JP5496478B2 - High frequency induction heating tempering apparatus and high frequency induction heating tempering method - Google Patents

High frequency induction heating tempering apparatus and high frequency induction heating tempering method Download PDF

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JP5496478B2
JP5496478B2 JP2008192427A JP2008192427A JP5496478B2 JP 5496478 B2 JP5496478 B2 JP 5496478B2 JP 2008192427 A JP2008192427 A JP 2008192427A JP 2008192427 A JP2008192427 A JP 2008192427A JP 5496478 B2 JP5496478 B2 JP 5496478B2
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induction heating
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heating coil
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frequency
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JP2010031305A (en
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慎太郎 鈴木
健晃 石代
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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

本発明は、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熱硬化処理層を形成するための高周波誘導加熱焼戻装置及び高周波誘導加熱焼戻方法に関する。   The present invention relates to a high-frequency induction heating and tempering apparatus and a high-frequency induction heating and tempering method for forming a thermosetting layer on a work having cylindrical surfaces having different diameters on the outer diameter surface of an outer joint member or the like 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としては、図７に示すような等速自在継手の外側継手部材（外輪）１がある。外輪１には、小径部の外径面及び大径部の内径面に熱硬化処理層が形成されることになる。熱硬化処理層は、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、水中または油中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 work having cylindrical surfaces with different diameters on the outer diameter surface, there is an outer joint member (outer ring) 1 of a constant velocity universal joint as shown in FIG. In the outer ring 1, a thermosetting layer is formed on the outer diameter surface of the small diameter portion and the inner diameter surface of the large diameter portion. The thermosetting layer is formed by performing 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 in 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７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。   The outer ring 1 shown in FIG. 7 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及び特許文献２）。高周波誘導加熱焼戻装置としては、図７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 and Patent Document 2). As a high-frequency induction heating and tempering device, a round solenoid coil 5 as shown in FIG. 7 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.

この場合、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。   In this case, by causing a high frequency current to flow 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 by the resistance of the outer ring 1 due to this current. 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.

図７に示すような外輪１では、ステム部３およびマウス部２に熱硬化処理層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７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、外輪１は、下センター治具６と上センター治具７とで支えられて、ソレノイドコイル５に高周波電流を流すことで外輪１を誘導加熱する。ソレノイドコイル５に流す電流の大きさ、周波数は、外輪１により様々な値となる。誘導加熱により外輪１を所定温度まで上昇したところで加熱を止め、一定時間保持した後、冷却水で冷却して焼戻しが完了する。   In the outer ring 1 as shown in FIG. 7, since it is necessary to form the thermosetting 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. 7, a work (outer ring) is placed inside the solenoid coil 5 to heat the entire outer ring. In this case, the outer ring 1 is supported by the lower center jig 6 and the upper center jig 7, and the outer ring 1 is induction-heated by flowing a high-frequency current through the solenoid coil 5. The magnitude and frequency of the current flowing through the solenoid coil 5 vary depending on the outer ring 1. When the outer ring 1 is raised to a predetermined temperature by induction heating, the heating is stopped and held for a predetermined time, and then cooled with cooling water to complete the tempering.

外輪１では、ステム部３とマウス部２とを焼入れするため、この両方の部位を焼戻しする必要がある。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８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８において、グラフＡは図７におけるＡ部の温度変化であり、グラフＢは図７におけるＢ部の温度変化であり、グラフＣは図７におけるＣ部の温度変化である。   In the outer ring 1, since the stem portion 3 and the mouse portion 2 are quenched, it is necessary to temper both portions. 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. 8, there exists a problem which does not raise to the temperature range required for tempering. In FIG. 8, a graph A is a temperature change in the A portion in FIG. 7, a graph B is a temperature change in the B portion in FIG. 7, and a graph C is a temperature change in the C portion in FIG.

また、マウス部２の反開口部側１０ではステム部３とマウス部２との結合部側に熱拡散で熱量が奪われ、マウス部２の開口部側１２では下治具６側に熱拡散で熱量が奪われる。これにより、マウス部２の反開口部側１０と開口部側１２とでは、軸方向中間部１１と比較して温度が上がり難い。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Ｄは図７におけるＤ部の温度変化であり、グラフＥは図７におけるＥ部の温度変化であり、グラフＦは図７におけるＦ部の温度変化である。
特開昭６４−４７８１０号公報 特開昭６４−８７７２１号公報 Further, on the side 10 opposite to the mouth portion 2 of the mouse portion 2, the amount of heat is removed by heat diffusion to the joint portion side between the stem portion 3 and the mouse portion 2, and on the opening portion side 12 of the mouse portion 2, heat is diffused to the lower jig 6 side. The heat is lost. As a result, the temperature on the opposite opening side 10 and the opening side 12 of the mouse part 2 is less likely to rise compared to the axial direction intermediate part 11. 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, a graph D is a temperature change in the D portion in FIG. 7, a graph E is a temperature change in the E portion in FIG. 7, and a graph F is a temperature change in the F portion in FIG. 7.
JP-A-64-47810 JP-A 64-87721

そこで、外輪１においては、図１０に示すように、ステム部３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５ｂを形成する。すなわち、エリア（４）に対応する部位のソレノイドコイル５ｂの径を、エリア（５）に対応する部位のソレノイドコイル５ａの径よりも小さくしている。これにより、エリア（４）におけるソレノイドコイル５ｂと外輪１との隙間を小さくすることができて、この部位の加熱効率を上げることができる。この場合、図１０におけるＡ部、Ｂ部、Ｃ部の温度変化が図１１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１１において、Ｔ１とＴ２との間が焼戻しに必要な温度である。   Therefore, in the outer ring 1, as shown in FIG. 10, a small-diameter portion 5 b 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 3. That is, the diameter of the solenoid coil 5b corresponding to the area (4) is smaller than the diameter of the solenoid coil 5a corresponding to the area (5). Thereby, the clearance gap between the solenoid coil 5b and the outer ring | wheel 1 in an area (4) can be made small, and the heating efficiency of this site | part can be raised. In this case, the temperature changes in the A part, the B part, and the C part in FIG. 10 change as shown in the graph in FIG. In this way, the temperature can be raised to the temperature required for tempering at each part. In FIG. 11, a temperature between T1 and T2 is a temperature necessary for tempering.

また、マウス部２では、温度の上がり難い反開口部側１０及び開口部側１２に対応するソレノイドコイル５ｃ、５ｅのコイル間隔を小さくしている。すなわち、エリア（３）及びエリア（１）に対応する部位のソレノイドコイル５ｃ、５ｅの間隔を、エリア（２）に対応する部位のソレノイドコイル５ｄの間隔よりも小さくしている。これにより、エリア（１）及びエリア（３）における磁束密度を高めて、この部位の加熱効率を上げることができる。すなわち、図１０におけるＤ部、Ｅ部、Ｆ部の温度変化が図１２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１２において、Ｔ１とＴ２との間が焼戻しに必要な温度である。   Moreover, in the mouse | mouth part 2, the coil space | interval of the solenoid coils 5c and 5e corresponding to the non-opening part side 10 and the opening part side 12 with which temperature does not rise easily is made small. That is, the interval between the solenoid coils 5c and 5e corresponding to the area (3) and the area (1) is made smaller than the interval between the solenoid coils 5d corresponding to the area (2). Thereby, the magnetic flux density in area (1) and area (3) can be raised, and the heating efficiency of this part can be raised. That is, the temperature change of the D part, the E part, and the F part in FIG. 10 changes as in the graph shown in FIG. In this way, the temperature can be raised to the temperature required for tempering at each part. In FIG. 12, a temperature between T1 and T2 is a temperature necessary for tempering.

しかしながら、ソレノイドコイル５の径や間隔は、図１０に示すように各エリア（１）〜（５）（図１０では、５つのエリアに分割しているが、外輪形状によりさらに細かいエリアに分割する場合がある）ごとの温度バランスを考慮する必要があり、過去の経験に基づいて決定するが、最適な加熱温度を得ることは困難であった。   However, the diameter and interval of the solenoid coil 5 are divided into areas (1) to (5) as shown in FIG. 10 (in FIG. 10, it is divided into five areas. However, it is difficult to obtain the optimum heating temperature, although it is determined based on past experience.

また、図１０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、最適な加熱温度が得られず、ソレノイドコイル５の径を変更する場合は、ソレノイドコイル５自体を修理する必要があり、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。   Further, when the solenoid coil 5 as shown in FIG. 10 is formed, the small-diameter portion 5b and the other portion are separately manufactured, and these are joined by brazing or the like, for example. For this reason, when the optimum heating temperature cannot be obtained and the diameter of the solenoid coil 5 is changed, it is necessary to repair the solenoid coil 5 itself, which has a great number of manufacturing steps, inferior workability, and high cost. It becomes. 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処理層全体に対して、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及び高周波誘導加熱焼戻方法を提供する。   In view of the above-mentioned problems, the present invention increases the temperature range required for tempering to the entire thermosetting layer to be formed of a workpiece having cylindrical surfaces with different diameters on the outer diameter surface. A high-frequency induction heating and tempering apparatus and a high-frequency induction heating and tempering method that can be improved are provided.

本発明の高周波誘導加熱焼戻装置は、ワークを高周波誘導加熱する高周波誘導加熱焼戻装置であって、ワーク熱処理部の軸方向長さよりも短い軸方向長さの誘導加熱コイルと、この誘導加熱コイルをワーク熱処理部の軸方向に沿って移動させる移動手段と、前記誘導加熱コイルに高周波電流を印加する高周波電源と、前記高周波電源の電流印加量を制御する制御手段とを備え、前記ワークは、加熱上昇率小部と加熱上昇率大部とを有し、加熱上昇率小部と加熱上昇率大部とで、前記誘導加熱コイルの移動速度と、前記制御手段による電流印加量の少なくとも一方を変化させるものである。 The high-frequency induction heating and tempering apparatus according to the present invention is a high-frequency induction heating and tempering apparatus that performs high-frequency induction heating of a workpiece, the induction heating coil having an axial length shorter than the axial length of the workpiece heat treatment portion, and the induction heating moving means for moving the coil in the axial direction of the workpiece heat treatment unit, and a high frequency power source for applying a high-frequency current to the induction heating coil, and a control means for controlling the current applied amount of the high frequency power source, said workpiece A heating increase rate small portion and a heating increase rate large portion, and at least one of the moving speed of the induction heating coil and the amount of current applied by the control means in the heating increase rate small portion and the heating increase rate large portion. Is something that changes .

本発明の高周波誘導加熱焼戻装置によれば、誘導加熱コイルと、高周波電源と、制御手段とを備えたものであるので、ワークの形状や大きさに応じた加熱出力や周波数で加熱することができる。また、移動手段を備えたものであるので、誘導加熱コイルは軸方向に移動・停止しながらワークを加熱することができる。このため、高周波電源の加熱出力を調節したり、誘導加熱コイルの移動速度を調節したりすることにより投入電力量を調節することができる。すなわち、温度が上がりやすい部位では、高周波電源の加熱出力を小さくするか、誘導加熱コイルの移動速度を早くすることで投入電力量を小さくすることができる。反対に、温度が上がり難い部位では、誘導加熱コイルの移動速度を遅くするか、高周波電源の加熱出力を大きくすることで投入電力量を大きくすることができる。前記ワークは、加熱上昇率小部と加熱上昇率大部とを有し、加熱上昇率小部と加熱上昇率大部とで前記誘導加熱コイルの移動速度を変化させることができる。また、前記ワークは、加熱上昇率小部と加熱上昇率大部とを有し、加熱上昇率小部と加熱上昇率大部とで前記制御手段にて電流印加量を変化させることもできる。これにより、投入電力量を調節できる。加熱上昇率大部とは、条件出しテスト（製品温度を熱電対等で測定し、加熱条件を決定するテスト）の測定に基づいて、温度が上がりやすい箇所をいい、加熱上昇率小部とは、条件出しテストに基づいて温度が上がりにくい箇所をいう。 According to the high frequency induction heating and tempering apparatus of the present invention, since the induction heating coil, the high frequency power source, and the control means are provided, heating is performed at a heating output and frequency according to the shape and size of the workpiece. Can do. Further, since the moving means is provided, the induction heating coil can heat the workpiece while moving and stopping in the axial direction. For this reason, the input electric energy can be adjusted by adjusting the heating output of the high-frequency power source or adjusting the moving speed of the induction heating coil. That is, in a portion where the temperature is likely to rise, the amount of input power can be reduced by reducing the heating output of the high-frequency power source or increasing the moving speed of the induction heating coil. On the other hand, in a region where the temperature is difficult to rise, the input power amount can be increased by slowing the moving speed of the induction heating coil or increasing the heating output of the high frequency power source. The workpiece has a small heating increase rate and a large heating increase rate, and the moving speed of the induction heating coil can be changed between the small heating increase rate and the large heating increase rate. Moreover, the said workpiece | work has a heating increase rate small part and a heating increase rate large part, and can also change an electric current application amount with the said control means by a heating increase rate small part and a heating increase rate large part. Thereby, the input electric energy can be adjusted. The heating increase rate large part means the part where the temperature is likely to rise based on the measurement of the condition setting test (the product temperature is measured with a thermocouple, etc., and the heating condition is determined). A point where the temperature is difficult to rise based on a condition test.

前記誘導加熱コイルがワークに外嵌されてワークの外径面を加熱することができる。また、前記ワークは筒部を有し、前記誘導加熱コイルが筒部に内嵌されて筒部の内径面を加熱することもできる。   The induction heating coil can be externally fitted to the workpiece to heat the outer diameter surface of the workpiece. Moreover, the said workpiece | work has a cylinder part and the said induction heating coil can also be fitted in a cylinder part and can heat the internal-diameter surface of a cylinder part.

前記ワークはカップ状部と、前記カップ状部の底部から軸方向に一体的に延びる軸部とを有し、前記誘導加熱コイルは、軸部に外嵌される軸部用誘導加熱コイルと、カップ状部に内嵌又は外嵌されるカップ状部用誘導加熱コイルとを備えるものである。   The workpiece has a cup-shaped portion and a shaft portion that extends integrally in the axial direction from the bottom of the cup-shaped portion, and the induction heating coil includes an induction heating coil for a shaft portion that is externally fitted to the shaft portion; And an induction heating coil for a cup-shaped part that is internally or externally fitted to the cup-shaped part.

軸部を加熱する軸部用誘導加熱コイルと、カップ状部を加熱するカップ状部用誘導加熱コイルとを設けて、電気的に非接触としている。このため、軸部とカップ状部とを異なる出力で加熱することができ、更に、軸部用誘導加熱コイルと、カップ状部用誘導加熱コイルとを独立して移動させながら加熱することができて、投入電力量を調節することができる。また、軸部とカップ状部を異なる周波数で加熱することができ、ワークに流れる誘導電流の浸透深さを軸部とカップ状部とでかえることができる。   An induction heating coil for the shaft portion that heats the shaft portion and an induction heating coil for the cup shape portion that heats the cup-shaped portion are provided to be electrically non-contact. Therefore, the shaft part and the cup-shaped part can be heated with different outputs, and further, the shaft part induction heating coil and the cup-shaped part induction heating coil can be heated while being moved independently. Thus, the input power amount can be adjusted. Further, the shaft portion and the cup-shaped portion can be heated at different frequencies, and the penetration depth of the induced current flowing through the workpiece can be changed between the shaft portion and the cup-shaped portion.

前記ワークは、等速自在継手の外側継手部材とすることができる。   The workpiece may be 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、ワークを高周波誘導加熱する高周波誘導加熱焼戻方法であって、ワーク熱処理部の軸方向長さよりも短い軸方向長さの誘導加熱コイルを、ワーク熱処理部の軸方向に沿って移動させつつ、前記誘導加熱コイルへの高周波電流の印加量を制御するもので、ワークにおける加熱上昇率小部での前記誘導加熱コイルの移動速度を、加熱上昇率大部でのコイル移動速度よりも遅くする制御と、ワークにおける加熱上昇率小部での加熱出力を、加熱上昇率大部での加熱出力よりも大きくする制御の少なくとも一方を行うものである。 The high-frequency induction heating and tempering method of the present invention is a high-frequency induction heating and tempering method for induction-heating a workpiece, wherein an induction heating coil having an axial length shorter than the axial length of the workpiece heat-treatment portion is used as a workpiece heat-treatment portion. while moving along the axial direction, and controls the application amount of the high-frequency current to the induction heating coil, a moving speed of the induction heating coil in the heating rate of increase small part in the work, the heating rate of increase most At least one of the control for making the heating speed slower than the coil moving speed in the above and the control for making the heating output at the small heating increase rate part of the workpiece larger than the heating output at the large heating increase rate part is performed .

本発明の高周波誘導加熱焼戻方法によれば、誘導加熱コイルを、ワーク熱処理部の軸方向に沿って移動させるものであるため、誘導加熱コイルの移動速度を調節することができる。また、前記誘導加熱コイルに、電流印加量を制御しつつ高周波電流高周波電源の加熱出力を調節することにより投入電力量を調節することができる。ワークにおける加熱上昇率小部での前記誘導加熱コイルの移動速度を、加熱上昇率大部でのコイル移動速度よりも遅くすることや、ワークにおける加熱上昇率小部での加熱出力を、加熱上昇率大部での加熱出力よりも大きくすることができる。 According to the high-frequency induction heating and tempering method of the present invention, the induction heating coil is moved along the axial direction of the workpiece heat treatment portion, so that the moving speed of the induction heating coil can be adjusted. In addition, the amount of input power can be adjusted by adjusting the heating output of the high-frequency current high-frequency power supply while controlling the amount of current applied to the induction heating coil. The moving speed of the induction heating coil at the small heating increase rate in the workpiece is set slower than the coil moving speed at the large heating increase rate, or the heating output at the small heating increase rate of the workpiece is increased by heating. It can be made larger than the heating output at the large part.

カップ状部と、前記カップ状部の底部から軸方向に一体的に延びる軸部とを有するワークに対して、その軸部の外径面及びカップ状部の内径面に熱硬化処理層を形成する高周波誘導加熱焼戻方法であって、カップ状部の熱処理部の軸方向長さよりも短い軸方向長さのカップ状部用誘導加熱コイルを、カップ状部に対して外嵌又は内嵌してカップ状部用誘導加熱コイルをカップ状部の軸方向に沿って移動させつつ、コイルに高周波電流を印加する工程と、軸部の熱処理部の軸方向長さよりも短い軸方向長さの軸部用誘導加熱コイルを、軸部に対して外嵌して軸部用誘導加熱コイルを軸部の軸方向に沿って移動させつつ、コイルに高周波電流を印加する工程とを備えるものである。   For a workpiece having a cup-shaped portion and a shaft portion that extends integrally in the axial direction from the bottom of the cup-shaped portion, a thermosetting layer is formed on the outer diameter surface of the shaft portion and the inner diameter surface of the cup-shaped portion. A high-frequency induction heating tempering method, in which an induction heating coil for a cup-shaped portion having an axial length shorter than the axial length of the heat treatment portion of the cup-shaped portion is externally or internally fitted to the cup-shaped portion. A step of applying a high-frequency current to the coil while moving the induction heating coil for the cup-shaped portion along the axial direction of the cup-shaped portion, and an axis having an axial length shorter than the axial length of the heat treatment portion of the shaft portion A step of applying a high-frequency current to the coil while externally fitting the induction heating coil for the portion to the shaft portion and moving the induction heating coil for the shaft portion along the axial direction of the shaft portion.

カップ状部用誘導加熱コイルと軸部用誘導加熱コイルに高周波電流を印加することによって、カップ状部用誘導加熱コイルと軸部用誘導加熱コイルとにそれぞれ交流磁界が発生することになる。   By applying a high-frequency current to the cup-shaped induction heating coil and the shaft induction heating coil, an AC magnetic field is generated in each of the cup-shaped induction heating coil and the shaft induction heating coil.

本発明では、高周波電源の加熱出力を調節したり、軸部用誘導加熱コイルやカップ状部用誘導加熱コイルの移動速度を調節したりすることにより投入電力量を調節できる。これにより、ワークの軸部及びカップ状部全体を均一な温度に加熱制御することが可能となる。また、ワークの型番（大きさ、形状）が代わった場合でも、加熱プログラム（コイルの移動速度、高周波電源の加熱出力の条件）を変えることで、軸部用誘導加熱コイルとカップ状部用誘導加熱コイルとを共用することができる。これにより、コイル費の削減と段取り時間の短縮が可能となる。さらには、条件出しテストの際にもコイル形状を調整することなく、加熱プログラムで調節するため、作業性が良く、テスト時間の短縮が可能となるとの利点もある。   In the present invention, the amount of input electric power can be adjusted by adjusting the heating output of the high-frequency power source or adjusting the moving speed of the induction heating coil for the shaft portion or the induction heating coil for the cup-shaped portion. This makes it possible to control the heating of the shaft portion and the entire cup-shaped portion of the workpiece to a uniform temperature. Even if the workpiece model number (size, shape) is changed, by changing the heating program (coil moving speed, heating output condition of the high frequency power supply), induction heating coil for shaft and cup induction A heating coil can be shared. As a result, the coil cost can be reduced and the setup time can be shortened. Furthermore, since the adjustment is performed by the heating program without adjusting the coil shape even in the condition setting test, there is an advantage that the workability is good and the test time can be shortened.

カップ状部用誘導加熱コイルは、カップ状部を包囲してカップ状部の外径面を高周波誘導加熱したり、カップ状部に内嵌されてカップ状部の内径面を高周波誘導加熱したりすることができる。特に、カップ状部に内嵌した場合、カップ状部の内径面を効果的に加熱することができて熱硬化処理層を形成することができる。   The induction heating coil for cup-shaped parts surrounds the cup-shaped part and heats the outer diameter surface of the cup-shaped part by high-frequency induction heating, or is fitted inside the cup-shaped part and heats the inner diameter surface of the cup-shaped part by high-frequency induction heating can do. In particular, when fitted in the cup-shaped part, the inner diameter surface of the cup-shaped part can be effectively heated, and a thermosetting layer can be formed.

このように、本発明では、カップ状部と軸部とを有するワークにおいて、その軸部の外径面及びカップ状部の内径面に熱硬化処理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、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 a cup-shaped portion and a shaft portion, a thermosetting treatment layer can be formed with high accuracy on the outer diameter surface of the shaft portion and the inner diameter surface of the cup-shaped portion. For this reason, the outer joint member of a constant velocity universal joint is optimal as a workpiece.

本発明に係る高周波誘導加熱焼戻装置及び高周波誘導加熱焼戻方法の実施形態を図１〜図６に基づいて説明する。   Embodiments of a high-frequency induction heating and tempering apparatus and a high-frequency induction heating and tempering method according to the present invention will be described with reference to FIGS.

図１は、本発明の第１実施形態の高周波誘導加熱焼戻装置を示している。すなわち、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す。外輪３１は、内面３２ａにトラック溝（図示省略）が形成され、円筒面を有するカップ状のカップ状部（マウス部）３２と、このマウス部３２の底部から軸方向に一体的に延びる軸部（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、軸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。   FIG. 1 shows a high-frequency induction heating tempering apparatus according to a first embodiment of the present invention. That is, 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 is shown. The outer ring 31 has a track groove (not shown) formed on the inner surface 32a, a cup-shaped cup-shaped portion (mouse portion) 32 having a cylindrical surface, and a shaft portion integrally extending in the axial direction from the bottom portion of the mouse portion 32. (Stem portion) 33. 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 the shaft portion and near 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、ステム部３３の外径面を加熱する軸部用高周波誘導加熱焼戻手段４５とマウス部３２の外径面を加熱するカップ状部用高周波誘導加熱焼戻手段４９とから構成される。   The high-frequency induction heating and tempering apparatus includes a high-frequency induction heating and tempering means 45 for the shaft portion that heats the outer diameter surface of the stem portion 33 and a high-frequency induction heating and tempering means 49 for the cup-shaped portion that heats the outer diameter surface of the mouse portion 32. It consists of.

軸部用高周波誘導加熱焼戻手段４５は、外輪のステム部３３に外嵌されて、熱処理部の軸方向長さよりも短い軸方向長さの軸部用誘導加熱コイル５４と、軸部用誘導加熱コイル５４を軸方向に沿って移動させる移動手段（図示省略）と、軸部用誘導加熱コイル５４に高周波電流を印加する高周波電源５６と、高周波電源５６の電流印加量を制御する制御手段６７と、軸部用誘導加熱コイル５４の両端部と高周波電源５６とが接続されるリード部５７とを備える。軸部用誘導加熱コイル５４は、導線（断面円形の導線）５５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、軸部用誘導加熱コイル５４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。軸部用誘導加熱コイル５４が取付けられている部位には、例えば、公知公用のサーボモータ等を利用した移動手段（図示省略）が設けられ、この移動手段にて軸部用誘導加熱コイル５４を駆動して軸方向へ任意に移動・停止することができる。   The high-frequency induction heating and tempering means 45 for the shaft portion is fitted on the stem portion 33 of the outer ring, and the shaft-portion induction heating coil 54 having an axial length shorter than the axial length of the heat treatment portion, and the shaft-portion induction Moving means (not shown) for moving the heating coil 54 along the axial direction, a high-frequency power source 56 for applying a high-frequency current to the induction heating coil 54 for the shaft, and a control means 67 for controlling the amount of current applied to the high-frequency power source 56 And a lead portion 57 to which both ends of the induction heating coil 54 for the shaft portion and the high frequency power source 56 are connected. The shaft induction heating coil 54 is a cylindrical coil (solenoid coil) in which a conducting wire (conducting wire having a circular cross section) 55 is spirally wound. In other words, the outer diameter and the inner diameter of the induction heating coil 54 for the shaft portion are set substantially the same along the axial direction. For example, a moving means (not shown) using a publicly known servo motor or the like is provided at a portion where the shaft portion induction heating coil 54 is attached. It can be arbitrarily moved and stopped in the axial direction by driving.

カップ状部用高周波誘導加熱焼戻手段４９は、外輪のマウス部３２に外嵌されて、熱処理部の軸方向長さよりも短い軸方向長さのカップ状部用誘導加熱コイル５０と、カップ状部用誘導加熱コイル５０を軸方向に沿って移動させる移動手段（図示省略）と、カップ状部用誘導加熱コイル５０に高周波電流を印加する高周波電源５２と、高周波電源５２の電流印加量を制御する制御手段６８と、カップ状部用誘導加熱コイル５０の両端部と高周波電源５２とが接続されるリード部５３とを備える。カップ状部用誘導加熱コイル５０は、導線（断面円形の導線）５１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、カップ状部用誘導加熱コイル５０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。カップ状部用誘導加熱コイル５０が取付けられている部位には、例えば、公知公用のサーボモータ等を利用した移動手段（図示省略）が設けられ、この移動手段にてカップ状部用誘導加熱コイル５０を駆動して軸方向へ任意に移動・停止することができる。   The cup-shaped portion high-frequency induction heating and tempering means 49 is fitted on the outer ring mouth portion 32 and has a cup-shaped induction heating coil 50 having an axial length shorter than the axial length of the heat treatment portion. A moving means (not shown) for moving the induction heating coil 50 for the section along the axial direction, a high frequency power supply 52 for applying a high frequency current to the induction heating coil 50 for the cup-shaped section, and a current application amount of the high frequency power supply 52 are controlled. And a lead portion 53 to which both ends of the cup-shaped induction heating coil 50 and the high-frequency power source 52 are connected. The cup-shaped induction heating coil 50 is a cylindrical coil (solenoid coil) in which a conducting wire (conducting wire having a circular cross section) 51 is spirally wound. That is, the outer diameter and the inner diameter of the cup-shaped portion induction heating coil 50 are set substantially the same along the axial direction. For example, a moving means (not shown) using a publicly known servo motor or the like is provided at a portion where the cup-shaped part induction heating coil 50 is attached, and the cup-shaped part induction heating coil is provided by this moving means. 50 can be driven to arbitrarily move and stop in the axial direction.

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の材料やステンレスを用いた円盤体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の材料やステンレスを用いた円柱体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 a disk body 46 made of an insulating material or stainless steel having a size enough to block the opening of the mouse portion 32. The upper jig 37 includes a cylindrical body 48 made of an insulating material or stainless steel having substantially the same diameter as the end surface 47 of the stem portion 33 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。まず、ワークとしての外輪３１のマウス部３２及びステム部３３の各部位について、条件出しテストを行う。すなわち、マウス部３２とステム部３３との温度を熱電対などで測定し、温度の上がりやすい箇所を加熱上昇率大部とし、温度の上がりにくい箇所を加熱上昇率小部とする。ステム部３３において、根元部分３９近傍のエリア（４）では、軸部用誘導加熱コイル５４に接近しているマウス部３２側に磁束が集中するため、加熱されにくい。このため、エリア（４）が加熱上昇率小部となり、エリア（５）が加熱上昇率大部となる。一方、マウス部３２において、開口部側４２に相当するエリア（１）では、下治具３６側に熱拡散で熱量が奪われ、反開口部側４０に相当するエリア（３）では、マウス部３２とステム部３３の結合部側に熱拡散で熱量が奪われるため、加熱されにくい。このため、エリア（１）及びエリア（３）が加熱上昇率小部となり、エリア（２）が加熱上昇率大部となる。   Next, a high frequency induction heating and tempering method using the high frequency induction heating and tempering device will be described. First, a condition determination test is performed on each part of the mouse part 32 and the stem part 33 of the outer ring 31 as a workpiece. That is, the temperature of the mouse part 32 and the stem part 33 is measured with a thermocouple or the like, and a part where the temperature is likely to rise is set as a large heating increase rate, and a part where the temperature is difficult to rise is set as a small heating increase rate part. In the stem portion 33, in the area (4) near the root portion 39, the magnetic flux concentrates on the side of the mouse portion 32 that is close to the shaft portion induction heating coil 54, so that it is difficult to be heated. For this reason, area (4) becomes a heating increase rate small part, and area (5) becomes a heating increase rate large part. On the other hand, in the mouse part 32, in the area (1) corresponding to the opening part side 42, the amount of heat is deprived by heat diffusion to the lower jig 36 side, and in the area (3) corresponding to the counter opening part side 40, the mouse part Since the amount of heat is deprived by heat diffusion to the joint portion side of 32 and stem portion 33, it is difficult to be heated. For this reason, area (1) and area (3) become a heating increase rate small part, and area (2) becomes a heating increase rate large part.

次に、前記条件出しテストに基づいて、コイルの移動速度と、高周波電源の加熱出力とを決定する。すなわち、加熱上昇率大部では、軸部用誘導加熱コイル５４やカップ状部用誘導加熱コイル５０の移動速度を早くしたり、加熱出力を小さくしたりして、誘導加熱コイルへの投入電力量を小とする。一方、加熱上昇率小部では、誘導加熱コイルの移動速度を遅くしたり、加熱出力を大としたりして、誘導加熱コイルへの投入電力量を大とする。   Next, the moving speed of the coil and the heating output of the high frequency power source are determined based on the condition determination test. That is, in a large heating increase rate, the moving speed of the induction heating coil 54 for the shaft part or the induction heating coil 50 for the cup-shaped part is increased, or the heating output is reduced, so that the amount of power input to the induction heating coil is increased. Is small. On the other hand, in the heating increase rate small part, the moving speed of the induction heating coil is slowed or the heating output is increased to increase the amount of electric power supplied to the induction heating coil.

このため、ステム部３３においては、図２に示すように、軸部用誘導加熱コイル５４がエリア（４）を速度ｖ１で移動するのに対して、エリア（５）を速度ｖ２で移動する。ここで、エリア（４）は、ステム部３３の基部３３ａに対応する範囲であり、エリア（５）は、ステム部３３の本体部３３ｂと先端部３３ｃとに対応する範囲である。また、ｖ１は、図１におけるエリア（４）での軸部用誘導加熱コイル５４の移動速度であり、ｖ２は、図１におけるエリア（５）での軸部用誘導加熱コイル５４の移動速度であり、ｖ１＜ｖ２である。すなわち、ステム部３３では温度の上がり難い付け根部（根元部分）３９のあるエリア（４）で速度を遅くして投入電力量を増やしている。   Therefore, in the stem portion 33, as shown in FIG. 2, the shaft portion induction heating coil 54 moves in the area (4) at the speed v1, whereas the stem section 33 moves in the area (5) at the speed v2. Here, the area (4) is a range corresponding to the base portion 33a of the stem portion 33, and the area (5) is a range corresponding to the main body portion 33b and the distal end portion 33c of the stem portion 33. Further, v1 is a moving speed of the shaft induction heating coil 54 in the area (4) in FIG. 1, and v2 is a moving speed of the shaft induction heating coil 54 in the area (5) in FIG. Yes, v1 <v2. That is, in the stem portion 33, the input power amount is increased by reducing the speed in the area (4) where the base portion (base portion) 39 where the temperature is difficult to rise is present.

また、マウス部３２においては、図３に示すように、カップ状部用誘導加熱コイル５０がエリア（１）を速度ｖ３で移動し、エリア（２）を速度ｖ５で移動し、エリア（３）を速度ｖ４で移動する。ここで、エリア（１）は、マウス部３２の開口部側４２に対応する範囲であり、エリア（２）は、マウス部３２の軸方向中間部４１に対応する範囲であり、エリア（３）は、マウス部３２の反開口部側４０に対応する範囲である。また、ｖ３は、図１におけるエリア（１）でのカップ状部用誘導加熱コイル５０の移動速度であり、ｖ５は、図１におけるエリア（２）でのカップ状部用誘導加熱コイル５０の移動速度であり、ｖ４は、図１におけるエリア（３）でのカップ状部用誘導加熱コイル５０の移動速度であり、ｖ３＜ｖ４＜ｖ５である。すなわち、マウス部３２では、温度の上がり難い外輪開口部側４２と反開口部側４０とで速度を遅くして投入電力量を増やしている。このように、移動速度を変化させることに加えて、制御手段６７、６８を調節して高周波電源５２、５６の加熱出力を変化させることで様々な加熱パターンの組合せが可能である。   Moreover, in the mouse | mouth part 32, as shown in FIG. 3, the induction heating coil 50 for cup-shaped parts moves the area (1) at the speed v3, moves the area (2) at the speed v5, and the area (3). Is moved at a speed v4. Here, area (1) is a range corresponding to the opening side 42 of the mouse part 32, and area (2) is a range corresponding to the axial intermediate part 41 of the mouse part 32, and area (3). Is a range corresponding to the opposite side 40 of the mouse part 32. Further, v3 is the moving speed of the cup-shaped part induction heating coil 50 in the area (1) in FIG. 1, and v5 is the movement of the cup-shaped part induction heating coil 50 in the area (2) in FIG. V4 is the moving speed of the cup-shaped induction heating coil 50 in the area (3) in FIG. 1, and v3 <v4 <v5. That is, in the mouse part 32, the input power amount is increased by reducing the speed on the outer ring opening part side 42 and the counter opening part side 40 where the temperature does not easily rise. As described above, in addition to changing the moving speed, various heating patterns can be combined by adjusting the control means 67 and 68 to change the heating output of the high-frequency power sources 52 and 56.

次に、高周波誘導加熱焼戻しを行う前に、この外輪３１に対して焼入れ（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しを行う。   Next, before performing high-frequency induction heating and tempering, the outer ring 31 is quenched (high-frequency induction heating and quenching). In this case, this high-frequency induction heating and tempering device can be used. After 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、外輪３１と軸部用誘導加熱コイル５４とカップ状部用誘導加熱コイル５０とを同一軸心Ｌ上に配置する。この実施形態において、本発明の軸部がステム部３３にて構成し、カップ状部がマウス部３２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, the shaft induction heating coil 54, and the cup-shaped induction heating coil 50 are arranged on the same axis L. In this embodiment, the shaft portion of the present invention is constituted by the stem portion 33, and the cup-like portion is constituted by the mouse portion 32.

この状態で、軸部用誘導加熱コイル５４に高周波電流を印加する。これによって、軸部用誘導加熱コイル５４に交流磁界が発生する。そして、軸部用誘導加熱コイル５４に設けられている図示省略の移動手段を駆動させて、図１の矢印Ｇで示すように、エリア（４）では速度ｖ１で軸部用誘導加熱コイル５４を移動させ、エリア（５）では速度ｖ２で軸部用誘導加熱コイル５４を移動させる。これにより、軸部用誘導加熱コイル５４にて包囲されているステム部３３の外径面を誘導加熱することができる。この際、制御手段６７を調節して、エリア（４）において、高周波電源５６の加熱出力を大とすることや、エリア（５）において、高周波電源５６の加熱出力を小とすることができる。   In this state, a high-frequency current is applied to the shaft induction heating coil 54. As a result, an alternating magnetic field is generated in the induction heating coil 54 for the shaft portion. Then, a moving means (not shown) provided in the shaft induction heating coil 54 is driven to move the shaft induction heating coil 54 at a speed v1 in the area (4) as shown by an arrow G in FIG. In the area (5), the shaft induction heating coil 54 is moved at the speed v2. Thereby, the outer diameter surface of the stem part 33 surrounded by the induction heating coil 54 for shaft parts can be induction-heated. At this time, the control means 67 can be adjusted to increase the heating output of the high-frequency power source 56 in the area (4), or to decrease the heating output of the high-frequency power source 56 in the area (5).

また、カップ状部用誘導加熱コイル５０に高周波電流を印加する。これによって、カップ状部用誘導加熱コイル５０に交流磁界が発生する。そして、カップ状部用誘導加熱コイル５０に設けられている図示省略の移動手段を駆動させて、図１の矢印Ｈで示すように、エリア（１）では速度ｖ３でカップ状部用誘導加熱コイル５０を移動させ、エリア（２）では速度ｖ５でカップ状部用誘導加熱コイル５０を移動させ、エリア（３）では速度ｖ４でカップ状部用誘導加熱５０を移動させる。これにより、カップ状部用誘導加熱コイル５０にて包囲されているマウス部３２の外径面を誘導加熱することができる。この際、制御手段６８を調節して、エリア（１）やエリア（３）において、高周波電源５２の加熱出力を大とすることや、エリア（２）において、高周波電源５２の加熱出力を小とすることができる。   Further, a high frequency current is applied to the cup-shaped induction heating coil 50. As a result, an AC magnetic field is generated in the induction heating coil 50 for the cup-shaped part. Then, a moving means (not shown) provided in the cup-shaped part induction heating coil 50 is driven to move the cup-shaped part induction heating coil at a speed v3 in the area (1) as shown by an arrow H in FIG. In the area (2), the cup-shaped part induction heating coil 50 is moved at a speed v5, and in the area (3), the cup-shaped part induction heating 50 is moved at a speed v4. Thereby, the outer diameter surface of the mouse | mouth part 32 enclosed by the induction heating coil 50 for cup-shaped parts can be induction-heated. At this time, the control means 68 is adjusted to increase the heating output of the high-frequency power source 52 in the area (1) and the area (3), or to decrease the heating output of the high-frequency power source 52 in the area (2). can do.

すなわち、本発明では、ワークの形状や大きさに応じた加熱出力や周波数で加熱することができる。また、カップ状部用誘導加熱コイル５０や軸部用誘導加熱コイル５４は軸方向に移動・停止しながらワークを加熱することができる。このため、高周波電源５２、５６の加熱出力や周波数を調節したり、カップ状部用誘導加熱コイル５０や軸部用誘導加熱コイル５４の移動速度を調節したりすることにより投入電力量を調節することができる。すなわち、温度が上がりやすい部位（エリア（２）、エリア（５））では、高周波電源５２、５６の加熱出力を小さくするか、カップ状部用誘導加熱コイル５０や軸部用誘導加熱コイル５４の移動速度を早くすることで投入電力量を小さくすることができる。反対に、温度が上がり難い部位（エリア（１）、エリア（３）、エリア（４））では、高周波電源５２、５６の加熱出力を大きくするか、カップ状部用誘導加熱コイル５０や軸部用誘導加熱コイル５４の移動速度を遅くすることで投入電力量を大きくすることができる。これにより、ワークの軸部及びカップ状部全体を均一な温度に加熱制御することが可能となる。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。また、図１におけるＤ部、Ｅ部、Ｆ部の温度変化が図５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及び図５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, in this invention, it can heat with the heating output and frequency according to the shape and magnitude | size of a workpiece | work. Further, the cup-shaped induction heating coil 50 and the shaft induction heating coil 54 can heat the workpiece while moving and stopping in the axial direction. For this reason, the input power amount is adjusted by adjusting the heating output and frequency of the high-frequency power sources 52 and 56, or adjusting the moving speed of the induction heating coil 50 for the cup-shaped part and the induction heating coil 54 for the shaft part. be able to. That is, in the part where the temperature is likely to rise (area (2), area (5)), the heating output of the high frequency power sources 52 and 56 is reduced, or the induction heating coil 50 for the cup-shaped part or the induction heating coil 54 for the shaft part is used. Increasing the moving speed can reduce the amount of input power. On the other hand, in the region where the temperature is difficult to rise (area (1), area (3), area (4)), the heating output of the high frequency power sources 52, 56 is increased, or the induction heating coil 50 for the cup-shaped part or the shaft part The input electric energy can be increased by slowing the moving speed of the induction heating coil 54 for use. Thereby, it becomes possible to control the heating of the shaft portion and the entire cup-shaped portion of the workpiece to a uniform temperature. 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. Moreover, the temperature change of D part in FIG. 1, E part, and F part changes like the graph shown in FIG. 5, and can raise to temperature required for tempering in each site | part. 4 and 5, the temperature between T1 and T2 is a temperature necessary for tempering.

また、ワークの型番（大きさ、形状）が代わった場合でも、加熱プログラム（コイルの移動速度、高周波電源の加熱出力の条件）を変えることで、軸部用誘導加熱コイル５４とカップ状部用誘導加熱コイル５０とを共用することができる。これにより、コイル費の削減と段取り時間の短縮が可能となる。さらには、条件出しテスト（製品温度を熱電対等で測定し、加熱条件を決定するテスト）の際にもコイル形状を調整することなく、加熱プログラムで調節するため、作業性が良く、テスト時間の短縮が可能となるとの利点もある。   Even if the workpiece model number (size, shape) is changed, by changing the heating program (coil moving speed, heating output conditions of the high frequency power supply), the induction heating coil 54 for the shaft portion and the cup-shaped portion The induction heating coil 50 can be shared. As a result, the coil cost can be reduced and the setup time can be shortened. In addition, the adjustment of the heating program without adjusting the coil shape during the conditioning test (the test that determines the heating conditions by measuring the product temperature with a thermocouple, etc.) improves workability and reduces the test time. There is also an advantage that shortening becomes possible.

カップ状部用誘導加熱コイル５０は、マウス部３２を包囲してマウス部３２の外径面を高周波誘導加熱するものである。   The cup-shaped part induction heating coil 50 surrounds the mouse part 32 and heats the outer diameter surface of the mouse part 32 by high-frequency induction heating.

このように、本発明では、カップ状部と軸部とを有するワークにおいて、その軸部の外径面及びカップ状部の内径面に熱硬化処理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、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 a cup-shaped portion and a shaft portion, a thermosetting treatment layer can be formed with high accuracy on the outer diameter surface of the shaft portion and the inner diameter surface of the cup-shaped portion. For this reason, the outer joint member of a constant velocity universal joint is optimal as a workpiece.

次に、図６は本発明の第２実施形態を示し、ステム部３３の外径面を加熱する軸部用高周波誘導加熱焼戻手段４５とマウス部３２の内径面を加熱するカップ状部用高周波誘導加熱焼戻手段６２とから構成される。軸部用高周波誘導加熱焼戻手段４５は、前記第１実施形態と同様のものである。カップ状部用高周波誘導加熱焼戻手段６２は、外輪のマウス部３２に内嵌されて、熱処理部の軸方向長さよりも短い軸方向長さのカップ状部用誘導加熱コイル５８と、カップ状部用誘導加熱コイル５８を軸方向に沿って移動させる移動手段（図示省略）と、カップ状部用誘導加熱コイル５８に高周波電流を印加する高周波電源６０と、高周波電源６０の電流印加量を制御する制御手段６９と、カップ状部用誘導加熱コイル５８の両端部と高周波電源６０とが接続されるリード部６１とを備える。この場合、カップ状部用誘導加熱コイル５８は、前記第１実施形態のカップ状部用誘導加熱コイル５０よりも小径のコイルから構成されている。   Next, FIG. 6 shows a second embodiment of the present invention, for a shaft-shaped high-frequency induction heating tempering means 45 for heating the outer diameter surface of the stem portion 33 and a cup-shaped portion for heating the inner diameter surface of the mouse portion 32. And high-frequency induction heating and tempering means 62. The shaft portion high-frequency induction heating and tempering means 45 is the same as that in the first embodiment. The cup-shaped part high-frequency induction heating and tempering means 62 is fitted in the mouth part 32 of the outer ring, and the cup-shaped part induction heating coil 58 having an axial length shorter than the axial length of the heat treatment part, and a cup-shaped part. A moving means (not shown) for moving the induction heating coil 58 for the portion along the axial direction, a high frequency power supply 60 for applying a high frequency current to the induction heating coil 58 for the cup-like portion, and a current application amount of the high frequency power supply 60 are controlled. And a lead portion 61 to which both end portions of the cup-shaped portion induction heating coil 58 and the high-frequency power source 60 are connected. In this case, the cup-shaped induction heating coil 58 is formed of a coil having a smaller diameter than the cup-shaped induction heating coil 50 of the first embodiment.

この際、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６
５と上治具３７とで支持する。下治具６５はマウス部３２の外径面と略同一径の大きさの
絶縁性の材料やステンレスを用いた短円筒体６６を備える。下治具６５の内径寸法は、カ
ップ状部用誘導加熱コイル５８の外径よりも大である。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の材料やステンレスを用いた円柱体４８を備える。 At this time, the lower ring 6 is set so that the outer ring 31 is in a state where the opening of the mouse portion 32 opens downward.
5 and the upper jig 37. Lower jig 65 comprises a short cylindrical body 6 6 using the size of the insulating material or stainless steel having substantially the same diameter as the outer diameter surface of the mouth portion 32. The inner diameter of the lower jig 65 is larger than the outer diameter of the cup-shaped part induction heating coil 58. The upper jig 37 includes a cylindrical body 48 made of an insulating material or stainless steel having substantially the same diameter as the end surface 47 of the stem portion 33 of the outer ring 31.

次に、この第２実施形態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方法を説明する。この場合も、図６に示した状態にセット（外輪３１と、軸部用誘導加熱コイル５４と、カップ状部用誘導加熱コイル５８とが同一軸心Ｌ上に配設される状態）して、軸部用誘導加熱コイル５４に高周波電流を印加する。そして、前記図１に示す高周波誘導加熱焼戻装置と同様、軸部用誘導加熱コイル５４を、図６の矢印Ｇの方向に移動させてステム部３３の外径面の誘導加熱を行う。   Next, a high frequency induction heating and tempering method using the high frequency induction heating and tempering device of the second embodiment will be described. Also in this case, set in the state shown in FIG. 6 (the state where the outer ring 31, the induction heating coil 54 for the shaft portion, and the induction heating coil 58 for the cup-shaped portion are arranged on the same axis L). Then, a high frequency current is applied to the induction heating coil 54 for the shaft portion. Then, similarly to the high-frequency induction heating and tempering apparatus shown in FIG. 1, the induction heating coil 54 for the shaft portion is moved in the direction of arrow G in FIG. 6 to perform induction heating of the outer diameter surface of the stem portion 33.

また、カップ状部用誘導加熱コイル５８に高周波電流を印加する。これによって、カップ状部用誘導加熱コイル５８に交流磁界が発生する。そして、図６の矢印Ｈで示すように、エリア（１）では速度ｖ３でカップ状部用誘導加熱コイル５８を移動させ、エリア（２）では速度ｖ５でカップ状部用誘導加熱コイル５８を移動させ、エリア（３）では速度ｖ４でカップ状部用誘導加熱コイル５８を移動させる。これにより、カップ状部用誘導加熱コイル５８が内挿されるマウス部３２の内径面を誘導加熱することができる。この際も、エリア（１）やエリア（３）において、高周波電源６０の加熱出力を大とすることや、エリア（２）において、高周波電源６０の加熱出力を小とすることができる。   Further, a high-frequency current is applied to the cup-shaped induction heating coil 58. Thereby, an alternating magnetic field is generated in the induction heating coil 58 for the cup-shaped part. 6, the cup-shaped part induction heating coil 58 is moved at the speed v3 in the area (1), and the cup-shaped part induction heating coil 58 is moved at the speed v5 in the area (2). In the area (3), the cup-shaped part induction heating coil 58 is moved at the speed v4. Thereby, the internal diameter surface of the mouse | mouth part 32 in which the induction heating coil 58 for cup shaped parts is inserted can be induction-heated. Also in this case, the heating output of the high frequency power supply 60 can be increased in the area (1) and the area (3), and the heating output of the high frequency power supply 60 can be decreased in the area (2).

このため、この図６に示す高周波誘導加熱焼戻装置は、図６におけるＤ部、Ｅ部、Ｆ部の温度変化が図５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６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。特に、カップ状部にカップ状部用誘導加熱コイル５８を内嵌しているので、カップ状部の内径面を効果的に加熱することができて熱硬化処理層を形成することができる。なお、図６に示す高周波誘導加熱焼戻装置において、図１に示す高周波誘導加熱焼戻装置と同様の構成については、図１と同一符号を付してその説明を省略する。   Therefore, in the high-frequency induction heating and tempering apparatus shown in FIG. 6, the temperature changes in the D part, the E part, and the F part in FIG. 6 change as shown in the graph shown in FIG. Can be raised to temperature. That is, the high frequency induction heating and tempering apparatus shown in FIG. 6 can achieve the same effects as the high frequency induction heating and tempering apparatus shown in FIG. In particular, since the cup-shaped portion induction heating coil 58 is fitted in the cup-shaped portion, the inner diameter surface of the cup-shaped portion can be effectively heated and a thermosetting layer can be formed. In the high-frequency induction heating and tempering apparatus shown in FIG. 6, the same components as those of the high-frequency induction heating and tempering apparatus shown in FIG.

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、誘導加熱コイル５０、５４、５８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。誘導加熱コイル５０、５４、５８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、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等の種々のワークを用いることができる。   As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the number of turns of the induction heating coils 50, 54, and 58, the 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. As the material of the induction heating coils 50, 54, 58, any material can be used as long as it can generate an AC magnetic field by flowing a high-frequency current. Further, the workpiece is not limited to the outer joint member of the constant velocity universal joint, and various workpieces such as a cylindrical surface having a different diameter on the outer diameter surface can be used.

本発明の第１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。1 is a simplified cross-sectional view of a high-frequency heat induction heating device showing a first embodiment of the present invention. 前記高周波熱誘導加熱装置の軸部用誘導加熱コイルの移動速度を示すグラフ図である。It is a graph which shows the moving speed of the induction heating coil for axial parts of the said high frequency heat induction heating apparatus. 前記高周波熱誘導加熱装置のカップ状部用誘導加熱コイル及びカップ状部用誘導加熱コイルの移動速度を示すグラフ図である。It is a graph which shows the moving speed of the induction heating coil for cup-shaped parts, and the induction heating coil for cup-shaped parts of the said high frequency heat induction heating apparatus. 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. 本発明の第２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 thermal induction heating device showing a second embodiment of the present invention. 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. 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. 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. 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

３１ 外側継手部材
３２ マウス部
３３ ステム部
５０、５８ カップ状部用誘導加熱コイル
５４ 軸部用誘導加熱コイル
５２、５６、６０ 高周波電源
５３、５７、６１ リード線
Ｓ 熱硬化処理層 31 Outer joint member 32 Mouse part 33 Stem part 50, 58 Induction heating coil for cup-shaped part 54 Induction heating coil for shaft part 52, 56, 60 High frequency power supply 53, 57, 61 Lead wire S Thermosetting layer

Claims (7)

ワークを高周波誘導加熱する高周波誘導加熱焼戻装置であって、
ワーク熱処理部の軸方向長さよりも短い軸方向長さの誘導加熱コイルと、この誘導加熱コイルをワーク熱処理部の軸方向に沿って移動させる移動手段と、前記誘導加熱コイルに高周波電流を印加する高周波電源と、前記高周波電源の電流印加量を制御する制御手段とを備え、
前記ワークは、加熱上昇率小部と加熱上昇率大部とを有し、加熱上昇率小部と加熱上昇率大部とで、前記誘導加熱コイルの移動速度と、前記制御手段による電流印加量の少なくとも一方を変化させることを特徴とする高周波誘導加熱焼戻装置。 A high-frequency induction heating and tempering device for induction-heating a workpiece,
An induction heating coil having an axial length shorter than the axial length of the workpiece heat treatment section, a moving means for moving the induction heating coil along the axial direction of the workpiece heat treatment section, and applying a high-frequency current to the induction heating coil A high-frequency power source, and a control means for controlling a current application amount of the high-frequency power source ,
The work has a heating increase rate small portion and a heating increase rate large portion, and the heating rate of the induction heating coil and the amount of current applied by the control means are small. A high-frequency induction heating and tempering device characterized by changing at least one of the above . 前記誘導加熱コイルがワークに外嵌されてワークの外径面を加熱することを特徴とする請求項１の高周波誘導加熱焼戻装置。   2. The high frequency induction heating and tempering apparatus according to claim 1, wherein the induction heating coil is fitted on a work to heat an outer diameter surface of the work. 前記ワークは筒部を有し、前記誘導加熱コイルが筒部に内嵌されて筒部の内径面を加熱することを特徴とする請求項１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 the work has a cylindrical portion, and the induction heating coil is fitted into the cylindrical portion to heat an inner diameter surface of the cylindrical portion. ワークを高周波誘導加熱する高周波誘導加熱焼戻装置であって、
ワーク熱処理部の軸方向長さよりも短い軸方向長さの誘導加熱コイルと、この誘導加熱コイルをワーク熱処理部の軸方向に沿って移動させる移動手段と、前記誘導加熱コイルに高周波電流を印加する高周波電源と、前記高周波電源の電流印加量を制御する制御手段とを備え、
前記ワークはカップ状部と、前記カップ状部の底部から軸方向に一体的に延びる軸部とを有し、
前記誘導加熱コイルは、軸部に外嵌される軸部用誘導加熱コイルと、カップ状部に内嵌又は外嵌されるカップ状部用誘導加熱コイルとを備えたことを特徴とする高周波誘導加熱焼戻装置。 A high-frequency induction heating and tempering device for induction-heating a workpiece,
An induction heating coil having an axial length shorter than the axial length of the workpiece heat treatment section, a moving means for moving the induction heating coil along the axial direction of the workpiece heat treatment section, and applying a high-frequency current to the induction heating coil A high-frequency power source, and a control means for controlling a current application amount of the high-frequency power source,
The workpiece has a cup-shaped portion, and a shaft portion extending integrally in the axial direction from the bottom of the cup-shaped portion,
The induction heating coil includes an induction heating coil for a shaft portion that is externally fitted to a shaft portion, and an induction heating coil for a cup-shaped portion that is internally or externally fitted to a cup-shaped portion. Heat tempering equipment. 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１〜４のいずれか１項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 the workpiece is an outer joint member of a constant velocity universal joint. ワークを高周波誘導加熱する高周波誘導加熱焼戻方法であって、
ワーク熱処理部の軸方向長さよりも短い軸方向長さの誘導加熱コイルを、ワーク熱処理部の軸方向に沿って移動させつつ、前記誘導加熱コイルへの高周波電流の印加量を制御するもので、
ワークにおける加熱上昇率小部での前記誘導加熱コイルの移動速度を、加熱上昇率大部でのコイル移動速度よりも遅くする制御と、ワークにおける加熱上昇率小部での加熱出力を、加熱上昇率大部での加熱出力よりも大きくする制御の少なくとも一方を行うことを特徴とする高周波誘導加熱焼戻方法。 A high frequency induction heating and tempering method for induction heating a work,
Controlling the amount of high-frequency current applied to the induction heating coil while moving the induction heating coil having an axial length shorter than the axial length of the work heat treatment part along the axial direction of the work heat treatment part ,
Control to make the moving speed of the induction heating coil at the small heating increase rate of the workpiece slower than the coil moving speed at the large heating increase rate and the heating output at the small heating increase rate of the workpiece to increase the heating A high-frequency induction heating and tempering method characterized in that at least one of control to make the heating output larger than the heating power at a large part is performed . カップ状部と、前記カップ状部の底部から軸方向に一体的に延びる軸部とを有するワークに対して、その軸部の外径面及びカップ状部の内径面に熱硬化処理層を形成する高周波誘導加熱焼戻方法であって、
カップ状部の熱処理部の軸方向長さよりも短い軸方向長さのカップ状部用誘導加熱コイルを、カップ状部に対して外嵌又は内嵌してカップ状部用誘導加熱コイルをカップ状部の軸方向に沿って移動させつつ、コイルに高周波電流を印加する工程と、
軸部の熱処理部の軸方向長さよりも短い軸方向長さの軸部用誘導加熱コイルを、軸部に対して外嵌して軸部用誘導加熱コイルを軸部の軸方向に沿って移動させつつ、コイルに高周波電流を印加する工程とを備えることを特徴とする高周波誘導加熱焼戻方法。 For a workpiece having a cup-shaped portion and a shaft portion that extends integrally in the axial direction from the bottom of the cup-shaped portion, a thermosetting layer is formed on the outer diameter surface of the shaft portion and the inner diameter surface of the cup-shaped portion. A high-frequency induction heating and tempering method
The cup-shaped induction heating coil is cup-shaped by externally or internally fitting a cup-shaped part induction heating coil having an axial length shorter than the axial length of the heat treatment part of the cup-shaped part. Applying a high frequency current to the coil while moving along the axial direction of the part;
An axial induction heating coil having an axial length shorter than the axial length of the heat treatment portion of the axial portion is externally fitted to the axial portion, and the axial induction heating coil is moved along the axial direction of the axial portion. And a step of applying a high-frequency current to the coil, and a high-frequency induction heating and tempering method.
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