JPH06145785A - Hot peening method for carburized steel - Google Patents
Hot peening method for carburized steelInfo
- Publication number
- JPH06145785A JPH06145785A JP29739092A JP29739092A JPH06145785A JP H06145785 A JPH06145785 A JP H06145785A JP 29739092 A JP29739092 A JP 29739092A JP 29739092 A JP29739092 A JP 29739092A JP H06145785 A JPH06145785 A JP H06145785A
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- Prior art keywords
- shot peening
- gear
- shot
- hardness
- corners
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、浸炭鋼材のショットピ
ーニング処理、より詳しくは、歯車のように角部を備え
た浸炭鋼材の２段ショットピーニング法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shot peening treatment for carburized steel material, and more particularly to a two-stage shot peening method for carburized steel material having a corner like a gear.
【０００２】[0002]
【従来の技術】ショットピーニングとは、高硬度の鋼線
ショットないし鋳鋼ショットを鋼部品に投射して衝突さ
せることであり、鋼部材の疲労強度を向上させる効果が
ある。最近、機械装置の高性能化に伴い、機械構造用部
品は高速・高負荷の過酷な条件下で使用するようになっ
てきており、疲労強度を含めた部品強度を高めることが
求められている。特に、自動車産業に置いては、軽量
化、高出力エンジンへの対応などのことから、駆動系ユ
ニットを構成する歯車部品に対してもその強化が強く望
まれている。これらの歯車部品は、一般的に、浸炭処理
を施して表面を硬くし、芯部に靱性を持たせており、そ
れにショットピーニングを施すことで大幅に疲労強度を
高めることが知られている（例えば、相原、荻野、小
川、浅野；「ショットピーニングによる浸炭焼き入れ材
の疲労強度向上」、日本機械学会材料力学講演会講演論
文集 319（'90-11-28,29) 、(1990)、269-271 、特開昭
６０−２１８４２２号公報参照）。浸炭歯車に対するシ
ョットピーニングの効果については、ショット粒硬度の
影響が大きく、ショット粒硬度が高いほど高い疲労強度
が得られる傾向がある（上述の論文参照）。2. Description of the Related Art Shot peening is the projection of high hardness steel wire shots or cast steel shots onto steel parts for collision, which has the effect of improving the fatigue strength of steel members. Recently, along with the high performance of mechanical devices, machine structural parts have come to be used under severe conditions of high speed and high load, and it is required to increase the part strength including fatigue strength. . In the automobile industry, in particular, there is a strong demand for strengthening the gear parts constituting the drive system unit in view of weight reduction and compatibility with high-power engines. These gear parts are generally carburized to harden the surface and toughen the core, and shot peening is known to significantly increase fatigue strength ( For example, Aihara, Ogino, Ogawa, Asano; “Improving fatigue strength of carburized and tempered materials by shot peening”, Proc. Of the Japan Society of Mechanical Engineers, Material Mechanics Conference 319 ('90 -11-28,29), (1990), 269-271, JP-A-60-218422). Regarding the effect of shot peening on carburized gears, the effect of shot grain hardness is large, and the higher the shot grain hardness, the higher the fatigue strength tends to be obtained (see the above-mentioned paper).
【０００３】さらに、ショットピーニングを２回行う２
段ショットピーニング法が疲労強度向上効果を一層高め
る手段として有効であることも知られている（例えば、
特開昭６１−７９７１９号公報、特願平３−３１０４３
９号（平成３年１１月２６日出願）参照）。さらに、２
段ショットピーニング法を浸炭部材に適用することも知
られている（例えば、D.Tylet; Surface Eng., Nov. (1
988) 672、小野、安達；ショットピーニング技術、Vol.
3 (1992) 152参照）。Further, shot peening is performed twice.
It is also known that the step shot peening method is effective as a means for further enhancing the fatigue strength improving effect (for example,
JP-A-61-79719, Japanese Patent Application No. 3-31043
No. 9 (filed on November 26, 1991)). Furthermore, 2
It is also known to apply the step shot peening method to carburized members (for example, D. Tylet; Surface Eng., Nov. (1
988) 672, Ono, Adachi; Shot peening technology, Vol.
3 (1992) 152).
【０００４】このような２段ショットピーニングが疲労
強度向上効果を奏する理由については、１次ショットピ
ーニングにて比較的粒径の大きなショットを用いて鋼部
材表面に圧縮残留応力層の深さを増し、次の２次ショッ
トピーニングにて比較的粒径の小さなショットを用いて
最表面の圧縮残留応力を高めるとの作用によって、強度
上最適な残留応力分布形態が得られるためであろうとさ
れている。The reason why such two-step shot peening has the effect of improving fatigue strength is that the depth of the compressive residual stress layer is increased on the surface of the steel member by using shots having a relatively large grain size in the primary shot peening. It is believed that the optimum residual stress distribution form in terms of strength can be obtained by the action of increasing the compressive residual stress on the outermost surface by using a shot having a relatively small grain size in the next secondary shot peening. .
【０００５】[0005]
【発明が解決しようとする課題】本発明者は、上述の従
来技術を考慮して、浸炭歯車に対して硬度ＨＶ７００以
上の高硬度のショット粒を用いた２段ショットピーニン
グ処理を施す実験を行ったところ、適切な圧縮残留応力
分布が得られるが、歯車の角部に欠けの生じる問題のあ
ることが分かった。In consideration of the above-mentioned conventional technique, the present inventor conducted an experiment in which a carburized gear was subjected to a two-step shot peening treatment using shot grains having a hardness of HV 700 or higher. As a result, it was found that an appropriate compressive residual stress distribution could be obtained, but there was a problem that chipping occurred at the corners of the gear.
【０００６】実験の具体的な条件は次の通りであり、ま
ず、浸炭処理したハイポイドギヤ（モジュール5.０）を
用意した。この浸炭歯車に下記条件での１回目ショット
ピーニング処理を施した。 鋼線ショット粒： 平均粒径1.１mm、平均硬度ＨＶ７４
５ 噴射エア圧： 4.０kg/cm2 カバレージ： ３００％ 続いて、下記条件での２回目ショットピーニング処理を
施した。The specific conditions of the experiment are as follows. First, a carburized hypoid gear (module 5.0) was prepared. This carburized gear was subjected to the first shot peening treatment under the following conditions. Steel wire shot grains: Average grain size 1.1 mm, average hardness HV74
5 Injection air pressure: 4.0 kg / cm 2 Coverage: 300% Subsequently, a second shot peening treatment was performed under the following conditions.
【０００７】鋼線ショット粒： 平均粒径0.４mm、平均
硬度ＨＶ７４０ 噴射エア圧： 4.０kg/cm2 カバレージ： ３００％ このような２段ショットピーニング処理を施した歯車で
は、図３に示すような、最表面が高く、かつ深い２段シ
ョットピーニング特有の圧縮残留応力分布となり、この
分布は好ましい。しかしながら、図２に示すように、歯
車の歯先部１での角部（端部）に一部欠落の欠け２が発
生することがあり、これでは製品とすることができず、
不良品となってしまう。このような歯先の欠落現象にお
けるその発生メカニズム、防止方法が現在のところ良く
分かっておらず、高硬度ショット粒による２段ショット
ピーニングが疲労強度向上に極めて有効な手段であると
は分かっているものの、実際に工業的に浸炭歯車の２段
ショットピーニング処理は行われていない。Steel wire shot grains: Average grain size 0.4 mm, average hardness HV740 Jet air pressure: 4.0 kg / cm 2 Coverage: 300% A gear subjected to such two-stage shot peening treatment is shown in FIG. Such a distribution of compressive residual stress peculiar to two-step shot peening having a high outermost surface and a deep depth is preferable. However, as shown in FIG. 2, there is a case where a partly missing chip 2 occurs at a corner portion (end portion) of a tooth tip portion 1 of a gear, which cannot be a product,
It becomes a defective product. The occurrence mechanism and prevention method for such a tooth tip loss phenomenon are not well understood at present, and it is known that the two-step shot peening by high hardness shot grains is an extremely effective means for improving fatigue strength. However, the two-stage shot peening treatment of carburized gears is not actually industrially performed.
【０００８】本発明の目的は、浸炭焼入処理した鋼材、
特に、角部を有する歯車などの鋼部材に２段ショットピ
ーニング処理を施す際に、角部の破損を防止して、従来
通りの疲労強度向上を可能にするショットピーニング法
を提供することである。An object of the present invention is to provide a steel material which has been carburized and quenched,
In particular, it is an object of the present invention to provide a shot peening method capable of preventing fatigue of a corner when performing a two-step shot peening treatment on a steel member such as a gear having a corner and improving fatigue strength as in the conventional case. .
【０００９】[0009]
【課題を解決するための手段】上述の目的が、浸炭焼入
処理および焼戻し処理が施こされかつ角部を備えた浸炭
鋼材に対して、硬度ＨＶ７００以上で、粒径0.６〜1.２
mmのショット粒を用いて第１ショットピーニング処理を
施し、該浸炭鋼材を１００〜２００℃の焼戻し処理を施
し、そして、硬度ＨＶ７００以上で、粒径0.１〜0.５mm
のショット粒を用いて第２ショットピーニング処理を施
すことを特徴とする浸炭鋼材のショットピーニング法に
よって達成される。[Means for Solving the Problems] The above-mentioned object is, for a carburized steel material having a corner portion, which has been subjected to carburizing and quenching treatment and tempering treatment, having a hardness of HV 700 or more and a grain size of 0.6 to 1. Two
The first shot peening treatment is performed using 100 mm shot grains, the carburized steel material is tempered at 100 to 200 ° C., and the hardness is HV700 or more and the grain diameter is 0.1 to 0.5 mm.
The second shot peening treatment is performed by using the above shot grains.
【００１０】ショット粒の硬度がＨＶ７００程度であれ
ば、焼戻し温度を１００〜１８０℃とし、また、該硬度
がＨＶ７７０程度であれば、焼戻し温度を１３０〜２０
０℃とするのが好ましい。If the hardness of the shot grains is about HV700, the tempering temperature is 100 to 180 ° C., and if the hardness is about HV770, the tempering temperature is 130 to 20.
The temperature is preferably 0 ° C.
【００１１】[0011]
【作用】本願発明では、１次ショットピーニング処理と
２次ショットピーニング処理との間に１００〜２００℃
の焼戻しを行うことによって、疲労強度の低下をもたら
すことなく、歯先欠落を防止することができる。このよ
うな焼戻しが歯先欠落防止に有効である原因について
は、明確ではないが次のように推定される。In the present invention, the temperature is 100 to 200 ° C. between the primary shot peening treatment and the secondary shot peening treatment.
By carrying out the tempering, it is possible to prevent tooth tip loss without lowering the fatigue strength. The reason why such tempering is effective in preventing tooth tip loss is presumed as follows, although it is not clear.
【００１２】まず、ＨＶ７００以上の高硬度ショット粒
で１次ショットピーニングを施すと、浸炭焼入れ焼戻し
状態で存在していた残留オーステナイトがマルテンサイ
トに変態する。この１次ショットピーニングでのショッ
ト粒径は比較的大きくかつ高硬度であるために、通常よ
りも多量に加工誘起マルテンサイトが生成する。該マル
テンサイトは浸炭焼入れで生じたマルテンサイトとは異
なり、焼戻しが施されていないために、過飽和フェライ
ト状態であって靱性が著しく乏しい。この状態で、２次
ショットピーニングを施すと、粒径の小さい高硬度のシ
ョット粒による変形（衝撃）が最表面に集中して、低靱
性マルテンサイトにクラック発生起点が生じ、角部に欠
けが発生することになる。First, when primary shot peening is performed with high hardness shot grains having an HV of 700 or more, the retained austenite existing in the carburizing, quenching and tempering state is transformed into martensite. Since the shot grain size in the primary shot peening is relatively large and the hardness is high, a large amount of work-induced martensite is generated than usual. Unlike martensite produced by carburizing and quenching, the martensite is not tempered, and thus is in a supersaturated ferrite state and has significantly poor toughness. When secondary shot peening is performed in this state, deformation (impact) due to shot grains of small hardness and high hardness concentrates on the outermost surface, and crack initiation points occur in the low toughness martensite, resulting in chipping at the corners. Will occur.
【００１３】そこで、１次ショットピーニング処理後
に、焼戻しを行って、低靱性マルテンサイトを焼戻しマ
ルテンサイト＋ε−カーバイドに変態させ、高靱性化す
る。このことによって、２次ショットピーニングでの最
表面の変形（衝撃）に耐える（クラック発生の無い）組
織になっていると考えられる。ショット粒の硬度は高い
ほど、加工力（衝撃力）を被加工部材に与えることがで
き、ＨＶ７００以上が好ましく、この硬度よりも低い
と、圧縮残留応力の発生が必ずしも十分でなく、著しい
疲労強度の向上は望めない。Therefore, after the primary shot peening treatment, tempering is performed to transform the low toughness martensite into tempered martensite + ε-carbide, thereby increasing the toughness. It is considered that this results in a structure that can withstand deformation (impact) of the outermost surface during secondary shot peening (no cracking occurs). The higher the hardness of shot particles, the more processing force (impact force) can be applied to the work member, and HV 700 or more is preferable. If the hardness is lower than this hardness, the compressive residual stress is not always sufficiently generated and the fatigue strength is remarkable. Cannot be expected to improve.
【００１４】１次ショットピーニング時のショット粒サ
イズ（平均粒径）は、0.６mmよりも小さいと、形成する
圧縮残留応力層の厚みが十分でなく、十分な疲労強度向
上が図れない。また、1.２mmよりも大きいと、歯車にお
いては歯形に対してショット粒径が大きくなるほど歯元
に衝突しにくくなり、疲労強度向上が不十分となる。さ
らに、２次ショットピーニング時のショット粒サイズ
（平均粒径）は、0.１mmよりも小さいと、高硬度のもの
を安定して製造するのが困難であり、運動エネルギーが
小さく加工力が小さい。また、0.５mmよりも大きいと、
２段ショットピーニング本来の効果が十分に発揮できな
くなる。If the shot grain size (average grain size) at the time of primary shot peening is smaller than 0.6 mm, the thickness of the compressive residual stress layer to be formed is not sufficient and the fatigue strength cannot be sufficiently improved. On the other hand, if it is larger than 1.2 mm, in the gear, the larger the shot grain size with respect to the tooth profile, the more difficult it is to collide with the root of the gear, resulting in insufficient improvement in fatigue strength. Further, if the shot grain size (average grain size) during secondary shot peening is smaller than 0.1 mm, it is difficult to stably manufacture high hardness ones, and the kinetic energy and the working force are small. . Also, if it is larger than 0.5 mm,
The original effect of the two-stage shot peening cannot be fully exerted.
【００１５】[0015]
【実施例】以下、添付図面を参照して、本発明の実施態
様例によって本発明を詳細に説明する。 例１ 機械構造用低合金鋼（例えば、ＳＣＭ４２０）の丸棒を
切断し、熱間鍛造によって素形材を製作した。該素形材
をブランク加工し、ヘリックス・フォームによって、下
記緒元のハイポイド・リング・ギアを歯切り加工した。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings by way of example embodiments of the present invention. Example 1 A round bar of a low alloy steel for machine structure (for example, SCM420) was cut and a raw material was manufactured by hot forging. The raw material was blank-processed, and a hypoid ring gear having the following specifications was gear-cut by a helix foam.
【００１６】モジュール： 5.０ 圧力角（凸）： ２２度、 圧力角（凹）： １６
度 オフセット： ３1.７５mm 歯数： ４１ 歯底円錐角： １４度３４分 次に、有効硬化深さ0.９mmを狙って、浸炭焼入処理を
し、焼戻し処理をした。なお、最終的な表面炭素濃度は
0.８％を狙い、焼戻しを１３０℃で１時間行った。浸炭
焼入処理後の歯先部表面硬度はＨＶ７６０〜８００の範
囲であった。Module: 5.0 Pressure angle (convex): 22 degrees, Pressure angle (concave): 16
Degree offset: 31.75 mm Number of teeth: 41 Root cone angle: 14 degrees 34 minutes Next, carburizing and tempering treatments were performed aiming at an effective hardening depth of 0.9 mm. The final surface carbon concentration is
Aiming at 0.8%, tempering was performed at 130 ° C for 1 hour. The surface hardness of the tooth tip after the carburizing and quenching treatment was in the range of HV760 to 800.
【００１７】そして、該歯車に１次ショットピーニング
処理を下記条件にて行った。 鋼線ショット粒： 平均粒径1.１mm、平均硬度ＨＶ７０
０ 噴射エア圧： 4.０kg/cm2 カバレージ： ３００％ 続いて、該歯車を１時間の焼戻し処理を、温度８０〜２
２０℃の範囲で設定して、行った。Then, the primary shot peening treatment was applied to the gear under the following conditions. Steel wire shot grain: Average grain size 1.1 mm, average hardness HV70
0 Injection air pressure: 4.0 kg / cm 2 Coverage: 300% Subsequently, the gear was tempered for 1 hour at a temperature of 80-2.
The setting was performed in the range of 20 ° C.
【００１８】次に、焼戻しした歯車に２次ショットピー
ニング処理を下記条件にて行った。 鋼線ショット粒： 平均粒径0.４mm、平均硬度ＨＶ７０
０ 噴射エア圧： 4.０kg/cm2 カバレージ： ３００％ 上述した一連の処理を施こす歯車を焼戻し温度毎に３０
個として、歯先の欠けの有無を目視検査で判別し、歯先
の欠落現象の発生率を算出した。なお、算出にあたって
は、歯車１個の中で１箇所でも欠けが生じていれば、複
数箇所に欠けがあったとしても１個として数えた。この
発生率の結果を図１に示す。図１から分かるように、焼
戻し温度が１００℃以上であれば、歯先欠落発生率は０
％となり、欠けは生じない。Next, the tempered gear was subjected to secondary shot peening treatment under the following conditions. Steel wire shot grain: Average grain size 0.4mm, average hardness HV70
0 Injection air pressure: 4.0 kg / cm 2 Coverage: 300% Gears that have undergone the above series of treatments are tempered at 30 tempering temperatures.
For each piece, the presence or absence of a tooth tip chipping was determined by visual inspection, and the occurrence rate of the tooth tip chipping phenomenon was calculated. In addition, in the calculation, if there was a chip in one of the gears, it was counted as one even if there were chips in a plurality of parts. The result of this incidence is shown in FIG. As can be seen from FIG. 1, if the tempering temperature is 100 ° C. or higher, the tooth tip missing rate is 0.
%, And no chipping occurs.
【００１９】例２ 上述した例１における２次ショットピーニング処理を、
平均硬度をＨＶ７７０に高めたショット粒を用いて行
い、浸炭焼入・焼戻し、１次ショットピーニングおよび
焼戻しを例１と同じ条件にて行った。処理した歯車の歯
先欠落発生率を同様に目視検査で調べて、図２に示す結
果が得られた。図２から分かるように、ショットピーニ
ングの間の焼戻しを行わない時には、ショット粒硬度が
高くなって、欠落発生率も高くなっており、欠落発生率
が０％となる（欠けの生じなくなる）焼戻し温度が１３
０℃と、高温側に３０℃シフトしている。Example 2 The secondary shot peening process in Example 1 described above is
Using shot grains whose average hardness was increased to HV770, carburizing and tempering, primary shot peening and tempering were performed under the same conditions as in Example 1. Similarly, the rate of occurrence of missing tip of the treated gear was examined by visual inspection, and the results shown in FIG. 2 were obtained. As can be seen from FIG. 2, when the tempering is not performed during the shot peening, the shot grain hardness is high and the chipping occurrence rate is also high, and the chipping occurrence rate is 0% (the chipping does not occur) tempering Temperature is 13
There is a shift of 0 ° C and 30 ° C to the high temperature side.
【００２０】なお、平均硬度ＨＶ７７０は、現状のショ
ット粒製造技術で安定的に量産できるショット粒硬度の
上限に相当する。 例３ 例１および例２でのハイポイドギア（歯車）では、それ
自体の疲労試験を施すことが難しくので、疲労試験用に
下記緒元の平歯車を同一鋼材から製作した。The average hardness HV770 corresponds to the upper limit of the shot grain hardness that can be stably mass-produced by the current shot grain manufacturing technology. Example 3 With the hypoid gear (gear) of Example 1 and Example 2, it is difficult to carry out a fatigue test of itself, so the spur gear with the following specifications was manufactured from the same steel material for the fatigue test.
【００２１】モジュール： 2.５５ 圧力角： ２2.５度 ピッチ円径： ７9.０５mm 歯数： ３１ 次に、例１または例２における浸炭焼入・焼戻し、１次
ショットピーニング、焼戻しおよび２次ショットピーニ
ングの一連の処理を同じ条件にて行なった。そして、得
られた平歯車をパルセーター方式の疲労試験に供し、そ
の結果の疲労強度を図１および図２に示す。図１から分
かるように、疲労強度は焼戻し温度１５０℃程度から低
下し始め、１８０℃以上では低下が顕著となる。また、
図２から分かるように、疲労強度の低下は２００℃程度
から顕著になる。このような高温での焼戻しによって大
幅な疲労強度低下が起こるのは、１次ショットピーニン
グで付与された圧縮残留応力の熱的解放が大きくなるこ
とと、表面部の硬度低下が顕著になることによると考え
られる。Module: 2.55 Pressure angle: 22.5 degrees Pitch circle diameter: 79.05mm Number of teeth: 31 Next, carburizing and tempering in Example 1 or Example 1, primary shot peening, tempering and secondary A series of shot peening treatments were performed under the same conditions. Then, the obtained spur gear was subjected to a pulsator type fatigue test, and the resulting fatigue strength is shown in FIGS. 1 and 2. As can be seen from FIG. 1, the fatigue strength starts to decrease from the tempering temperature of about 150 ° C., and the decrease becomes remarkable at 180 ° C. or higher. Also,
As can be seen from FIG. 2, the decrease in fatigue strength becomes remarkable from about 200 ° C. Such a large reduction in fatigue strength due to tempering at high temperature is due to the large thermal release of the compressive residual stress imparted by primary shot peening and the remarkable reduction in hardness of the surface portion. it is conceivable that.
【００２２】[0022]
【発明の効果】以上説明したように、本発明に係る浸炭
鋼材の２段ショットピーニング法によると、歯車のよう
に角部を有する浸炭鋼部材において角部の欠けを防止し
てショットピーニングによる疲労強度向上を達成するこ
とができる。As described above, according to the two-stage shot peening method for carburized steel material according to the present invention, in a carburized steel member having a corner portion such as a gear, chipping of the corner portion is prevented to prevent fatigue due to shot peening. Strength improvement can be achieved.
【図１】２次ショットピーニング粒硬度がＨＶ７００の
場合での、１次および２次ショットピーニングの間の焼
戻し温度と、歯先欠落発生率ないし疲労強度との関係を
示すグラフである。FIG. 1 is a graph showing the relationship between the tempering temperature during primary and secondary shot peening and the tooth tip missing occurrence rate or fatigue strength in the case where the secondary shot peening grain hardness is HV700.
【図２】２次ショットピーニング粒硬度がＨＶ７７０の
場合での、１次および２次ショットピーニングの間の焼
戻し温度と、歯先欠落発生率ないし疲労強度との関係を
示すグラフである。FIG. 2 is a graph showing the relationship between the tempering temperature during primary and secondary shot peening and the tooth tip missing rate or fatigue strength when the secondary shot peening grain hardness is HV770.
【図３】従来の２段ショットピーニング処理法に基づい
て歯車を処理したときの圧縮残留応力の分布を示すグラ
フである。FIG. 3 is a graph showing a distribution of compressive residual stress when a gear is processed based on a conventional two-step shot peening processing method.
【図４】従来の２段ショットピーニング処理法に基づい
て歯車を処理したときの歯先の角部に生じる欠けを示す
歯車の部分斜視図である。FIG. 4 is a partial perspective view of a gear showing a chip occurring at a corner of a tooth tip when the gear is processed based on a conventional two-stage shot peening processing method.
１…歯先部 ２…欠け 1 ... Tooth tip 2 ... Chip
Claims (1)
れかつ角部を備えた浸炭鋼材に対して、硬度ＨＶ７００
以上で、粒径0.６〜1.２mmのショット粒を用いて第１シ
ョットピーニング処理を施し、該浸炭鋼材を１００〜２
００℃の焼戻し処理を施し、そして、硬度ＨＶ７００以
上で、粒径0.１〜0.５mmのショット粒を用いて第２ショ
ットピーニング処理を施すことを特徴とする浸炭鋼材の
ショットピーニング法。1. Hardness HV700 for a carburized steel material that has been carburized and tempered and has a corner portion.
As described above, the first shot peening treatment is performed using shot grains having a grain size of 0.6 to 1.2 mm, and the carburized steel material is treated to 100 to 2
A shot peening method for a carburized steel material, which comprises performing a tempering treatment at 00 ° C. and then performing a second shot peening treatment using a shot grain having a hardness of HV 700 or more and a grain size of 0.1 to 0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29739092A JPH06145785A (en) | 1992-11-06 | 1992-11-06 | Hot peening method for carburized steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29739092A JPH06145785A (en) | 1992-11-06 | 1992-11-06 | Hot peening method for carburized steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06145785A true JPH06145785A (en) | 1994-05-27 |
Family
ID=17845873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29739092A Pending JPH06145785A (en) | 1992-11-06 | 1992-11-06 | Hot peening method for carburized steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06145785A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5816088A (en) * | 1996-04-15 | 1998-10-06 | Suncall Corporation | Surface treatment method for a steel workpiece using high speed shot peening |
| EP1022069A2 (en) * | 1999-01-21 | 2000-07-26 | Armco Inc. | Method for manufacturing cold rolled metal strip having improved surface roughness |
| WO2003040591A1 (en) * | 2001-11-09 | 2003-05-15 | Sugiyama Chain Co.,Ltd. | Chain |
| JP2006304842A (en) * | 2005-04-26 | 2006-11-09 | Juki Corp | Sliding mechanism, looper mechanism of sewing machine, and needle bar driving mechanism of sewing machine |
| WO2006134878A1 (en) * | 2005-06-13 | 2006-12-21 | Sintokogio, Ltd. | Shot peening process |
| JP2010214494A (en) * | 2009-03-16 | 2010-09-30 | Ud Trucks Corp | Surface treatment method of metal part |
| WO2018181086A1 (en) * | 2017-03-30 | 2018-10-04 | 三菱重工コンプレッサ株式会社 | Impeller, impeller manufacturing method, and rotating machine |
-
1992
- 1992-11-06 JP JP29739092A patent/JPH06145785A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5816088A (en) * | 1996-04-15 | 1998-10-06 | Suncall Corporation | Surface treatment method for a steel workpiece using high speed shot peening |
| EP1022069A2 (en) * | 1999-01-21 | 2000-07-26 | Armco Inc. | Method for manufacturing cold rolled metal strip having improved surface roughness |
| EP1022069A3 (en) * | 1999-01-21 | 2003-01-02 | Armco Inc. | Method for manufacturing cold rolled metal strip having improved surface roughness |
| WO2003040591A1 (en) * | 2001-11-09 | 2003-05-15 | Sugiyama Chain Co.,Ltd. | Chain |
| US6881500B2 (en) | 2001-11-09 | 2005-04-19 | Sugiyama Chain Co., Ltd. | Chain |
| JP2006304842A (en) * | 2005-04-26 | 2006-11-09 | Juki Corp | Sliding mechanism, looper mechanism of sewing machine, and needle bar driving mechanism of sewing machine |
| WO2006134878A1 (en) * | 2005-06-13 | 2006-12-21 | Sintokogio, Ltd. | Shot peening process |
| US7677070B2 (en) | 2005-06-13 | 2010-03-16 | Sintokogio, Ltd. | Shot-peening process |
| JP2010214494A (en) * | 2009-03-16 | 2010-09-30 | Ud Trucks Corp | Surface treatment method of metal part |
| WO2018181086A1 (en) * | 2017-03-30 | 2018-10-04 | 三菱重工コンプレッサ株式会社 | Impeller, impeller manufacturing method, and rotating machine |
| JP2018168761A (en) * | 2017-03-30 | 2018-11-01 | 三菱重工コンプレッサ株式会社 | Impeller, impeller manufacturing method, and rotary machine |
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