JPH05239602A - High bearing pressure parts - Google Patents

High bearing pressure parts

Info

Publication number
JPH05239602A
JPH05239602A JP4075268A JP7526892A JPH05239602A JP H05239602 A JPH05239602 A JP H05239602A JP 4075268 A JP4075268 A JP 4075268A JP 7526892 A JP7526892 A JP 7526892A JP H05239602 A JPH05239602 A JP H05239602A
Authority
JP
Japan
Prior art keywords
weight
less
weq
hardness
pressure parts
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Withdrawn
Application number
JP4075268A
Other languages
Japanese (ja)
Inventor
Atsuomi Hatano
敦臣 秦野
Kunio Namiki
邦夫 並木
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.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co Ltd
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 Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Priority to JP4075268A priority Critical patent/JPH05239602A/en
Publication of JPH05239602A publication Critical patent/JPH05239602A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • Y02P10/25—Process efficiency

Abstract

PURPOSE:To manufacture high bearing pressure parts whose core part is enough in toughness though its surface hardness is high and excellent in durability by subjecting allay powder having a specified compsn. to sintering, compacting and annealing, thereafter working it into a desired parts shape and executing induction hardening. CONSTITUTION:Allay powder having a compsn. constituted of, by weight, <=2% C, 2 to 5% Cr, <=2% Si, <=2% Mn, <=2% V, <=12% Mo and <=24% W and satisfying 6<=Weq<=24 in the case of W+2Mo=Weq is subjected to sintering, compacting and annealing. Next, it is worked into parts having a desired shape and is subjected to induction hardening. In this way, the objective high fearing pressure parts whose core part is enough in toughness though its surface has high hardness and showing excellent durability can be obtd.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は歯車、プーリー、カム等
の高い面圧が及ぼされる高面圧部品に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to high surface pressure parts such as gears, pulleys and cams which are subjected to high surface pressure.

【０００２】[0002]

【従来の技術】例えば自動車においては軽量化の必要が
高まっているが、そのために動力伝達部品である歯車、
プーリー、カム等の高面圧部品に対する高強度化の要求
が増加している。2. Description of the Related Art For example, in automobiles, there is an increasing need for weight reduction. For that reason, gears which are power transmission parts,
There is an increasing demand for higher strength for high surface pressure parts such as pulleys and cams.

【０００３】従来、この種の高面圧部品の素材としては
ＪＩＳ ＳＣr ４２０Ｈ，ＳＣＭ４２０Ｈに代表される
肌焼鋼が用いられ、該肌焼鋼に浸炭熱処理を行ない、Ｈ
ＲＣ６０程度とした材料が一般に使用されていた。Conventionally, case hardening steel represented by JIS SCr 420H and SCM420H has been used as a material for high surface pressure parts of this kind, and the case hardening steel is subjected to carburizing heat treatment to obtain H.
A material having an RC of about 60 was generally used.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら上記従来
の材料では上記軽量化に伴う高面圧部品の高強度化への
要求を満たすものではなく、上記肌焼鋼の組成および処
理方法に関する高強度化のための改善案も提供されてい
るが、いずれも満足すべき結果が得られていない。However, the above-mentioned conventional materials do not satisfy the demand for higher strength of the high surface pressure component due to the weight reduction, and the higher strength relating to the composition and treatment method of the case-hardening steel. Although there are suggestions for improvement, the results have not been satisfactory.

【０００５】一方調質処理や浸炭焼入れ焼戻し処理は油
焼入れ時の油煙の発生等の点で作業環境上好ましいもの
ではなく、また上記熱処理には長時間を要するため、コ
スト低減のための工程のインライン化には不向きである
と云う問題点がある。On the other hand, the tempering treatment and the carburizing quenching and tempering treatment are not preferable in the working environment in terms of the generation of oil smoke during oil quenching, and the above heat treatment requires a long time, which is a cost reduction process. There is a problem that it is not suitable for in-line.

【０００６】[0006]

【課題を解決するための手段】本発明は上記従来の課題
を解決するための手段として、Ｃ：２重量％以下、Ｃr
：２〜５重量％、Ｓi ：２重量％以下、Ｍn ：２重量
％以下、Ｖ：２重量％以下、Ｍo ：１２重量％以下、
Ｗ：２４重量％以下でＷ＋２Ｍo ＝Ｗeqとした時６≦Ｗ
eq≦２４である組成を有する合金粉末を焼結、成形、焼
きなましした後、所望の部品形状に加工してから高周波
焼入れを施した高面圧部品を提供するものであり、更に
上記合金組成にはＣo ：１５重量％以下および／または
Ｎi ：５重量％以下が添加されてもよく、また更に上記
合金組成にはＰb ：０．０２〜０．２重量％、Ｂi ：
０．０１〜０．１５重量％、Ｃa ：０．００１０〜０．
０１重量％、Ｔe ：０．００５〜０．１０重量％、Ｓ：
０．０５重量％以下が添加されてもよい。また更に上記
合金組成にはＰb ：０．０２〜０．２重量％、Ｂi ：
０．０１〜０．１５重量％、Ｃa ：０．００１０〜０．
０１重量％、Ｔe ：０．００５〜０．１０重量％、Ｓ：
０．０５重量％以下に加えてＣo ：１５重量％以下およ
び／またはＮi ：５重量％以下が添加されてもよい。The present invention provides a means for solving the above-mentioned conventional problems by C: 2% by weight or less, Cr
: 2 to 5% by weight, Si: 2% by weight or less, Mn: 2% by weight or less, V: 2% by weight or less, Mo: 12% by weight or less,
W: 6 ≦ W when W + 2Mo = Weq at 24% by weight or less
The present invention provides a high surface pressure component in which alloy powder having a composition of eq ≦ 24 is sintered, molded, annealed, processed into a desired component shape, and then induction hardened. May be added in an amount of Co: 15% by weight or less and / or Ni: 5% by weight or less. Further, Pb: 0.02-0.2% by weight, Bi:
0.01-0.15% by weight, Ca: 0.0010-0.
01% by weight, Te: 0.005 to 0.10% by weight, S:
0.05 wt% or less may be added. Further, in the above alloy composition, Pb: 0.02 to 0.2% by weight, Bi:
0.01-0.15% by weight, Ca: 0.0010-0.
01% by weight, Te: 0.005 to 0.10% by weight, S:
In addition to 0.05 wt% or less, Co: 15 wt% or less and / or Ni: 5 wt% or less may be added.

【０００７】以下に本発明における各成分の＜限定理由
＞について詳述する。 〔Ｃ：２重量％以下〕Ｃを２重量％以下と限定している
のは、２重量％より多量に含有させると靱性が劣化して
しまうことによる。<Reason for limitation> of each component in the present invention will be described in detail below. [C: 2% by weight or less] The reason why C is limited to 2% by weight or less is that if the content of C is more than 2% by weight, the toughness deteriorates.

【０００８】〔Ｃr ：２〜５重量％〕Ｃr は炭化物形成
元素であってその量が２重量％より少ないと炭化物の生
成が不足し、また耐摩耗性が小さくなる。逆に５重量％
より多量に含有させると製造性が低下してしまう。[Cr: 2 to 5% by weight] Cr is a carbide forming element, and if the amount is less than 2% by weight, the formation of carbide is insufficient and wear resistance is reduced. On the contrary, 5% by weight
If contained in a larger amount, the manufacturability will decrease.

【０００９】〔Ｓi ：２重量％以下〕Ｓi の含有量が２
重量％より多いとセメンタイトの黒鉛化により脆化が起
こり、また可鍛性が劣化する。そこで本発明では２重量
％以下とする。[Si: 2% by weight or less] The content of Si is 2
If it exceeds 5% by weight, embrittlement occurs due to graphitization of cementite and the malleability deteriorates. Therefore, in the present invention, the amount is 2% by weight or less.

【００１０】〔Ｍn ：２重量％以下〕Ｍn はその量が２
重量％より多くなると焼割れ、残留オーステナイトの生
成による脆化が起こる。[Mn: 2% by weight or less] The amount of Mn is 2
If it exceeds 5% by weight, quenching cracks and embrittlement due to the formation of retained austenite occur.

【００１１】〔Ｖ：２重量％以下〕Ｖはその量が２重量
％より多量になると焼入れ性が低下し、また製造性が低
下する。[V: 2% by weight or less] When the amount of V is more than 2% by weight, the hardenability is lowered and the manufacturability is lowered.

【００１２】〔Ｍo ：１２重量％以下，Ｗ：２４重量％
以下〕Ｍo およびＷは夫々１２重量％以下，２４重量％
以下とすることによってコスト増大、製造性低下を避け
ることが出来る。[Mo: 12% by weight or less, W: 24% by weight
Below] Mo and W are 12% by weight or less and 24% by weight, respectively
By setting the following, it is possible to avoid an increase in cost and a decrease in productivity.

【００１３】〔６重量％≦Ｗeq≦２４重量％〕Ｗeqは焼
入れ後の硬さおよび炭化物の生成量を確保するためのも
ので、そのためには６重量％以上であることが望ましい
が、２４重量％を越えると焼きなまし後の硬さがＨＲＣ
３５以下を確保出来ず、加工性が低下する。[6 wt% ≤ Weq ≤ 24 wt%] Weq is for ensuring the hardness after quenching and the amount of formation of carbides, and for that purpose it is desirable to be 6 wt% or more, but 24 wt% %, The hardness after annealing will be HRC.
If it is less than 35, the workability is deteriorated.

【００１４】〔Ｃo ：１５重量％以下〕Ｃo を１５重量
％以下としているのは、コスト増を避け、また脆化が起
こるのを防止するためである。[Co: 15% by weight or less] The reason why Co is set to 15% by weight or less is to avoid cost increase and to prevent embrittlement.

【００１５】〔Ｎi ：５重量％以下〕Ｎi を５重量％以
下に限定しているのはコスト増を避け、また残留オース
テナイトの生成による脆化を防ぐためである。[Ni: 5 wt% or less] The reason why Ni is limited to 5 wt% or less is to avoid an increase in cost and to prevent embrittlement due to the formation of retained austenite.

【００１６】〔Ｐb ：０．０２〜０．２重量％、Ｂi ：
０．０１〜０．１５重量％、Ｃa ：０．００１０〜０．
０１重量％、Ｔe ：０．００５〜０．１０重量％、Ｓ：
０．０５重量％以下〕上記元素はいずれも被削性を改善
するための元素であり、下限未満ではその効果が顕著で
なく、また上限を越えると熱間加工性や靱性が低下す
る。[Pb: 0.02 to 0.2% by weight, Bi:
0.01-0.15% by weight, Ca: 0.0010-0.
01% by weight, Te: 0.005 to 0.10% by weight, S:
0.05 wt% or less] All of the above elements are elements for improving machinability, and if the amount is less than the lower limit, the effect is not remarkable, and if it exceeds the upper limit, hot workability and toughness are deteriorated.

【００１７】本発明の高面圧部品を製造するには、上記
組成の合金粉末を焼成、成形、焼きなましした後、所望
の部品形状に加工するのであるが、この場合には焼結鍛
造、静水圧（ＨＩＰ）鍛造、機械加工等の周知の成形加
工方法が適用される。所望の部品形状に加工した後は高
周波焼入れを行なう。In order to manufacture the high surface pressure component of the present invention, the alloy powder having the above composition is fired, molded and annealed, and then processed into a desired component shape. In this case, sintering forging and static Well-known forming methods such as hydraulic (HIP) forging and machining are applied. After processing into a desired part shape, induction hardening is performed.

【００１８】[0018]

【作用】本発明において、上記組成の合金粉末を用い成
形焼成、焼きなましをした後所望の部品形状に加工した
部品を高周波焼入れすると、該部品の表面のみ高硬度に
なり、心部は焼きなましのまゝの状態を維持するから靱
性がある。In the present invention, when an alloy powder having the above-mentioned composition is molded, fired and annealed, and then a part processed into a desired part shape is induction hardened, only the surface of the part becomes high in hardness, and the core is annealed. It maintains toughness and is tough.

【００１９】[0019]

【実施例】表１に示す組成を有する合金粉末Ａ〜Ｑ（Ａ
〜Ｍ：本発明合金、Ｎ〜Ｑ：比較合金）を焼結し鍛造に
よって球状化し、焼きなましを行なった後平歯車に加工
し、実施例Ｏを除いては周波数：１００ＫＨz, 電力：
１２．６ＫＶ×５．５Ａ，加熱時間：６．３秒，冷却：
１００℃の水による湯冷の条件で高周波焼入れを行ない
実施例Ｏについては浸炭処理を行なった。EXAMPLES Alloy powders A to Q (A having the composition shown in Table 1)
.About.M: alloys of the present invention, N.about.Q: comparative alloys), spheroidized by forging, annealed and processed into spur gears, except for Example O, frequency: 100 KHz, power:
12.6KV × 5.5A, heating time: 6.3 seconds, cooling:
Induction hardening was carried out under the condition of hot water cooling at 100 ° C., and Example O was carburized.

【００２０】このようにして製造した平歯車について、
動力循環式の歯車疲れ試験機を用いて疲れ強さおよびピ
ッティング発生の有無を調べた。その結果を表２に示
す。With respect to the spur gear thus manufactured,
The fatigue strength and the occurrence of pitting were investigated using a power circulation type gear fatigue tester. The results are shown in Table 2.

【００２１】[0021]

【表１】 [Table 1]

【００２２】[0022]

【表２】 [Table 2]

【００２３】表２によれば本発明合金Ａ〜Ｍはいずれも
高い疲れ強さおよび表面硬度（ピッティング発生が無
い）を示すが、Ａ組成で高周波焼入れの代わりに通常の
焼入れ焼きなましを行なったＡ* は心部まで硬度が高く
なり、被削性に劣りかつ歯車は高いトルク域で全損し、
Ｗeqが限定範囲以下であるＮ（Ｓ５５Ｃ）およびＰは焼
入れ後の心部硬さが極めて低く、表面硬さも低いのでピ
ッティングが発生し、また疲れ強さも低い。According to Table 2, all of the alloys A to M of the present invention show high fatigue strength and surface hardness (no pitting), but ordinary quenching and annealing was performed instead of induction hardening with the A composition. A * has high hardness up to the core, is inferior in machinability, and the gear is totally damaged in the high torque range.
N (S55C) and P having a Weq of not more than the limited range have extremely low core hardness after quenching and have low surface hardness, so that pitting occurs and fatigue strength is low.

【００２４】また浸炭処理を行なったＯ（ＳＭ４２０）
はＷeqが限定範囲以下であり、焼入れ後の心部硬さは高
いが表面硬さが低くピッティングが発生しかつ加工性も
充分でなく、更に疲れ強さも低いものとなる。更にＷeq
が限定範囲よりも高いＱでは焼入れ後の心部が高硬度と
なり、被削性が不良でかつ高トルク域で歯が一部全損す
る。Further, carburized O (SM420)
Has a Weq of not more than the limited range, the core hardness after quenching is high, but the surface hardness is low, pitting occurs, the workability is not sufficient, and the fatigue strength is low. Further Weq
When Q is higher than the limited range, the core after quenching has a high hardness, the machinability is poor, and some teeth are totally damaged in the high torque range.

【００２５】[0025]

【発明の効果】したがって本発明の高面圧部品は表面は
高硬度であるが、心部は靱性に富み優れた耐久性を示
す。Therefore, the surface of the high surface pressure component of the present invention has high hardness, but the core has high toughness and excellent durability.

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】Ｃ：２重量％以下、Ｃr ：２〜５重量％、
Ｓi ：２重量％以下、Ｍn ：２重量％以下、Ｖ：２重量
％以下、Ｍo ：１２重量％以下、Ｗ：２４重量％以下で
Ｗ＋２Ｍo ＝Ｗeqとした時６≦Ｗeq≦２４である組成を
有する合金粉末を焼結、成形、焼きなましした後、所望
の部品形状に加工してから高周波焼入れを施したことを
特徴とする高面圧部品1. C: 2% by weight or less, Cr: 2-5% by weight,
Si: 2% by weight or less, Mn: 2% by weight or less, V: 2% by weight or less, Mo: 12% by weight or less, W: 24% by weight or less, and when W + 2Mo = Weq, 6 ≦ Weq ≦ 24. A high surface pressure component characterized in that the alloy powder it possesses is sintered, shaped, annealed, processed into the desired component shape, and then induction hardened. 【請求項２】請求項１の合金組成に更にＣo ：１５重量
％以下および／またはＮi ：５重量％以下が添加されて
いる高面圧部品2. A high surface pressure component in which Co: 15 wt% or less and / or Ni: 5 wt% or less is further added to the alloy composition of claim 1. 【請求項３】請求項１の合金組成に更にＰb ：０．０２
〜０．２重量％、Ｂi：０．０１〜０．１５重量％、Ｃa
：０．００１０〜０．０１重量％、Ｔe ：０．００５
〜０．１０重量％、Ｓ：０．０５重量％以下が添加され
る高面圧部品3. The alloy composition of claim 1 further comprising Pb: 0.02.
-0.2 wt%, Bi: 0.01-0.15 wt%, Ca
: 0.0010 to 0.01% by weight, Te: 0.005
-0.10 wt%, S: 0.05 wt% or less high surface pressure parts 【請求項４】請求項３の合金組成に更にＣo ：１５重量
％以下および／またはＮi ：５重量％以下が添加されて
いる高面圧部品4. A high surface pressure component in which Co: 15% by weight or less and / or Ni: 5% by weight or less is further added to the alloy composition of claim 3.
JP4075268A 1992-02-25 1992-02-25 High bearing pressure parts Withdrawn JPH05239602A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4075268A JPH05239602A (en) 1992-02-25 1992-02-25 High bearing pressure parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4075268A JPH05239602A (en) 1992-02-25 1992-02-25 High bearing pressure parts

Publications (1)

Publication Number Publication Date
JPH05239602A true JPH05239602A (en) 1993-09-17

Family

ID=13571312

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4075268A Withdrawn JPH05239602A (en) 1992-02-25 1992-02-25 High bearing pressure parts

Country Status (1)

Country Link
JP (1) JPH05239602A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0908257A2 (en) * 1997-10-07 1999-04-14 Bt Magnet-Technologie Gmbh Process for preparing a toothed pinion with collar
NL1012328C2 (en) * 1999-06-15 2000-12-22 Skf Eng & Res Centre Bv CVT / IVT part.
NL1016811C2 (en) * 2000-12-06 2002-06-13 Skf Ab Roller bearing comprising a part obtained with powder metallurgy technique.
JP2002528646A (en) * 1998-10-30 2002-09-03 エラスティール クロスター アクチボラグ Steel, use of the steel, articles made of the steel, and method of making the steel
JP2008248307A (en) * 2007-03-30 2008-10-16 Kubota Corp High toughness and high speed steel-base sintered alloy
JP2010537050A (en) * 2007-08-22 2010-12-02 ケステック イノベーションズ エルエルシー Secondary hardened gear steel
EP2286114A2 (en) * 2008-05-07 2011-02-23 Infinitrak, LLC Variator

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0908257A2 (en) * 1997-10-07 1999-04-14 Bt Magnet-Technologie Gmbh Process for preparing a toothed pinion with collar
EP0908257A3 (en) * 1997-10-07 2002-07-03 Bt Magnet-Technologie Gmbh Process for preparing a toothed pinion with collar
JP4703005B2 (en) * 1998-10-30 2011-06-15 エラスティール クロスター アクチボラグ Steel, use of the steel, product made of the steel and method for producing the steel
JP2002528646A (en) * 1998-10-30 2002-09-03 エラスティール クロスター アクチボラグ Steel, use of the steel, articles made of the steel, and method of making the steel
NL1012328C2 (en) * 1999-06-15 2000-12-22 Skf Eng & Res Centre Bv CVT / IVT part.
WO2000077268A3 (en) * 1999-06-15 2001-06-28 Skf Eng & Res Centre Bv Ivt component
WO2002048565A3 (en) * 2000-12-06 2002-10-03 Skf Ab Rolling bearing comprising a powder metallurgical component
US7018107B2 (en) 2000-12-06 2006-03-28 Ab Skf Rolling bearing comprising a powder metallurgical component
NL1016811C2 (en) * 2000-12-06 2002-06-13 Skf Ab Roller bearing comprising a part obtained with powder metallurgy technique.
JP2008248307A (en) * 2007-03-30 2008-10-16 Kubota Corp High toughness and high speed steel-base sintered alloy
JP2010537050A (en) * 2007-08-22 2010-12-02 ケステック イノベーションズ エルエルシー Secondary hardened gear steel
EP2286114A2 (en) * 2008-05-07 2011-02-23 Infinitrak, LLC Variator
EP2286114A4 (en) * 2008-05-07 2011-04-20 Infinitrak Llc Variator

Similar Documents

Publication Publication Date Title
JP6098732B2 (en) Manufacturing method of carburized steel parts and carburized steel parts
US9890446B2 (en) Steel for induction hardening roughly shaped material for induction hardening
JPH08311607A (en) Low strain carburized gear excellent in deddendum bending strength and its production
JP7152832B2 (en) machine parts
JP2006307271A (en) Case hardening steel having excellent crystal grain coarsening resistance and cold workability and in which softening can be obviated, and method for producing the same
JP2001073072A (en) Carbo-nitrided parts excellent in pitching resistance
JP3006034B2 (en) High strength mechanical structural members with excellent surface pressure strength
JPH06172867A (en) Production of gear excellent in impact fatigue life
JPH05239602A (en) High bearing pressure parts
JP2002212672A (en) Steel member
JP7270343B2 (en) Method for manufacturing mechanical parts
JP2934485B2 (en) High-strength gear steel and high-strength gear that can be rapidly carburized
JP2006307270A (en) Case hardening steel having excellent crystal grain coarsening resistance and cold workability, and method for producing the same
JP2004285384A (en) High strength carburized component
JPH10147814A (en) Production of case hardening steel product small in heat treating strain
JPH07188895A (en) Manufacture of parts for machine structure use
JP4536327B2 (en) Nb-containing case-hardened steel with excellent carburizing properties in a short time
JPH08260039A (en) Production of carburized and case hardened steel
JP3901504B2 (en) Case-hardened steel, case-hardened steel and machine structural parts with excellent cold workability and hardenability
JP4821582B2 (en) Steel for vacuum carburized gear
JP2021006659A (en) Steel component and method for producing the same
JPH06212368A (en) Low alloy sintered steel excellent in fatigue strength and its production
JP2021088751A (en) Rolling component and production method thereof
JP7310723B2 (en) Steel part and its manufacturing method
JP7111029B2 (en) Method for manufacturing steel parts

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: 19990518