JP2016051670A - Induction heating coil - Google Patents

Induction heating coil Download PDF

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JP2016051670A
JP2016051670A JP2014177819A JP2014177819A JP2016051670A JP 2016051670 A JP2016051670 A JP 2016051670A JP 2014177819 A JP2014177819 A JP 2014177819A JP 2014177819 A JP2014177819 A JP 2014177819A JP 2016051670 A JP2016051670 A JP 2016051670A
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heating coil
circumferential side
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induction heating
induction
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JP6445282B2 (en
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弘子 渡邊
Hiroko Watanabe
弘子 渡邊
栄 奥出
Sakae Okude
栄 奥出
彰 宇田川
Akira Udagawa
彰 宇田川
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Fuji Electronics Industry Co Ltd
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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
    • 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
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  • Heat Treatment Of Articles (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • General Induction Heating (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating coil capable of simultaneously performing induction heating on a wide range reaching a diameter enlarging wall surface from a circumferential side surface of a work-piece.SOLUTION: Disclosed is a semi-open type heating coil 5 which is positioned close to the radial direction and can be arranged opposite to an axial part 11 of a crank shaft 10. This heating coil includes: inner peripheral side curved parts 14a, 14b, 18a, 18b which are adjacent to the axial part 11; and outer peripheral side curved parts 16a, 16b which are separated from the axial part 11 and adjacent to the connection part 21 expanding in the radial direction with continuous to the axial part 11. When a high-frequency current is supplied to the heating coil 5, a high frequency induced current is excited simultaneously to the axial part 11 and the connection part 21, and the axial part 11 and the connection part 21 are excellently heated by induction.SELECTED DRAWING: Figure 3

Description

本発明は、クランクシャフト等のワークの誘導加熱コイルに関するものである。   The present invention relates to an induction heating coil for a workpiece such as a crankshaft.

近年、内燃機関の高出力化が進んでおり、クランクシャフトにはより高い強度が要求されている。特にクランクシャフトのピン部は、高い耐摩耗性と耐久性とが必要である。そこで、従来からピン部を高周波焼入することによって、ピン部の耐摩耗性と耐久性の向上が図られている。このようなピン部に高周波焼入を施す技術が、例えば特許文献１に開示されている。特許文献１には、ピン部とジャーナル部、及びピン部とジャーナル部に連続するフィレット部に焼入硬化層を形成することが開示されている。   In recent years, the output of internal combustion engines has been increasing, and crankshafts are required to have higher strength. In particular, the pin portion of the crankshaft needs high wear resistance and durability. Therefore, the wear resistance and durability of the pin portion are conventionally improved by induction hardening of the pin portion. For example, Patent Document 1 discloses a technique for subjecting such a pin portion to induction hardening. Patent Document 1 discloses that a hardened and hardened layer is formed on a pin portion, a journal portion, and a fillet portion continuous to the pin portion and the journal portion.

特開２０００−３３７３４５号公報JP 2000-337345 A

ところで、従来は、ピン部やジャーナル部からフィレット部に至る広範囲を、一つの加熱コイルで高周波誘導加熱することができず、例えばジャーナル部を誘導加熱する図１３に示す様な半開放型の加熱コイル５０と、フィレット部を誘導加熱する別の加熱コイル（図示せず）を併用していた。すなわち、従来は、２種類の加熱コイルを同時に使用して、ピン部やジャーナル部からフィレット部に至る広範囲を高周波誘導加熱していた。   By the way, conventionally, a wide range from the pin part and the journal part to the fillet part cannot be induction-heated by a single heating coil. For example, the journal part is induction-heated as shown in FIG. The coil 50 and another heating coil (not shown) for induction heating the fillet portion are used in combination. That is, conventionally, two types of heating coils are used at the same time to perform high frequency induction heating over a wide range from the pin portion or journal portion to the fillet portion.

特許文献１には開示されていないが、特許文献１のクランクシャフトの製造方法においても、ピン部やジャーナル部からフィレット部に至る広範囲に渡って、複数の誘導加熱コイルを近接配置し、連続した焼入層が形成されるように誘導加熱を実施しているものと考えられる。
ところが、このように複数の誘導加熱コイルを使用するためには、高周波電源との配線、誘導加熱コイル自身を冷却するための冷却配管、及び誘導加熱コイルを公転移動するピン部に追従させるための追従移動機構が複数必要になり、装置が相当に複雑化してしまう。
そこで本発明は、クランクシャフトのピン部やジャーナル部のようなワークの円周側面から拡径壁面に至る広範囲を、同時に誘導加熱することができる誘導加熱コイルを提供することを課題とする。 Although not disclosed in Patent Document 1, in the crankshaft manufacturing method of Patent Document 1 as well, a plurality of induction heating coils are arranged close to each other over a wide range from the pin portion and the journal portion to the fillet portion. It is considered that induction heating is performed so that a hardened layer is formed.
However, in order to use a plurality of induction heating coils in this way, wiring with a high-frequency power source, cooling piping for cooling the induction heating coil itself, and a pin portion for revolving the induction heating coil are required. A plurality of follow-up movement mechanisms are required, and the apparatus becomes considerably complicated.
Then, this invention makes it a subject to provide the induction heating coil which can carry out induction heating simultaneously the wide range from the circumferential side surface of a workpiece like the pin part of a crankshaft, or a journal part to a diameter-expanded wall surface.

上記課題を解決するための請求項１に記載の発明は、軸芯を中心に回転するワークを誘導加熱するものであり、前記ワークの円周側面と当該円周側面に連続して外側に拡がる拡径壁面を有する部位を焼入れ対象部位とする誘導加熱コイルにおいて、前記誘導加熱コイルは、半開放型のコイルであり、焼入れ対象部位の表面であって円周側面に近接する円周側面近接部と、焼入れ対象部位の表面であって円周側面から離れ、且つ円周側面と連続する拡径壁面に近接する拡径壁面近接部を有することを特徴とする誘導加熱コイルである。   The invention described in claim 1 for solving the above-described problem is to inductively heat a work rotating about an axis, and continuously spreads on the circumferential side surface of the work and the circumferential side surface. In the induction heating coil in which a part having an enlarged wall surface is a quenching target part, the induction heating coil is a semi-open coil, and is a surface of the quenching target part and is adjacent to a circumferential side surface. The induction heating coil is characterized in that it has a diameter-expanded wall surface proximity portion that is a surface of the part to be quenched and is away from the circumferential side surface and is adjacent to the diameter-expanded wall surface that is continuous with the circumferential side surface.

請求項１に記載の発明では、誘導加熱コイルは、半開放型のコイルであるので、ワークに対してワークの半径方向に接近したり、半径方向に離間することができる。
また、誘導加熱コイルは、ワークの焼入れ対象部位の表面であって円周側面に近接する円周側面近接部と、焼入れ対象部位の表面であって円周側面から離れ、且つ円周側面と連続する拡径壁面に近接する拡径壁面近接部を有するので、ワークの円周側面と、円周側面と連続する拡径壁面とを同時に誘導加熱することができる。そのため、ワークの円周側面から拡径壁面に至るまで均一な焼入れ深さが得られる。
さらに、複数の誘導加熱コイルを使用しないので、電気配線及び冷却液の配管の敷設が容易である。 In the first aspect of the present invention, since the induction heating coil is a semi-open coil, the induction heating coil can approach the workpiece in the radial direction of the workpiece or can be separated in the radial direction.
In addition, the induction heating coil is a surface of the workpiece to be quenched and is adjacent to the circumferential side surface adjacent to the circumferential side surface, and is a surface of the workpiece to be quenched that is separated from the circumferential side surface and continuous with the circumferential side surface. Since it has the diameter-expanded wall surface proximity part which adjoins the diameter-expanded wall surface to perform, the circumferential side surface of a workpiece | work and the diameter-expanded wall surface which follows a circumferential side surface can be induction-heated simultaneously. Therefore, a uniform quenching depth can be obtained from the circumferential side surface of the workpiece to the expanded wall surface.
Furthermore, since a plurality of induction heating coils are not used, it is easy to lay electrical wiring and cooling fluid piping.

請求項２に記載の発明は、前記円周側面近接部と拡径壁面近接部は、円弧状に構成されており、前記拡径壁面近接部は、円周側面近接部より大径の部位を有することを特徴とする請求項１に記載の誘導加熱コイルである。   According to a second aspect of the present invention, the circumferential side wall proximity portion and the diameter-expanded wall surface proximity portion are configured in an arc shape, and the diameter-expanded wall surface proximity portion has a larger diameter than the circumferential side surface proximity portion. The induction heating coil according to claim 1, wherein the induction heating coil is provided.

請求項２に記載の発明では、前記円周側面近接部と拡径壁面近接部は、円弧状に構成されているので、ワークの円周側面に沿って配置することができる。また、拡径壁面近接部は、円周側面近接部より大径の部位を有するので、円周側面から離れた拡径壁面に近接し、当該部位を良好に誘導加熱することができる。   In the invention according to claim 2, since the circumferential side surface proximity portion and the diameter-expanded wall surface proximity portion are configured in an arc shape, they can be arranged along the circumferential side surface of the workpiece. Moreover, since the diameter-expanded wall surface proximity portion has a larger-diameter portion than the circumferential side surface proximity portion, the diameter-expanded wall surface proximity portion can be close to the diameter-expanded wall surface away from the circumferential side surface and the portion can be induction-heated well.

円周側面の周囲に、円周側面近接部が対向する角度範囲と、拡径壁面近接部が対向する角度範囲とが同程度であるのが望ましい。このようにすると、円周側面と拡径壁面を同等に誘導加熱することができる。そのため、円周側面と拡径壁面の焼入れ深さを均一化し易い。   It is desirable that the angular range in which the circumferential side surface proximity portion faces around the circumferential side surface is approximately the same as the angular range in which the enlarged wall surface proximity portion faces. If it does in this way, a circumference side surface and a diameter-expanded wall surface can be induction-heated equally. Therefore, it is easy to make the quenching depth of the circumferential side surface and the diameter-expanded wall surface uniform.

本発明の誘導加熱コイルは、ワークの円周側面と、当該円周側面と連続する拡径壁面に同時に近接することができる。そのため、ワークの円周側面と拡径壁面を同時に良好に誘導加熱することができる。   The induction heating coil of the present invention can simultaneously approach the circumferential side surface of the workpiece and the enlarged diameter wall surface continuous with the circumferential side surface. Therefore, the circumferential side surface and the diameter-expanded wall surface of the workpiece can be satisfactorily induction-heated simultaneously.

高周波誘導加熱装置の概略構成図である。It is a schematic block diagram of a high frequency induction heating apparatus. 本発明の実施形態に係る誘導加熱コイル体の斜視図である。It is a perspective view of the induction heating coil body which concerns on embodiment of this invention. 破断したクランクシャフトの一部と共に示した図２の誘導加熱コイル体の加熱コイルの斜視図である。It is a perspective view of the heating coil of the induction heating coil body of FIG. 2 shown with a part of broken crankshaft. 軸部を破断したクランクシャフトと共に示した図３の加熱コイルの正面図である。It is a front view of the heating coil of FIG. 3 shown with the crankshaft which fractured | ruptured the axial part. 誘導加熱時における、図３に示す加熱コイルの近接部及び離間部と、クランクシャフトの位置関係を示す断面図である。It is sectional drawing which shows the positional relationship of the proximity | contact part and separation | spacing part of a heating coil shown in FIG. 3, and a crankshaft at the time of induction heating. 図３とは別の加熱コイルの斜視図である。It is a perspective view of the heating coil different from FIG. 図３、図６とは別の加熱コイルの斜視図である。It is a perspective view of the heating coil different from FIG. 3, FIG. 図３、図６、図７とは別の加熱コイルの斜視図である。FIG. 8 is a perspective view of a heating coil different from those in FIGS. 3, 6, and 7. 図３、図６、図７、図８とは別の加熱コイルの斜視図である。FIG. 9 is a perspective view of a heating coil different from those in FIGS. 3, 6, 7, and 8. 図３、図６、図７、図８、図９とは別の加熱コイルの斜視図である。FIG. 10 is a perspective view of a heating coil different from those in FIGS. 3, 6, 7, 8, and 9. 本実施形態の高周波誘導加熱装置によって誘導加熱され、焼入されたクランクシャフトを切断して示す部分断面図である。It is a fragmentary sectional view which cut | disconnects and shows the crankshaft induction-heated and quenched by the high frequency induction heating apparatus of this embodiment. 本実施形態の高周波誘導加熱装置によって誘導加熱され、焼入された図１１とは異なる形状のクランクシャフトを切断して示す部分断面図である。It is a fragmentary sectional view which cut | disconnects and shows the crankshaft of the shape different from FIG. 11 induction-heated and quenched by the high frequency induction heating apparatus of this embodiment. 断面視したクランクシャフトの一部と共に示した従来の誘導加熱コイルの斜視図である。It is a perspective view of the conventional induction heating coil shown with a part of crankshaft seen in cross section.

以下、図面を参照しながら説明する。
図１に示す様に、高周波誘導加熱装置１は、商用電源から商用電力の供給を受けて高周波発振する高周波発振器２（高周波電源）と、変圧器３とを有している。変圧器３の一次側は、高周波発振器２と接続されている。変圧器３の二次側には接続端子２０ａ、２０ｂが設けられている。接続端子２０ａ、２０ｂには、誘導加熱コイルユニット４（図２）のリード６の端部６ａ、６ｂに固定されたリードブロック７ａ、７ｂが接続されている。リード６は、加熱コイル５と連続している。すなわち、高周波電源をＯＮにすると、加熱コイル５に高周波電流が供給される。 Hereinafter, description will be given with reference to the drawings.
As shown in FIG. 1, the high-frequency induction heating device 1 includes a high-frequency oscillator 2 (high-frequency power source) that oscillates at a high frequency when commercial power is supplied from a commercial power source, and a transformer 3. The primary side of the transformer 3 is connected to the high frequency oscillator 2. Connection terminals 20 a and 20 b are provided on the secondary side of the transformer 3. Connected to the connection terminals 20a and 20b are lead blocks 7a and 7b fixed to ends 6a and 6b of the lead 6 of the induction heating coil unit 4 (FIG. 2). The lead 6 is continuous with the heating coil 5. That is, when the high frequency power supply is turned on, a high frequency current is supplied to the heating coil 5.

図２に示す様に、誘導加熱コイルユニット４は、加熱コイル５、リード６、リードブロック７ａ、７ｂ、側板８ａ、８ｂ等を有している。   As shown in FIG. 2, the induction heating coil unit 4 includes a heating coil 5, leads 6, lead blocks 7a and 7b, side plates 8a and 8b, and the like.

リード６は、銅又は銅合金等の良導体で形成された中空の線状の部材で構成されている。リード６の端部６ａ、６ｂ（図３）には、接続端子であるリードブロック７ａ、７ｂ（図１、図２）が設けられている。リード６は、リードブロック７ａ、７ｂを介して変圧器３の二次側の接続端子２０ａ、２０ｂ（図１）と接続されている。また、リード６には絶縁テープが巻かれており、周囲と電気的に絶縁されている。   The lead 6 is composed of a hollow linear member formed of a good conductor such as copper or a copper alloy. Lead blocks 7a and 7b (FIGS. 1 and 2) serving as connection terminals are provided at ends 6a and 6b (FIG. 3) of the lead 6, respectively. The lead 6 is connected to connection terminals 20a and 20b (FIG. 1) on the secondary side of the transformer 3 via lead blocks 7a and 7b. In addition, an insulating tape is wound around the lead 6 and is electrically insulated from the surroundings.

図２に示す様に、側板８ａ、８ｂは、剛性を有する同じ大きさ及び形状の板状の部材である。側板８ａ、８ｂは、所定の間隔をおいて平行に対向した状態で固定されている。図２に示す様に、側板８ａ、８ｂには凹部１２が設けられている。凹部１２は、半円状のくぼみである。   As shown in FIG. 2, the side plates 8a and 8b are plate-like members having the same size and shape having rigidity. The side plates 8a and 8b are fixed in a state of facing each other at a predetermined interval in parallel. As shown in FIG. 2, the side plates 8a and 8b are provided with recesses 12. The recess 12 is a semicircular recess.

凹部１２の縁部分には中央スペーサ９ａと、側部スペーサ９ｂ、９ｃが配置されている。中央スペーサ９ａは、凹部１２の中央部分に配置されており、側部スペーサ９ｂ、９ｃは、中央スペーサ９ａの両側であって、互いに対向する位置に配置されている。すなわち、半円形の凹部１２を正面視した際の、時計の０時（１２時）の位置に中央スペーサ９ａが配置されており、９時の位置に側部スペーサ９ｂが配置されており、３時の位置に側部スペーサ９ｃが配置されている。各スペーサは、絶縁性及び剛性を有している。また、各スペーサは、先端が凹部１２の内側（内周側）に突出した状態で、側板８ａ、８ｂに対してねじ止め等の固定手段で固定されている。   A central spacer 9 a and side spacers 9 b and 9 c are arranged at the edge of the recess 12. The central spacer 9a is disposed at the central portion of the concave portion 12, and the side spacers 9b and 9c are disposed on opposite sides of the central spacer 9a. That is, when the semicircular recess 12 is viewed from the front, the central spacer 9a is disposed at the time of 0 o'clock (12 o'clock), and the side spacer 9b is disposed at the 9 o'clock position. A side spacer 9c is arranged at the hour position. Each spacer has insulation and rigidity. Each spacer is fixed to the side plates 8a and 8b by a fixing means such as a screw with the tip protruding inside (inner peripheral side) of the recess 12.

側板８ａ、８ｂにおける、凹部１２の開口側には一対の冷却ジャケット４５が装着されている。冷却ジャケット４５には、図示しない配管が接続されており、冷却液供給源から冷却液が供給可能になっている。
また、側板８ａ、８ｂにおける、冷却ジャケット４５とは反対側にはリードブロック７ａ、７ｂが一体固着されている。リードブロック７ａ、７ｂには、前述のリード６の接続端子６ａ、６ｂが接続されている。リード６は、側板８ａ、８ｂの間の空間に収容されており、リードブロック７ａ、７ｂ側から凹部１２側へのびている。リード６は絶縁テープによって被覆されているため、リード６と側板８ａ、８ｂの間の導通は遮断されている。 A pair of cooling jackets 45 is mounted on the side plate 8a, 8b on the opening side of the recess 12. Piping (not shown) is connected to the cooling jacket 45 so that the coolant can be supplied from the coolant supply source.
Lead blocks 7a and 7b are integrally fixed to the side plates 8a and 8b on the side opposite to the cooling jacket 45. The connection terminals 6a and 6b of the lead 6 described above are connected to the lead blocks 7a and 7b. The lead 6 is accommodated in a space between the side plates 8a and 8b, and extends from the lead blocks 7a and 7b to the recess 12 side. Since the lead 6 is covered with an insulating tape, conduction between the lead 6 and the side plates 8a and 8b is interrupted.

次に、本発明の特徴的な構成である加熱コイル５について説明する。
加熱コイル５は、リード６と同様に銅又は銅合金等の良導体で形成された中空の線状の部材で構成されている。加熱コイル５は、１本の線状部材を屈曲、湾曲させて構成することもできるが、分断された線状部材を蝋付けすることによって接合して構成することもできる。 Next, the heating coil 5 which is a characteristic configuration of the present invention will be described.
The heating coil 5 is composed of a hollow linear member formed of a good conductor such as copper or a copper alloy like the lead 6. The heating coil 5 can be configured by bending and bending one linear member, but can also be configured by joining the separated linear members by brazing.

図３に示す様に、加熱コイル５は、半開放型のコイルであり、ワークであるクランクシャフト１０の軸部１１（ピン部、ジャーナル部の円周側面）に対して半径方向に接近したり、軸部１１から半径方向に離間することができる形状を有している。   As shown in FIG. 3, the heating coil 5 is a semi-open coil, and approaches the shaft portion 11 (pin portion, circumferential side surface of the journal portion) of the crankshaft 10 that is a workpiece in the radial direction. The shape can be separated from the shaft portion 11 in the radial direction.

図３に示す様に、加熱コイル５は、中央スペーサ９ａと側部スペーサ９ｂの間の領域と、中央スペーサ９ａと側部スペーサ９ｃの間の領域に分断されて配置されている。   As shown in FIG. 3, the heating coil 5 is divided into a region between the central spacer 9a and the side spacer 9b and a region between the central spacer 9a and the side spacer 9c.

中央スペーサ９ａと側部スペーサ９ｃの間の領域には、直線状の中央部方向変換部１３ａ、内周側湾曲部１４ａ、直線状の端部方向変換部１５ａ、外周側湾曲部１６ａ、内周側湾曲部１８ａが、略四角形の環状構造を呈する様に接合されている。内周側湾曲部１４ａ、１８ａは、図５に示す様に、菱形の断面形状を有しており、中央部方向変換部１３ａ、端部方向変換部１５ａ、外周側湾曲部１６ａは、長方形又は正方形の断面形状を有している。内周側湾曲部１４ａ、内周側湾曲部１８ａが、円周側面近接部を構成しており、外周側湾曲部１６ａが、拡径壁面近接部を構成している。   The region between the central spacer 9a and the side spacer 9c includes a linear central portion direction changing portion 13a, an inner peripheral side bending portion 14a, a linear end direction changing portion 15a, an outer peripheral side bending portion 16a, an inner peripheral portion The side curved portions 18a are joined so as to exhibit a substantially square annular structure. As shown in FIG. 5, the inner circumferential side curved portions 14 a and 18 a have a rhombic cross-sectional shape, and the central direction changing portion 13 a, the end direction changing portion 15 a, and the outer circumferential side curved portion 16 a are rectangular or It has a square cross-sectional shape. The inner circumferential side curved portion 14a and the inner circumferential side curved portion 18a constitute a circumferential side surface proximity portion, and the outer circumferential side curved portion 16a constitutes a diameter-expanded wall surface proximity portion.

中央部方向変換部１３ａと端部方向変換部１５ａは、側板８ａ及び８ｂ（図２）と直交する方向にのびており、加熱コイル５の側板８ａ側の部位と側板８ｂ側の部位とを接続する。内周側湾曲部１４ａは、側板８ｂに沿って略四分の一円弧を描く様にのびている。内周側湾曲部１８ａと外周側湾曲部１６ａは連続しており、側板８ａに沿って、全体で略四分の一円弧を描く様にのびている。
中央部方向変換部１３ａ及び端部方向変換部１５ａと、内周側湾曲部１４ａ、１８ａ、外周側湾曲部１６ａは直交している。
中央部方向変換部１３ａの一端にはリード６が接続されており、他端には内周側湾曲部１４ａの一端が接続されている。 The center direction changing portion 13a and the end direction changing portion 15a extend in a direction perpendicular to the side plates 8a and 8b (FIG. 2), and connect the portion on the side plate 8a side and the portion on the side plate 8b side of the heating coil 5. . The inner circumferential side curved portion 14a extends so as to draw a substantially quarter arc along the side plate 8b. The inner circumferential side curved portion 18a and the outer circumferential side curved portion 16a are continuous and extend along the side plate 8a so as to draw a substantially quarter arc as a whole.
The central portion direction changing portion 13a and the end portion direction changing portion 15a are orthogonal to the inner peripheral bending portions 14a and 18a and the outer peripheral bending portion 16a.
The lead 6 is connected to one end of the central direction changing portion 13a, and one end of the inner peripheral curved portion 14a is connected to the other end.

内周側湾曲部１４ａの曲率半径は、外周側湾曲部１６ａの曲率半径よりも小さい。内周側湾曲部１４ａの他端と外周側湾曲部１６ａの一端は、端部方向変換部１５ａで接続されている。すなわち、内周側湾曲部１４ａと端部方向変換部１５ａは、段違い状に接続されている。また、外周側湾曲部１６ａの他端と内周側湾曲部１８ａの一端が、段違い状に接続されている。さらに、内周側湾曲部１８ａの他端が、迂回部１９の一端と接続されている。   The radius of curvature of the inner peripheral curved portion 14a is smaller than the radius of curvature of the outer peripheral curved portion 16a. The other end of the inner peripheral bending portion 14a and one end of the outer peripheral bending portion 16a are connected by an end direction changing portion 15a. That is, the inner circumferential side curved portion 14a and the end direction changing portion 15a are connected in a stepped manner. Further, the other end of the outer peripheral side bending portion 16a and one end of the inner peripheral side bending portion 18a are connected in a stepped manner. Further, the other end of the inner circumferential side curved portion 18 a is connected to one end of the detour portion 19.

迂回部１９は、中央スペーサ９ａを迂回して、中央スペーサ９ａと側部スペーサ９ｃの間の領域の内周側湾曲部１８ａと、中央スペーサ９ａと側部スペーサ９ｂの間の領域の中央部方向変換部１３ｂとを接続している。
中央スペーサ９ａと側部スペーサ９ｂの間の領域においても、加熱コイル５の直線状の中央部方向変換部１３ｂ、内周側湾曲部１４ｂ、直線状の端部方向変換部１５ｂ、外周側湾曲部１６ｂ（図示せず）、内周側湾曲部１８ｂ（図示せず）が、略四角形の環状構造を呈する様に接合されている。 The bypass portion 19 bypasses the central spacer 9a, and is directed toward the inner peripheral side curved portion 18a in the region between the central spacer 9a and the side spacer 9c, and in the central portion direction of the region between the central spacer 9a and the side spacer 9b. The conversion unit 13b is connected.
Also in the region between the central spacer 9a and the side spacer 9b, the linear central portion direction changing portion 13b, the inner peripheral curved portion 14b, the linear end direction changing portion 15b, and the outer peripheral curved portion of the heating coil 5 are provided. 16b (not shown) and the inner periphery side curved portion 18b (not shown) are joined so as to exhibit a substantially square annular structure.

加熱コイル５における中央スペーサ９ａと側部スペーサ９ｂの間の領域の構成と、中央スペーサ９ａと側部スペーサ９ｃの間の領域の構成は、中央スペーサ９ａを挟んで対称形である。すなわち、内周側湾曲部１４ｂ（円周側面近接部）は、内周側湾曲部１４ａと同様の構成であり、側板８ａ（図２）側に配置されている。また、内周側湾曲部１８ｂ（円周側面近接部）及び外周側湾曲部１６ｂ（拡径壁面近接部）は、各々内周側湾曲部１８ａ及び外周側湾曲部１６ａと同様の構成であり、側板８ｂ（図２）側に配置されている。   The configuration of the region between the central spacer 9a and the side spacer 9b in the heating coil 5 and the configuration of the region between the central spacer 9a and the side spacer 9c are symmetrical with respect to the central spacer 9a. That is, the inner circumferential side curved portion 14b (circumferential side surface proximity portion) has the same configuration as the inner circumferential side curved portion 14a and is disposed on the side plate 8a (FIG. 2) side. Further, the inner peripheral side curved portion 18b (circumferential side surface proximity portion) and the outer peripheral side curved portion 16b (diameter-expanded wall surface adjacent portion) have the same configuration as the inner peripheral side curved portion 18a and the outer peripheral side curved portion 16a, respectively. It arrange | positions at the side plate 8b (FIG. 2) side.

加熱コイル５における中央スペーサ９ａと側部スペーサ９ｂの間の領域の内周側湾曲部１８ｂ（図示せず）は、リード６と接続されている。
すなわち、一対のリード６の一方が、加熱コイル５の中央スペーサ９ａと側部スペーサ９ｃの間の領域の中央部方向変換部１３ａと接続されており、他方のリード６が、加熱コイル５の中央スペーサ９ａと側部スペーサ９ｂの間の領域の内周側湾曲部１８ｂ（図示せず）と接続されている。よって、加熱コイル５は、リード６を介して変圧器３の二次側に電気的に接続されている。リード６は、変圧器３側から加熱コイル５に高周波電流を導く機能を有する。 An inner peripheral curved portion 18 b (not shown) in a region between the central spacer 9 a and the side spacer 9 b in the heating coil 5 is connected to the lead 6.
That is, one of the pair of leads 6 is connected to the center direction changing portion 13a in the region between the center spacer 9a and the side spacer 9c of the heating coil 5, and the other lead 6 is connected to the center of the heating coil 5. It is connected to an inner peripheral curved portion 18b (not shown) in a region between the spacer 9a and the side spacer 9b. Therefore, the heating coil 5 is electrically connected to the secondary side of the transformer 3 via the lead 6. The lead 6 has a function of guiding a high frequency current from the transformer 3 side to the heating coil 5.

加熱コイル５は、側板８ａ、８ｂの凹部１２（図２）に沿って全体で略１８０度の半円形に湾曲した半開放型のコイルである。すなわち、加熱コイル５は、凹部１２と共に一方向側が開放されている。   The heating coil 5 is a semi-open coil that is curved into a semicircular shape of approximately 180 degrees as a whole along the recesses 12 (FIG. 2) of the side plates 8a and 8b. That is, the heating coil 5 is open on one side along with the recess 12.

また、加熱コイル５の内部には、図示しない冷却液の供給源から冷却液が供給され、冷却液によって通電時における加熱コイル５自身の昇温が抑制される。   In addition, a cooling liquid is supplied into the heating coil 5 from a cooling liquid supply source (not shown), and the temperature of the heating coil 5 itself during energization is suppressed by the cooling liquid.

次に、高周波誘導加熱装置１によってクランクシャフト１０を誘導加熱する際の動作について説明する。
クランクシャフト１０は、図５に示す様な軸部１１（円周側面）である複数のピン部（図示せず）と複数のジャーナル部とを有する。軸部１１（ピン部又はジャーナル部）の両側には、境界部２２（Ｒ部）と境界部２２と連続するフィレット部２３（拡径壁面）が存在する。軸部１１とフィレット部２３は直交しており、両者は境界部２２を介して連続している。 Next, the operation when the crankshaft 10 is induction heated by the high frequency induction heating device 1 will be described.
The crankshaft 10 has a plurality of pin portions (not shown) which are shaft portions 11 (circumferential side surfaces) as shown in FIG. 5 and a plurality of journal portions. On both sides of the shaft portion 11 (pin portion or journal portion), there are a boundary portion 22 (R portion) and a fillet portion 23 (expanded wall surface) continuous with the boundary portion 22. The shaft portion 11 and the fillet portion 23 are orthogonal to each other, and both are continuous via the boundary portion 22.

クランクシャフト１０の両端は、回転駆動が可能な図示しない支持機構で支持されている。支持機構で支持されたクランクシャフト１０に対して、誘導加熱コイルユニット４を接近させる。すなわち、クランクシャフト１０の軸芯（又は軸部１１の軸芯１１ａ）がのびる方向と直交する方向から軸部１１（ピン部又はジャーナル部の円周側面）に誘導加熱コイルユニット４を接近させ、軸部１１を凹部１２内に収容する。そして、図４に示す様に、軸部１１に中央スペーサ９ａと側部スペーサ９ｂ又は９ｃを当接させる。   Both ends of the crankshaft 10 are supported by a support mechanism (not shown) that can be rotationally driven. The induction heating coil unit 4 is brought close to the crankshaft 10 supported by the support mechanism. That is, the induction heating coil unit 4 is made to approach the shaft portion 11 (the circumferential side surface of the pin portion or the journal portion) from the direction orthogonal to the direction in which the shaft core of the crankshaft 10 (or the shaft core 11a of the shaft portion 11) extends, The shaft portion 11 is accommodated in the recess 12. Then, as shown in FIG. 4, the center spacer 9 a and the side spacer 9 b or 9 c are brought into contact with the shaft portion 11.

このとき、図５に示す様に、加熱コイル５の内周側湾曲部１４ａ、１４ｂ、１８ａ、１８ｂ（円周側面近接部）が軸部１１に近接する。すなわち、内周側湾曲部１４ａ、１４ｂ、１８ａ、１８ｂは、軸部１１と、境界部２２と、フィレット部２３における軸部１１に近い部位に近接する。また、加熱コイル５の外周側湾曲部１６ａ、１６ｂ（拡径壁面近接部）は、軸部１１から離間しており、フィレット部２３における内周側湾曲部１４ａ、１４ｂ、１８ａ、１８ｂが対向する部位よりも外側の部位に近接している。   At this time, as shown in FIG. 5, the inner circumferential side curved portions 14 a, 14 b, 18 a, 18 b (circumferential side surface proximity portions) of the heating coil 5 approach the shaft portion 11. That is, the inner circumferential side curved portions 14 a, 14 b, 18 a, and 18 b are close to the shaft portion 11, the boundary portion 22, and the portion near the shaft portion 11 in the fillet portion 23. Moreover, the outer peripheral side curved portions 16a and 16b (expanded wall surface proximity portions) of the heating coil 5 are separated from the shaft portion 11, and the inner peripheral side curved portions 14a, 14b, 18a, and 18b in the fillet portion 23 face each other. It is close to the part outside the part.

高周波電源（高周波発振器２）をＯＮにすると、加熱コイル５に高周波電流が通電され、加熱コイル５と近接しているクランクシャフト１０の軸部１１、境界部２２、及びフィレット部２３に同時に高周波の誘導電流が励起され、軸部１１、境界部２２、及びフィレット部２３が同時に誘導加熱されて焼入温度まで昇温する。そして、加熱工程が終了すると、冷却ジャケット４５から冷却液が噴射供給され、誘導加熱された部位が速やかに冷却され、焼入が完了する。   When the high-frequency power source (high-frequency oscillator 2) is turned on, a high-frequency current is passed through the heating coil 5, and a high-frequency current is simultaneously applied to the shaft portion 11, the boundary portion 22 and the fillet portion 23 of the crankshaft 10 close to the heating coil 5. The induced current is excited, and the shaft part 11, the boundary part 22, and the fillet part 23 are simultaneously induction-heated to raise the temperature to the quenching temperature. When the heating process is completed, the coolant is jetted and supplied from the cooling jacket 45, and the induction-heated part is quickly cooled, and the quenching is completed.

誘導加熱時には、クランクシャフト１０は、図示しない支持機構によって回転駆動されている。誘導加熱コイルユニット４は、図示しない周知の吊り下げ機構によって吊り下げられており、クランクシャフト１０の軸部１１上に載置されている。そのため、クランクシャフト１０の軸芯周りに公転移動するピン部（軸部１１）を誘導加熱する場合であっても、誘導加熱コイルユニット４は、軸部１１（ピン部）の公転移動に追従する。そして、軸部１１が１回転すると、軸部１１の周面、及び軸部１１の周面に連続するフィレット部２３は、周上の全領域に渡って加熱コイル５の内周側湾曲部１４ａ、１４ｂ、１８ａ、１８ｂ、及び外周側湾曲部１６ａ、１６ｂと近接対向する。そのため、軸部１１及びフィレット部２３の誘導加熱部位は、周上の全領域に渡って均一に誘導加熱されて昇温する。   During induction heating, the crankshaft 10 is rotationally driven by a support mechanism (not shown). The induction heating coil unit 4 is suspended by a well-known suspension mechanism (not shown), and is placed on the shaft portion 11 of the crankshaft 10. Therefore, even when the pin portion (shaft portion 11) revolving around the axis of the crankshaft 10 is induction heated, the induction heating coil unit 4 follows the revolving movement of the shaft portion 11 (pin portion). . When the shaft portion 11 rotates once, the peripheral surface of the shaft portion 11 and the fillet portion 23 continuous to the peripheral surface of the shaft portion 11 are spread over the entire area on the circumference of the inner peripheral side curved portion 14a of the heating coil 5. , 14b, 18a, 18b, and the outer peripheral side curved portions 16a, 16b. Therefore, the induction heating portions of the shaft portion 11 and the fillet portion 23 are uniformly induction-heated and heated up over the entire region on the circumference.

その結果、図１１に示す様に、軸部１１、境界部２２（Ｒ部）、フィレット部２３における焼入対象部位が、均一に焼入される。
図１１は、高周波誘導加熱装置１によって誘導加熱され、焼入されたクランクシャフト１０を切断して示す部分断面図である。図１１において、左上がりのハッチングで示す様に、軸部１１の外周面からフィレット部２３に至るまで焼入パターンがほぼ均一に連続しており、クランクシャフト１０は良好に焼入されている。 As a result, as shown in FIG. 11, the portions to be quenched in the shaft portion 11, the boundary portion 22 (R portion), and the fillet portion 23 are uniformly quenched.
FIG. 11 is a partial cross-sectional view showing the crankshaft 10 that has been induction-heated and quenched by the high-frequency induction heating device 1. In FIG. 11, as indicated by the left-upward hatching, the quenching pattern continues substantially uniformly from the outer peripheral surface of the shaft portion 11 to the fillet portion 23, and the crankshaft 10 is well quenched.

また、図１２は、クランクシャフト１０とは異なる形状の軸部５１、境界部６２（Ｒ部）、フィレット部６３を有するクランクシャフト６０を切断して示す部分断面図である。図１２に示す様に、クランクシャフト６０の境界部６２（Ｒ部）は、環状に窪んでいる。本実施形態の高周波誘導加熱装置１によって誘導加熱されたクランクシャフト６０の軸５１とフィレット部６３の焼入パターンもほぼ均一に連続している。   FIG. 12 is a partial cross-sectional view showing a crankshaft 60 having a shaft portion 51, a boundary portion 62 (R portion), and a fillet portion 63 having a shape different from that of the crankshaft 10. As shown in FIG. 12, the boundary portion 62 (R portion) of the crankshaft 60 is recessed in an annular shape. The quenching pattern of the shaft 51 of the crankshaft 60 and the fillet portion 63 that are induction-heated by the high-frequency induction heating device 1 of the present embodiment is also substantially uniform.

図６は、図３とは異なる形状を有する加熱コイル２５の斜視図である。図６に示す加熱コイル２５は、中央スペーサ９ａと側部スペーサ９ｃの間の領域にのみ外周側湾曲部１６ａ、２６が設けられている。すなわち、中央スペーサ９ａと側部スペーサ９ｂの間の領域には、外周側湾曲部が設けられていない。   FIG. 6 is a perspective view of a heating coil 25 having a shape different from that in FIG. The heating coil 25 shown in FIG. 6 is provided with outer peripheral curved portions 16a and 26 only in a region between the central spacer 9a and the side spacer 9c. That is, the outer peripheral curved portion is not provided in the region between the central spacer 9a and the side spacer 9b.

換言すると、加熱コイル２５は、図３の加熱コイル５において、長さが長い内周側湾曲部１４ａの代わりに、長さが短い内周側湾曲部２７（内周側湾曲部１８ａと同等の長さ）と、外周側湾曲部２６とが設けられ、描写の都合上、表れていないが、中央スペーサ９ａと側部スペーサ９ｂの間の領域の外周側湾曲部１６ｂ及び内周側湾曲部１８ｂの代わりに、内周側湾曲部２９が設けられたものである。   In other words, the heating coil 25 is the same as the heating coil 5 of FIG. 3 in that the inner circumferential side bending portion 27 (which is equivalent to the inner circumferential side bending portion 18a) has a shorter length instead of the inner circumferential side bending portion 14a having a longer length. Length) and the outer peripheral side curved portion 26, which are not shown for convenience of drawing, but the outer peripheral side curved portion 16b and the inner peripheral side curved portion 18b in the region between the central spacer 9a and the side spacer 9b. Instead of this, an inner peripheral bending portion 29 is provided.

図７は、別の加熱コイル３０の斜視図である。図７に示す加熱コイル３０は、中央スペーサ９ａと側部スペーサ９ｂの間の領域に配置された部位と、中央スペーサ９ａと側部スペーサ９ｃの間の領域に配置された部位とが左右対称になっている。   FIG. 7 is a perspective view of another heating coil 30. In the heating coil 30 shown in FIG. 7, the part arranged in the region between the central spacer 9a and the side spacer 9b and the part arranged in the region between the central spacer 9a and the side spacer 9c are symmetrical. It has become.

すなわち、中央スペーサ９ａと側部スペーサ９ｃの間の領域では、中央スペーサ９ａに近い側に内周側湾曲部３１ａ、３２ａが配置されており、側部スペーサ９ｃに近い側に外周側湾曲部３３ａ、３４ａが配置されている。内周側湾曲部３１ａと外周側湾曲部３３ａとが段を形成して接続されており、内周側湾曲部３２ａと外周側湾曲部３４ａとが段を形成して接続されている。中央スペーサ９ａと側部スペーサ９ｂの間の領域の加熱コイル３０についても同様である。   That is, in the region between the central spacer 9a and the side spacer 9c, the inner peripheral curved portions 31a and 32a are arranged on the side close to the central spacer 9a, and the outer peripheral curved portion 33a on the side close to the side spacer 9c. , 34a are arranged. The inner peripheral bending portion 31a and the outer peripheral bending portion 33a are connected in a stepped manner, and the inner peripheral bending portion 32a and the outer peripheral bending portion 34a are connected in a stepped manner. The same applies to the heating coil 30 in the region between the central spacer 9a and the side spacer 9b.

加熱コイル３０の２組の外周側湾曲部３３ａ、３４ａの長さの和は、図６の加熱コイル２５の外周側湾曲部１６ａの長さと外周側湾曲部２６の長さの和と同じである。また、加熱コイル３０の２組の内周側湾曲部３１ａ、３２ａの長さの和は、図６の加熱コイル２５の内周側湾曲部１８ａ、２７、２８、２９の長さの和と同じである。   The sum of the lengths of the two outer peripheral curved portions 33a and 34a of the heating coil 30 is the same as the sum of the length of the outer peripheral curved portion 16a of the heating coil 25 and the length of the outer peripheral curved portion 26 of FIG. . Further, the sum of the lengths of the two sets of inner peripheral bending portions 31a and 32a of the heating coil 30 is the same as the sum of the lengths of the inner peripheral bending portions 18a, 27, 28 and 29 of the heating coil 25 of FIG. It is.

すなわち、内周側湾曲部の長さの和と外周側湾曲部の長さの和が同じであれば、内周側湾曲部と外周側湾曲部のレイアウトを様々に変更しても、軸部１１、境界部２２、接続部２１の加熱量は同じであり、得られる作用効果に差異はない。換言すると、軸部１１（円周側面）の周囲に、内周側湾曲部（円周側面近接部）が対向する角度範囲と、外周側湾曲部（拡径壁面近接部）が対向する角度範囲は同程度である。   In other words, as long as the sum of the lengths of the inner peripheral side curved portion and the outer peripheral side curved portion is the same, the shaft portion can be changed even if the layout of the inner peripheral side curved portion and the outer peripheral side curved portion is changed variously. 11, the boundary part 22 and the heating amount of the connection part 21 are the same, and there is no difference in the effect obtained. In other words, an angular range in which the inner curved portion (circumferential side surface proximity portion) faces around the shaft portion 11 (circumferential side surface) and an angular range in which the outer circumferential side curved portion (diameter-enlarged wall surface proximity portion) faces. Are comparable.

図８は、別の加熱コイル３５の斜視図である。図８に示す加熱コイル３５は、中央スペーサ９ａと側部スペーサ９ｃの間の領域では、中央スペーサ９ａ側から側部スペーサ９ｃ側にかけて徐々に外側（外周側）に拡がる曲線を描いてのびる拡径円弧部３６ａ、３６ｂを備えている。また、中央スペーサ９ａと側部スペーサ９ｂの間の領域には、加熱コイル３５は、内周側湾曲部３７ａ、３７ｂを備えている。   FIG. 8 is a perspective view of another heating coil 35. In the region between the central spacer 9a and the side spacer 9c, the heating coil 35 shown in FIG. 8 has an enlarged diameter that draws a curve that gradually expands outward (outer peripheral side) from the central spacer 9a side to the side spacer 9c side. Arc portions 36a and 36b are provided. Moreover, the heating coil 35 is provided with the inner periphery side curved parts 37a and 37b in the area | region between the center spacer 9a and the side part spacer 9b.

図９は、別の加熱コイル４０の斜視図である。図９に示す加熱コイル４０は、中央スペーサ９ａと側部スペーサ９ｃの間の領域では、図８に示す加熱コイル３５において、拡径円弧部３６ａ、３６ｂの代わりに、直線部４１ａ、４１ｂを備えている。加熱コイル４０のその他の構成は、加熱コイル３５の構成と同じである。   FIG. 9 is a perspective view of another heating coil 40. The heating coil 40 shown in FIG. 9 includes straight portions 41a and 41b in the region between the central spacer 9a and the side spacer 9c, instead of the enlarged-arc portions 36a and 36b in the heating coil 35 shown in FIG. ing. Other configurations of the heating coil 40 are the same as those of the heating coil 35.

加熱対象のワークの形状又は加熱条件によっては、内周側湾曲部の中心角を、外周側湾曲部の中心角よりも大きく設定することもできる。
図１０は、さらに別の加熱コイル７０の斜視図である。図１０に示す加熱コイル７０は、中央スペーサ９ａと側部スペーサ９ｃの間の領域に外周側円弧部７１ａ、７１ｂを備えており、中央スペーサ９ａと側部スペーサ９ｂの間の領域に内周側円弧部７２ａ、７２ｂを備えている。内周側円弧部７２ａ、７２ｂの中心角は、外周側円弧部７１ａ、７１ｂの中心角よりも大きい。そのため、図１０に示す様に、内周側円弧部７２ａ、７２ｂが、外周側円弧部７１ａ、７１ｂよりも長くなっている。 Depending on the shape of the workpiece to be heated or the heating conditions, the central angle of the inner peripheral side curved portion can be set larger than the central angle of the outer peripheral side curved portion.
FIG. 10 is a perspective view of still another heating coil 70. A heating coil 70 shown in FIG. 10 includes outer peripheral arc portions 71a and 71b in a region between the central spacer 9a and the side spacer 9c, and an inner peripheral side in a region between the central spacer 9a and the side spacer 9b. Arc portions 72a and 72b are provided. The central angles of the inner peripheral arc portions 72a and 72b are larger than the central angles of the outer peripheral arc portions 71a and 71b. For this reason, as shown in FIG. 10, the inner circumferential arc portions 72a and 72b are longer than the outer circumferential arc portions 71a and 71b.

また、加熱コイル７０は、全体で略１８０度の半開放形を呈しているが、中央スペーサ９ａの位置が中央からずれている。換言すると、中央スペーサ９ａは、ワーク（軸部）の真上に配置されているが、左側側部スペーサ９ｂは、ワーク（軸部）の中心位置よりも下方に配置され、右側側部スペーサ９ｃは、ワーク(軸部)の中心位置よりも上方に配置されている。すなわち、中央スペーサ９ａと左側側部スペーサ９ｂの間隔は、中央スペーサ９ａと右側側部スペーサ９ｃの間隔よりも大きい。そして、加熱コイル７０は、全体として中心角が約１８０度程度となっている。加熱コイル７０では、前述のその他の各加熱コイルとは違い、ワーク（軸部）の挿入方向が、図１０に矢印Ａで示す様に、斜め下方から斜め上方を向く方向となっている。   Further, the heating coil 70 has a semi-open shape of approximately 180 degrees as a whole, but the position of the central spacer 9a is shifted from the center. In other words, the central spacer 9a is disposed immediately above the workpiece (shaft portion), but the left side spacer 9b is disposed below the center position of the workpiece (shaft portion), and the right side spacer 9c. Is disposed above the center position of the workpiece (shaft portion). That is, the distance between the center spacer 9a and the left side spacer 9b is larger than the distance between the center spacer 9a and the right side spacer 9c. The heating coil 70 has a central angle of about 180 degrees as a whole. In the heating coil 70, unlike the other heating coils described above, the insertion direction of the workpiece (shaft portion) is a direction from diagonally downward to diagonally upward as indicated by an arrow A in FIG.

図３、図６〜図１０に示す各加熱コイル５、２５、３０、３５、４０、７０は、ワークの加熱部位の形状及び大きさに応じて任意に採用することができる。また、内周側湾曲部の中心角と外周側湾曲部の中心角は、加熱コイル全体が１８０度以内の半開放形であることを条件として、軸部１１、境界部２２、フィレット部２３の形状及び大きさに応じて適切に設定する。   Each of the heating coils 5, 25, 30, 35, 40, and 70 shown in FIGS. 3 and 6 to 10 can be arbitrarily employed depending on the shape and size of the heating part of the workpiece. Further, the central angle of the inner peripheral side bending portion and the central angle of the outer peripheral side bending portion are determined on the condition that the entire heating coil is a semi-open shape within 180 degrees of the shaft portion 11, the boundary portion 22, and the fillet portion 23. Set appropriately according to the shape and size.

５ 加熱コイル（誘導加熱コイル）
１０ クランクシャフト（ワーク）
１１ 軸部（円周側面）
１４ａ、１４ｂ、１８ａ、１８ｂ 内周側湾曲部（円周側面近接部）
１６ａ、１６ｂ 外周側湾曲部（拡径壁面近接部）
２１ クランクシャフトの接続部（拡径壁面） 5 Heating coil (induction heating coil)
10 Crankshaft (workpiece)
11 Shaft (circumferential side)
14a, 14b, 18a, 18b Inner circumferential curved portion (circumferential side surface proximity portion)
16a, 16b Peripheral curved portion (expanded wall surface proximity portion)
21 Crankshaft connection (expanded wall)

Claims (2)

軸芯を中心に回転するワークを誘導加熱するものであり、
前記ワークの円周側面と当該円周側面に連続して外側に拡がる拡径壁面を有する部位を焼入れ対象部位とする半開放型の誘導加熱コイルにおいて、
前記誘導加熱コイルは、半開放型のコイルであり、
焼入れ対象部位の表面であって円周側面に近接する円周側面近接部と、
焼入れ対象部位の表面であって円周側面から離れ、且つ円周側面と連続する拡径壁面に近接する拡径壁面近接部を有することを特徴とする誘導加熱コイル。 Inductive heating of a work that rotates around its axis,
In the semi-open type induction heating coil in which a part having a diameter-expanded wall surface extending continuously outward from the circumferential side surface of the workpiece and the circumferential side surface is a part to be quenched,
The induction heating coil is a semi-open coil,
A circumferential side surface proximity part that is the surface of the part to be quenched and is close to the circumferential side surface;
An induction heating coil having a diameter-expanded wall surface proximity portion that is a surface of a part to be quenched and is separated from a circumferential side surface and close to a diameter-expanded wall surface that is continuous with the circumferential side surface. 前記円周側面近接部と拡径壁面近接部は、円弧状に構成されており、
前記拡径壁面近接部は、円周側面近接部より大径の部位を有することを特徴とする請求項１に記載の誘導加熱コイル。 The circumferential side surface proximity portion and the enlarged diameter wall surface proximity portion are configured in an arc shape,
The induction heating coil according to claim 1, wherein the diameter-expanded wall surface proximity portion has a portion having a larger diameter than the circumferential side surface proximity portion.
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* Cited by examiner, † Cited by third party
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JPH08143947A (en) * 1994-11-25 1996-06-04 Fuji Denshi Kogyo Kk Coil for quenching end surface of flange surface
JP2003282231A (en) * 2002-03-25 2003-10-03 Fuji Electronics Industry Co Ltd Induction heating coil for thin work and induction quenching apparatus using the same
JP2008293851A (en) * 2007-05-25 2008-12-04 Fuji Electronics Industry Co Ltd Induction heating coil body
JP2013051182A (en) * 2011-08-31 2013-03-14 Neturen Co Ltd Induction heating coil
JP2013124376A (en) * 2011-12-13 2013-06-24 Fuji Electronics Industry Co Ltd High-frequency induction heating method

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Publication number Priority date Publication date Assignee Title
JPH08143947A (en) * 1994-11-25 1996-06-04 Fuji Denshi Kogyo Kk Coil for quenching end surface of flange surface
JP2003282231A (en) * 2002-03-25 2003-10-03 Fuji Electronics Industry Co Ltd Induction heating coil for thin work and induction quenching apparatus using the same
JP2008293851A (en) * 2007-05-25 2008-12-04 Fuji Electronics Industry Co Ltd Induction heating coil body
JP2013051182A (en) * 2011-08-31 2013-03-14 Neturen Co Ltd Induction heating coil
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020027732A (en) * 2018-08-10 2020-02-20 富士電子工業株式会社 Heating coil for heating for high frequency induction heating
JP7287636B2 (en) 2018-08-10 2023-06-06 富士電子工業株式会社 Heating coil for high frequency induction heating

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