JP7473961B2 - Induction Heating Method - Google Patents

Induction Heating Method Download PDF

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JP7473961B2
JP7473961B2 JP2020144375A JP2020144375A JP7473961B2 JP 7473961 B2 JP7473961 B2 JP 7473961B2 JP 2020144375 A JP2020144375 A JP 2020144375A JP 2020144375 A JP2020144375 A JP 2020144375A JP 7473961 B2 JP7473961 B2 JP 7473961B2
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靖文 中井
貞則 小林
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富士電子工業株式会社
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Description

本発明は、容積に大小の部分を有するワークの誘導加熱方法に関するものである。 The present invention relates to a method for induction heating a workpiece having both large and small volumes.

従来、ワークを高周波誘導加熱する場合、ワークの長手方向に沿う加熱コイルを使用し、ワークを回転させる方法と、軸状ワークの長手方向の一部の周面を囲う環状の加熱コイルを、ワークの長手方向に沿って移動させる、いわゆる「移動焼き」と称される方法のいずれかが採用されている。
前者の誘導加熱コイルは、例えば特許文献1に開示されており、後者の誘導加熱コイルは、例えば特許文献2に開示されている。
Conventionally, when high-frequency induction heating a workpiece, one of two methods has been used: a method in which a heating coil is used along the longitudinal direction of the workpiece and the workpiece is rotated, or a method known as "moving heating", in which an annular heating coil that surrounds part of the longitudinal circumferential surface of a shaft-shaped workpiece is moved along the longitudinal direction of the workpiece.
The former induction heating coil is disclosed in, for example, Patent Document 1, and the latter induction heating coil is disclosed in, for example, Patent Document 2.

実開平3-81354号公報Japanese Utility Model Application Publication No. 3-81354 実開昭55-172365号公報Japanese Utility Model Application Publication No. 55-172365

ところで、ワークの直径が長手方向に一様ではなく、部分的に相違していて、容積に大小の部分を有する場合には、ワークの周面から環状の加熱コイルの内面までの距離が変動してしまうため、「移動焼き」は採用しにくい。そこで、ワークの長手方向に沿うように加熱コイルの形状を工夫し、ワークを全長に渡って同時に誘導加熱する方法が考えられる。 However, if the diameter of the workpiece is not uniform in the longitudinal direction but differs in parts, resulting in some parts with larger and smaller volumes, the distance from the periphery of the workpiece to the inner surface of the annular heating coil will vary, making it difficult to adopt "moving heating." Therefore, a method can be considered in which the shape of the heating coil is devised so that it follows the longitudinal direction of the workpiece, and the entire length of the workpiece is simultaneously induction heated.

しかし、この方法を本発明者が試したところ、ワークの大径の部位と小径の部位 とでは、小径の部位の方が、焼入深さが深くなる傾向がある。そのため、ワークを一様に誘導加熱(高周波焼入)するために、小径の部位と加熱コイルの間隔(クリアランス)を、大径の部位と加熱コイルの間隔(クリアランス)よりも大きくしたり、ケイ素鋼等で構成されたコアを使用するなどすることにより、直径が異なる部位を有するワークの焼入深さの一様化を図った。
ところがこのような手法は、ワークと加熱コイルの適正なクリアランスを発見したり、加熱コイルにおけるコアを配置する適切な位置を発見するなどの熟練が必要であ り、作業者の負担が大きい。
また、ワークの各部の加熱量が適正になるように、複数の加熱コイルを使用することも考えられるが、装置が複雑化してしまう。
However, when the inventor tried this method, he found that the hardening depth of the small diameter part of the workpiece was deeper than that of the large diameter part. Therefore, in order to uniformly inductively heat (high-frequency hardening) the workpiece, the distance (clearance) between the small diameter part and the heating coil was made larger than the distance (clearance) between the large diameter part and the heating coil, and a core made of silicon steel or the like was used, thereby making the hardening depth of the workpiece having parts with different diameters uniform.
However, this method requires skill in finding the appropriate clearance between the workpiece and the heating coil, and in finding the appropriate position for placing the core on the heating coil, and this places a heavy burden on the worker.
It is also possible to use multiple heating coils to ensure that each part of the workpiece is heated to an appropriate amount, but this would result in a complicated device.

そこで本発明は、容積に大小の部分を有するワークを、一つの誘導加熱コイルで、一様に誘導加熱することができる誘導加熱方法を提供することを課題としている。 Therefore, the objective of the present invention is to provide an induction heating method that can uniformly inductively heat a workpiece having both large and small volumes using a single induction heating coil.

上記課題を解決するための請求項1に記載の発明は、容積に大小の部分を有するワークを、誘導加熱コイルを使用して誘導加熱する誘導加熱方法において、前記誘導加熱コイルは、前記ワークの主として容積が大きい大容積部を加熱する直線状である大容積加熱部と、前記ワークの主として容積が小さい小容積部を加熱する小容積加熱部を有し、前記大容積加熱部は、前記大容積部を加熱する際に、当該大容積部に近接する第一加熱機能部と、前記大容積部を加熱する際に、前記小容積部から離れた位置にくる第一アイドル部を有し、前記小容積加熱部は、前記小容積部を加熱する際に、当該小容積部に近接する第二加熱機能部と、前記小容積部を加熱する際に、前記大容積部から離れた位置にくる第二アイドル部を有し、前記ワークと誘導加熱コイルの少なくともいずれか一方が移動可能であり、前記ワーク及び/又は誘導加熱コイルを移動させて、前記ワークの大容積部と小容積部の一方を誘導加熱し、続いて前記ワーク及び/又は誘導加熱コイルを移動させ、前記ワークの大容積部と小容積部の他方を誘導加熱することを特徴とする誘導加熱方法である。 The invention described in claim 1 for solving the above problem is an induction heating method for induction heating a workpiece having large and small volume portions using an induction heating coil, the induction heating coil having a large volume heating section that is linear and that mainly heats the large volume portion of the workpiece, and a small volume heating section that mainly heats the small volume portion of the workpiece, the large volume heating section having a first heating function section that is close to the large volume portion when heating the large volume portion, and a first idle section that is located away from the small volume portion when heating the large volume portion, the small volume heating section having a second heating function section that is close to the small volume portion when heating the small volume portion, and a second idle section that is located away from the large volume portion when heating the small volume portion, at least one of the workpiece and the induction heating coil is movable, the workpiece and/or the induction heating coil are moved to induction heat one of the large volume portion and the small volume portion of the workpiece, and then the workpiece and/or the induction heating coil are moved to induction heat the other of the large volume portion and the small volume portion of the workpiece.

請求項1に記載の発明において、「容積に大小の部分を有するワーク」とは、太さが一様ではないワークを意味している。
本発明によると、誘導加熱コイルは、ワークの主として容積が大きい大容積部を加熱する直線状である大容積加熱部と、ワークの主として容積が小さい小容積部を加熱する小容積加熱部を有し、一つの誘導加熱コイルで、ワークの大容積部と小容積部を誘導加熱することができる。
大容積加熱部は、大容積部を加熱する際に、当該大容積部に近接する第一加熱機能部と、大容積部を加熱する際に、小容積部から離れた位置にくる第一アイドル部を有し、小容積加熱部は、小容積部を加熱する際に、当該小容積部に近接する第二加熱機能部と、小容積部を加熱する際に、大容積部から離れた位置にくる第二アイドル部を有し、ワークと誘導加熱コイルの少なくともいずれか一方が移動可能であり、ワーク及び/又は誘導加熱コイルを移動させて、ワークの大容積部と小容積部の一方を誘導加熱し、続いてワーク及び/又は誘導加熱コイルを移動させ、ワークの大容積部と小容積部の他方を誘導加熱する。
すなわち、誘導加熱コイルは、ワークの大容積部と小容積部に同時には近接せず、大容積部を誘導加熱する際には小容積部から離間し、小容積部を誘導加熱する際には大容積部から離間する。
そのため、ワークの大容積部と小容積部を、個々に適切に誘導加熱することができる。
その結果、大容積部と小容積部を一様に誘導加熱(熱処理)することができる。
また、大容積加熱部は直線状であるので、大容積加熱部の第一加熱機能部と第一アイドル部が直線状に繋がっている。よって、大容積加熱部の構造は簡素である。
そして、第一加熱機能部がワークの大容量部に近接する際には、第一アイドル部がワークの小容積部から離間する。すなわち、小容積部が大容積部よりも小さい分だけ第一アイドル部が小容積部から離間する。
In the invention described in claim 1, "a workpiece having parts of different volumes" means a workpiece having an uneven thickness.
According to the present invention, the induction heating coil has a linear large-volume heating section which heats the large-volume section of the workpiece, which is primarily a large-volume section, and a small-volume heating section which heats the small-volume section of the workpiece, which is primarily a small-volume section, and a single induction heating coil can inductively heat both the large-volume section and the small-volume section of the workpiece.
The large volume heating section has a first heating function section that is close to the large volume section when heating the large volume section, and a first idle section that is located away from the small volume section when heating the large volume section, and the small volume heating section has a second heating function section that is close to the small volume section when heating the small volume section, and a second idle section that is located away from the large volume section when heating the small volume section, and at least one of the workpiece and the induction heating coil is movable, and the workpiece and/or the induction heating coil are moved to inductively heat one of the large volume section and the small volume section of the workpiece, and then the workpiece and/or the induction heating coil are moved to inductively heat the other of the large volume section and the small volume section of the workpiece.
In other words, the induction heating coil is not close to both the large volume portion and the small volume portion of the workpiece at the same time, but is moved away from the small volume portion when induction heating the large volume portion, and is moved away from the large volume portion when induction heating the small volume portion.
Therefore, the large volume portion and the small volume portion of the workpiece can be appropriately induction heated individually.
As a result, the large volume portion and the small volume portion can be induction heated (heat treated) uniformly.
In addition, since the large-volume heating section is linear, the first heating function section and the first idle section of the large-volume heating section are linearly connected, and therefore the structure of the large-volume heating section is simple.
When the first heating function portion approaches the large-volume portion of the workpiece, the first idle portion is separated from the small-volume portion of the workpiece. That is, the first idle portion is separated from the small-volume portion by an amount that the small-volume portion is smaller than the large-volume portion.

請求項に記載の発明は、前記第二アイドル部は、前記第二加熱機能部に対して屈曲又は湾曲していることを特徴とする請求項1に記載の誘導加熱方法である。 The invention described in claim 2 is the induction heating method described in claim 1 , characterized in that the second idle portion is bent or curved with respect to the second heating function portion.

請求項に記載の発明では、第二アイドル部は、第二加熱機能部に対して屈曲又は湾曲しているので、小容積加熱部がワークの小容積部に近接する際に、第二アイドル部が大容積部から離間することができる。そのため、第二アイドル部は、大容積部の誘導加熱に実質的に寄与しない。 In the invention described in claim 2 , since the second idle portion is bent or curved with respect to the second heating function portion, when the small-volume heating portion approaches the small-volume portion of the workpiece, the second idle portion can be separated from the large-volume portion, and therefore the second idle portion does not substantially contribute to induction heating of the large-volume portion.

ワーク及び/又は誘導加熱コイルが、前記ワークの端面を正面視して上下左右斜めのいずれかの方向に移動するのが好ましい(請求項3)。 It is preferable that the workpiece and/or the induction heating coil move in any direction, up, down, left, right, or diagonally, when viewing the end face of the workpiece from the front (Claim 3).

請求項4に記載の発明は、ワークの軸方向に、ワーク及び/又は誘導加熱コイルを移動させながら誘導加熱することを特徴とする請求項1乃至4のいずれかに記載の誘導加熱方法である。 The invention described in claim 4 is an induction heating method described in any one of claims 1 to 4, characterized in that induction heating is performed while moving the workpiece and/or the induction heating coil in the axial direction of the workpiece.

請求項4に記載の発明では、ワークの軸方向に、ワーク及び/又は誘導加熱コイルを移動させながら誘導加熱するので、加熱量を調整することができる。 In the invention described in claim 4, induction heating is performed while moving the workpiece and/or the induction heating coil in the axial direction of the workpiece, so the amount of heat can be adjusted.

本発明の誘導加熱方法によると、ワークの大容積部と小容積部を、個々に一様に誘導加熱することができる。 The induction heating method of the present invention allows the large volume and small volume parts of the workpiece to be individually and uniformly induction heated.

(a)は、本実施形態に係る誘導加熱コイルの斜視図であり、(b)は、(a)とは別方向から見た誘導加熱コイルの斜視図である。FIG. 2A is a perspective view of the induction heating coil according to the present embodiment, and FIG. 2B is a perspective view of the induction heating coil as viewed from a different direction from that of FIG. (a)は、加熱対象の軸状ワークの斜視図であり、(b)は、(a)のA-A断面斜視図である。1A is a perspective view of a shaft-shaped workpiece to be heated, and FIG. 1B is a perspective view of a cross section taken along the line AA of FIG. (a)は、図1の誘導加熱コイルが、図2の軸状ワークの小径部に近接した状態を示す斜視図であり、(b)は、(a)とは別の方向から見た誘導加熱コイル及び軸状ワークの斜視図である。1 is a perspective view showing a state in which the induction heating coil of FIG. 1 is in close proximity to the small diameter portion of the axial workpiece of FIG. 2, and FIG. 3 is a perspective view of the induction heating coil and the axial workpiece as viewed from a different direction than FIG. (a)、(b)は、それぞれ図3の状態の誘導加熱コイル及び軸状ワークの正面図、右側面図である。4A and 4B are a front view and a right side view, respectively, of the induction heating coil and the shaft-shaped workpiece in the state shown in FIG. 3 . (a)は、図1の誘導加熱コイルが、図3の軸状ワークの大容積部に近接した状態を示す斜視図であり、(b)は、(a)とは別の方向から見た誘導加熱コイル及び軸状ワークの斜視図である。1A is an oblique view showing the induction heating coil of FIG. 1 in close proximity to the large volume portion of the axial workpiece of FIG. 3, and FIG. 1B is an oblique view of the induction heating coil and the axial workpiece as viewed from a different direction than FIG. (a)、(b)は、それぞれ図5の状態の誘導加熱コイル及び軸状ワークの正面図、右側面図である。6A and 6B are a front view and a right side view, respectively, of the induction heating coil and the shaft-shaped workpiece in the state shown in FIG. 5 . (a)~(f)は、それぞれ図1の誘導加熱コイルの正面図、平面図、底面図、左側面図、右側面図、背面図である。2A to 2F are a front view, a plan view, a bottom view, a left side view, a right side view, and a rear view of the induction heating coil of FIG. 1, respectively. (a)~(c)は、別の実施形態に係る誘導加熱方法で使用される誘 導加熱コイルが、軸状ワークの小容積部を誘導加熱可能な状態で、軸状ワークに対して軸芯方向に揺動している状態を示す斜視図である。10A to 10C are perspective views showing a state in which an induction heating coil used in an induction heating method according to another embodiment is oscillated in the axial direction relative to a shaft-shaped workpiece in a state in which a small volume portion of the shaft-shaped workpiece can be induction-heated.

以下、図面を参照しながら説明する。
本実施形態に係る誘導加熱方法を実施する誘導加熱コイル1は、銅又は銅合金等の良導体で構成された一本の管部材が、屈曲又は湾曲して形成されている。
The following description will be given with reference to the drawings.
An induction heating coil 1 for carrying out the induction heating method according to this embodiment is formed by bending or curving a single tubular member made of a good conductor such as copper or a copper alloy.

図1に示すように、誘導加熱コイル1は、具体的には、リード部4a、直線部5a(第一加熱機能部、第一アイドル部)、湾曲部6、直線部10(第二加熱機能部)、傾斜部14(第二アイドル部)、中央直線部18(第二アイドル部)、傾斜部15(第二アイドル部)、直線部11(第二加熱機能部)、湾曲部7、直線部5b(第一加熱機能部、第一アイドル部)、湾曲部8、直線部13(第二加熱機能部)、傾斜部17(第二アイドル部)、中央直線部19(第二アイドル部)、傾斜部16(第二アイドル部)、直線部12(第二加熱機能部)、湾曲部9、リード部4bが、この順で接続された構造を有する。 As shown in FIG. 1, the induction heating coil 1 specifically has a structure in which the lead portion 4a, the straight portion 5a (first heating function portion, first idle portion), the curved portion 6, the straight portion 10 (second heating function portion), the inclined portion 14 (second idle portion), the central straight portion 18 (second idle portion), the inclined portion 15 (second idle portion), the straight portion 11 (second heating function portion), the curved portion 7, the straight portion 5b (first heating function portion, first idle portion), the curved portion 8, the straight portion 13 (second heating function portion), the inclined portion 17 (second idle portion), the central straight portion 19 (second idle portion), the inclined portion 16 (second idle portion), the straight portion 12 (second heating function portion), the curved portion 9, and the lead portion 4b are connected in this order.

リード部4a、4bは、誘導加熱コイル1の両端部分に形成されている。リード部4a、4bは、図示しない高周波電源(高周波発振器)に接続されている。リード部4aには、直線部5aの一端が接続されている。 The lead portions 4a and 4b are formed at both ends of the induction heating coil 1. The lead portions 4a and 4b are connected to a high-frequency power source (high-frequency oscillator) not shown. One end of the straight portion 5a is connected to the lead portion 4a.

直線部5aは、誘導加熱コイル1の約全長に渡って真っ直ぐ延びており、後述の大容積加熱部2(第一加熱機能部2a、第一アイドル部2b、2c)を構成する部位である。 The straight section 5a extends straight over approximately the entire length of the induction heating coil 1 and constitutes the large volume heating section 2 (first heating function section 2a, first idle sections 2b and 2c) described below.

直線部5aの他端には、湾曲部6の一端が接続されている。湾曲部6は、直線部5aと交差(直交)する仮想面に沿って円弧状に湾曲している。湾曲部6は、中心角が約90度の円弧形状を呈している。湾曲部6の他端における内周面側の部位には、直線部10の一端が接続されている。 One end of the curved portion 6 is connected to the other end of the straight portion 5a. The curved portion 6 is curved in an arc shape along an imaginary plane that intersects (is perpendicular to) the straight portion 5a. The curved portion 6 has an arc shape with a central angle of approximately 90 degrees. One end of the straight portion 10 is connected to the inner peripheral surface side of the other end of the curved portion 6.

直線部10は、直線部5aと平行であり、直線部5aより長さが短く、後述の小容積加熱部3(第二加熱機能部3b)として機能する。図7(b)に示すように、誘導加熱コイル1を平面視すると、直線部10と直線部5aは重ならず、両者は近接して平行に並んでいる。 The straight portion 10 is parallel to the straight portion 5a, is shorter than the straight portion 5a, and functions as a small volume heating portion 3 (second heating function portion 3b) described below. As shown in FIG. 7(b), when the induction heating coil 1 is viewed in a plan view, the straight portion 10 and the straight portion 5a do not overlap, but are arranged closely parallel to each other.

直線部10の他端には、傾斜部14の一端が接続されている。傾斜部14は、直線状ではあるが、直線部10に対して傾斜している。すなわち、図7(b)に示すように、誘導加熱コイル1を平面視すると、傾斜部14は直線部10に対して傾斜し、傾斜部14の他端は、直線部5aから離れた位置にある。 One end of the inclined portion 14 is connected to the other end of the straight portion 10. The inclined portion 14 is linear, but inclined with respect to the straight portion 10. That is, as shown in FIG. 7(b), when the induction heating coil 1 is viewed in a plan view, the inclined portion 14 is inclined with respect to the straight portion 10, and the other end of the inclined portion 14 is located away from the straight portion 5a.

また、傾斜部14の他端には、中央直線部18の一端が接続されている。中央直線部18は、直線部5a、10と平行に直線状に延びる部位である。すなわち、中央直線部18は、直線部5aから離間した位置で直線部5aと平行に延びている。中央直線部18は、直線部5aよりは短く、直線部10よりは長い。 The other end of the inclined portion 14 is connected to one end of a central straight portion 18. The central straight portion 18 is a portion that extends linearly parallel to the straight portions 5a and 10. In other words, the central straight portion 18 extends parallel to the straight portion 5a at a position separated from the straight portion 5a. The central straight portion 18 is shorter than the straight portion 5a and longer than the straight portion 10.

中央直線部18の他端には、傾斜部15の一端が接続されている。傾斜部15は、傾斜部14と同じ長さの直線状の部位であり、傾斜部14とは傾斜の向きが相違している。すなわち、傾斜部15の他端は、平面視すると、直線部5aに近接した位置に配置されている。傾斜部15と傾斜部14は、中央直線部18の両側に配置されていて、互いに対向している。 One end of the inclined portion 15 is connected to the other end of the central straight portion 18. The inclined portion 15 is a straight portion of the same length as the inclined portion 14, and has a different inclination direction from the inclined portion 14. In other words, the other end of the inclined portion 15 is located in a position close to the straight portion 5a when viewed in a plan view. The inclined portion 15 and the inclined portion 14 are located on either side of the central straight portion 18 and face each other.

傾斜部15の他端には、直線部11の一端が接続されている。直線部11は、平面視して直線部5aと近接し、直線部5aと平行に延びている。直線部11と直線部10は、同じ長さである。直線部11は、小容積加熱部3(第二加熱機能部3a)を構成する部位である。 One end of the straight section 11 is connected to the other end of the inclined section 15. The straight section 11 is adjacent to the straight section 5a in a plan view and extends parallel to the straight section 5a. The straight section 11 and the straight section 10 have the same length. The straight section 11 is a part that constitutes the small volume heating section 3 (second heating function section 3a).

直線部11の他端には、湾曲部7の一端が接続されている。湾曲部7は、湾曲部 6と同じ半径の中心角が約90度の円弧状の部位である。湾曲部7の他端は、リード部4aと交差して延び、直線部5bの一端に接続されている。 One end of the curved portion 7 is connected to the other end of the straight portion 11. The curved portion 7 is an arc-shaped portion with a central angle of approximately 90 degrees and the same radius as the curved portion 6. The other end of the curved portion 7 extends across the lead portion 4a and is connected to one end of the straight portion 5b.

直線部5bは、直線部5aと同等の長さを有し、直線部5aに近接し、直線部5aと平行に延びている。すなわち、直線部5bは、直線部5aに沿って延びる直線状の部位である。直線部5bも、直線部5aと同様に、大容積加熱部2として機能する。 Straight section 5b has the same length as straight section 5a, is close to straight section 5a, and extends parallel to straight section 5a. In other words, straight section 5b is a linear section that extends along straight section 5a. Straight section 5b also functions as large-volume heating section 2, similar to straight section 5a.

直線部5bの他端には、湾曲部8の一端が接続されている。湾曲部8は、湾曲部6、7と同じ半径の中心角が約90度の円弧状の部位である。湾曲部8の他端における内周面側の部位には、直線部13の一端が接続されている。 One end of curved portion 8 is connected to the other end of straight portion 5b. Curved portion 8 is an arc-shaped portion with a central angle of approximately 90 degrees and the same radius as curved portions 6 and 7. One end of straight portion 13 is connected to the inner peripheral surface side portion at the other end of curved portion 8.

直線部13は、直線部10と平行であり、直線部10と同じ長さを有する。直線部13は、直線部10と共に小容積加熱部3(第二加熱機能部3b)として機能する部位である。図7(b)に示すように、誘導加熱コイル1を平面視すると、直線部13、直線部5b、直線部5a、直線部10は平行に並んでいる。 Straight section 13 is parallel to straight section 10 and has the same length as straight section 10. Straight section 13 is a portion that functions together with straight section 10 as small volume heating section 3 (second heating function section 3b). As shown in FIG. 7(b), when the induction heating coil 1 is viewed in a plan view, straight section 13, straight section 5b, straight section 5a, and straight section 10 are aligned in parallel.

直線部13の他端には、傾斜部17の一端が接続されている。図7(b)に示すように、平面視すると、傾斜部17は、他端へいくほど直線部5bから離れるように傾斜している。また、傾斜部17は、間に直線部5a、5bを挟んで、傾斜部14と対称の形状を呈している。 One end of the inclined portion 17 is connected to the other end of the straight portion 13. As shown in FIG. 7(b), in a plan view, the inclined portion 17 is inclined so as to move away from the straight portion 5b as it approaches the other end. In addition, the inclined portion 17 has a shape symmetrical to the inclined portion 14, with the straight portions 5a and 5b sandwiched between them.

傾斜部17の他端には、中央直線部19の一端が接続されている。中央直線部19は、中央直線部18と同じ長さを有し、中央直線部18と平行に延びている。 One end of the central straight section 19 is connected to the other end of the inclined section 17. The central straight section 19 has the same length as the central straight section 18 and extends parallel to the central straight section 18.

中央直線部19の他端には、傾斜部16が接続されている。図7(b)に示すように、誘導加熱コイル1を平面視すると、傾斜部16は、他端側へいくほど直線部5bに接近するように傾斜している。 The other end of the central straight section 19 is connected to the inclined section 16. As shown in FIG. 7(b), when the induction heating coil 1 is viewed in a plan view, the inclined section 16 is inclined so that it approaches the straight section 5b as it approaches the other end.

傾斜部16の他端には、直線部12の一端が接続されている。直線部12は、直線部11と同じ長さを有し、直線部11と平行に配置されている。直線部12は、直線部11と共に、小容積加熱部3(第二加熱機能部3a)として機能する部位である。 One end of the straight section 12 is connected to the other end of the inclined section 16. The straight section 12 has the same length as the straight section 11 and is arranged parallel to the straight section 11. The straight section 12, together with the straight section 11, is a portion that functions as the small volume heating section 3 (second heating function section 3a).

直線部12の他端には、湾曲部9の一端の内周面側の部位が接続されている。湾曲部9は、湾曲部6、7、8と同じ半径の中心角が約90度の円弧状の部位である。湾曲部9の他端は、直線部5bに近接し、リード部4bの一端に接続されている。 The other end of the straight section 12 is connected to a portion of the inner circumferential surface of one end of the curved section 9. The curved section 9 is an arc-shaped portion with a central angle of approximately 90 degrees and the same radius as the curved sections 6, 7, and 8. The other end of the curved section 9 is adjacent to the straight section 5b and is connected to one end of the lead section 4b.

誘導加熱コイル1の約全長に渡って延びる直線部5a、5bは、大容積加熱部2を構成している。すなわち、大容積加熱部2は、全長に渡って直線状である。また、直線部5a、5bには、軸状ワークWと近接し、軸状ワークWの誘導加熱に寄与する第一加熱機能部2aと、軸状ワークWの誘導加熱に寄与しない第一アイドル部2b、2cを有する。 The straight sections 5a and 5b, which extend over approximately the entire length of the induction heating coil 1, constitute the large-volume heating section 2. In other words, the large-volume heating section 2 is linear over its entire length. The straight sections 5a and 5b also have a first heating function section 2a that is adjacent to the axial workpiece W and contributes to the induction heating of the axial workpiece W, and first idle sections 2b and 2c that do not contribute to the induction heating of the axial workpiece W.

誘導加熱コイル1は、一本の管部材で構成されており、誘導加熱コイル1に通電すると、近接した直線部5a、5bには同方向の電流が流れる。すなわち、誘導加熱コイル1に高周波電流を供給すると、直線部5a、5bには高周波電流が同方向に同期して流れる。 The induction heating coil 1 is composed of a single tube member, and when a current is applied to the induction heating coil 1, current flows in the same direction through the adjacent straight sections 5a and 5b. In other words, when a high-frequency current is supplied to the induction heating coil 1, high-frequency current flows synchronously in the same direction through the straight sections 5a and 5b.

ここで、大容積加熱部2は、直線部5a、5bで構成されており、軸状ワークWの大容積部w1の長さに対応する長さ部分が、第一加熱機能部2aを構成する。また、大容積加熱部2における第一加熱機能部2a以外の部位が、第一アイドル部2b、2cを構成する。第一加熱機能部2aは、大容積加熱部2の中央部分に構成され、第一アイドル部2b、2cは、第一加熱機能部2aの両側に構成される。 Here, the large-volume heating section 2 is composed of straight sections 5a, 5b, and the length portion corresponding to the length of the large-volume section w1 of the axial workpiece W constitutes the first heating function section 2a. Furthermore, the portions of the large-volume heating section 2 other than the first heating function section 2a constitute the first idle sections 2b, 2c. The first heating function section 2a is configured in the central portion of the large-volume heating section 2, and the first idle sections 2b, 2c are configured on both sides of the first heating function section 2a.

また、誘導加熱コイル1は、図7(b)に示すように、対向する直線部11、12が小容積加熱部3の第二加熱機能部3aを構成し、対向する直線部10、13が小容積加熱部3の第二加熱機能部3bを構成している。 As shown in FIG. 7(b), the opposing straight sections 11 and 12 of the induction heating coil 1 constitute the second heating function section 3a of the small-volume heating section 3, and the opposing straight sections 10 and 13 constitute the second heating function section 3b of the small-volume heating section 3.

そして、第二加熱機能部3a、3bの間に、小容積加熱部3の第二アイドル部3cが構成されている。第二アイドル部3cは、傾斜部15、16、中央直線部18、19、傾斜部14、17によって構成されている。 The second idle section 3c of the small volume heating section 3 is formed between the second heating function sections 3a and 3b. The second idle section 3c is formed by the inclined sections 15 and 16, the central straight sections 18 and 19, and the inclined sections 14 and 17.

直線部10、13の間隔と、直線部11、12の間隔は、中央直線部18、19の間隔よりも狭い。すなわち、中央直線部18、19は、傾斜部14~17によって、直線部10、13、及び直線部11、12よりも互いに離間している。また、誘導加熱コイル1の各部の長さ、傾斜角度等は、誘導加熱対象の軸状ワークWの各部の大きさに対応している。 The distance between straight sections 10, 13 and between straight sections 11, 12 is narrower than the distance between central straight sections 18, 19. In other words, central straight sections 18, 19 are spaced farther apart from each other than straight sections 10, 13 and straight sections 11, 12 due to inclined sections 14-17. In addition, the length and inclination angle of each section of induction heating coil 1 correspond to the size of each section of axial workpiece W to be induction heated.

すなわち、小容積加熱部3の第二加熱機能部3a(直線部11、12)、第二加熱機能部3b(直線部10、13)、第二アイドル部3c(傾斜部15、16、中央直線部18、19、傾斜部14、17)の各部の寸法は、軸状ワークWの小容積部w2、w3、大容積部w1の大きさにそれぞれ対応している。具体的には、第二加熱機能部3aを構成する直線部11、12の間に、軸状ワークWの小容積部w2を配置することができ、同様に、第二加熱機能部3bを構成する直線部10、13の間に、軸状ワークWの小容積部w3を配置することができる。すなわち、小容積部w2に直線部11、12を近接対向させることができると共に、小容積部w3に直線部10、13を近接対向させることができる。 That is, the dimensions of the second heating function section 3a (straight sections 11, 12), the second heating function section 3b (straight sections 10, 13), and the second idle section 3c (inclined sections 15, 16, central straight sections 18, 19, and inclined sections 14, 17) of the small volume heating section 3 correspond to the sizes of the small volume sections w2, w3, and the large volume section w1 of the axial workpiece W, respectively. Specifically, the small volume section w2 of the axial workpiece W can be arranged between the straight sections 11 and 12 that constitute the second heating function section 3a, and similarly, the small volume section w3 of the axial workpiece W can be arranged between the straight sections 10 and 13 that constitute the second heating function section 3b. That is, the straight sections 11 and 12 can be arranged closely opposite the small volume section w2, and the straight sections 10 and 13 can be arranged closely opposite the small volume section w3.

また、第二加熱機能部3a、3bが、軸状ワークWの小容積部w2、w3に近接対向する際には、第二アイドル部3cは、軸状ワークWの大容積部w1から大きく離間する。すなわち、誘導加熱コイル1に高周波電流が供給された際に、大容積部w1に高周波誘導電流がほとんど励起することがない程度に、第二アイドル部3cを構成する直線部18、19、及び傾斜部14~17は、大容積部w1と離間する。 When the second heating function parts 3a, 3b are closely opposed to the small volume parts w2, w3 of the axial workpiece W, the second idle part 3c is separated significantly from the large volume part w1 of the axial workpiece W. In other words, when a high-frequency current is supplied to the induction heating coil 1, the straight parts 18, 19 and the inclined parts 14 to 17 constituting the second idle part 3c are separated from the large volume part w1 to such an extent that almost no high-frequency induction current is excited in the large volume part w1.

また、大容積加熱部2と小容積加熱部3は、湾曲部6~9を介して接続されている。湾曲部6~9は、それぞれ中心角が約90度の同じ半径の円弧であり、大容積加熱部2が属する平面と、小容積加熱部3が属する平面は、湾曲部6~9の半径の距離だけ離間している。湾曲部6~9の半径は、軸状ワークWの大容積部w1の半径の2倍以上、又は、軸状ワークWの小容積部w2、w3の半径の3倍以上であるのが好ましい。 The large-volume heating section 2 and the small-volume heating section 3 are connected via curved sections 6-9. The curved sections 6-9 are each arcs of the same radius with a central angle of approximately 90 degrees, and the plane to which the large-volume heating section 2 belongs and the plane to which the small-volume heating section 3 belongs are separated by the distance of the radius of the curved sections 6-9. It is preferable that the radius of the curved sections 6-9 is at least twice the radius of the large-volume section w1 of the axial workpiece W, or at least three times the radius of the small-volume sections w2 and w3 of the axial workpiece W.

そのため、小容積加熱部3の第二加熱機能部3a、3bに、軸状ワークWの小容積部w2、w3が近接対向する際には、大容積加熱部2は、軸状ワークWから離間している。すなわち、誘導加熱コイル1に高周波電流が供給された際に、大容積加熱部2は、軸状ワークW(大容積部w1)に高周波誘導電流をほとんど励起させることがない。 Therefore, when the small volume sections w2, w3 of the axial workpiece W are closely opposed to the second heating function sections 3a, 3b of the small volume heating section 3, the large volume heating section 2 is separated from the axial workpiece W. In other words, when high-frequency current is supplied to the induction heating coil 1, the large volume heating section 2 hardly excites a high-frequency induction current in the axial workpiece W (large volume section w1).

以上説明した誘導加熱コイル1は、リード部4a、4bが、図示しない高周波電源(高周波発振器)に接続されており、高周波誘導加熱の実施時には、高周波電源から高周波電力が供給される。また、誘導加熱コイル1は、図示しない移動機構を備えており、軸状ワークWに接近したり、離間することができる。 The induction heating coil 1 described above has lead portions 4a and 4b connected to a high-frequency power source (high-frequency oscillator) not shown, and high-frequency power is supplied from the high-frequency power source when high-frequency induction heating is performed. In addition, the induction heating coil 1 is equipped with a moving mechanism not shown, and can be moved toward or away from the axial workpiece W.

次に、誘導加熱コイル1によって、軸状ワークWを誘導加熱する場合について説明する。軸状ワークWには、誘導加熱対象の部位として、大容積部w1と、大容積部w1の両側に小容積部w2、w3がある。 Next, we will explain the case where an axial workpiece W is induction heated by an induction heating coil 1. The axial workpiece W has a large volume portion w1 and small volume portions w2 and w3 on either side of the large volume portion w1 as the portions to be induction heated.

具体的には、図2(a)、図2(b)に示すように、軸状ワークWは、中央に直径が比較的大きい大容積部w1を有し、両端に直径が比較的小さい小容積部w2、w3を有する軸状のワークである。図2(b)に示すように、大容積部w1は、内部に中空部hが設けられた中空構造を呈しており、小容積部w2、w3は中実構造である。軸状ワークWは、図示しない支持機構によって回転可能に両端支持されており、当該支持機構によって回転駆動される。 Specifically, as shown in Figures 2(a) and 2(b), the axial workpiece W is an axial workpiece having a large volume portion w1 with a relatively large diameter in the center, and small volume portions w2 and w3 with relatively small diameters at both ends. As shown in Figure 2(b), the large volume portion w1 has a hollow structure with a hollow portion h provided therein, and the small volume portions w2 and w3 have a solid structure. The axial workpiece W is rotatably supported at both ends by a support mechanism (not shown), and is rotationally driven by the support mechanism.

図1(a)、図1(b)に示す誘導加熱コイル1は、図示しない移動機構によって移動することができ、図3(a)、図3(b)、図4(a)、図4(b)に示すように、誘導加熱コイル1は、軸状ワークWに接近することができる。 The induction heating coil 1 shown in Figures 1(a) and 1(b) can be moved by a moving mechanism (not shown), and as shown in Figures 3(a), 3(b), 4(a), and 4(b), the induction heating coil 1 can approach the axial workpiece W.

図3(a)、図3(b)に示すように、軸状ワークWの小容積部w2の周面には、誘導加熱コイル1の小容積加熱部3の直線部11、12(第二加熱機能部3a)が近接対向しており、小容積部w3には、小容積加熱部3の直線部10、13(第二加熱機能部3b)が近接対向している。 As shown in Figures 3(a) and 3(b), the linear portions 11 and 12 (second heating function portion 3a) of the small-volume heating portion 3 of the induction heating coil 1 are closely opposed to the peripheral surface of the small-volume portion w2 of the axial workpiece W, and the linear portions 10 and 13 (second heating function portion 3b) of the small-volume heating portion 3 are closely opposed to the peripheral surface of the small-volume portion w3.

このとき、小容積加熱部3の第二アイドル部3cは、図3(b)に示すように、傾斜部14~17によって、軸状ワークWの大容積部w1から大きく離間し、退避している。すなわち、第二アイドル部3c(中央直線部18、19、傾斜部14~17)は、大容積部w1に高周波誘導電流を励起させることはなく、大容積部w1を高周波誘導加熱しない。 At this time, as shown in FIG. 3(b), the second idle portion 3c of the small volume heating section 3 is largely separated and retracted from the large volume portion w1 of the shaft-shaped workpiece W by the inclined portions 14 to 17. In other words, the second idle portion 3c (central straight portions 18, 19, inclined portions 14 to 17) does not excite a high-frequency induction current in the large volume portion w1, and does not high-frequency induction heat the large volume portion w1.

一方、大容積加熱部2(直線部5a、5b)は、図4(a)に示すように、軸状ワークWから離間した位置にある。そのため、大容積加熱部2は、軸状ワークWの高周波誘導加熱には寄与しない。 On the other hand, the large-volume heating section 2 (straight sections 5a, 5b) is located away from the axial workpiece W, as shown in FIG. 4(a). Therefore, the large-volume heating section 2 does not contribute to high-frequency induction heating of the axial workpiece W.

この状態で軸状ワークWを回転駆動するとともに、誘導加熱コイル1に高周波電力を供給すると、小容積部w2、w3が小容積加熱部3の第二加熱機能部3a、3bによって高周波誘導加熱されて昇温する、 In this state, when the shaft-shaped workpiece W is rotated and high-frequency power is supplied to the induction heating coil 1, the small-volume sections w2 and w3 are high-frequency induction heated by the second heating function sections 3a and 3b of the small-volume heating section 3, and the temperature rises.

小容積部w2、w3が所定温度(焼入温度)まで昇温すると、図5(a)、図5(b)、図6(a)、図6(b)に示すように、誘導加熱コイル1を移動させ、軸状ワークWの大容積部w1に、大容積加熱部2の第一加熱機能部2a(直線部5a、5b)を近接させる。すなわち、誘導加熱コイル1を下方に移動させる。 When the small volume parts w2 and w3 are heated to a predetermined temperature (hardening temperature), as shown in Figures 5(a), 5(b), 6(a), and 6(b), the induction heating coil 1 is moved to bring the first heating function part 2a (straight parts 5a and 5b) of the large volume heating part 2 close to the large volume part w1 of the axial workpiece W. In other words, the induction heating coil 1 is moved downward.

この移動によって、小容積加熱部3の第二加熱機能部3a、3bは、小容積部w2、w3から離間する。すなわち、第二加熱機能部3a、3bは、小容積部w2、w3に高周波誘導電流をほとんど励起させることがない程度まで小容積部w2、w3から離間する。小容積加熱部3の第二アイドル部3cは、大容積部w1からさらに大きく離間している。 This movement causes the second heating function parts 3a and 3b of the small volume heating part 3 to move away from the small volume parts w2 and w3. That is, the second heating function parts 3a and 3b move away from the small volume parts w2 and w3 to an extent that they hardly excite high-frequency induced currents in the small volume parts w2 and w3. The second idle part 3c of the small volume heating part 3 is even farther away from the large volume part w1.

また、このとき、小容積部w2、w3は、直線部5a、5bから離間している。すなわち、直線部5a、5bは、小容積部w2、w3に高周波誘導電流をほとんど励起させることがない程度に小容積部w2、w3から離間している。ここで、直線部5a、5bにおける小容積部w2、w3に対向する領域部分が、大容積加熱部2の第一アイドル部2b、2cを構成する。 In addition, at this time, the small volume portions w2 and w3 are separated from the straight line portions 5a and 5b. In other words, the straight line portions 5a and 5b are separated from the small volume portions w2 and w3 to such an extent that they hardly excite high-frequency induced currents in the small volume portions w2 and w3. Here, the areas of the straight line portions 5a and 5b facing the small volume portions w2 and w3 constitute the first idle portions 2b and 2c of the large volume heating portion 2.

誘導加熱コイル1には、引き続き高周波電力が供給されており、今度は、直線部5a、5b(大容積加熱部2)の第一加熱機能部2aによって、大容積部w1が高周波誘導加熱されて昇温する。大容積部w1の温度が、所望する温度(焼入温度)に達すると、誘導加熱コイル1への通電を停止し、図示しない冷却設備(冷却液を噴射する冷却ジャケット、浸漬用の冷却液を貯留した冷却液槽)によって、軸状ワークWを急冷する。 High-frequency power continues to be supplied to the induction heating coil 1, and this time the large volume section w1 is high-frequency induction heated by the first heating function section 2a of the straight sections 5a and 5b (large volume heating section 2), causing the temperature to rise. When the temperature of the large volume section w1 reaches the desired temperature (hardening temperature), the power supply to the induction heating coil 1 is stopped, and the axial workpiece W is rapidly cooled by cooling equipment (not shown) (a cooling jacket that sprays cooling liquid, a cooling liquid tank that stores cooling liquid for immersion).

本実施形態では、軸状ワークWの小容積部w2、w3を先に高周波誘導加熱する場合について説明したが、大容積部w1を先に高周波誘導加熱してもよい。この場合には、大容積部w1を高周波誘導加熱した後、誘導加熱コイル1を上方へ移動させ、小容積加熱部3を軸状ワークWに近接させる。 In this embodiment, the case where the small volume portions w2 and w3 of the axial workpiece W are first high-frequency induction heated has been described, but the large volume portion w1 may be first high-frequency induction heated. In this case, after the large volume portion w1 is high-frequency induction heated, the induction heating coil 1 is moved upward to bring the small volume heating portion 3 close to the axial workpiece W.

このように、誘導加熱コイル1を上下方向に移動させることにより、軸状ワークWの大容積部w1と小容積部w2、w3を個別に高周波誘導加熱することができる。本実施形態では、軸状ワークWの大容積部w1は、中空構造を呈しており、中空部hが設けられている。そのため、中実構造よりも熱容量が小さく、大容積部w1を高周波誘導加熱する際には、大容積部w1の温度のみに注意しながら高周波誘導加熱することができる。その結果、大容積部w1を高周波誘導加熱する際に、小容積部w2、w3が高周波誘導加熱されることがなく、軸状ワークWの温度管理が容易である。 In this way, by moving the induction heating coil 1 in the vertical direction, the large volume portion w1 and the small volume portions w2 and w3 of the axial workpiece W can be high-frequency induction heated separately. In this embodiment, the large volume portion w1 of the axial workpiece W has a hollow structure and is provided with a hollow portion h. Therefore, the heat capacity is smaller than that of a solid structure, and when high-frequency induction heating the large volume portion w1, high-frequency induction heating can be performed while paying attention only to the temperature of the large volume portion w1. As a result, when high-frequency induction heating the large volume portion w1, the small volume portions w2 and w3 are not high-frequency induction heated, making it easy to manage the temperature of the axial workpiece W.

例えば、大容積部w1が、本実施形態のように中空部hを有している場合と、中実である場合とで、大容積部w1の誘導加熱時間を相違させても、小容積部w2、w3の温度にはほとんど影響を与えることがない。本実施形態では、小容積部w2、w3が中実であったが、中空形状であっても、大容積部w1の温度にはほとんど影響を及ぼすことなく、小容積部w2、w3のみを適切に高周波誘導加熱して昇温させることができる。 For example, even if the induction heating time of the large volume portion w1 is different between when the large volume portion w1 has a hollow portion h as in this embodiment and when it is solid, there is almost no effect on the temperature of the small volume portions w2 and w3. In this embodiment, the small volume portions w2 and w3 are solid, but even if they are hollow, it is possible to appropriately heat only the small volume portions w2 and w3 by high-frequency induction heating and raise their temperature without almost any effect on the temperature of the large volume portion w1.

また、誘導加熱コイル1の向きを、軸状ワークWの軸芯周りに回転させ、誘導加熱コイル1を斜め方向に往復移動させてもよい。
さらに、誘導加熱コイル1の小容積加熱部3の第二加熱機能部3a、3bを構成する直線部10、13の間隔、直線部11、12の間隔を広げ、軸状ワークW又は誘導加熱コイル1を軸状ワークWの端面を正面視して左右方向に揺動させて小容積部w2、w3を高周波誘導加熱することもできる。
In addition, the direction of the induction heating coil 1 may be rotated around the axis of the shaft-shaped workpiece W, and the induction heating coil 1 may be moved back and forth in an oblique direction.
Furthermore, the spacing between the straight sections 10, 13 and the spacing between the straight sections 11, 12 that constitute the second heating function sections 3a, 3b of the small-volume heating section 3 of the induction heating coil 1 can be increased, and the axial workpiece W or the induction heating coil 1 can be swung left and right when viewing the end face of the axial workpiece W from the front, to perform high-frequency induction heating of the small-volume sections w2, w3.

すなわち、軸状ワークW及び/又は誘導加熱コイル1が、軸状ワークWの端面を正面視して上下左右斜めのいずれかの方向に移動させながら、軸状ワークWを高周波誘導加熱することもできる。 In other words, the axial workpiece W can be high-frequency induction heated while the axial workpiece W and/or the induction heating coil 1 are moved in any direction, up, down, left, right, or diagonally, when viewed from the front of the end face of the axial workpiece W.

本実施形態の誘導加熱方法では、軸状ワークWにおける直径が比較的大きい大容積部w1と、直径が比較的小さい小容積部w2、w3を個別に誘導加熱するので、大容積部w1と小容積部w2、w3をそれぞれ適切に昇温させることができる。 In the induction heating method of this embodiment, the large volume portion w1, which has a relatively large diameter, and the small volume portions w2 and w3, which have relatively small diameters, of the axial workpiece W are induction heated separately, so that the large volume portion w1 and the small volume portions w2 and w3 can each be appropriately heated.

また、本実形態に係る誘導加熱方法では、一つの誘導加熱コイル1で、軸状ワークWの大容積部w1と小容積部w2、w3を個別に誘導加熱することができるので、誘導加熱装置が複雑化することがなく、装置の簡素化を図ることができる。 In addition, in the induction heating method according to this embodiment, the large volume portion w1 and the small volume portions w2 and w3 of the axial workpiece W can be induction heated separately using a single induction heating coil 1, so the induction heating device does not become complicated and the device can be simplified.

本実施形態では、小容積加熱部3の第二加熱機能部3a、3bが、軸状ワークWの小容積部w2、w3の全長に渡って近接対向することができる長さを有している場合について説明した。 In this embodiment, the second heating function parts 3a and 3b of the small volume heating section 3 have a length that allows them to be closely opposed to each other over the entire length of the small volume parts w2 and w3 of the axial workpiece W.

ここで、軸状ワークWの小容積部w2、w3の軸方向長さが、図8(a)に示すように、誘導加熱コイル21の小容積加熱部3の第二加熱機能部3a、3bの領域内に収まらない長さである場合(すなわち、小容積部w2、w3の長さが、直線部10~13よりも長い場合)には、軸状ワークWと誘導加熱コイル21を、軸状ワークWを回転させながら、軸状ワークWを軸芯方向に揺動させる。図8に示す誘導加熱コイル21は、図1等に示す誘導加熱コイル1と同様の構造を有するものであるが、小容積加熱部3の各部の長さが相違している。 Here, if the axial length of the small volume sections w2, w3 of the axial workpiece W is too long to fit within the area of the second heating function sections 3a, 3b of the small volume heating section 3 of the induction heating coil 21 as shown in FIG. 8(a) (i.e., the length of the small volume sections w2, w3 is longer than the straight sections 10-13), the axial workpiece W and the induction heating coil 21 are oscillated in the axial direction while the axial workpiece W is rotated. The induction heating coil 21 shown in FIG. 8 has a structure similar to the induction heating coil 1 shown in FIG. 1, etc., but the lengths of each section of the small volume heating section 3 are different.

すなわち、図8(b)に示すように、軸状ワークWに対して、誘導加熱コイル21を矢印A方向に移動させ、さらに、図8(c)に示すように、誘導加熱コイル1を矢印Bで示す方向に移動させる動作を繰り返しながら小容積部w2、w3の周面を高周波誘導加熱する。誘導加熱コイル21の位置を固定し、軸状ワークWを軸芯方向に揺動させてもよい。 That is, as shown in FIG. 8(b), the induction heating coil 21 is moved in the direction of arrow A relative to the axial workpiece W, and then, as shown in FIG. 8(c), the induction heating coil 1 is moved in the direction of arrow B, and the peripheral surfaces of the small volume portions w2 and w3 are heated by high-frequency induction heating while repeating this operation. The position of the induction heating coil 21 may be fixed, and the axial workpiece W may be oscillated in the axial direction.

このように、軸状ワークWと誘導加熱コイル21を、軸芯方向に相対移動(揺動)させることにより、小容積部w2、w3の周面に略均一な高周波誘導電流を励起させることができる。 In this way, by moving (oscillating) the axial workpiece W and the induction heating coil 21 relative to each other in the axial direction, a substantially uniform high-frequency induction current can be excited on the peripheral surface of the small volume sections w2 and w3.

また、軸状ワークWと誘導加熱コイル21を軸芯方向に揺動させる際、大容積加熱部2は、軸状ワークWに接触又は衝突しない。すなわち、大容積加熱部2は、軸芯方向と平行な直線状の直線部5a、5bで構成されているため、軸状ワークWと誘導加熱コイル21を軸芯方向に相対的に揺動させても、軸状ワークWは、直線部5a、5b(大容積加熱部2)に沿って往復移動するだけである。そのため、軸状ワークWが、大容積加熱部2と接触することはなく、軸状ワークWを良好に高周波誘導加熱することができる。 In addition, when the axial workpiece W and the induction heating coil 21 are oscillated in the axial direction, the large-volume heating section 2 does not come into contact with or collide with the axial workpiece W. That is, since the large-volume heating section 2 is composed of linear sections 5a, 5b that are parallel to the axial direction, even if the axial workpiece W and the induction heating coil 21 are oscillated relatively in the axial direction, the axial workpiece W simply moves back and forth along the linear sections 5a, 5b (large-volume heating section 2). Therefore, the axial workpiece W does not come into contact with the large-volume heating section 2, and the axial workpiece W can be effectively high-frequency induction heated.

1、21 誘導加熱コイル
2 大容積加熱部
2a 第一加熱機能部
2b、2c 第一アイドル部
3 小容積加熱部
3a、3b 第二加熱機能部
3c 第二アイドル部
5a、5b 直線部
W 軸状ワーク
w1 大容積部
w2、w3 小容積部
1, 21 induction heating coil 2 large volume heating section 2a first heating function section 2b, 2c first idle section 3 small volume heating section 3a, 3b second heating function section 3c second idle section 5a, 5b straight section W shaft-shaped workpiece w1 large volume section w2, w3 small volume section

Claims (4)

容積に大小の部分を有するワークを、誘導加熱コイルを使用して誘導加熱する誘導加熱方法において、
前記誘導加熱コイルは、
前記ワークの主として容積が大きい大容積部を加熱する直線状である大容積加熱部と、
前記ワークの主として容積が小さい小容積部を加熱する小容積加熱部を有し、
前記大容積加熱部は、前記大容積部を加熱する際に、当該大容積部に近接する第一加熱機能部と、前記大容積部を加熱する際に、前記小容積部から離れた位置にくる第一アイドル部を有し、
前記小容積加熱部は、前記小容積部を加熱する際に、当該小容積部に近接する第二加熱機能部と、前記小容積部を加熱する際に、前記大容積部から離れた位置にくる第二アイドル部を有し、
前記ワークと誘導加熱コイルの少なくともいずれか一方が移動可能であり、
前記ワーク及び/又は誘導加熱コイルを移動させて、前記ワークの大容積部と小容積部の一方を誘導加熱し、
続いて前記ワーク及び/又は誘導加熱コイルを移動させ、前記ワークの大容積部と小容積部の他方を誘導加熱することを特徴とする誘導加熱方法。
In an induction heating method for induction heating a workpiece having a large and small volume using an induction heating coil,
The induction heating coil is
A linear large-volume heating section that mainly heats a large-volume section of the workpiece;
A small volume heating section is provided for mainly heating a small volume section of the workpiece,
the large-volume heating section has a first heating function section that is close to the large-volume section when heating the large-volume section, and a first idle section that is located away from the small-volume section when heating the large-volume section,
the small volume heating section has a second heating function section that is adjacent to the small volume section when heating the small volume section, and a second idle section that is located away from the large volume section when heating the small volume section,
At least one of the workpiece and the induction heating coil is movable,
The workpiece and/or the induction heating coil are moved to induction heat one of the large volume portion and the small volume portion of the workpiece;
The induction heating method is characterized in that the workpiece and/or the induction heating coil are then moved, and the other of the large volume portion and the small volume portion of the workpiece is induction heated.
前前記第二アイドル部は、前記第二加熱機能部に対して屈曲又は湾曲していることを特徴とする請求項に記載の誘導加熱方法。 The induction heating method according to claim 1 , wherein the second idle portion is bent or curved relative to the second heating function portion. ワーク及び/又は誘導加熱コイルが、前記ワークの端面を正面視して上下左右斜めのいずれかの方向に移動することを特徴とする請求項1又は2に記載の誘導加熱方法。 3. The induction heating method according to claim 1 , wherein the workpiece and/or the induction heating coil moves in any one of up, down, left, right and diagonal directions when the end face of the workpiece is viewed from the front. ワークの軸方向に、ワーク及び/又は誘導加熱コイルを移動させながら誘導加熱することを特徴とする請求項1乃至のいずれかに記載の誘導加熱方法。 4. The induction heating method according to claim 1, wherein the induction heating is performed while moving the workpiece and/or the induction heating coil in the axial direction of the workpiece.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001081514A (en) 1999-09-17 2001-03-27 Fuji Electronics Industry Co Ltd High frequency induction hardening apparatus for shaft- like work and high frequency induction hardening method
JP2003119519A (en) 2001-10-10 2003-04-23 Fuji Electronics Industry Co Ltd Device and method of high-frequency heating for stepped shaft-shaped workpiece
JP2011021242A (en) 2009-07-16 2011-02-03 Fuji Electronics Industry Co Ltd Method and apparatus for high frequency-induction heating

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001081514A (en) 1999-09-17 2001-03-27 Fuji Electronics Industry Co Ltd High frequency induction hardening apparatus for shaft- like work and high frequency induction hardening method
JP2003119519A (en) 2001-10-10 2003-04-23 Fuji Electronics Industry Co Ltd Device and method of high-frequency heating for stepped shaft-shaped workpiece
JP2011021242A (en) 2009-07-16 2011-02-03 Fuji Electronics Industry Co Ltd Method and apparatus for high frequency-induction heating

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