JPH07145445A - Cast iron for cylinder liner - Google Patents
Cast iron for cylinder linerInfo
- Publication number
- JPH07145445A JPH07145445A JP29353093A JP29353093A JPH07145445A JP H07145445 A JPH07145445 A JP H07145445A JP 29353093 A JP29353093 A JP 29353093A JP 29353093 A JP29353093 A JP 29353093A JP H07145445 A JPH07145445 A JP H07145445A
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- cylinder liner
- resistance
- seizure resistance
- liner
- 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
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は高温耐摩耗性および耐焼
付性に優れたシリンダライナ用鋳鉄に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cast iron for a cylinder liner which has excellent high temperature wear resistance and seizure resistance.
【0002】[0002]
【従来の技術】内燃機関のシリンダ内周面に使用される
薄肉シリンダライナは、ピストンリングと摺動し、気密
性を保持しなければならず、ライナ材としては基本的に
高温における耐摩耗性と耐焼付性とが要求される。従
来、この目的のため、シリンダライナ材として、組織中
にA型黒鉛を有し、耐摩耗性向上元素としてCr, B,
Pなどを含有する特殊鋳鉄が用いられている。また、ラ
イナの鋳造は、従来、A型黒鉛を晶出させるため、凝固
速度を低くすることができる砂型置注鋳造や砂型遠心力
鋳造が適用されていたが、特公昭58−36664号公
報に開示されているように金型遠心力鋳造によっても製
造されるようになってきた。2. Description of the Related Art A thin-walled cylinder liner used for the inner peripheral surface of a cylinder of an internal combustion engine must slide against a piston ring to maintain airtightness. And seizure resistance are required. Conventionally, for this purpose, a cylinder liner material has A-type graphite in its structure, and Cr, B, and
Special cast iron containing P or the like is used. Further, in the liner casting, conventionally, sand mold casting and sand mold centrifugal casting, which can reduce the solidification rate, have been applied in order to crystallize A-type graphite. As disclosed, it has also come to be manufactured by die centrifugal casting.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、近年、
燃費の低減のみならず、潤滑油量の低減をも目的とする
エンジンの開発が指向されており、摺動面の耐摩耗性、
耐焼付性の条件がより厳しくなってきた。また、ディー
ゼルエンジンの排気ガス規制に対応するため、NOx・
PMの低減が求められており、このためには燃料を可及
的に完全燃焼させる必要がある。そして、燃料の完全燃
焼を図るため、燃料と空気との混合を促進するように、
燃料を高圧噴射して噴霧状にすることが行われている。
かかる技術においては、シリンダの内圧が上昇するた
め、特に耐焼付性の向上が求められる。However, in recent years,
The aim is to develop an engine not only for reducing fuel consumption but also for reducing the amount of lubricating oil.
The conditions for seizure resistance have become more severe. Also, in order to comply with exhaust gas regulations of diesel engines, NOx
The reduction of PM is required, and for this purpose, it is necessary to burn the fuel as completely as possible. Then, in order to achieve complete combustion of the fuel, to promote the mixing of the fuel and air,
BACKGROUND ART Fuel is injected at high pressure to be atomized.
In such a technique, since the internal pressure of the cylinder rises, it is particularly required to improve the seizure resistance.
【0004】本発明はかかる問題に鑑みなされたもの
で、優れた高温耐摩耗性と耐焼付性とを備えたシリンダ
ライナ用鋳鉄を提供することを目的とする。The present invention has been made in view of the above problems, and an object of the present invention is to provide a cast iron for a cylinder liner having excellent high temperature wear resistance and seizure resistance.
【0005】[0005]
【課題を解決するための手段】本発明のシリンダライナ
用鋳鉄は、化学組成が重量%で、C :3.1〜3.8
%、 Si:2.8〜3.5%、Mn:1.0〜
1.8%、 P :0.1〜0.4%、Cr:0.
15〜0.5%、 B :0.02〜0.06%、お
よび残部が実質的にFeからなる。The cast iron for a cylinder liner of the present invention has a chemical composition of wt% and C: 3.1 to 3.8.
%, Si: 2.8 to 3.5%, Mn: 1.0 to
1.8%, P: 0.1 to 0.4%, Cr: 0.
15 to 0.5%, B: 0.02 to 0.06%, and the balance substantially Fe.
【0006】[0006]
【作用】本発明のシリンダライナ用鋳鉄の化学組成は以
下の理由により限定される。単位は重量%である。 C:3.1〜3.8% Cは、黒鉛晶出および炭化物形成のために必要であり、
3.1%未満では黒鉛が晶出し難くなると共に炭化物量
も減少し、耐摩耗性、耐焼付性が低下する。一方、3.
8%を越えると機械的性質及び耐摩耗性がともに低下す
る。The chemical composition of the cast iron for cylinder liner of the present invention is limited for the following reasons. The unit is% by weight. C: 3.1-3.8% C is necessary for graphite crystallization and carbide formation,
If it is less than 3.1%, it is difficult to crystallize graphite and the amount of carbides is reduced, so that wear resistance and seizure resistance are deteriorated. On the other hand, 3.
If it exceeds 8%, both mechanical properties and wear resistance are deteriorated.
【0007】Si:2.8〜3.5% Siは黒鉛を晶出させるために必要で、また基地に固溶
して耐焼付性を向上させる。2.8%未満ではかかる作
用が不足し、耐焼付性が低下する。一方、3.5を越え
るとフエライトの生成が過多となり、機械的性質が低下
し、また耐焼付性向上効果も飽和する。Si: 2.8-3.5% Si is necessary for crystallizing graphite, and it forms a solid solution in the matrix to improve seizure resistance. If it is less than 2.8%, such action is insufficient and seizure resistance is reduced. On the other hand, when it exceeds 3.5, ferrite is excessively produced, mechanical properties are deteriorated, and the seizure resistance improving effect is saturated.
【0008】Mn:1.0〜1.8% Mnは硬度向上のために添加され、またSiと同様、基
地に固溶して耐焼付性を向上させる。1.0%未満では
その作用が過少であり、一方1.8%を越えると硬度が
高くなり過ぎ、加工性が低下する。 P:0.1〜0.4% Pはリン共晶(ステダイト) を生成させるために必要で
あり、0.1%未満では共晶量が過少で硬度向上効果が
ほとんどなく、一方0.4%を越えると共晶量が過多と
なって脆くなる。Mn: 1.0 to 1.8% Mn is added to improve hardness, and like Si, it forms a solid solution in the matrix to improve seizure resistance. If it is less than 1.0%, its effect is too small, while if it exceeds 1.8%, the hardness becomes too high and the workability deteriorates. P: 0.1 to 0.4% P is necessary for forming a phosphorus eutectic (stedite), and if it is less than 0.1%, the eutectic amount is too small and the hardness improving effect is almost zero. If it exceeds%, the eutectic amount becomes excessive and the material becomes brittle.
【0009】Cr:0.15〜0.5% Crはクロムカーバイドを生成させ、硬度の向上、耐摩
耗性の向上のために添加され、0.15%未満ではその
効果がほとんどなく、一方0.5%を越えるとカーバイ
ド量が過多となって加工性が低下する。 B:0.02〜0.06% Bはカーバイドの析出を促進する作用をなし、0.02
%未満ではその効果が期待できず、一方0.06%を越
えるとカーバイドの析出が過多となり、硬度が高くなり
過ぎる。Cr: 0.15 to 0.5% Cr forms chromium carbide and is added for the purpose of improving hardness and wear resistance. If it is less than 0.15%, it has almost no effect, while 0 is added. If it exceeds 0.5%, the amount of carbide becomes excessive and workability deteriorates. B: 0.02 to 0.06% B acts to promote the precipitation of carbide and is 0.02
If it is less than 0.1%, the effect cannot be expected. On the other hand, if it exceeds 0.06%, the precipitation of carbide becomes excessive and the hardness becomes too high.
【0010】本発明の鋳鉄は以上の合金成分のほか、残
部が実質的にFeで形成される。尚、Sは材質を脆くす
るので少ない程望ましく、S:0.1%以下に止めてお
くのがよい。In addition to the above alloy components, the balance of the cast iron of the present invention is substantially Fe. Since S makes the material brittle, it is desirable that the content be small, and it is preferable to keep S: 0.1% or less.
【0011】[0011]
【実施例】下記表1の化学組成を有する鋳鉄を溶製し、
鋳込温度1400℃、金型回転数1800rpmで金型
遠心力鋳造し、外径90mmφ、肉厚8mm、長さ1800
mmのライナ素材を得た。尚、鋳造に際し、金型予熱温度
を200℃とし、ウェットスプレーコーティングによ
り、ケイソウ土を主材とし、水ガラスを粘結材とした厚
さ0.8mmの塗型を金型内周面に形成された。EXAMPLE A cast iron having the chemical composition shown in Table 1 below was melted,
Centrifugal die casting at a casting temperature of 1400 ° C and a die rotation speed of 1800 rpm, outer diameter 90 mmφ, wall thickness 8 mm, length 1800
Got mm liner material. During casting, the mold preheating temperature was set to 200 ° C, and wet spray coating was used to form a 0.8 mm thick coating mold with diatomaceous earth as the main material and water glass as a binder on the inner peripheral surface of the mold. Was done.
【0012】[0012]
【表1】 [Table 1]
【0013】上記ライナ素材より、組織観察用試料を採
取し、顕微鏡観察したところ、いずれの試料も組織中に
A型黒鉛の晶出が認められた。また、同素材を切断して
長さ200mmの円筒状ライナ試料を得、これを仕上加工
して、高温乾式摩耗試験および耐焼付性試験に供した。
高温乾式摩耗試験は、科研式摩耗試験機を用い、試料を
周速0.25m/sec で軸心回りに回転させ、外表面に
初期オイルを塗布後にふき取り、先端接触部が半径10
mmのアールで形成された加圧部材(材質17Cr鋼、C
rメッキ施工) を6kgの荷重をかけて押し付け、4時間
当りの摩耗量を測定した。この場合、試料の軸心に棒状
のヒータを挿入して、試料温度を180℃に保持した。
一方、耐焼付性試験は、超高圧摩耗試験機を用い、リン
グ材(材質17Cr鋼、Crメッキ施工) を軸心回りに回
転させ、その端面にリング材と同心状に配置されたライ
ナ試料の端面を押し付けて、荷重を初期20kg/cm2 か
ら順次増加し、各荷重を3分間保持し、焼付発生時の面
圧を求めた。リング材とライナ試料との接触部には、モ
ーターオイル#30(油温80℃) を400cc/min で
給油した。試験結果を下記表2に示す。Samples for texture observation were taken from the liner material and observed under a microscope. As a result, crystallization of A-type graphite was observed in the texture of all the samples. Further, the same material was cut to obtain a cylindrical liner sample having a length of 200 mm, which was subjected to finish processing and subjected to a high temperature dry wear test and a seizure resistance test.
For the high temperature dry abrasion test, a Kaken abrasion tester was used, the sample was rotated around the axis at a peripheral speed of 0.25 m / sec, and the outer surface was wiped off after the initial oil was applied.
Pressurizing member made of radius mm (material 17Cr steel, C
r plating process) was applied with a load of 6 kg and the amount of wear per 4 hours was measured. In this case, a rod-shaped heater was inserted in the axis of the sample to keep the sample temperature at 180 ° C.
On the other hand, for the seizure resistance test, a ring material (material 17Cr steel, Cr-plated) was rotated around the axis using an ultra-high pressure abrasion tester, and a liner sample concentrically arranged with the ring material was attached to the end surface of the ring material. The end face was pressed, the load was increased sequentially from the initial 20 kg / cm 2 , each load was held for 3 minutes, and the surface pressure when seizure occurred was determined. Motor oil # 30 (oil temperature 80 ° C.) was supplied to the contact portion between the ring material and the liner sample at 400 cc / min. The test results are shown in Table 2 below.
【0014】[0014]
【表2】 [Table 2]
【0015】表2より、本発明の実施例に係るNo. 1〜
3は、従来例のNo. 4に対して、高温乾式摩耗量に優
れ、耐焼付性は50%程度以上の向上が認められる。From Table 2, No. 1 to No. 1 according to the embodiment of the present invention
No. 3 is superior to No. 4 of the conventional example in high temperature dry wear amount, and seizure resistance is improved by about 50% or more.
【0016】[0016]
【発明の効果】以上説明した通り、本発明のシリンダラ
イナ用鋳鉄は、C:3.1〜3.8%、Si:2.8〜
3.5%、Mn:1.0〜1.8%を含有した特定の成
分で形成したので、従来に比して高温耐摩耗性及び耐焼
付性を著しく向上させることができた。As described above, the cast iron for a cylinder liner of the present invention has C: 3.1 to 3.8% and Si: 2.8 to.
Since it was formed of a specific component containing 3.5% and Mn: 1.0 to 1.8%, it was possible to remarkably improve the high temperature wear resistance and seizure resistance as compared with the conventional case.
Claims (1)
%、 Mn:1.0〜1.8%、 P :0.1〜0.4
%、 Cr:0.15〜0.5%、 B :0.02〜0.
06%、 および残部が実質的にFeからなることを特徴とするシ
リンダライナ用鋳鉄。1. The chemical composition is% by weight, C: 3.1 to 3.8%, Si: 2.8 to 3.5.
%, Mn: 1.0 to 1.8%, P: 0.1 to 0.4
%, Cr: 0.15 to 0.5%, B: 0.02 to 0.
A cast iron for a cylinder liner, characterized in that it is 06% and the balance is substantially Fe.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29353093A JPH07145445A (en) | 1993-11-24 | 1993-11-24 | Cast iron for cylinder liner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29353093A JPH07145445A (en) | 1993-11-24 | 1993-11-24 | Cast iron for cylinder liner |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07145445A true JPH07145445A (en) | 1995-06-06 |
Family
ID=17795942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP29353093A Pending JPH07145445A (en) | 1993-11-24 | 1993-11-24 | Cast iron for cylinder liner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07145445A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009001841A1 (en) | 2007-06-26 | 2008-12-31 | Incorporated National University Iwate University | Flaky graphite cast iron, and method for production thereof |
CN103131945A (en) * | 2013-03-26 | 2013-06-05 | 河南中原吉凯恩气缸套有限公司 | Boron-containing low-carbon bainite cylinder jacket and preparation method thereof |
KR20140029284A (en) | 2012-08-30 | 2014-03-10 | 닛폰 피스톤 린구 가부시키가이샤 | Cylinder liner |
KR20140116326A (en) * | 2013-03-22 | 2014-10-02 | 두산인프라코어 주식회사 | High strength flake graphite iron having excellent workability and preparation method |
CN105803303A (en) * | 2016-03-29 | 2016-07-27 | 中原内配集团股份有限公司 | Cylinder liner of air conditioning compressor and preparation method of cylinder liner |
-
1993
- 1993-11-24 JP JP29353093A patent/JPH07145445A/en active Pending
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009001841A1 (en) | 2007-06-26 | 2008-12-31 | Incorporated National University Iwate University | Flaky graphite cast iron, and method for production thereof |
EP2166119A1 (en) * | 2007-06-26 | 2010-03-24 | Incorporated National University Iwate University | Flaky graphite cast iron, and method for production thereof |
EP2166119A4 (en) * | 2007-06-26 | 2011-10-05 | Nat University Iwate Univ Inc | Flaky graphite cast iron, and method for production thereof |
CN103122432A (en) * | 2007-06-26 | 2013-05-29 | 国立大学法人岩手大学 | Flaky graphite cast iron, and method for production thereof |
JP5229743B2 (en) * | 2007-06-26 | 2013-07-03 | 国立大学法人岩手大学 | Flake graphite cast iron and method for producing the same |
US8956565B2 (en) | 2007-06-26 | 2015-02-17 | Incorporated National University Iwate University | Flake graphite cast iron and production method thereof |
KR20140029284A (en) | 2012-08-30 | 2014-03-10 | 닛폰 피스톤 린구 가부시키가이샤 | Cylinder liner |
KR20140116326A (en) * | 2013-03-22 | 2014-10-02 | 두산인프라코어 주식회사 | High strength flake graphite iron having excellent workability and preparation method |
CN103131945A (en) * | 2013-03-26 | 2013-06-05 | 河南中原吉凯恩气缸套有限公司 | Boron-containing low-carbon bainite cylinder jacket and preparation method thereof |
CN105803303A (en) * | 2016-03-29 | 2016-07-27 | 中原内配集团股份有限公司 | Cylinder liner of air conditioning compressor and preparation method of cylinder liner |
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