JPH0539511A - Cam member made of sintered ceramics having excellent toughness - Google Patents
Cam member made of sintered ceramics having excellent toughnessInfo
- Publication number
- JPH0539511A JPH0539511A JP21920391A JP21920391A JPH0539511A JP H0539511 A JPH0539511 A JP H0539511A JP 21920391 A JP21920391 A JP 21920391A JP 21920391 A JP21920391 A JP 21920391A JP H0539511 A JPH0539511 A JP H0539511A
- Authority
- JP
- Japan
- Prior art keywords
- cam member
- cam
- ring material
- sintered alloy
- ceramics
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、例えば自動車などの
内燃機関や駆動機関、さらに各種ポンプなどの構造部材
であるカムシャフトを構成するカム部材に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam member which constitutes a cam shaft, which is a structural member such as an internal combustion engine or a drive engine of an automobile, and various pumps.
【０００２】[0002]
【従来の技術】近年、鋼製シャフトに取り付け固着され
るカム部材として、サイアロン基セラミックスやＳｉ3
Ｎ4 基セラミックス、さらにＳｉＣ基セラミックスやＡ
ｌ2 Ｏ3 基セラミックスなどの各種焼結セラミックス製
のものが注目されている。2. Description of the Related Art Recently, as a cam member fixedly attached to a steel shaft, sialon-based ceramics or Si 3 is used.
N 4 -based ceramics, SiC-based ceramics and A
Materials made of various sintered ceramics such as l 2 O 3 -based ceramics are drawing attention.
【０００３】[0003]
【発明が解決しようとする課題】一方、近年の上記各種
機関装置の高性能化および高速化はめざましく、これに
伴ない、これらの構造部材であるカムシャフトの使用環
境は一段と厳しさを増す状況にあるが、このカムシャフ
トを構成するカム部材が上記の焼結セラミックス製であ
ると、すぐれた耐摩耗性を示すものの、靱性不足が原因
で、これに割れが発生し易く、したがってこれに満足に
対応することができないのが現状である。On the other hand, in recent years, the performance and speed of the above various engine devices have been remarkably high, and along with this, the usage environment of the camshafts, which are these structural members, has become more severe. However, if the cam member that constitutes this camshaft is made of the above-mentioned sintered ceramics, it exhibits excellent wear resistance, but cracks easily occur due to insufficient toughness, and therefore it is satisfactory. Currently, it is not possible to deal with.
【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、靱性のすぐれた焼結セラミック
ス製カム部材を開発すべく研究を行なった結果、 （ａ）焼結セラミックス製カム部材の鋼製シャフト貫通
孔を含む中央部分（以下、カム部材の中央部分という）
を鋼製リング材で構成する試みを行なったところ、確か
にカム部材の靱性が向上するようになるが、焼結セラミ
ックス自体が難削材であるために、焼結セラミックス製
カム本体（以下カム本体という）の前記リング材との嵌
合面の寸法出しが難しく、この結果カム本体と嵌め込み
鋼製リング材との嵌着が満足に行なわれず、かつコスト
の高いものとなること。Therefore, the present inventors have
From the above viewpoint, as a result of research to develop a sintered ceramic cam member having excellent toughness, (a) a center portion of the sintered ceramic cam member including a steel shaft through hole (hereinafter referred to as a cam) (It is called the central part of the member)
However, the toughness of the cam member is certainly improved, but since the sintered ceramic itself is a difficult-to-cut material, the sintered ceramic cam body (hereinafter referred to as cam It is difficult to dimension the fitting surface of the main body) with the ring member, and as a result, the cam main body and the fitting steel ring member cannot be satisfactorily fitted together, and the cost is high.
【０００５】（ｂ）また、上記（ａ）の問題点を解決す
る目的で、カム部材の中央部分を、通常の粉末冶金法を
用いて、所定組成を有するＦｅ基合金粉末あるいは所定
組成に配合した混合粉末から圧粉体をプレス成形し、こ
の圧粉体を予め成形したカム本体に嵌め込んだ状態で焼
結することにより形成したＦｅ基焼結合金のリング材で
構成する試みも行なったが、一般にＦｅ基焼結合金は焼
結時の縮み代が大きく、この結果カム本体とＦｅ基焼結
合金リング材との間には間隙の形成が避けられず、この
場合も満足な嵌着を行なうことができないこと。(B) Further, for the purpose of solving the problem (a), the central portion of the cam member is blended with a Fe-based alloy powder having a predetermined composition or a predetermined composition by using a usual powder metallurgy method. An attempt was also made to press-compact a green compact from the mixed powder, and sinter the compact into a preformed cam body to sinter it into a ring material of a Fe-based sintered alloy. However, in general, a Fe-based sintered alloy has a large shrinkage allowance during sintering, and as a result, a gap is inevitably formed between the cam body and the Fe-based sintered alloy ring material. Inability to do.
【０００６】（ｃ）しかし、カム部材の中央部分を、重
量％で（以下％は重量％を示す）、Ｎｉ：３．５〜４．
５％、 Ｃｕ：２．５〜５％Ｃ：０．３〜１％、を含
有し、さらに、Ｃｒ：０．８〜１．２％、 Ｍｏ：
０．３〜０．７％、のうちの１種または２種、を含有
し、残りがＦｅと不可避不純物からなる組成を有するＦ
ｅ基焼結合金のリング材で構成すると、上記Ｆｅ基焼結
合金は、焼結時の寸法変化がほとんどなく、むしろ僅か
ではあるが約３％程度膨張する性質を有するので、カム
本体と上記Ｆｅ基焼結合金のリング材とは相互間に間隙
の形成なく強固に嵌着し、したがってこの結果のカム部
材の中央部分が上記Ｆｅ基焼結合金のリング材で構成さ
れたカム部材は、上記リング材によってすぐれた靱性を
具備するようになるほか、シャフト貫通孔の形成に際し
ては、上記リング材を構成するＦｅ基焼結合金は切削性
にすぐれているので、高い寸法精度のシャフト貫通孔の
形成が可能となること。 以上（ａ）〜（ｃ）に示される研究結果を得たのであ
る。(C) However, the central portion of the cam member is expressed by weight% (hereinafter,% means weight%) Ni: 3.5 to 4.
5%, Cu: 2.5 to 5% C: 0.3 to 1%, further Cr: 0.8 to 1.2%, Mo:
F having a composition of 0.3 to 0.7%, one or two of which is Fe and unavoidable impurities.
If the Fe-based sintered alloy is composed of a ring material of an e-based sintered alloy, the Fe-based sintered alloy has a characteristic that the dimensional change during sintering hardly occurs, and rather expands by about 3%, but slightly. The cam member which is firmly fitted to the ring material of the Fe-based sintered alloy without forming a gap therebetween, and thus the center portion of the resulting cam member is composed of the ring material of the Fe-based sintered alloy, The ring material has excellent toughness, and when forming the shaft through hole, the Fe-based sintered alloy forming the ring material has excellent machinability, and therefore the shaft through hole having high dimensional accuracy is provided. Can be formed. The research results shown in (a) to (c) above were obtained.
【０００７】この発明は、上記の研究結果にもとづいて
なされたものであって、カム本体が、サイアロン基セラ
ミックス、Ｓｉ3 Ｎ4 基セラミックス、ＳｉＣ基セラミ
ックス、あるいはＡｌ2 Ｏ3 基セラミックスで構成さ
れ、これに焼結嵌着され、かつカム部材の中央部分を構
成するリング材が、Ｎｉ：３．５〜４．５％、 Ｃ
ｕ：２．５〜５％、Ｃ：０．３〜１％、を含有し、さら
に、Ｃｒ：０．８〜１．２％、 Ｍｏ：０．３〜０．
７％、のうちの１種または２種、を含有し、残りがＦｅ
と不可避不純物からなる組成を有する、焼結時に収縮の
ない、むしろ僅かに膨張する嵌着性のすぐれたＦｅ基焼
結合金で構成され、これによってすぐれた靱性を具備す
るようになるカム部材に特徴を有するものである。The present invention was made based on the above research results, and the cam body is made of sialon-based ceramics, Si 3 N 4 -based ceramics, SiC-based ceramics, or Al 2 O 3 -based ceramics. The ring material that is sintered and fitted to this and that constitutes the central portion of the cam member is Ni: 3.5 to 4.5%, C
u: 2.5-5%, C: 0.3-1%, Cr: 0.8-1.2%, Mo: 0.3-0.
7%, one or two of which are Fe
A cam member composed of an Fe-based sintered alloy having a composition of unavoidable impurities and which does not shrink during sintering, and rather expands slightly and has excellent fittability, thereby providing excellent toughness. It has characteristics.
【０００８】つぎに、この発明のカム部材において、カ
ム本体に焼結嵌着されるリング材を構成するＦｅ基焼結
合金の成分組成を上記の通りに限定した理由を説明す
る。 （ａ）Ｎｉ Ｎｉ成分には、強度を向上させる作用があるが、その含
有量が３．５％未満では所望の強度向上効果が得られ
ず、一方４．５％を越えて含有させても作用が飽和し、
より一層の強度向上効果が得られないことから、その含
有量を３．５〜４．５％と定めた。Next, in the cam member of the present invention, the reason why the component composition of the Fe-based sintered alloy constituting the ring material sintered and fitted to the cam body is limited as described above will be explained. (A) Ni The Ni component has the effect of improving the strength, but if the content is less than 3.5%, the desired strength-improving effect cannot be obtained, while if it exceeds 4.5%, it is contained. The action is saturated,
Since the effect of further improving the strength cannot be obtained, the content thereof is set to 3.5 to 4.5%.
【０００９】（ｂ）Ｃｕ Ｃｕ成分には、圧粉体から焼結体への寸法変化を抑制す
る、むしろ僅かではあるが膨張させる作用があるが、そ
の含有量が２．５％未満では前記作用に所望の効果が得
られず、一方その含有量が５％を越えると硬さが急激に
低下するようになることから、その含有量を２．５〜５
％と定めた。(B) Cu The Cu component has the function of suppressing the dimensional change from the green compact to the sintered body, and rather expanding it slightly, but if its content is less than 2.5%, The desired effect is not obtained, and when the content exceeds 5%, the hardness rapidly decreases. Therefore, the content should be 2.5 to 5%.
Defined as%.
【００１０】（ｃ）Ｃ Ｃ成分には、素地に固溶して強度を向上させるほか、炭
化物を形成して硬さを向上させる作用があるが、その含
有量が０．３％未満では前記作用に所望の効果が得られ
ず、一方その含有量が１％を越えると靱性が低下するよ
うになることから、その含有量を０．３〜１％と定め
た。(C) CC The C component has the functions of forming a solid solution in the matrix to improve the strength and forming carbides to improve the hardness, but if its content is less than 0.3%, The desired effect is not obtained in the action, and on the other hand, if the content exceeds 1%, the toughness decreases, so the content was set to 0.3 to 1%.
【００１１】（ｄ）ＣｒおよびＭｏ これらの成分には、素地に固溶して焼入れ性を高めると
共に、炭化物を形成して硬さを向上させる作用がある
が、その含有量がそれぞれＣｒ：０．８％未満およびＭ
ｏ：０．３％未満では所望の硬さ向上効果が得られず、
一方その含有量がそれぞれＣｒ：１．２％およびＭｏ：
０．７％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Ｃｒ：０．８〜１．２％、
Ｍｏ：０．３〜０．７％と定めた。(D) Cr and Mo These components have the effects of forming a solid solution in the base material to enhance the hardenability and forming carbides to improve the hardness, but the respective contents are Cr: 0. Less than .8% and M
If less than 0.3%, the desired effect of improving hardness cannot be obtained,
On the other hand, the contents are Cr: 1.2% and Mo:
If it exceeds 0.7%, the strength will decrease, so that the content of each of Cr: 0.8 to 1.2%,
Mo: 0.3-0.7% was determined.
【００１２】[0012]
【実施例】つぎに、この発明のカム部材を実施例により
具体的に説明する。まず、いずれも内径：２８mm×最大
幅：３９mm×最小幅：３２mmの平面寸法、並びに１４mm
の厚さをもち、かつ内側面に厚さ方向に向って幅：２mm
×高さ：１mmの山形突条を１本形成した、サイアロン基
セラミックス、Ｓｉ3 Ｎ4 基セラミックス、ＳｉＣ基セ
ラミックス、およびＡｌ2 Ｏ3 基セラミックスで構成さ
れたカム本体を用意した。なお、上記サイアロン基セラ
ミックスは、Ｙ−Ｓｉ−Ｏ−Ｎ系ガラス質結合相：６容
量％を含有し、残りがＳｉ5.5 Ａｌ0.5 Ｏ0.5 Ｎ7.5 の
組成式をもったβ−サイアロンからなる組成、上記Ｓｉ
3 Ｎ4 基セラミックスは、Ｙ−Ｍｇ−Ｓｉ−Ｏ−Ｎ系ガ
ラス質結合相：１０容量％を含有し、残りがＳｉ3 Ｎ4
からなる組成、またＳｉＣ基セラミックスは実質的にＳ
ｉＣからなる組成、さらにＡｌ2 Ｏ3 基セラミックス
は、ＭｇＯ：１重量％を含有し、残りがＡｌ2 Ｏ3 から
なる組成をそれぞれもつものである。EXAMPLE Next, the cam member of the present invention will be specifically described by way of examples. First of all, the plane dimension of inner diameter: 28 mm x maximum width: 39 mm x minimum width: 32 mm, and 14 mm
And has a thickness of 2 mm on the inner surface in the thickness direction.
× Height: A cam body made of sialon-based ceramics, Si 3 N 4 -based ceramics, SiC-based ceramics, and Al 2 O 3 -based ceramics, in which one chevron-shaped ridge having a height of 1 mm was formed, was prepared. Incidentally, the sialon group ceramics, Y-Si-O-N-based vitreous bond phase: 6 contained volume%, the remainder consists of β- sialon having a composition formula of Si 5.5 Al 0.5 O 0.5 N 7.5 Composition , Above Si
The 3 N 4 -based ceramic contains a Y—Mg—Si—O—N-based vitreous binder phase: 10% by volume, and the rest is Si 3 N 4
And the SiC-based ceramics are substantially S
The composition of iC, and the Al 2 O 3 -based ceramics each have a composition of MgO: 1 wt% and the balance of Al 2 O 3 .
【００１３】また、原料粉末として、いずれも１０〜７
０μｍの範囲内の所定の平均粒径を有するＮｉ粉末、Ｃ
ｕ粉末、黒鉛粉末、Ｃｒ粉末、Ｍｏ粉末、およびＦｅ粉
末を用意し、これら原料粉末を表１に示される配合組成
に配合し、ボールミルで７２時間混合した後、７ton/cm
2 の圧力で外径：２８mm×内径：２２mmの平面寸法、並
びに１４mmの厚さをもち、かつ外側面に幅：２mm×深
さ：１mmのＶ型縦溝１本を設けたリング状圧粉体をプレ
ス成形した。Further, as the raw material powder, each is 10 to 7
Ni powder having a predetermined average particle size within the range of 0 μm, C
u powder, graphite powder, Cr powder, Mo powder, and Fe powder were prepared, and these raw material powders were blended to the blending composition shown in Table 1 and mixed with a ball mill for 72 hours, then 7 ton / cm
A ring-shaped powder having a planar dimension of 28 mm in outer diameter x 22 mm and a thickness of 14 mm at a pressure of 2 and a V-shaped vertical groove of width: 2 mm x depth: 1 mm provided on the outer surface. The body was press molded.
【００１４】ついで、上記各種のカム本体に、表１に示
される組合せで上記リング状圧粉体を嵌め込んた状態
で、真空中、１１８０℃に１時間保持の条件で焼結する
ことにより上記カム本体に実質的に配合組成と同一の成
分組成をもったＦｅ基焼結合金のリング材が焼結嵌着さ
れた構造をもった本発明カム部材１〜７をそれぞれ製造
した。Next, the ring-shaped green compacts are fitted into the various cam bodies in the combinations shown in Table 1 and sintered in vacuum at 1180 ° C. for 1 hour. Each of the cam members 1 to 7 of the present invention having a structure in which a ring material of a Fe-based sintered alloy having a composition substantially the same as the composition was sinter-fitted to the cam body was manufactured.
【００１５】[0015]
【表１】 [Table 1]
【００１６】この結果得られた本発明カム部材１〜７に
おけるリング材の圧粉体寸法に対する寸法変化率を測定
し、表１に示した。The resulting dimensional change rates of the ring materials of the cam members 1 to 7 of the present invention with respect to the green compact size were measured and are shown in Table 1.
【００１７】また、比較の目的で、いずれも内径（シャ
フト貫通孔径）：２２mm×最大幅：３９mm×最小幅：３
２mmの平面寸法、並びに１４mmの厚さを有し、かつ上記
組成と同じ組成をもったサイアロン基セラミックス、Ｓ
ｉ3 Ｎ4 基セラミックス、ＳｉＣ基セラミックス、およ
びＡｌ2 Ｏ3 基セラミックスで構成された従来カム部材
１〜４をそれぞれ用意した。For the purpose of comparison, the inner diameter (shaft through hole diameter) is 22 mm x maximum width: 39 mm x minimum width: 3
Sialon-based ceramics having a plane dimension of 2 mm and a thickness of 14 mm and having the same composition as described above, S
Conventional cam members 1 to 4 each composed of i 3 N 4 -based ceramics, SiC-based ceramics, and Al 2 O 3 -based ceramics were prepared.
【００１８】つぎに、これらの各種カム部材を鋼製シャ
フトに取り付けた状態で、１４００cc４気筒ＯＨＣガソ
リンエンジンに組込み、８００r.p.m の回転数で２００
時間の加速運転を行ない、本発明カム部材にあっては、
カム主体のリング材との嵌着面、従来カム部材にあって
はシャフト貫通孔面の割れ発生状況を１０時間毎に観察
し、この結果を表１に示した。Next, with these various cam members attached to the steel shaft, they were installed in a 1400cc four-cylinder OHC gasoline engine, and the rotation speed was 200 rpm at 200 rpm.
In the cam member of the present invention, which is accelerated in time,
The occurrence of cracks on the fitting surface of the cam-based ring member and the shaft through-hole surface of the conventional cam member was observed every 10 hours, and the results are shown in Table 1.
【００１９】[0019]
【発明の効果】表１に示される結果から、本発明カム部
材１〜７は、これの中央部分が、焼結前後の寸法変化が
ほとんどなく、むしろ膨張するＦｅ基焼結合金のリング
材で構成されているので、カム本体とリング材の嵌着強
度がきわめて高く、しかも前記Ｆｅ基焼結合金のリング
材によってすぐれた靭性が確保されるので、苛酷な条件
下での実用に際してもカム本体に割れが発生することが
なく、これに対して、従来カム部材１〜４は、いずれも
靭性不足が原因で比較的短時間で割れが発生することが
明らかである。From the results shown in Table 1, in the cam members 1 to 7 of the present invention, the central portion of the cam members is a ring material of a Fe-based sintered alloy that has substantially no dimensional change before and after sintering, but rather expands. Since it is configured, the fitting strength between the cam body and the ring material is extremely high, and excellent toughness is ensured by the ring material of the Fe-based sintered alloy, so that the cam body can be used even under practical conditions under severe conditions. It is clear that the conventional cam members 1 to 4 are all cracked in a relatively short time due to lack of toughness.
【００２０】上述のように、この発明のカム部材は、焼
結セラミックスからなるカム本体によってすぐれた耐摩
耗性が確保され、かつ前記カム本体に焼結嵌着されるＦ
ｅ基焼結合金のリング材によってすぐれた靭性が確保さ
れるので、苛酷な条件下での実用に際しても、割れの発
生なく著しく長期に亘ってすぐれた性能を発揮するので
ある。As described above, the cam member of the present invention has excellent wear resistance by the cam body made of sintered ceramics and is sintered and fitted to the cam body.
Since the ring material of the e-based sintered alloy ensures excellent toughness, it exhibits excellent performance for a remarkably long time without cracking even in practical use under severe conditions.
Claims (1)
フト貫通孔を含む中央部分を、重量％で、 Ｎｉ：３．５〜４．５％、 Ｃｕ：２．５〜５％、 Ｃ：０．３〜１％、 を含有し、さらに、 Ｃｒ：０．８〜１．２％、 Ｍｏ：０．３〜０．７
％、 のうちの１種または２種、を含有し、残りがＦｅと不可
避不純物からなる組成を有する、焼結時に収縮のない、
嵌着性にすぐれたＦｅ基焼結合金のリング材で構成した
ことを特徴とする靱性のすぐれた焼結セラミックス製カ
ム部材。1. A central portion including a steel shaft through hole of a sintered ceramic cam member, in% by weight, Ni: 3.5 to 4.5%, Cu: 2.5 to 5%, C: 0. 3 to 1%, Cr: 0.8 to 1.2%, Mo: 0.3 to 0.7
%, One or two of, and the balance being Fe and inevitable impurities, without shrinkage during sintering,
A cam member made of a sintered ceramics having excellent toughness, which is composed of a ring material of a Fe-based sintered alloy having excellent fittability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21920391A JPH0539511A (en) | 1991-08-05 | 1991-08-05 | Cam member made of sintered ceramics having excellent toughness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21920391A JPH0539511A (en) | 1991-08-05 | 1991-08-05 | Cam member made of sintered ceramics having excellent toughness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0539511A true JPH0539511A (en) | 1993-02-19 |
Family
ID=16731826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21920391A Withdrawn JPH0539511A (en) | 1991-08-05 | 1991-08-05 | Cam member made of sintered ceramics having excellent toughness |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0539511A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09195012A (en) * | 1996-01-19 | 1997-07-29 | Hitachi Powdered Metals Co Ltd | Wear resistant sintered alloy and its production |
-
1991
- 1991-08-05 JP JP21920391A patent/JPH0539511A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09195012A (en) * | 1996-01-19 | 1997-07-29 | Hitachi Powdered Metals Co Ltd | Wear resistant sintered alloy and its production |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981112 |