JP6726472B2 - Induction heating coil - Google Patents

Induction heating coil Download PDF

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JP6726472B2
JP6726472B2 JP2016025890A JP2016025890A JP6726472B2 JP 6726472 B2 JP6726472 B2 JP 6726472B2 JP 2016025890 A JP2016025890 A JP 2016025890A JP 2016025890 A JP2016025890 A JP 2016025890A JP 6726472 B2 JP6726472 B2 JP 6726472B2
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plane
flat surface
heating unit
surface heating
inclined surface
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JP2017147041A (en
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彰 宇田川
彰 宇田川
潤二 己之上
潤二 己之上
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富士電子工業株式会社
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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
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Description

本発明は、鉄鋼材料を高周波誘導加熱するための誘導加熱コイルに関するものであり、特に、工作機械のベッド等のアリ溝に係合するアリ状突起を有するワークを高周波誘導加熱する誘導加熱コイルに関するものである。 TECHNICAL FIELD The present invention relates to an induction heating coil for high-frequency induction heating of a steel material, and more particularly to an induction heating coil for high-frequency induction heating a work having a dovetail projection that engages with a dovetail groove of a machine tool or the like. It is a thing.

工作機械等の摺動部の構造として、アリ溝とアリ状突起部材の組み合わせがある。アリ状突起部材の摺動面は摩耗し易いため、従来から焼入によって耐摩耗性や強度の向上が図られている。このようなアリ状突起部材の摺動面を誘導加熱する高周波焼入コイルが例えば特許文献１に開示されている。 As a structure of a sliding portion of a machine tool or the like, there is a combination of a dovetail groove and a dovetail projection member. Since the sliding surface of the dovetail-shaped projection member is easily worn, quenching has conventionally been performed to improve wear resistance and strength. For example, Patent Document 1 discloses an induction hardening coil that induction-heats the sliding surface of such a dovetail projection member.

特許文献１に開示された高周波焼入コイル８０は、一続きの中空の導体で構成されており、図１２、図１３に示す様な形状を呈している。図１２、図１３は、特許文献１の図３及び図２から主要部分を書き起こしたものである。 The induction hardening coil 80 disclosed in Patent Document 1 is composed of a continuous hollow conductor and has a shape as shown in FIGS. 12 and 13. 12 and 13 are transcripts of the main part from FIGS. 3 and 2 of Patent Document 1.

焼入対象部材９０（ワーク）は、平坦面９１を有し、平坦面９１上に突条のアリ９２（アリ状突起）が設けられている。アリ９２は、平坦面９１と連続し、平坦面９１に対して傾斜した斜面９３を有している。 The quenching target member 90 (workpiece) has a flat surface 91, and a projection dovetail 92 (a dove-shaped projection) is provided on the flat surface 91. The ant 92 has a slope 93 that is continuous with the flat surface 91 and that is inclined with respect to the flat surface 91.

高周波焼入コイル８０は、図１３に示す様に、焼入対象部材９０の平坦面９１に近接対向する平坦面加熱部８１ａ，８１ｂと、アリ９２の斜面９３に近接対向する斜面加熱部８２ａ，８２ｂを有している。 As shown in FIG. 13, the induction hardening coil 80 includes flat surface heating portions 81a and 81b that closely face the flat surface 91 of the hardening target member 90 and slope heating portions 82a and 82a that closely face the slope surface 93 of the ant 92. 82b.

図１２に示す様に、平坦面加熱部８１ａ，８１ｂは、直線状であって互いに平行であり、連結部８３を介して接続されている。平坦面加熱部８１ａは斜面加熱部８２ａと連続しており、平坦面加熱部８１ｂは斜面加熱部８２ｂと連続している。斜面加熱部８２ａ，８２ｂは、直線状であって互いに平行であり、平坦面加熱部８１ａ，８１ｂに対して鋭角（焼入対象部材９０の平坦面９１と斜面９３が成す角度と同じ角度）に傾斜して接続されている。 As shown in FIG. 12, the flat surface heating parts 81 a and 81 b are linear and parallel to each other, and are connected via a connecting part 83. The flat surface heating unit 81a is continuous with the slope heating unit 82a, and the flat surface heating unit 81b is continuous with the slope heating unit 82b. The slope heating parts 82a and 82b are linear and parallel to each other, and are at an acute angle (the same angle as the angle formed between the flat surface 91 and the slope 93 of the hardening target member 90) with respect to the flat surface heating parts 81a and 81b. Connected at an angle.

また、斜面加熱部８２ａ，８２ｂは、その他の導体部分を介して各々リード部８４ａ，８４ｂと接続されている。さらに、平坦面加熱部８１ａ，８１ｂの間、及び斜面加熱部８２ａ，８２ｂの間には、図１３に示す様に、フェライトコア８５が配置されている。 The slope heating parts 82a and 82b are connected to the lead parts 84a and 84b through other conductor parts, respectively. Further, as shown in FIG. 13, a ferrite core 85 is arranged between the flat surface heating portions 81a and 81b and between the slope surface heating portions 82a and 82b.

平坦面加熱部８１ａ（８１ｂ）と斜面加熱部８２ａ（８２ｂ）の鋭角に接続された部分が、焼入対象部材９０の平坦面９１と斜面９３の接続部（交差部）である基部９４に近接する。 A portion of the flat surface heating portion 81a (81b) and the slope heating portion 82a (82b) that are connected at an acute angle is close to a base portion 94 that is a connecting portion (intersection portion) of the flat surface 91 and the slope surface 93 of the hardening target member 90. To do.

特許文献１では、この様な高周波焼入コイル８０に、リード部８４ａ，８４ｂを介して図示しない高周波電源から高周波電流を供給すると、焼入対象部材９０の平坦面９１と斜面９３を同時に誘導加熱することができるとされている。 In Patent Document 1, when a high-frequency current is supplied to such an induction hardening coil 80 from a high-frequency power source (not shown) via the leads 84a and 84b, the flat surface 91 and the slope 93 of the hardening target member 90 are simultaneously induction-heated. It is supposed to be possible.

実開平６−６４４９号公報Japanese Utility Model Publication No. 6-6449

ところで、焼入対象部材９０を高周波焼入する際には、焼入対象部材９０と高周波焼入コイル８０とを相対移動させるいわゆる移動焼きが行われる。すなわち、焼入対象部材９０の焼入対象部位（平坦面９１，斜面９３）は、長手方向（図１３において紙面に直交する方向）の全領域に渡って同時に焼入されるのではなく、高周波焼入コイル８０が、焼入対象部材９０の焼入対象部位に部分的に順次対向し、部分的に高周波焼入を実施しながら焼入対象部材９０の長手方向に移動する。
そのため、この移動焼きでは、焼入対象部位の全領域を同時に高周波誘導加熱する場合よりも、高周波焼入コイル８０に高周波電流が通電される時間が必然的に長くなる。その結果、フェライトコア８５に掛かる負担が大きくなり、フェライトコア８５の劣化・破損等によって焼入品質に悪影響を及ぼす懸念がある。 By the way, when performing induction hardening of the hardening target member 90, so-called moving hardening is performed in which the hardening target member 90 and the induction hardening coil 80 are relatively moved. That is, the quenching target portion (flat surface 91, slope 93) of the quenching target member 90 is not simultaneously quenched over the entire region in the longitudinal direction (direction orthogonal to the paper surface in FIG. 13), but high frequency The hardening coil 80 partially opposes the hardening target portion of the hardening target member 90 sequentially, and moves in the longitudinal direction of the hardening target member 90 while partially performing induction hardening.
Therefore, in this moving quenching, the time during which the high frequency current is passed through the high frequency quenching coil 80 is inevitably longer than in the case where the entire region of the quenching target site is simultaneously subjected to the high frequency induction heating. As a result, the load on the ferrite core 85 increases, and there is a concern that the deterioration and damage of the ferrite core 85 may adversely affect the quenching quality.

そこで本発明は、工作機械のベッド等に形成されたアリ溝に沿って移動するワークの基礎平面と、基礎平面に設けられたアリ溝に係合するアリ状突起の斜面を均一に誘導加熱することができる誘導加熱コイルを、フェライトコアを使用せずに実現することを課題としている。 Therefore, the present invention uniformly induces and heats the basic plane of the workpiece that moves along the dovetail groove formed in the bed of the machine tool and the slope of the dovetail projection that engages the dovetail groove provided in the basic plane. The object is to realize an induction heating coil that can be used without using a ferrite core.

上記課題を解決するための請求項１に記載の発明は、基礎平面と、当該基礎平面から鋭角且つオーバーハング状に傾斜する傾斜平面を有するワークのアリ状突起を誘導加熱する誘導加熱コイルにおいて、基礎平面に近接させる平面加熱部と、傾斜平面に近接させる傾斜面加熱部を有し、傾斜面加熱部の正面形状は、上辺部，下辺部，接続辺部が直列に接続されたものであって各辺部によって囲まれる平面を構成し、平面加熱部は、一定の間隔をあけて配置された二以上の直線部を有し、当該直線部が電気的に直列に接続されており、前記二以上の直線部によって囲まれる平面を構成し、前記平面加熱部の一端が傾斜面加熱部の下辺部の一端に電気的に接続されていて前記平面加熱部と傾斜面加熱部が一連の直列回路を構成し、傾斜面加熱部が構成する平面は、平面加熱部が構成する平面に対して鋭角に傾斜する姿勢となっており、前記誘導加熱コイルの有効幅は、前記ワークのアリ状突起の全長よりも短く、ワークの昇温に寄与する平面加熱部の有効幅は、ワークの昇温に寄与する傾斜面加熱部の有効幅よりも狭く、前記誘導加熱コイルは、ワークの前記二つの平面に沿って相対移動しながら二つの平面の焼入対象範囲の全領域に順に近接対向するものであり、平面加熱部と傾斜面加熱部のワークに対する相対移動方向後方の端部は、実質的に一致していることを特徴とする誘導加熱コイルである。
関連する発明は、基礎平面と、当該基礎平面から鋭角且つオーバーハング状に傾斜する傾斜平面を有するワークのアリ状突起を誘導加熱する誘導加熱コイルにおいて、基礎平面に近接させる平面加熱部と、傾斜平面に近接させる傾斜面加熱部を有し、傾斜面加熱部の正面形状は、上辺部，下辺部，接続辺部が直列に接続されたものであって各辺部によって囲まれる平面を構成し、平面加熱部は、一定の間隔をあけて配置された二以上の直線部を有し、当該直線部が電気的に直列に接続されており、前記二以上の直線部によって囲まれる平面を構成し、前記平面加熱部の一端が傾斜面加熱部の下辺部の一端に電気的に接続されていて前記平面加熱部と傾斜面加熱部が一連の直列回路を構成し、傾斜面加熱部が構成する平面は、平面加熱部が構成する平面に対して鋭角に傾斜する姿勢となっていることを特徴とする誘導加熱コイルである。 The invention according to claim 1 for solving the above-mentioned problems is an induction heating coil for induction heating a dovetail projection of a work having a basic plane and an inclined plane inclined at an acute angle and an overhang from the basic plane, It has a plane heating part that is close to the basic plane and a slope heating part that is close to the inclined plane. The front shape of the slope heating part is that the upper side part, the lower side part, and the connecting side part are connected in series. A plane surrounded by each side portion, the plane heating portion has two or more straight line portions arranged at regular intervals, and the straight line portions are electrically connected in series, and A plane surrounded by two or more straight line portions is formed, one end of the plane heating unit is electrically connected to one end of the lower side of the inclined surface heating unit, and the plane heating unit and the inclined surface heating unit are connected in series. The plane that constitutes the circuit and that is formed by the inclined surface heating unit has a posture that is inclined at an acute angle with respect to the plane that is formed by the flat surface heating unit, and the effective width of the induction heating coil is the dovetail protrusion of the workpiece. Is shorter than the entire length of the flat heating part that contributes to the temperature rise of the work, the effective width of the inclined surface heating part that contributes to the temperature rise of the work is narrower, the induction heating coil, While moving relative to each other along the plane, the two areas of the flat surface are in close proximity to each other in the entire quenching target area in order. The induction heating coil is characterized in that
A related invention is an induction heating coil that induction-heats a dovetail protrusion of a work having a base plane and an inclined plane that is inclined at an acute angle and an overhang shape from the base plane. It has an inclined surface heating section that is close to a flat surface, and the front shape of the inclined surface heating section is such that an upper side portion, a lower side portion, and a connecting side portion are connected in series, and a plane surrounded by each side portion is formed. The plane heating unit has two or more straight line portions arranged at regular intervals, the straight line portions are electrically connected in series, and a plane surrounded by the two or more straight line portions is configured. Then, one end of the flat surface heating unit is electrically connected to one end of the lower side portion of the inclined surface heating unit, and the flat surface heating unit and the inclined surface heating unit form a series of series circuits, and the inclined surface heating unit is formed. The plane to be heated is an induction heating coil characterized in that it has an attitude inclined at an acute angle with respect to the plane formed by the plane heating unit.

請求項１に記載の発明では、誘導加熱コイルは、平面加熱部と傾斜面加熱部を有している。そして、平面加熱部でワークの基礎平面を誘導加熱することができ、傾斜面加熱部で傾斜平面を誘導加熱することができる。
傾斜面加熱部の正面形状は、上辺部と、下辺部と、接続辺部が直列に接続されたものであって各辺部によって囲まれた平面を構成するので、ワークの傾斜平面における傾斜面加熱部が対向する部位には密集した交番磁界の磁束が通過し易く、当該部位は良好に誘導加熱される。
平面加熱部は、一定の間隔をあけて配置された二以上の直線部を有し、当該直線部が電気的に直列に接続されており、これらの直線部によって囲まれる平面を構成するので、ワークの基礎平面における平面加熱部が対向する部位には密集した交番磁界の磁束が通過し易く、当該部位は良好に誘導加熱される。
平面加熱部の一端が傾斜面加熱部の下辺部の一端に電気的に接続されていて、平面加熱部と傾斜面加熱部が一連の直列回路を構成しているので、誘導加熱コイルの平面加熱部と傾斜面加熱部がワークに対向すると、ワークの基礎平面と傾斜平面には、同時に同程度の高周波誘導電流が励起される。
傾斜面加熱部が構成する平面は、平面加熱部が構成する平面に対して鋭角に傾斜する姿勢となっているので、平面加熱部と傾斜面加熱部がワークの基礎平面と傾斜平面に同時に対向し易い。
本発明によると、誘導加熱コイルにフェライトコアを設けなくても、基礎平面と傾斜平面に十分な高周波誘導電流を励起させることができる。 In the invention according to claim 1, the induction heating coil has a flat surface heating portion and an inclined surface heating portion. Then, the flat surface heating unit can induction-heat the basic flat surface of the work, and the inclined surface heating unit can induction-heat the inclined flat surface.
The front shape of the inclined surface heating unit is such that the upper side portion, the lower side portion, and the connecting side portion are connected in series to form a plane surrounded by the respective side portions, so that the inclined surface in the inclined plane of the workpiece The dense magnetic flux of the alternating magnetic field easily passes through the portion facing the heating portion, and the portion is well induction-heated.
The flat surface heating unit has two or more straight line portions arranged at a constant interval, the straight line portions are electrically connected in series, and a plane surrounded by these straight line portions is formed. A dense magnetic flux of an alternating magnetic field easily passes through a portion of the basic plane of the workpiece which the flat heating portion faces, and the portion is well induction-heated.
Since one end of the flat surface heating unit is electrically connected to one end of the lower side of the inclined surface heating unit, and the flat surface heating unit and the inclined surface heating unit form a series of series circuits, the flat surface heating of the induction heating coil is performed. When the heating section and the inclined surface heating section face the work, the same level of high frequency induction current is simultaneously excited in the basic plane and the inclined plane of the work.
Since the plane formed by the inclined surface heating section is inclined at an acute angle with respect to the plane formed by the planar heating section, the planar heating section and the inclined surface heating section face the work basic plane and the inclined plane at the same time. Easy to do.
According to the present invention, it is possible to excite a sufficient high-frequency induction current in the basic plane and the inclined plane without providing the induction heating coil with the ferrite core.

請求項２に記載の発明は、傾斜面加熱部の正面形状は二以上の下辺部と、二以上の上辺部と、三以上の接続辺部によって構成され、前記下辺部の一端と上辺部の一端が前記接続辺部で接続されていて前記二以上の下辺部と、二以上の上辺部と、三以上の接続辺部が直列に接続されたものであって各辺部によって囲まれる平面を構成し、平面加熱部の一端が傾斜面加熱部の一つの下辺部の一端に電気的に接続されてい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 front surface shape of the inclined surface heating unit is composed of two or more lower side portions, two or more upper side portions, and three or more connecting side portions, and one end of the lower side portion and the upper side portion are formed. One end is connected by the connecting side portion, the two or more lower side portions, two or more upper side portions, and three or more connecting side portions are connected in series, a plane surrounded by each side portion. The induction heating coil according to claim 1, wherein one end of the flat heating portion is electrically connected to one end of one lower side portion of the inclined surface heating portion.

請求項２に記載の発明では、傾斜面加熱部の正面形状は、二以上の下辺部と、二以上の上辺部と、三以上の接続辺部が直列に接続されたものであって各辺によって囲まれた平面を構成するので、ワークの傾斜平面における傾斜面加熱部が対向する部位には密集した交番磁界の磁束が通過し易く、当該部位は良好に誘導加熱される。
そして、平面加熱部の一端が傾斜面加熱部の一つの下辺部の一端に電気的に接続されているので、ワークの基礎平面と傾斜平面には同時に誘導電流が励起されて、同時に誘導加熱される。その結果、基礎平面と傾斜平面には良好な焼入硬化層が形成される。
具体的には、以下の様である。
平面加熱部と傾斜面加熱部は、所定の領域を囲う平面を構成している。
誘導加熱コイルに高周波電流が供給されると、平面加熱部と傾斜面加熱部の各平面には密集した交番磁界の磁束が良好に発生し、この密集した交番磁界の磁束がワークの基礎平面と傾斜平面を通過する。そのため、ワークの基礎平面と傾斜平面に、高周波誘導電流を良好に励起させることができる。その結果、基礎平面と傾斜平面を同程度に誘導加熱し、同程度の焼入硬化層を形成することが可能である。 In the invention according to claim 2, the front surface shape of the inclined surface heating part has two or more lower side parts, two or more upper side parts, and three or more connecting side parts connected in series, and each side Since the plane surrounded by the above is constituted, the magnetic flux of the dense alternating magnetic field easily passes through the portion of the inclined flat surface of the workpiece where the inclined surface heating portion faces, and the portion is well induction-heated.
Since one end of the flat surface heating unit is electrically connected to one end of one lower side of the inclined surface heating unit, an induced current is simultaneously excited in the base plane and the inclined plane of the work, and the induction heating is performed at the same time. It As a result, a good quench hardening layer is formed on the basic plane and the inclined plane .
Specifically, it is as follows.
The plane heating section and the inclined surface heating section form a plane surrounding a predetermined region.
When a high-frequency current is supplied to the induction heating coil, magnetic flux of a dense alternating magnetic field is well generated on each plane of the plane heating unit and the inclined surface heating unit. Pass through an inclined plane. Therefore, the high frequency induction current can be favorably excited on the basic plane and the inclined plane of the work. As a result, the basic plane and the inclined plane can be induction-heated to the same degree and the quench-hardened layer can be formed to the same degree.

工作機械のベッド等のアリ溝に係合するワークのアリ状突起は、通常は、アリ状突起の傾斜平面の端辺から傾斜平面と基礎平面が交差する交差部までの距離が、基礎平面の端辺から傾斜平面と基礎平面が交差する交差部までの距離よりも短い。
そのため、傾斜平面に近接対向する傾斜面加熱部の対向面積は、基礎平面に近接対向する平面加熱部の対向面積よりも小さくなり、傾斜平面の誘導加熱が不十分になるか、又は基礎平面の誘導加熱が過剰になり易い。
しかし請求項１に係る発明では、ワークの昇温に寄与する平面加熱部の有効幅は、ワークの昇温に寄与する傾斜面加熱部の有効幅よりも狭いので、両加熱部のワークに対する対向面積の差が小さくなり、基礎平面と平面加熱部の誘導加熱量の差が小さくなる。その結果、基礎平面と傾斜平面を同様に昇温させることができる。換言すると、傾斜面加熱部と平面加熱部のコイル効率（加熱効率）の差が小さくなり、ワークの傾斜面と基礎平面の昇温の仕方の差が小さくなる。
そして、平面加熱部と傾斜面加熱部のワークに対する相対移動方向後方の端部が実質的に一致しているので、基礎平面の誘導加熱と、傾斜平面の誘導加熱が同時に終了する。そのため、同時に冷却を開始することができる。すなわち、平面加熱部と傾斜面加熱部の冷却を開始する時期が一致するので、基礎平面と傾斜平面を同様に良好に焼入することができる。 The dovetail projection of a workpiece that engages with the dovetail groove of a machine tool bed or the like is usually the distance from the end side of the inclined plane of the dovetail projection to the intersection of the inclined plane and the base plane to the base plane. It is shorter than the distance from the edge to the intersection where the inclined plane and the basic plane intersect.
Therefore, the facing area of the inclined surface heating portion that closely faces the inclined flat surface becomes smaller than the facing area of the flat surface heating portion that closely faces the basic flat surface, and the induction heating of the inclined flat surface becomes insufficient, or Induction heating tends to be excessive.
However, in the invention according to claim 1 , since the effective width of the flat surface heating section that contributes to the temperature rise of the work is narrower than the effective width of the inclined surface heating section that contributes to the temperature rise of the work, both heating sections face each other with respect to the work. The difference in area becomes small, and the difference in the amount of induction heating between the basic plane and the plane heating unit becomes small. As a result, the basic plane and the inclined plane can be similarly heated. In other words, the difference in coil efficiency (heating efficiency) between the inclined surface heating unit and the flat surface heating unit becomes small, and the difference in the way of heating between the inclined surface of the work and the base plane becomes small.
Then, since the end portions of the flat surface heating portion and the inclined surface heating portion at the rear side in the relative movement direction with respect to the work substantially coincide with each other, the induction heating of the basic plane and the induction heating of the inclined plane are completed at the same time. Therefore, cooling can be started at the same time. That is, since the cooling start times of the flat surface heating unit and the inclined surface heating unit coincide with each other, the base plane and the inclined plane can be similarly well quenched.

傾斜面加熱部は三つの接続辺部を有しており、平面加熱部は二つの直線部を有しているのが好ましい（請求項３）。
また、請求項４に記載の発明は、基礎平面と、当該基礎平面から鋭角且つオーバーハング状に傾斜する傾斜平面を有するワークのアリ状突起を誘導加熱する誘導加熱コイルにおいて、基礎平面に近接させる平面加熱部と、傾斜平面に近接させる傾斜面加熱部を有し、前記誘導加熱コイルの有効幅は、前記ワークのアリ状突起の全長よりも短く、ワークの昇温に寄与する平面加熱部の有効幅は、ワークの昇温に寄与する傾斜面加熱部の有効幅よりも狭く、前記誘導加熱コイルは、ワークの前記二つの平面に沿って相対移動しながら二つの平面の焼入対象範囲の全領域に順に近接対向するものであり、平面加熱部と傾斜面加熱部のワークに対する相対移動方向後方の端部は、実質的に一致していることを特徴とする誘導加熱コイルである。 It is preferable that the inclined surface heating portion has three connecting side portions and the flat surface heating portion has two linear portions (claim 3 ).
Further, in the invention according to claim 4, in an induction heating coil for induction heating a dovetail projection of a work having a base plane and an inclined plane inclined at an acute angle and an overhang from the base plane, the induction heating coil is brought close to the base plane. It has a flat surface heating unit and a flat surface heating unit which is close to an inclined flat surface, and the effective width of the induction heating coil is shorter than the entire length of the dovetail projection of the work, and the flat surface heating unit contributing to the temperature rise of the work. The effective width is narrower than the effective width of the inclined surface heating section that contributes to the temperature rise of the work, the induction heating coil of the hardening target range of the two planes while relatively moving along the two planes of the work. The induction heating coil is arranged so as to face each other in close proximity to all the regions in order, and the rear end portions of the flat surface heating portion and the inclined surface heating portion in the relative movement direction with respect to the work substantially coincide with each other.

本発明の誘導加熱コイルによると、フェライトコアを設けなくても、基礎平面と傾斜平面に十分な高周波誘導電流を励起させることができる。 According to the induction heating coil of the present invention, it is possible to excite a sufficient high frequency induction current in the basic plane and the inclined plane without providing the ferrite core.

本発明の実施形態に係る誘導加熱コイルの斜視図である。It is a perspective view of the induction heating coil which concerns on embodiment of this invention. 図１の誘導加熱コイルを、図１とは別の方向から見た斜視図である。It is the perspective view which looked at the induction heating coil of Drawing 1 from the direction different from Drawing 1. 図１，図２とは別の方向から見た誘導加熱コイルの斜視図である。It is a perspective view of the induction heating coil seen from the direction different from FIG. 1 and FIG. 図３に示す誘導加熱コイルを斜め下方から見た斜視図である。It is the perspective view which looked at the induction heating coil shown in Drawing 3 from the slanting lower part. 図１に示す誘導加熱コイルを斜め下方から見た斜視図である。It is the perspective view which looked at the induction heating coil shown in FIG. 1 from diagonally downward. 図１の誘導加熱コイルを、ワークに近接対向させた状態を示す斜視図である。It is a perspective view which shows the state which made the induction heating coil of FIG. 1 closely face the work. ワークの側面図である。It is a side view of a work. ワークの側面図であり、図６のＢ−Ｂ矢視図である。It is a side view of a workpiece|work, It is a BB arrow line view of FIG. 図１の誘導加熱コイルで誘導加熱されたワークの焼入硬化層を示すと共に、当該誘導加熱コイルをワークにおける誘導加熱されていない側に配置した状態を示す側面図である。It is a side view which shows the quench-hardening layer of the work induction-heated by the induction heating coil of FIG. 図１とは別の誘導加熱コイルを、斜め下方から見た斜視図である。It is the perspective view which looked at the induction heating coil different from FIG. 1 from diagonally downward. （ａ）は、図１の誘導加熱コイルによってワークを誘導加熱した結果、ワークの基礎平面に形成された焼入硬化層の一例を示す側面図であり、（ｂ）は、図１０の誘導加熱コイルによってワークを誘導加熱した結果、ワークの基礎平面に形成された焼入硬化層を示す側面図である。(A) is a side view showing an example of a quench hardening layer formed on the basic plane of the work as a result of induction heating the work by the induction heating coil of FIG. 1, and (b) is an induction heating of FIG. 10. It is a side view which shows the quench-hardened layer formed in the basic plane of a work as a result of induction-heating a work by a coil. 特許文献１の高周波焼入コイルの斜視図である。It is a perspective view of the induction hardening coil of patent document 1. 図１２の高周波焼入コイルが近接対向したワークの部分側面図である。FIG. 13 is a partial side view of the work piece in which the induction hardening coils of FIG. 12 closely face each other.

以下、図面を参照しながら説明する。
図１〜図５に示す誘導加熱コイル１は、直列構造を有しており、一続きの良導体が適宜湾曲、又は屈曲して構成されているか、又は複数の良導体がろう付けによって一続きに接合されて構成されている。誘導加熱コイル１を構成する良導体は中空であり、誘導加熱コイル１の内部には連続した冷却液通路が形成されている。この冷却液通路には、冷却液を循環供給することができる。 Hereinafter, description will be given with reference to the drawings.
The induction heating coil 1 shown in FIG. 1 to FIG. 5 has a series structure, and a series of good conductors is appropriately curved or bent, or a plurality of good conductors are joined together by brazing. Is configured. A good conductor forming the induction heating coil 1 is hollow, and a continuous cooling liquid passage is formed inside the induction heating coil 1. The cooling liquid can be circulated and supplied to the cooling liquid passage.

誘導加熱コイル１は、リード部７ａ，７ｂを介して、図示しない高周波電源に接続されている。すなわち、誘導加熱コイル１には、高周波電源からリード部７ａ，７ｂを介して高周波電流を供給することができる。 The induction heating coil 1 is connected to a high frequency power source (not shown) via the lead portions 7a and 7b. That is, the induction heating coil 1 can be supplied with a high frequency current from the high frequency power supply via the lead portions 7a and 7b.

リード部７ａは、リード部本体２２，水平部１５を有している。リード部本体２２は、鉛直方向に延びており、一端側が図示しない高周波電源と接続されており、他端側が水平部１５と接続されている。水平部１５は、後述の誘導加熱コイル１の傾斜面加熱部２と接続されている。 The lead portion 7 a has a lead portion main body 22 and a horizontal portion 15. The lead portion main body 22 extends in the vertical direction, one end side thereof is connected to a high frequency power source (not shown), and the other end side thereof is connected to the horizontal portion 15. The horizontal portion 15 is connected to the inclined surface heating portion 2 of the induction heating coil 1 described later.

また、リード部７ｂは、リード部本体２３，水平部２１，傾斜部１６を有している。リード部本体２３は、鉛直方向に延びており、一端側が図示しない高周波電源と接続されており、他端側が水平部１５を介して傾斜部１６と接続されている。傾斜部１６は、後述の誘導加熱コイル１の平面加熱部３と接続されている。 The lead portion 7b has a lead portion main body 23, a horizontal portion 21, and an inclined portion 16. The lead portion main body 23 extends in the vertical direction, one end side thereof is connected to a high frequency power source (not shown), and the other end side thereof is connected to the inclined portion 16 via the horizontal portion 15. The inclined portion 16 is connected to the flat heating portion 3 of the induction heating coil 1 described later.

図１〜図５に示す様に、誘導加熱コイル１は、傾斜面加熱部２と、平面加熱部３を有している。 As shown in FIGS. 1 to 5, the induction heating coil 1 has an inclined surface heating section 2 and a flat surface heating section 3.

傾斜面加熱部２は、第一上辺部４ａ，第一接続辺部５ａ，第一下辺部６ａ，第二接続辺部５ｂ，第二上辺部４ｂ，第三接続辺部５ｃ，第二下辺部６ｂを有し、これらがこの順に接続されている。 The inclined surface heating unit 2 includes a first upper side 4a, a first connecting side 5a, a first lower side 6a, a second connecting side 5b, a second upper side 4b, a third connecting side 5c and a second lower side. It has a part 6b, which are connected in this order.

第一上辺部４ａ，第一接続辺部５ａ，第二接続辺部５ｂ，第二上辺部４ｂ，第三接続辺部５ｃの横断面の輪郭形状は四角形であり、第一下辺部６ａ，第二下辺部６ｂの横断面の輪郭形状は略五角形である。 The first upper side portion 4a, the first connecting side portion 5a, the second connecting side portion 5b, the second upper side portion 4b, and the third connecting side portion 5c have a quadrangular cross-sectional contour shape, and the first lower side portion 6a, The contour shape of the cross section of the second lower side portion 6b is substantially a pentagon.

図１に示す様に、傾斜面加熱部２は、正面視して略Ｓ字形状を呈している。
Ｓ字の端部である第一上辺部４ａと、第二上辺部４ｂは、わずかな間隔を置いて一直線状に並んで配置されている。すなわち、両者は近接しているが、離間している。
同様に、第一下辺部６ａと、Ｓ字の端部である第二下辺部６ｂも、わずかな間隔を置いて一直線状に並んで配置されている。すなわち、両者は近接しているが、離間している。
また、第一接続辺部５ａ，第二接続辺部５ｂ，第三接続辺部５ｃは、所定の間隔を置いて平行に配置されている。 As shown in FIG. 1, the inclined surface heating unit 2 has a substantially S shape when viewed from the front.
The first upper side 4a and the second upper side 4b, which are the ends of the S-shape, are arranged in a straight line with a slight gap. That is, the two are close to each other, but separated from each other.
Similarly, the first lower side portion 6a and the second lower side portion 6b, which is the S-shaped end portion, are also arranged side by side in a straight line at a slight interval. That is, the two are close to each other, but separated from each other.
Further, the first connection side portion 5a, the second connection side portion 5b, and the third connection side portion 5c are arranged in parallel at a predetermined interval.

第一上辺部４ａ，第一接続辺部５ａ，第一下辺部６ａ，第二接続辺部５ｂによって第一平面部８ａが構成されており、第二接続辺部５ｂ，第二上辺部４ｂ，第三接続辺部５ｃ，第二下辺部６ｂによって第二平面部８ｂが構成されている。第一平面部８ａと第二平面部８ｂは、同一平面内にあり、図１に示す様に、第一平面部８ａと第二平面部８ｂは、一つの領域が第二接続辺部５ｂで二つの領域に仕切られたように構成されている。第一平面部８ａと第二平面部８ｂは、傾斜面を構成している。 A first plane portion 8a is constituted by the first upper side portion 4a, the first connecting side portion 5a, the first lower side portion 6a, and the second connecting side portion 5b, and the second connecting side portion 5b and the second upper side portion 4b. , The third connecting side portion 5c and the second lower side portion 6b constitute a second plane portion 8b. The first plane portion 8a and the second plane portion 8b are in the same plane, and as shown in FIG. 1, one region of the first plane portion 8a and the second plane portion 8b is the second connection side portion 5b. It is configured to be divided into two areas. The first flat surface portion 8a and the second flat surface portion 8b form an inclined surface.

第一平面部８ａを構成する第一接続辺部５ａと、第二平面部８ｂを構成する第三接続辺部５ｃが所定の間隔を置いて配置されており、第一接続辺部５ａと第三接続辺部５ｃの間隔によって、傾斜面加熱部２の有効幅Ｄ１（図３）が設定されている。 The first connection side portion 5a forming the first flat surface portion 8a and the third connection side portion 5c forming the second flat surface portion 8b are arranged at a predetermined interval, and the first connection side portion 5a and the first connection side portion 5a The effective width D1 (FIG. 3) of the inclined surface heating unit 2 is set by the distance between the three connecting side portions 5c.

図１に示す様に、傾斜面加熱部２の第一上辺部４ａ，第一接続辺部５ａ，第一下辺部６ａ，第二接続辺部５ｂ，第二上辺部４ｂ，第三接続辺部５ｃ，第二下辺部６ｂは、それぞれ対向面１３ａ〜１３ｇを有している。対向面１３ａ〜１３ｇは、図６〜図９に示すワーク５０（アリ状突起部材）の斜面５３ａ，５３ｂ（傾斜平面）に近接対向する面である。 As shown in FIG. 1, the first upper side part 4a, the first connecting side part 5a, the first lower side part 6a, the second connecting side part 5b, the second upper side part 4b, and the third connecting side of the inclined surface heating part 2 The portion 5c and the second lower side portion 6b have facing surfaces 13a to 13g, respectively. The facing surfaces 13a to 13g are surfaces that closely face the slopes 53a and 53b (inclined flat surfaces) of the workpiece 50 (the dovetail-shaped protruding member) shown in FIGS. 6 to 9.

また、第一下辺部６ａ，第二下辺部６ｂは、図５に示す様に、対向面１７ａ，１７ｂを有している。対向面１７ａ，１７ｂは、図６〜図９に示すワーク５０（アリ状突起部材）の平坦面５１ａ，５１ｂ（基礎平面）に近接対向する面である。 Further, the first lower side portion 6a and the second lower side portion 6b have facing surfaces 17a and 17b, as shown in FIG. The facing surfaces 17a and 17b are surfaces that closely face the flat surfaces 51a and 51b (basic plane) of the workpiece 50 (the dovetail-shaped protruding member) shown in FIGS. 6 to 9.

図５に示す様に、第一下辺部６ａ，第二下辺部６ｂの、対向面１７ａ，１７ｂと対向面１３ｃ，１３ｇが成す角度は鋭角である。対向面１７ａ，１７ｂと対向面１３ｃ，１３ｇが成す角度は、図６〜図９に示すワーク５０の平坦面５１ａ，５１ｂと斜面５３ａ，５３ｂが成す角度と同じ鋭角である。 As shown in FIG. 5, the angle between the facing surfaces 17a and 17b and the facing surfaces 13c and 13g of the first lower side portion 6a and the second lower side portion 6b is an acute angle. The angle formed by the facing surfaces 17a, 17b and the facing surfaces 13c, 13g is the same acute angle as the angle formed by the flat surfaces 51a, 51b and the slopes 53a, 53b of the workpiece 50 shown in FIGS.

対向面１７ａと対向面１３ｃの境界には、面取り部１８が形成されている。同様に、対向面１７ｂと対向面１３ｇの境界には、面取り部１９が形成されている。 A chamfered portion 18 is formed at the boundary between the facing surface 17a and the facing surface 13c. Similarly, a chamfered portion 19 is formed at the boundary between the facing surface 17b and the facing surface 13g.

第一上辺部４ａ（傾斜面加熱部２の一端）は、リード部７ａの水平部１５と接続されている。水平部１５は、傾斜面加熱部２の第一上辺部４ａの対向面１３ａから遠ざかる方向に延びている。すなわち、リード部本体２２は、第一上辺部４ａの対向面１３ａから離間している。よって、リード部７ａは、ワーク５０の誘導加熱には寄与しない。
第二下辺部６ｂ（傾斜面加熱部２の他端）は、平面加熱部３の第一直線部９ａの一端と接続されている。 The first upper side portion 4a (one end of the inclined surface heating portion 2) is connected to the horizontal portion 15 of the lead portion 7a. The horizontal portion 15 extends in a direction away from the facing surface 13a of the first upper side portion 4a of the inclined surface heating unit 2. That is, the lead portion main body 22 is separated from the facing surface 13a of the first upper side portion 4a. Therefore, the lead portion 7a does not contribute to the induction heating of the work 50.
The second lower side portion 6b (the other end of the inclined surface heating portion 2) is connected to one end of the first straight portion 9a of the flat surface heating portion 3.

平面加熱部３は、第一直線部９ａ，退避部１０ａ，接続部１１，退避部１０ｂ，第二直線部９ｂを有しており、これらがこの順に接続されている。
第一直線部９ａと第二直線部９ｂは、所定の間隔を置いて平行に配置されている。
所定の間隔を置いて配置された第一直線部９ａと第二直線部９ｂによって、平面加熱部３の有効幅Ｄ２が設定されている。
また、第一直線部９ａと第二直線部９ｂは、図６〜図９に示すワーク５０の平坦面５１ａ，５１ｂ（基礎平面）と近接対向する対向面１２ａ，１２ｂ（図４）を有している。 The plane heating unit 3 has a first straight line portion 9a, a retreat portion 10a, a connecting portion 11, a retreat portion 10b, and a second straight line portion 9b, which are connected in this order.
The first straight line portion 9a and the second straight line portion 9b are arranged in parallel at a predetermined interval.
The effective width D2 of the plane heating unit 3 is set by the first straight line portion 9a and the second straight line portion 9b which are arranged at a predetermined interval.
Further, the first straight line portion 9a and the second straight line portion 9b have facing surfaces 12a and 12b (FIG. 4) that closely face and face the flat surfaces 51a and 51b (basic plane) of the workpiece 50 shown in FIGS. 6 to 9. There is.

第一直線部９ａは、傾斜面加熱部２の第二下辺部６ｂと接続されている。
第一直線部９ａの対向面１２ａは、傾斜面加熱部２の第二下辺部６ｂの対向面１７ｂと連続しており、対向面１２ａ，１７ｂは、同一平面内にある。第二直線部９ｂの対向面１２ｂと、傾斜面加熱部２の第一下辺部６ａの対向面１７ａは離間しているが、両者は同一平面内にある。すなわち、対向面１２ａ，１２ｂ，１７ａ，１７ｂは、同一面内にある。 The first straight line portion 9a is connected to the second lower side portion 6b of the inclined surface heating unit 2.
The facing surface 12a of the first straight line portion 9a is continuous with the facing surface 17b of the second lower side portion 6b of the inclined surface heating unit 2, and the facing surfaces 12a and 17b are in the same plane. The facing surface 12b of the second linear portion 9b and the facing surface 17a of the first lower side portion 6a of the inclined surface heating unit 2 are separated from each other, but both are in the same plane. That is, the facing surfaces 12a, 12b, 17a, 17b are in the same plane.

第一直線部９ａと第二直線部９ｂ（対向面１２ａ，１２ｂ）で挟まれた領域は、平面部１４を構成している。平面部１４の面積は、傾斜面加熱部２の第一平面部８ａ，第二平面部８ｂの面積の和よりも大きい。また、平面部１４に対して、第一平面部８ａ，第二平面部８ｂは、鋭角に傾斜する姿勢となっている。 The area sandwiched between the first straight line portion 9a and the second straight line portion 9b (opposing surfaces 12a, 12b) constitutes a flat surface portion 14. The area of the flat surface portion 14 is larger than the sum of the areas of the first flat surface portion 8a and the second flat surface portion 8b of the inclined surface heating portion 2. The first flat surface portion 8a and the second flat surface portion 8b are inclined with respect to the flat surface portion 14 at an acute angle.

平面部１４に対する第一平面部８ａ，第二平面部８ｂの傾斜角は、図６〜図９に示すワーク５０の平坦面５１ａ（５１ｂ）と斜面５３ａ（５３ｂ）の成す角度に対応している。すなわち、平面部１４に対する第一平面部８ａ，第二平面部８ｂの傾斜角は、図６〜図９に示すワーク５０の平坦面５１ａ（５１ｂ）と斜面５３ａ（５３ｂ）の成す角度と一致しているか、又は近い角度である。 The inclination angles of the first flat surface portion 8a and the second flat surface portion 8b with respect to the flat surface portion 14 correspond to the angle formed by the flat surface 51a (51b) and the inclined surface 53a (53b) of the workpiece 50 shown in FIGS. 6 to 9. .. That is, the inclination angles of the first flat surface portion 8a and the second flat surface portion 8b with respect to the flat surface portion 14 match the angle formed by the flat surface 51a (51b) and the slope surface 53a (53b) of the workpiece 50 shown in FIGS. 6 to 9. Or at a close angle.

図４に示す様に、平面加熱部３の第二直線部９ｂは、傾斜面加熱部２の第一下辺部６ａ及び第一接続辺部５ａと近接している。第二直線部９ｂにおける、傾斜面加熱部２と近接する部位には、リード部７ｂの傾斜部１６が接続されている。図４に示す様に、傾斜部１６は、第一接続辺部５ａに沿って傾斜して上方に延びており、水平部２１を介してリード部本体２３と接続されている。 As shown in FIG. 4, the second linear portion 9b of the flat surface heating portion 3 is close to the first lower side portion 6a and the first connecting side portion 5a of the inclined surface heating portion 2. The inclined portion 16 of the lead portion 7b is connected to a portion of the second linear portion 9b that is close to the inclined surface heating portion 2. As shown in FIG. 4, the inclined portion 16 is inclined along the first connection side portion 5 a and extends upward, and is connected to the lead portion main body 23 via the horizontal portion 21.

傾斜部１６は、図１に示す様に、第一接続辺部５ａの対向面１３ｂとは反対側に配置されている。また、リード部本体２３は、水平部２１を介して傾斜部１６と接続されており、傾斜部１６よりもさらに第一接続辺部５ａの対向面１３ｂから離れている。よって、リード部７ｂは、ワーク５０の誘導加熱には寄与しない。 As shown in FIG. 1, the inclined portion 16 is arranged on the opposite side of the facing surface 13b of the first connecting side portion 5a. The lead portion body 23 is connected to the inclined portion 16 via the horizontal portion 21, and is further separated from the facing surface 13b of the first connection side portion 5a than the inclined portion 16. Therefore, the lead portion 7b does not contribute to the induction heating of the work 50.

平面加熱部３の第一直線部９ａと第二直線部９ｂは、退避部１０ａ，接続部１１，退避部１０ｂを介して接続されている。退避部１０ａ，１０ｂは、同じ長さを有していて平行に配置されており、第一直線部９ａ，第二直線部９ｂに対して対向面１２ａ，１２ｂから遠ざかる方向に傾斜して接続されている。 The first straight line portion 9a and the second straight line portion 9b of the flat surface heating unit 3 are connected via the retracting unit 10a, the connecting unit 11, and the retracting unit 10b. The retracting portions 10a and 10b have the same length and are arranged in parallel, and are connected to the first straight line portion 9a and the second straight line portion 9b while being inclined in a direction away from the facing surfaces 12a and 12b. There is.

退避部１０ａの下端側は第一直線部９ａと接続されており、上端側は接続部１１の一端と接続されている。退避部１０ｂの下端側は第二直線部９ｂと接続されており、上端側は接続部１１の他端と接続されている。すなわち、退避部１０ａ，１０ｂは、接続部１１を介して接続されている。 The lower end side of the retracting portion 10a is connected to the first straight portion 9a, and the upper end side thereof is connected to one end of the connecting portion 11. The lower end side of the retracting portion 10b is connected to the second linear portion 9b, and the upper end side thereof is connected to the other end of the connecting portion 11. That is, the evacuation units 10 a and 10 b are connected via the connection unit 11.

平面加熱部３の有効幅Ｄ２は、傾斜面加熱部２の有効幅Ｄ１よりも狭い。すなわち、傾斜面加熱部２の有効幅Ｄ１は、誘導加熱コイル１全体の有効幅でもある。
また、平面加熱部３の第二直線部９ｂと、傾斜面加熱部２の第一接続辺部５ａは、同一面内にあり、両者は近接している。一方、平面加熱部３の第一直線部９ａと、傾斜面加熱部２の第三接続辺部５ｃは、同一面内にはなく、両者は離間している。 The effective width D2 of the flat surface heating unit 3 is narrower than the effective width D1 of the inclined surface heating unit 2. That is, the effective width D1 of the inclined surface heating unit 2 is also the effective width of the induction heating coil 1 as a whole.
Further, the second straight line portion 9b of the flat surface heating unit 3 and the first connecting side portion 5a of the inclined surface heating unit 2 are in the same plane, and both are close to each other. On the other hand, the first straight line portion 9a of the flat surface heating unit 3 and the third connecting side portion 5c of the inclined surface heating unit 2 are not in the same plane and are separated from each other.

図３に示す様に、平面加熱部３の有効幅Ｄ２は、傾斜面加熱部２の有効幅Ｄ１よりも狭く、平面加熱部３の第二直線部９ｂが、傾斜面加熱部２の第一接続辺部５ａと同一面内に配置されているので、平面加熱部３は傾斜面加熱部２の第一接続辺部５ａ側に偏った位置にある。すなわち、平面加熱部３は、傾斜面加熱部２に対して幅方向に偏心している。換言すると、傾斜面加熱部２の有効幅Ｄ１の中心と、平面加熱部３の有効幅Ｄ２の中心は一致していない。 As shown in FIG. 3, the effective width D2 of the flat surface heating unit 3 is narrower than the effective width D1 of the inclined surface heating unit 2, and the second straight line portion 9b of the flat surface heating unit 3 is the first width of the inclined surface heating unit 2. Since it is arranged in the same plane as the connection side portion 5a, the plane heating portion 3 is located at a position biased toward the first connection side portion 5a side of the inclined surface heating portion 2. That is, the flat surface heating unit 3 is eccentric in the width direction with respect to the inclined surface heating unit 2. In other words, the center of the effective width D1 of the inclined surface heating unit 2 and the center of the effective width D2 of the flat surface heating unit 3 do not match.

この様に構成された誘導加熱コイル１は、図６，図８に示す様に、ワーク５０（アリ状突起部材）に近接配置される。ワーク５０は、アリ５２（アリ状突起）を有している。アリ５２の両側には、平坦面５１ａ，５１ｂ（基礎平面）がある。アリ５２は、図示しない工作機械のベッドに設けられたアリ溝と係合する。アリ５２は、平坦面５１ａ，５１ｂと連続する斜面５３ａ，５３ｂ（傾斜平面）を有している。斜面５３ａ（５３ｂ）は、平坦面５１ａ（５１ｂ）に対して鋭角を成して連続している。すなわち、斜面５３ａ，５３ｂは、平坦面５１ａ，５１ｂに対してオーバーハング状に傾斜している。
また、アリ５２は、図６に示す様に、全長Ｌに渡って延びている。 The induction heating coil 1 configured as described above is arranged in proximity to the work 50 (the dovetail-shaped projection member) as shown in FIGS. 6 and 8. The work 50 has a dovetail 52 (a dovetail-like projection). Flat surfaces 51a and 51b (basic planes) are provided on both sides of the ant 52. The dovetail 52 engages with a dovetail groove provided in a bed of a machine tool (not shown). The ant 52 has slopes 53a and 53b (inclined flat surfaces) that are continuous with the flat surfaces 51a and 51b. The slope 53a (53b) is continuous with the flat surface 51a (51b) at an acute angle. That is, the inclined surfaces 53a and 53b are inclined in an overhang shape with respect to the flat surfaces 51a and 51b.
The ant 52 extends over the entire length L as shown in FIG.

図６，図８に示す様に、ワーク５０の一方側（図８において左側）の平坦面５１ａに平面加熱部３が近接対向し、斜面５３ａには傾斜面加熱部２が近接対向し、平坦面５１ａと斜面５３ａが交差する基部５４ａ（交差部）には傾斜面加熱部２の第一下辺部６ａと第二下辺部６ｂが近接対向している。第一下辺部６ａと第二下辺部６ｂは、基部５４に近接し、基部５４に沿ってのびている。 As shown in FIGS. 6 and 8, the flat surface heating unit 3 closely faces the flat surface 51a on one side (left side in FIG. 8) of the work 50, and the inclined surface heating unit 2 closely faces the flat surface 53a. The first lower side portion 6a and the second lower side portion 6b of the inclined surface heating unit 2 are closely opposed to the base portion 54a (intersection portion) where the surface 51a and the inclined surface 53a intersect. The first lower side portion 6a and the second lower side portion 6b are close to the base portion 54 and extend along the base portion 54.

斜面５３ａには、傾斜面加熱部２の各辺部の対向面１３ａ〜１３ｇが近接対向する。
平坦面５１ａには、平面加熱部３の第一直線部９ａ，第二直線部９ｂの対向面１２ａ，１２ｂと、傾斜面加熱部２の第一下辺部６ａ，第二下辺部６ｂの対向面１７ａ，１７ｂが近接対向する。
図３に示す誘導加熱コイル１の有効幅Ｄ１（傾斜面加熱部２の有効幅Ｄ１）は、ワーク５０のアリ５２の全長Ｌよりも短い。 Opposing surfaces 13a to 13g on each side of the inclined surface heating unit 2 closely oppose the inclined surface 53a.
In the flat surface 51a, the facing surfaces 12a and 12b of the first straight line portion 9a and the second straight line portion 9b of the flat surface heating portion 3 and the facing surfaces of the first lower side portion 6a and the second lower side portion 6b of the inclined surface heating portion 2 are provided. 17a and 17b closely face each other.
The effective width D1 of the induction heating coil 1 shown in FIG. 3 (the effective width D1 of the inclined surface heating unit 2) is shorter than the total length L of the dovetail 52 of the workpiece 50.

すなわち、誘導加熱コイル１の幅方向は、第一上辺部４ａ，第二上辺部４ｂ，第一下辺部６ａ，第二下辺部６ｂがのびる方向であり、誘導加熱コイル１の幅方向は、ワーク５０のアリ５２がのびる方向と一致している。そして、傾斜面加熱部２の幅寸法Ｄ１（図３）が、誘導加熱コイル１全体の幅寸法であり、この幅寸法Ｄ１がアリ５２の全長Ｌよりも短い。 That is, the width direction of the induction heating coil 1 is a direction in which the first upper side portion 4a, the second upper side portion 4b, the first lower side portion 6a, and the second lower side portion 6b extend, and the width direction of the induction heating coil 1 is The direction in which the ant 52 of the work 50 extends extends. The width dimension D1 (FIG. 3) of the inclined surface heating unit 2 is the width dimension of the entire induction heating coil 1, and the width dimension D1 is shorter than the total length L of the dovetail 52.

ワーク５０に近接対向した誘導加熱コイル１は、平面加熱部３の第一直線部９ａ側と傾斜面加熱部２の第三接続辺部５ｃが移動方向の前側となり、第二直線部９ｂと第一接続辺部５ａが移動方向の後ろ側となる様にワーク５０に沿って移動する。すなわち、誘導加熱コイル１は、図６の矢印Ａで示す方向に移動する。また、図８では、平面加熱部３の第一直線部９ａと、傾斜面加熱部２の第三接続辺部５ｃが手前側に見えており、誘導加熱コイル１は、紙面の向こう側から手前側に向かって移動する。 In the induction heating coil 1 closely facing the work 50, the first straight line portion 9a side of the flat surface heating unit 3 and the third connection side portion 5c of the inclined surface heating unit 2 are the front side in the moving direction, and the first straight line portion 9b and the first straight line portion 9b. It moves along the workpiece 50 so that the connection side portion 5a is on the rear side in the moving direction. That is, the induction heating coil 1 moves in the direction indicated by the arrow A in FIG. Further, in FIG. 8, the first straight line portion 9a of the flat surface heating unit 3 and the third connection side portion 5c of the inclined surface heating unit 2 are seen on the front side, and the induction heating coil 1 is viewed from the other side of the paper surface to the front side. Move towards.

誘導加熱コイル１は、移動方向前方側において、傾斜面加熱部２の第三接続辺部５ｃと、平面加熱部３の第一直線部９ａが配置されている。第三接続辺部５ｃの方が、第一直線部９ａよりも移動方向前方側に配置されている。
また、誘導加熱コイル１は、移動方向後方側において、傾斜面加熱部２の第一接続辺部５ａと、平面加熱部３の第二直線部９ｂが配置されている。第一接続辺部５ａと第二直線部９ｂは、同一面内に配置されており、移動方向に揃っている。
すなわち、平面加熱部３と傾斜面加熱部２のワーク５０に対する相対移動方向後方の端部が実質的に一致しているので、平面加熱部３は傾斜面加熱部２に対して偏心した位置にあるといえる。
換言すると、有効幅Ｄ２の平面加熱部３の第一直線部９ａ（一方の端部）と、有効幅Ｄ１の傾斜面加熱部２の第三接続辺部５ｃ（一方の端部）の距離は、有効幅Ｄ２の平面加熱部３の第二直線部９ｂ（他方の端部）と、有効幅Ｄ１の傾斜面加熱部２の第一接続辺部５ａ（他方の端部）の距離よりも長い。 In the induction heating coil 1, the third connecting side portion 5c of the inclined surface heating portion 2 and the first straight portion 9a of the flat surface heating portion 3 are arranged on the front side in the moving direction. The third connection side portion 5c is arranged on the front side in the moving direction with respect to the first straight portion 9a.
Further, in the induction heating coil 1, the first connection side portion 5a of the inclined surface heating portion 2 and the second straight portion 9b of the flat surface heating portion 3 are arranged on the rear side in the moving direction. The first connecting side portion 5a and the second linear portion 9b are arranged in the same plane and are aligned in the moving direction.
That is, since the end portions of the flat surface heating unit 3 and the inclined surface heating unit 2 on the rear side in the relative movement direction with respect to the workpiece 50 substantially coincide with each other, the flat surface heating unit 3 is located at a position eccentric with respect to the inclined surface heating unit 2. It can be said that there is.
In other words, the distance between the first straight line portion 9a (one end portion) of the flat heating portion 3 having the effective width D2 and the third connecting side portion 5c (one end portion) of the inclined surface heating portion 2 having the effective width D1 is It is longer than the distance between the second straight line portion 9b (the other end portion) of the flat heating portion 3 having the effective width D2 and the first connection side portion 5a (the other end portion) of the inclined surface heating portion 2 having the effective width D1.

図示していないが、誘導加熱コイル１における移動方向の後ろ側（第二直線部９ｂ及び第一接続辺部５ａ側）には、冷却ジャケット（冷却液噴射装置）が配置されている。冷却ジャケットは、冷却液を噴射しながら誘導加熱コイル１と共にワーク５０に沿って移動する。すなわち、冷却ジャケットは、誘導加熱コイル１によって誘導加熱されて焼入温度まで昇温した部位に向けて冷却液を噴射供給する。誘導加熱コイル１と図示しない冷却ジャケットは、ワーク５０に沿って移動しながら、平坦面５１ａ，斜面５３ａ，基部５４ａを同時に焼入し、平坦面５１ａ，斜面５３ａ，基部５４ａの全領域に渡って焼入する。 Although not shown, a cooling jacket (cooling liquid injection device) is arranged on the rear side (the second straight line portion 9b and the first connection side portion 5a side) in the moving direction of the induction heating coil 1. The cooling jacket moves along with the induction heating coil 1 along the work 50 while jetting the cooling liquid. That is, the cooling jacket jets and supplies the cooling liquid toward a portion that is induction-heated by the induction heating coil 1 and heated to the quenching temperature. The induction heating coil 1 and a cooling jacket (not shown) simultaneously quench the flat surface 51a, the slope 53a, and the base 54a while moving along the work 50, and cover the entire area of the flat surface 51a, the slope 53a, and the base 54a. Quench.

なお、誘導加熱コイル１付近にエアブロー装置（気体噴射装置）を設けるのが好ましい。すなわち、エアブロー装置から気体（空気）を噴射することにより、ワークの加熱昇温中の部位側への冷却液の移動（流動，飛散）を阻止し、ワークの昇温中の部位に冷却液が付着するのを防止するのが好ましい。これにより、ワークの良好な昇温が確保され、また、ワークに加熱ムラができるのを防止することができる。すなわち、ワークの焼入対象部位に、均質で良好な焼入硬化層を形成することができる。 An air blower (gas injection device) is preferably provided near the induction heating coil 1. That is, by injecting gas (air) from the air blower, the movement (flow, scattering) of the cooling liquid to the part side where the workpiece is being heated is raised, and the cooling liquid is made to flow to the part where the workpiece is being heated. It is preferable to prevent the adhesion. As a result, a good temperature rise of the work can be ensured, and uneven heating of the work can be prevented. That is, it is possible to form a uniform and favorable quench-hardened layer on the quenching target portion of the work.

ここで、誘導加熱コイル１は、平面加熱部３の第二直線部９ｂと傾斜面加熱部２の第一接続辺部５ａが、同一面内に配置されていて、ワーク５０における誘導加熱コイル１の移動方向に揃っている。そのため、ワーク５０の平坦面５１ａと斜面５３ａの誘導加熱が同時に終了する。そして、平坦面５１ａと斜面５３ａにおける誘導加熱が終了した部位に、冷却ジャケットから冷却液が噴射供給される。すなわち、平坦面５１ａと斜面５３ａの冷却タイミングを揃えることができ、平坦面５１ａと斜面５３ａにおける誘導加熱が終了した部位を同時に冷却することができる。 Here, in the induction heating coil 1, the second straight line portion 9b of the flat surface heating portion 3 and the first connection side portion 5a of the inclined surface heating portion 2 are arranged in the same plane, and the induction heating coil 1 in the work 50 is arranged. Are aligned in the direction of movement. Therefore, the induction heating of the flat surface 51a and the slope 53a of the work 50 is completed at the same time. Then, the cooling liquid is jetted and supplied from the cooling jacket to the portions of the flat surface 51a and the inclined surface 53a where the induction heating is completed. That is, the cooling timings of the flat surface 51a and the inclined surface 53a can be aligned, and the portions of the flat surface 51a and the inclined surface 53a where the induction heating is completed can be cooled at the same time.

その結果、ワーク５０の平坦面５１ａと斜面５３ａには、図９に示す様な焼入硬化層２０ａ，２０ｂが形成される。焼入硬化層２０ａ，２０ｂの焼入深さは、略一様である。 As a result, quench hardened layers 20a and 20b as shown in FIG. 9 are formed on the flat surface 51a and the inclined surface 53a of the work 50. The quench hardening depths of the quench hardened layers 20a and 20b are substantially uniform.

アリ５２の一方側（図９において左側）の斜面５３ａと平坦面５１ａの焼入が完了すると、アリ５２の他方側（図９において右側）の平坦面５１ｂ，斜面５３ｂ，基部５４ｂに誘導加熱コイル１を近接配置し、他方側の平坦面５１ｂ，斜面５３ｂ，基部５４ｂを焼入する。図９では、平面加熱部３の第二直線部９ｂと、傾斜面加熱部２の第一接続辺部５ａが手前側に見えており、誘導加熱コイル１は、紙面の手前側から向こう側へ移動する。
この様に、ワーク５０の左右の焼入対象部位を、共通の誘導加熱コイル１で誘導加熱することが可能である。 When the quenching of the slope 53a on one side (the left side in FIG. 9) and the flat surface 51a of the ant 52 is completed, induction heating coils are applied to the flat surface 51b, the slope 53b, and the base 54b on the other side (the right side in FIG. 9) of the ant 52. 1 is arranged in close proximity, and the other flat surface 51b, slope 53b, and base 54b are quenched. In FIG. 9, the second straight line portion 9b of the flat surface heating unit 3 and the first connection side portion 5a of the inclined surface heating unit 2 are seen on the front side, and the induction heating coil 1 is moved from the front side to the other side of the paper surface. Moving.
In this manner, the left and right quenching target portions of the work 50 can be induction-heated by the common induction heating coil 1.

また、平坦面５１ａにおける基部５４ａから端部までの長さが、平坦面５１ｂにおける基部５４ｂから端部までの長さと相違する場合（すなわち、ワークが左右対称ではない場合）には、平坦面５１ａを誘導加熱する誘導加熱コイル１で平坦面５１ｂの全領域を誘導加熱できない場合がある。この場合には、平坦面５１ｂの基部５４ｂから端部までの長さに対応した別の誘導加熱コイルを使用する。すなわち、平坦面５１ａ，５１ｂを、別々の誘導加熱コイルで誘導加熱（焼入）する。
また、誘導加熱コイル１の平面加熱部３が、平坦面５１ｂの基部５４ｂから端部に至る長さよりも長く、平坦面５１ｂの全領域に対向することができたとしても、誘導加熱コイルの平面加熱部は、平坦面５１ｂの長さに対応した長さに設定するのが好ましい。 When the length of the flat surface 51a from the base portion 54a to the end portion is different from the length of the flat surface 51b from the base portion 54b to the end portion (that is, when the workpiece is not symmetrical), the flat surface 51a In some cases, the induction heating coil 1 for induction heating cannot heat the entire area of the flat surface 51b by induction heating. In this case, another induction heating coil corresponding to the length from the base 54b to the end of the flat surface 51b is used. That is, the flat surfaces 51a and 51b are induction-heated (quenched) by separate induction heating coils.
In addition, even if the flat heating portion 3 of the induction heating coil 1 is longer than the length of the flat surface 51b from the base portion 54b to the end portion and can face the entire area of the flat surface 51b, the flat surface of the induction heating coil The heating portion is preferably set to have a length corresponding to the length of the flat surface 51b.

本実施形態では、図７に示す様に、ワーク５０の平坦面５１ａの長さＷ１と斜面５３ａの長さＷ２が相違しており、平坦面５１ａの長さＷ１の方が長い。そのため、平坦面５１ａに近接対向する平面加熱部３の第一直線部９ａと第二直線部９ｂの長さは、斜面５３ａに近接対向する傾斜面加熱部２の第一接続辺部５ａ，第二接続辺部５ｂ，第三接続辺部５ｃの長さよりも長い。 In the present embodiment, as shown in FIG. 7, the length W1 of the flat surface 51a of the workpiece 50 and the length W2 of the slope 53a are different, and the length W1 of the flat surface 51a is longer. Therefore, the lengths of the first straight line portion 9a and the second straight line portion 9b of the flat surface heating unit 3 that closely faces the flat surface 51a are as follows. It is longer than the length of the connection side portion 5b and the third connection side portion 5c.

そのため、誘導加熱コイル１の平面加熱部３と傾斜面加熱部２における、移動方向の前方側の第一直線部９ａと第三接続辺部５ｃが一致している（すなわち、図３におけるＤ１とＤ２が同じ寸法である）と、平面加熱部３の第一直線部９ａ、第二直線部９ｂ、接続部１１等によって囲まれた平面部１４は、傾斜面加熱部２の第一平面部８ａと第二平面部８ｂの和よりも相当に大きくなり、平面加熱部３によって生じる交番磁界の磁束密度が、傾斜面加熱部２によって生じる交番磁界の磁束密度よりも大きくなってしまう。その結果、ワーク５０の平坦面５１ａ（５１ｂ）と斜面５３ａ（５３ｂ）の昇温の仕方に大きな差が生じ、平坦面５１ａ（５１ｂ）の温度が上昇し過ぎてしまう。 Therefore, the first straight line portion 9a and the third connecting side portion 5c on the front side in the moving direction of the flat heating portion 3 and the inclined surface heating portion 2 of the induction heating coil 1 are aligned (that is, D1 and D2 in FIG. 3). Have the same dimensions), and the flat surface portion 14 surrounded by the first straight line portion 9a, the second straight line portion 9b, the connecting portion 11 and the like of the flat surface heating portion 3 is the same as the first flat surface portion 8a of the inclined surface heating portion 2. The magnetic flux density of the alternating magnetic field generated by the flat heating portion 3 becomes considerably larger than the sum of the two flat surface portions 8b, and becomes larger than the magnetic flux density of the alternating magnetic field generated by the inclined surface heating portion 2. As a result, there is a large difference in the manner of temperature rise between the flat surface 51a (51b) and the slope 53a (53b) of the workpiece 50, and the temperature of the flat surface 51a (51b) rises too much.

そこで、平坦面５１ａ（５１ｂ）と斜面５３ａ（５３ｂ）の昇温の仕方の差異を小さくするために、誘導加熱コイル１を、本実施形態の様に構成する。すなわち、平面加熱部３と傾斜面加熱部２は、移動方向の後方側（第二直線部９ｂと第一接続辺部５ａ）が一致しており、移動方向の前方側（第一直線部９ａと第三接続辺部５ｃ）が不一致であり、第三接続辺部５ｃが第一直線部９ａよりも移動方向の前方側に配置されている。 Therefore, the induction heating coil 1 is configured as in the present embodiment in order to reduce the difference in the way of heating the flat surface 51a (51b) and the slope 53a (53b). That is, the flat surface heating unit 3 and the inclined surface heating unit 2 are aligned on the rear side in the moving direction (the second straight line portion 9b and the first connecting side portion 5a) and on the front side in the moving direction (the first straight line portion 9a). The third connection side portions 5c) do not match, and the third connection side portions 5c are arranged on the front side in the moving direction with respect to the first straight line portion 9a.

本実施形態では、平面加熱部３が囲う領域（平面部１４）の面積と、傾斜面加熱部２が囲う領域（第一平面部８ａと第二平面部８ｂ）の面積の差が小さくなる様に、平面加熱部３の第一直線部９ａと第二直線部９ｂの間隔を、傾斜面加熱部２の第一接続辺部５ａと第三接続辺部５ｃの間隔よりも狭めている。例えば、傾斜面加熱部２が囲う領域（第一平面部８ａと第二平面部８ｂ）の面積が、平面加熱部３が囲う領域（平面部１４）の面積の４０％（パーセント）以上となる様に、平面加熱部３の第一直線部９ａと第二直線部９ｂの間隔を設定している。 In the present embodiment, the difference between the area of the region surrounded by the plane heating unit 3 (the plane unit 14) and the area surrounded by the inclined surface heating unit 2 (the first plane unit 8a and the second plane unit 8b) becomes small. In addition, the distance between the first straight line portion 9a and the second straight line portion 9b of the flat surface heating portion 3 is narrower than the distance between the first connecting side portion 5a and the third connecting side portion 5c of the inclined surface heating portion 2. For example, the area (first flat surface portion 8a and second flat surface portion 8b) surrounded by the inclined surface heating portion 2 is 40% (percent) or more of the area of the area (flat surface portion 14) surrounded by the flat surface heating portion 3. In this way, the interval between the first straight line portion 9a and the second straight line portion 9b of the flat heating portion 3 is set.

ここで、平面加熱部３は、直線状の中空導体である第一直線部９ａと第二直線部９ｂを有する場合を示したが、第一直線部９ａ側の導体は、直線状に限らず、曲線状（円弧状）であってもよい。すなわち、第一直線部９ａ側の導体が湾曲しており、中央部分が両端部分よりも第二直線部９ｂから離間していたり、中央部分が両端部分よりも第二直線部９ｂに近接していてもよい。すなわち、ワーク５０の平坦面５１ａ，斜面５３ａの誘導加熱量（焼入硬化層の深さ）が同程度になるように、第一直線部９ａ側の導体の形状を適宜変更してもよい。
同様に、傾斜面加熱部２の第三接続辺部５ｃ側の導体も直線状に限らず、曲線状（円弧状）に湾曲していてもよい。 Here, the plane heating unit 3 has shown the case where it has the first straight line portion 9a and the second straight line portion 9b, which are linear hollow conductors, but the conductor on the side of the first straight line portion 9a is not limited to a straight line shape, but a curved line. It may have a shape (arc shape). That is, the conductor on the side of the first straight line portion 9a is curved, and the central portion is farther from the second straight line portion 9b than both end portions, or the central portion is closer to the second straight line portion 9b than both end portions. Good. That is, the shape of the conductor on the side of the first straight portion 9a may be appropriately changed so that the flat surface 51a and the inclined surface 53a of the work 50 have substantially the same amount of induction heating (depth of quench hardening layer).
Similarly, the conductor on the side of the third connection side 5c of the inclined surface heating unit 2 is not limited to a linear shape, and may be curved (curved).

また、図１乃至図５に示す誘導加熱コイル１では、図１１（ａ）に示す様に、ワーク５０の平坦面５１ａに、中央部分が深く両端部分が浅くなる焼入硬化層４１が形成される場合には、誘導加熱コイル１の代わりに、図１０に示す誘導加熱コイル３１を採用するのが好ましい。誘導加熱コイル３１は、誘導加熱コイル１における平面加熱部３の部位のみが誘導加熱コイル１と相違しており、その他は誘導加熱コイル１と同様である。 Further, in the induction heating coil 1 shown in FIGS. 1 to 5, as shown in FIG. 11A, a quench hardened layer 41 having a deep central portion and shallow both end portions is formed on the flat surface 51a of the work 50. In this case, the induction heating coil 31 shown in FIG. 10 is preferably used instead of the induction heating coil 1. The induction heating coil 31 is different from the induction heating coil 1 only in the portion of the induction heating coil 1 which is the flat heating portion 3, and is otherwise the same as the induction heating coil 1.

誘導加熱コイル３１では、平面加熱部３の代わりに平面加熱部３３が採用されている。平面加熱部３３は、第一直線部３９ａと第二直線部３９ｂを有している。
第一直線部３９ａの長手方向の中央部分には、段部３４ａが形成されている。段部３４ａによって、第一直線部３９ａには対向面３５ａ，３５ｂ，３５ｃが形成されている。すなわち、第一直線部３９ａは、中央部分が凹んだ形状を呈しており、第一直線部３９ａの両端の対向面３５ａ，３５ｃは同一面上にあり、中央の対向面３５ｂは対向面３５ａ，３５ｃに対して凹んだ位置にある。 In the induction heating coil 31, the plane heating unit 33 is used instead of the plane heating unit 3. The plane heating unit 33 has a first straight line portion 39a and a second straight line portion 39b.
A step portion 34a is formed in the central portion of the first straight portion 39a in the longitudinal direction. Opposing surfaces 35a, 35b, 35c are formed on the first straight portion 39a by the step portion 34a. That is, the first linear portion 39a has a shape in which the central portion is recessed, the facing surfaces 35a and 35c at both ends of the first linear portion 39a are on the same surface, and the central facing surface 35b is the facing surfaces 35a and 35c. It is in a recessed position.

第二直線部３９ｂも第一直線部３９ａと同様の形状を呈しており、第二直線部３９ｂの中央部分には段部３４ｂが形成されている。段部３４ｂによって第二直線部３９ｂには対向面３６ａ，３６ｂ，３６ｃが形成されている。すなわち、第二直線部３９ｂは、中央部分が凹んだ形状を呈しており、第二直線部３９ｂの両端の対向面３６ａ，３６ｃは同一面上にあり、中央の対向面３６ｂは対向面３６ａ，３６ｃに対して凹んだ位置にある。 The second straight line portion 39b also has the same shape as the first straight line portion 39a, and a step portion 34b is formed in the central portion of the second straight line portion 39b. Opposing surfaces 36a, 36b, 36c are formed on the second linear portion 39b by the step portion 34b. That is, the second linear portion 39b has a shape in which the central portion is recessed, the opposing surfaces 36a and 36c at both ends of the second linear portion 39b are on the same plane, and the central opposing surface 36b is the opposing surface 36a, It is in a recessed position with respect to 36c.

平面加熱部３３がワーク５０の平坦面５１ａに近接対向した際、図１１（ｂ）に示す様に、対向面３５ｂ（３６ｂ）は対向面３５ａ（３６ａ），３５ｃ（３６ｃ）よりも平坦面５１ａから若干離れている。すなわち、ワーク５０の平坦面５１ａが対向する部位には、高周波誘導電流が励起されにくく、平坦面５１ａに形成される焼入硬化層４０は、略一様な深さとなる。換言すると、平坦面５１ａに略一様な焼入硬化層４０が形成される様に、対向面３５ａ（３６ａ），３５ｃ（３６ｃ）と、対向面３５ｂ（３６ｂ）の段差を適宜設定する。具体的には、対向面３５ｂ（３６ｂ）の凹み量や、面積を適宜設定する。 When the flat heating part 33 closely faces the flat surface 51a of the workpiece 50, as shown in FIG. 11B, the facing surface 35b (36b) is flatter than the facing surfaces 35a (36a) and 35c (36c). A little away from. That is, the high frequency induction current is hard to be excited in the portion of the workpiece 50 facing the flat surface 51a, and the quench hardened layer 40 formed on the flat surface 51a has a substantially uniform depth. In other words, the steps between the facing surfaces 35a (36a), 35c (36c) and the facing surface 35b (36b) are appropriately set so that the substantially uniform quench-hardened layer 40 is formed on the flat surface 51a. Specifically, the amount of depression and the area of the facing surface 35b (36b) are appropriately set.

また、第一直線部３９ａと第二直線部３９ｂのいずれか一方のみに段部３４ａ（又は３４ｂ）を設けてもよい。なお、図１１（ａ），図１１（ｂ）では、ワーク５０の斜面（５３ａ）の焼入硬化層の描写は省略している。 Further, the step portion 34a (or 34b) may be provided only on one of the first straight line portion 39a and the second straight line portion 39b. 11(a) and 11(b), the depiction of the quench-hardened layer on the slope (53a) of the work 50 is omitted.

さらに、平坦面５１ａ（５１ｂ）と斜面５３ａ（５３ｂ）を同程度に加熱し、同様に昇温させるために、図示しない高周波電源から供給される高周波電力を増減させてもよい。すなわち、傾斜面加熱部２が、平面加熱部３よりも先にワーク５０と近接対向し始めるが、傾斜面加熱部２が斜面５３ａ（５３ｂ）に対向し、斜面５３ａ（５３ｂ）のみが誘導加熱されている間は、高周波電力を小さくする。そして、平面加熱部３が平坦面５１ａ（５１ｂ）に対向し始め、平坦面５１ａ（５１ｂ）も誘導加熱されるようになると、高周波電力を大きくする。 Further, in order to heat the flat surface 51a (51b) and the inclined surface 53a (53b) to the same degree and to similarly raise the temperature, the high frequency power supplied from a high frequency power source (not shown) may be increased or decreased. That is, the inclined surface heating unit 2 starts to face the workpiece 50 closely before the flat surface heating unit 3, but the inclined surface heating unit 2 faces the slope 53a (53b) and only the slope 53a (53b) is induction-heated. The high frequency power is reduced during the period. Then, when the flat surface heating unit 3 starts to face the flat surface 51a (51b) and the flat surface 51a (51b) is also induction-heated, the high frequency power is increased.

また、平坦面５１ａ（５１ｂ）と斜面５３ａ（５３ｂ）を同程度に加熱し、同様に昇温させるために、斜面５３ａ（５３ｂ）のみが誘導加熱されている間は、誘導加熱コイル１の移動速度を速くし、平面加熱部３が平坦面５１ａ（５１ｂ）に対向し始めると、誘導加熱コイル１の移動速度を遅くしてもよい。 Further, in order to heat the flat surface 51a (51b) and the slope 53a (53b) to the same degree and to raise the temperature similarly, the induction heating coil 1 is moved while only the slope 53a (53b) is induction-heated. The moving speed of the induction heating coil 1 may be decreased when the speed is increased and the planar heating unit 3 starts to face the flat surface 51a (51b).

さらに、平坦面５１と斜面５３を同程度に加熱し、同様に昇温させるために、供給電力の増減と、移動速度の変更を併用してもよい。 Furthermore, in order to heat the flat surface 51 and the slope 53 to the same extent and to raise the temperature in the same manner, increase/decrease in supplied power and change in moving speed may be used together.

その結果、ワーク５０は、斜面５３ａ（５３ｂ）が先に昇温し始め、平坦面５１ａ（５１ｂ）が遅れて昇温するが、ワーク５０における誘導加熱コイル１の移動方向後方側（平面加熱部３の第二直線部９ｂと、傾斜面加熱部２の第一接続辺部５ａ）が対向する部位は、略一様の温度（焼入温度）と成る様に昇温する。 As a result, in the work 50, the slope 53a (53b) starts to heat up first, and the flat surface 51a (51b) heats up with a delay, but the work 50 has a rear side in the moving direction of the induction heating coil 1 (plane heating unit). The temperature at the portion where the second straight line portion 9b of 3 and the first connection side portion 5a of the inclined surface heating portion 2 face each other rises so that the temperature becomes substantially uniform (quenching temperature).

そして、図示しない冷却ジャケットから冷却液が噴射供給され、ワーク５０の昇温した平坦面５１ａ（５１ｂ）と斜面５３ａ（５３ｂ）は時間差なく同じタイミングで冷却され、均一に焼入される。その際、図示しないエアブロー装置によって加圧気体（空気）を噴射し、冷却液がワーク５０における加熱中の部位側へ移動するのを防止するのが好ましい。 Then, a cooling liquid is jetted and supplied from a cooling jacket (not shown), and the heated flat surface 51a (51b) and the inclined surface 53a (53b) of the workpiece 50 are cooled at the same timing without any time difference and uniformly quenched. At that time, it is preferable to inject a pressurized gas (air) by an air blower (not shown) to prevent the cooling liquid from moving to the side of the workpiece 50 during heating.

本実施形態では、平面加熱部３の第一直線部９ａと第二直線部９ｂが、それぞれ退避部１０ａ，１０ｂと接続されている。退避部１０ａ，１０ｂは、第一直線部９ａ，第二直線部９ｂに対して、ワーク５０の平坦面５１ａ（５１ｂ）から離れる方向に傾斜している。これにより、接続部１１が平坦面５１ａ（５１ｂ）から離間し、平坦面５１ａ（５１ｂ）の縁部分５５（図８）が過熱状態になるのを防止することができる。 In the present embodiment, the first straight line portion 9a and the second straight line portion 9b of the plane heating unit 3 are connected to the retracting portions 10a and 10b, respectively. The retracting portions 10a and 10b are inclined with respect to the first linear portion 9a and the second linear portion 9b in a direction away from the flat surface 51a (51b) of the work 50. This can prevent the connecting portion 11 from separating from the flat surface 51a (51b) and the edge portion 55 (FIG. 8) of the flat surface 51a (51b) from becoming overheated.

本実施形態における誘導加熱コイル１では、傾斜面加熱部２は、導体（第一上辺部４ａ，第二上辺部４ｂ、第一下辺部６ａ，第二下辺部６ｂ、第一接続辺部５ａ〜第三接続辺部５ｃ）が直列に接続されたものであって各辺によって囲まれた第一平面部８ａ，第二平面部８ｂを構成するので、密集した交番磁界の磁束が生じ易く、加熱効率が高い。
また、平面加熱部３は、導体（第一直線部９ａ，第二直線部９ｂ，接続部１１等）が直列に接続されたものであって、各部材によって囲まれた平面部１４を構成するので、密集した交番磁界の磁束が生じ易く、加熱効率が高い。 In the induction heating coil 1 according to the present embodiment, the inclined surface heating unit 2 includes conductors (first upper side 4a, second upper side 4b, first lower side 6a, second lower side 6b, first connecting side 5a). ~ The third connection side portion 5c) is connected in series and constitutes the first flat surface portion 8a and the second flat surface portion 8b surrounded by each side, so that a magnetic flux of a dense alternating magnetic field is likely to occur, High heating efficiency.
Further, since the flat-surface heating unit 3 is one in which conductors (the first straight line portion 9a, the second straight-line portion 9b, the connecting portion 11, etc.) are connected in series, and constitutes the flat surface portion 14 surrounded by each member. , The magnetic flux of the dense alternating magnetic field is easily generated, and the heating efficiency is high.

誘導加熱コイル１は、従来技術の様にフェライトコアを設ける必要がなく、誘導加熱コイル１を使用すると、ワーク５０の平坦面５１ａ（５１ｂ），斜面５３ａ（５３ｂ）を良好に同程度に誘導加熱（焼入）することができる。よって、平坦面５１ａ（５１ｂ）の焼入硬化層２０ａと、斜面５３ａ（５３ｂ）の焼入硬化層２０ｂが、図９に示す様に同程度の深さに形成される。 The induction heating coil 1 does not need to be provided with a ferrite core as in the prior art, and when the induction heating coil 1 is used, the flat surface 51a (51b) and the inclined surface 53a (53b) of the work piece 50 are induction-heated to the same extent. Can be (quenched). Therefore, the quench-hardened layer 20a of the flat surface 51a (51b) and the quench-hardened layer 20b of the slope 53a (53b) are formed to the same depth as shown in FIG.

１ 誘導加熱コイル
２ 傾斜面加熱部
３ 平面加熱部
４ａ，４ｂ 第一，第二上辺部（上辺部）
５ａ〜５ｃ 第一〜第三接続辺部（接続辺部）
６ａ，６ｂ 第一，第二下辺部（下辺部）
８ａ，８ｂ 傾斜面加熱部の第一，第二平面部（平面）
９ａ，９ｂ 第一，第二直線部（直線部）
１４ 平面加熱部の平面部（平面）
５０ ワーク（アリ状突起部材）
５１ａ，５１ｂ 平坦面（基礎平面）
５３ａ，５３ｂ 斜面（傾斜平面）
５４ａ，５４ｂ 基部（交差部） DESCRIPTION OF SYMBOLS 1 Induction heating coil 2 Inclined surface heating part 3 Flat surface heating parts 4a, 4b First and second upper side parts (upper side part)
5a-5c 1st-3rd connection side part (connection side part)
6a, 6b First and second lower sides (lower side)
8a, 8b First and second flat surfaces (flat surfaces) of the inclined surface heating unit
9a, 9b 1st, 2nd linear part (straight part)
14 Flat part of the flat heating part (flat)
50 work (ant-shaped projection member)
51a, 51b Flat surface (basic plane)
53a, 53b Slope (slope plane)
54a, 54b Base (intersection)

Claims (4)

基礎平面と、当該基礎平面から鋭角且つオーバーハング状に傾斜する傾斜平面を有するワークのアリ状突起を誘導加熱する誘導加熱コイルにおいて、
基礎平面に近接させる平面加熱部と、傾斜平面に近接させる傾斜面加熱部を有し、
傾斜面加熱部の正面形状は、上辺部，下辺部，接続辺部が直列に接続されたものであって各辺部によって囲まれる平面を構成し、
平面加熱部は、一定の間隔をあけて配置された二以上の直線部を有し、当該直線部が電気的に直列に接続されており、前記二以上の直線部によって囲まれる平面を構成し、
前記平面加熱部の一端が傾斜面加熱部の下辺部の一端に電気的に接続されていて前記平面加熱部と傾斜面加熱部が一連の直列回路を構成し、傾斜面加熱部が構成する平面は、平面加熱部が構成する平面に対して鋭角に傾斜する姿勢となっており、
前記誘導加熱コイルの有効幅は、前記ワークのアリ状突起の全長よりも短く、
ワークの昇温に寄与する平面加熱部の有効幅は、ワークの昇温に寄与する傾斜面加熱部の有効幅よりも狭く、
前記誘導加熱コイルは、ワークの前記二つの平面に沿って相対移動しながら二つの平面の焼入対象範囲の全領域に順に近接対向するものであり、平面加熱部と傾斜面加熱部のワークに対する相対移動方向後方の端部は、実質的に一致していることを特徴とする誘導加熱コイル。 In an induction heating coil for induction heating a dovetail projection of a work having a base plane and an inclined plane inclined at an acute angle and an overhang from the base plane,
It has a flat surface heating unit that is close to the base plane and an inclined surface heating unit that is close to the inclined plane.
The front shape of the inclined surface heating unit is a plane in which the upper side portion, the lower side portion, and the connecting side portion are connected in series, and constitutes a plane surrounded by the respective side portions.
The plane heating unit has two or more straight line portions arranged at regular intervals, the straight line portions are electrically connected in series, and forms a plane surrounded by the two or more straight line portions. ,
One end of the flat surface heating unit is electrically connected to one end of the lower side of the inclined surface heating unit, and the flat surface heating unit and the inclined surface heating unit form a series of series circuits, and the flat surface formed by the inclined surface heating unit. Is an attitude inclined at an acute angle with respect to the plane formed by the plane heating unit ,
The effective width of the induction heating coil is shorter than the entire length of the dovetail projection of the work,
The effective width of the flat surface heating part that contributes to the temperature rise of the work is narrower than the effective width of the inclined surface heating part that contributes to the temperature rise of the work,
The induction heating coil is to be closely opposed to the entire region of the quenching target range of the two planes in order while relatively moving along the two planes of the work, with respect to the work of the plane heating unit and the inclined surface heating unit. An induction heating coil, characterized in that the rear ends in the relative movement direction substantially coincide with each other. 傾斜面加熱部の正面形状は二以上の下辺部と、二以上の上辺部と、三以上の接続辺部によって構成され、前記下辺部の一端と上辺部の一端が前記接続辺部で接続されていて前記二以上の下辺部と、二以上の上辺部と、三以上の接続辺部が直列に接続されたものであって各辺部によって囲まれる平面を構成し、平面加熱部の一端が傾斜面加熱部の一つの下辺部の一端に電気的に接続されてい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 front shape of the inclined surface heating part is composed of two or more lower side parts, two or more upper side parts, and three or more connecting side parts, and one end of the lower side part and one end of the upper side part are connected by the connecting side part. The two or more lower side portions, two or more upper side portions, and three or more connecting side portions are connected in series to form a plane surrounded by each side portion, and one end of the plane heating unit is The induction heating coil according to claim 1, wherein the induction heating coil is electrically connected to one end of a lower side portion of one of the inclined surface heating units. 前記傾斜面加熱部は三つの接続辺部を有しており、前記平面加熱部は二つの直線部を有していることを特徴とする請求項１又は請求項２に記載の誘導加熱コイル。 The induction heating coil according to claim 1 or 2 , wherein the inclined surface heating unit has three connecting side portions , and the flat surface heating unit has two linear portions. 基礎平面と、当該基礎平面から鋭角且つオーバーハング状に傾斜する傾斜平面を有するワークのアリ状突起を誘導加熱する誘導加熱コイルにおいて、In an induction heating coil for induction heating a dovetail projection of a work having a base plane and an inclined plane inclined at an acute angle and an overhang from the base plane,
基礎平面に近接させる平面加熱部と、傾斜平面に近接させる傾斜面加熱部を有し、It has a flat surface heating unit that is close to the base plane and an inclined surface heating unit that is close to the inclined plane.
前記誘導加熱コイルの有効幅は、前記ワークのアリ状突起の全長よりも短く、The effective width of the induction heating coil is shorter than the entire length of the dovetail projection of the work,
ワークの昇温に寄与する平面加熱部の有効幅は、ワークの昇温に寄与する傾斜面加熱部の有効幅よりも狭く、The effective width of the flat surface heating part that contributes to the temperature rise of the work is narrower than the effective width of the inclined surface heating part that contributes to the temperature rise of the work,
前記誘導加熱コイルは、ワークの前記二つの平面に沿って相対移動しながら二つの平面の焼入対象範囲の全領域に順に近接対向するものであり、The induction heating coil is one that closely opposes sequentially to the entire region of the quenching target range of the two planes while relatively moving along the two planes of the work,
平面加熱部と傾斜面加熱部のワークに対する相対移動方向後方の端部は、実質的に一致していることを特徴とする誘導加熱コイル。An induction heating coil, characterized in that the end portions of the flat surface heating portion and the inclined surface heating portion at the rear side in the relative movement direction with respect to the work are substantially aligned.
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