JP5015478B2 - Induction heating method with inner and outer coils for tempering constant velocity joint outer ring - Google Patents

Induction heating method with inner and outer coils for tempering constant velocity joint outer ring Download PDF

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JP5015478B2
JP5015478B2 JP2006081967A JP2006081967A JP5015478B2 JP 5015478 B2 JP5015478 B2 JP 5015478B2 JP 2006081967 A JP2006081967 A JP 2006081967A JP 2006081967 A JP2006081967 A JP 2006081967A JP 5015478 B2 JP5015478 B2 JP 5015478B2
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coil
tempering
induction heating
outer ring
constant velocity
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JP2007254838A (en
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慎太郎 鈴木
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NTN Corp
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    • 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
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Description

この発明は、等速ジョイント外輪における高周波誘導加熱を用いた焼戻し工程での製品内の温度差低減による硬度の均一化と、等速ジョイント外輪における異なる製品形状に対する焼戻しコイルの共通化を図る内外コイルによる誘導加熱方法とその内外コイル及び焼戻し装置に関するものである。   The present invention relates to an inner / outer coil that achieves uniform hardness by reducing a temperature difference in a product in a tempering process using high-frequency induction heating in a constant velocity joint outer ring, and a common tempering coil for different product shapes in a constant velocity joint outer ring. The present invention relates to an induction heating method, an inner / outer coil and a tempering device.

等速ジョイント外輪の熱処理では、高周波誘導加熱を用いた焼戻し法が用いられている。この等速ジョイント外輪の高周波誘導加熱を用いた焼戻しでは、図６（ａ）、（ｂ）に示すような丸型のソレノイドコイル１や図７（ａ）、（ｂ）に示すヘアピンコイル２の内部にワーク（外輪）３を置いて、前記コイル１、２に高周波電流を供給しワーク３を加熱する。このとき、必要に応じてワーク３を回転させて加熱する。図６や図７のどちらの方式ともワーク３の軸部４は前記コイル１，２から直接加熱されるが、カップ部５の内部は、外周からの熱伝導で温度が上昇する。なお、前記コイル１，２に供給する高周波電流の大きさ、及び周波数は製品により調整する。   In the heat treatment of the constant velocity joint outer ring, a tempering method using high frequency induction heating is used. In the tempering using high frequency induction heating of the constant velocity joint outer ring, the round solenoid coil 1 as shown in FIGS. 6A and 6B and the hairpin coil 2 shown in FIGS. 7A and 7B are used. A work (outer ring) 3 is placed inside, and a high-frequency current is supplied to the coils 1 and 2 to heat the work 3. At this time, the work 3 is rotated and heated as necessary. 6 and 7, the shaft portion 4 of the work 3 is directly heated from the coils 1 and 2, but the temperature inside the cup portion 5 rises due to heat conduction from the outer periphery. The magnitude and frequency of the high-frequency current supplied to the coils 1 and 2 are adjusted depending on the product.

このような誘導加熱によりワーク３が焼戻しに必要温度まで上昇したところで、高周波電流の供給を停止し、一定時間保持したのちワーク３を冷却水で冷却して焼戻しが完了する。   When the workpiece 3 has risen to a temperature required for tempering by such induction heating, the supply of the high-frequency current is stopped, and after holding for a certain time, the workpiece 3 is cooled with cooling water to complete the tempering.

ところで、上記のような方法の場合、等速ジョイントの外輪の軸部４では、硬化部が外径にあるのに対し、カップ部５では、硬化部は内径に存在する。軸部４とカップ部５では、形状、質量も異なることから、外側からの加熱で硬化部を同じ温度で焼戻すには、図８（ａ）に示すように、コイル１のターンの間隔や径Ｌ、あるいは図８（ｂ）のように、コイル２とワーク３の位置関係Ｌを調整しなければならない。しかし、コイルは銅で製作されているので、形状や位置関係を調整するのは容易でない問題がある。   By the way, in the case of the above methods, in the axial part 4 of the outer ring | wheel of a constant velocity joint, while the hardening part has an outer diameter, in the cup part 5, a hardening part exists in an internal diameter. Since the shape and mass of the shaft part 4 and the cup part 5 are different, in order to temper the hardened part at the same temperature by heating from the outside, as shown in FIG. The positional relationship L between the coil 2 and the work 3 must be adjusted as shown in the diameter L or FIG. 8B. However, since the coil is made of copper, there is a problem that it is not easy to adjust the shape and positional relationship.

また、等速ジョイントには、図３に示すように、３本のトラック溝１４と、トラック溝１４を構成する向かい合ったローラ案内面１５を結ぶ大内径部６と、各々のトラック棒１４を接続する小内径部７によって構成された形状となっているトリポード型等速ジョイント外輪があるが、この外輪を丸型のソレノイドコイル（想像線で示す）１中に置いた状態で加熱すると、前記コイル１に近く肉厚の薄い大内径部の温度は前記コイル１から遠く肉厚の厚い小内径部に比べて高くなる。   Further, as shown in FIG. 3, the constant velocity joint is connected with three track grooves 14, a large inner diameter portion 6 that connects the opposing roller guide surfaces 15 constituting the track grooves 14, and each track rod 14. There is a tripod type constant velocity joint outer ring having a shape constituted by a small inner diameter portion 7. When this outer ring is heated in a state where it is placed in a round solenoid coil (shown by an imaginary line) 1, The temperature of the large inner diameter portion having a thin wall thickness close to 1 is higher than that of the small inner diameter portion being far from the coil 1 and thick.

一般に、焼入れにより硬化した部分では、加熱時間が同じ場合、加熱温度が高いほど硬度の低下量は大きくなる。したがって、焼戻し後の大内径部の硬度は小内径部に比べ低くなる。   Generally, in the portion cured by quenching, when the heating time is the same, the amount of decrease in hardness increases as the heating temperature increases. Therefore, the hardness of the large inner diameter portion after tempering is lower than that of the small inner diameter portion.

そのため、小内径部で規定の硬度を得ようとすると（等速ジョイント外輪では製品の強度に基づいて焼戻し後の硬度を規定している）小内径部より大内径部の温度が高くなり、大内径部の硬度が、規定の下限または規定の下限を下回る問題がある。   Therefore, when trying to obtain the specified hardness at the small inner diameter part (the constant velocity joint outer ring defines the hardness after tempering based on the strength of the product), the temperature of the large inner diameter part becomes higher than the small inner diameter part, There is a problem that the hardness of the inner diameter portion is lower than the specified lower limit or the specified lower limit.

この問題を解決する一つの方法として、（特許文献１）には、外輪のステム部とカップ部の外側にそれぞれ誘導加熱コイルを設けて誘導加熱と注水を行なって焼戻しする方法がある。   As one method for solving this problem, Patent Document 1 discloses a method in which induction heating coils are provided on the outer side of the stem portion and the cup portion of the outer ring, respectively, and induction heating and water injection are performed for tempering.

特開平５−９５８４号公報Japanese Patent Laid-Open No. 5-9584

しかしながら、外輪のステム部とカップ部の外側にコイルが配置される方法では、カップ内部のコイルに近くて肉厚の薄い大内径部の温度が、コイルから遠くて肉厚の厚い小内径部に比べて高くなる問題がある。   However, in the method in which the coil is disposed outside the stem portion and the cup portion of the outer ring, the temperature of the large inner diameter portion that is close to the coil inside the cup and is thin is changed to the small inner diameter portion that is far from the coil and is thick. There is a problem that becomes higher than that.

そこで、この発明の課題は、焼戻し後の硬度を均一にすること、焼戻し温度の調整も簡単にできるようにすること、コイルの共用化による省力化も図れるようにすることである。   Therefore, an object of the present invention is to make the hardness after tempering uniform, to easily adjust the tempering temperature, and to save labor by sharing a coil.

上記の課題を解決するため、この発明では、等速ジョイント外輪の軸部を誘導加熱用の外コイルに挿入し、一方、前記外輪のカップ内に誘導加熱用の内コイルを挿入して、前記外コイルと外コイル用高周波電源とを接続し、内コイルと内コイル用高周波電源とを接続して、その外コイル用電源と内コイル用電源の出力を調整し、外コイルと内コイルへ供給する各々の高周波電流を調整して、焼戻しのための誘導加熱を行なう方法を採用したのである。   In order to solve the above problems, in the present invention, the shaft portion of the constant velocity joint outer ring is inserted into the outer coil for induction heating, while the inner coil for induction heating is inserted into the cup of the outer ring, Connect the outer coil and the high frequency power supply for the outer coil, connect the inner coil and the high frequency power supply for the inner coil, adjust the output of the power supply for the outer coil and the power supply for the inner coil, and supply to the outer coil and the inner coil The method of adjusting the high-frequency current to perform induction heating for tempering was adopted.

このような方法を採用することにより、外輪の軸部とカップ部を加熱するコイルを個別に設け、高周波電源もそれぞれ別に設けたので、これにより、軸部とカップ部の温度バランスの調整を高周波電源の出力調整で行なって、両者の温度差を小さくできる。さらに、カップの内側にコイルを配置することにより、肉厚の厚い小内径側がコイルと近くなり、外側にコイルを配置した場合に比べて温度が上がりやすくなり、大内径部と小内径部の温度差が小さくなる。   By adopting such a method, the coil for heating the shaft part and the cup part of the outer ring is provided separately, and the high-frequency power supply is also provided separately, so that the temperature balance between the shaft part and the cup part can be adjusted. By adjusting the output of the power supply, the temperature difference between the two can be reduced. Furthermore, by arranging the coil inside the cup, the thick inner diameter side is closer to the coil, and the temperature is more likely to rise compared to the case where the coil is arranged outside, and the temperatures of the large inner diameter part and the small inner diameter part are increased. The difference becomes smaller.

また、等速ジョイント外輪の軸部が挿入される外コイルと、前記外輪のカップ内に挿入される内コイルとからなり、前記外コイルは、外コイル用高周波電源と接続され、一方、内コイルは、内コイル用高周波電源と接続されて、その外コイル用電源と内コイル用電源の出力を調整し、外コイルと内コイルへ供給する各々の高周波電流を調整して、焼戻しのための誘導加熱を行なう構成を採用することができる。   Further, the outer coil includes an outer coil into which the shaft portion of the constant velocity joint outer ring is inserted and an inner coil inserted into the cup of the outer ring, and the outer coil is connected to a high frequency power source for the outer coil, Is connected to the high frequency power source for the inner coil, adjusts the output of the power source for the outer coil and the power source for the inner coil, adjusts the respective high frequency currents supplied to the outer coil and the inner coil, and induces induction for tempering. A configuration in which heating is performed can be employed.

このような構成を採用することにより、外輪の軸部とカップ部を誘導加熱する外コイルと内コイルへ供給する高周波電流を、外コイル用高周波電源と内コイル用高周波電源とで個別に調整して、外輪の軸部とカップ部との温度差と、さらに内コイルの使用によりカップ内部の大内径部と小内径部の温度差を小さくできる。   By adopting such a configuration, the high frequency current supplied to the outer coil and the inner coil for induction heating of the shaft portion and the cup portion of the outer ring can be individually adjusted by the high frequency power source for the outer coil and the high frequency power source for the inner coil. Thus, the temperature difference between the shaft portion of the outer ring and the cup portion and the temperature difference between the large inner diameter portion and the small inner diameter portion inside the cup can be reduced by using the inner coil.

また、等速ジョイント外輪の軸部が挿入される外コイルと、前記外輪のカップ内に挿入される内コイルと、前記外コイルに高周波電流を供給する外コイル用高周波電源と、内コイルに高周波電流を供給する内コイル用高周波電源を備え、前記外コイル用電源と内コイル用電源の出力を調整し、外コイルと内コイルへ供給する各々の高周波電流を調整して、焼戻しのための誘導加熱を行なう構成を採用することができる。   Also, an outer coil into which the shaft portion of the constant velocity joint outer ring is inserted, an inner coil inserted into the cup of the outer ring, a high frequency power source for an outer coil that supplies a high frequency current to the outer coil, and a high frequency to the inner coil A high frequency power supply for the inner coil that supplies current, adjusts the outputs of the power supply for the outer coil and the power supply for the inner coil, adjusts the high frequency currents supplied to the outer coil and the inner coil, and induction for tempering A configuration in which heating is performed can be employed.

このような構成を採用することにより、外コイル用高周波電源と内コイル用高周波電源とで個別に調整して外輪の軸部とカップ部との温度差と、さらに内コイルの使用によりカップ内部の大内径部と小内径部の温度差を小さくして焼戻しを行なうので、焼戻し後の硬度を均一に保つことができる。   By adopting such a configuration, the high frequency power supply for the outer coil and the high frequency power supply for the inner coil are individually adjusted, the temperature difference between the shaft portion of the outer ring and the cup portion, and the use of the inner coil, Tempering is performed by reducing the temperature difference between the large inner diameter portion and the small inner diameter portion, so that the hardness after tempering can be kept uniform.

この発明は、以上のように構成したことにより、誘導加熱した場合のカップ内部の温度差を小さくできるため、焼戻しによる部分的な硬度低下量のばらつきを低減でき、焼戻し後の硬度を均一に保つことができる。また、軸部とカップ部の焼戻し温度バランスの調整を、それぞれのコイルに設けた高周波電源の出力調整で行なえるため、品質調整時間の短縮と加熱コイルの共用化を図ることができる。   Since the present invention is configured as described above, the temperature difference inside the cup when induction heating is performed can be reduced, so that variation in the amount of partial hardness reduction due to tempering can be reduced, and the hardness after tempering can be kept uniform. be able to. In addition, since the tempering temperature balance between the shaft portion and the cup portion can be adjusted by adjusting the output of the high-frequency power source provided in each coil, the quality adjustment time can be shortened and the heating coil can be shared.

以下、この発明を実施するための最良の形態を図面に基づいて説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

この形態の焼戻し装置は、図１及び図２に示すように、外コイル１０、内コイル１１、外コイル用高周波電源１２、内コイル用高周波電源１３を備えたものである。   As shown in FIGS. 1 and 2, the tempering apparatus of this embodiment includes an outer coil 10, an inner coil 11, an outer coil high frequency power source 12, and an inner coil high frequency power source 13.

外コイル１０は、等速ジョイント外輪（以下、ワーク）３の軸部４が挿入されて、軸全体を被うもので、カップ部５を被わないようになっており、この形態では、マルチターンコイルを使用している。また、外コイル１０は、ワーク３の軸部４が挿入されるので、図２のように、ヘアピンコイルを使用するようにもできる。   The outer coil 10 has a shaft portion 4 of a constant velocity joint outer ring (hereinafter referred to as a workpiece) 3 inserted therein and covers the entire shaft, and does not cover the cup portion 5. A turn coil is used. Moreover, since the axial part 4 of the workpiece | work 3 is inserted in the outer coil 10, a hairpin coil can also be used like FIG.

内コイル１１は、ワーク３のカップ部５の内側へ挿入する。そのため、カップ部５の内側に挿入できるようにマルチターンコイルを使用している。   The inner coil 11 is inserted inside the cup portion 5 of the work 3. Therefore, a multi-turn coil is used so that it can be inserted inside the cup portion 5.

外コイル用高周波電源１２と内コイル用高周波電源１３は、両電源ともトランジスタ式インバータで、各々独立した電源となっている。また、外コイル用高周波電源１２は外コイル１０と接続して、外コイル１０へ供給する高周波電力の周波数、出力を調整できるようになっている。一方、内コイル用高周波電源１３は、内コイル１１と接続して内コイル１１へ供給する高周波電力の周波数、出力を調整できるようになっており、内外コイル１０，１１ごとに個別に制御できるようになっている。これらの電源は、図示はしていないが、制御用のシーケンサ等と接続されており、電力、加熱時間などを予めプログラムに設定して実行できるようにしてある。   The high frequency power supply 12 for the outer coil and the high frequency power supply 13 for the inner coil are both transistor-type inverters and are independent power supplies. Further, the high frequency power supply 12 for the outer coil is connected to the outer coil 10 so that the frequency and output of the high frequency power supplied to the outer coil 10 can be adjusted. On the other hand, the high frequency power supply 13 for the inner coil is connected to the inner coil 11 and can adjust the frequency and output of the high frequency power supplied to the inner coil 11 so that the inner and outer coils 10 and 11 can be controlled individually. It has become. Although not shown, these power supplies are connected to a control sequencer or the like, and can be executed by setting power, heating time, etc. in a program in advance.

この形態は上記のように構成されており、次に、この焼戻し装置に、トリポード型等速ジョイント外輪をワーク３としてセットし、焼戻しの加工サイクル動作を述べることにより、この発明の誘導加熱方法を説明する。   This embodiment is configured as described above. Next, the induction heating method of the present invention is described by setting the tripod type constant velocity joint outer ring as the work 3 in the tempering apparatus and describing the tempering processing cycle operation. explain.

ワーク３は図３に示すように軸方向に伸びる向かい合ったローラ案内面１５でトラック溝１４を構成しており、３本のトラック溝１４が１２０度の間隔で形成されている。向かい合ったローラ案内面１５は大内径部６によって結ばれており、それぞれのトラック溝１４は小内径部７によって接続された形状となっている。   As shown in FIG. 3, the work 3 includes track grooves 14 formed by opposed roller guide surfaces 15 extending in the axial direction, and the three track grooves 14 are formed at intervals of 120 degrees. The roller guide surfaces 15 facing each other are connected by the large inner diameter portion 6, and each track groove 14 is connected by the small inner diameter portion 7.

このワーク３には、外コイル１０と内コイル１１を装着して所定の位置に配置する。すなわち、ワーク３の軸部４を外コイル１０に挿入し、カップ部５の内側に内コイル１１を挿入する。また、図示はしていないが、下治具と上センター治具で支持し、焼戻し装置にセットする。そして、各々外コイル１０と内コイル１１に接続した高周波電源１２，１３から高周波電流を供給し加熱する。このとき、周方向の温度ムラが大きい場合はワーク３を回転させる。加熱は予め設定したプログラムに基づいて行い軸部４の外径の硬化部と、カップ部５の内径の硬化部が焼戻しに必要な温度域に入るように制御する。   An outer coil 10 and an inner coil 11 are attached to the work 3 and arranged at predetermined positions. That is, the shaft portion 4 of the work 3 is inserted into the outer coil 10, and the inner coil 11 is inserted inside the cup portion 5. Although not shown, it is supported by a lower jig and an upper center jig and set in a tempering device. Then, a high frequency current is supplied from the high frequency power sources 12 and 13 connected to the outer coil 10 and the inner coil 11 to heat them. At this time, when the temperature unevenness in the circumferential direction is large, the work 3 is rotated. The heating is performed based on a preset program and is controlled such that the outer diameter hardened portion of the shaft portion 4 and the inner diameter hardened portion of the cup portion 5 enter a temperature range necessary for tempering.

このため、誘導加熱時の軸部４の外径とカップ部５の内側の温度差を小さくして焼戻しによる部分的な硬度低下量のばらつきを低減し、焼戻し後の硬度を均一に保つことができる。   For this reason, the temperature difference between the outer diameter of the shaft portion 4 and the inner side of the cup portion 5 at the time of induction heating can be reduced to reduce variation in the amount of partial hardness reduction due to tempering, and to maintain uniform hardness after tempering. it can.

このように、軸部４とカップ部５の焼戻し温度バランスの調整を外コイル１０と内コイル１１に設けた高周波電源１２，１３の出力の調整で行なえるので、品質調整時間の短縮が図れる。また、高周波電源１２，１３の出力の調整で、コイルの形状やコイルとワークの位置を調整しなくとも温度を調整できるので、誘導加熱コイルの共用化を図ることができる。さらに、一度の加熱で軸部４とカップ部５の加熱ができる。   Thus, the adjustment of the tempering temperature balance between the shaft portion 4 and the cup portion 5 can be performed by adjusting the outputs of the high-frequency power sources 12 and 13 provided in the outer coil 10 and the inner coil 11, so that the quality adjustment time can be shortened. Further, since the temperature can be adjusted by adjusting the outputs of the high-frequency power sources 12 and 13 without adjusting the shape of the coil and the position of the coil and the workpiece, the induction heating coil can be shared. Furthermore, the shaft part 4 and the cup part 5 can be heated by one heating.

また、このように、カップ５の内側に内コイル１１を挿入して加熱すると、トリポード型等速ジョイント外輪では、図３の点線で示す内コイル１１がカップ部５の内側にあることで、肉厚の厚い小内径部７と内コイル１１との距離の方が、図３の想像線で示すコイル１よりも近くなる。そのため、温度が上昇しやすくなって肉厚の薄い大内径部６との温度差が、図４から図５に示すように小さくなり、焼戻しに必要な温度領域Ｔ１−Ｔ２に収まるため、規定の硬度が得られる。   Further, when the inner coil 11 is inserted and heated inside the cup 5 in this way, in the tripod type constant velocity joint outer ring, the inner coil 11 indicated by the dotted line in FIG. The distance between the thick small inner diameter portion 7 and the inner coil 11 is closer than the coil 1 indicated by the imaginary line in FIG. Therefore, the temperature is likely to rise, and the temperature difference from the thin large inner diameter portion 6 is reduced as shown in FIG. 4 to FIG. Hardness is obtained.

このように、加熱が終了すると、所定の時間冷却水で冷却して加工を終了する。   As described above, when the heating is finished, the processing is finished by cooling with cooling water for a predetermined time.

なお、加熱出力、加熱時間は製品形状により適宜決められるものである。   The heating output and the heating time are appropriately determined depending on the product shape.

実施形態の模式図Schematic diagram of the embodiment 実施形態の模式図Schematic diagram of the embodiment 実施形態の要部の断面図Sectional drawing of the principal part of embodiment 実施形態の作用説明図Action explanatory diagram of the embodiment 実施形態の作用説明図Action explanatory diagram of the embodiment （ａ）従来例の平面図（ｂ）従来例の断面図(A) Plan view of conventional example (b) Cross-sectional view of conventional example （ａ）従来例の平面図（ｂ）従来例の正面図(A) Plan view of conventional example (b) Front view of conventional example 従来例の作用説明図Action explanatory diagram of conventional example

符号の説明Explanation of symbols

３ ワーク
４ 軸部
５ カップ
１０ 外コイル
１１ 内コイル
１２ 外コイル用高周波電源
１３ 内コイル用高周波電源
１４ トラック溝
１５ ローラ案内面 3 Work 4 Shaft part 5 Cup 10 Outer coil 11 Inner coil 12 High frequency power source for outer coil 13 High frequency power source for inner coil 14 Track groove 15 Roller guide surface

Claims (1)

向かい合ったローラ案内面をもつ３本のトラック溝が内径側に形成されたトリポード型等速ジョイント外輪の軸部を誘導加熱用の外コイルに挿入し、前記外輪の肉厚の薄い大内径部と肉厚の厚い小内径部とを有するカップ内に誘導加熱用の内コイルを挿入して、前記外コイルと外コイル用高周波電源とを接続し、内コイルと内コイル用高周波電源とを接続して、その外コイル用電源と内コイル用電源の出力を調整し、外コイルと内コイルへ供給する各々の高周波電流を調整して、前記等速ジョイント外輪の焼戻しのための誘導加熱を行なう内外コイルによる誘導加熱方法。
The shaft portion of a tripod type constant velocity joint outer ring having three track grooves with opposed roller guide surfaces formed on the inner diameter side is inserted into the outer coil for induction heating, An inner coil for induction heating is inserted into a cup having a thick small inner diameter portion, the outer coil and the high frequency power supply for the outer coil are connected, and the inner coil and the high frequency power supply for the inner coil are connected. Adjusting the output of the power supply for the outer coil and the power supply for the inner coil, adjusting the respective high-frequency currents supplied to the outer coil and the inner coil, and performing induction heating for tempering the constant velocity joint outer ring. Induction heating method using coils.
JP2006081967A 2006-03-24 2006-03-24 Induction heating method with inner and outer coils for tempering constant velocity joint outer ring Active JP5015478B2 (en)

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04120212A (en) * 1990-09-07 1992-04-21 Denki Kogyo Co Ltd High frequency tempering method
JPH059584A (en) * 1991-06-28 1993-01-19 Ntn Corp Heat treatment of outer ring of uniform-speed universal joint
JPH07224327A (en) * 1993-07-21 1995-08-22 Fuji Denshi Kogyo Kk High-frequency hardening method and high-frequency hardening device of nearly cylindrical work
JPH07305117A (en) * 1994-05-06 1995-11-21 Fuji Denshi Kogyo Kk Quenching apparatus for constant velocity joint
JP3408982B2 (en) * 1999-01-06 2003-05-19 富士電子工業株式会社 Induction hardening equipment for constant velocity joints
JP3966494B2 (en) * 2000-03-28 2007-08-29 高周波熱錬株式会社 Tempering method

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