JP3502744B2 - Method of manufacturing shaft-shaped parts for machine structure with excellent fatigue characteristics - Google Patents
Method of manufacturing shaft-shaped parts for machine structure with excellent fatigue characteristicsInfo
- Publication number
- JP3502744B2 JP3502744B2 JP15422797A JP15422797A JP3502744B2 JP 3502744 B2 JP3502744 B2 JP 3502744B2 JP 15422797 A JP15422797 A JP 15422797A JP 15422797 A JP15422797 A JP 15422797A JP 3502744 B2 JP3502744 B2 JP 3502744B2
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- induction hardening
- machine structure
- manufacturing
- shot peening
- 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
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
Landscapes
- Heat Treatment Of Articles (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、機械構造用鋼を素
材とする軸状部品であるシャフトに関するもので、特に
軸方向に直角をなす穴を有する軸状部品において疲労特
性に優れた機械構造用部品の製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft, which is a shaft-shaped component made of steel for machine structural use, and particularly to a mechanical structure having excellent fatigue characteristics in a shaft-shaped component having a hole perpendicular to the axial direction. The present invention relates to a method for manufacturing a component for use.
【０００２】[0002]
【従来の技術】一般に、機械構造用軸状部品であるシャ
フト類などは、疲労強度に優れていることが要求される
ため、熱間鍛造、冷間鍛造、転造、切削などによって所
定の形状に製作後、浸炭焼入れや高周波焼入れなどの表
面硬化処理が施されることが多い。特に、高周波焼入れ
は、加工費が安く処理時間も短いという利点があり、か
つ焼入れ歪みも少なくきれいな表面ままであることか
ら、機械構造用部品の有用な強化法として注目されてい
る。2. Description of the Related Art Generally, shafts, which are shaft-like parts for machine structures, are required to have excellent fatigue strength, so that they can be formed into a predetermined shape by hot forging, cold forging, rolling, cutting or the like. After manufacturing, it is often subjected to surface hardening treatment such as carburizing and induction hardening. In particular, induction hardening has attracted attention as a useful strengthening method for mechanical structural parts because it has the advantages of low processing cost and short processing time, and has less quenching distortion and leaves a clean surface.
【０００３】近年は、自動車などの燃費低減、排ガス低
減を目的とする軽量化、またエンジンの高出力化にとも
なう機械構造用部品の高強度化が望まれるようになって
きている。こうした高強度化のニーズに対して、特に高
周波焼入れされる機械構造用部品の疲労強度を向上させ
る手段として、５０％マルテンサイト硬さが得られるま
での硬化層深さを深くする方法がとられている。従来の
機械構造用部品として使用されている炭素鋼では硬化層
深さを深くする方法として、高周波焼入れ加熱時間を長
くする必要があるが、長時間加熱をすると、結晶粒の粗
大化、表面圧縮残留応力の減少、表面硬さの低下により
疲労強度が低下するという問題があった。そのため合金
元素添加により焼入性を高め、硬化層深さを深くするこ
とが可能となり疲労強度の向上が達成されている。しか
し、現状では硬化層比ｔ／Ｒ（ｔ：５０％マルテンサイ
ト硬さまでの硬化層深さ，Ｒ：部品半径）が０．５を越
えて焼入れ深さを増加しても疲労強度の増加は飽和し、
高強度化の上限にある。In recent years, it has been desired to reduce the weight of automobiles and the like for the purpose of reducing fuel consumption and exhaust gas, and to increase the strength of mechanical structural parts accompanying the increase in output of engines. In order to meet such needs for high strength, a method of increasing the depth of the hardened layer until 50% martensite hardness is obtained is taken as a means for improving the fatigue strength of machine structural parts that are induction hardened. ing. For carbon steel used as a conventional machine structural part, it is necessary to lengthen the induction hardening heating time as a method of deepening the hardened layer depth, but if it is heated for a long time, crystal grains become coarse and surface compression occurs. There is a problem that the fatigue strength is reduced due to the reduction of residual stress and the reduction of surface hardness. Therefore, it is possible to increase the hardenability and increase the depth of the hardened layer by adding an alloy element, and the fatigue strength is improved. However, at present, even if the hardening layer ratio t / R (t: hardening layer depth up to 50% martensite hardness, R: component radius) exceeds 0.5 and the quenching depth is increased, the fatigue strength does not increase. Saturated
It is at the upper limit of high strength.
【０００４】特に軸方向に直角をなす横穴を有する軸状
部品では疲労破損起点は横穴部であり、高周波焼入れ時
に発生する圧縮残留応力は横穴のない部品に比べ低く、
硬化層深さを増加しても疲労強度の向上はわずかであ
る。また、硬化層比０．５以上の範囲において、硬化層
深さを増加させても疲労強度は逆に低下する傾向にあ
る。現在までに軸状部品の高強度化のニーズに対して、
特開平４−１４１５２１公報および特開平７−９０３７
９公報には、鋼材を高周波焼入れ後、ショットピーニン
グ処理を施し、ねじり強度の優れた軸状部品を製造する
ための方法が提案されている。しかし、上記公報に記載
された方法では、横穴を有する軸状部品の高強度化のニ
ーズに対して十分とは言えず、より高いねじり疲労強度
が得られる軸状部品の実現が望まれている。In particular, in the case of a shaft-shaped part having a lateral hole that is perpendicular to the axial direction, the fatigue damage starting point is the lateral hole, and the compressive residual stress generated during induction hardening is lower than that of a part without a lateral hole.
Even if the depth of the hardened layer is increased, the fatigue strength is slightly improved. Further, in the range of the hardened layer ratio of 0.5 or more, the fatigue strength tends to decrease conversely even if the hardened layer depth is increased. To date, to meet the needs for higher strength of shaft-shaped parts,
JP-A-4-141521 and JP-A-7-9037
No. 9, gazette proposes a method for producing a shaft-shaped part having excellent torsional strength by subjecting a steel material to induction hardening and then subjecting it to shot peening. However, the method described in the above publication cannot be said to be sufficient for the needs for increasing the strength of the shaft-shaped component having a lateral hole, and it is desired to realize a shaft-shaped component that can obtain higher torsional fatigue strength. .
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上述した従
来の問題点に着目し、横穴を有する軸状部品において疲
労特性に優れた機械構造用部品およびその製造方法を提
供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a mechanical structural part having excellent fatigue characteristics in a shaft-shaped part having a lateral hole and a method for manufacturing the same, focusing on the above-mentioned conventional problems.
【０００６】[0006]
【課題を解決するための手段】本発明による機械構造用
部品およびその製造方法は、重量％で、Ｃ：０．２５〜
０．５５％、Ｓｉ：０．３０％以下、Ｍｎ：０．２０〜
１．５０％、Ｃｒ：０．０５〜１．３０％、Ａｌ：０．
０１〜０．０６％、望ましくはＢ：０．０００５〜０．
００３５％、Ｎ：０．０１５％以下、Ｔｉ：０．０１〜
０．０５％に規制し、必要に応じてＭｏ：０．５％以
下、Ｎｉ：１．０％の１種または２種を含有し、さらに
必要に応じて被削性を向上させるためにＳ：０．０１〜
０．１０％、Ｐｂ：０．０１〜０．２０％、Ｂｉ：０．
０１〜０．３０％、Ｔｅ：０．００５〜０．１０％、Ｃ
ａ：０．０００３〜０．０１０％の１種または２種以上
を含有する高周波焼入用鋼を用いて軸方向と直角をなす
横穴を有する機械構造用軸状部品を製造する際、横穴部
の硬化層比を中実品の場合、ｔ／Ｒ＝０．５以上（ｔ：
５０％マルテンサイト硬さまでの硬化層深さ，Ｒ：部品
半径）または中空品の場合、ｔ／Ｔ＝０．５以上（Ｔ：
肉厚）に高周波焼入れを行い、さらに横穴部に粒径０．
５〜１．５ｍｍ、硬さ６００〜８５０ＨＶの投射材によ
りアークハイト０．５〜１．２ｍｍＡのショットピーニ
ング処理を施した後、粒径０．０３〜０．５ｍｍ、硬さ
６００〜８５０ＨＶの投射材をアークハイト０．１５〜
０．５０ｍｍＡのショットピーニング処理を行うか、そ
れぞれ単独でショットピーニング処理を処理を行うこと
を特徴としている。The mechanical structural component and the method for manufacturing the same according to the present invention have a C: 0.25-wt%.
0.55%, Si: 0.30% or less, Mn: 0.20
1.50%, Cr: 0.05 to 1.30%, Al: 0.
01-0.06%, preferably B: 0.0005-0.
0035%, N: 0.015% or less, Ti: 0.01 to
It is regulated to 0.05%, contains 1 or 2 kinds of Mo: 0.5% or less and Ni: 1.0% as necessary, and further contains S to improve machinability as necessary. : 0.01-
0.10%, Pb: 0.01 to 0.20%, Bi: 0.
01-0.30%, Te: 0.005-0.10%, C
a: When manufacturing a shaft-shaped component for machine structure having a lateral hole perpendicular to the axial direction by using induction hardening steel containing 0.0003 to 0.010% of one or more kinds, a lateral hole portion In the case of a solid product having a cured layer ratio of t / R = 0.5 or more (t:
Hardened layer depth up to 50% martensite hardness, R: radius of parts, or for hollow products, t / T = 0.5 or more (T:
Induction hardening (thickness), and the grain size of the horizontal hole is 0.
After shot peening treatment of arc height 0.5-1.2 mmA with a projection material of 5-1.5 mm, hardness 600-850 HV, projection of particle size 0.03-0.5 mm, hardness 600-850 HV. Arc height 0.15
The feature is that shot peening processing of 0.50 mmA is performed, or shot peening processing is performed individually.
【０００７】[0007]
【作用】本発明による機械構造用部品の製造方法におい
て素材として用いられる高周波焼入用鋼は、焼入性を増
加させる合金元素を添加し高周波焼入深さを十分確保す
るようにし、また、高周波焼入れ部の疲労き裂伝播特性
を向上させるため合金元素を調整したものである。さら
に、高周波焼入れ深さを深くし破損起点を軸表面近傍に
遷移させ、ショットピーニング処理を施し、有効に残留
応力を付与することにより疲労強度を大幅に向上させる
ものである。以下、本発明による機械構造用部品の製造
方法において素材として用いられる高周波焼入用鋼の成
分範囲、硬化層深さおよびショットピーニング処理条件
の限定理由について説明する。The induction hardening steel used as a raw material in the method of manufacturing a machine structural component according to the present invention is added with an alloying element that increases hardenability to ensure a sufficient induction hardening depth. The alloy elements are adjusted to improve the fatigue crack propagation characteristics of the induction-hardened part. Further, the induction hardening depth is deepened so that the damage starting point is transitioned to the vicinity of the shaft surface, shot peening treatment is performed, and residual stress is effectively given, thereby significantly improving fatigue strength. Hereinafter, the reasons for limiting the component range, the hardened layer depth and the shot peening treatment conditions of the induction hardening steel used as a raw material in the method for manufacturing a machine structural component according to the present invention will be described.
【０００８】Ｃ：０．２５〜０．５５％
Ｃは機械構造用部品の強度を確保するために必要な元素
であり、特に高周波焼入れによって十分な表面硬さを得
るためには０．２５％以上の含有を必要とする。しか
し、０．５５％を越すと高周波焼入れ時に焼き割れを生
じやすくなるので０．５５％以下に限定した。C: 0.25 to 0.55% C is an element necessary to secure the strength of mechanical structural parts, and 0.25% to obtain a sufficient surface hardness especially by induction hardening. The above content is required. However, if it exceeds 0.55%, quench cracking tends to occur during induction hardening, so the content is limited to 0.55% or less.
【０００９】Ｓｉ：０．３０％以下
Ｓｉは溶製時の脱酸剤として含有され、焼入れ性を向上
させる元素である。しかし、０．３０％以上を越して多
量に添加されると熱間加工時に割れを発生しやすくなる
ため、０．３０％以下に限定した。Si: 0.30% or less Si is an element contained as a deoxidizing agent during melting and improving the hardenability. However, if a large amount is added in excess of 0.30% or more, cracking tends to occur during hot working, so the content was limited to 0.30% or less.
【００１０】Ｍｎ：０．２０〜１．５０％
Ｍｎは溶製時の脱硫剤として作用する元素であり、また
焼入性を向上させる元素である。鋼の高周波焼入れ性を
改善し、かつ表面硬さを増加させるためには０．２０％
以上添加する必要がある。しかし、１．５％を越して多
量に添加しても焼入れ性は飽和し、また、熱間加工性を
低下させるために１．５％以下に限定した。Mn: 0.20 to 1.50% Mn is an element that acts as a desulfurizing agent at the time of melting and is an element that improves hardenability. 0.20% to improve induction hardenability of steel and increase surface hardness
It is necessary to add above. However, even if added in a large amount exceeding 1.5%, the hardenability is saturated, and in order to reduce the hot workability, it is limited to 1.5% or less.
【００１１】Ｃｒ：０．０５〜１．３０％
ＣｒはＭｎ焼入性の向上をさらに補い、高周波焼入によ
って十分な焼入深さを得るのに有効な元素であるので、
そのためには０．０５％以上添加する必要がある。しか
し、１．３０％を越して多量に添加しても焼入れ性は飽
和し、また、冷間加工性を劣化させるので添加するとし
ても１．３０％以下にに限定した。Cr: 0.05 to 1.30% Since Cr is an element which is more effective in complementing the improvement of Mn hardenability and obtaining a sufficient harden depth by induction hardening,
Therefore, it is necessary to add 0.05% or more. However, even if added in excess of 1.30%, the hardenability saturates, and since cold workability deteriorates, even if added, it was limited to 1.30% or less.
【００１２】Ａｌ：０．０１〜０．０６％
Ａｌは脱酸に必要な元素であるが、高周波焼入れ時の結
晶粒の粗大化を防止し、強度を向上させるとともに、高
周波焼入れ後のひずみを著しく小さくするのに有効な元
素であり、このような効果を得るために０．０１％以上
含有させた。しかし、０．０６％を越して添加すると、
鋼の靭性を低下させるので０．０６％以下に限定した。Al: 0.01 to 0.06% Al is an element necessary for deoxidation, but it prevents coarsening of crystal grains during induction hardening, improves strength, and reduces strain after induction hardening. It is an element that is effective in making it extremely small, and 0.01% or more was contained in order to obtain such effects. However, if added over 0.06%,
Since it lowers the toughness of steel, it is limited to 0.06% or less.
【００１３】Ｂ：０．０００５〜０．００３５％
Ｂは必要な高周波焼入れ深さを確保するために添加し、
さらに粒界強度を向上させる元素でもあり、このような
効果を得るためには０．０００５％以上含有させること
が必要である。しかし、量の増大とともにその効果は飽
和し、熱間加工性の低下という弊害が出てくるので、
０．００３５％以下とした。B: 0.0005 to 0.0035% B is added to secure the required induction hardening depth,
Further, it is also an element for improving the grain boundary strength, and in order to obtain such an effect, it is necessary to contain 0.0005% or more. However, as the amount increases, the effect saturates, and the adverse effect of reduced hot workability appears.
It was set to 0.0035% or less.
【００１４】Ｎ：０．０１５％以下
Ｎ含有量が多すぎると変形抵抗が増大して冷間加工性を
低下させるので、０．０１５％以下に規制することが望
ましい。N: 0.015% or less If the N content is too large, the deformation resistance increases and the cold workability deteriorates. Therefore, it is desirable to control the content to 0.015% or less.
【００１５】Ｔｉ：０．０１〜０．０５％
ＴｉはＮを固定し、Ｂ添加による焼入性の向上を確保す
るために添加する元素であり、このような効果を得るた
めには０．０１％以上含有させることが必要である。し
かし、多すぎると靭性の低下をきたすので０．０５％以
下に限定した。Ti: 0.01 to 0.05% Ti is an element added to fix N and ensure the improvement of hardenability by adding B. It is necessary that the content be 01% or more. However, if it is too large, the toughness is lowered, so the content is limited to 0.05% or less.
【００１６】Ｓ：０．０１〜０．１０％、Ｐｂ：０．０
１〜０．２０％、Ｂｉ：０．０１〜０．３０％、Ｔｅ：
０．００５〜０．１０％、Ｃａ：０．０００３〜０．０
１０％の１種以上
Ｓ、Ｐｂ、Ｂｉ、ＴｅおよびＣａは被削性を向上させる
のに有効な元素であり、必要に応じて上記の範囲で適宜
添加するのもよい。S: 0.01 to 0.10%, Pb: 0.0
1 to 0.20%, Bi: 0.01 to 0.30%, Te:
0.005-0.10%, Ca: 0.0003-0.0
One or more of 10% of S, Pb, Bi, Te and Ca are effective elements for improving machinability, and may be appropriately added within the above range if necessary.
【００１７】硬化層深さおよびショットピーニング処理
条件：硬化層比が０．５より小さいと図４（Ａ）に示す
ように破損起点が焼き境部のためショットピーニング処
理による残留応力の効果が十分得られないため、硬化層
比は０．５以上とする必要がある。さらにショットピー
ニング処理を行い表層の圧縮残留応力を増大させること
により疲労強度は向上するが、この場合、ショット粒径
が１．５ｍｍを超えると部材の表面が荒れて疲労強度が
低下する。このためショット粒径は１．５ｍｍ以下にす
る必要がある。また、ショット粒硬さが６５０ＨＶより
低いと十分な残留応力を付与することはできず、８５０
ＨＶを超えると、表面が荒れて疲労強度が低下するた
め、６００〜８５０ＨＶの投射材を使用する必要があ
る。さらに、ショットピーニング強さを最も一般的に用
いられているアルメンストリップＡを用いたときのアー
クハイトで比較すると、アークハイト値が低いと十分な
残留応力を付与することができず、高いと部品表面が荒
れて疲労強度が低下するため、ショット粒径０．５〜
１．５ｍｍでは０．５〜１．２ｍｍＡ、ショット粒径
０．０３〜０．５ｍｍでは０．１５〜０．５０ｍｍＡと
する必要がある。Hardened layer depth and shot peening treatment conditions: When the hardened layer ratio is less than 0.5, the effect of residual stress by the shot peening treatment is sufficient because the fracture starting point is the burn boundary as shown in FIG. 4 (A). Since it cannot be obtained, the cured layer ratio must be 0.5 or more. Fatigue strength is improved by further performing shot peening treatment to increase the compressive residual stress in the surface layer, but in this case, if the shot grain size exceeds 1.5 mm, the surface of the member becomes rough and the fatigue strength is reduced. Therefore, the shot grain size needs to be 1.5 mm or less. If the shot grain hardness is lower than 650 HV, sufficient residual stress cannot be applied, and
If it exceeds HV, the surface becomes rough and the fatigue strength decreases, so it is necessary to use a blast material of 600 to 850 HV. Further, comparing the shot peening strength with the arc height when using the most commonly used Almen strip A, if the arc height value is low, sufficient residual stress cannot be imparted, and if it is high, the parts Shot grain size 0.5-
It should be 0.5 to 1.2 mmA at 1.5 mm and 0.15 to 0.50 mmA at shot particle size 0.03 to 0.5 mm.
【００１８】[0018]
【実施例】本発明の効果を実施例を用いて説明する。表
１に示す化学成分の鋼を溶製した後、熱間鍛造により直
径４０ｍｍの棒材とし、焼ならし後、平行部外径２２ｍ
ｍ、平行部内径８ｍｍ、さらに４ｍｍの横穴を有するね
じり疲労試験片を加工した。その後、表２に示す条件で
高周波焼入れを行い、表３に示す条件でショットピーニ
ングを行った。このとき試験片断面の硬さ分布を測定し
表層硬さ、硬化層深さを調べた。ここで、５０％マルテ
ンサイト硬さまでの深さを硬化層深さとした。ねじり疲
労試験は２Ｈｚの正弦波トルクを負荷し、繰返し破断回
数３×１０５でのトルク値をねじり疲労強度とした。結
果を表４に示す。EXAMPLES The effects of the present invention will be described with reference to examples. After the steel with the chemical composition shown in Table 1 was melted, it was hot forged into a rod with a diameter of 40 mm, and after normalizing, the outer diameter of the parallel part was 22 m.
m, a parallel portion inner diameter 8 mm, and a torsional fatigue test piece having a lateral hole of 4 mm was processed. Then, induction hardening was performed under the conditions shown in Table 2 and shot peening was performed under the conditions shown in Table 3. At this time, the hardness distribution of the cross section of the test piece was measured to examine the surface hardness and the hardened layer depth. Here, the depth up to 50% martensite hardness was defined as the hardened layer depth. In the torsional fatigue test, a sine wave torque of 2 Hz was applied, and the torque value at the number of repeated fractures of 3 × 10 5 was taken as the torsional fatigue strength. The results are shown in Table 4.
【００１９】表４から明らかなように、本発明法による
試料はいずれも優れたねじり疲労強度を示すことがわか
る。一方、比較例３、１４、２１、２４、４２、４９で
は本発明の成分範囲を満たしているが、高周波焼入れが
浅め焼入れの処理であるため硬化層深さが浅くなってお
り、さらにショットピーニングのアークハイト値が低い
ため、十分なねじり疲労強度が得られない。さらに、比
較例１、４、４５、５０、５２、５６ではショットピー
ニングのアークハイト値は十分であるが、硬化層深さが
浅いためショットピーニングの効果が得られずねじり疲
労強度は低くなっている。比較例５８、５９、６０はＣ
含有量及びＭｎ含有量が低いために、高周波焼入れで深
め焼入れの条件においても硬化層比が０．５より小さく
なり、ねじり疲労強度が低くなっている。また、比較例
６１、６２では硬化層深さは十分であるが、Ｃ含有量が
多いため、試験片に焼割れを生じている。次に、比較例
６、９、３４、３９では硬化層深さは本発明範囲を満た
しているが、ショットピーニング処理を施していないた
めに十分な強度は得られていない。さらに比較例１０、
１５、２７、３５、４７では硬化層深さも十分でショッ
トピーニング処理も施しているが、アークハイト値が低
いためショットピーニングの十分な効果が得られず、疲
労強度は低い。As is clear from Table 4, all the samples prepared by the method of the present invention exhibit excellent torsional fatigue strength. On the other hand, Comparative Examples 3, 14, 21, 24, 42, and 49 satisfy the component range of the present invention, but the induction hardening is a process of shallow quenching, so that the depth of the hardened layer is shallow, and further shot peening is performed. Since the arc height value of is low, sufficient torsional fatigue strength cannot be obtained. Further, in Comparative Examples 1, 4, 45, 50, 52 and 56, the arc height value of shot peening is sufficient, but since the depth of the hardened layer is shallow, the effect of shot peening cannot be obtained and the torsional fatigue strength becomes low. There is. Comparative Examples 58, 59 and 60 are C
Since the content and Mn content are low, the hardened layer ratio is smaller than 0.5 and the torsional fatigue strength is low even under the conditions of deep quenching by induction hardening. Further, in Comparative Examples 61 and 62, the depth of the hardened layer is sufficient, but since the C content is large, quenching cracks have occurred in the test pieces. Next, in Comparative Examples 6, 9, 34 and 39, the hardened layer depth satisfies the range of the present invention, but sufficient strength is not obtained because the shot peening treatment is not performed. Comparative Example 10,
In Nos. 15, 27, 35 and 47, the depth of the hardened layer is sufficient and shot peening is performed, but since the arc height value is low, the sufficient effect of shot peening cannot be obtained and the fatigue strength is low.
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【表２】 [Table 2]
【００２２】[0022]
【表３】 [Table 3]
【００２３】[0023]
【表４】 [Table 4]
【００２４】[0024]
【表５】 [Table 5]
【００２５】[0025]
【発明の効果】以上の説明で明らかなように、本発明で
は高周波焼入れおよびショットピーニング処理を適用す
ることにより、横穴を有する機械構造軸状部品の疲労強
度の向上を図ることが可能となった。As is apparent from the above description, in the present invention, by applying the induction hardening and the shot peening treatment, it is possible to improve the fatigue strength of the mechanical structure axial part having the lateral hole. .
【図１】軸状部材の視野図である。FIG. 1 is a perspective view of a shaft-shaped member.
【図２】軸状部材の縦断面図である。FIG. 2 is a vertical sectional view of a shaft-shaped member.
【図３】軸状部材の高周波焼入れ後の横穴周辺の硬化
層、非硬化層を表す拡大模写図である。FIG. 3 is an enlarged copy diagram showing a hardened layer and a non-hardened layer around a lateral hole after induction hardening of a shaft-shaped member.
【図４】（Ａ）は硬化層が浅い場合の破損起点を示す模
写図である。（Ｂ）は硬化層が深い場合の破損起点を表
す模写図である。FIG. 4A is a copy diagram showing a damage starting point when the hardened layer is shallow. (B) is a copy diagram showing the starting point of damage when the hardened layer is deep.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ２２Ｃ 38/18 Ｃ２２Ｃ 38/18 38/60 38/60 (72)発明者 中村 貞行 三重県三重郡朝日町大字柿3094 (56)参考文献 特開 平７−90379（ＪＰ，Ａ) 特開 平４−141522（ＪＰ，Ａ) 特開 平４−141521（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 9/00 - 9/44 C21D 9/50 B24C 1/10 C21D 1/02 - 1/84 C21D 7/00 - 7/13 C22C 38/00 - 38/60 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI C22C 38/18 C22C 38/18 38/60 38/60 (72) Inventor Sadayuki Nakamura 3094 Kaki, Kaki, Asahi-cho, Mie-gun, Mie Prefecture ) References JP-A-7-90379 (JP, A) JP-A-4-141522 (JP, A) JP-A-4-141521 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB) Name) C21D 9/00-9/44 C21D 9/50 B24C 1/10 C21D 1/02-1/84 C21D 7/00-7/13 C22C 38/00-38/60
Claims (4)
％、Ｓｉ：０．３０％以下、Ｍｎ：０．２０〜１．５０
％、Ｃｒ：０．０５〜１．３０％、Ａｌ：０．０１〜
０．０６％、を含有する高周波焼入用鋼を用いて機械構
造用軸状部品を製造する際、軸方向に直角をなす穴部の
硬化層比を中実品の場合、ｔ／Ｒ＝０．５以上（ｔ：５
０％マルテンサイト硬さまでの硬化層深さ，Ｒ：部品半
径）あるいは中空品の場合、ｔ／Ｔ＝０．５以上（Ｔ：
肉厚）に高周波焼入れを行い、さらに前記横穴部に粒径
０．５〜１．５ｍｍ、硬さ６００〜８５０ＨＶの投射材
によりアークハイト０．５〜１．２ｍｍＡのショットピ
ーニング処理を施した後、粒径０．０３〜０．５ｍｍ、
硬さ６００〜８５０ＨＶの投射材をアークハイト０．１
５〜０．５０ｍｍＡのショットピーニング処理を行う
か、それぞれ単独でショットピーニング処理を施すこと
による機械構造用軸状部品の製造方法。1. C, 0.25-0.55, in% by weight.
%, Si: 0.30% or less, Mn: 0.20 to 1.50
%, Cr: 0.05 to 1.30%, Al: 0.01 to
When manufacturing a shaft-shaped component for machine structure using induction hardening steel containing 0.06%, in the case of a solid product, the hardening layer ratio of the hole portion perpendicular to the axial direction is t / R = 0.5 or more (t: 5
Hardened layer depth up to 0% martensite hardness, R: radius of parts, or for hollow products, t / T = 0.5 or more (T:
(Thickness) by induction hardening, and then shot peening treatment of arc height 0.5-1.2 mmA with a projection material having a grain size of 0.5-1.5 mm and hardness of 600-850 HV in the lateral hole. , Particle size 0.03-0.5 mm,
Arc height 0.1 for shot material with hardness of 600-850 HV
A method for manufacturing a shaft-shaped component for a machine structure by performing shot peening treatment of 5 to 0.50 mmA or performing shot peening treatment individually.
Ｂ：０．０００５〜０．００３５％、Ｎ：０．０１５％
以下、Ｔｉ：０．０１〜０．０５％を含有する高周波焼
入用鋼を用いることを特徴とする機械構造用軸状部品の
製造方法。2. In addition to the alloy components according to claim 1,
B: 0.0005 to 0.0035%, N: 0.015%
Hereinafter, a method for manufacturing a shaft-shaped component for machine structure, characterized in that a steel for induction hardening containing Ti: 0.01 to 0.05% is used.
分に加えて、Ｍｏ：０．５％以下、Ｎｉ：１．０％以下
の１種または２種を含有する高周波焼入用鋼を用いるこ
とを特徴とする機械構造用軸状部品。3. Induction hardening steel containing, in addition to the alloy components according to claim 1 or 2, 1 or 2 kinds of Mo: 0.5% or less and Ni: 1.0% or less. A shaft-shaped component for machine structure, characterized by using.
に記載の合金成分に加えて、重量％で、Ｓ：０．０１〜
０．１０％、Ｐｂ： ０．０１〜０．２０％、Ｂｉ：
０．０１〜０．３０％、Ｔｅ：０．００５〜０．１０
％、Ｃａ：０．０００３〜０．０１０％の１種または２
種以上を含有する高周波焼入用鋼を用いることを特徴と
した機械構造用軸状部品の製造方法。4. Claim 1 or claim 2 or claim 3.
In addition to the alloy components described in 1.
0.10%, Pb: 0.01 to 0.20%, Bi:
0.01-0.30%, Te: 0.005-0.10
%, Ca: 0.0003 to 0.010% of 1 type or 2
A method for manufacturing a shaft-shaped component for machine structure, characterized by using an induction hardening steel containing at least one kind.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15422797A JP3502744B2 (en) | 1997-05-09 | 1997-05-09 | Method of manufacturing shaft-shaped parts for machine structure with excellent fatigue characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15422797A JP3502744B2 (en) | 1997-05-09 | 1997-05-09 | Method of manufacturing shaft-shaped parts for machine structure with excellent fatigue characteristics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10310823A JPH10310823A (en) | 1998-11-24 |
| JP3502744B2 true JP3502744B2 (en) | 2004-03-02 |
Family
ID=15579639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15422797A Expired - Fee Related JP3502744B2 (en) | 1997-05-09 | 1997-05-09 | Method of manufacturing shaft-shaped parts for machine structure with excellent fatigue characteristics |
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| Country | Link |
|---|---|
| JP (1) | JP3502744B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005116284A1 (en) * | 2004-05-07 | 2005-12-08 | Sumitomo Metal Industries, Ltd. | Seamless steel pipe and method for production thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002257169A (en) * | 2001-03-02 | 2002-09-11 | East Japan Railway Co | High fatigue strength axial spring for railway vehicle |
| JPWO2007023936A1 (en) * | 2005-08-25 | 2009-03-05 | 新東工業株式会社 | Shot peening method |
| JP4589885B2 (en) * | 2006-03-03 | 2010-12-01 | 住友金属工業株式会社 | Crankshaft |
| JP2009014203A (en) * | 2008-09-17 | 2009-01-22 | Jtekt Corp | Intermediate shaft with constant velocity joints connected to both ends |
| CN102154589A (en) * | 2011-03-25 | 2011-08-17 | 中国第一汽车集团公司 | Steel for rear axle shaft of heavy-load commercial vehicle |
-
1997
- 1997-05-09 JP JP15422797A patent/JP3502744B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005116284A1 (en) * | 2004-05-07 | 2005-12-08 | Sumitomo Metal Industries, Ltd. | Seamless steel pipe and method for production thereof |
| CN100500910C (en) * | 2004-05-07 | 2009-06-17 | 住友金属工业株式会社 | Seamless steel pipe and method for production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10310823A (en) | 1998-11-24 |
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