攻撃性を評価した。これらの測定結
果を表３に示した。Further, these pistons are provided with a displacement of 8
Installed in a 200cc direct-injection 6-cylinder direct-injection diesel engine, rotation speed: 3200 rpm, engine cooling temperature:
An accelerated operation test was performed under the conditions of 80 ° C., operation mode: continuous operation for 500 hours, and load: full output, and the groove width of the top ring groove of the ring after the test was measured along the outer peripheral surface.
Maximum wear calculated from the results (maximum groove width after test-test
The high-temperature wear resistance was evaluated based on the groove width before the test, and the piston ring (Fe-
The opposing aggressiveness was evaluated by measuring the maximum wear depth on the upper and lower surfaces of a Cr-plated spheroidal graphite cast iron having a composition of 2.7% Si-3.5% C). Table 3 shows the results of these measurements.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【表２】 [Table 2]
【００１８】[0018]
【表３】 [Table 3]
【００１９】[0019]
【発明の効果】表３に示される結果から、本発明耐摩環
１〜２９は、いずれもトップリング溝の上方位置移動に
もかかわらず、すぐれた高温耐摩耗性を示し、かつ相手
攻撃性もきわめて小さいのに対して、ニレジスト鋳鉄か
らなる従来耐摩環は十分な高温耐摩耗性を具備するもの
でないために、トップリング溝の上方位置移動によって
摩耗進行が著しく加速されるようになることが明らかで
ある。上述のように、この発明のピストンリング耐摩環
は、トップリング溝の位置を上方へ移動した状態でＡｌ
−Ｓｉ系合金製ピストンに適用しても小さい相手攻撃性
で、すぐれた高温耐摩耗性を発揮することから、エンジ
ンの排気ガス規制に十分満足に対応することができるも
のである。From the results shown in Table 3, all of the wear rings 1 to 29 of the present invention show excellent high-temperature wear resistance despite the upward movement of the top ring groove, and also have an aggressiveness against the opponent. In contrast to the extremely small size, the conventional wear ring made of Niresist cast iron does not have sufficient high-temperature wear resistance. It is. As described above, the piston ring anti-wear ring of the present invention has an aluminum ring with the position of the top ring groove moved upward.
-Even when applied to a piston made of a Si-based alloy, it exhibits a low aggressiveness to a partner and exhibits excellent high-temperature wear resistance, so that it can sufficiently satisfy exhaust gas regulations of an engine.
【図１】ディーゼルエンジンのピストンを例示する概略
縦断面図（ａ）および同要部縦断面図（ｂ）である。FIG. 1A is a schematic longitudinal sectional view illustrating a piston of a diesel engine, and FIG.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 38/00 304 C22C 38/54 F02F 3/00 F02F 3/00 302 C22C 33/02 103 ──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. 7 , DB name) C22C 38/00 304 C22C 38/54 F02F 3/00 F02F 3/00 302 C22C 33/02 103
Claims (2)
びにオーステナイト相の素地、あるいはオーステナイト
相で僅かなパーライト相が存在した素地からなり、かつ
気孔内には析出成長した遊離黒鉛が存在する組織を有す
る遊離黒鉛析出鉄系焼結材料で構成したことを特徴とす
る高温耐摩耗性のすぐれた遊離黒鉛析出鉄系焼結材料製
ピストンリング耐摩環。1. Weight%: Cr: 0.5 to 5%, Mn: 0.2 to 1%, S: 0.05 to 1%, B: 0.05 to 1%, C: 0.5 -5%, Ni: 1-12%, Ti: 0.5-5%, Cu: 1-8%, the balance being Fe and unavoidable impurities, and the austenite base or austenite phase Excellent high-temperature wear resistance characterized by being composed of a free graphite-precipitated iron-based sintered material that has a structure in which a small amount of pearlite phase is present and has a structure in which free graphite precipitated and grown is present in pores. Piston ring made of free graphite precipitated iron-based sintered material.
びにオーステナイト相の素地、あるいはオーステナイト
相で僅かなパーライト相が存在した素地からなり、かつ
気孔内には析出成長した遊離黒鉛が存在する組織を有す
る遊離黒鉛析出鉄系焼結材料で構成したことを特徴とす
る高温耐摩耗性のすぐれた遊離黒鉛析出鉄系焼結材料製
ピストンリング耐摩環。2. In% by weight, Cr: 0.5 to 5%, Mn: 0.2 to 1%, S: 0.05 to 1%, B: 0.05 to 1%, C: 0.5 5%, Ni: 1 to 12%, Ti: 0.5 to 5%, Cu: 1 to 8%, and Mo: 0.1 to 2%. Free graphite-precipitated iron-based sintering consisting of a composition consisting of unavoidable impurities and an austenite base or a base with a slight pearlite phase in the austenite phase, and having a structure in which free graphite is deposited and grown in pores. A piston ring wear ring made of a sintered material of free graphite-precipitated iron with excellent high-temperature wear resistance characterized by being made of a material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08484098A JP3346270B2 (en) | 1998-03-31 | 1998-03-31 | Piston ring wear ring made of free graphite precipitated iron-based sintered material with excellent high temperature wear resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08484098A JP3346270B2 (en) | 1998-03-31 | 1998-03-31 | Piston ring wear ring made of free graphite precipitated iron-based sintered material with excellent high temperature wear resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11279720A JPH11279720A (en) | 1999-10-12 |
| JP3346270B2 true JP3346270B2 (en) | 2002-11-18 |
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ID=13842000
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08484098A Expired - Fee Related JP3346270B2 (en) | 1998-03-31 | 1998-03-31 | Piston ring wear ring made of free graphite precipitated iron-based sintered material with excellent high temperature wear resistance |
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| Country | Link |
|---|---|
| JP (1) | JP3346270B2 (en) |
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|---|---|---|---|---|
| WO2009119388A1 (en) | 2008-03-27 | 2009-10-01 | 日立金属株式会社 | Piston ring material for internal combustion engine |
-
1998
- 1998-03-31 JP JP08484098A patent/JP3346270B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
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