JP2012134080A - Heating conductor for high frequency heating device - Google Patents

Heating conductor for high frequency heating device Download PDF

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JP2012134080A
JP2012134080A JP2010286877A JP2010286877A JP2012134080A JP 2012134080 A JP2012134080 A JP 2012134080A JP 2010286877 A JP2010286877 A JP 2010286877A JP 2010286877 A JP2010286877 A JP 2010286877A JP 2012134080 A JP2012134080 A JP 2012134080A
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heating conductor
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Junji Minoue
潤二 己之上
Akira Udagawa
彰 宇田川
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Fuji Electronics Industry Co Ltd
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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
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Abstract

PROBLEM TO BE SOLVED: To provide a heating conductor for a high frequency heating device, which can perform excellent hardening of a heating target having an irregular surface and can be easily manufactured.SOLUTION: In a heating conductor 3 for a high frequency heating device 1 performing high frequency induction heating of a heating target 4, the heating conductor 3 has a plurality of curved pieces 9a-9c and the curved pieces 9a-9c are arcuate having the same radius with one another. The center of the arc of each of the curved pieces 9a-9c are arranged on the same straight line L and the curved pieces 9a-9c are linked to create a stepwise linkage.

Description

本発明は、高周波電流を通じた加熱導体を被加熱物に近接配置し、被加熱物を誘導加熱する高周波加熱装置の加熱導体に関するものである。   The present invention relates to a heating conductor of a high-frequency heating device that places a heating conductor through a high-frequency current close to an object to be heated and induction-heats the object to be heated.

鉄鋼素材からなる被加熱物に、高周波電流を通じた加熱導体を近接配置すると、被加熱物の表面には高周波の誘導電流が励起される。励起された誘導電流は、被加熱物の表面に沿って流れる。ここで被加熱物の表面に凹凸があると、誘導電流は基本的には凸部から凹部を経て別の凸部へ流れる。   When a heating conductor through which a high-frequency current is passed is placed close to a heated object made of a steel material, a high-frequency induced current is excited on the surface of the heated object. The excited induced current flows along the surface of the object to be heated. Here, if the surface of the object to be heated has irregularities, the induced current basically flows from the convex part to another convex part through the concave part.

特許文献１の高周波焼入れ装置では、歯車の歯面を歯先から歯底に至るまで誘導加熱することができるワンターン形状の加熱導体（特許文献１では高周波コイルと称している。）が採用されている。すなわち、歯車の周囲に環状の加熱導体を配置し、加熱導体を流れる高周波電流によって、歯車の歯面に励起される誘導電流が歯先（凸部）から歯底（凹部）を経て別の歯先（凸部）に流れる。その結果、歯面は一様の焼入れ深さで焼入れされる。   The induction hardening apparatus of Patent Document 1 employs a one-turn heating conductor (referred to as a high frequency coil in Patent Document 1) that can inductively heat the gear tooth surface from the tooth tip to the tooth bottom. Yes. That is, an annular heating conductor is arranged around the gear, and the induction current excited on the tooth surface of the gear by the high-frequency current flowing through the heating conductor passes from the tooth tip (convex portion) to the tooth bottom (concave portion) to another tooth. It flows to the tip (convex part). As a result, the tooth surface is quenched with a uniform quenching depth.

特開平６−７３４５６号公報JP-A-6-73456

ところが、被加熱物がねじである場合、特許文献１に開示されている加熱導体（高周波コイル）を採用すると、ねじ山は焼入れされ易いが、ねじ底はほとんど焼入れされない。これは、加熱導体がねじの螺旋に対してほとんど角度差がないために、誘導電流が加熱導体から比較的近いねじ山に沿って流れ易くなり、逆にねじ底はねじ山よりも加熱導体から遠いために誘導電流が流れにくくなるためであると考えられる。   However, when the object to be heated is a screw, if the heating conductor (high-frequency coil) disclosed in Patent Document 1 is adopted, the screw thread is easily quenched, but the screw bottom is hardly quenched. This is because the heating conductor has little angular difference with respect to the helix of the screw, so that the induced current tends to flow along the thread relatively close to the heating conductor, and conversely, the screw bottom is from the heating conductor rather than the thread. This is considered to be because it is difficult for the induced current to flow because it is far away.

そこで本件出願人は、誘導電流がねじ山からねじ底を経て隣接する別のねじ山に流れるように、加熱導体を配置する高周波焼入装置（特願２００９−２３７７３）を創案した。特願２００９−２３７７３の発明では、はすば歯車の歯筋に対して、加熱導体部を４５度乃至１３５度の範囲の傾斜角を成して対向させている。その結果、はすば歯車に励起される誘導電流は、歯先に沿って流れるよりも、歯先から歯底を経て別の歯先に向かう方向に流れ易くなり、はすば歯車は良好に焼入れされる。   Therefore, the present applicant has invented an induction hardening apparatus (Japanese Patent Application No. 2009-23773) in which a heating conductor is arranged so that an induced current flows from a screw thread to another adjacent screw thread through a screw bottom. In the invention of Japanese Patent Application No. 2009-23773, the heating conductor is opposed to the helical gear of the helical gear with an inclination angle in the range of 45 degrees to 135 degrees. As a result, the induced current excited by the helical gear is more likely to flow in the direction from the tooth tip to the other tooth tip than to flow along the tooth tip. Quenched.

ところが、この特願２００９−２３７７３号の発明で採用する加熱導体は、はすば歯車の同一横断面上の円周に沿って湾曲するだけではなく、軸方向にも湾曲しており、形状が複雑であり、熟練者でなければ精度よく製造することができない。特に、はすば歯車の直径が小さくなる程、対応する加熱導体の加工は困難である。   However, the heating conductor employed in the invention of this Japanese Patent Application No. 2009-23773 is not only curved along the circumference on the same cross section of the helical gear, but also curved in the axial direction, and the shape is It is complicated and cannot be produced with high accuracy unless it is an expert. In particular, the smaller the diameter of the helical gear, the more difficult it is to process the corresponding heating conductor.

そこで本発明は、表面に凹凸がある被加熱物を良好に焼入れすることができると共に、容易に製造することができる高周波加熱装置の加熱導体を提供することを目的としている。   Accordingly, an object of the present invention is to provide a heating conductor of a high-frequency heating device that can satisfactorily quench an object to be heated and has an uneven surface and can be easily manufactured.

上記課題を解決するための請求項１の発明は、被加熱物を高周波誘導加熱する高周波加熱装置の加熱導体において、前記加熱導体は複数の分割片を有しており、誘導加熱時における被加熱物の設置位置に沿って、前記各分割片が段状に連結されることを特徴とする高周波加熱装置の加熱導体である。   The invention of claim 1 for solving the above-mentioned problem is a heating conductor of a high-frequency heating apparatus for high-frequency induction heating of an object to be heated. The heating conductor has a plurality of divided pieces and is heated during induction heating. A heating conductor of a high-frequency heating device, wherein each of the divided pieces is connected in a step-like manner along an object installation position.

請求項１の発明では、誘導加熱時における被加熱物の設置位置に沿って、加熱導体の各分割片が段状に連結されるので、誘導加熱時に設置された被加熱物の円周方向に各分割片が沿うと共に、各分割片の段状に連結される部分が被加熱物の軸方向に沿う。そのため、加熱導体に供給される高周波電流は被加熱物の周囲を円周上に流れると共に軸方向にも流れる。その結果、被加熱物の表面に筋状の凸部と凹部とが形成されていても、各分割片か、又は各分割片が連結される部分のいずれか一方が、必ず被加熱物の表面の凸部と凹部の筋と４５度以上１３５度以下の角度で対向する。よって、被加熱物の表面に励起される高周波誘導電流は、凸部に沿って流れるだけではなく、必ず凸部から凹部を経て別の凸部へと流れ、被加熱物の表面を略一様に誘導加熱することができる。   In the invention of claim 1, since the divided pieces of the heating conductor are connected in a step shape along the installation position of the object to be heated at the time of induction heating, in the circumferential direction of the object to be heated installed at the time of induction heating Along with each divided piece, a portion connected in a step shape of each divided piece is along the axial direction of the object to be heated. For this reason, the high-frequency current supplied to the heating conductor flows around the object to be heated on the circumference and also in the axial direction. As a result, even if streaky convex portions and concave portions are formed on the surface of the object to be heated, either one of the divided pieces or the portion to which the divided pieces are connected is always on the surface of the object to be heated. The convex portion and the concave portion are opposed to each other at an angle of 45 degrees or more and 135 degrees or less. Therefore, the high-frequency induced current excited on the surface of the object to be heated not only flows along the convex part, but always flows from the convex part to the other convex part through the concave part, and the surface of the heated object is substantially uniform. Induction heating can be used.

また、仮に被加熱物が、軸方向に平行な歯筋を有する歯車である場合には、分割片によって歯先から歯底を経て別の歯先へと誘導電流を励起させることができる。その結果、被加熱物の表面を略一様な焼入れ深さで焼入れすることができる。   Further, if the object to be heated is a gear having tooth traces parallel to the axial direction, the induced current can be excited from the tooth tip to the other tooth tip by the divided piece. As a result, the surface of the object to be heated can be quenched with a substantially uniform quenching depth.

請求項２の発明は、前記各分割片が、同一半径又は略同一半径の円弧状であることを特徴とする請求項１に記載の高周波加熱装置の加熱導体である。   The invention according to claim 2 is the heating conductor of the high-frequency heating device according to claim 1, wherein each of the divided pieces has an arc shape having the same radius or substantially the same radius.

請求項２の発明では、各分割片が同一半径又は略同一半径であるので、各分割片を被加熱物の円周方向に沿って配置することができる。その結果、被加熱物の表面に安定した誘導電流を励起させ易くなる。   In the invention of claim 2, since each divided piece has the same radius or substantially the same radius, each divided piece can be arranged along the circumferential direction of the object to be heated. As a result, it becomes easy to excite a stable induced current on the surface of the object to be heated.

請求項３の発明は、各分割片の端部同士が直に連結される部分を有することを特徴とする請求項１又は請求項２に記載の高周波加熱装置の加熱導体である。   A third aspect of the present invention is the heating conductor of the high-frequency heating device according to the first or second aspect, wherein the end portions of the respective divided pieces are directly connected to each other.

請求項３の発明では、各分割片の端部同士が直に連結される部分を有するので、当該部分において高周波電流は、各分割片の端から端まで流れ、そして隣接する分割片に跨がって流れる。よって、被加熱物の周方向に励起される高周波誘導電流が増加すると共に、被加熱物の軸方向にも高周波電流が流れる。その結果、被加熱物の表面の凹凸が、各分割片に対して４５度以上の角度で対向する筋状の凹凸である場合に、各分割片及び各分割片を跨がって流れる高周波電流によって、被加熱物には凹凸を横切って高周波誘導電流が流れる。また、被加熱物が歯車であって、歯筋が歯車の軸方向に沿っている場合においても、各分割片及び各分割片を跨がって流れる高周波電流によって励起される高周波誘導電流が、歯先から歯底に至るまで良好に流れる。よって、被加熱物の表面を良好に焼入れすることができる。   In the invention of claim 3, since the end portions of the respective divided pieces have a portion directly connected to each other, the high frequency current flows from the end to the end of each divided piece and straddles the adjacent divided pieces. It flows. Therefore, the high-frequency induction current excited in the circumferential direction of the object to be heated increases, and the high-frequency current also flows in the axial direction of the object to be heated. As a result, when the unevenness on the surface of the object to be heated is a streak-like unevenness facing each divided piece at an angle of 45 degrees or more, the high-frequency current flowing across each divided piece and each divided piece As a result, a high-frequency induced current flows through the unevenness in the object to be heated. In addition, even when the object to be heated is a gear and the tooth trace is along the axial direction of the gear, the high frequency induction current excited by the high frequency current flowing across each divided piece and each divided piece is It flows well from the tooth tip to the tooth bottom. Therefore, the surface of the object to be heated can be well quenched.

各分割片を連結して段状部を構成し、段状部の両端が被加熱物の軸回りの略半周に至るように構成するのが好ましい。このように構成すると、加熱導体は被加熱物に対して半径方向に接近及び離間することができる。よって、高周波加熱装置の設備の省スペース化を図ることができる。   It is preferable that the divided pieces are connected to form a stepped portion so that both ends of the stepped portion reach a substantially half circumference around the axis of the object to be heated. If comprised in this way, a heating conductor can approach and separate in a radial direction with respect to a to-be-heated material. Therefore, space saving of the equipment of the high frequency heating device can be achieved.

本発明の高周波加熱装置の加熱導体は、加熱導体に供給される高周波電流が、被加熱物の周囲を円周方向に流れると共に軸方向にも直交して流れる。その結果、被加熱物の表面に筋状の凸部と凹部とが形成されていても、各分割片か、又は各分割片が連結される部分のいずれか一方が、被加熱物の筋状の凸部及び凹部と必ず４５度以上１３５度以下の角度で対向する。よって、被加熱物の表面に励起される高周波誘導電流は、凸部に沿って流れるだけではなく、必ず凸部から凹部を経て別の凸部へと流れ、被加熱物の表面を略一様な焼入れ深さで焼入れすることができる。   In the heating conductor of the high-frequency heating device of the present invention, the high-frequency current supplied to the heating conductor flows in the circumferential direction around the object to be heated and also in the axial direction. As a result, even if streaky convex portions and concave portions are formed on the surface of the object to be heated, either one of the divided pieces or the portion to which each divided piece is connected is a streak of the heated object. It always faces the convex part and the concave part at an angle of 45 degrees to 135 degrees. Therefore, the high-frequency induced current excited on the surface of the object to be heated not only flows along the convex part, but always flows from the convex part to the other convex part through the concave part, and the surface of the heated object is substantially uniform. Quenching can be done with a deep quenching depth.

本発明の加熱導体を備えた高周波加熱装置の系統図である。It is a systematic diagram of the high frequency heating apparatus provided with the heating conductor of this invention. 高周波加熱装置に設けた本発明の加熱導体の斜視図である。It is a perspective view of the heating conductor of this invention provided in the high frequency heating apparatus. （ａ）は、加熱導体の段状部の分解斜視図であり、（ｂ）は、段状部の組立斜視図である。(A) is a disassembled perspective view of the step part of a heating conductor, (b) is an assembly perspective view of a step part. 図３の段状部を平面視した際の断面図であり、（ａ）は分解図であり、（ｂ）は（ａ）の状態から各湾曲片の両端に蝋を充填して閉塞した状態を示しており、（ｃ）は組立図である。It is sectional drawing at the time of planar view of the step part of FIG. 3, (a) is an exploded view, (b) is the state which filled the both ends of each curved piece from the state of (a), and was obstruct | occluded. (C) is an assembly drawing. 加熱導体の平面図であり、（ａ）は段状部が３つの湾曲片で構成されている場合を示し、（ｂ）は段状部が４つの湾曲片で構成されている場合を示し、（ｃ）は段状部が５つの湾曲片で構成されている場合を示している。It is a top view of a heating conductor, (a) shows the case where the stepped portion is composed of three curved pieces, (b) shows the case where the stepped portion is composed of four curved pieces, (C) has shown the case where the step part is comprised by five curved pieces. 図３とは別の形態の段状部の斜視図であり、（ａ）は分解図を示し、（ｂ）は組立図を示している。It is a perspective view of the step-shaped part of the form different from FIG. 3, (a) shows the exploded view, (b) has shown the assembly drawing. 図６の段状部を平面視した断面図であり、（ａ）は分解図を示し、（ｂ）は組立図を示している。It is sectional drawing which planarly viewed the step-shaped part of FIG. 6, (a) has shown the exploded view, (b) has shown the assembly drawing. （ａ）は、図６の段状部を備えた加熱導体の平面図であり、（ｂ）は、４つの湾曲片と３つの接続片からなる段状部を備えた加熱導体の平面図である。(A) is a top view of the heating conductor provided with the step part of FIG. 6, (b) is a top view of the heating conductor provided with the step part which consists of four curved pieces and three connection pieces. is there. 本発明の段状部を有する加熱導体を備えた高周波加熱装置によって誘導加熱されたはすば歯車の部分拡大断面図である。It is a partial expanded sectional view of the helical gear induction-heated by the high frequency heating apparatus provided with the heating conductor which has a step-shaped part of this invention. （ａ）は、図６とは別の段状部の分解斜視図であり、（ｂ）は、（ａ）の組立斜視図である。(A) is a disassembled perspective view of the step part different from FIG. 6, (b) is an assembly perspective view of (a). 直線状の分割片で構成された段状部の正面図である。It is a front view of the step part comprised with the linear division | segmentation piece.

以下、図面を参照しながら本発明の加熱導体の構成を説明する。
図１に示すように高周波加熱装置１０は、高周波電源１，トランス２，加熱導体３を有している。高周波電源１は、交流電源から供給される交流を高周波化する高周波発信器を備えている。そして、高周波発信器で高周波に変換された交流が、トランス２へ出力される。トランス２は１次側２ａと２次側２ｂの巻き線を有しており、１次側２ａが高周波電源１に接続されており、２次側２ｂが後述の加熱導体３に接続されている。そして、トランス２によって高周波電力が高圧化され、加熱導体３へ出力される。すなわち、トランス２は、図示しない出力端子を備えている。 Hereinafter, the configuration of the heating conductor of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the high frequency heating apparatus 10 includes a high frequency power source 1, a transformer 2, and a heating conductor 3. The high frequency power source 1 includes a high frequency transmitter that increases the frequency of alternating current supplied from an alternating current power source. Then, the alternating current converted into a high frequency by the high frequency transmitter is output to the transformer 2. The transformer 2 has windings of a primary side 2a and a secondary side 2b, the primary side 2a is connected to the high frequency power source 1, and the secondary side 2b is connected to a heating conductor 3 described later. . The high frequency power is increased by the transformer 2 and output to the heating conductor 3. That is, the transformer 2 includes an output terminal (not shown).

図１に示すように加熱導体３は、焼入れ時に被加熱物４に近接配置される。加熱導体３は、中空の導体で形成されている。また、加熱導体３は、本発明の特徴的な構成部分である段状部５（後述）の両側に、各々１本の中空の導体が接続される構成を有している。以下、加熱導体３の構成を説明する。   As shown in FIG. 1, the heating conductor 3 is disposed close to the object to be heated 4 during quenching. The heating conductor 3 is formed of a hollow conductor. The heating conductor 3 has a configuration in which one hollow conductor is connected to each side of a stepped portion 5 (described later) which is a characteristic component of the present invention. Hereinafter, the configuration of the heating conductor 3 will be described.

加熱導体３は、複数の中空の導体が直列に接続される構成を有しており、その両端には図示しない入力端子が設けられている。この入力端子には、トランス２の出力端子が接続される。そして加熱導体３には、この入力端子を介して、高周波電源側から高周波電流が供給される。   The heating conductor 3 has a configuration in which a plurality of hollow conductors are connected in series, and input terminals (not shown) are provided at both ends thereof. The output terminal of the transformer 2 is connected to this input terminal. A high-frequency current is supplied to the heating conductor 3 from the high-frequency power source side through this input terminal.

加熱導体３は、大きく分類して段状部５，直線部６ａ〜６ｄ，円周部７ａ〜７ｄ，リード部８ａ，８ｂを有している。このうち、リード部８ａ，８ｂは、高周波電源側から高周波電流を受ける入力端子が設けられる部位である。また、リード部８ａ，８ｂの間には、直線部６ａ〜６ｄ，円周部７ａ〜７ｄ，段状部５が配置される。直線部６ａ〜６ｄ，円周部７ａ〜７ｄ，リード部８ａ，８ｂの外径は四角柱状であり、各々銅や銅合金等の中空の良導体で形成されている。   The heating conductor 3 is roughly classified into a stepped portion 5, straight portions 6a to 6d, circumferential portions 7a to 7d, and lead portions 8a and 8b. Among these, the lead portions 8a and 8b are portions where input terminals for receiving a high-frequency current from the high-frequency power source side are provided. Further, straight portions 6a to 6d, circumferential portions 7a to 7d, and stepped portion 5 are disposed between the lead portions 8a and 8b. The straight portions 6a to 6d, the circumferential portions 7a to 7d, and the lead portions 8a and 8b have a quadrangular columnar outer diameter, and are each formed of a hollow good conductor such as copper or copper alloy.

本実施の形態では、リード部８ａには、円周部７ａ，直線部６ａ，円周部７ｂ，直線部６ｂが、この順に接続されている。また、リード部８ｂには、円周部７ｄ，直線部６ｄ，円周部７ｃ，直線部６ｃが、この順に接続されている。そして、直線部６ｂと直線部６ｃは、段状部５で接続されている。図２に示すように、円周部７ａ〜７ｄは同じ半径を有しており、円周部７ａ〜７ｄの円弧中心ｃ２，ｃ１，ｃ７，ｃ６は、同一の直線Ｌ上に配置されている。図２において一点鎖線で示す直線Ｌは、誘導加熱時における被加熱物の中心（軸）と一致する。   In the present embodiment, a circumferential portion 7a, a straight portion 6a, a circumferential portion 7b, and a straight portion 6b are connected to the lead portion 8a in this order. Further, a circumferential portion 7d, a straight portion 6d, a circumferential portion 7c, and a straight portion 6c are connected to the lead portion 8b in this order. The straight portion 6 b and the straight portion 6 c are connected by the stepped portion 5. As shown in FIG. 2, the circumferential portions 7a to 7d have the same radius, and the arc centers c2, c1, c7, and c6 of the circumferential portions 7a to 7d are arranged on the same straight line L. . A straight line L indicated by a one-dot chain line in FIG. 2 coincides with the center (axis) of the object to be heated at the time of induction heating.

図３に示すように段状部５は、中空で外形が四角柱状の３つの湾曲片９ａ〜９ｃ（分割片）で構成されている。図３に示す各湾曲片９ａ〜９ｃは、形状及び大きさが同じである。すなわち、各湾曲片９ａ〜９ｃは、円周部７ａ〜７ｄと同じ半径の円弧状の中空導体である。また、湾曲片９ａ〜９ｃは中空の導体であるが、図４（ｂ）に示すように両方の端面１１ａ，１１ｂは蝋１６ａ，１６ｂによって閉塞され、側面１２ａ，１２ｂの端部にそれぞれ開口１３ａ及び１３ｂが設けられている。すなわち、開口１３ａは、一方の側面１２ａの端面１１ｂ側に設けられており、開口１３ｂは、他方の側面１２ｂの端面１１ａ側に設けられている。よって、開口１３ａは、開口１３ｂを設けた側面１２ｂとは反対側の側面１２ａに設けられており、さらに開口１３ａは、開口１３ｂが設けられた端部１１ａとは反対側の端部１１ｂの近傍に設けてある。   As shown in FIG. 3, the stepped portion 5 is composed of three curved pieces 9 a to 9 c (divided pieces) that are hollow and have a quadrangular prism shape. Each of the bending pieces 9a to 9c shown in FIG. 3 has the same shape and size. In other words, the curved pieces 9a to 9c are arcuate hollow conductors having the same radius as the circumferential portions 7a to 7d. The curved pieces 9a to 9c are hollow conductors. However, as shown in FIG. 4B, both end surfaces 11a and 11b are closed by waxes 16a and 16b, and openings 13a are formed at the end portions of the side surfaces 12a and 12b. And 13b. That is, the opening 13a is provided on the end surface 11b side of the one side surface 12a, and the opening 13b is provided on the end surface 11a side of the other side surface 12b. Therefore, the opening 13a is provided on the side surface 12a opposite to the side surface 12b provided with the opening 13b, and the opening 13a is in the vicinity of the end portion 11b opposite to the end portion 11a provided with the opening 13b. Is provided.

各湾曲片９ａ〜９ｃは、以上のような形状を呈している。そして、湾曲片９ａの開口１３ａと湾曲片９ｂの開口１３ｂが位置合わせされて、図４（ｃ）に示すように湾曲片９ａと湾曲片９ｂは接合（蝋付け）される。同様に、湾曲片９ｂの開口１３ａと湾曲片９ｃの開口１３ｂが位置合わせされて、湾曲片９ｂと湾曲片９ｃが接合（蝋付け）される。その結果、図４（ｃ）に示すように、湾曲片９ａ〜９ｃは段状に接合されて段状部５が形成される。すなわち、図２に示すように、段状部５を構成する湾曲片９ａ〜９ｃの円弧中心ｃ３〜ｃ５は、同一の直線Ｌ上に配置されている。この直線Ｌは、誘導加熱時における被加熱物の中心（軸）と一致する。また、各湾曲片９ａ〜９ｃの円弧中心ｃ３〜ｃ５と、円周部７ａ〜７ｄの円弧中心ｃ２，ｃ１，ｃ７，ｃ６は、同一の直線Ｌ上に配置されている。   Each bending piece 9a-9c is exhibiting the above shapes. Then, the opening 13a of the bending piece 9a and the opening 13b of the bending piece 9b are aligned, and the bending piece 9a and the bending piece 9b are joined (brazed) as shown in FIG. 4C. Similarly, the opening 13a of the bending piece 9b and the opening 13b of the bending piece 9c are aligned, and the bending piece 9b and the bending piece 9c are joined (brazed). As a result, as shown in FIG. 4C, the curved pieces 9 a to 9 c are joined in a step shape to form a stepped portion 5. That is, as shown in FIG. 2, the arc centers c <b> 3 to c <b> 5 of the curved pieces 9 a to 9 c constituting the stepped portion 5 are arranged on the same straight line L. This straight line L coincides with the center (axis) of the object to be heated during induction heating. The arc centers c3 to c5 of the curved pieces 9a to 9c and the arc centers c2, c1, c7, and c6 of the circumferential portions 7a to 7d are arranged on the same straight line L.

湾曲片９ａの開口１３ｂは、段状部５の一方の端部に位置しており、湾曲片９ｃの開口１３ａは、段状部５の他方の端部に位置している。そして、湾曲片９ａの開口１３ｂ側には直線部６ｂが接続（蝋付け）され、湾曲片９ｃの開口１３ａには直線部６ｃが接続（蝋付け）される。その結果、段状部５は円周部７ａ〜７ｄと同じ半径で湾曲すると共に、湾曲片９ａ〜９ｃは、対向相手の被加熱物４の軸方向（直線Ｌが延びる方向）に段状に位置がずれている。   The opening 13 b of the curved piece 9 a is located at one end of the stepped portion 5, and the opening 13 a of the curved piece 9 c is located at the other end of the stepped portion 5. The straight portion 6b is connected (brazed) to the opening 13b side of the curved piece 9a, and the straight portion 6c is connected (brazed) to the opening 13a of the curved piece 9c. As a result, the stepped portion 5 is curved with the same radius as the circumferential portions 7a to 7d, and the curved pieces 9a to 9c are stepped in the axial direction (the direction in which the straight line L extends) of the opposite object to be heated 4. The position is shifted.

そして、加熱導体３の各円周部７ａ〜７ｄ，直線部６ａ〜６ｄ，及び段状部５（湾曲片９ａ〜９ｃ）は中空の導体であり、各々が接続されると、一連の冷却水通路が形成される。すなわち、加熱導体３の内部には図示しない冷却水供給管から冷却水が供給可能であり、冷却水は加熱導体３内を流通できる。   And each circumference part 7a-7d of the heating conductor 3, linear part 6a-6d, and the step part 5 (curved piece 9a-9c) are hollow conductors, and when each is connected, a series of cooling water A passage is formed. That is, cooling water can be supplied to the inside of the heating conductor 3 from a cooling water supply pipe (not shown), and the cooling water can flow through the heating conductor 3.

ここで各湾曲片９ａ〜９ｃの半径は、図３に示すように同じであってもよいが、ある特定の湾曲片（例えば湾曲片９ｂ）の半径に対して、その他の湾曲片（例えば湾曲片９ａ，９ｃ）の半径はプラスマイナス１０％の範囲内であればよく、特にプラスマイナス５％以内であるのが好ましい。そして各湾曲片９ａ〜９ｃの半径を相違させる場合には、各湾曲片９ａ〜９ｃの円弧中心ｃ３〜ｃ５を同一の直線Ｌ上に配置せず、各湾曲片９ａ〜９ｃを被加熱物４の外周の形状に合わせて配置する。   Here, the radii of the respective curved pieces 9a to 9c may be the same as shown in FIG. 3, but other curved pieces (for example, curved pieces) are used with respect to the radius of a specific curved piece (for example, the curved piece 9b). The radius of the pieces 9a, 9c) may be within a range of plus or minus 10%, and is preferably within plus or minus 5%. And when making the radius of each curved piece 9a-9c different, the arc centers c3-c5 of each curved piece 9a-9c are not arrange | positioned on the same straight line L, but each curved piece 9a-9c is to be heated 4 It arrange | positions according to the outer periphery shape of.

以上のように加熱導体３は構成されており、高周波電源から供給される高周波電流は、リード部８ａ，８ｂの間を、円周部７ａ，直線部６ａ，円周部７ｂ，直線部６ｂ，段状部５，直線部６ｃ，円周部７ｃ，直線部６ｄ，円周部７ｄの順（又はこの逆の順）に流れる。   As described above, the heating conductor 3 is configured, and the high-frequency current supplied from the high-frequency power source passes between the lead portions 8a and 8b between the circumferential portion 7a, the straight portion 6a, the circumferential portion 7b, the straight portion 6b, It flows in the order of the stepped portion 5, the straight portion 6c, the circumferential portion 7c, the straight portion 6d, and the circumferential portion 7d (or the reverse order).

加熱導体３は、下方が開いたいわゆる半開放鞍型と呼ばれる形式である。よって、加熱導体３は、被加熱物４に対して半径方向に接近及び離間することができる。具体的には、被加熱物４がはすば歯車であるとすると、はすば歯車４に対して加熱導体３を、はすば歯車４の半径方向に接近又は離間させることができる。よって、加熱導体３の段状部５を、はすば歯車４に容易に対向配置することができる。   The heating conductor 3 is a so-called semi-open saddle type in which the lower part is opened. Therefore, the heating conductor 3 can approach and separate from the object to be heated 4 in the radial direction. Specifically, if the article to be heated 4 is a helical gear, the heating conductor 3 can be moved closer to or away from the helical gear 4 in the radial direction of the helical gear 4. Therefore, the stepped portion 5 of the heating conductor 3 can be easily disposed opposite to the helical gear 4.

次に、以上説明したように構成された加熱導体３を備えた高周波加熱装置１０（図１）によって、被加熱物４を誘導加熱する際の状況を説明する。
まず、図示しない駆動装置によって加熱導体３を移動させ、被加熱物４に近接配置する。そして被加熱物４は、図示しない別の駆動装置によって回転駆動され、さらに高周波電源１からトランス２を経て高周波電流が加熱導体３に供給される。高周波電流は加熱導体３内の段状部５を流れる。高周波電流は、段状部５の湾曲片９ａ〜９ｃに沿って被加熱物４の円周方向に流れると共に、各湾曲片の接続部において湾曲片と直交する方向（直線Ｌが延びる方向）に流れる。すなわち高周波電流は、図４（ｃ）において矢印Ｂで示す円周方向と、矢印Ｃで示す円周方向と直交する方向（図２の直線Ｌが延びる方向）に直交するように流れる。 Next, the situation when the object to be heated 4 is inductively heated by the high-frequency heating device 10 (FIG. 1) provided with the heating conductor 3 configured as described above will be described.
First, the heating conductor 3 is moved by a driving device (not shown), and is placed close to the object to be heated 4. The object to be heated 4 is rotationally driven by another drive device (not shown), and a high frequency current is supplied from the high frequency power source 1 to the heating conductor 3 via the transformer 2. The high frequency current flows through the stepped portion 5 in the heating conductor 3. The high-frequency current flows in the circumferential direction of the object to be heated 4 along the curved pieces 9a to 9c of the stepped portion 5, and in a direction orthogonal to the curved piece (direction in which the straight line L extends) at the connection portion of each curved piece. Flowing. That is, the high-frequency current flows so as to be orthogonal to the circumferential direction indicated by the arrow B in FIG. 4C and the direction orthogonal to the circumferential direction indicated by the arrow C (the direction in which the straight line L in FIG. 2 extends).

ここで、被加熱物４が仮にねじであって、螺旋状のねじ山及びねじ底が湾曲片９ａ〜９ｃと４５度以下の角度で対向している場合には、螺旋状のねじ山及びねじ底は、各湾曲片の接続部における高周波電流の流れ（矢印Ｃで示す方向の流れ）に対して４５度以上１３５度以下の角度で対向する。よって、高周波電流の矢印Ｃで示す方向の流れによって、被加熱物４の表面にはねじ山からねじ底を経て別のねじ山へと誘導電流が励起される。その結果、ねじ底も誘導加熱され焼入れされる。   Here, if the object to be heated 4 is a screw and the spiral thread and the screw bottom face the curved pieces 9a to 9c at an angle of 45 degrees or less, the spiral thread and the screw The bottom faces the high-frequency current flow (flow in the direction indicated by arrow C) at the connection portion of each bending piece at an angle of 45 degrees or more and 135 degrees or less. Therefore, an induced current is excited on the surface of the object to be heated 4 from the screw thread through the screw bottom to another screw thread by the flow of the high-frequency current in the direction indicated by the arrow C. As a result, the screw bottom is also induction-heated and quenched.

また、被加熱物４がはすば歯車であって、歯筋が各湾曲片９ａ〜９ｃに対して４５度以上の角度で対向していると、各湾曲片９ａ〜９ｃを矢印Ｂ方向（円周方向）に流れる高周波電流によって被加熱物４の表面には歯先から歯元（歯底）を経て別の歯先へと誘導電流が励起される。その結果、はすば歯車の表面（歯筋）は、良好に焼入れされる。   In addition, when the object to be heated 4 is a helical gear and the tooth traces are opposed to the curved pieces 9a to 9c at an angle of 45 degrees or more, the curved pieces 9a to 9c are moved in the direction of arrow B ( An induction current is excited on the surface of the object to be heated 4 from the tooth tip to the other tooth tip via the tooth root (tooth bottom) by the high-frequency current flowing in the circumferential direction). As a result, the surface (tooth trace) of the helical gear is well quenched.

すなわち、図９に示すように、被加熱物４に近接した加熱導体３（段状部５）を流れる高周波電流２１によって、被加熱物４の表面には高周波誘導電流２２が励起される。高周波誘導電流２２は、被加熱物４の表面の凹凸を越えて流れ、その結果、符号４ａで示す表面からの深さの焼入れパターンが得られる。   That is, as shown in FIG. 9, a high-frequency induction current 22 is excited on the surface of the heated object 4 by the high-frequency current 21 flowing through the heating conductor 3 (stepped portion 5) close to the heated object 4. The high-frequency induction current 22 flows beyond the unevenness of the surface of the article 4 to be heated, and as a result, a quenching pattern having a depth from the surface indicated by reference numeral 4a is obtained.

このように、高周波加熱装置１０の加熱導体３に備えた段状部５では、高周波電流が被加熱物４の円周方向と、円周方向に対して直交する方向に流れるので、被加熱物４にどのような方向の筋（螺旋溝や歯筋等）が形成されていても、被加熱物４の凹部にも高周波誘導電流を励起させることができ、良好に焼入れすることができる。   In this way, in the stepped portion 5 provided in the heating conductor 3 of the high-frequency heating device 10, the high-frequency current flows in the circumferential direction of the object to be heated 4 and in the direction orthogonal to the circumferential direction. 4, any direction of the streak (such as a spiral groove or a tooth trace) can be excited in the concave portion of the article to be heated 4 and can be well quenched.

本実施の形態では、段状部５が３つの湾曲片９ａ〜９ｃで構成される場合を示したが、図５（ｂ），図５（ｃ）に示すように、４つ又は５つの湾曲片で段状部を構成してもよい。段状部は、被加熱物４の大きさ（特に半径）に応じて製造可能な数の湾曲片で構成するのが好ましい。すなわち、被加熱物４の半径が小さい場合には、湾曲片の数を増やすのは困難であり、２つの湾曲片で段状部を構成するのが好ましい。逆に、被加熱物４の半径が十分に大きい場合には、段状部を製造できる範囲で湾曲片の数を増やすこともできる。   In the present embodiment, the case where the stepped portion 5 is configured by three curved pieces 9a to 9c has been described. However, as illustrated in FIGS. 5B and 5C, four or five curved portions are provided. You may comprise a step-shaped part with a piece. The stepped portion is preferably composed of a number of curved pieces that can be manufactured according to the size (particularly the radius) of the article 4 to be heated. That is, when the radius of the object to be heated 4 is small, it is difficult to increase the number of curved pieces, and it is preferable to form a stepped portion with two curved pieces. Conversely, when the radius of the article to be heated 4 is sufficiently large, the number of curved pieces can be increased within a range in which the stepped portion can be manufactured.

図３〜図５では、各湾曲片９ａ〜９ｃが直に接続されて段状部５を形成する場合を示したが、各湾曲片９ａ〜９ｃの間に、別部材を配置することもできる。すなわち、図６，図７に示すように、湾曲片９ａの開口１３ａと、湾曲片９ｂの開口１３ｂの間に接続片１４ａを配置し、湾曲片９ｂの開口１３ａと湾曲片９ｃの開口１３ｂに接続片１４ｂを接続（蝋付け）して段状部１５を構成する。接続片１４ａ，１４ｂは、湾曲片９ａ等と同じ素材からなる四角柱状の中空管で構成されている。そして、接続片１４ａ，１４ｂは、各湾曲片９ａ〜９ｃと直交しており、直線Ｌ（図２）が延びる方向に段状部１５を拡張する。   Although FIGS. 3-5 showed the case where each curved piece 9a-9c was connected directly and formed the step-shaped part 5, another member can also be arrange | positioned between each curved piece 9a-9c. . That is, as shown in FIGS. 6 and 7, the connecting piece 14a is arranged between the opening 13a of the bending piece 9a and the opening 13b of the bending piece 9b, and the opening 13a of the bending piece 9b and the opening 13b of the bending piece 9c are arranged. The connecting portion 14b is connected (brazed) to form the stepped portion 15. The connecting pieces 14a and 14b are formed of a square columnar hollow tube made of the same material as the curved piece 9a and the like. And the connection pieces 14a and 14b are orthogonal to each curved piece 9a-9c, and expand the step part 15 in the direction where the straight line L (FIG. 2) extends.

すなわち、図７（ｂ）に示す段状部１５の矢印Ｃで示す方向（直線Ｌが延びる方向）の長さが、図３，図４に示す段状部５よりも接続片１４ａの長さ分だけ長くなっている。その結果、矢印Ｃ方向（軸方向）の高周波電流の流れる長さ（範囲）が大きくなる。よって、被加熱物４の表面に励起される矢印Ｃ方向（直線Ｌ方向）の高周波誘導電流が増大する。   That is, the length in the direction indicated by the arrow C of the stepped portion 15 shown in FIG. 7B (the direction in which the straight line L extends) is longer than the stepped portion 5 shown in FIGS. It is longer by minutes. As a result, the length (range) in which the high-frequency current flows in the arrow C direction (axial direction) is increased. Therefore, the high-frequency induced current in the direction of arrow C (straight line L direction) excited on the surface of the article 4 to be heated increases.

このように、段状部に３つの湾曲片がある場合には、２つの接続片１４ａ，１４ｂで各湾曲片を接続する。また、図８（ｂ）に示すように、湾曲片の数が４つ以上の場合にも、各湾曲片の間に接続片を配置して段状部を構成する。具体的には、湾曲片が４つの場合には、湾曲片９ａ〜９ｄの間に、各々接続片１４ａ〜１４ｃを配置する。   Thus, when there are three curved pieces in the stepped portion, the curved pieces are connected by the two connecting pieces 14a and 14b. Further, as shown in FIG. 8B, even when the number of curved pieces is four or more, connecting pieces are arranged between the curved pieces to form a stepped portion. Specifically, when there are four bending pieces, connecting pieces 14a to 14c are arranged between the bending pieces 9a to 9d, respectively.

上述の例では、各湾曲片の形状及び大きさを同じとしたが、各湾曲片の形状及び大きさを相違させ、各湾曲片を半径方向に連結させてもよい。また、段状部を図１０に示すように構成することもできる。   In the above-described example, the shape and size of each bending piece are the same, but the shape and size of each bending piece may be different and the bending pieces may be connected in the radial direction. Further, the stepped portion can be configured as shown in FIG.

図１０（ａ）では、図６（ａ）における湾曲片９ｂの代わりに湾曲片２０を用い、接続片１４ａ，１４ｂの代わりに接続片１７ａ，１７ｂを用いている。湾曲片２０と湾曲片９ｂとでは、開口を設ける位置が異なっている。   In FIG. 10A, the curved piece 20 is used instead of the curved piece 9b in FIG. 6A, and the connecting pieces 17a and 17b are used instead of the connecting pieces 14a and 14b. The bending piece 20 and the bending piece 9b are different in the positions where the openings are provided.

すなわち、湾曲片２０では、被加熱物と対向する側の側面２０ａの両端に各々開口２３ａ，２３ｂが設けられている。また、接続片１７ａ，１７ｂの外形は、接続片１４ａ，１４ｂの外形と同じであるが、開口の設け方が相違している。すなわち、接続片１７ａでは、隣接する面１８，１９に各々開口１８ａ，１９ａが形成されており、開口１８ａと開口１９ａとが連通している。同様に、接続片１７ｂにおいても、隣接する面２４，２５に各々開口２４ａ，２５ａが形成されており、各開口２４ａ，２５ａ同士が接続片１７ｂ内部で連通している。   That is, in the bending piece 20, openings 23a and 23b are provided at both ends of the side surface 20a on the side facing the object to be heated. Further, the outer shapes of the connection pieces 17a and 17b are the same as the outer shapes of the connection pieces 14a and 14b, but the way of providing the openings is different. That is, in the connection piece 17a, openings 18a and 19a are formed in adjacent surfaces 18 and 19, respectively, and the opening 18a and the opening 19a communicate with each other. Similarly, in the connection piece 17b, openings 24a and 25a are formed in adjacent surfaces 24 and 25, respectively, and the openings 24a and 25a communicate with each other inside the connection piece 17b.

そして、次のように各部材を接続し、段状部２６を組み立てる。
湾曲片９ａの開口１３ａに、接続片１７ａの開口１８ａを位置合わせし、湾曲片９ａの側面１２ａに接続片１７ａの面１８を固着する。接続片１７ａの開口１９ａに、湾曲片２０の開口２３ａを位置合わせし、接続片１７ａの面１９と湾曲片２０の側面２０ａとを固着する。また、湾曲片２０の開口２３ｂと接続片１７ｂの開口２４ａとを位置合わせし、側面２０ａに接続片１７ｂの面２４を固着する。最後に、接続片１７ｂの開口２５ａと湾曲片９ｃの開口１３ｂ（開口１３ａとは反対側の側面１２ｂに設けた開口）とを位置合わせし、接続片１７ｂの面２５を湾曲片９ｃの側面１２ｂに固着する。その結果、図１０（ｂ）に示すような段状部２６が構成される。段状部２６は、湾曲片９ａと９ｃが同一半径であって、被加熱物に近接配置され、湾曲片２０は接続片１７ａ，１７ｂの厚みの分だけ余計に湾曲片９ａ，９ｂよりも被加熱物から離間して配置される。 And each member is connected as follows and the step part 26 is assembled.
The opening 18a of the connection piece 17a is aligned with the opening 13a of the bending piece 9a, and the surface 18 of the connection piece 17a is fixed to the side surface 12a of the bending piece 9a. The opening 23a of the bending piece 20 is aligned with the opening 19a of the connecting piece 17a, and the surface 19 of the connecting piece 17a and the side surface 20a of the bending piece 20 are fixed. Further, the opening 23b of the bending piece 20 and the opening 24a of the connection piece 17b are aligned, and the surface 24 of the connection piece 17b is fixed to the side surface 20a. Finally, the opening 25a of the connection piece 17b and the opening 13b of the bending piece 9c (the opening provided on the side surface 12b opposite to the opening 13a) are aligned, and the surface 25 of the connection piece 17b is aligned with the side surface 12b of the bending piece 9c. It sticks to. As a result, a stepped portion 26 as shown in FIG. The stepped portion 26 has the curved pieces 9a and 9c having the same radius and is arranged close to the object to be heated, and the curved piece 20 is covered more than the curved pieces 9a and 9b by the thickness of the connection pieces 17a and 17b. It arrange | positions away from a heating thing.

すなわち、各湾曲片と接続片とを、被加熱物の径方向及び軸方向に適宜組み合わせて段状部を構成することができる。   That is, the stepped portion can be configured by appropriately combining the curved pieces and the connecting pieces in the radial direction and the axial direction of the object to be heated.

図示した各湾曲片の開口と各接続片の開口の形状は四角形状となっているが、開口は丸形状であっても差し支えない。すなわち、中空の加熱導体の内部通路の横断面の形状が四角形であっても、各開口の形状は丸形状であっても差し支えない。   The shape of the opening of each curved piece and the opening of each connection piece shown in the figure is a square shape, but the opening may be a round shape. That is, even if the shape of the cross section of the internal passage of the hollow heating conductor is a quadrangle, the shape of each opening may be a round shape.

また、図３，図６，図１０に示す段状部５，１５，２６は、いずれも湾曲片（９ａ等）が連結された構造を有しているが、代わりに図１１に示すような段状部２７を採用することもできる。段状部２７は、３つの直線形状の分割片２８ａ〜２８ｃの端部同士が、紙面の奥側から手前側に段状に連結されている。分割片２８ａ〜２８ｃは中空であり、両端が閉鎖され、側面には開口２９（一端側），３０（他端側）が設けられている。   Further, each of the stepped portions 5, 15, and 26 shown in FIGS. 3, 6, and 10 has a structure in which curved pieces (9a, etc.) are connected, but instead as shown in FIG. A stepped portion 27 can also be employed. In the stepped portion 27, the ends of the three linear divided pieces 28a to 28c are connected in a stepped manner from the back side to the near side of the drawing. The divided pieces 28a to 28c are hollow, both ends are closed, and openings 29 (one end side) and 30 (the other end side) are provided on the side surfaces.

すなわち、分割片２８ａの端部３１（一端側）に設けられた開口２９が、図２等に示す直線部６ｂに接続され、分割片２８ａの端部３２（他端側）に設けられた開口３０（図示せず）と分割片２８ｂの端部３３に設けられた開口２９（図示せず）とが接続され、分割片２８ｂの端部３４に設けられた開口３０と分割片２８ｃの端部３５に設けられた開口２９とが接続され、分割片２８ｃの端部３６に設けられた開口３０が、図２等に示す直線部６ｃと接続される。   That is, the opening 29 provided at the end portion 31 (one end side) of the divided piece 28a is connected to the straight portion 6b shown in FIG. 2 and the like, and the opening provided at the end portion 32 (other end side) of the divided piece 28a. 30 (not shown) and an opening 29 (not shown) provided at the end 33 of the split piece 28b are connected, and the opening 30 provided at the end 34 of the split piece 28b and the end of the split piece 28c. The opening 29 provided in 35 is connected, and the opening 30 provided in the end 36 of the split piece 28c is connected to the straight portion 6c shown in FIG.

図１１に示すように各分割片２８ａ〜２８ｃは、可能な限り被加熱物４の設置位置に沿って配置されるように、互いに適宜所定の角度を成して接続される。   As shown in FIG. 11, the divided pieces 28 a to 28 c are connected to each other at an appropriate angle so as to be arranged along the installation position of the article to be heated 4 as much as possible.

１ 高周波電源
２ トランス
３ 加熱導体
４ 被加熱物
５ 段状部
６ａ〜６ｄ 直線部
７ａ〜７ｄ 円周部
８ａ，８ｂ リード部
９ａ〜９ｃ 湾曲片（分割片）
１０ 高周波加熱装置
１４ａ，１４ｂ 接続片
２８ａ〜２８ｃ 直線状の分割片 DESCRIPTION OF SYMBOLS 1 High frequency power supply 2 Transformer 3 Heating conductor 4 Heated object 5 Step part 6a-6d Straight part 7a-7d Circumferential part 8a, 8b Lead part 9a-9c Curved piece (divided piece)
10 High-frequency heating devices 14a and 14b Connection pieces 28a to 28c Linear divided pieces

Claims (3)

被加熱物を高周波誘導加熱する高周波加熱装置の加熱導体において、
前記加熱導体は複数の分割片を有しており、
誘導加熱時における被加熱物の設置位置に沿って、前記各分割片が段状に連結されていることを特徴とする高周波加熱装置の加熱導体。 In the heating conductor of the high-frequency heating device that heats the object to be heated at high frequency,
The heating conductor has a plurality of divided pieces,
A heating conductor of a high-frequency heating device, wherein each of the divided pieces is connected in a step shape along an installation position of an object to be heated during induction heating. 前記各分割片が、同一半径又は略同一半径の円弧状であることを特徴とする請求項１に記載の高周波加熱装置の加熱導体。   The heating conductor of the high-frequency heating device according to claim 1, wherein each of the divided pieces has an arc shape having the same radius or substantially the same radius. 各分割片の端部同士が直に連結される部分を有することを特徴とする請求項１又は請求項２に記載の高周波加熱装置の加熱導体。   The heating conductor of the high-frequency heating device according to claim 1 or 2, wherein the end portions of the divided pieces have a portion directly connected to each other.
JP2010286877A 2010-12-24 2010-12-24 Heating conductor for high frequency heating device Pending JP2012134080A (en)

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CN106216679A (en) * 2016-08-30 2016-12-14 江苏共昌轧辊股份有限公司 A kind of U-shaped medium frequency induction heater of reaction-injection moulding lithosomic body
JP2019087508A (en) * 2017-11-10 2019-06-06 富士電子工業株式会社 Induction heating coil for helical gear
KR20200062838A (en) * 2018-11-27 2020-06-04 이현철 Induction heating head for gear

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JPH11162626A (en) * 1997-11-27 1999-06-18 High Frequency Heattreat Co Ltd Induction heating coil for integrally quenching gear mounted to shaft
JP2002194425A (en) * 2000-12-26 2002-07-10 Denki Kogyo Co Ltd Induction heating coil

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US4251707A (en) * 1979-08-09 1981-02-17 Park-Ohio Industries, Inc. Inductor for axially and circumferentially heating a rotating workpiece
JPH11162626A (en) * 1997-11-27 1999-06-18 High Frequency Heattreat Co Ltd Induction heating coil for integrally quenching gear mounted to shaft
JP2002194425A (en) * 2000-12-26 2002-07-10 Denki Kogyo Co Ltd Induction heating coil

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106216679A (en) * 2016-08-30 2016-12-14 江苏共昌轧辊股份有限公司 A kind of U-shaped medium frequency induction heater of reaction-injection moulding lithosomic body
JP2019087508A (en) * 2017-11-10 2019-06-06 富士電子工業株式会社 Induction heating coil for helical gear
JP7082786B2 (en) 2017-11-10 2022-06-09 富士電子工業株式会社 Induction heating coil for helical gears
KR20200062838A (en) * 2018-11-27 2020-06-04 이현철 Induction heating head for gear
KR102134976B1 (en) 2018-11-27 2020-07-16 이현철 Induction heating head for gear

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