JP2002356719A - Induction hardening method for cam shaft - Google Patents
Induction hardening method for cam shaftInfo
- Publication number
- JP2002356719A JP2002356719A JP2001163938A JP2001163938A JP2002356719A JP 2002356719 A JP2002356719 A JP 2002356719A JP 2001163938 A JP2001163938 A JP 2001163938A JP 2001163938 A JP2001163938 A JP 2001163938A JP 2002356719 A JP2002356719 A JP 2002356719A
- Authority
- JP
- Japan
- Prior art keywords
- induction heating
- frequency induction
- heating coil
- peripheral surface
- cam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関の構成部
品であるカムシャフトの高周波焼入方法に関するもので
ある。The present invention relates to a method for induction hardening a camshaft which is a component of an internal combustion engine.
【０００２】[0002]
【従来の技術】第７図は、内燃機関の構成部品であるカ
ムシャフト１を示すものであって、このカムシャフト１
は、同一の軸線αを有する互いに同軸状の複数のジャー
ナル部２と、互いに隣り合うジャーナル部２の間に配設
された複数のカム部３とをそれぞれ備えている。上述の
ジャーナル部２は、第８図に示すように前記軸線α（ジ
ャーナル部２の中心軸）に直交する面上における断面形
状は円形であるが、カム部３の断面形状は円形ではな
く、図９（ａ）及び（ｂ）に示すように一方側に偏倚し
て突出する部分Ｍ，Ｎを有する形状であるのが一般的で
ある。なお、Ｍは線対称の突出部分、Ｎは非線対称の突
出部分である。2. Description of the Related Art FIG. 7 shows a camshaft 1 which is a component of an internal combustion engine.
Has a plurality of coaxial journal portions 2 having the same axis α, and a plurality of cam portions 3 disposed between the adjacent journal portions 2. The above-described journal portion 2 has a circular cross-section on a plane orthogonal to the axis α (the central axis of the journal portion 2) as shown in FIG. 8, but the cross-section of the cam portion 3 is not circular. As shown in FIGS. 9 (a) and 9 (b), the shape is generally a shape having portions M and N which are biased to one side and project. Note that M is a line-symmetrical protruding portion, and N is a non-linearly symmetrical protruding portion.
【０００３】ところで、上述のジャーナル部２及びカム
部３については、通常、耐摩耗性の向上等の目的のため
に焼入処理を施すようにしている。従来においては、カ
ム部３の高周波焼入（カム部輪郭焼入）を次のようにし
て行っている。まず、図１０（ａ）及び（ｂ）に示すよ
うに、高周波電源（高周波発振器）４に接続された断面
円形の高周波誘導加熱コイル５の中空部Ｐ内に焼入対象
であるカム部３を挿入して、高周波誘導加熱コイル５の
軸線βと、カムシャフト１の軸線αとを互いに一致させ
た状態でカム部３を図外のワーク保持治具にて保持す
る。次いで、このような状態の下で、カムシャフト１を
図外の回転駆動機構により軸線αを中心に回転させなが
ら、高周波誘導加熱コイル５にてカム部３を所要時間に
わたり所要の加熱温度に高周波誘導加熱する。そして、
誘導加熱が終了された直後に、或いは、誘導加熱終了時
点から所定の時間が経過した後に、中空パイプから成る
高周波誘導加熱コイル５の内周面に形成された多数の焼
入冷却液噴射孔６（図１０（ｂ）参照）から焼入冷却液
をカム部３の外周表面に所要時間にわたり噴射してカム
部３の外周表面を急速冷却することにより焼入（カム部
輪郭焼入）するようにしている。Incidentally, the above-described journal portion 2 and cam portion 3 are usually subjected to a quenching process for the purpose of improving abrasion resistance and the like. Conventionally, induction hardening (cam portion contour quenching) of the cam portion 3 is performed as follows. First, as shown in FIGS. 10A and 10B, a cam portion 3 to be quenched is inserted into a hollow portion P of a high-frequency induction heating coil 5 having a circular cross section connected to a high-frequency power source (high-frequency oscillator) 4. The cam portion 3 is held by a work holding jig (not shown) with the axis β of the high-frequency induction heating coil 5 and the axis α of the camshaft 1 aligned with each other. Then, under such a state, the cam portion 3 is heated to a required heating temperature by a high-frequency induction heating coil 5 over a required time while rotating the camshaft 1 about an axis α by a rotation drive mechanism (not shown). Induction heating. And
Immediately after the end of the induction heating or after a predetermined time has elapsed from the end of the induction heating, a number of quenching coolant injection holes 6 formed on the inner peripheral surface of the high-frequency induction heating coil 5 formed of a hollow pipe. From FIG. 10 (b), quenching coolant is sprayed onto the outer peripheral surface of the cam portion 3 for a required time to rapidly cool the outer peripheral surface of the cam portion 3 so that quenching (cam portion contour quenching) is performed. I have to.
【０００４】また、ジャーナル部２の高周波焼入に関し
ても、上述の如きカム部３の高周波焼入方法と同様の高
周波焼入方法を施行している。In addition, the same induction hardening method as the above-described induction hardening method for the cam portion 3 is applied to the induction hardening of the journal portion 2.
【０００５】しかし、従来のように断面円形の高周波誘
導加熱コイル５の軸線βとカムシャフト１の軸線αとを
互いに一致させた状態でカムシャフト１に回転を与えて
焼入を行うと、カム部３の外周表面（輪郭面）３ａのう
ちのカムヒール側部分３ｂと高周波誘導加熱コイル５の
内周面５ａとの間の距離Ｌ1 と、カム部３の外周表面３
ａのうちのカムトップ側部分３ｃと高周波誘導加熱コイ
ル５の内周面５ａとの間の距離Ｌ2 との関係が、Ｌ1 ＜
Ｌ2 となるため、カム部３の外周表面３ａに形成される
焼入硬化層Ｓの深さは、図１１（ａ）及び（ｂ）に示す
如くカムヒール側部分３ｂに比べてカムトップ側部分３
ｃの方がより深くなる傾向となり、これに起因して焼き
割れが発生し易くなる。However, when the camshaft 1 is rotated and quenched while the axis β of the high-frequency induction heating coil 5 having a circular cross section and the axis α of the camshaft 1 are aligned with each other as in the prior art, The distance L 1 between the cam heel side portion 3 b of the outer peripheral surface (contour surface) 3 a of the portion 3 and the inner peripheral surface 5 a of the high frequency induction heating coil 5, and the outer peripheral surface 3 of the cam portion 3
The relationship between the distance L 2 between the cam top side portion 3 c and the inner peripheral surface 5 a of the high-frequency induction heating coil 5 in L a is L 1 <
L 2, and therefore, the depth of the hardened layer S is formed on the outer peripheral surface 3a of the cam portion 3, the cam top portion compared to Kamuhiru portion 3b as shown in FIGS. 11 (a) and (b) 3
c tends to be deeper, and as a result, burning cracks are more likely to occur.
【０００６】そこで、従来では、カム部３の外周表面３
ａに沿って均一な焼入硬化層を形成させるために、図１
２（ａ）及び（ｂ）に示すようにカム部３の外周表面
（カム形状面）３ｃに対向する内周面５ａを前記外周表
面３ａに相似する形状にして成る高周波誘導加熱コイル
５’を用いるようにしている。かくして、カム部３の外
周表面３ａと高周波誘導加熱コイル５’の内径面５ａ’
との間の間隔を前記外周表面３ａの全周において均一と
なるように設定し、カムシャフト１を回転させることな
く静止状態の下で、所要時間にわたり高周波誘導加熱を
行って、加熱終了直後に、或いは、加熱終了時点から所
定時間を経過した後に、カム部３の外周表面３ａに焼入
冷却液噴射孔６’から焼入冷却液を所定時間にわたり噴
射してカム部３の外周表面３ａを急速冷却することによ
り焼入処理を施すようにしているのが実状である。Therefore, conventionally, the outer peripheral surface 3
In order to form a uniform quench hardened layer along
As shown in FIGS. 2A and 2B, a high-frequency induction heating coil 5 'having an inner peripheral surface 5a facing the outer peripheral surface (cam-shaped surface) 3c of the cam portion 3 having a shape similar to the outer peripheral surface 3a is provided. I use it. Thus, the outer peripheral surface 3a of the cam portion 3 and the inner diameter surface 5a 'of the high-frequency induction heating coil 5'
Is set so as to be uniform over the entire circumference of the outer peripheral surface 3a, high-frequency induction heating is performed for a required time under a stationary state without rotating the camshaft 1, and immediately after the end of the heating. Alternatively, after a lapse of a predetermined time from the end of the heating, the quenching coolant is injected from the quenching coolant injection hole 6 ′ to the outer peripheral surface 3 a of the cam portion 3 for a predetermined time, so that the outer peripheral surface 3 a of the cam portion 3 is cleaned. The reality is that quenching is performed by rapid cooling.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、カム部
の外周表面３ａに相似する形状の内周面５ａ’を有する
高周波誘導加熱コイル５’を製作するのは非常に面倒で
あり、制作費が高価になってしまうという問題点があ
る。However, it is very troublesome to manufacture a high-frequency induction heating coil 5 'having an inner peripheral surface 5a' having a shape similar to the outer peripheral surface 3a of the cam portion, and the production cost is high. There is a problem that it becomes.
【０００８】また、図１０（ａ）に示すような断面円形
の高周波誘導加熱コイル５或いは図１２（ａ）に示すよ
うな高周波誘導加熱コイル５’を用いてカム部３の高周
波誘導加熱を行う場合、高周波誘導加熱コイル５又５’
をジャーナル部２を通過させてカム部３に対応する位置
に移動させるためには、高周波誘導加熱コイル５又は
５’を分割開閉可能な構成（いわゆる割型コイルの構
成）にしなければならない。すなわち、図１３に明示す
るように、カムシャフト１のジャーナル部２の半径Ｒ
は、カムシャフト１の軸線αからカムトップまでの距離
Ｌよりも大きいため、この高周波誘導加熱コイル５’の
中空部内をジャーナル部２が通過し得るように、高周波
誘導加熱コイル５’を図１４に示す如く半コイル部分１
０ａ，１０ｂに２分割してその一方のコイル部分１０ａ
を軸１１を中心として回動可能に構成する必要がある。
しかし、分割開閉可能な高周波誘導加熱コイル５’は、
構造が複雑となり、その製作費が高くなってしまう問題
点がある。Further, high-frequency induction heating of the cam portion 3 is performed using a high-frequency induction heating coil 5 having a circular cross section as shown in FIG. 10A or a high-frequency induction heating coil 5 'as shown in FIG. In case, high frequency induction heating coil 5 or 5 '
In order to move the high-frequency induction heating coil 5 or 5 ′ through the journal portion 2 to a position corresponding to the cam portion 3, the high-frequency induction heating coil 5 or 5 ′ must be configured to be able to be divided and opened (a so-called split coil configuration). That is, as shown in FIG. 13, the radius R of the journal portion 2 of the camshaft 1 is
Is larger than the distance L from the axis α of the camshaft 1 to the cam top, so that the high-frequency induction heating coil 5 ′ is connected to the high-frequency induction heating coil 5 ′ in FIG. Half coil part 1 as shown
0a, 10b and one of the coil portions 10a
Need to be configured to be rotatable about the shaft 11.
However, the high-frequency induction heating coil 5 ′ that can be split and opened is
There is a problem that the structure becomes complicated and the manufacturing cost increases.
【０００９】さらに、分割開閉可能な高周波誘導加熱コ
イル５’を備える高周波焼入装置（図示せず）には、高
周波誘導加熱コイル５’を分割開閉するための機構、並
びに、高周波誘導加熱コイル５’を分割開閉させる際に
電気接点部分１２ａ,１２ｂを接続・分離するための機
構が必要となることから、焼入装置の構造が複雑になる
という欠点がある。また、ジャーナル部２を焼入するた
めには、カム部焼入専用の高周波誘導加熱コイル５’と
は別のジャーナル部焼入専用の高周波誘導加熱コイルが
必要となるため、カムシャフト１の高周波焼入に必要な
高周波誘導加熱コイルの数が増えてしまうという不具合
がある。Further, a high frequency quenching device (not shown) provided with a high frequency induction heating coil 5 'which can be divided and opened and closed includes a mechanism for dividing and opening the high frequency induction heating coil 5', and a high frequency induction heating coil 5 '. Since a mechanism for connecting and disconnecting the electrical contact portions 12a and 12b is required when the 'is divided and opened and closed, there is a disadvantage that the structure of the quenching device is complicated. In addition, in order to quench the journal 2, a high-frequency induction heating coil dedicated to quenching the journal is required separately from the high-frequency induction heating coil 5 ′ dedicated to quenching the cam. There is a problem that the number of high-frequency induction heating coils required for quenching increases.
【００１０】本発明は、このような実状に鑑みてなされ
たものであって、その目的は、同一の断面円形の高周波
誘導加熱コイルを用いてカムシャフトのカム部の外周表
面の焼入（カム部輪郭焼入）、並びに、ジャーナル部の
外周表面の均一焼入を行うことができるような高周波焼
入方法を提供することにある。The present invention has been made in view of such circumstances, and has as its object to harden the outer peripheral surface of a cam portion of a camshaft by using a high-frequency induction heating coil having the same circular cross section. Part quenching) and an induction hardening method capable of uniformly quenching the outer peripheral surface of the journal portion.
【００１１】[0011]
【課題を解決する手段】上述の目的を達成するために、
本発明では、カムシャフトのカム部の外周表面を高周波
誘導加熱コイルにて高周波誘導加熱して冷却することに
より、前記カム部の外周表面に沿った領域に焼入硬化層
を形成するようにしたカムシャフトの高周波焼入方法に
おいて、断面円形の高周波誘導加熱コイルを用い、前記
断面円形の高周波誘導加熱コイルの軸線を前記カムシャ
フトの軸線に対してオフセットした位置に配置して前記
カム部の外周表面の各部と前記断面円形の高周波誘導加
熱コイルの内周面との間の間隔を所要の距離に保持し、
この状態の下で、前記カムシャフトを回転させることな
く静止状態のまま前記カム部の外周表面を高周波誘導加
熱して冷却を行うようにしている。また、本発明は、前
記カムシャフトのジャーナル部の外周表面を、前記カム
部の外周表面を高周波誘導加熱する前記断面円形の高周
波誘導加熱コイルと同一のもので高周波誘導加熱して冷
却を行うことにより、高周波焼入するようにしている。
また、本発明では、前記ジャーナル部における焼入幅が
前記カム部の幅よりも広い場合には、前記断面円形の高
周波誘導加熱コイルを前記カムシャフトの軸線に沿って
平行に前記ジャーナル部の焼入対象領域の一端位置と他
端位置との間を所要回数にわたり移動させることによ
り、前記ジャーナル部の焼入対象領域の全体を高周波誘
導加熱して冷却を行うようにしている。In order to achieve the above object,
In the present invention, the quenched and hardened layer is formed in a region along the outer peripheral surface of the cam portion by cooling the outer peripheral surface of the cam portion of the cam shaft by high frequency induction heating with a high frequency induction heating coil. In the induction hardening method for a camshaft, a high-frequency induction heating coil having a circular cross section is used, and the axis of the high-frequency induction heating coil having a circular cross section is arranged at a position offset with respect to the axis of the camshaft, and the outer periphery of the cam portion is Maintain the distance between each part of the surface and the inner peripheral surface of the high-frequency induction heating coil having a circular cross section at a required distance,
Under this condition, the outer peripheral surface of the cam portion is cooled by high-frequency induction heating without rotating the camshaft and in a stationary state. Further, according to the present invention, the outer peripheral surface of the journal portion of the camshaft is cooled by high-frequency induction heating with the same high-frequency induction heating coil having a circular cross section for high-frequency induction heating of the outer peripheral surface of the cam portion. With this, induction hardening is performed.
Further, in the present invention, when the quenching width of the journal portion is wider than the width of the cam portion, the high-frequency induction heating coil having a circular cross section is hardened in parallel with the axis of the camshaft. By moving between the one end position and the other end position of the insertion target region a required number of times, the entire quenching target region of the journal portion is subjected to high-frequency induction heating to perform cooling.
【００１２】本発明の好ましい実施形態では、カムシャ
フトのカム部輪郭焼入及びジャーナル部の焼入を連続す
る工程において順次に施工する高周波焼入方法におい
て、カムシャフトのジャーナル部の外周表面より所要の
距離をもって巻回され、かつ、カム部の幅に所要の幅の
断面円形の高周波誘導加熱コイルを用いてカム部を輪郭
焼入する場合、カムシャフトの軸線と断面円形の高周波
誘導加熱コイルの軸線（中心軸）を互いに一致させた状
態で高周波誘導加熱コイルをカム部に対応配置し、続い
て、断面円形の高周波誘導加熱コイルの軸線をカムシャ
フトの軸線より所要距離だけオフセットさせることによ
り、カムシャフトの外周表面の各部と断面円形の高周波
誘導加熱コイルの内周面との間の間隔（隙間）を所定距
離に保持しておいて、その状態の下で、カムシャフトを
回転することなく高周波誘導加熱を行う。In a preferred embodiment of the present invention, in an induction hardening method in which the contour hardening of the cam portion of the camshaft and the hardening of the journal portion are sequentially performed in a continuous process, a required amount of the outer peripheral surface of the journal portion of the camshaft is required. When the contour of the cam is hardened by using a high-frequency induction heating coil having a circular section and a required width to the width of the cam, the high-frequency induction heating coil having a circular section with the axis of the camshaft. By arranging the high-frequency induction heating coil corresponding to the cam portion with the axes (center axes) aligned with each other, and subsequently offsetting the axis of the high-frequency induction heating coil having a circular cross section by a required distance from the axis of the camshaft, The distance (gap) between each part of the outer peripheral surface of the camshaft and the inner peripheral surface of the high-frequency induction heating coil having a circular cross section is maintained at a predetermined distance. Under the state, the high-frequency induction heating without rotating the camshaft.
【００１３】高周波誘導加熱の終了後に、カム部の外周
表面に焼入冷却液を噴射して冷却することによりカム部
を輪郭焼入を完了する。この際の冷却は、カムシャフト
の軸線に対して断面円形の高周波誘導加熱コイルがオフ
セットされた状態での位置関係を保ったまま、カムシャ
フトを回転させることなく、高周波誘導加熱コイルに設
けられた焼入冷却液噴射孔より焼入冷却液をカム部の外
周表面に噴射してもよいし、或いは、カムシャフトの軸
線と高周波誘導加熱コイルの軸線とを互いに一致させた
状態の下で、カムシャフトを回転させながら、冷却する
ようにしてもよい。After the end of the high-frequency induction heating, the quenching coolant is injected onto the outer peripheral surface of the cam portion to cool it, thereby completing the contour quenching of the cam portion. The cooling at this time was provided on the high-frequency induction heating coil without rotating the camshaft while maintaining the positional relationship in a state where the high-frequency induction heating coil having a circular cross section was offset with respect to the axis of the camshaft. The quenching coolant may be injected from the quenching coolant injection holes to the outer peripheral surface of the cam portion, or the cam may be aligned with the axis of the cam shaft and the axis of the high-frequency induction heating coil. The cooling may be performed while rotating the shaft.
【００１４】ジャーナル部を焼入する場合は、カムシャ
フトの軸線と断面円形の高周波誘導加熱コイルの軸線と
を互いに一致させ、カムシャフトに回転を与えて加熱
し、加熱終了後上記カム部の焼入時と同様な冷却手段を
もってジャーナル部表面に焼入することができる。ま
た、加熱時の高周波電流の周波数を３０ＫＨｚ以下の範
囲として上記カム部並びにジャーナル部を誘導加熱する
ようにしている。When quenching the journal, the axis of the camshaft and the axis of the high-frequency induction heating coil having a circular cross section are made coincident with each other, and the camshaft is heated by rotation. It is possible to quench the surface of the journal with the same cooling means as at the time of insertion. Further, the frequency of the high-frequency current at the time of heating is set to a range of 30 KHz or less so that the cam portion and the journal portion are induction-heated.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施形態について
図１〜図６を参照して説明する。なお、第１図〜図６に
おいて、図７〜図１４と同様の部分には同一の符号を付
して重複する説明を省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIGS. 1 to 6, the same parts as those in FIGS. 7 to 14 are denoted by the same reference numerals, and redundant description will be omitted.
【００１６】まず、図１及び図２を参照して本発明の一
実施形態に係るカムシャフトの高周波焼入方法について
述べる。なお、本実施形態では、カムシャフト１のカム
部３の外周表面（カム面）３ａを焼入対象としており、
この外周表面３ａの輪郭は非線対称の形状を有するカム
部３を輪郭焼入するようにしている。First, a method of induction hardening a camshaft according to an embodiment of the present invention will be described with reference to FIGS. In this embodiment, the outer peripheral surface (cam surface) 3a of the cam portion 3 of the camshaft 1 is quenched.
The contour of the outer peripheral surface 3a is designed to harden the cam portion 3 having a non-symmetrical shape.
【００１７】本実施形態においては、カムシャフト１の
カム部３を焼入処理すべくカム部３の外周表面３ａを高
周波誘導加熱する手段として、ジャーナル部２の径Ｒ1
（カム部３の最大直径Ｒ2 よりも大きい）よりも僅かに
大きな直径Ｒ3 の内周面５ａを有する断面円形の高周波
誘導加熱コイル５を用いるようにしている（図１
（ａ），（ｂ）参照）。In this embodiment, the diameter R 1 of the journal 2 is used as a means for high-frequency induction heating of the outer peripheral surface 3a of the cam 3 in order to harden the cam 3 of the camshaft 1.
And to use a high-frequency induction heating coil 5 of circular cross section having an inner circumferential surface 5a of the (maximum diameter R greater than 2 of the cam portion 3) slightly larger diameter R 3 than (Fig. 1
(See (a) and (b)).
【００１８】カム部３の外周表面３ａを高周波焼入（輪
郭焼入）するに当たっては、まず、断面円形の高周波誘
導加熱コイル５の中空部Ｐ内に被焼入体であるカムシャ
フト１を挿入配置して、高周波誘導加熱コイル５の軸線
βとカムシャフト１の軸線αとを互いに一致させた状態
でカムシャフト１の両端を図外の支持機構にて支持す
る。そして、図外のコイル移動機構により高周波誘導加
熱コイル５を軸線α方向に沿って移動させることによ
り、高周波誘導加熱コイル５を焼入対象のカム部３に対
応する位置に対応配置する。なお、この場合、高周波誘
導加熱コイル５の幅Ｗ0 はカム部３の幅Ｗ1 よりも僅か
に広く設定されているため、カム部３は高周波誘導加熱
コイル５により完全に取り囲まれた状態となる（図１
（ｂ）参照）。In induction hardening (contour quenching) of the outer peripheral surface 3a of the cam portion 3, first, the camshaft 1, which is a member to be hardened, is inserted into the hollow portion P of the high-frequency induction heating coil 5 having a circular cross section. The two ends of the camshaft 1 are supported by a support mechanism (not shown) with the axis β of the high-frequency induction heating coil 5 and the axis α of the camshaft 1 aligned with each other. Then, by moving the high-frequency induction heating coil 5 along the axis α direction by a coil moving mechanism (not shown), the high-frequency induction heating coil 5 is arranged corresponding to the position corresponding to the cam portion 3 to be hardened. In this case, since the width W 0 of the high-frequency induction heating coil 5 is set to be slightly wider than the width W 1 of the cam portion 3, the cam portion 3 is completely surrounded by the high-frequency induction heating coil 5. (Figure 1
(B)).
【００１９】このようなセッティングを行った後に、図
外のコイル移動機構により周波誘導加熱コイル５を軸線
α方向に対して直交する水平方向に距離Ｘだけ移動させ
ると共に、軸線方向に対して直交する垂直方向に距離Ｙ
だけ移動させる（図２（ａ）参照）。これにより、断面
円形の高周波誘導加熱コイル５の軸線αをカムシャフト
１の軸線βに対して所定距離だけオフセットした位置
（偏倚位置若しくは偏心位置）に配置し、カム部３の外
周表面３ａの各部と高周波誘導加熱コイル５の内周面５
ａとの間の間隔を所要の距離に保持する。After such setting, the frequency induction heating coil 5 is moved by a distance X in a horizontal direction perpendicular to the axis α direction by a coil moving mechanism (not shown), and is perpendicular to the axis direction. Distance Y in vertical direction
(See FIG. 2A). Thereby, the axis α of the high-frequency induction heating coil 5 having a circular cross section is arranged at a position (biased position or eccentric position) offset by a predetermined distance from the axis β of the camshaft 1, and each part of the outer peripheral surface 3 a of the cam portion 3 is arranged. And inner peripheral surface 5 of high-frequency induction heating coil 5
a is maintained at a required distance.
【００２０】次いで、上述のような相対的位置関係を保
った状態の下で、高周波誘導加熱コイル５に高周波電源
４から高周波電流を供給し、カムシャフト１を回転させ
ることなく静止状態のままカム部３の外周表面３ａを所
要時間にわたり高周波誘導加熱する。そして、その直後
に高周波誘導加熱コイル５を非通電状態にすると共に、
高周波誘導加熱が終了した直後に、或いは、加熱終了後
の所要時間経過後に、図外の冷却液供給手段により焼入
冷却液を高周波誘導加熱コイル５に設けられた多数の焼
入冷却液噴射孔６からカム部３の外周表面３ａに向けて
噴射して冷却（急冷）する。なお、冷却時においては、
高周波誘導加熱コイル５とカムシャフト１との相対的な
位置関係を図１に示す位置関係に戻してカムシャフト１
を回転させながら冷却するようにしてもよい。Next, a high-frequency current is supplied from the high-frequency power supply 4 to the high-frequency induction heating coil 5 while maintaining the relative positional relationship as described above, and the camshaft 1 remains stationary without rotating the camshaft 1. The outer peripheral surface 3a of the part 3 is subjected to high-frequency induction heating for a required time. Then, immediately after that, the high-frequency induction heating coil 5 is turned off, and
Immediately after the end of the high-frequency induction heating or after a lapse of a required time after the end of the heating, the quenching coolant is supplied to a plurality of quenching coolant injection holes provided in the high-frequency induction heating coil 5 by a coolant supply means (not shown). 6 to the outer peripheral surface 3a of the cam portion 3 for cooling (rapid cooling). During cooling,
The relative positional relationship between the high-frequency induction heating coil 5 and the camshaft 1 is returned to the positional relationship shown in FIG.
May be cooled while rotating.
【００２１】以上のような一連の操作にて、カム部３ａ
の外周表面３ａに焼入硬化層が形成され、カム部３の輪
郭焼入が完了する。By the series of operations described above, the cam portion 3a
A quenching hardened layer is formed on the outer peripheral surface 3a, and the contour quenching of the cam portion 3 is completed.
【００２２】上述のような高周波焼入方法を施行するこ
とによってカム部３ａの外周表面３ａに得られる焼入硬
化層パターンは、図３及び図４に示す如く、カムトップ
側部分３ｃにおける焼入硬化層の深さとカムヒール側部
分３ｂにおける焼入硬化層の深さとがほぼ均等であっ
て、しかもカム部３の全周にわたって均一な焼入硬化層
パターンＳ1 ，Ｓ2 となる。As shown in FIGS. 3 and 4, the hardened layer pattern obtained on the outer peripheral surface 3a of the cam portion 3a by performing the above-described induction hardening method is hardened at the cam top side portion 3c. The depth of the hardened layer and the depth of the hardened hardened layer in the cam heel side portion 3b are substantially equal, and the hardened hardened layer patterns S 1 and S 2 are uniform over the entire circumference of the cam portion 3.
【００２３】次に、図１及び図２に示す断面円形の高周
波誘導加熱コイル５を用いてカムシャフト１のカム部３
を高周波焼入した後に、後続の工程において、同一の断
面円形の高周波誘導加熱コイル５を用いてカムシャフト
１のジャーナル部２を高周波焼入する場合の高周波焼入
方法について図５及び図６を参照して説明する。Next, using the high frequency induction heating coil 5 having a circular cross section shown in FIGS.
After the induction hardening, the induction hardening method when the journal portion 2 of the camshaft 1 is induction hardened using the high frequency induction heating coil 5 having the same circular cross section in the subsequent process is shown in FIGS. It will be described with reference to FIG.
【００２４】まず、ジャーナル部２の幅Ｗ2 がカム部３
の幅Ｗ1 に等しい場合（図５（ｂ）参照）には、カムシ
ャフト１の軸線αと高周波誘導加熱コイル５の軸線βを
互いに一致させた状態にして、高周波誘導加熱コイル５
をカム部３からジャーナル部２に軸線α，βに沿って移
動させ、高周波誘導加熱コイル５の中空部内にジャーナ
ル部２を配置する。次いで、カムシャフト１を軸線αを
中心に回転させながらジャーナル部２の外周表面２ａを
高周波誘導加熱コイル５にて所要時間にわたって高周波
誘導加熱を行い、加熱終了直後、或いは、加熱終了時か
ら所要時間の経過後に、高周波誘導加熱コイル５を非通
電状態にすると共に、図外の冷却液供給手段により焼入
冷却液を高周波誘導加熱コイル５の焼入冷却液噴射孔１
２からジャーナル部２の外周表面２ａに向けて噴射して
冷却を行う。これにより、ジャーナル部２の高周波焼入
を完了する。First, the width W 2 of the journal portion 2 is
Is equal to the width W 1 in (see FIG. 5 (b)) is, in the state where each other to match the axis β of the axis α and a high-frequency induction heating coil 5 of the camshaft 1, the high-frequency induction heating coil 5
Is moved from the cam portion 3 to the journal portion 2 along the axes α and β, and the journal portion 2 is arranged in the hollow portion of the high-frequency induction heating coil 5. Next, while rotating the camshaft 1 about the axis α, the outer peripheral surface 2a of the journal portion 2 is subjected to high-frequency induction heating by the high-frequency induction heating coil 5 for a required time, and immediately after the completion of the heating or the required time from the end of the heating. After the operation, the high-frequency induction heating coil 5 is de-energized, and the quenching coolant is supplied to the quenching coolant injection hole 1 of the high-frequency induction heating coil 5 by a coolant supply means (not shown).
2 to the outer peripheral surface 2a of the journal portion 2 to perform cooling. Thereby, induction hardening of the journal part 2 is completed.
【００２５】また、図６に示すように、ジャーナル部２
の幅Ｗ3 がカム部３の幅Ｗ1 よりも大きい場合には、次
のようにしてジャーナル部２を高周波焼入する。まず、
図６（ａ）に示すように、高周波誘導加熱コイル５をジ
ャーナル部２の一端側の所定の位置に配置し、カムシャ
フト１を図外の回転機構によって回転させながら高周波
誘導加熱を開始する。そして、ジャーナル部２の外周表
面を高周波誘導加熱しながら高周波誘導加熱コイル５を
軸線αに沿ってジャーナル部２の他端に向かって移動さ
せ、高周波誘導加熱コイル５がジャーナル部２の他端側
の所定の位置に達したら（図６（ｂ）参照）、高周波誘
導加熱を開始した端部の側に向かって高周波誘導加熱コ
イル５を移動（戻り移動）させつつ誘導加熱誘導加熱を
継続し、図６（ａ）〜（ｄ）に示す操作を順次に所要回
数だけ繰り返し施行する。このような操作を必要回数だ
け行ってジャーナル部２の外周表面２ａを往復加熱した
後に、高周波誘導加熱コイル５を非通電状態にすると共
に、高周波誘導加熱コイル５の往復移動を継続させなが
ら高周波誘導加熱コイル５の焼入冷却液噴射孔６より焼
入冷却液を加熱状態のジャーナル部２の外周表面２ａに
噴射してジャーナル部２の外周表面２ａの全域を冷却
（急冷）する。これにより、カム部焼入用の高周波誘導
加熱コイル５を使用してカム部３よりも幅広なジャーナ
ル部２を高周波焼入する。Further, as shown in FIG.
If the width W 3 is larger than the width W 1 of cam portion 3 induction hardening the journal portion 2 in the following manner. First,
As shown in FIG. 6A, the high-frequency induction heating coil 5 is arranged at a predetermined position on one end side of the journal portion 2, and the high-frequency induction heating is started while rotating the camshaft 1 by a rotation mechanism (not shown). Then, the high-frequency induction heating coil 5 is moved along the axis α toward the other end of the journal portion 2 while the outer peripheral surface of the journal portion 2 is subjected to high-frequency induction heating. (See FIG. 6 (b)), the induction heating induction heating is continued while moving (returning) the high frequency induction heating coil 5 toward the end where the high frequency induction heating was started, The operations shown in FIGS. 6A to 6D are sequentially and repeatedly performed a required number of times. After performing such operations as many times as necessary to reciprocally heat the outer peripheral surface 2a of the journal portion 2, the high-frequency induction heating coil 5 is de-energized, and the high-frequency induction heating coil 5 is continuously reciprocated. The quenching coolant is injected from the quenching coolant injection hole 6 of the heating coil 5 to the outer peripheral surface 2a of the journal portion 2 in a heated state to cool (rapidly cool) the entire outer peripheral surface 2a of the journal portion 2. Thus, the journal portion 2 wider than the cam portion 3 is induction hardened by using the high frequency induction heating coil 5 for hardening the cam portion.
【００２６】次に、本発明の高周波焼入方法の実施例に
ついて具体的に述べると、次の如くである。実施例 （１） 焼入対象（被焼入部）の寸法 （Ａ） カム部 （ａ） べース円の直径 ： １５０ｍｍ （ｂ） カムリフト量 ： ４０ｍｍ （ｃ） カム幅 ： ７０ｍｍ （Ｂ） ジャーナル部 （ａ） 直径 ： １９０ｍｍ （ｂ） ジャーナル幅 ： １５０ｍｍ （２） 高周波焼入条件 （Ａ） カム部 （ａ） 周波数 ： ３.８ＫＨｚ （ｂ） 出力 ： １６０ＫＷ （ｃ） 加熱時間 ： １３ｓｅｃ （ｄ） 空冷時間 ： １ｓｅｃ （ｅ） 冷却時間 ： ３０ｓｅｃ （ｆ） 焼入冷却液 ： ユーコンクエンチャントＩｎ
（１０％水溶液） （ｇ） 焼入冷却液の流量 ： １８０Ｌ／ｍｉｎ （ｈ） 焼入冷却液の液温 ： ３０℃ （Ｂ） ジャーナル部 （ａ） 周波数 ： ４.０ＫＨｚ （ｂ） 出力 ： １８０ＫＷ （ｃ） 加熱時間 ： ２０ｓｅｃ （ｄ） 空冷時間 ： １ｓｅｃ （ｅ） 冷却時間 ： １４０ｓｅｃ （ｆ） 焼入冷却液 ： ユーコンクエンチャントＩｎ
（１０％水溶液） （ｇ） 焼入冷却液の流量 ： ２００Ｌ／ｍｉｎ （ｈ） 焼入冷却液の液温 ： ３０℃Next, an embodiment of the induction hardening method of the present invention will be specifically described as follows. Example (1) Dimension of quenched object (hardened part) (A) Cam part (a) Diameter of base circle: 150 mm (b) Cam lift amount: 40 mm (c) Cam width: 70 mm (B) Journal part (A) Diameter: 190 mm (b) Journal width: 150 mm (2) Induction hardening conditions (A) Cam part (a) Frequency: 3.8 KHz (b) Output: 160 KW (c) Heating time: 13 sec (d) Air cooling Time: 1 sec (e) Cooling time: 30 sec (f) Quenching coolant: Yukon Quenchant In
(10% aqueous solution) (g) Flow rate of quenching coolant: 180 L / min (h) Liquid temperature of quenching coolant: 30 ° C. (B) Journal part (a) Frequency: 4.0 KHz (b) Output: 180 KW (C) Heating time: 20 sec (d) Air cooling time: 1 sec (e) Cooling time: 140 sec (f) Quenching coolant: Yukon Quenchant In
(10% aqueous solution) (g) Flow rate of quenching coolant: 200 L / min (h) Liquid temperature of quenching coolant: 30 ° C.
【００２７】以上、本発明の実施形態につき述べたが、
本発明はこの実施形態に限定されるものではなく、本発
明の技術的思想に基づいて各種の変形及び変更が可能で
ある。例えば、既述の実施形態においては断面形状が非
対称なカム部３を高周波焼入する場合の例を示したが、
線対称なカム部についても本発明の高周波焼入方法を適
用して高周波焼入することが可能である。The embodiments of the present invention have been described above.
The present invention is not limited to this embodiment, and various modifications and changes can be made based on the technical idea of the present invention. For example, in the above-described embodiment, an example in which the cam portion 3 having an asymmetric cross-sectional shape is induction hardened has been described.
The induction hardening method of the present invention can be applied to the cam portion which is symmetrical with the line to perform the induction hardening.
【００２８】また、以上においては、高周波焼入につい
ての説明のみを行ったが、本発明の高周波焼入方法は、
カム部３やジャーナル部２の高周波焼戻にも適用し得
る。従って、本明細書において、「高周波焼入」の概念
の中に「高周波焼戻」の概念も含まれるものとする。In the above, only the induction hardening has been described.
The present invention can also be applied to induction tempering of the cam portion 3 and the journal portion 2. Therefore, in this specification, the concept of "induction tempering" is also included in the concept of "induction hardening".
【００２９】そして、複数のカム部３を有するカムシャ
フト１に対しても複数の同一形状の円形コイルを使用し
て、同位相のカム部３に対しては複数の円形コイルを同
一方向にオフセット（偏倚）させ、位相が異なるカム部
であれば複数の断面円形の高周波誘導加熱コイル５を各
々のカム部３の位相に合わせてオフセットさせることに
より、高周波焼入（高周波焼戻を含む）を行うことが可
能である。Also, a plurality of circular coils of the same shape are used for the camshaft 1 having a plurality of cam portions 3, and a plurality of circular coils are offset in the same direction for the cam portions 3 of the same phase. If the cam portions have different phases, high-frequency quenching (including high-frequency tempering) is performed by offsetting a plurality of high-frequency induction heating coils 5 having a circular cross section in accordance with the phase of each cam portion 3. It is possible to do.
【００３０】[0030]
【発明の効果】以上の如く、請求項１に記載の本発明
は、断面円形の高周波誘導加熱コイルを用い、断面円形
の高周波誘導加熱コイルの軸線をカムシャフトの軸線に
対してオフセットした位置に配置してカム部の外周表面
の各部と断面円形の高周波誘導加熱コイルの内周面との
間の間隔を所要の距離に保持し、この状態の下で、カム
シャフトを回転させることなく静止状態のままカム部の
外周表面を高周波誘導加熱して冷却を行うようにしたも
のであるから、高周波誘導加熱コイルの軸線とカムシャ
フトの軸線とのオフセット量（オフセット距離）を適宜
に設定することによって、カム部の外周表面の全域にわ
たって均一な焼入硬化層パターン、すなわち、カムヒー
ル側部分に形成される焼入硬化層の深さとカムトップ側
部分に形成される焼入硬化層の深さがほぼ均等な焼入硬
化層パターンを得ることができる。また、カム部を高周
波焼入（輪郭焼入）するために単純な構造の断面円形の
高周波誘導加熱コイルを使用しているので、分割開閉構
造を備える割型コイルを使用する場合に比べて、高周波
誘導加熱コイルを安価なもので済ませることができる。
さらに、割型コイルの場合とは異なり高周波誘導加熱コ
イルの分割開閉機構及び電気接触部の押圧機構が不要と
なるため、本発明の高周波焼入方法を施行するための高
周波焼入装置も安価なものとなるという利点がある。As described above, according to the first aspect of the present invention, a high-frequency induction heating coil having a circular cross section is used, and the axis of the high-frequency induction heating coil having a circular cross section is offset from the axis of the camshaft. Arranged to maintain the space between each part of the outer peripheral surface of the cam part and the inner peripheral surface of the high-frequency induction heating coil having a circular cross section at a required distance, and in this state, the stationary state without rotating the cam shaft Since the outer peripheral surface of the cam portion is cooled by high-frequency induction heating as it is, by appropriately setting the offset amount (offset distance) between the axis of the high-frequency induction heating coil and the axis of the camshaft. The hardened layer pattern is uniform over the entire outer peripheral surface of the cam portion, that is, the hardened layer formed on the cam heel side and the hardened layer formed on the cam top side. The depth of the hardened layer can be obtained substantially uniform hardened layer pattern. In addition, since a high frequency induction heating coil having a simple structure and a circular cross section is used for induction hardening (contour quenching) the cam portion, compared to the case of using a split coil having a split opening and closing structure, The high frequency induction heating coil can be inexpensive.
Furthermore, unlike the split type coil, since the split opening / closing mechanism of the high frequency induction heating coil and the pressing mechanism of the electric contact portion are not required, the high frequency quenching apparatus for performing the high frequency quenching method of the present invention is also inexpensive. There is an advantage that it becomes.
【００３１】また、請求項２に記載の本発明は、カムシ
ャフトのジャーナル部の外周表面を、カム部の外周表面
を高周波誘導加熱する断面円形の高周波誘導加熱コイル
と同一のもので高周波誘導加熱して冷却を行うことによ
り、高周波焼入するようにしたものであるから、同一の
高周波誘導加熱コイルにてカム部並びにジャーナル部の
両方を高周波焼入することが可能となるため、高周波誘
導加熱コイルの台数を大幅に減らすことができる。According to a second aspect of the present invention, the outer peripheral surface of the journal portion of the camshaft is the same as a high-frequency induction heating coil having a circular cross section for high-frequency induction heating of the outer peripheral surface of the cam portion. In this case, since both the cam section and the journal section can be induction-hardened with the same high-frequency induction heating coil, high-frequency induction heating is performed. The number of coils can be greatly reduced.
【００３２】また、請求項３に記載の本発明は、ジャー
ナル部における焼入幅がカム部の幅よりも広い場合に
は、断面円形の高周波誘導加熱コイルをカムシャフトの
軸線に沿って平行にジャーナル部の焼入対象領域の一端
位置と他端位置との間を所要回数にわたり移動させるこ
とにより、ジャーナル部の焼入対象領域の全体を高周波
誘導加熱して冷却を行うようにしたものであるから、ジ
ャーナル部における焼入幅がカム部の幅よりも広くても
同一の高周波誘導加熱コイルを用いてカム部及びジャー
ナル部を高周波誘導加熱することができる。According to a third aspect of the present invention, when the quenching width in the journal portion is wider than the width of the cam portion, the high-frequency induction heating coil having a circular cross section is parallel to the axis of the camshaft. By moving between the one end position and the other end position of the quenching target region of the journal portion a required number of times, the entire quenching target region of the journal portion is subjected to high-frequency induction heating to perform cooling. Therefore, even when the quenching width in the journal portion is wider than the width of the cam portion, the cam portion and the journal portion can be subjected to high-frequency induction heating using the same high-frequency induction heating coil.
【図１】本発明の高周波焼入方法を説明するための図面
であって、図１（ａ）はカムシャフトのカム部を断面円
形の高周波誘導加熱コイル内に軸線を互いに一致させて
配置した状態を示す側面図、図１（ｂ）は同上の断面図
である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining an induction hardening method of the present invention, and FIG. 1 (a) shows a cam portion of a camshaft arranged in a high-frequency induction heating coil having a circular cross section so that axes thereof are aligned with each other. FIG. 1B is a side view showing the state, and FIG.
【図２】本発明の高周波焼入方法を説明するための図面
であって、図２（ａ）はカムシャフトのカム部を断面円
形の高周波誘導加熱コイル内においてオフセットした位
置に配置した状態を示す側面図、図２（ｂ）は同上の断
面図である。FIG. 2 is a view for explaining the induction hardening method of the present invention, and FIG. 2 (a) shows a state where a cam portion of a camshaft is arranged at an offset position in a high-frequency induction heating coil having a circular cross section. FIG. 2B is a cross-sectional view of the above.
【図３】図３（ａ）は、本発明の高周波焼入方法により
カム部の外周表面に得られる焼入硬化層パターンを示す
縦断面図、図３（ｂ）は同上の横断面図である。FIG. 3A is a longitudinal sectional view showing a quench hardened layer pattern obtained on the outer peripheral surface of a cam portion by the induction hardening method of the present invention, and FIG. 3B is a transverse sectional view of the same. is there.
【図４】図４（ａ）は本発明の高周波焼入方法によりカ
ム部の外周表面に得られる焼入硬化層パターンを示す縦
断面図、図４（ｂ）は同上の横断面図である。FIG. 4 (a) is a longitudinal sectional view showing a quench hardened layer pattern obtained on the outer peripheral surface of a cam portion by the induction hardening method of the present invention, and FIG. 4 (b) is a transverse sectional view of the same. .
【図５】ジャーナル部の焼入幅がカム部の幅と同じ場合
に、本発明の高周波焼入方法を施行する際の状況を説明
するためのものであって、図５（ａ）は図１（ａ）と同
様の側面図、図５（ｂ）は図１（ｂ）と同様の断面図で
ある。FIG. 5 is a diagram for explaining a situation when the induction hardening method of the present invention is performed when the quenching width of the journal portion is the same as the width of the cam portion, and FIG. 1 (a) is a side view, and FIG. 5 (b) is a sectional view similar to FIG. 1 (b).
【図６】ジャーナル部の焼入幅がカム部の幅よりも大き
い場合に、本発明の高周波焼入方法を施行する際の状況
を説明するためのものであって、図６（ａ）〜（ｄ）は
ジャール部を高周波誘導加熱する際の高周波誘導加熱コ
イルの移動状況を示すための断面図である。FIG. 6 is a diagram for explaining a situation when the induction hardening method of the present invention is performed when the quenching width of the journal portion is larger than the width of the cam portion, and FIGS. (D) is a cross-sectional view showing a moving state of the high-frequency induction heating coil when the jar portion is subjected to high-frequency induction heating.
【図７】カムシャフトの正面図である。FIG. 7 is a front view of the camshaft.
【図８】カムシャフトのジャーナル部の側面図である。FIG. 8 is a side view of a journal portion of the camshaft.
【図９】図９（ａ）及び（ｂ）はカムシャフトのカム部
の側面図である。FIGS. 9A and 9B are side views of the cam portion of the camshaft.
【図１０】カムシャフトの外周表面を輪郭焼入するため
の従来の高周波焼入方法を説明するための図面であっ
て、図１０（ａ）は図１と同様の側面図、図１０（ｂ）
は図１（ｂ）と同様の断面図である。10A and 10B are drawings for explaining a conventional induction hardening method for contour hardening the outer peripheral surface of the camshaft. FIG. 10A is a side view similar to FIG. )
FIG. 2 is a sectional view similar to FIG.
【図１１】図１１（ａ）は従来の高周波焼入方法により
カム部の外周表面に得られる焼入硬化層パターンを示す
縦断面図、図１１（ｂ）は同上の横断面図である。11 (a) is a longitudinal sectional view showing a quench hardened layer pattern obtained on the outer peripheral surface of a cam portion by a conventional induction hardening method, and FIG. 11 (b) is a transverse sectional view of the same.
【図１２】カム部の外周表面の形状に相似する形状の内
周面を有する高周波誘導加熱コイルにてカム部を高周波
の外周表面を高周波誘導加熱するようにした従来の高周
波誘導加熱方法を示すものであって、図１２（ａ）は高
周波誘導加熱コイルの側面図、図１２（ｂ）は同上の断
面図である。FIG. 12 shows a conventional high-frequency induction heating method in which a high-frequency induction heating is performed on a high-frequency outer peripheral surface of a cam portion by a high-frequency induction heating coil having an inner peripheral surface having a shape similar to the shape of the outer peripheral surface of the cam portion. FIG. 12A is a side view of a high-frequency induction heating coil, and FIG. 12B is a sectional view of the same.
【図１３】カムシャフトのジャーナル部及びカム部の寸
法の違いを示すカムシャフトの正面図である。FIG. 13 is a front view of the camshaft showing a difference in dimensions of a journal portion and a cam portion of the camshaft.
【図１４】図１４（ａ）は、従来の高周波誘導加熱方法
を施行するために用いられる分割開閉型の高周波誘導加
熱コイルを示す側面図、図１４（ｂ）は同上の断面図で
ある。FIG. 14 (a) is a side view showing a split open / close type high frequency induction heating coil used for implementing a conventional high frequency induction heating method, and FIG. 14 (b) is a sectional view of the same.
１ カムシャフト ２ ジャーナル部 ２ａ 外周表面 ３ カム部 ３ａ カムヒール側部分 ３ｂ カムトップ側部分 ３ｃ 外周表面 ４ 高周波電源（高周波発振器） ５ 断面円形の高周波誘導加熱コイル ５ａ 内周面 ６ 焼入冷却液噴射孔 α カムシャフトの軸線 β 高周波誘導加熱コイルの軸線 Ｘ，Ｙ オフセット距離 DESCRIPTION OF SYMBOLS 1 Camshaft 2 Journal part 2a Outer peripheral surface 3 Cam part 3a Cam heel side part 3b Cam top side part 3c Outer peripheral surface 4 High frequency power supply (high frequency oscillator) 5 High frequency induction heating coil having a circular cross section 5a Inner peripheral surface 6 Quenched cooling liquid injection hole α Axis line of camshaft β Axis line of high frequency induction heating coil X, Y Offset distance
Claims (3)
波誘導加熱コイルにて高周波誘導加熱して冷却すること
により、前記カム部の外周表面に沿った領域に焼入硬化
層を形成するようにしたカムシャフトの高周波焼入方法
において、断面円形の高周波誘導加熱コイルを用い、前
記断面円形の高周波誘導加熱コイルの軸線を前記カムシ
ャフトの軸線に対してオフセットした位置に配置して前
記カム部の外周表面の各部と前記断面円形の高周波誘導
加熱コイルの内周面との間の間隔を所要の距離に保持
し、この状態の下で、前記カムシャフトを回転させるこ
となく静止状態のまま前記カム部の外周表面を高周波誘
導加熱して冷却を行うようにしたことを特徴とするカム
シャフトの高周波焼入方法。1. A quenched and hardened layer is formed in a region along the outer peripheral surface of the cam portion by cooling the outer peripheral surface of the cam portion of the cam shaft by high frequency induction heating with a high frequency induction heating coil. In the induction hardening method of the camshaft, a high-frequency induction heating coil having a circular cross section is used, and the axis of the high-frequency induction heating coil having the circular cross section is arranged at a position offset with respect to the axis of the camshaft. The interval between each part of the outer peripheral surface and the inner peripheral surface of the high-frequency induction heating coil having a circular cross section is maintained at a required distance, and in this state, the cam is kept stationary without rotating the cam shaft. A high-frequency induction hardening method for a camshaft, characterized in that the outer peripheral surface of the part is cooled by high-frequency induction heating.
表面を、前記カム部の外周表面を高周波誘導加熱する前
記断面円形の高周波誘導加熱コイルと同一のもので高周
波誘導加熱して冷却を行うことにより、高周波焼入する
ようにしたことを特徴とする請求項１に記載の高周波焼
入方法。2. An outer peripheral surface of a journal portion of the camshaft is cooled by high-frequency induction heating using the same high-frequency induction heating coil having a circular cross section for high-frequency induction heating of an outer peripheral surface of the cam portion. The induction hardening method according to claim 1, wherein the induction hardening is performed.
カム部の幅よりも広い場合には、前記断面円形の高周波
誘導加熱コイルを前記カムシャフトの軸線に沿って平行
に前記ジャーナル部の焼入対象領域の一端位置と他端位
置との間を所要回数にわたり移動させることにより、前
記ジャーナル部の焼入対象領域の全体を高周波誘導加熱
して冷却を行うようにしたことを特徴とする請求項２に
記載のカムシャフトの高周波焼入方法。3. When the quenching width of the journal portion is wider than the width of the cam portion, the high frequency induction heating coil having a circular cross section is hardened in parallel with the axis of the cam shaft. The quenching target area of the journal portion is entirely subjected to high-frequency induction heating to be cooled by moving between the one end position and the other end position of the target region a required number of times. 3. The method of induction hardening of a camshaft according to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001163938A JP4508473B2 (en) | 2001-05-31 | 2001-05-31 | Induction hardening method of camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001163938A JP4508473B2 (en) | 2001-05-31 | 2001-05-31 | Induction hardening method of camshaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002356719A true JP2002356719A (en) | 2002-12-13 |
| JP4508473B2 JP4508473B2 (en) | 2010-07-21 |
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|---|---|---|---|
| JP2001163938A Expired - Fee Related JP4508473B2 (en) | 2001-05-31 | 2001-05-31 | Induction hardening method of camshaft |
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Cited By (6)
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| JP2008063627A (en) * | 2006-09-08 | 2008-03-21 | Denki Kogyo Co Ltd | High-frequency induction tempering method for crank shaft and high-frequency induction heating coil body used for the high-frequency induction tempering method |
| CN102492822A (en) * | 2011-12-28 | 2012-06-13 | 重庆大学 | Cam conjugate induction hardening equipment |
| JP2013023740A (en) * | 2011-07-22 | 2013-02-04 | Denki Kogyo Co Ltd | High frequency induction heating coil and high-frequency induction heating method |
| JP2014122374A (en) * | 2012-12-20 | 2014-07-03 | Toyota Motor Corp | Method for producing cam shaft |
| EP3103313A4 (en) * | 2014-02-09 | 2017-12-06 | Inductoheat, Inc. | Single shot inductor for heat treatment of closely spaced multiple eccentric cylindrical components arranged along the longitudinal axis of a workpiece |
| US10602571B2 (en) | 2016-03-18 | 2020-03-24 | Toyota Jidosha Kabushiki Kaisha | Heat treatment method for cam piece |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102952925B (en) * | 2011-08-26 | 2015-04-22 | 新大洲本田摩托有限公司 | Heating and quenching sensor for cams |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008063627A (en) * | 2006-09-08 | 2008-03-21 | Denki Kogyo Co Ltd | High-frequency induction tempering method for crank shaft and high-frequency induction heating coil body used for the high-frequency induction tempering method |
| JP2013023740A (en) * | 2011-07-22 | 2013-02-04 | Denki Kogyo Co Ltd | High frequency induction heating coil and high-frequency induction heating method |
| CN102492822A (en) * | 2011-12-28 | 2012-06-13 | 重庆大学 | Cam conjugate induction hardening equipment |
| JP2014122374A (en) * | 2012-12-20 | 2014-07-03 | Toyota Motor Corp | Method for producing cam shaft |
| EP3103313A4 (en) * | 2014-02-09 | 2017-12-06 | Inductoheat, Inc. | Single shot inductor for heat treatment of closely spaced multiple eccentric cylindrical components arranged along the longitudinal axis of a workpiece |
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| US10602571B2 (en) | 2016-03-18 | 2020-03-24 | Toyota Jidosha Kabushiki Kaisha | Heat treatment method for cam piece |
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