JPH059584A - Heat treatment of outer ring of uniform-speed universal joint - Google Patents
Heat treatment of outer ring of uniform-speed universal jointInfo
- Publication number
- JPH059584A JPH059584A JP3185497A JP18549791A JPH059584A JP H059584 A JPH059584 A JP H059584A JP 3185497 A JP3185497 A JP 3185497A JP 18549791 A JP18549791 A JP 18549791A JP H059584 A JPH059584 A JP H059584A
- Authority
- JP
- Japan
- Prior art keywords
- stem
- outer peripheral
- peripheral surface
- hardness
- hardened layer
- 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
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
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、自在継手の外輪のステ
ム部を強化する熱処理方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a heat treatment method for strengthening a stem portion of an outer ring of a universal joint.
【0002】[0002]
【従来の技術】等速自在継手の外輪の中で、固定型ボー
ルジョイントなどの鋼製の外輪では、外輪の内面にはボ
ールなどの転動体が転走する数条の転走溝が刻設され
て、その表面には焼入れ焼戻しによる硬化層が形成され
ており、転動体による転走溝の磨耗・剥離を防止して、
転動寿命を保障している。また外輪にステム部を一体に
突設する方式で、ステム部の外周面にセレーション等の
歯型部が刻設されているものがあるが、外部伝動軸部材
の中空部に挿入嵌合される歯型部の変形破壊を防止し、
ステム部の疲労強度を保障するために歯型部を含むステ
ム部外周面には、焼入れ焼戻しによる硬化層が形成され
ている。2. Description of the Related Art Among constant-velocity universal joint outer rings, steel outer rings such as fixed ball joints are provided with several rolling grooves on the inner surface of which the rolling elements such as balls roll. The hardened layer formed by quenching and tempering is formed on the surface of the rolling element to prevent the rolling groove from being worn or separated by the rolling element.
Guaranteed rolling life. Also, there is a method in which the stem portion is integrally projected on the outer ring, and there is one in which a tooth shape portion such as serration is carved on the outer peripheral surface of the stem portion, but it is inserted and fitted into the hollow portion of the external transmission shaft member. Prevents deformation and destruction of the tooth model,
In order to ensure the fatigue strength of the stem portion, a hardened layer formed by quenching and tempering is formed on the outer peripheral surface of the stem portion including the toothed portion.
【0003】外輪に硬化層を形成するための従来の熱処
理方法としては、外輪のマウス部内面とステム部外周面
とをそれぞれ個別に高周波焼入れをして、焼入れ硬化層
を形成し、次にその外輪を電気炉内に装入して、加熱保
持して焼入れ硬化層を焼戻す方法が採られていた。この
熱処理により、マウス部内面の焼戻し硬化層の表面硬度
は、高速高負荷の等速自在継手において転がり寿命の観
点から要求される硬さ、ロックウェルC硬度HRC60〜
64の範囲に容易に調整することができるものであっ
た。また、焼戻しは、連続炉による連続操業によるもの
で、炉内雰囲気により外輪を一体に加熱するので、焼戻
し温度制御が容易であり、生産性・経済性にも優れてい
た。As a conventional heat treatment method for forming a hardened layer on the outer ring, the inner surface of the mouth portion of the outer ring and the outer peripheral surface of the stem portion are individually induction hardened to form a hardened layer, and then the hardened layer is formed. A method has been adopted in which the outer ring is placed in an electric furnace, heated and held to temper the hardened layer. By this heat treatment, the surface hardness of the tempered hardened layer on the inner surface of the mouth portion is the hardness required from the viewpoint of rolling life in a constant velocity universal joint with high speed and high load, Rockwell C hardness H RC 60 to.
It could be easily adjusted to the range of 64. Further, tempering is performed by continuous operation in a continuous furnace, and the outer ring is integrally heated by the atmosphere in the furnace, so the tempering temperature control is easy and the productivity and economy are excellent.
【0004】[0004]
【発明が解決しようとする課題】近年に至り、特に自動
車用の等速自在継手においては、自動車の燃費向上のた
め小型軽量化が追求され、また、エンジンの高性能に伴
って継手の外輪に作用する負荷トルクが一層高くなり、
これに耐える外輪を必要としている。In recent years, particularly in the case of constant velocity universal joints for automobiles, miniaturization and weight reduction have been pursued in order to improve the fuel efficiency of automobiles, and the outer ring of the joint has been improved in accordance with the high performance of the engine. The applied load torque becomes higher,
We need an outer ring that can withstand this.
【0005】上記従来の外輪ではマウス部の転走溝とス
テム部のセレーション軸との間に回転トルクを与える
と、ステム部の応力集中部で捩り破壊を生ずるが、その
破壊負荷トルクは上記要請を考慮すればなお低く、ステ
ム部を強靱化すべき必要がある。これに対処するに、上
記従来の炉内加熱によりマウス部の転走溝とステム部の
外周面とを同一条件で焼戻す方法では限界があった。In the conventional outer ring described above, when a rotational torque is applied between the rolling groove of the mouth portion and the serration shaft of the stem portion, torsional fracture occurs at the stress concentration portion of the stem portion. Considering the above, it is still low, and it is necessary to strengthen the stem portion. In order to deal with this, there is a limit in the conventional method of tempering the rolling groove of the mouth part and the outer peripheral surface of the stem part by the same heating in the furnace under the same conditions.
【0006】本発明は、上記問題に鑑み、ステム部を強
靱化して捩り強度を向上させるための自在継手外輪の熱
処理方法を提供しようとするものである。In view of the above problems, the present invention aims to provide a heat treatment method for a universal joint outer ring for strengthening the stem portion to improve the torsional strength.
【0007】[0007]
【課題を解決するための手段】本発明の等速自在継手外
輪の熱処理法は、転動体が転走する転走溝を内面に有す
るマウス部とセレーション等の歯型部を外周面に有する
ステム部とから一体に成形されて成る等速自在継手外輪
において、当該マウス部内面と当該ステム部外周面とに
それぞれ誘導加熱焼入れによる焼入れ硬化層を形成し、
次いで当該外輪を加熱炉中に加熱保持して焼戻しを行っ
た後、当該ステム部外周面のみを誘導加熱による二次焼
戻しを行って、当該ステム部外周面の少なくとも歯型部
のマウス部側端部近傍における硬化層の硬度を当該転走
溝の硬化層の硬度より低くするようにしたことを特徴と
するものである。A heat treatment method for an outer ring of a constant velocity universal joint according to the present invention is a stem having a mouth portion having a rolling groove for rolling a rolling element on an inner surface and a toothed portion such as serration on an outer peripheral surface. In the constant velocity universal joint outer ring integrally formed from the part, the quenching hardened layer by induction heating quenching is formed on the inner surface of the mouth part and the outer peripheral surface of the stem part, respectively.
Then, after the outer ring is heated and held in a heating furnace to be tempered, only the outer peripheral surface of the stem is subjected to secondary tempering by induction heating, and at least the end of the outer peripheral surface of the stem on the mouth side of the tooth part. The hardness of the hardened layer near the portion is lower than the hardness of the hardened layer of the rolling groove.
【0008】また、本発明の熱処理法には、上記外輪の
当該マウス部内面と当該ステム部外周面とに、それぞれ
個別に誘導加熱焼入れによる焼入れ硬化層を形成し、次
いで当該マウス部内面と当該ステム部外周面とをそれぞ
れ個別に誘導加熱により焼戻しを行って、当該ステム部
外周面の少なくとも歯型部のマウス側端部近傍における
硬化層の硬度を当該転走溝の硬化層の硬度よりも低くす
るようにした熱処理法を特徴とするものである。Further, in the heat treatment method of the present invention, a quench-hardened layer is formed individually on the inner surface of the mouse portion of the outer ring and the outer peripheral surface of the stem portion by induction heating and quenching, and then the inner surface of the mouse portion and the outer surface of the mouse portion are formed. The stem outer peripheral surface and the tempering are individually performed by induction heating, and the hardness of the hardened layer at least in the vicinity of the mouse side end portion of the tooth profile of the stem outer peripheral surface is higher than the hardness of the hardened layer of the rolling groove. It is characterized by a heat treatment method for lowering it.
【0009】本発明の熱処理法が適用される外輪の鋼種
は、一般の高周波焼入れ鋼や浸炭焼入れ鋼などの構造用
鋼であればよく、また本熱処理法により、当該ステム部
外周面の少なくとも歯型部のマウス側端部近傍における
硬化層の硬度がロックウェルC硬度HRC55〜60の範
囲にあるように調整されるものが特に好ましい。The steel type of the outer ring to which the heat treatment method of the present invention is applied may be any structural steel such as general induction hardened steel or carburized and hardened steel. It is particularly preferable that the hardness of the hardened layer in the vicinity of the mouse side end of the mold part is adjusted so as to be in the range of Rockwell C hardness H RC 55 to 60.
【0010】[0010]
【作用】マウス部とステム部とから一体に形成されて成
る外輪において、マウス部内面とステム部外周面は別個
に誘導加熱による焼入れをするので、それぞれマルテン
サイト相の焼入れ硬化層が形成され、次いで外輪自体を
加熱炉中に装入して低温焼戻し処理を行なうので、当該
硬化層は、焼戻しマルテンサイト相となり、変態残留応
力の一部を解除して、靱性が回復する。この誘導加熱焼
入れ・炉内焼戻しの条件は、従来法と同様でよく、専
ら、転走溝の硬化層の表面硬度を転動寿命に必要なHRC
60〜64の硬度にすべく定められ、従ってステム部外
周面の硬度もHRC60〜64程度となる。[Function] In the outer ring integrally formed of the mouse portion and the stem portion, the inner surface of the mouse portion and the outer peripheral surface of the stem portion are separately quenched by induction heating, so that a quench-hardened layer of martensite phase is formed, Next, since the outer ring itself is charged into a heating furnace and subjected to a low temperature tempering treatment, the hardened layer becomes a tempered martensite phase, part of the transformation residual stress is released, and the toughness is restored. Conditions of the induction hardening and furnace tempering may be the same as the conventional method, exclusively, the required surface hardness of the rolling groove hardened layer of the rolling life H RC
The hardness is determined to be 60 to 64, and therefore the hardness of the outer peripheral surface of the stem portion is also about H RC 60 to 64.
【0011】上記炉内焼戻し後に、ステム部外周面のみ
を誘導加熱による二次焼戻しを行い、この誘導加熱の際
の外周面温度を上記炉内焼戻しの加熱温度より高くする
ことにより、当該外周面の硬化層は僅かに軟化して伸
び、衝撃値が高くなり、靱性が向上する。After the in-furnace tempering, only the outer peripheral surface of the stem portion is subjected to secondary tempering by induction heating, and the outer peripheral surface temperature at the time of this induction heating is made higher than the heating temperature of the in-furnace inner peripheral surface. The hardened layer is slightly softened and stretched, the impact value is increased, and the toughness is improved.
【0012】ステム部に回転トルクを付与して破壊させ
た場合、ステム部外周面に刻設されたセレーションなど
の歯型部のマウス側端部で破壊する。これは、捩り応力
が集中するセレーション端部の硬化層で亀裂が発生し、
ステム部内質部に主応力型の破壊が伝播進行して、ステ
ム部が破断するのである。When the stem portion is broken by applying a rotating torque, the stem portion is broken at the mouse side end portion of the toothed portion such as serration formed on the outer peripheral surface of the stem portion. This is because cracks occur in the hardened layer at the serration end where the torsional stress concentrates,
The main stress type fracture propagates to the inner portion of the stem portion and the stem portion is broken.
【0013】本発明の熱処理法においては、少なくとも
当該歯型部のマウス部側端部近傍における硬化層を僅か
に軟化させて靱性を高めるので、割れに対する感受性が
低くなり、上記破壊開始部位の捩り強度を高めることに
なり、従って破壊トルクを高める。In the heat treatment method of the present invention, since at least the hardened layer at least in the vicinity of the mouth side of the tooth pattern portion is softened to enhance the toughness, the susceptibility to cracking is lowered and the torsion at the fracture initiation site is twisted. It will increase the strength and therefore the breaking torque.
【0014】ステム部外周面の硬化層の表面硬度は、当
該歯型部のマウス側端部近傍で、HRC55〜60に調整
するが、その表面硬度をHRC55より低くすると、当該
硬化層の残留圧縮応力も低減して、繰り返し応力に対す
る疲労強度が低下するので妥当ではない。[0014] The surface hardness of the hardened layer of the stem portion outer peripheral surface is a mouth-side end portion of the tooth-shaped portion, when it is adjusted to H RC 55 to 60, to the surface hardness lower than H RC 55, the curing It is not appropriate because the residual compressive stress of the layer is also reduced and the fatigue strength against repeated stress is reduced.
【0015】ステム部の当該硬化層の表面硬度を上記H
RC55〜60の範囲に調整するには、炉内加熱焼戻しの
加熱温度を180℃(60分)とした場合に、二次焼戻
し温度は180〜220℃で10〜20秒程度の加熱時
間とする。The surface hardness of the hardened layer of the stem portion is calculated as H above.
To adjust to the range of RC 55 to 60, when the heating temperature of the heating and tempering in the furnace is 180 ° C. (60 minutes), the secondary tempering temperature is 180 to 220 ° C. and the heating time is about 10 to 20 seconds. To do.
【0016】本発明の外輪の熱処理法が、炉内加熱焼戻
しを省略して、マウス部内面の焼入れ硬化層とステム部
外周面の焼入れ硬化層とを、それぞれ別個の誘導コイル
により誘導加熱して焼戻す方法である場合には、ステム
部外周面の焼戻し硬化層の硬度をマウス部内面の焼戻し
硬化層の硬度より低くすることは容易になし得る。In the heat treatment method for the outer ring of the present invention, the quenching and hardening in the furnace are omitted, and the quenching and hardening layer on the inner surface of the mouth and the hardening and hardening layer on the outer circumference of the stem are induction-heated by separate induction coils. In the case of a tempering method, the hardness of the tempered hardened layer on the outer peripheral surface of the stem portion can be easily made lower than the hardness of the tempered hardened layer on the inner surface of the mouse portion.
【0017】上記二次焼戻しや炉内加熱を省略した直接
の焼戻しのための誘導加熱法は、高周波加熱でも低周波
加熱でもよい。周波数を低くすれば、鋼材表面の誘導表
皮電流層は厚くなり、表層部の一様の加熱のためには好
都合である。更に、低周波になるほど、コイルと鋼材表
面との間隙を大きくしても、表層部には充分に電流を誘
導することができるので、長手方向に外径の異なる周面
を有するような本発明の外輪ステム部の加熱には、好都
合であり、コイル内にステム部を挿入固定する芯出し調
整も、少々の扁芯は許容されるから極めて容易になる。
低周波加熱は、上記のステム部の焼戻しにも利用される
が、マウス部内面の焼入れ硬化層の焼戻しには、マウス
部内面に低周波コイルを挿入固定して、焼入れ硬化層を
誘導加熱する方法が利用でき、また、マウス部の外周部
をコイル中空部に挿入固定した低周波コイルにより、マ
ウス部の外周面から内面に到る肉厚方向に加熱して焼入
れ硬化層を焼き戻す方法も採用できる。焼戻しにおい
て、高周波加熱では、周波数は1〜10KHZ 、低周波
加熱の場合は、周波数50〜500HZ とされるが、、
その中間の中周波加熱も利用可能である。The induction heating method for direct tempering without the secondary tempering or heating in the furnace may be high frequency heating or low frequency heating. If the frequency is lowered, the induction skin current layer on the steel surface becomes thicker, which is convenient for uniform heating of the surface layer portion. Further, as the frequency becomes lower, even if the gap between the coil and the surface of the steel material is increased, a sufficient current can be induced in the surface layer portion, so that the present invention has a circumferential surface having different outer diameters in the longitudinal direction. It is convenient to heat the outer ring stem part, and the centering adjustment for inserting and fixing the stem part in the coil is extremely easy because a small flat core is allowed.
The low-frequency heating is also used for tempering the stem part described above, but for tempering the quench-hardened layer on the inner surface of the mouse part, a low-frequency coil is inserted and fixed on the inner surface of the mouse part to induction-heat the quench-hardened layer. A method can be used, and a low frequency coil in which the outer peripheral portion of the mouse portion is inserted and fixed in the hollow portion of the coil is used to heat the quench-hardened layer by heating in the thickness direction from the outer peripheral surface of the mouse portion to the inner surface. Can be adopted. In tempering, the high-frequency heating, frequency 1~10KH Z, in the case of low-frequency heating, but is the frequency 50~500H Z ,,
Intermediate medium frequency heating is also available.
【0018】[0018]
【実施例】供試材は図1に示す固定型ボールジョイント
と、図2に示すプランジング型ジョイントの外輪であっ
て、高周波焼入れ鋼を型鍛造により一体成形した。両方
式の外輪は、ステム部1とマウス部2とから一体に構成
され、マウス部内面22には、数条の転走溝23が成形
され、またマウス部2の背部から突設されたステム部1
には、先側に向けて、軸受支持部14とセレーション部
15とネジ部16又は止め輪溝17とが設けられてい
る。セレーション部15は転造により台形状セレーショ
ンが刻設されており、図1では、その大径は24mmで
あり、歯高は2mmである。図1(A)と図2には、ス
テム部1外周面の表面硬化層11とマウス部2内面の表
面硬化層21が模式的に示してある。EXAMPLES The test materials were outer rings of the fixed type ball joint shown in FIG. 1 and the plunging type joint shown in FIG. 2. Induction hardened steel was integrally formed by die forging. The outer ring of both methods is integrally formed of a stem portion 1 and a mouse portion 2, a plurality of rolling grooves 23 are formed on an inner surface 22 of the mouse portion, and a stem protruding from the back portion of the mouse portion 2 is formed. Part 1
The bearing support portion 14, the serration portion 15, the screw portion 16 or the retaining ring groove 17 are provided on the front side of the. The serration portion 15 has a trapezoidal serration formed by rolling, and in FIG. 1, the large diameter is 24 mm and the tooth height is 2 mm. In FIG. 1 (A) and FIG. 2, the surface hardened layer 11 on the outer peripheral surface of the stem portion 1 and the surface hardened layer 21 on the inner surface of the mouse portion 2 are schematically shown.
【0019】(実施例1)熱処理法として、高周波焼入
れと炉内焼戻し後のステム部の二次焼戻しを行う工程を
以下に述べる。(Example 1) As a heat treatment method, the steps of induction hardening and secondary tempering of a stem portion after tempering in a furnace will be described below.
【0020】図3(A)に示すように、当該外輪のステ
ム部1の外周面を高周波コイル41内に挿入固定して、
周波数10KHzの誘導電力により、外周面を950℃
に加熱して4〜5秒保持した後、直ちに注水して、表面
焼入れを行った。また、マウス部2内面に、別の高周波
コイル42を挿入して、同様に誘導加熱と注水を行い、
表面焼入れを行った。As shown in FIG. 3 (A), the outer peripheral surface of the stem portion 1 of the outer ring is inserted and fixed in the high frequency coil 41,
950 ° C on the outer peripheral surface due to induction power with a frequency of 10 KHz
After heating for 4 to 5 seconds and then immediately pouring water, the surface was quenched. Further, another high-frequency coil 42 is inserted on the inner surface of the mouse portion 2, and induction heating and water injection are similarly performed,
The surface was quenched.
【0021】次に、図3(B)に示すように、連続式電
気炉6に、上記高周波焼入れした外輪3を装入して、電
気ヒーター61で加熱しながら、コンベア62により炉
内を搬送して、180℃で60分の加熱保持してのち、
放冷して、焼戻しを行った。Next, as shown in FIG. 3 (B), the induction-hardened outer ring 3 is placed in a continuous electric furnace 6 and heated by an electric heater 61 while being conveyed by a conveyor 62. Then, after heating and holding at 180 ° C for 60 minutes,
It stood to cool and tempered.
【0022】以上の高周波焼入れと炉内焼戻しは実操業
での条件とほぼ同じで、この炉内焼戻し後の外輪を比較
例として、外輪のマウス部内面の転走溝23とステム部
1外周面のセレーション15切下げ部の歯底151(図
1(B))との位置で、マイクロヴィッカース硬度試験
機により硬化層11,21の表面硬度の測定を行った。The above induction hardening and tempering in the furnace are almost the same as the conditions in actual operation. The outer ring after tempering in the furnace is used as a comparative example, and the rolling groove 23 on the inner surface of the mouth portion of the outer ring and the outer peripheral surface of the stem portion 1 are taken as a comparative example. The surface hardness of the hardened layers 11 and 21 was measured by the micro Vickers hardness tester at the position of the tooth bottom 151 (FIG. 1B) of the serration 15 lowering part.
【0023】固定型ボールジョイントにつき、マウス部
転走溝の底面23では平均のヴィッカース硬度HV 71
5.2 (換算HRC60.8)であるのに対してステム
部のセレーション端部の歯底151ではHV 732.8
(換算HRC61.5)であり、またプランジング型に
おいて、転走溝の底面23でHV 721.2 (換算H
RC61.0)であるのに対してセレーション端部の歯底
151では平均HV742.0 (換算HRC61.8)
であり(いずれも試料数25)、セレーション端部の歯
底151の方が硬度は高くなっていた。The average Vickers hardness H V 71 on the bottom surface 23 of the rolling groove of the mouth of the fixed ball joint
5.2 (converted to H RC 60.8), while H V 732.8 at the tooth bottom 151 at the serration end of the stem.
(Converted H RC 61.5), and in the plunging type, H V 721.2 (converted H RC 61.5) at the bottom surface 23 of the rolling groove.
RC 61.0), while the root 151 at the serration end has an average H V 742.0 (converted H RC 61.8).
(In each case, the number of samples was 25), and the hardness of the tooth bottom 151 at the serration end was higher.
【0024】次に、炉内焼戻し後の上記外輪のステム部
1を、図3(C)に示すように、低周波コイル43に挿
入して、セレーション部15と軸受支持部14との間を
中心として、周波数180Hzで誘導加熱を行い、二次
焼戻しを行った。この際、ステム部の外周面の温度を1
60℃で12秒と、220℃で15秒保持の2水準の加
熱条件に調整した。Next, as shown in FIG. 3 (C), the stem portion 1 of the outer ring after tempering in the furnace is inserted into the low frequency coil 43, and the space between the serration portion 15 and the bearing support portion 14 is inserted. As a center, induction heating was performed at a frequency of 180 Hz to perform secondary tempering. At this time, set the temperature of the outer peripheral surface of the stem to 1
The heating conditions were adjusted to two levels of 60 ° C. for 12 seconds and 220 ° C. for 15 seconds.
【0025】二次焼戻し後の供試材につき、上記比較例
と同様の硬度測定を行った。また上記比較材と供試材に
つき、静的捩り試験機によりステム部が破壊するまでの
破壊トルクを測定した。破断は、図2のセレーション部
15の切下げ部歯底151から発生して、軸受支持部1
4を斜断していたが、破断の形態には、実施例と比較例
では特段の差異は認められなかった。試験結果をまとめ
て図4に示した。The hardness of the test material after the secondary tempering was measured in the same manner as in the comparative example. Further, with respect to the comparative material and the test material, a breaking torque until the stem portion was broken was measured by a static torsion tester. The breakage occurs from the bottom tooth bottom 151 of the serrated portion 15 of FIG.
No. 4 was obliquely cut, but no particular difference was observed in the rupture form between the example and the comparative example. The test results are shown together in FIG.
【0026】二次焼戻しの条件220℃×15sec加
熱によりステム部のセレーション切下げ部歯底の表面硬
度がHRC55.8程に軟化し、このときが図4に示すよ
うに、最も破壊トルクは高くなり、本発明の熱処理法
が、ステム部の強靱化に有効であることがわかる。The surface hardness of the serration lowered portion tooth bottom of the stem portion is softened extent H RC 55.8 by condition 220 ° C. × 15 sec heating of the secondary tempering, as shown at this time is 4, and most damaging torque is It becomes higher, and it can be seen that the heat treatment method of the present invention is effective for strengthening the toughness of the stem portion.
【0027】(実施例2)次に、炉内焼戻しを省略し
て、高周波焼入れした外輪を、低周波加熱による焼戻し
を行う実施例を示す。(Embodiment 2) Next, an embodiment will be described in which the tempering in the furnace is omitted and the induction-hardened outer ring is tempered by low-frequency heating.
【0028】図5は、実施例1で述べた高周波焼入れに
よって、焼入れ硬化層を形成した外輪の低周波焼戻しの
概要図であるが、ステム部1は、低周波コイル45の中
空部に挿入され、また、マウス部2は別の低周波コイル
46の中空部に挿入される。誘導電流を180Hzの低
周波としているので、マウス部内面の焼入れ硬化層は、
マウス部外周面からの低周波誘導加熱によって十分に均
一に加熱することができた。FIG. 5 is a schematic diagram of the low frequency tempering of the outer ring having the quench hardened layer formed by the induction hardening described in Example 1. The stem portion 1 is inserted into the hollow portion of the low frequency coil 45. The mouse portion 2 is inserted into the hollow portion of another low frequency coil 46. Since the induction current is a low frequency of 180 Hz, the quench hardening layer on the inner surface of the mouse is
Sufficiently uniform heating could be achieved by low frequency induction heating from the outer peripheral surface of the mouse.
【0029】ステム部外周面の焼戻し温度220℃で1
5秒加熱してセレーション部の平均硬度HRC55〜56
を得た。また、マウス部内面の焼戻し温度は155℃で
12秒加熱して、転走溝底面においてHRC60の硬度を
得た。When the tempering temperature of the outer peripheral surface of the stem portion is 220 ° C., 1
After heating for 5 seconds, the average hardness of the serration part H RC 55-56
Got Further, the tempering temperature of the inner surface of the mouse portion was heated to 155 ° C. for 12 seconds to obtain the hardness of H RC 60 on the bottom surface of the rolling groove.
【0030】低周波焼戻しを行った固定型ボールジョイ
ントについて静的捩り試験を実施して、実施例1と同様
にステム部の硬化層の表面硬度を低下させることによ
り、破壊トルクが高くなることを確認した。A static torsion test was carried out on the fixed type ball joint which had been subjected to low frequency tempering, and the breaking torque was increased by lowering the surface hardness of the hardened layer of the stem portion as in Example 1. confirmed.
【0031】[0031]
【発明の効果】本発明の外輪の熱処理法を実施すれば、
次のような効果を奏することができる。外輪を高周波焼
入れ・炉内焼戻し後にステム部外周面の硬化層のみ誘導
加熱による二次焼戻しを行うから、マウス部の内面の硬
化層の硬度は専ら転動寿命の点より調整して、かつステ
ム部外周面の硬化層の硬度は捩り破壊に対応して強靱化
の観点より調整することが容易になり、二次焼戻しによ
りステム部硬化層を僅かに軟化させることにより、当該
硬化層表面の割れ感受性を鈍化して、破壊トルクを高め
ることができる。またステム部外周面とマウス部内面と
をそれぞれ別個の誘導コイルによる誘導加熱を行えば、
さらに炉内焼戻しを省略することができ、マウス部内面
の硬度とステム部外周面の硬度を別個独立に調整するこ
とが可能となる。By carrying out the heat treatment method for the outer ring of the present invention,
The following effects can be achieved. After induction hardening of the outer ring and tempering in the furnace, only the hardened layer on the outer peripheral surface of the stem is subjected to secondary tempering by induction heating.Therefore, the hardness of the hardened layer on the inner surface of the mouse is adjusted exclusively from the viewpoint of rolling life, and The hardness of the hardened layer on the outer peripheral surface of the part can be easily adjusted from the viewpoint of toughness in response to torsional fracture, and by slightly softening the hardened stem part by secondary tempering, cracking of the hardened layer surface Sensitivity can be slowed down and breaking torque can be increased. Also, if induction heating is performed on the outer peripheral surface of the stem portion and the inner surface of the mouse portion by separate induction coils,
Further, tempering in the furnace can be omitted, and the hardness of the inner surface of the mouth portion and the hardness of the outer peripheral surface of the stem portion can be adjusted independently.
【0031】特に誘導加熱焼戻しに低周波電流を利用す
れば、外輪表面部への低周波電流の浸透深さが大きいか
ら、コイルと外輪表面との間隔を大きくしても硬化層の
均一加熱が容易であるので、マウス部内面の硬化層の焼
戻しに対しても、マウス部の外周面に低周波コイルを外
装すれば足り、芯出しの精度も厳密さを要求されないの
で作業性、生産性が高くなり、生産コストの低減に有効
である。In particular, when a low frequency current is used for induction heating and tempering, the penetration depth of the low frequency current into the outer ring surface portion is large, so that even if the distance between the coil and the outer ring surface is increased, the hardened layer is uniformly heated. Since it is easy, even for tempering of the hardened layer on the inner surface of the mouse part, it is sufficient to cover the outer peripheral surface of the mouse part with a low-frequency coil, and strict accuracy of centering is not required, so workability and productivity are improved. It is expensive and effective in reducing production costs.
【図1】固定型ボールジョイントの外観・断面図(A)
とステム部のセレーション端部近傍の部分断面(B)。FIG. 1 Appearance and cross-sectional view of a fixed ball joint (A)
And a partial cross section near the serration end of the stem (B).
【図2】プランジング型ジョイントの断面図。FIG. 2 is a sectional view of a plunging type joint.
【図3】固定型ボールジョイントの実施例における熱処
理工程の加熱要領図。FIG. 3 is a heating procedure diagram of a heat treatment process in an embodiment of a fixed ball joint.
【図4】実施例と比較例におけるステム部表面硬度と破
壊トルクの関係を示す図。FIG. 4 is a diagram showing a relationship between a stem surface hardness and a breaking torque in Examples and Comparative Examples.
【図5】外輪を誘導加熱による焼戻しにおける低周波コ
イルの配置関係を示す図。FIG. 5 is a diagram showing an arrangement relationship of low-frequency coils in tempering the outer ring by induction heating.
1 ステム部 11 硬化層 14 軸受支持部 15 セレーション部 2 マウス部 23 転走溝 3 外輪 41 高周波コイル 43 低周波コイル 1 Stem part 11 Hardened layer 14 Bearing support 15 Serration part 2 mouse part 23 Rolling groove 3 outer ring 41 high frequency coil 43 low frequency coil
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成3年8月15日[Submission date] August 15, 1991
【手続補正2】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】0024[Name of item to be corrected] 0024
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【0024】 次に、炉内焼戻し後の上記外輪のステム
部1を、図3(C)に示すように、低周波コイル43に
挿入して、セレーション部15と軸受支持部14との間
を中心として、周波数180Hzで誘導加熱を行い、二
次焼戻しを行った。この際、ステム部の外周面の温度を
220℃で15秒保持の加熱条件に調整した。Next, as shown in FIG. 3C, the stem portion 1 of the outer ring after tempering in the furnace is inserted into the low frequency coil 43, and the space between the serration portion 15 and the bearing support portion 14 is inserted. As a center, induction heating was performed at a frequency of 180 Hz to perform secondary tempering. At this time, the temperature of the outer peripheral surface of the stem portion
And adjusted to the heating conditions of 15 Byoho lifting at 22 0 ° C..
【手続補正3】[Procedure 3]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】全図[Correction target item name] All drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図2】 [Fig. 2]
【図1】 [Figure 1]
【図3】 [Figure 3]
【図4】 [Figure 4]
【図5】 [Figure 5]
Claims (3)
マウス部とセレーション等の歯型部を外周面に有するス
テム部とから一体に成形されて成る等速自在継手外輪の
当該マウス部内面と当該ステム部外周面とに、それぞれ
誘導加熱焼入れによる焼入れ硬化層を形成し、次いで当
該外輪を加熱炉中に加熱保持して焼戻しを行った後、当
該ステム部外周面のみを誘導加熱による二次焼戻しを行
って、当該ステム部外周面の少なくとも歯型部のマウス
部側端部近傍における硬化層の硬度を当該転走溝の硬化
層の硬度より低くするようにした等速自在継手外輪の熱
処理方法。1. A mouse of a constant velocity universal joint outer ring formed integrally from a mouth part having a rolling groove on which an rolling element rolls and an stem part having a tooth profile part such as serration on an outer peripheral surface. After forming a quench-hardened layer by induction heating and quenching on the inner surface of the part and the outer peripheral surface of the stem, respectively, the outer ring is heated and held in a heating furnace for tempering, and then only the outer peripheral surface of the stem is induction heated. By performing secondary tempering with a constant velocity universal joint so that the hardness of the hardened layer at least in the vicinity of the mouth side end of the tooth profile on the outer peripheral surface of the stem is lower than the hardness of the hardened layer of the rolling groove. Heat treatment method for outer ring.
マウス部とセレーション等の歯型部を外周面に有するス
テム部とから一体に成形されて成る等速自在継手外輪の
当該マウス部内面と当該ステム部外周面とに、それぞれ
個別に誘導加熱焼入れによる焼入れ硬化層を形成し、次
いで当該マウス部内面と当該ステム部外周面とをそれぞ
れ個別に誘導加熱により焼戻しを行って、当該ステム部
外周面の少なくとも歯型部のマウス側端部近傍における
硬化層の硬度を当該転走溝の硬化層の硬度よりも低くす
るようにした等速自在継手外輪の熱処理方法。2. A mouse having a constant velocity universal joint outer ring integrally formed from a mouth portion having a rolling groove on which an rolling element rolls on an inner surface and a stem portion having a toothed portion such as serration on an outer peripheral surface. On the inner surface of the portion and the outer peripheral surface of the stem portion, a quenching hardened layer is formed by induction heating and quenching individually, and then the inner surface of the mouse portion and the outer peripheral surface of the stem portion are individually tempered by induction heating, A heat treatment method for a constant velocity universal joint outer ring, wherein the hardness of the hardened layer on the outer peripheral surface of the stem portion at least in the vicinity of the mouse side end portion of the tooth profile is lower than the hardness of the hardened layer of the rolling groove.
のマウス側端部近傍における硬化層の硬度がロックウェ
ルC硬度HRC55〜60の範囲にある請求項1又は2記
載の等速自在継手外輪の熱処理方法。3. The uniform velocity control according to claim 1, wherein the hardness of the hardened layer on the outer peripheral surface of the stem portion at least in the vicinity of the mouse side end portion of the toothed portion is in the range of Rockwell C hardness H RC 55 to 60. Heat treatment method for outer ring of joint.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3185497A JPH059584A (en) | 1991-06-28 | 1991-06-28 | Heat treatment of outer ring of uniform-speed universal joint |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3185497A JPH059584A (en) | 1991-06-28 | 1991-06-28 | Heat treatment of outer ring of uniform-speed universal joint |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH059584A true JPH059584A (en) | 1993-01-19 |
Family
ID=16171805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3185497A Pending JPH059584A (en) | 1991-06-28 | 1991-06-28 | Heat treatment of outer ring of uniform-speed universal joint |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH059584A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1293210C (en) * | 2002-11-20 | 2007-01-03 | 富士电子工业株式会社 | High frequency quenching device for uniform speed universal joint |
JP2007254838A (en) * | 2006-03-24 | 2007-10-04 | Ntn Corp | Induction heating method by inner and outer coils for tempering outer ring of uniform-speed joint, inner and outer coils for tempering and tempering apparatus |
JP2007262461A (en) * | 2006-03-28 | 2007-10-11 | Ntn Corp | Method and apparatus for induction-heating using stepwise heating |
US7438477B2 (en) | 2001-11-29 | 2008-10-21 | Ntn Corporation | Bearing part, heat treatment method thereof, and rolling bearing |
JP2009007595A (en) * | 2007-06-26 | 2009-01-15 | High Frequency Heattreat Co Ltd | Tempering apparatus and tempering method |
US7490583B2 (en) | 2002-10-17 | 2009-02-17 | Ntn Corporation | Full-type rolling bearing and roller cam follower for engine |
US7594762B2 (en) | 2004-01-09 | 2009-09-29 | Ntn Corporation | Thrust needle roller bearing, support structure receiving thrust load of compressor for car air-conditioner, support structure receiving thrust load of automatic transmission, support structure for continuously variable transmission, and support structure receivin |
JP2010031305A (en) * | 2008-07-25 | 2010-02-12 | Ntn Corp | Tempering apparatus and method using high-frequency induction heating |
US7682087B2 (en) | 2003-02-28 | 2010-03-23 | Ntn Corporation | Transmission component, method of manufacturing the same, and tapered roller bearing |
US7744283B2 (en) | 2003-03-14 | 2010-06-29 | Ntn Corporation | Bearing for alternator and bearing for pulley |
US8002907B2 (en) | 2003-08-29 | 2011-08-23 | Ntn Corporation | Bearing's component, heat treatment method thereof, heat treatment apparatus, and rolling bearing |
CN103615471A (en) * | 2013-10-21 | 2014-03-05 | 宁波纬尚汽车零部件有限公司 | Improved structure of inner constant velocity joint assembly |
CN114908225A (en) * | 2022-06-09 | 2022-08-16 | 宁波万航实业有限公司 | Constant velocity universal joint heat treatment process for dune buggy |
-
1991
- 1991-06-28 JP JP3185497A patent/JPH059584A/en active Pending
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8425690B2 (en) | 2001-11-29 | 2013-04-23 | Ntn Corporation | Bearing part, heat treatment method thereof, and rolling bearing |
US7438477B2 (en) | 2001-11-29 | 2008-10-21 | Ntn Corporation | Bearing part, heat treatment method thereof, and rolling bearing |
US7490583B2 (en) | 2002-10-17 | 2009-02-17 | Ntn Corporation | Full-type rolling bearing and roller cam follower for engine |
CN1293210C (en) * | 2002-11-20 | 2007-01-03 | 富士电子工业株式会社 | High frequency quenching device for uniform speed universal joint |
US7682087B2 (en) | 2003-02-28 | 2010-03-23 | Ntn Corporation | Transmission component, method of manufacturing the same, and tapered roller bearing |
US7744283B2 (en) | 2003-03-14 | 2010-06-29 | Ntn Corporation | Bearing for alternator and bearing for pulley |
US8333516B2 (en) | 2003-03-14 | 2012-12-18 | Ntn Corporation | Bearing for alternator and bearing for pulley |
US8002907B2 (en) | 2003-08-29 | 2011-08-23 | Ntn Corporation | Bearing's component, heat treatment method thereof, heat treatment apparatus, and rolling bearing |
US7594762B2 (en) | 2004-01-09 | 2009-09-29 | Ntn Corporation | Thrust needle roller bearing, support structure receiving thrust load of compressor for car air-conditioner, support structure receiving thrust load of automatic transmission, support structure for continuously variable transmission, and support structure receivin |
JP2007254838A (en) * | 2006-03-24 | 2007-10-04 | Ntn Corp | Induction heating method by inner and outer coils for tempering outer ring of uniform-speed joint, inner and outer coils for tempering and tempering apparatus |
JP2007262461A (en) * | 2006-03-28 | 2007-10-11 | Ntn Corp | Method and apparatus for induction-heating using stepwise heating |
JP2009007595A (en) * | 2007-06-26 | 2009-01-15 | High Frequency Heattreat Co Ltd | Tempering apparatus and tempering method |
JP2010031305A (en) * | 2008-07-25 | 2010-02-12 | Ntn Corp | Tempering apparatus and method using high-frequency induction heating |
CN103615471A (en) * | 2013-10-21 | 2014-03-05 | 宁波纬尚汽车零部件有限公司 | Improved structure of inner constant velocity joint assembly |
CN114908225A (en) * | 2022-06-09 | 2022-08-16 | 宁波万航实业有限公司 | Constant velocity universal joint heat treatment process for dune buggy |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5611828B2 (en) | Rotating elements or rotating rings formed from bearing steel | |
EP0092815B1 (en) | A car stabilizer and a manufacturing method therefor | |
JPH059584A (en) | Heat treatment of outer ring of uniform-speed universal joint | |
JP5535922B2 (en) | Heat treatment process for steel | |
US4885831A (en) | Method for forming a contour hardened gear | |
US20050236794A1 (en) | Suspension component having localized material strengthening | |
EP0700739B1 (en) | Method for producing a vehicular endless track link | |
US7416621B2 (en) | Laser rounding and flattening of cylindrical parts | |
CN107475501A (en) | A kind of Micro Alloying brake camshaft and its manufacture method | |
CN107470852A (en) | A kind of Micro Alloying semiaxis and its manufacture method | |
JPH059583A (en) | Outer ring of uniform-speed universal joint reinforced in stem part | |
KR20090046896A (en) | Frictionally press-bonded member | |
KR100317712B1 (en) | Carburizing heat treatment method and carburizing heat transfer member | |
US20050039830A1 (en) | Induction heat treatment method and coil and article treated thereby | |
JPS60162726A (en) | Method for surface-hardening toothed part of ring gear of flywheel | |
US8114224B2 (en) | Process for the production of an articulated structural part having improved wear resistance | |
US20050039829A1 (en) | Induction heat treatment method and article treated thereby | |
JPH10267027A (en) | Tube shaft and manufacture thereof | |
JP2006002809A (en) | Hollow power transmission shaft | |
JPH0526250A (en) | Outer ring of constant velocity universal coupling | |
JPS5977979A (en) | Bushing for track shoe and production thereof | |
JPH11279647A (en) | Method for tempering cylindrical work | |
JPS63230824A (en) | Heat treatment for sleeve roll | |
JPS60168910A (en) | Shotpeened drive shaft | |
JPH11131143A (en) | Heat treatment of crawler bush |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071107 Year of fee payment: 4 |
|
FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 5 Free format text: PAYMENT UNTIL: 20081107 |
|
FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 5 Free format text: PAYMENT UNTIL: 20081107 |
|
FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 6 Free format text: PAYMENT UNTIL: 20091107 |
|
FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091107 Year of fee payment: 6 |
|
FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 7 Free format text: PAYMENT UNTIL: 20101107 |
|
FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 8 Free format text: PAYMENT UNTIL: 20111107 |
|
FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 9 Free format text: PAYMENT UNTIL: 20121107 |
|
FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121107 Year of fee payment: 9 |
|
FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 10 Free format text: PAYMENT UNTIL: 20131107 |