JP2010018845A - Apparatus and method for tempering with high-frequency induction heating - Google Patents

Apparatus and method for tempering with high-frequency induction heating Download PDF

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JP2010018845A
JP2010018845A JP2008180463A JP2008180463A JP2010018845A JP 2010018845 A JP2010018845 A JP 2010018845A JP 2008180463 A JP2008180463 A JP 2008180463A JP 2008180463 A JP2008180463 A JP 2008180463A JP 2010018845 A JP2010018845 A JP 2010018845A
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induction heating
heating coil
tempering
coil
outer diameter
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JP5231109B2 (en
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Shintaro Suzuki
慎太郎 鈴木
Masami Yamaguchi
昌巳 山口
Kazuo Oda
和男 尾田
Atsushi Kobayashi
厚 小林
Hidehiro Yasutake
英宏 安武
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NTN Corp
Neturen Co Ltd
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Neturen Co Ltd
NTN Toyo Bearing Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for tempering with a high-frequency induction-heating, wherein with respect to the whole heat-hardening layer to be formed in a workpiece having a cylindrical surface of the different diameters on the outer diameter surface, the tempering performance is improved by heating into the temperature range needed to the tempering. <P>SOLUTION: As for the workpiece having the cylindrical surface with the different diameters on the outer diameter surface, when the hardened layer S at a stepped part 39 or at the neighborhood of the stepped part on the outer diameter surface of the small diameter part, is tempered, the high-frequency current is impressed to a first induction-heating coil 35 surrounding the small diameter part and a second induction-heating coil 38 to generate alternating current magnetic field in the first induction-heating coil 35. Thus, the alternating current is caused to flow into the second induction-heating coil 38 surrounding the stepped part 39 or the neighborhood of the stepped part to generate the alternating current magnetic field in the second induction-heating coil 38. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、車輪用軸受装置のハブ輪や等速自在継手の外側継手部材等の外径面に径が異なる円筒面を有するワークに形成された硬化層を焼戻するための高周波誘導加熱焼戻装置および高周波誘導加熱焼戻方法に関する。   The present invention relates to high-frequency induction heating and tempering for tempering a hardened layer formed on a workpiece having cylindrical surfaces with different diameters on the outer diameter surface of a hub wheel of a wheel bearing device or an outer joint member of a constant velocity universal joint. The present invention relates to a return device and a high-frequency induction heating and tempering method.

外径面に径が異なる円筒面を有するワークとしては、図5に示すような等速自在継手の外側継手部材(外輪)1や図7に示すような車輪用軸受装置に用いられるハブ輪10等がある。これらにおいては、小径部の外径面に大径部との間の段付部乃至段付部近傍に至る硬化層が形成されることになる。硬化層は、焼入れ・焼戻しの熱処理を行うことによって形成する。ここで、焼入れとは、鋼をオーステナイト組織の状態に加熱した後、水または油で急冷することによって、マルテンサイト組織の状態に変化させる熱処理である。このように、焼入れは鋼の硬さを増大させる目的で行われるが、靭性が低下するので、粘り強さを得るために、焼入れ後には焼戻しを行う。焼戻しは、マルテンサイト組織の状態から鋼を再加熱し、一定時間保持した後に徐冷する作業をいう。   As a workpiece having cylindrical surfaces with different diameters on the outer diameter surface, an outer joint member (outer ring) 1 of a constant velocity universal joint as shown in FIG. 5 or a hub wheel 10 used in a wheel bearing device as shown in FIG. Etc. In these, a hardened layer is formed on the outer diameter surface of the small diameter portion so as to reach the stepped portion between the large diameter portion and the vicinity of the stepped portion. The hardened layer is formed by performing a heat treatment such as quenching and tempering. Here, quenching is a heat treatment in which the steel is heated to an austenite structure and then rapidly cooled with water or oil to change it to a martensite structure. Thus, quenching is performed for the purpose of increasing the hardness of the steel, but since the toughness is reduced, tempering is performed after quenching in order to obtain tenacity. Tempering refers to an operation of reheating steel from a martensitic structure, holding it for a certain period of time, and then gradually cooling it.

図5に示す外輪1は、内面2aにトラック溝(図示省略)が形成されたマウス部2と、このマウス部2の底壁から突設されるステム部3とからなる。ステム部3は、大径の基部3aと、基部3aに連設される中径の本体部3bと、本体部3bに連設される先端部3cとからなる。そして、熱硬化処理層Sが基部3aから先端部3cにわたって形成される。すなわち、熱硬化処理層Sは、小径部としてのステム部3の外径面に、段付部(マウス部2の底壁から延びるステム部3の付け根部9)近傍にいたる熱硬化処理層Sが形成されている。また、マウス部2の内面2aにも熱硬化処理層S1が形成される。   An outer ring 1 shown in FIG. 5 includes a mouth portion 2 having a track groove (not shown) formed on an inner surface 2a, and a stem portion 3 protruding from the bottom wall of the mouth portion 2. The stem portion 3 includes a large-diameter base portion 3a, a medium-diameter main body portion 3b provided continuously with the base portion 3a, and a tip portion 3c provided continuously with the main body portion 3b. And the thermosetting process layer S is formed ranging from the base 3a to the front-end | tip part 3c. That is, the thermosetting treatment layer S is formed on the outer diameter surface of the stem portion 3 as a small-diameter portion and near the stepped portion (the root portion 9 of the stem portion 3 extending from the bottom wall of the mouse portion 2). Is formed. Further, the thermosetting layer S1 is also formed on the inner surface 2a of the mouse part 2.

ステム部3の熱硬化処理層Sは、従来から高周波誘導加熱を用いた焼戻しを行う方法が知られている(特許文献1)。高周波誘導加熱焼戻装置としては、図5に示すような丸形のソレノイドコイル5が用いられる。すなわち、外輪1をそのマウス部2の開口部が下方に開口する状態として、下治具6と上治具7とで支持する。この状態で、ソレノイドコイル5にこの外輪1が内嵌される。   Conventionally, a method of performing tempering using high-frequency induction heating is known for the thermosetting layer S of the stem portion 3 (Patent Document 1). As a high-frequency induction heating and tempering device, a round solenoid coil 5 as shown in FIG. 5 is used. That is, the outer ring 1 is supported by the lower jig 6 and the upper jig 7 in a state where the opening of the mouse portion 2 opens downward. In this state, the outer ring 1 is fitted into the solenoid coil 5.

次に、コイル5に高周波電流を流すことで、電磁誘導によって外輪1の表面に高周波磁束による誘導電流が流れ、この電流により外輪1のもつ抵抗によってエネルギーを損失して熱が発生する。そして、外輪1の表面が所定温度に上昇したところで、その加熱を停止して、その温度を一定時間保持した後、冷却水で冷却することによって焼戻しを行って、この熱処理が終了する。   Next, when a high frequency current is passed through the coil 5, an induced current caused by a high frequency magnetic flux flows on the surface of the outer ring 1 by electromagnetic induction, and heat is generated by losing energy due to the resistance of the outer ring 1. Then, when the surface of the outer ring 1 rises to a predetermined temperature, the heating is stopped, the temperature is maintained for a certain time, and then tempering is performed by cooling with cooling water, and this heat treatment is completed.

また、図7に示すように、車輪用軸受装置の用いられるハブ輪10においても熱硬化処理層を形成することになる。すなわち、ハブ輪10は、軸部11と、この軸部11の一端側において外径側へと突出するフランジ部12とを備える。軸部11の外表面に熱硬化処理層S2が形成される。すなわち、熱硬化処理層S2は、小径部としての軸部11の外径面に、段付部(フランジ部12から延びる軸部11の付け根部14)近傍にいたる熱硬化処理層S2が形成されている。なお、軸部11のフランジ部12側端面にはホイールおよびブレーキロータが装着される短筒状のパイロット部13が突設されている。   Further, as shown in FIG. 7, a thermosetting layer is also formed on the hub wheel 10 in which the wheel bearing device is used. That is, the hub wheel 10 includes a shaft portion 11 and a flange portion 12 that protrudes toward the outer diameter side at one end side of the shaft portion 11. A thermosetting layer S <b> 2 is formed on the outer surface of the shaft portion 11. That is, the thermosetting layer S2 is formed on the outer diameter surface of the shaft portion 11 as a small-diameter portion, near the stepped portion (the base portion 14 of the shaft portion 11 extending from the flange portion 12). ing. In addition, a short cylindrical pilot portion 13 to which a wheel and a brake rotor are mounted projects from the end surface of the shaft portion 11 on the flange portion 12 side.

軸部11は、フランジ部12側のボス部11aと、ボス部11aに連設される小径の本体部11bとを備える。ボス部11aは、大径部15と中径部16と小径部17とを有し、小径部17と本体部11bとの間に段差18が設けられている。そして、ボス部11aから本体部11bにわたって熱硬化処理層S2が形成されている。なお、ボス部11aの中径部16は、軸受装置の転動体(ボール)20の転走面(転走溝)を構成する。   The shaft portion 11 includes a boss portion 11a on the flange portion 12 side, and a small-diameter main body portion 11b provided continuously to the boss portion 11a. The boss part 11a has a large diameter part 15, a medium diameter part 16, and a small diameter part 17, and a step 18 is provided between the small diameter part 17 and the main body part 11b. A thermosetting layer S2 is formed from the boss portion 11a to the main body portion 11b. In addition, the medium diameter part 16 of the boss | hub part 11a comprises the rolling surface (rolling groove) of the rolling element (ball) 20 of a bearing apparatus.

この場合の高周波誘導加熱焼戻装置も、図5に示した高周波誘導加熱焼戻装置と同様、ソレノイドコイル5を備えたものを使用する。ハブ輪10をそのパイロット部の開口部が下方に開口する状態として、下治具6と上治具7とで支持する。この状態で、ソレノイドコイル5にハブ輪10の軸部11が内嵌される。そして、コイル5に高周波電流を流すことになる。   As the high-frequency induction heating and tempering device in this case, the one provided with the solenoid coil 5 is used similarly to the high-frequency induction heating and tempering device shown in FIG. The hub wheel 10 is supported by the lower jig 6 and the upper jig 7 in a state where the opening of the pilot portion opens downward. In this state, the shaft portion 11 of the hub wheel 10 is fitted into the solenoid coil 5. Then, a high-frequency current is passed through the coil 5.

図5に示すような外輪1では、ステム部3およびマウス部2に硬化層S、S1を形成する必要があるため、この両者側において焼戻しを行うことになる。しかしながら、図5に示すようなものでは、ソレノイドコイル5の内部にワーク(外輪)を置き、外輪全体を加熱している。この場合、コイル5に近接しているマウス部2側に磁束が集中するため、ステム部3の付け根部(根元部分)9では加熱され難い。このため、図9に示すように、焼戻しに必要な温度域にまで上昇しない問題がある。なお、図9において、グラフAは図5におけるA部の温度変化であり、グラフBは図5におけるB部の温度変化であり、グラフCは図5におけるC部の温度変化である。   In the outer ring 1 as shown in FIG. 5, since it is necessary to form the hardened layers S and S1 on the stem portion 3 and the mouse portion 2, tempering is performed on both sides. However, in the case shown in FIG. 5, a work (outer ring) is placed inside the solenoid coil 5 and the entire outer ring is heated. In this case, since the magnetic flux concentrates on the side of the mouse part 2 close to the coil 5, the root part (root part) 9 of the stem part 3 is hardly heated. For this reason, as shown in FIG. 9, there exists a problem which does not rise to the temperature range required for tempering. In FIG. 9, graph A is a temperature change at A part in FIG. 5, graph B is a temperature change at B part in FIG. 5, and graph C is a temperature change at C part in FIG. 5.

また、ハブ輪10の場合、転走溝が大径のフランジ部12近傍に配置されるので、焼戻しが必要な転走溝に対しての温度上昇が不十分となる。なお、図9において、グラフA1は図7におけるA1部の温度変化であり、グラフB1は図7におけるB1部の温度変化であり、グラフC1は図7におけるC1部の温度変化である。なお、図9において、T1とT2との間が焼戻しに必要な温度である。
特開平5−9584号公報
Moreover, in the case of the hub wheel 10, since the rolling groove is disposed in the vicinity of the large-diameter flange portion 12, the temperature rise with respect to the rolling groove requiring tempering becomes insufficient. In FIG. 9, a graph A1 is a temperature change at A1 portion in FIG. 7, a graph B1 is a temperature change at B1 portion in FIG. 7, and a graph C1 is a temperature change at C1 portion in FIG. In FIG. 9, the temperature required for tempering is between T1 and T2.
Japanese Patent Laid-Open No. 5-9584

そこで、外輪1においては、図6に示すように、ステム部の付け根部(根元部分)9近傍において、ソレノイドコイル5の径を小さくした小径部位5aを形成する。ハブ輪10においては、図8に示すように、フランジ部12の近傍において、ソレノイドコイル5の径を小さくした小径部位5bを形成する。   Therefore, in the outer ring 1, as shown in FIG. 6, a small-diameter portion 5a in which the diameter of the solenoid coil 5 is reduced is formed in the vicinity of the root portion (root portion) 9 of the stem portion. In the hub wheel 10, as shown in FIG. 8, a small-diameter portion 5 b in which the diameter of the solenoid coil 5 is reduced is formed in the vicinity of the flange portion 12.

これによって、図10に示すように、図6におけるA部、B部、C部の温度変化が図10に示すグラフのように変化し、図8におけるA1部、B1部、C1部の温度変化が図10に示すグラフのように変化する。このように、各部位において、焼戻しに必要な温度に上昇させることができる。なお、図10において、T1とT2との間が焼戻しに必要な温度である。   As a result, as shown in FIG. 10, the temperature changes in the A part, B part, and C part in FIG. 6 change as shown in the graph in FIG. 10, and the temperature changes in the A1, B1, and C1 parts in FIG. Changes as shown in the graph of FIG. In this way, the temperature can be raised to the temperature required for tempering at each part. In FIG. 10, the temperature between T1 and T2 is a temperature necessary for tempering.

図6や図8に示すようにソレノイドコイル5において、小径部位5a、5bを形成した場合、コイル径は、この小径部位5a、5bと他の部位とマウス部対応部等との温度バランスを考慮する必要がある。このため、例えば、過去の経験にもとづいて決定することになり、最適な温度制御が困難であった。   As shown in FIGS. 6 and 8, when the small diameter portions 5a and 5b are formed in the solenoid coil 5, the coil diameter takes into consideration the temperature balance between the small diameter portions 5a and 5b and other portions and the corresponding portion of the mouse portion. There is a need to. For this reason, for example, it will be determined based on past experience, and optimal temperature control has been difficult.

また、図6や図8に示すうようなソレノイドコイル5を形成する場合、小径部位5a、5bと、他の部位とをそれぞれ別個に製造し、これらを例えばロウ付け等にて接合することになる。このため、多大な製作工数を有し、作業性に劣ると共に、コスト高となる。また、製品のサイズやステム部の形状、長さ等により、最適なコイルの径は種々ある。このため、製品毎にコイルを必要とし、コイルの管理性に劣るとともに、コスト高を招くことになる。   When the solenoid coil 5 as shown in FIGS. 6 and 8 is formed, the small-diameter portions 5a and 5b and the other portions are separately manufactured, and these are joined by brazing or the like, for example. Become. For this reason, it has a great production man-hour, is inferior in workability, and increases in cost. There are various optimum coil diameters depending on the size of the product, the shape and length of the stem portion, and the like. For this reason, a coil is required for each product, which is inferior in manageability of the coil and incurs high costs.

本発明は、上記課題に鑑みて、外径面に径が異なる円筒面を有するワークの形成すべき熱硬化層全体に対して、焼戻しに必要な温度域に上昇させて焼戻処理性能の向上を図ることができる高周波誘導加熱焼戻装置および高周波誘導加熱焼戻方法を提供する。   In view of the above problems, the present invention improves the tempering performance by raising the entire thermosetting layer to be formed of a work having cylindrical surfaces with different diameters on the outer diameter surface to a temperature range necessary for tempering. A high frequency induction heating and tempering apparatus and a high frequency induction heating and tempering method that can achieve the above are provided.

本発明の高周波誘導加熱焼戻装置は、外径面に径が異なる円筒面を有するワークにおいて、その小径部の外径面に大径部との間の段付部乃至段付部近傍に至る部分に形成した硬化層を焼戻すための高周波誘導加熱焼戻装置であって、硬化層が形成される小径部の少なくとも全体を包囲する第1誘導加熱コイルと、段付部に近接してこの段付部を包囲する第2誘導加熱コイルとを備え、第1誘導加熱コイルはその外径及び内径がそれぞれ軸方向に沿って略同一設定されるとともに、第1誘導加熱コイルと第2誘導加熱コイルとが電気的に非接触とされ、第1誘導加熱コイルへの高周波電流の印加にて第2誘導加熱コイルに交流磁界を発生させるものである。   The high-frequency induction heating and tempering apparatus according to the present invention is a workpiece having cylindrical surfaces with different diameters on the outer diameter surface, and reaches the stepped portion between the outer diameter surface of the small diameter portion and the large diameter portion or near the stepped portion. A high-frequency induction heating and tempering device for tempering a hardened layer formed on a part, wherein the first induction heating coil surrounds at least the entire small diameter part on which the hardened layer is formed, A second induction heating coil surrounding the stepped portion, and the first induction heating coil has an outer diameter and an inner diameter substantially the same along the axial direction, and the first induction heating coil and the second induction heating coil. The coil is electrically non-contact, and an AC magnetic field is generated in the second induction heating coil by applying a high frequency current to the first induction heating coil.

本発明の高周波誘導加熱焼戻装置によれば、第1誘導加熱コイルに高周波電流を印加すれば、この第1誘導加熱コイルに交流磁界が発生する。第1誘導加熱コイルの交流磁界によって、第2誘導加熱コイルに誘導電圧が発生する。第2誘導加熱コイルに誘導電圧が発生することによって、第2誘導加熱コイルに交流電流が流れる。このため、第2誘導加熱コイルに交流磁界が発生し、第2誘導加熱コイルにて包囲されている段付部乃至段付部近傍を誘導加熱することができる。   According to the high frequency induction heating and tempering apparatus of the present invention, when a high frequency current is applied to the first induction heating coil, an alternating magnetic field is generated in the first induction heating coil. An induction voltage is generated in the second induction heating coil by the alternating magnetic field of the first induction heating coil. When an induction voltage is generated in the second induction heating coil, an alternating current flows through the second induction heating coil. For this reason, an alternating magnetic field is generated in the second induction heating coil, and the stepped portion or the vicinity of the stepped portion surrounded by the second induction heating coil can be induction heated.

すなわち、第1誘導加熱コイルに高周波電流を印加することによって、第1誘導加熱コイル及び第1誘導加熱コイル内に配置される第2誘導加熱コイルにそれぞれ交流磁界が発生することになる。このように、第1誘導加熱コイルに交流磁界が発生すれば、この第1誘導加熱コイルに包囲されている範囲においてそのワーク外表面を誘導加熱することができ、第2誘導加熱コイルにて包囲されている段付部乃至段付部近傍を誘導加熱することができる。   That is, by applying a high frequency current to the first induction heating coil, an alternating magnetic field is generated in each of the first induction heating coil and the second induction heating coil disposed in the first induction heating coil. In this way, if an AC magnetic field is generated in the first induction heating coil, the outer surface of the workpiece can be induction heated in a range surrounded by the first induction heating coil, and the second induction heating coil surrounds it. The stepped portion or the vicinity of the stepped portion can be induction-heated.

第2誘導加熱コイルの径を大きくすれば、第1誘導加熱コイルとの間の距離(寸法)が小さくなり、第2誘導加熱コイルに生じる誘導電圧が大きくなる。逆に第2誘導加熱コイルの径を小さくすれば、第1誘導加熱コイルとの間の距離(寸法)が大きくなり、第2誘導加熱コイルに生じる誘導電圧が小さくなる。   If the diameter of the second induction heating coil is increased, the distance (dimension) between the first induction heating coil and the induction voltage generated in the second induction heating coil is increased. Conversely, if the diameter of the second induction heating coil is reduced, the distance (dimension) between the first induction heating coil and the induction voltage generated in the second induction heating coil is reduced.

第1誘導加熱コイルと第2誘導加熱コイルとは電気的に接続されていないので、各コイルを別個に交換したりすることができる。   Since the 1st induction heating coil and the 2nd induction heating coil are not electrically connected, each coil can be exchanged separately.

前記第2誘導加熱コイルは、その内部を冷却水が流通するのが好ましい。第2誘導加熱コイルを断面矩形のパイプ材の一つのリング状体からなるものであれば、この第2誘導加熱コイルを配置する際に、載置テーブル等に安定して設置することができる。   The second induction heating coil preferably has cooling water flowing therethrough. If the second induction heating coil is made of one ring-shaped body of a pipe member having a rectangular cross section, the second induction heating coil can be stably installed on a mounting table or the like when the second induction heating coil is arranged.

ワークとしては、車輪用軸受装置のハブ輪である場合や等速自在継手の外側継手部材である場合がある。   The workpiece may be a hub wheel of a wheel bearing device or an outer joint member of a constant velocity universal joint.

本発明の高周波誘導加熱焼戻方法は、外径面に径が異なる円筒面を有するワークにおいて、その小径部の外径面に大径部との間の段付部乃至段付部近傍に至る部分に形成した硬化層を焼戻すための高周波誘導加熱焼戻方法であって、前記小径部を包囲する第1誘導加熱コイルに高周波電流を印加して、この第1誘導加熱コイルに交流磁界を発生させ、これによって、段付部乃至段付部近傍を包囲する第2誘導加熱コイルに交流電流を流して、この第2誘導加熱コイルに交流磁界を発生させるものである。   In the high frequency induction heating and tempering method of the present invention, in a workpiece having cylindrical surfaces with different diameters on the outer diameter surface, the outer diameter surface of the small diameter portion reaches the stepped portion between the large diameter portion and the vicinity of the stepped portion. A high-frequency induction heating and tempering method for tempering a hardened layer formed on a portion, wherein a high-frequency current is applied to a first induction heating coil surrounding the small diameter portion, and an alternating magnetic field is applied to the first induction heating coil. Thus, an alternating current is passed through the second induction heating coil surrounding the stepped portion or the vicinity of the stepped portion to generate an alternating magnetic field in the second induction heating coil.

本発明の高周波誘導加熱焼戻方法によれば、第1誘導加熱コイルに高周波電流を印加することによって、第1誘導加熱コイル及び第1誘導加熱コイル内に配置される第2誘導加熱コイルにそれぞれ交流磁界が発生することになる。 According to the high frequency induction heating and tempering method of the present invention, by applying a high frequency current to the first induction heating coil, each of the first induction heating coil and the second induction heating coil disposed in the first induction heating coil is provided. An alternating magnetic field will be generated.

本発明では、第1誘導加熱コイルに交流磁界を発生させることによって、この第1誘導加熱コイルに包囲されている範囲においてそのワーク外表面を誘導加熱することができ、第2誘導加熱コイルにて包囲されている段付部乃至段付部近傍を誘導加熱することができる。このため、段付部乃至段付部近傍においても、焼戻しに必要な温度域に上昇させて焼戻処理性能の向上を図ることができる。   In the present invention, by generating an AC magnetic field in the first induction heating coil, the outer surface of the workpiece can be induction heated in a range surrounded by the first induction heating coil. The surrounding stepped part or the vicinity of the stepped part can be induction-heated. For this reason, even in the stepped portion or in the vicinity of the stepped portion, the temperature can be raised to a temperature range necessary for tempering to improve the tempering performance.

第1誘導加熱コイルと第2誘導加熱コイルとは電気的に接続されていないので、各コイルを別個に交換等することができる。このため、サイズ(大きさ)や形状の異なるワークに対して、第2誘導加熱コイルを交換することにより、このワークに形成される熱硬化層に対して最適な加熱温度で加熱することができる。したがって、条件導出の工数をソレノイドコイルに小径部位を形成する従来のものと比較して大幅に短縮できる。   Since the first induction heating coil and the second induction heating coil are not electrically connected, each coil can be exchanged separately. For this reason, by exchanging the second induction heating coil for a workpiece having a different size (size) and shape, the thermosetting layer formed on the workpiece can be heated at an optimum heating temperature. . Therefore, the man-hours for deriving the conditions can be greatly shortened compared with the conventional one in which a small diameter portion is formed in the solenoid coil.

第1誘導加熱コイル用のコイルを製造し、このコイルから第2誘導加熱コイルをワークの形状に合わせて入れ替えすることができる。このため、各コイルを低コストにて製造できる利点がある。   A coil for the first induction heating coil can be manufactured, and the second induction heating coil can be replaced from this coil in accordance with the shape of the workpiece. For this reason, there exists an advantage which can manufacture each coil at low cost.

前記第2誘導加熱コイルがその内部を冷却水が流通するものであれば、この冷却水によって、このコイルの温度上昇を抑えることができる。すなわち、第2誘導加熱コイルは、ヒステリシス損や渦電流損により発熱するため、冷却水を流すことによって、第2誘導加熱コイルの温度上昇を防止する。これによって、温度制御の安定化を図ることができ、焼戻処理性能の向上を一層図ることができる。   If cooling water flows through the second induction heating coil, the cooling water can suppress an increase in the temperature of the coil. That is, since the second induction heating coil generates heat due to hysteresis loss and eddy current loss, the temperature of the second induction heating coil is prevented by flowing cooling water. As a result, the temperature control can be stabilized and the tempering performance can be further improved.

第2誘導加熱コイルを断面矩形のパイプ材の一つのリング状体からなるものであれば、この第2誘導加熱コイルを配置する際に、載置テーブル等に安定して設置することができ、配置性に優れる。   If the second induction heating coil is made of one ring-shaped body of pipe material having a rectangular cross section, when placing the second induction heating coil, it can be stably installed on a mounting table or the like, Excellent placement.

このように、本発明では、外径面に径が異なる円筒面を有するワークにおいて、その小径部の外径面に段付部乃至段付部近傍に至る硬化層を高精度に形成することができる。このため、ワークとしては、車輪用軸受装置のハブ輪や等速自在継手の外側継手部材が最適となる。   Thus, in the present invention, in a work having cylindrical surfaces with different diameters on the outer diameter surface, a hardened layer that reaches the stepped portion or the vicinity of the stepped portion can be formed with high accuracy on the outer diameter surface of the small diameter portion. it can. For this reason, the hub wheel of the wheel bearing device and the outer joint member of the constant velocity universal joint are optimal as the workpiece.

以下本発明の実施の形態を図1〜図4に基づいて説明する。ワークとしての等速自在継手の外側継手部材(外輪)31に高周波誘導加熱焼戻を行う高周波誘導加熱焼戻装置を示している。外輪31は、内面32aにトラック溝(図示省略)が形成されたマウス部32と、このマウス部32の底壁から突設されるステム部33とからなる。ステム部33は、大径の基部33aと、基部33aに連設される中径の本体部33bと、本体部33bに連設される先端部33cとからなる。そして、熱硬化処理層Sが基部33aから先端部33cにわたって形成される。すなわち、熱硬化処理層Sは、小径部としてのステム部33の外径面に、段付部39(マウス部32の底壁から延びるステム部33の付け根部)近傍にいたる熱硬化処理層Sが形成されている。また、マウス部32の内面32aにも熱硬化処理層S1が形成される。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 shows a high-frequency induction heating and tempering device that performs high-frequency induction heating and tempering on an outer joint member (outer ring) 31 of a constant velocity universal joint as a workpiece. The outer ring 31 includes a mouth portion 32 in which a track groove (not shown) is formed on an inner surface 32a, and a stem portion 33 protruding from the bottom wall of the mouth portion 32. The stem portion 33 includes a large-diameter base portion 33a, a medium-diameter main body portion 33b connected to the base portion 33a, and a distal end portion 33c connected to the main body portion 33b. And the thermosetting process layer S is formed ranging from the base 33a to the front-end | tip part 33c. That is, the thermosetting treatment layer S is formed on the outer diameter surface of the stem portion 33 as a small diameter portion and in the vicinity of the stepped portion 39 (the root portion of the stem portion 33 extending from the bottom wall of the mouse portion 32). Is formed. Further, the thermosetting layer S <b> 1 is also formed on the inner surface 32 a of the mouse portion 32.

高周波誘導加熱焼戻装置は、外輪1全体を包囲する第1誘導加熱コイル35と、外輪1の段付部39に近接してこの段付部39を包囲する第2誘導加熱コイル38とを備える。第1誘導加熱コイル35は、導線(断面円形の導線)34をらせん状に巻いた円筒状のコイル(ソレノイドコイル)である。すなわち、第1誘導加熱コイル35はその外径及び内径がそれぞれ軸方向に沿って略同一設定される。   The high-frequency induction heating and tempering device includes a first induction heating coil 35 that surrounds the entire outer ring 1 and a second induction heating coil 38 that surrounds the stepped portion 39 of the outer ring 1 and surrounds the stepped portion 39. . The first induction heating coil 35 is a cylindrical coil (solenoid coil) in which a conducting wire (conducting wire having a circular cross section) 34 is spirally wound. That is, the outer diameter and inner diameter of the first induction heating coil 35 are set substantially the same along the axial direction.

第2誘導加熱コイル38は、図2に示すように、導電体からなる断面矩形のパイプ材40の一つのリング状体からなる。すなわち、断面矩形のパイプ材40を円形となるように配置し、端面を仕切片41を介して連結する。そして、仕切片41近傍に、冷却水流入管42および冷却水流出管43を接続する。このため、第2誘導加熱コイル38は、矢印Eのように冷却水流入管42から入った冷却水が、矢印Fのように冷却水流出管43から流出するように矢印Gのように円環状に流れる流路44が形成される。前記仕切片41は絶縁体にて構成される。これは、仕切片41を絶縁体にて構成すると、非加熱物に流れる電流は、第1誘導加熱コイル35と第2誘導加熱コイル38をながれる電流が重畳されたものとなり、仕切片41を導電体にて構成すると、非加熱物に流れる電流は、第1誘導加熱コイル35と第2誘導加熱コイル38に拠り発生する電流の向きが相殺される方向の電流となるからである。   As shown in FIG. 2, the second induction heating coil 38 is composed of one ring-shaped body of a pipe member 40 having a rectangular cross section made of a conductor. That is, the pipe member 40 having a rectangular cross section is arranged in a circular shape, and the end surfaces are connected via the partition piece 41. Then, a cooling water inflow pipe 42 and a cooling water outflow pipe 43 are connected in the vicinity of the partition piece 41. For this reason, the second induction heating coil 38 has an annular shape as indicated by an arrow G so that the cooling water entering from the cooling water inflow pipe 42 as indicated by an arrow E flows out of the cooling water outlet pipe 43 as indicated by an arrow F. A flowing channel 44 is formed. The partition piece 41 is made of an insulator. This is because if the partition piece 41 is formed of an insulator, the current flowing through the non-heated material is a superposition of the current flowing through the first induction heating coil 35 and the second induction heating coil 38, and the partition piece 41 is made conductive. This is because the current flowing in the non-heated material becomes a current in a direction in which the directions of the currents generated by the first induction heating coil 35 and the second induction heating coil 38 are offset when configured by the body.

第2誘導加熱コイル38は、絶縁材(絶縁体)からなるテーブル45に載置保持される。なお、テーブル45は、円筒体からなる本体部45aと、本体部45aの上方開口部に配置されるコイル受け台部45bとを備える。そして、コイル受け台部45b上に第2誘導加熱コイル38が載置保持される。   The second induction heating coil 38 is placed and held on a table 45 made of an insulating material (insulator). The table 45 includes a main body portion 45a made of a cylindrical body and a coil cradle portion 45b disposed in the upper opening of the main body portion 45a. And the 2nd induction heating coil 38 is mounted and hold | maintained on the coil stand 45b.

また、外輪31をそのマウス部32の開口部が下方に開口する状態として、下治具36と上治具37とで支持する。下治具36はマウス部32の開口部を塞ぐ程度の大きさの絶縁性円盤体46を備える。上治具37は外輪31のステム部33の端面47と略同一径の絶縁性円柱体48を備える。   Further, the outer ring 31 is supported by the lower jig 36 and the upper jig 37 in a state where the opening of the mouse portion 32 opens downward. The lower jig 36 includes an insulating disc body 46 having a size enough to block the opening of the mouse portion 32. The upper jig 37 includes an insulating cylindrical body 48 having substantially the same diameter as the end surface 47 of the stem portion 33 of the outer ring 31.

コイル受け台部45bの開口部50が外輪31の段付部39に対応する。このため、第2誘導加熱コイル38はステム部33の基部33aを包囲することになる。なお、第2誘導加熱コイル38の内径はステム部33の基部33aの外径よりも僅かに大きく設定され、第2誘導加熱コイル38の内周面38aが基部33aの外径面49に近接配置され、外輪31の段付部39近傍を包囲することになる。   The opening 50 of the coil cradle portion 45 b corresponds to the stepped portion 39 of the outer ring 31. For this reason, the second induction heating coil 38 surrounds the base portion 33 a of the stem portion 33. The inner diameter of the second induction heating coil 38 is set to be slightly larger than the outer diameter of the base portion 33a of the stem portion 33, and the inner peripheral surface 38a of the second induction heating coil 38 is disposed close to the outer diameter surface 49 of the base portion 33a. Thus, the vicinity of the stepped portion 39 of the outer ring 31 is surrounded.

テーブル45は、その外径が第1誘導加熱コイル35の内径よりも僅かに小さく、その内径が外輪31のマウス部32の外径よりも僅かに大きい。 The outer diameter of the table 45 is slightly smaller than the inner diameter of the first induction heating coil 35, and the inner diameter is slightly larger than the outer diameter of the mouse portion 32 of the outer ring 31.

次に前記高周波誘導加熱焼戻装置を使用した高周波誘導加熱焼戻方法を説明する。高周波誘導加熱焼戻を行う前に、このワーク(外輪31)に対して焼入れ(この高周波誘導加熱焼入れ)が行われる。この場合、この高周波誘導加熱焼戻装置を用いることができる。高周波誘導加熱焼入れを行った後、この高周波誘導加熱焼戻装置を使用した高周波誘導加熱焼戻を行う。   Next, a high frequency induction heating and tempering method using the high frequency induction heating and tempering apparatus will be described. Prior to high-frequency induction heating and tempering, the workpiece (outer ring 31) is quenched (this high-frequency induction heating and quenching). In this case, this high-frequency induction heating and tempering device can be used. After performing high frequency induction heating and quenching, high frequency induction heating and tempering using this high frequency induction heating and tempering device is performed.

この際、図1に示す状態に高周波誘導加熱焼戻装置にワーク(外輪31)をセットする。すなわち、マウス部32がテーブル45内に収納された状態の外輪31を第1誘導加熱コイル35内に収容する。また、テーブル45のコイル受け台部45bに第2誘導加熱コイル38を載置保持する。そして、外輪31と第1誘導加熱コイル35と第2誘導加熱コイル38とを同一軸心L上に配置する。この実施形態において、本発明の小径部がステム部33にて構成し、段付部39がステム部33とマウス部32との間の付け根部にて構成することになる。   At this time, the work (outer ring 31) is set in the high-frequency induction heating and tempering apparatus in the state shown in FIG. That is, the outer ring 31 in a state where the mouse part 32 is housed in the table 45 is housed in the first induction heating coil 35. Further, the second induction heating coil 38 is placed and held on the coil cradle portion 45 b of the table 45. Then, the outer ring 31, the first induction heating coil 35, and the second induction heating coil 38 are arranged on the same axis L. In this embodiment, the small diameter portion of the present invention is constituted by the stem portion 33, and the stepped portion 39 is constituted by the root portion between the stem portion 33 and the mouse portion 32.

この状態で、第1誘導加熱コイル35に高周波電流を印加する。これによって、第1誘導加熱コイル35に交流磁界が発生し、この第1誘導加熱コイル35の交流磁界によって、第2誘導加熱コイル38に誘導電圧が発生する。第2誘導加熱コイル38に誘導電圧が発生することによって、第2誘導加熱コイル38に交流電流が流れる。このため、第2誘導加熱コイル38に交流磁界が発生し、第2誘導加熱コイル38にて包囲されている段付部39乃至段付部近傍を誘導加熱することができる。   In this state, a high frequency current is applied to the first induction heating coil 35. As a result, an alternating magnetic field is generated in the first induction heating coil 35, and an induction voltage is generated in the second induction heating coil 38 by the alternating magnetic field of the first induction heating coil 35. When an induction voltage is generated in the second induction heating coil 38, an alternating current flows through the second induction heating coil 38. For this reason, an alternating magnetic field is generated in the second induction heating coil 38, and the stepped portion 39 to the vicinity of the stepped portion surrounded by the second induction heating coil 38 can be induction heated.

すなわち、第1誘導加熱コイル35に高周波電流を印加することによって、第1誘導加熱コイル35及び第1誘導加熱コイル38内に配置される第2誘導加熱コイル38にそれぞれ交流磁界が発生することになる。このように、第1誘導加熱コイル35に交流磁界が発生すれば、この第1誘導加熱コイル35に包囲されている範囲においてそのワーク外表面を誘導加熱することができ、第2誘導加熱コイル38にて包囲されている段付部39乃至段付部近傍を誘導加熱することができる。このため、段付部39乃至段付部近傍においても、焼戻しに必要な温度域に上昇させて焼戻処理性能の向上を図ることができる。すなわち、図1におけるA部、B部、C部の温度変化が図4に示すグラフのように変化し、各部位において、焼戻しに必要な温度に上昇させることができる。なお、図4において、T1とT2との間が焼戻しに必要な温度である。   That is, by applying a high-frequency current to the first induction heating coil 35, an AC magnetic field is generated in each of the first induction heating coil 35 and the second induction heating coil 38 disposed in the first induction heating coil 38. Become. Thus, if an alternating magnetic field is generated in the first induction heating coil 35, the outer surface of the workpiece can be induction heated in a range surrounded by the first induction heating coil 35, and the second induction heating coil 38. The stepped portion 39 or the vicinity of the stepped portion surrounded by can be induction-heated. For this reason, even in the stepped portion 39 to the vicinity of the stepped portion, the temperature can be raised to a temperature range necessary for tempering to improve the tempering performance. That is, the temperature change of the A part, the B part, and the C part in FIG. 1 changes as shown in the graph in FIG. 4, and the temperature can be increased to the temperature necessary for tempering in each part. In FIG. 4, a temperature between T1 and T2 is a temperature necessary for tempering.

この誘導加熱中においては、第2誘導加熱コイル38の内部を冷却水が流通させる。これによって、ヒステリシス損や渦電流損により発熱する第2誘導加熱コイル38の温度上昇を防止する。   During this induction heating, the cooling water flows through the inside of the second induction heating coil 38. This prevents the temperature rise of the second induction heating coil 38 that generates heat due to hysteresis loss and eddy current loss.

第2誘導加熱コイル38の径を大きくすれば、第1誘導加熱コイル35との間の距離(寸法)が小さくなり、第2誘導加熱コイル38に生じる誘導電圧が大きくなる。逆に第2誘導加熱コイル38の径を小さくすれば、第1誘導加熱コイル35との間の距離(寸法)が大きくなり、第2誘導加熱コイル38に生じる誘導電圧が小さくなる。このため、形成される熱硬化処理層Sの段付部乃至段付部近傍に対する温度制御を安定して行うことができる。   If the diameter of the second induction heating coil 38 is increased, the distance (dimension) from the first induction heating coil 35 is reduced, and the induction voltage generated in the second induction heating coil 38 is increased. Conversely, if the diameter of the second induction heating coil 38 is reduced, the distance (dimension) between the first induction heating coil 35 and the induction voltage generated in the second induction heating coil 38 is reduced. For this reason, the temperature control with respect to the step part of the thermosetting layer S to be formed or the vicinity of the step part can be stably performed.

第1誘導加熱コイル35と第2誘導加熱コイル38とは電気的に接続されていないので、各コイル35,38を別個に交換等することができる。このため、サイズ(大きさ)や形状の異なるワークに対して、第2誘導加熱コイル38を交換することにより、このワークの形成される熱硬化処理層Sに対して最適な加熱温度で加熱することができる。したがって、条件導出の工数を、図6や図8に示すように、ソレノイドコイル5に小径部位5a、5bを形成するものと比較して大幅に短縮できる。   Since the first induction heating coil 35 and the second induction heating coil 38 are not electrically connected, the coils 35 and 38 can be exchanged separately. For this reason, by exchanging the second induction heating coil 38 for a workpiece having a different size (size) or shape, the thermosetting layer S on which the workpiece is formed is heated at an optimum heating temperature. be able to. Therefore, the man-hours for deriving the conditions can be significantly shortened as compared with the case where the small diameter portions 5a and 5b are formed in the solenoid coil 5, as shown in FIGS.

第1誘導加熱コイル用のコイルを製造し、このコイルから第2誘導加熱コイル38をワークの形状に合わせて入れ替えすることができる。このため、各コイルを低コストにて製造できる利点がある。   The coil for 1st induction heating coils can be manufactured, and the 2nd induction heating coil 38 can be replaced | exchanged according to the shape of a workpiece | work from this coil. For this reason, there exists an advantage which can manufacture each coil at low cost.

第2誘導加熱コイル38がその内部を冷却水が流通するものであれば、この冷却水によって、このコイルの温度上昇を抑えることができる。これによって、温度制御の安定化を図ることができ、焼戻処理性能の向上を一層図ることができる。   If the second induction heating coil 38 has cooling water flowing therethrough, this cooling water can suppress the temperature rise of the coil. As a result, the temperature control can be stabilized and the tempering performance can be further improved.

第2誘導加熱コイル38は断面矩形のパイプ材の一つのリング状体からなるので、第2誘導加熱コイル38を配置する際に、この実施形態のようにテーブル(載置テーブル)45等に安定して設置することができ、配置性に優れる。   Since the second induction heating coil 38 is composed of a ring-shaped body of pipe material having a rectangular cross section, when the second induction heating coil 38 is disposed, the second induction heating coil 38 is stable to the table (mounting table) 45 or the like as in this embodiment. It can be installed and has excellent layout.

次に、図3はワークが車輪用軸受装置のハブ輪60の場合を示している。ハブ輪60は、軸部61と、この軸部61の一端側において外径側へと突出するフランジ部62とを備える。軸部61の外表面に熱硬化処理層S2が形成される。すなわち、熱硬化処理層S2は、小径部としての軸部61の外径面に、段付部(フランジ部62から延びる軸部61の付け根部64)近傍にいたる熱硬化処理層S2が形成されている。なお、軸部61のフランジ部62側端面にはホイールおよびブレーキロータが装着される短筒状のパイロット部63が突設されている。   Next, FIG. 3 shows a case where the workpiece is a hub wheel 60 of a wheel bearing device. The hub wheel 60 includes a shaft portion 61 and a flange portion 62 that protrudes toward the outer diameter side at one end side of the shaft portion 61. A thermosetting layer S <b> 2 is formed on the outer surface of the shaft portion 61. That is, the thermosetting layer S2 is formed on the outer diameter surface of the shaft portion 61 as a small-diameter portion, near the stepped portion (the base portion 64 of the shaft portion 61 extending from the flange portion 62). ing. A short cylindrical pilot portion 63 to which a wheel and a brake rotor are mounted projects from the end surface of the shaft portion 61 on the flange portion 62 side.

軸部61は、フランジ部62側のボス部61aと、ボス部61aに連設される小径の本体部61bとを備える。ボス部61aは、大径部65と中径部66と小径部67とを有し、小径部67と本体部61bとの間に段差68が設けられている。そして、ボス部61aから本体部61bにわたって熱硬化処理層S2が形成されている。なお、ボス部61aの中径部66は、軸受装置の転動体(ボール)70の転走面(転走溝)を構成する。   The shaft portion 61 includes a boss portion 61a on the flange portion 62 side, and a small-diameter main body portion 61b provided continuously to the boss portion 61a. The boss portion 61a has a large diameter portion 65, a medium diameter portion 66, and a small diameter portion 67, and a step 68 is provided between the small diameter portion 67 and the main body portion 61b. And thermosetting process layer S2 is formed from the boss | hub part 61a to the main-body part 61b. In addition, the medium diameter part 66 of the boss | hub part 61a comprises the rolling surface (rolling groove) of the rolling element (ball) 70 of a bearing apparatus.

この場合もハブ輪60はそのパイロット部63の開口部が下方に開口する状態として、下治具6と上治具7とで支持する。この状態で、第2誘導加熱コイル88にて段付部64乃至段付部近傍を包囲する。すなわち、この実施形態において、本発明の小径部が、本体部61bとボス部61aの小径部67とで構成し、段付部64がボス部61aの中径部66にて構成することになる。   Also in this case, the hub wheel 60 is supported by the lower jig 6 and the upper jig 7 with the opening of the pilot portion 63 opened downward. In this state, the stepped portion 64 or the vicinity of the stepped portion is surrounded by the second induction heating coil 88. That is, in this embodiment, the small diameter portion of the present invention is constituted by the main body portion 61b and the small diameter portion 67 of the boss portion 61a, and the stepped portion 64 is constituted by the medium diameter portion 66 of the boss portion 61a. .

第1誘導加熱コイル85は、前記図1に示す第1誘導加熱コイル35と同様の導線(断面円形の導線)84をらせん状に巻いた円筒状のコイル(ソレノイドコイル)である。すなわち、第1誘導加熱コイル85はその外径及び内径がそれぞれ軸方向に沿って略同一設定される。   The first induction heating coil 85 is a cylindrical coil (solenoid coil) in which a conducting wire (conducting wire having a circular cross section) 84 similar to the first induction heating coil 35 shown in FIG. 1 is spirally wound. That is, the outer diameter and inner diameter of the first induction heating coil 85 are set substantially the same along the axial direction.

第2誘導加熱コイル88は、図2に示すように、断面矩形のパイプ材90の一つのリング状体からなり、冷却水流入管(図示省略)から入った冷却水が、冷却水流出管から流出するように円環状に流れる流路94が形成される。   As shown in FIG. 2, the second induction heating coil 88 is formed of one ring-shaped body of a pipe member 90 having a rectangular cross section, and cooling water entering from a cooling water inflow pipe (not shown) flows out from the cooling water outflow pipe. Thus, a flow path 94 that flows in an annular shape is formed.

この際、第2誘導加熱コイル88は絶縁材(絶縁物)からなるテーブル71に載置保持される。この場合のテーブル71は、ハブ輪60の上方位置に配置される水平台71aの載置部72に第2誘導加熱コイル88が載置される。すなわち、水平台71aは、ハブ輪60のボス部61aが挿通される孔部を有し、この孔部の周縁部に厚肉部から載置部72を有する。   At this time, the second induction heating coil 88 is placed and held on a table 71 made of an insulating material (insulator). In the table 71 in this case, the second induction heating coil 88 is placed on the placement portion 72 of the horizontal base 71 a disposed above the hub wheel 60. That is, the horizontal base 71a has a hole portion through which the boss portion 61a of the hub wheel 60 is inserted, and has a mounting portion 72 from the thick portion to the peripheral portion of the hole portion.

テーブル71には第1誘導加熱コイル85が載置保持される。すなわち、第1誘導加熱コイル85の内径が載置部72より僅かに大きく設定され、第2誘導加熱コイル88の外径が第1誘導加熱コイル85の内径よりも小さく設定され、さらに第2誘導加熱コイル88の内径がボス部61aの中径部66よりも僅かに大きく設定される。なお、下治具86はパイロット部63の開口部を塞ぐ程度の大きさの絶縁性円盤体76を備える。上治具87は軸部61の端面77と略同一径の絶縁性円柱体78を備える。   A first induction heating coil 85 is placed and held on the table 71. That is, the inner diameter of the first induction heating coil 85 is set slightly larger than the mounting portion 72, the outer diameter of the second induction heating coil 88 is set smaller than the inner diameter of the first induction heating coil 85, and further the second induction The inner diameter of the heating coil 88 is set slightly larger than the middle diameter portion 66 of the boss portion 61a. The lower jig 86 includes an insulating disc 76 having a size enough to block the opening of the pilot portion 63. The upper jig 87 includes an insulating cylindrical body 78 having substantially the same diameter as the end surface 77 of the shaft portion 61.

この場合も、図3に示した状態にセット(ハブ輪60と、第1誘導加熱コイル85と、第2誘導加熱コイル88とが同一軸心L1上に配設される状態)して、第1誘導加熱コイル85に高周波電流を印加する。これによって、前記図1に示す高周波誘導加熱焼戻装置と同様、第1誘導加熱コイル85及び第1誘導加熱コイル85内に配置される第2誘導加熱コイル88にそれぞれ交流磁界が発生することになる。このように、第1誘導加熱コイル85に交流磁界が発生すれば、この第1誘導加熱コイル85に包囲されている範囲においてそのワーク外表面を誘導加熱することができ、第2誘導加熱コイル88にて包囲されている段付部64乃至段付部近傍を誘導加熱することができる。   Also in this case, the state shown in FIG. 3 is set (the hub wheel 60, the first induction heating coil 85, and the second induction heating coil 88 are disposed on the same axis L1). A high frequency current is applied to the one induction heating coil 85. As a result, an AC magnetic field is generated in each of the first induction heating coil 85 and the second induction heating coil 88 disposed in the first induction heating coil 85, as in the high-frequency induction heating tempering apparatus shown in FIG. Become. Thus, if an alternating magnetic field is generated in the first induction heating coil 85, the outer surface of the workpiece can be induction heated in a range surrounded by the first induction heating coil 85, and the second induction heating coil 88. The stepped portion 64 or the vicinity of the stepped portion surrounded by can be induction-heated.

このため、この図3に示す高周波誘導加熱焼戻装置は、図3におけるA1部、B1部、C1部の温度変化が図4に示すグラフのように変化し、各部位において、焼戻しに必要な温度に上昇させることができる。すなわち、図3に示す高周波誘導加熱焼戻装置は、前記図1に示す高周波誘導加熱焼戻装置と同様の作用効果を奏することができる。   For this reason, in the high frequency induction heating and tempering apparatus shown in FIG. 3, the temperature changes of the A1, B1 and C1 parts in FIG. 3 change as shown in the graph of FIG. 4, and each part is necessary for tempering. Can be raised to temperature. That is, the high frequency induction heating and tempering apparatus shown in FIG. 3 can achieve the same effects as the high frequency induction heating and tempering apparatus shown in FIG.

このように、本発明では、外径面に径が異なる円筒面を有するワークにおいて、その小径部の外径面に段付部乃至段付部近傍に至る硬化層を高精度に形成することができる。このため、ワークとしては、車輪用軸受装置のハブ輪や等速自在継手の外側継手部材が最適となる。   Thus, in the present invention, in a work having cylindrical surfaces with different diameters on the outer diameter surface, a hardened layer that reaches the stepped portion or the vicinity of the stepped portion can be formed with high accuracy on the outer diameter surface of the small diameter portion. it can. For this reason, the hub wheel of the wheel bearing device and the outer joint member of the constant velocity universal joint are optimal as the workpiece.

以上、本発明の実施形態につき説明したが、本発明は前記実施形態に限定されることなく種々の変形が可能であって、例えば、第1誘導加熱コイル35、85の巻き数、巻きピッチ、径寸法、導線の径寸法とは、ワークの大きさや形状等に応じて種々変更できる。また、第1誘導加熱コイル35、85においても、使用する導線を中空状として、冷却水が流れるようにしてもよい。第2誘導加熱コイル38、88としては、使用するパイプ材が円筒体であってもよく、第1誘導加熱コイル35、85のようにらせん状に巻いた円筒状のコイルであってもよい。また、第2誘導加熱コイル38、88として、冷却水が流れない中実体にて構成してもよく、この場合の断面形状も矩形状であっても円形であってもよい。第1誘導加熱コイル35,85及び第2誘導加熱コイル38、88の材質としては、高周波電流が流れて交流磁界を発生させるものであればよいので、従来から高周波熱誘導装置に用いられる種々のものを使用することができる。また、ワークとしては、車輪用軸受装置のハブ輪や等速自在継手の外側継手部材に限るものではなく、外径面に径が異なる円筒面を有する種々のワークを用いることができる。   As mentioned above, although it demonstrated per embodiment of this invention, this invention is not limited to the said embodiment, A various deformation | transformation is possible, for example, the number of turns of the 1st induction heating coils 35 and 85, winding pitch, The diameter dimension and the diameter dimension of the conducting wire can be variously changed according to the size and shape of the workpiece. Moreover, in the 1st induction heating coils 35 and 85, the conducting wire to be used may be hollow and the cooling water may flow. As the 2nd induction heating coils 38 and 88, the pipe material to be used may be a cylindrical body, and may be the cylindrical coil wound helically like the 1st induction heating coils 35 and 85. Further, the second induction heating coils 38 and 88 may be configured by a solid body through which cooling water does not flow, and the cross-sectional shape in this case may be rectangular or circular. As materials for the first induction heating coils 35 and 85 and the second induction heating coils 38 and 88, any material can be used as long as a high-frequency current flows and an alternating magnetic field is generated. Things can be used. Further, the workpiece is not limited to the hub wheel of the wheel bearing device or the outer joint member of the constant velocity universal joint, and various workpieces having cylindrical surfaces with different diameters on the outer diameter surface can be used.

本発明の実施形態を示す高周波熱誘導加熱装置の簡略断面図である。It is a simplified sectional view of a high frequency heat induction heating device showing an embodiment of the present invention. 前記高周波熱誘導加熱装置の第2誘導加熱コイルを示し、(a)は平面図であり、(b)は側面図である。The 2nd induction heating coil of the said high frequency heat induction heating apparatus is shown, (a) is a top view, (b) is a side view. 本発明の実施形態を示す他の高周波熱誘導加熱装置の簡略断面図である。It is a simplified sectional view of other high-frequency heat induction heating devices showing an embodiment of the present invention. 加熱時間と加熱温度との関係を示すグラフ図である。It is a graph which shows the relationship between heating time and heating temperature. 従来の高周波熱誘導加熱装置の簡略断面図である。It is a simplified sectional view of a conventional high-frequency heat induction heating device. 前記図5の高周波熱誘導加熱装置の変形例を示す簡略断面図である。FIG. 6 is a simplified cross-sectional view showing a modification of the high-frequency heat induction heating device of FIG. 5. 従来の他の高周波熱誘導加熱装置の簡略断面図である。It is a simplified sectional view of another conventional high frequency heat induction heating device. 前記図7の高周波熱誘導加熱装置の変形例を示す簡略断面図である。FIG. 8 is a simplified cross-sectional view showing a modification of the high-frequency heat induction heating device of FIG. 7. 加熱時間と加熱温度との関係を示すグラフ図である。It is a graph which shows the relationship between heating time and heating temperature. 加熱時間と加熱温度との関係を示すグラフ図である。It is a graph which shows the relationship between heating time and heating temperature.

符号の説明Explanation of symbols

S 熱硬化処理層
31 外側継手部材
35 第1誘導加熱コイル
38 第2誘導加熱コイル
39 段付部
40 パイプ材
60 ハブ輪
64 段付部
85 第1誘導加熱コイル
88 第2誘導加熱コイル
S Thermosetting layer 31 Outer joint member 35 First induction heating coil 38 Second induction heating coil 39 Stepped portion 40 Pipe material 60 Hub wheel 64 Stepped portion 85 First induction heating coil 88 Second induction heating coil

Claims (6)

外径面に径が異なる円筒面を有するワークにおいて、その小径部の外径面に大径部との間の段付部乃至段付部近傍に至る部分に形成した硬化層を焼戻するための高周波誘導加熱焼戻装置であって、硬化層が形成される小径部の少なくとも全体を包囲する第1誘導加熱コイルと、段付部に近接してこの段付部を包囲する第2誘導加熱コイルとを備え、第1誘導加熱コイルはその外径及び内径がそれぞれ軸方向に沿って略同一設定されるとともに、第1誘導加熱コイルと第2誘導加熱コイルとが電気的に非接触とされ、第1誘導加熱コイルへの高周波電流の印加にて第2誘導加熱コイルに交流磁界を発生させることを特徴とする高周波誘導加熱焼戻装置。   To temper the hardened layer formed on the outer diameter surface of the small diameter portion on the outer diameter surface of the outer diameter surface, or the stepped portion between the large diameter portion and the portion near the stepped portion. The first induction heating coil that surrounds at least the entire small-diameter portion where the hardened layer is formed, and the second induction heating that surrounds the stepped portion in the vicinity of the stepped portion. The first induction heating coil has an outer diameter and an inner diameter that are set substantially the same along the axial direction, and the first induction heating coil and the second induction heating coil are not in electrical contact with each other. A high-frequency induction heating and tempering apparatus that generates an alternating magnetic field in the second induction heating coil by applying a high-frequency current to the first induction heating coil. 前記第2誘導加熱コイルは、その内部を冷却水が流通することを特徴とする請求項1に記載の高周波誘導加熱焼戻装置。   The high frequency induction heating and tempering apparatus according to claim 1, wherein cooling water flows through the second induction heating coil. 前記第2誘導加熱コイルは、断面矩形のパイプ材の一つのリング状体からなることを特徴とする請求項1又は請求項2に記載の高周波誘導加熱焼戻装置。   The high frequency induction heating and tempering apparatus according to claim 1 or 2, wherein the second induction heating coil is formed of one ring-shaped body of a pipe member having a rectangular cross section. 前記ワークは、車輪用軸受装置のハブ輪であることを特徴とする請求項1〜請求項3のいずれかに記載の高周波誘導加熱焼戻装置。   The high frequency induction heating and tempering device according to any one of claims 1 to 3, wherein the workpiece is a hub wheel of a wheel bearing device. 前記ワークは、等速自在継手の外側継手部材であることを特徴とする請求項1〜請求項3のいずれかに記載の高周波誘導加熱焼戻装置。   The high-frequency induction heating and tempering device according to claim 1, wherein the workpiece is an outer joint member of a constant velocity universal joint. 外径面に径が異なる円筒面を有するワークにおいて、その小径部の外径面に大径部との間の段付部乃至段付部近傍に至る部分に形成した硬化層を焼戻するための高周波誘導加熱焼戻方法であって、前記小径部を包囲する第1誘導加熱コイルに高周波電流を印加して、この第1誘導加熱コイルに交流磁界を発生させ、これによって、段付部乃至段付部近傍を包囲する第2誘導加熱コイルに交流電流を流して、この第2誘導加熱コイルに交流磁界を発生させることを特徴とする高周波誘導加熱焼戻方法。   To temper the hardened layer formed on the outer diameter surface of the small diameter portion on the outer diameter surface of the outer diameter surface, or the stepped portion between the large diameter portion and the portion near the stepped portion. A high-frequency induction heating and tempering method according to claim 1, wherein a high-frequency current is applied to a first induction heating coil surrounding the small diameter portion to generate an alternating magnetic field in the first induction heating coil. A high-frequency induction heating and tempering method, wherein an alternating current is passed through a second induction heating coil surrounding a stepped portion and an alternating magnetic field is generated in the second induction heating coil.
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JP2015060634A (en) * 2013-09-17 2015-03-30 高周波熱錬株式会社 Induction heating coil and induction heating apparatus and heating method
CN105557066A (en) * 2013-09-17 2016-05-04 高周波热錬株式会社 A gasket for a heat-charged cavity of an appliance with microwave heating function
US20160234885A1 (en) * 2013-09-17 2016-08-11 Neturen Co., Ltd. Induction heating coil, induction heating device, and heating method
US10285221B2 (en) 2013-09-17 2019-05-07 Neturen Co., Ltd. Induction heating coil, induction heating device, and heating method
CN111575448A (en) * 2020-06-16 2020-08-25 刘胜 Processing method of shaft
CN111575448B (en) * 2020-06-16 2021-10-22 广西汇恒机械制造有限公司 Processing method of shaft

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