JP3257416B2 - Induction hardening apparatus, induction hardening method, and method for manufacturing hardened product - Google Patents
Induction hardening apparatus, induction hardening method, and method for manufacturing hardened productInfo
- Publication number
- JP3257416B2 JP3257416B2 JP25067696A JP25067696A JP3257416B2 JP 3257416 B2 JP3257416 B2 JP 3257416B2 JP 25067696 A JP25067696 A JP 25067696A JP 25067696 A JP25067696 A JP 25067696A JP 3257416 B2 JP3257416 B2 JP 3257416B2
- Authority
- JP
- Japan
- Prior art keywords
- work
- hole
- induction hardening
- quenching
- conductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- General Induction Heating (AREA)
- Heat Treatment Of Articles (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、貫通孔を有するワ
ークに対して少なくとも貫通孔の内周端部を焼入するた
めの高周波焼入装置に関するものである。また、そのよ
うな高周波焼入方法に関するものであり、さらに、焼入
製品の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction hardening apparatus for hardening at least an inner peripheral end of a through hole in a work having the through hole. Further, the present invention relates to such an induction hardening method and further relates to a method of manufacturing a hardened product.
【０００２】[0002]
【従来の技術】従来より、高周波電流による電磁誘導現
象を利用して、鋼をオーステナイト状態に加熱し焼入す
る方法は、高周波焼入として知られている。2. Description of the Related Art Conventionally, a method of heating and quenching steel in an austenitic state using an electromagnetic induction phenomenon caused by a high-frequency current is known as induction quenching.
【０００３】このような高周波焼入の一例を図５に示
す。図において、符号１０はワーク、符号２０は高周波
焼入装置である。FIG. 5 shows an example of such induction hardening. In the figure, reference numeral 10 denotes a work, and reference numeral 20 denotes an induction hardening device.
【０００４】図示例において、ワーク１０は、内輪１
１、外輪１２、連結部１３から構成されている。ここ
で、内輪１１の内周面は貫通孔１４を画成しており、外
輪１２の外周面にはギヤ１５が形成されている。また、
図示例において、高周波焼入装置２０は、回転可能とさ
れた支持軸２１、支持軸２１に固定された支持台２２、
高周波電極２３、２４から構成されている。[0004] In the illustrated example, the work 10 is an inner ring 1.
1, an outer ring 12, and a connecting portion 13. Here, an inner peripheral surface of the inner race 11 defines a through hole 14, and a gear 15 is formed on an outer peripheral surface of the outer race 12. Also,
In the illustrated example, the induction hardening apparatus 20 includes a rotatable support shaft 21, a support base 22 fixed to the support shaft 21,
It is composed of high frequency electrodes 23 and 24.
【０００５】上記の高周波焼入装置２０を使用してワー
ク１０の内輪１１の端面部Ａ1 および貫通孔１４の内周
端部Ａ2 を焼入するには、まず、端面部Ａ1 を焼入する
ための高周波電極２３、および、内周端部Ａ2 を焼入す
るための高周波電極２４を、図示のように、硬化したい
部分Ａ1 、Ａ2 の表面に近接させる。そして、高周波電
極２２、２３に、例えば、１ｋＨｚ〜数百ｋＨｚの高周
波電流を通じる。すると、電磁誘導現象によって被硬化
部分Ａ1 、Ａ2 の表面層に誘導電流が流れてジュール熱
が発生し、目的部分Ａ1 、Ａ2 が加熱される。加熱後の
冷却には、水あるいは水溶性焼入剤が使用される。In order to harden the end face A1 of the inner ring 11 and the inner peripheral end A2 of the through hole 14 of the work 10 using the above induction hardening apparatus 20, first, the end face A1 is hardened. The high-frequency electrode 23 and the high-frequency electrode 24 for quenching the inner peripheral end A2 are brought close to the surfaces of the portions A1 and A2 to be hardened as shown in the figure. Then, a high-frequency current of, for example, 1 kHz to several hundreds kHz is passed through the high-frequency electrodes 22 and 23. Then, an induced current flows through the surface layers of the hardened portions A1 and A2 due to the electromagnetic induction phenomenon to generate Joule heat, and the target portions A1 and A2 are heated. Water or a water-soluble quenching agent is used for cooling after heating.
【０００６】次に、高周波電極２３、２４を一旦退避さ
せた後、ワーク１０の上下を反転させる。その後、同様
にして、高周波電極２３、２４を目的部分Ｂ1 、Ｂ2 に
近接させて、同様にして、焼入を行う。Next, after the high-frequency electrodes 23 and 24 are temporarily retracted, the work 10 is turned upside down. Thereafter, similarly, the high-frequency electrodes 23 and 24 are brought close to the target portions B1 and B2, and quenching is performed in the same manner.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記従
来の高周波焼入装置２０であると、ワーク１０の厚さが
薄い場合には、以下のような問題が発生する。すなわ
ち、片面側の被硬化部分Ａの焼入を行った後、他面側の
被硬化部分Ｂの焼入を行う際に、ワーク１０の厚さが薄
いことにより、図６に示すように、焼入部分Ａ2 、Ｂ2
にオーバーラップ領域Ｃができてしまう。オーバーラッ
プ領域Ｃにおいては、既に焼入れされた箇所が再加熱さ
れることになるため、焼戻り現象が起こってしまい、所
定硬度が得られなくなってしまう。そのため、オーバー
ラップ領域Ｃについては、所定硬度が得られず、結局、
貫通孔１４の内周端部Ａ2、Ｂ2 については、端面から
の硬化距離の長さが十分にとれないという問題があっ
た。However, with the conventional induction hardening apparatus 20 described above, when the thickness of the work 10 is small, the following problems occur. That is, after quenching the hardened portion A on one side and then hardening the hardened portion B on the other side, the thickness of the work 10 is thin, as shown in FIG. Quenched part A2, B2
, An overlap area C is formed. In the overlap region C, since the already quenched portion is reheated, a tempering phenomenon occurs, and a predetermined hardness cannot be obtained. Therefore, for the overlap region C, the predetermined hardness cannot be obtained, and eventually,
At the inner peripheral ends A2 and B2 of the through holes 14, there is a problem that the curing distance from the end face cannot be sufficiently long.
【０００８】本発明は、上記事情に鑑みてなされたもの
で、高周波焼入を行い得る領域を規制する機能を有する
ことにより、所定の領域に高周波焼入を行い得る高周波
焼入装置を提供することを目的とする。また、そのよう
な高周波焼入方法、ならびに、焼入製品の製造方法を提
供することもまた、本発明の目的である。The present invention has been made in view of the above circumstances, and provides an induction hardening apparatus capable of performing induction hardening in a predetermined area by having a function of regulating an area in which induction hardening can be performed. The purpose is to: It is also an object of the present invention to provide such an induction hardening method as well as a method of manufacturing a quenched product.
【０００９】[0009]
【課題を解決するための手段】請求項１記載の高周波焼
入装置においては、貫通孔を有するワークに対して少な
くとも前記貫通孔の内周端部を焼入するための高周波焼
入装置であって、前記ワークを支持するための支持台
と、前記貫通孔内に挿入可能に配置された高周波電極と
を具備してなり、前記ワークの端面からの焼入距離を規
制するために、前記支持台に、前記貫通孔内に挿入可能
な導電体を設け、該導電体の表面をダミー焼入面とした
ことを特徴としている。請求項２記載の高周波焼入装置
においては、請求項１記載の高周波焼入装置において、
前記導電体は、その導電性が、ワークと同等であるかま
たはワークよりも大きな材料から形成されていることを
特徴としている。請求項３記載の高周波焼入方法におい
ては、貫通孔を有するワークに対して少なくとも前記貫
通孔の内周端部を焼入するための高周波焼入方法であっ
て、前記ワークを支持台により支持し、前記ワークの前
記貫通孔内において、前記支持台に前記ワークの端面か
らの焼入距離を規制するための導電体を設けた状態で、
前記ワークの前記貫通孔内に、高周波電極を挿入し、前
記高周波電極により焼入を行うことを特徴としている。
請求項４記載の焼入製品の製造方法においては、貫通孔
を有するワークに対して少なくとも前記貫通孔の内周両
端部を焼入した焼入製品を製造するための方法であっ
て、前記ワークの一方側の内周端部を焼入し、その後、
請求項３記載の高周波焼入方法により前記ワークの他方
側の内周端部を焼入することにより、前記貫通孔の内周
両端部を焼入した焼入製品を得ることを特徴としてい
る。According to a first aspect of the present invention, there is provided an induction hardening apparatus for hardening at least an inner peripheral end of a through-hole to a work having the through-hole. A support base for supporting the work, and a high-frequency electrode disposed so as to be insertable into the through-hole, the support base for regulating a quenching distance from an end face of the work. The base is provided with a conductor that can be inserted into the through hole, and the surface of the conductor is a dummy hardened surface. In the induction hardening device according to claim 2, in the induction hardening device according to claim 1,
The conductor is characterized by being formed of a material whose conductivity is equal to or larger than that of the work. 4. The induction quenching method according to claim 3, wherein the method further comprises quenching at least an inner peripheral end of the through hole with respect to the work having the through hole, wherein the work is supported by a support. Then, in the through-hole of the work, in a state where a conductor for regulating a quenching distance from an end surface of the work is provided on the support table,
A high frequency electrode is inserted into the through hole of the work, and quenching is performed by the high frequency electrode.
5. The method for manufacturing a quenched product according to claim 4, wherein the method comprises: quenching at least both inner peripheral ends of the through-hole with respect to the work having the through-hole; Quenching the inner peripheral end of one side of
By quenching the inner peripheral end of the other side of the workpiece by the induction hardening method according to claim 3, a quenched product in which both inner peripheral ends of the through hole are quenched is obtained.
【００１０】請求項１記載の発明によると、高周波電極
には、導電体表面とワークの貫通孔の内壁露出面とが対
向することになる。高周波電極に通電した際には、これ
ら導電体表面とワークの貫通孔の内壁露出面とに高周波
電流が誘起される。一方、ワークの貫通孔の内壁面のう
ち、導電体よりも下方に位置する領域は、高周波電極に
対して、直接的に対向していないため、高周波電極の高
周波電界による影響を受けることがなく、この領域に
は、高周波電流が誘起されることはない。つまり、ワー
クの貫通孔内において、高周波電極の近傍に導電体を設
け、この導電体の表面をダミー焼入面として、このダミ
ー焼入面に優先的に高周波電流を誘起させることによ
り、ワークに対する高周波電流の誘起領域を規制するの
である。請求項２記載の発明によると、導電体の導電性
が、ワークと同等であるかまたはワークよりも大きいの
で、導電体に対して優先的に誘導電流が流れ、この導電
体によって高周波電極から遮蔽された領域への電磁放射
が、確実に阻止される。請求項３記載の発明によると、
ワークの貫通孔内において、支持台に導電体を設けた状
態で、焼入が行われる。この場合、ワークの貫通孔の内
壁面のうち導電体から上に位置する表面と導電体の上表
面とに高周波電流が誘起されて、これら表面においての
み焼入がなされ、ワークの貫通孔の内壁面のうち、導電
体によって高周波電極から遮蔽されている領域には、電
磁波が到達せず、焼入は行われない。請求項４記載の発
明によると、ワークの一方側の内周端部を焼入した後、
上記の高周波焼入方法によりワークの他方側の内周端部
を焼入するので、焼入のオーバーラップ領域の発生が阻
止された状態で焼入が達成され、ワークの内周両端部に
おいては、所定の焼入距離が確保される。According to the first aspect of the present invention, the surface of the conductor and the exposed surface of the inner wall of the through hole of the work face the high-frequency electrode. When a high-frequency electrode is energized, a high-frequency current is induced on the surface of the conductor and on the exposed surface of the inner wall of the through hole of the work. On the other hand, among the inner wall surfaces of the through holes of the work, the region located below the conductor is not directly opposed to the high-frequency electrode, and is not affected by the high-frequency electric field of the high-frequency electrode. In this region, no high-frequency current is induced. That is, a conductor is provided in the vicinity of the high-frequency electrode in the through-hole of the work, and the surface of the conductor is used as a dummy hardened surface, and a high-frequency current is preferentially induced on the dummy hardened surface, so that the work for the work is prevented. It regulates the induction region of the high-frequency current. According to the second aspect of the present invention, since the conductivity of the conductor is equal to or larger than that of the work, the induced current flows preferentially to the conductor, and the conductor shields the high-frequency electrode from the high-frequency electrode. Electromagnetic radiation to the defined area is reliably blocked. According to the invention described in claim 3,
In the through hole of the work, quenching is performed with the conductor provided on the support base. In this case, a high-frequency current is induced on the surface of the inner wall surface of the through hole of the work, which is located above the conductor, and on the upper surface of the conductor, and quenching is performed only on these surfaces. Electromagnetic waves do not reach the region of the wall surface that is shielded from the high-frequency electrode by the conductor, and quenching is not performed. According to the invention described in claim 4, after quenching the inner peripheral end on one side of the work,
Since the inner peripheral end of the other side of the work is quenched by the above induction hardening method, quenching is achieved in a state where the occurrence of the overlap region of quenching is prevented. , A predetermined quenching distance is secured.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図面を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１は、本発明の高周波焼入装置の一実施
形態を示すもので、図において従来と同様の部材には、
同一符号を付し、その説明を省略する。本実施形態にお
いては、ワーク１０は鉄製である。FIG. 1 shows an embodiment of an induction hardening apparatus according to the present invention.
The same reference numerals are given and the description is omitted. In the present embodiment, the work 10 is made of iron.
【００１３】本実施形態の最大の特徴点は、支持軸２１
の上端に固定された導電体３０にある。The main feature of this embodiment is that the support shaft 21
The conductor 30 is fixed to the upper end of the conductor 30.
【００１４】導電体３０は、銅製であり、円盤の形態と
されている。この場合、導電体３０は、外径が貫通孔１
４の内径とほぼ等しく設定されており、そのため、図２
に示すように、貫通孔１４の内周面に当接し得るものと
されている。The conductor 30 is made of copper and has a disk shape. In this case, the conductor 30 has an outer diameter of the through hole 1.
4 is set substantially equal to the inner diameter of FIG.
As shown in FIG. 5, the inner peripheral surface of the through hole 14 can be brought into contact with the inner peripheral surface.
【００１５】次に、本実施形態の高周波焼入装置２０を
使用した場合の焼入方法について、また、焼入製品のそ
のような製造方法について説明する。Next, a quenching method using the induction hardening apparatus 20 of the present embodiment and a method of manufacturing a quenched product will be described.
【００１６】まず、図１に示すように、支持台２２上に
ワーク１０を支持する。この場合、支持軸２１を貫通孔
１４内に挿入して、支持を確実にするとともに、所定位
置への位置決めを行う。そして、端面部Ａ1 を焼入する
ための高周波電極２３、および、内周端部Ａ2 を焼入す
るための高周波電極２４を、図示のように、硬化したい
部分Ａ1 、Ａ2 の表面に近接させる。その後、支持軸２
１を回転駆動してワーク１０を回転させつつ、高周波電
極２２、２３に高周波電流を通じる。これにより、電磁
誘導現象によって被硬化部分Ａ1 、Ａ2 の表面層に誘導
電流を誘起して目的部分Ａ1 、Ａ2 を加熱する。加熱後
の冷却には、水あるいは水溶性焼入剤を使用する。First, as shown in FIG. 1, the work 10 is supported on a support base 22. In this case, the support shaft 21 is inserted into the through hole 14 to ensure the support and perform positioning at a predetermined position. Then, the high-frequency electrode 23 for quenching the end face A1 and the high-frequency electrode 24 for quenching the inner peripheral end A2 are brought close to the surfaces of the portions A1 and A2 to be hardened as shown in the figure. Then, support shaft 2
A high-frequency current is passed through the high-frequency electrodes 22 and 23 while the workpiece 10 is rotated by rotating the work 1. As a result, an induction current is induced in the surface layer of the hardened portions A1 and A2 by the electromagnetic induction phenomenon to heat the target portions A1 and A2. Water or a water-soluble quenching agent is used for cooling after heating.
【００１７】次に、高周波電極２３、２４を一旦退避さ
せた後、ワーク１０の上下を反転させる。その後、同様
にして、高周波電極２３、２４を目的部分Ｂ1 、Ｂ2 に
近接させて、同様にして、焼入を行う。Next, after the high-frequency electrodes 23 and 24 are temporarily retracted, the work 10 is turned upside down. Thereafter, similarly, the high-frequency electrodes 23 and 24 are brought close to the target portions B1 and B2, and quenching is performed in the same manner.
【００１８】この場合、図２に示すように、高周波電極
２４には、導電体３０の表面３０ａとワーク１０の貫通
孔１４の内壁露出面（Ｂ2 の領域に相当）とが対向する
ことになる。高周波電極２４に通電した際には、これら
導電体表面３０ａとワーク１０の貫通孔１４の内壁露出
面とに高周波電流が誘起される。一方、ワーク１０の貫
通孔１４の内壁面のうち、導電体３０よりも下方に位置
する領域Ｄは、高周波電極２４に対して、直接的に対向
していないため、高周波電極２４の高周波電界による影
響を受けることがなく、この領域Ｄには、高周波電流が
誘起されることはない。つまり、ワーク１０の貫通孔１
４内において、高周波電極２４の近傍に導電体３０を設
け、この導電体３０の表面３０ａをダミー焼入面とし
て、このダミー焼入面３０ａに優先的に高周波電流を誘
起させることにより、ワーク１０に対する高周波電流の
誘起領域を規制するのである。したがって、ワーク１０
の上端面からの焼入距離は、距離Ｌに規制される。In this case, as shown in FIG. 2, the surface 30a of the conductor 30 and the exposed surface of the inner wall of the through hole 14 of the work 10 (corresponding to the area B2) face the high-frequency electrode 24. . When the high-frequency electrode 24 is energized, a high-frequency current is induced between the conductor surface 30a and the exposed inner wall surface of the through hole 14 of the work 10. On the other hand, in the inner wall surface of the through hole 14 of the workpiece 10, a region D located below the conductor 30 is not directly opposed to the high-frequency electrode 24, and thus is not affected by the high-frequency electric field of the high-frequency electrode 24. There is no influence, and no high-frequency current is induced in this region D. That is, the through hole 1 of the workpiece 10
4, a conductor 30 is provided in the vicinity of the high-frequency electrode 24, and the surface 30a of the conductor 30 is used as a dummy quenching surface, and a high-frequency current is preferentially induced on the dummy quenching surface 30a. This regulates the induction region of the high-frequency current with respect to Therefore, the work 10
Is restricted by the distance L.
【００１９】よって、ワーク１０の厚さが図示のように
薄い場合であっても、既に焼入された領域Ａ2 と、その
後に焼入される領域Ｂ2 との間に、オーバーラップ領域
を発生させることを防止することができる。したがっ
て、焼戻り現象を生じさせることなく、所定の焼入距離
Ｌを確保することができる。Therefore, even when the thickness of the work 10 is thin as shown in the figure, an overlap region is generated between the already hardened region A2 and the subsequently hardened region B2. Can be prevented. Therefore, a predetermined quenching distance L can be secured without causing a tempering phenomenon.
【００２０】また、導電体３０が、銅から形成されてい
るので、導電体３０に誘導電流を優先的に誘起させて、
ワーク１０の端面からの焼入距離の規制効果を確実かつ
有効的にもたらすことができる。Further, since the conductor 30 is made of copper, an induced current is preferentially induced in the conductor 30,
The effect of regulating the quenching distance from the end face of the work 10 can be reliably and effectively provided.
【００２１】また、上記の方法によれば、ワーク１０の
一方側の内周端部Ａ2 を焼入した後、上記の高周波焼入
方法によりワーク１０の他方側の内周端部Ｂ2 を焼入す
るので、ワーク１０の厚さが薄い場合であっても、焼入
のオーバーラップ領域の発生を防止することができ、ワ
ーク１０の内周両端部Ａ2 、Ｂ2 において所定の焼入距
離Ｌを確保した焼入製品を得ることができる。Further, according to the above method, after the inner peripheral end A2 on one side of the work 10 is quenched, the inner peripheral end B2 on the other side of the work 10 is quenched by the above-described induction hardening method. Therefore, even if the thickness of the work 10 is thin, it is possible to prevent the occurrence of the overlap region of quenching, and to secure a predetermined quenching distance L at both ends A2 and B2 of the inner periphery of the work 10. A quenched product can be obtained.
【００２２】なお、本発明は、上記実施形態に限定され
るものではなく、以下の形態とすることもできる。 ａ）導電体３０を支持軸２１の上端面に固定することに
代えて、導電体３０を支持軸２１の上端面に載置するこ
と。この場合においても同様の作用効果を奏することが
できる。 ｂ）導電体３０を貫通孔１４の内周面に当接させること
に代えて、電磁遮蔽効果をもたらし得る限りにおいて、
導電体３０を貫通孔１４の内周面に対して隙間を設けて
配置すること。この場合においても同様の作用効果を奏
することができる。 ｃ）円盤形状の導電体３０に代えて、図３および図４に
示すようなリング形状の導電体３１を使用すること。図
３および図４においては、導電体３１は、固定されてい
ても、載置されているだけであっても、どちらでも良
い。この場合、導電体３１の表面３１ａがダミー焼入面
となり、上記実施形態と同様の作用効果を奏することが
できる。 ｄ）導電体３０を銅から形成することに代えて、アルミ
ニウム、等、他の任意の導電性材料から形成すること。
この場合、導電体３０の導電性が、ワークの導電性と同
等であるかまたは大きいことが好ましい。 ｅ）１回目の焼入、および、２回目の焼入を共に上記高
周波焼入方法により行うことに代えて、１回目は通常の
焼入方法により焼入した後、２回目の焼入だけに上記高
周波焼入方法を適用すること。It should be noted that the present invention is not limited to the above-described embodiment, but may be configured as follows. a) Instead of fixing the conductor 30 to the upper end surface of the support shaft 21, the conductor 30 is placed on the upper end surface of the support shaft 21. In this case, the same operation and effect can be obtained. b) Instead of contacting the conductor 30 with the inner peripheral surface of the through hole 14, as long as an electromagnetic shielding effect can be provided,
The conductor 30 is arranged with a gap with respect to the inner peripheral surface of the through hole 14. In this case, the same operation and effect can be obtained. c) Instead of the disk-shaped conductor 30, a ring-shaped conductor 31 as shown in FIGS. 3 and 4 is used. Figure
In FIG. 3 and FIG. 4 , the conductor 31 may be fixed or merely placed, or may be either. In this case, the surface 31a of the conductor 31 serves as a dummy quenched surface, and the same operation and effect as the above embodiment can be obtained. d) Instead of forming the conductor 30 from copper, it is formed from any other conductive material such as aluminum.
In this case, the conductivity of the conductor 30 is preferably equal to or greater than the conductivity of the work. e) Instead of performing both the first quenching and the second quenching by the induction hardening method, the first quenching is performed by a normal quenching method and then the second quenching is performed. Apply the induction hardening method described above.
【００２３】[0023]
【発明の効果】本発明の高周波焼入装置および高周波焼
入方法ならびに焼入製品の製造方法によれば、以下の効
果を奏する。請求項１記載の高周波焼入装置によれば、
ワークを支持するための支持台には、ワークの貫通孔内
に挿入可能に導電体が設けられており、この導電体の表
面がダミー焼入面をなすので、ワークの端面からの焼入
距離を規制することができ、ワークの厚さが薄い場合で
あっても、焼入のオーバーラップ領域の発生を防止する
ことができる。よって、焼戻り現象を生じさせることな
く、所定の焼入距離を確保することができる。請求項２
記載の高周波焼入装置によれば、導電体の導電性が、ワ
ークと同等であるかまたはワークよりも大きいことによ
り、導電体に誘導電流を優先的に誘起させて、ワークの
端面からの焼入距離の規制効果を確実かつ有効的にもた
らすことができる。請求項３記載の高周波焼入方法によ
れば、ワークの貫通孔内において、支持台に導電体を設
けた状態で、焼入を行うので、ワークの端面からの焼入
距離の規制を行うことができる。請求項４記載の焼入製
品の製造方法によれば、ワークの一方側の内周端部を焼
入した後、上記の高周波焼入方法によりワークの他方側
の内周端部を焼入するので、ワークの厚さが薄い場合で
あっても、焼入のオーバーラップ領域の発生を防止する
ことができ、ワークの内周両端部において所定の焼入距
離を確保した焼入製品を得ることができる。According to the induction hardening apparatus, the induction hardening method and the method for manufacturing a hardened product of the present invention, the following effects can be obtained. According to the induction hardening device according to claim 1,
The support for supporting the work is provided with a conductor that can be inserted into the through hole of the work, and the surface of this conductor forms a dummy quenching surface. Can be restricted, and even when the thickness of the work is thin, it is possible to prevent the occurrence of the quenched overlap region. Therefore, a predetermined quenching distance can be secured without causing a tempering phenomenon. Claim 2
According to the induction hardening apparatus described above, since the conductivity of the conductor is equal to or larger than that of the work, an induced current is preferentially induced in the conductor, and the hardening from the end face of the work is performed. The effect of regulating the entering distance can be reliably and effectively provided. According to the induction hardening method of the third aspect, quenching is performed in a state where the conductor is provided on the support in the through hole of the work, so that the quenching distance from the end face of the work is regulated. Can be. According to the method of manufacturing a quenched product according to the fourth aspect, after quenching the inner peripheral end on one side of the work, the inner peripheral end on the other side of the work is quenched by the induction hardening method. Therefore, even when the thickness of the work is thin, it is possible to prevent the occurrence of a quenched overlap region, and to obtain a quenched product in which a predetermined quenching distance is secured at both ends of the inner periphery of the work. Can be.
【図１】 本発明の高周波焼入装置の一実施形態を示す
断面図である。FIG. 1 is a cross-sectional view showing one embodiment of an induction hardening device of the present invention.
【図２】 図１に示す高周波焼入装置の要部を拡大して
示す断面図である。FIG. 2 is an enlarged sectional view showing a main part of the induction hardening apparatus shown in FIG.
【図３】 本発明の高周波焼入装置の変形形態を示す断
面図である。FIG. 3 is a sectional view showing a modification of the induction hardening apparatus of the present invention.
【図４】 本発明の高周波焼入装置の他の変形形態を示
す断面図である。FIG. 4 is a sectional view showing another modification of the induction hardening apparatus of the present invention.
【図５】 従来の高周波焼入装置を示す断面図である。FIG. 5 is a sectional view showing a conventional induction hardening apparatus.
【図６】 図５に示す高周波焼入装置において、ワーク
の厚さが薄い場合を示す断面図である。In induction hardening apparatus shown in FIG. 6 FIG. 5 is a sectional view showing a case where the thickness of the workpiece is thin.
１０ ワーク １４ 貫通孔 ２０ 高周波焼入装置 ２２ 支持台 ２４ 高周波電極 ３０ 導電体 ３０ａ ダミー焼入面 ３１ 導電体 ３１ａ ダミー焼入面 Ａ2 内周端部 Ｂ2 内周端部 Ｌ 焼入距離 DESCRIPTION OF SYMBOLS 10 Work 14 Through-hole 20 Induction hardening device 22 Support stand 24 High-frequency electrode 30 Conductor 30a Dummy hardened surface 31 Conductor 31a Dummy hardened surface A2 Inner edge B2 Inner edge L Hardening distance
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ２１Ｄ 9/40 Ｃ２１Ｄ 9/40 Ａ Ｂ Ｈ０５Ｂ 6/10 ３３１ Ｈ０５Ｂ 6/10 ３３１ (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 1/10 C21D 1/42 C21D 9/32 C21D 9/40 H05B 6/10 331 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 identification code FI C21D 9/40 C21D 9/40 AB H05B 6/10 331 H05B 6/10 331 (58) Investigation field (Int.Cl. 7 , DB name) C21D 1/10 C21D 1/42 C21D 9/32 C21D 9/40 H05B 6/10 331
Claims (4)
も前記貫通孔の内周端部を焼入するための高周波焼入装
置であって、 前記ワークを支持するための支持台と、前記貫通孔内に
挿入可能に配置された高周波電極とを具備してなり、 前記ワークの端面からの焼入距離を規制するために、前
記支持台に、前記貫通孔内に挿入可能な導電体を設け、
該導電体の表面をダミー焼入面としたことを特徴とする
高周波焼入装置。1. An induction hardening device for quenching at least an inner peripheral end of a through-hole to a work having a through-hole, a support table for supporting the work, and the through-hole. And a high-frequency electrode arranged so as to be insertable into the workpiece, in order to regulate a quenching distance from an end face of the work, the support base is provided with a conductor that can be inserted into the through hole,
An induction hardening device, wherein the surface of the conductor is a dummy hardened surface.
て、 前記導電体は、その導電性が、ワークと同等であるかま
たはワークよりも大きな材料から形成されていることを
特徴とする高周波焼入装置。2. The induction hardening apparatus according to claim 1, wherein said conductor is formed of a material having a conductivity equal to or larger than that of said work. Input device.
も前記貫通孔の内周端部を焼入するための高周波焼入方
法であって、 前記ワークを支持台により支持し、 前記ワークの前記貫通孔内において、前記支持台に前記
ワークの端面からの焼入距離を規制するための導電体を
設けた状態で、前記ワークの前記貫通孔内に、高周波電
極を挿入し、 前記高周波電極により焼入を行うことを特徴とする高周
波焼入方法。3. An induction hardening method for quenching at least an inner peripheral end of a through-hole into a work having a through-hole, wherein the work is supported by a support table, and the work is penetrated through the work. In the hole, a high-frequency electrode is inserted into the through-hole of the work in a state in which a conductor for regulating the quenching distance from the end surface of the work is provided on the support base, An induction hardening method characterized by performing quenching.
も前記貫通孔の内周両端部を焼入した焼入製品を製造す
るための方法であって、 前記ワークの一方側の内周端部を焼入し、 その後、請求項３記載の高周波焼入方法により前記ワー
クの他方側の内周端部を焼入することにより、前記貫通
孔の内周両端部を焼入した焼入製品を得ることを特徴と
する焼入製品の製造方法。4. A method for manufacturing a quenched product in which at least both ends of an inner periphery of a through hole are quenched with respect to a work having a through hole, wherein an inner peripheral end of one side of the work is formed. Then, by quenching the inner peripheral end of the other side of the workpiece by the induction hardening method according to claim 3, a quenched product in which both inner peripheral ends of the through hole are quenched is obtained. A method for producing a quenched product, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25067696A JP3257416B2 (en) | 1996-09-20 | 1996-09-20 | Induction hardening apparatus, induction hardening method, and method for manufacturing hardened product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25067696A JP3257416B2 (en) | 1996-09-20 | 1996-09-20 | Induction hardening apparatus, induction hardening method, and method for manufacturing hardened product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1096012A JPH1096012A (en) | 1998-04-14 |
| JP3257416B2 true JP3257416B2 (en) | 2002-02-18 |
Family
ID=17211396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25067696A Expired - Fee Related JP3257416B2 (en) | 1996-09-20 | 1996-09-20 | Induction hardening apparatus, induction hardening method, and method for manufacturing hardened product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3257416B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4662275B2 (en) * | 2006-03-30 | 2011-03-30 | 高周波熱錬株式会社 | Drive plate induction heating coil, quenching jig, and quenching method |
| JP2019157232A (en) * | 2018-03-15 | 2019-09-19 | Ntn株式会社 | Method of tempering annular work |
-
1996
- 1996-09-20 JP JP25067696A patent/JP3257416B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1096012A (en) | 1998-04-14 |
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