JPH06104846B2 - Cast iron sliding member and manufacturing method thereof - Google Patents

Cast iron sliding member and manufacturing method thereof

Info

Publication number
JPH06104846B2
JPH06104846B2 JP32284588A JP32284588A JPH06104846B2 JP H06104846 B2 JPH06104846 B2 JP H06104846B2 JP 32284588 A JP32284588 A JP 32284588A JP 32284588 A JP32284588 A JP 32284588A JP H06104846 B2 JPH06104846 B2 JP H06104846B2
Authority
JP
Japan
Prior art keywords
graphite
cast iron
sliding member
particle size
iron sliding
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.)
Expired - Fee Related
Application number
JP32284588A
Other languages
Japanese (ja)
Other versions
JPH02166225A (en
Inventor
裕史 浅井
茂三 大崎
義史 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP32284588A priority Critical patent/JPH06104846B2/en
Priority to DE19893941338 priority patent/DE3941338A1/en
Priority to KR1019890018762A priority patent/KR930006291B1/en
Publication of JPH02166225A publication Critical patent/JPH02166225A/en
Publication of JPH06104846B2 publication Critical patent/JPH06104846B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は自動車用エンジン等に使用される鋳鉄製摺動部
材及びその製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a cast iron sliding member used in an automobile engine or the like, and a method for manufacturing the sliding member.

（従来の技術） 最近の自動車用エンジンの高出力化に伴い、自動車用エ
ンジン部品のうちカムシャフトやタペット等のように耐
摩耗性を必要とする摺動部材は苛酷な条件が求められて
いる。(Prior Art) With the recent increase in output of automobile engines, harsh conditions are required for sliding members that require wear resistance, such as camshafts and tappets, among automobile engine parts. .

そこで、このような苛酷な条件を対処するため、鋳鉄製
摺動部材の製造方法として、従来の冷やし金チル化処理
による方法に代えて、摺動部を高エネルギービームで再
溶融してチル化する方法が提案されている。Therefore, in order to cope with such harsh conditions, as a method of manufacturing cast iron sliding members, instead of the conventional method of chilling chilled gold, the sliding part is remelted with a high-energy beam to be chilled. The method of doing is proposed.

さらに近時は、特開昭58−50354号公報に示されるよう
に、剛性に優れている球状黒鉛鋳鉄の素材を使用し、こ
の素材の摺動部を前記のように高エネルギービームで再
溶融してチル化処理する方法が提案されている。Furthermore, recently, as shown in JP-A-58-50354, a material of spheroidal graphite cast iron, which has excellent rigidity, is used, and the sliding portion of this material is remelted with a high energy beam as described above. Then, a method for chilling is proposed.

（発明が解決しようとする課題） ところが、球状黒鉛鋳鉄を再溶融して得た摺動部材は、
残留Mgの脱酸作用によりブローホールが発生し難く、ま
た、剛性が高いという特徴を有している反面、球状黒鉛
の粒径が大きい場合には、再溶融処理後に球状黒鉛鋳鉄
黒鉛が未溶融状態で残留して耐ピッチング性を悪化させ
るという問題がある。(Problems to be solved by the invention) However, the sliding member obtained by remelting the spheroidal graphite cast iron is
Blowholes are less likely to occur due to the deoxidizing action of residual Mg, and they have the characteristics of high rigidity.However, when the particle size of spheroidal graphite is large, the spheroidal graphite cast iron graphite is not melted after remelting treatment. There is a problem that it remains in the state and deteriorates the pitting resistance.

前記に鑑みて、本発明は、ブローホールがなく且つ剛性
が高いと共に、耐ピッチング性に優れた球状黒鉛鋳鉄が
得られるようにすることを目的とする。In view of the above, it is an object of the present invention to provide a spheroidal graphite cast iron that has no blowholes, high rigidity, and excellent pitting resistance.

〔課題を解決するための手段） 前記の目的を達成するため、本発明は、素材における球
状黒鉛の粒数を限定すると共に、再溶融後の球状黒鉛の
粒径を限定するものである。[Means for Solving the Problems] In order to achieve the above object, the present invention limits the number of spherical graphite particles in the raw material and the particle diameter of the spherical graphite after remelting.

具体的に請求項１の発明が講じた解決手段は、鋳鉄製摺
動部材の製造方法を、黒鉛粒数が300個/mm2以上である
球状黒鉛鋳鉄製摺動部材の素材を鋳造し、この素材の摺
動部を高エネルギービームにより再溶融してチル化し、
再溶融後の黒鉛粒径を15μｍ以下に設定する構成とする
ものである。Specifically, the solving means taken by the invention of claim 1 is a method for producing a cast iron sliding member, in which a raw material of a spheroidal graphite cast iron sliding member having a graphite particle number of 300 / mm 2 or more is cast, The sliding part of this material is remelted by the high energy beam and chilled,
The graphite particle size after remelting is set to 15 μm or less.

また、請求項２の発明が講じた解決手段は、摺動部を有
する鋳鉄製摺動部材を対象とし、前記摺動部は、黒鉛粒
数が300個/mm2以上である球状黒鉛鋳鉄製摺動部材の素
材が高エネルギービームにより再溶融してチル化される
ことによって形成されており、再溶融後の前記摺動部の
黒鉛の粒径は15μｍ以下に設定されている構成とするも
のである。Further, the solving means devised by the invention of claim 2 is intended for a cast iron sliding member having a sliding portion, wherein the sliding portion is made of spheroidal graphite cast iron having a number of graphite particles of 300 / mm 2 or more. The material of the sliding member is formed by being remelted and chilled by a high energy beam, and the particle size of graphite of the sliding portion after remelting is set to 15 μm or less. Is.

（作用） 請求項１又は２の構成により、球状黒鉛鋳鉄製摺動部材
の素材における黒鉛粒数が300個/mm2以上であり、且
つ、再溶融後の黒鉛粒径が15μｍ以下に設定されている
ので、鋳鉄製摺動部材は耐ピッチング性が優れている。
また、この鋳鉄製摺動部材は、球状黒鉛鋳鉄であるか
ら、ブローホールが発生し難いと共に剛性が高い。(Operation) According to the configuration of claim 1 or 2, the number of graphite particles in the material of the spheroidal graphite cast iron sliding member is 300 / mm 2 or more, and the graphite particle size after remelting is set to 15 μm or less. Therefore, the cast iron sliding member has excellent pitting resistance.
Further, since this cast iron sliding member is made of spheroidal graphite cast iron, blowholes are unlikely to occur and the rigidity is high.

（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Hereinafter, the Example of this invention is described based on drawing.

本発明は、球状黒鉛の粒数が300個/mm2以上である球状
黒鉛鋳鉄製摺動部材の素材を鋳造し、この素材の摺動部
を高エネルギービームにより再溶融してチル化し、再溶
融後の黒鉛粒径を15μｍ以下に設定するものである。The present invention is a spheroidal graphite cast iron material having a number of spheroidal graphite particles of 300 / mm 2 or more is cast, and the sliding portion of this material is re-melted and chilled by a high energy beam, The particle size of graphite after melting is set to 15 μm or less.

本発明に至る前段階として、重量比でC:3.4％、Si:2.6
％、Mn:0.3％、Cu:0.3％、Mg:0.045％、残部がFeよりな
る鋳鉄材料を準備した。次に、これらの鋳鉄材料を鋳造
法を代えたり、接種を行なったりして、第３図（イ）及
び（ロ）に示す形状（長さ:150mm、直径:29mmの丸棒
状）で、第１表の第２欄に示す黒鉛粒数及び第３欄に示
す黒鉛粒径を有する第１〜第５の供試材を得た。Before the present invention, the weight ratio of C: 3.4%, Si: 2.6
%, Mn: 0.3%, Cu: 0.3%, Mg: 0.045%, and the balance was Fe. Next, by changing the casting method or inoculating these cast iron materials, the shape (round length 150 mm, diameter 29 mm round bar shape) shown in Fig. 3 (a) and (b) First to fifth test materials having the number of graphite particles shown in the second column of Table 1 and the graphite particle size shown in the third column were obtained.

第１の供試材としては砂型鋳造法により、黒鉛粒数:110
個/mm2、黒鉛粒径:40μｍの素材を得た。 The number of graphite particles is 110 as the first test material by the sand casting method.
A material having a number of particles / mm 2 and a graphite particle size of 40 μm was obtained.

第２の供試材としては同じく砂型鋳造法により、黒鉛粒
数:236個/mm2、黒鉛粒径:24μｍの素材を得た。As the second test material, a material having the number of graphite particles: 236 / mm 2 and the particle size of graphite: 24 μm was obtained by the same sand casting method.

第３の供試材としては注湯流接種を行ない、黒鉛粒数:4
45個/mm2、黒鉛粒径:12μｍの素材を得た。The third test material was pouring flow inoculation and the number of graphite particles was 4
A material having 45 particles / mm 2 and a graphite particle size of 12 μm was obtained.

第４の供試材としては金型鋳造法により、黒鉛粒数:73
4:個/mm2、黒鉛粒径:10μｍの素材を得た。The fourth test material was a mold casting method, and the number of graphite particles was 73
A material of 4: pieces / mm 2 , graphite particle size: 10 μm was obtained.

第５の供試材としては同じく金型鋳造法により、黒鉛粒
数:989個/mm2、黒鉛粒径:9μｍの素材を得た。As the fifth test material, a material having a graphite particle number of 989 pieces / mm 2 and a graphite particle diameter of 9 μm was obtained by the same die casting method.

次に、これら第１〜第５の供試材に対して、200℃に予
熱した後、中央の50mmの長さの部分に高エネルギービー
ム処理であるTIG処理を行なった。その結果、第１表の
第４欄及び第５欄に示すように、第１の供試材は黒鉛
数:42個/mm2、黒鉛粒径:36、第２の供試材は黒鉛粒径:2
04個/mm2、黒鉛粒径20μｍ、第３の供試材は黒鉛粒数:2
30個/mm2、黒鉛粒径:10μｍ、第４の供試材は黒鉛数:21
9個/mm2、黒鉛粒径:8μｍ、第５の供試材は黒鉛粒数:28
4個/mm2、黒鉛粒径:8μｍとなった。Next, these first to fifth test materials were preheated to 200 ° C., and then subjected to TIG treatment which is a high energy beam treatment on the central portion having a length of 50 mm. As a result, as shown in columns 4 and 5 of Table 1, the number of graphite in the first test material was 42 pieces / mm 2 , the particle size of graphite was 36, and the second test material was graphite particles. Diameter: 2
04 pieces / mm 2 , graphite particle size is 20 μm, and the number of graphite particles in the third sample is 2
30 pieces / mm 2 , graphite particle size: 10 μm, 4th sample: 21 graphite
9 pieces / mm 2 , graphite particle size: 8 μm, 5th sample: 28 graphite particles
4 particles / mm 2 , graphite particle size: 8 μm.

次に、これらの供試材を第３図の一点鎖線で示すような
形状（中央部の直径:28mm）に機械加工して、テストピ
ース１を得た。その後、ピッチングテスターを用いて第
４図に示すように、SUJ鋼２（直径130mm）と摺動させて
ピッチングテストを行なった。この結果は第１表の第６
欄に示すとおりであって、ピッチング強度（Kgf/mm2）
は、第１供試材は205、第２供試材は210、第３供試材は
255、第４供試材は260、第５供試材は260であった。Next, these test materials were machined into a shape (a diameter of the central part: 28 mm) as shown by the alternate long and short dash line in FIG. 3 to obtain a test piece 1. Then, as shown in FIG. 4, a pitching test was conducted by sliding it with SUJ steel 2 (diameter 130 mm) using a pitching tester. This result is shown in Table 1
As shown in the column, pitching strength (Kgf / mm 2 )
Is 205 for the first test material, 210 for the second test material, and 3 for the third test material.
255, the fourth test material was 260, and the fifth test material was 260.

第１図は前記のピッチングテストによるTIG処理前の黒
鉛粒数とピッチング強度との関係を示す。この第１図か
ら明らかなように、TIG処理前の黒鉛粒数が300個/mm2未
満になると急にピッチング強度が低下する。この結果、
TIG処理前の黒鉛粒数が300個/mm2以上の素材を再溶融す
ると耐ピッチング性に優れることが判った。FIG. 1 shows the relationship between the number of graphite particles and the pitching strength before TIG treatment by the above-mentioned pitching test. As is clear from FIG. 1, when the number of graphite particles before TIG treatment is less than 300 / mm 2 , the pitching strength suddenly decreases. As a result,
The number of graphite grains before TIG process has been found to be excellent in pitting resistance when remelted 300 / mm 2 or more materials.

再溶融前の黒鉛粒数が300個/mm2以上の素材は、いわゆ
るインモールド接種や注湯流接種を行なったり、或い
は、金型鋳造を行なったりすることにより得られる。A material having a number of graphite particles of 300 / mm 2 or more before remelting can be obtained by so-called in-mold inoculation, pouring-flow inoculation, or die casting.

第２図は前記ピッチングテストによるTIG処理後の黒鉛
粒径とピッチング強度との関係を示す。この第２図から
明らかなように、TIG処理後の黒鉛粒径が15μｍ以下に
なると急にピッチング強度が向上する。この結果、TIG
処理後の黒鉛粒径を15μｍ以下に設定すると耐ピッチン
グ性に優れることが判った。FIG. 2 shows the relationship between the graphite grain size and the pitching strength after TIG treatment by the pitching test. As is clear from FIG. 2, when the graphite particle size after TIG treatment becomes 15 μm or less, the pitching strength is rapidly improved. As a result, TIG
It was found that when the graphite particle size after the treatment was set to 15 μm or less, the pitting resistance was excellent.

（発明の効果） 以上説明したように、請求項１の発明に係る鋳鉄製摺動
部材の製造方法によると、球状黒鉛の粒数が300個/mm2
以上である素材を鋳造し、この素材の再溶融後の黒鉛粒
径を15μｍ以下に設定しているので、ブローホールがな
く且つ剛性が高いと共に、耐ピッチング性にも優れた球
状黒鉛鋳鉄製摺動部材を簡易に製造することができる。(Effect of the Invention) As described above, according to the method for manufacturing a cast iron sliding member according to the invention of claim 1, the number of spheroidal graphite particles is 300 / mm 2.
Since the above materials are cast and the graphite particle size after remelting is set to 15 μm or less, there is no blow hole and the rigidity is high, and the spheroidal graphite cast iron slide is also excellent in pitting resistance. The moving member can be easily manufactured.

また、請求項２の発明に係る鋳鉄製摺動部材の摺動部
は、黒鉛粒数が300個/mm2以上である球状黒鉛鋳鉄製摺
動部材の素材が高エネルギービームにより再溶融してチ
ル化されており、再溶融後の摺動部の黒鉛の粒径は15μ
ｍ以下に設定されているので、ブローホールがなく且つ
剛性が高いと共に、耐ピッチング性にも優れている。Further, in the sliding portion of the cast iron sliding member according to the invention of claim 2, the raw material of the spheroidal graphite cast iron sliding member in which the number of graphite particles is 300 pieces / mm 2 or more is remelted by the high energy beam. It is chilled, and the particle size of graphite in the sliding part after remelting is 15μ
Since it is set to m or less, there are no blowholes, high rigidity, and excellent pitting resistance.

【図面の簡単な説明】[Brief description of drawings]

第１図はTIG処理前の黒鉛粒数とピッチング強度との関
係を示す図、第２図はTIG処理後の黒鉛粒径とピッチン
グ強度との関係を示す図、第３図（イ）及び（ロ）は供
試材の形状を示し、（イ）は正面図、（ロ）は側面図、
第４図はピッチングテストを示す断面図である。FIG. 1 is a diagram showing the relationship between the number of graphite particles before the TIG treatment and the pitching strength, FIG. 2 is a diagram showing the relationship between the graphite particle size after the TIG treatment and the pitching strength, FIG. 3 (a) and ( (B) shows the shape of the test material, (a) is a front view, (b) is a side view,
FIG. 4 is a sectional view showing a pitching test.

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】黒鉛粒数が300個/mm2以上である球状黒鉛
鋳鉄製摺動部材の素材を鋳造し、この素材の摺動部を高
エネルギービームにより再溶融してチル化し、再溶融後
の黒鉛粒径を15μｍ以下に設定することを特徴とする鋳
鉄製摺動部材の製造方法。1. A material for a spheroidal graphite cast iron sliding member having a graphite particle number of 300 / mm 2 or more is cast, and the sliding portion of this material is remelted by a high energy beam to be chilled and remelted. A method for producing a cast iron sliding member, characterized in that the subsequent graphite particle size is set to 15 μm or less. 【請求項２】摺動部を有する鋳鉄製摺動部材であって、
前記摺動部は、黒鉛粒数が300個/mm2以上である球状黒
鉛鋳鉄製摺動部材の素材が高エネルギービームにより再
溶融してチル化されることによって形成されており、再
溶融後の前記摺動部の黒鉛の粒径は15μｍ以下に設定さ
れていることを特徴とする鋳鉄製摺動部材。2. A cast iron sliding member having a sliding portion,
The sliding portion is formed by remelting and chilling the material of the spheroidal graphite cast iron sliding member in which the number of graphite particles is 300 pieces / mm 2 or more, and after remelting. The cast iron sliding member is characterized in that the grain size of graphite in the sliding portion is set to 15 μm or less.
JP32284588A 1988-12-20 1988-12-20 Cast iron sliding member and manufacturing method thereof Expired - Fee Related JPH06104846B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP32284588A JPH06104846B2 (en) 1988-12-20 1988-12-20 Cast iron sliding member and manufacturing method thereof
DE19893941338 DE3941338A1 (en) 1988-12-20 1989-12-14 Improving wear and pin-hole corrosion properties of cast iron - by remelting surface of casting and quenching to reduce size of modular graphite
KR1019890018762A KR930006291B1 (en) 1988-12-20 1989-12-18 Manufacture of sliding member made or cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32284588A JPH06104846B2 (en) 1988-12-20 1988-12-20 Cast iron sliding member and manufacturing method thereof

Publications (2)

Publication Number Publication Date
JPH02166225A JPH02166225A (en) 1990-06-26
JPH06104846B2 true JPH06104846B2 (en) 1994-12-21

Family

ID=18148244

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32284588A Expired - Fee Related JPH06104846B2 (en) 1988-12-20 1988-12-20 Cast iron sliding member and manufacturing method thereof

Country Status (3)

Country Link
JP (1) JPH06104846B2 (en)
KR (1) KR930006291B1 (en)
DE (1) DE3941338A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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DE4309870A1 (en) * 1993-03-26 1994-09-29 Audi Ag Process for remelting surface areas of workpieces
CN106319338B (en) 2016-08-31 2018-03-20 西安理工大学 A kind of self-lubricating bearing and preparation method thereof

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JPS5850354A (en) * 1981-09-07 1983-03-24 Toyota Motor Corp Cam shaft made of spherical graphite cast iron

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KR930006291B1 (en) 1993-07-12
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JPH02166225A (en) 1990-06-26
DE3941338A1 (en) 1990-06-21

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