JP2005344193A - High frequency-induction hardening method - Google Patents

High frequency-induction hardening method Download PDF

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JP2005344193A
JP2005344193A JP2004168039A JP2004168039A JP2005344193A JP 2005344193 A JP2005344193 A JP 2005344193A JP 2004168039 A JP2004168039 A JP 2004168039A JP 2004168039 A JP2004168039 A JP 2004168039A JP 2005344193 A JP2005344193 A JP 2005344193A
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induction heating
camshaft
hardening
high frequency
heating coil
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Seiichi Sawatsubashi
精一 沢津橋
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DKK Co Ltd
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Denki Kogyo Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02P10/00—Technologies related to metal processing
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency-induction hardening method with which in the case of performing the high frequency-induction hardening to a plurality of hardening objective parts by using a simple high frequency-induction heating coil, the working efficiency can be improved by obtaining the shortening of the high frequency-induction hardening treatment and the space needed to the high frequency-induction hardening treatment can be minimized. <P>SOLUTION: In the high frequency-induction hardening method, by which the respective plurality of positions in the hardening objective parts are hardened in order by cooling after high frequency-induction heating to the plurality of positions of hardening object parts (e.g. the outer peripheral surface 3a of a cum part 3 in a cum shaft 2) while relatively shifting the single high frequency-induction heating coil 4 and the hardening objective (e.g. a cam shaft 1 for engine), the hardening treatment is performed to the plurality of positions of the hardening objective parts in order by simultaneously shifting the high frequency-induction heating coil and the hardening object part to mutually reverse direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、高周波焼入方法に関し、さらに詳しくは、例えばエンジンのカムシャフトのように軸線方向に沿って配設された複数箇所のカム部に高周波焼入が必要な焼入対象物（ワーク）を、単一の高周波誘導加熱コイルを用いて移動焼入するための高周波焼入方法に関する。   The present invention relates to an induction hardening method, and more specifically, for example, a hardened object (work) that requires induction hardening at a plurality of cam portions arranged along an axial direction such as an engine camshaft. The present invention relates to an induction hardening method for transfer hardening using a single induction heating coil.

図２（ａ）は、エンジンのカムシャフト（焼入対象物としてのワーク）１を模式的に示したものである。このカムシャフト１は、図２（ａ）に示すように、直線状の軸線αを有する互いに同軸状の複数のジャーナル部（シャフト部）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。１つのカムシャフト１に備えられている複数のカム部３の外周面（カム面）３ａは、単一の高周波誘導加熱コイル４を用いて高周波焼入処理が順次に施されるようになっている。   FIG. 2 (a) schematically shows a camshaft (work as an object to be hardened) 1 of the engine. As shown in FIG. 2A, the camshaft 1 is disposed between a plurality of coaxial journal portions (shaft portions) 2 having a linear axis α and adjacent journal portions 2. And a plurality of cam portions 3. An outer peripheral surface (cam surface) 3a of a plurality of cam portions 3 provided in one camshaft 1 is sequentially subjected to induction hardening using a single induction induction coil 4. Yes.

ここでは、説明の都合上、焼入対象部である複数のカム部３は、一例として、互いに同一の形状であり、かつ、互いに隣り合う一対のカム部３，３間の間隔（ピッチ）Ｗが各部において同一であると共に、これら一対のカム部３，３とこれに隣接する一対のカム部３，３との間の間隔Ｌが各部において同一であるとする。なお、図２（ｂ）は、図２（ａ）の単一の高周波誘導加熱コイル４及びカムシャフト１を模式的に表示したものであり、カムシャフト各部の軸線α方向に沿う寸法は、一例として、図示の寸法であるものとする。   Here, for convenience of explanation, as an example, the plurality of cam portions 3 that are quenching target portions have the same shape as each other, and an interval (pitch) W between a pair of adjacent cam portions 3 and 3. Are the same in each part, and the distance L between the pair of cam parts 3 and 3 and the pair of cam parts 3 and 3 adjacent thereto is the same in each part. FIG. 2B schematically shows the single high-frequency induction heating coil 4 and the camshaft 1 of FIG. 2A, and the dimensions along the axis α direction of each part of the camshaft are an example. As shown in FIG.

図２（ｂ）に示すカムシャフト１のカム部３の外周面３ａを順次に高周波焼入（カム部輪郭焼入）するには、単一の高周波誘導加熱コイル４とカムシャフト１とを相対向する位置に位置決めし（例えば、図２（ａ）参照）、所定の高周波焼入条件に基づいて単一の高周波誘導加熱コイル４にてカム部３の外周面３ａを高周波誘導加熱した後に冷却することにより行う。１つの高周波焼入条件として、周波数３０ｋＨｚ，出力１３５ｋＷ，加熱時間３秒，焼入冷却時間６秒とし、カムシャフト１の複数のカム部３の全てを高周波焼入する場合の作業時間について、以下に説明する。   In order to sequentially induction-harden the outer peripheral surface 3a of the cam portion 3 of the camshaft 1 shown in FIG. 2B (cam portion contour hardening), the single high-frequency induction heating coil 4 and the camshaft 1 are relatively (See, for example, FIG. 2 (a)), the outer peripheral surface 3a of the cam portion 3 is cooled by high frequency induction heating with a single high frequency induction heating coil 4 based on predetermined induction hardening conditions. To do. As one induction hardening condition, the frequency is 30 kHz, the output is 135 kW, the heating time is 3 seconds, the quenching and cooling time is 6 seconds, and the work time in the case of induction hardening all of the plurality of cam portions 3 of the camshaft 1 is as follows. Explained.

単一の高周波誘導加熱コイル４によりカムシャフト１のカム部を高周波焼入する方式としては、従来より２通りの方式が採用されている。その１つは、カムシャフト１を所定位置に固定しておき、単一の高周波誘導加熱コイル４をカムシャフト１のジャーナル部２の軸線α方向に沿う一方向に順次に移動してカムシャフト１の外周面３ａと相対向する位置に位置決めした状態で前記外周面３ａを高周波誘導加熱して焼入処理を行なうコイル移動方式と、これとは逆に、単一の高周波誘導加熱コイル４を所定位置に固定しておき、カムシャフト１を軸線α方向に沿う一方向に移動して高周波誘導加熱コイル４と相対向する位置に位置決めした状態で前記外周面３ａを高周波誘導加熱して焼入処理を行なうワーク移動方式とが挙げられる。   As a method of induction hardening the cam portion of the camshaft 1 with a single high frequency induction heating coil 4, two methods are conventionally employed. One of them is that the camshaft 1 is fixed at a predetermined position, and the single high-frequency induction heating coil 4 is sequentially moved in one direction along the direction of the axis α of the journal portion 2 of the camshaft 1. In contrast to the coil moving method in which the outer peripheral surface 3a is positioned at a position opposite to the outer peripheral surface 3a and the outer peripheral surface 3a is subjected to quenching by high-frequency induction heating, a single high-frequency induction heating coil 4 is provided in a predetermined manner. The outer peripheral surface 3a is subjected to quenching treatment by high-frequency induction heating while the camshaft 1 is moved in one direction along the axis α direction and positioned at a position opposite to the high-frequency induction heating coil 4 while being fixed at a position. And a workpiece moving system for performing the above.

図３は、コイル移動方式の高周波焼入方法を示すものである。なお、この場合、単一の高周波誘導加熱コイル４及びカムシャフト１の関係位置やカムシャフト１のカム部３の寸法関係は、一例として、図示のものとする。また、単一の高周波誘導加熱コイル４の軸線方向への移動速度について、往路は３０ｍｍ／秒であり、復路は７０ｍｍ／秒であるとする。勿論、これに限定するものではない。   FIG. 3 shows a coil moving type induction hardening method. In this case, the relationship between the single high-frequency induction heating coil 4 and the camshaft 1 and the dimensional relationship of the cam portion 3 of the camshaft 1 are illustrated as an example. Further, regarding the moving speed of the single high-frequency induction heating coil 4 in the axial direction, it is assumed that the forward path is 30 mm / second and the backward path is 70 mm / second. Of course, it is not limited to this.

コイル移動方式の高周波焼入方法を施行に際しては、図３（ａ）に示す如くカムシャフト１から離れた初期位置Ｐ０に配置された単一の高周波誘導加熱コイル４は、図３（ｂ）に示すように図３（ａ）の初期位置Ｐ０より１２０ｍｍだけ軸線α方向に沿って移動し、第１番目のカム部３，３と合致（対向）する位置Ｐ１にくる。この状態の下で、所定の焼入条件によって高周波焼入が行われる。この際の移動に要する時間（移動所要時間）は、既述のように加熱時間と焼入冷却時間とを合わせて９秒となる。次に、単一の高周波誘導加熱コイル４は図３（ｃ）に示すように１００ｍｍだけ軸線方向（図３において右側に向かう往路方向）に沿って移動し、第２番目のカム部３，３と合致する位置Ｐ２に移動し、上記と同様にこの部分の高周波焼入を行なう。以下、同様に図３（ｄ），（ｅ）にそれぞれ示すように単一の高周波誘導加熱コイル４は軸線α方向に沿って移動し、図３（ｅ）に示す位置Ｐ３を経て最終位置Ｐ４まで移動し、カムシャフト１の全てのカム部３の焼入処理が終了する。そして、焼入処理の終了後に、単一の高周波誘導加熱コイル４を復路に沿って逆方向に移動し、図３（ａ）に示す位置まで順次に移動させて一連の焼入処理作業を終了する。なお、第１番目〜第４番目のカム部３，３には、それぞれ、高周波誘導加熱が施された直後に冷却液が噴射されて焼入冷却がなされてその外周面３ａに焼入硬化層が形成される。   When the induction hardening method of the coil movement method is performed, the single high frequency induction heating coil 4 arranged at the initial position P0 away from the camshaft 1 as shown in FIG. As shown in FIG. 3A, it moves along the axis α direction by 120 mm from the initial position P0 in FIG. 3A, and comes to a position P1 that matches (opposes) the first cam portions 3 and 3. Under this state, induction hardening is performed under predetermined hardening conditions. The time required for movement at this time (time required for movement) is 9 seconds in total, as described above, including the heating time and the quenching and cooling time. Next, as shown in FIG. 3C, the single high-frequency induction heating coil 4 moves by 100 mm along the axial direction (the outward direction toward the right side in FIG. 3), and the second cam portions 3, 3 are moved. To the position P2 that coincides with this, and induction hardening of this portion is performed in the same manner as described above. Similarly, as shown in FIGS. 3D and 3E, the single high-frequency induction heating coil 4 moves along the direction of the axis α and passes through the position P3 shown in FIG. 3E to the final position P4. The quenching process for all the cam portions 3 of the camshaft 1 is completed. After the quenching process is completed, the single high-frequency induction heating coil 4 is moved in the reverse direction along the return path and sequentially moved to the position shown in FIG. To do. The first to fourth cam portions 3 and 3 are each injected with a cooling liquid immediately after being subjected to high-frequency induction heating, and are quenched and hardened on the outer peripheral surface 3a. Is formed.

このようなコイル移動方法の場合、単一の高周波誘導加熱コイル４の移動に関する時間は、往路では４２０／３０＝１４秒となり、復路では４２０／７０＝６秒となる。従って、全体では１４秒＋６秒＝２０秒となる。そして、焼入冷却時間（第１番目〜第４番目のカム部３，３の焼入冷却時間は、それぞれ、例えば９秒）を加えると、高周波焼入処理のトータルの所要時間は、９秒×４（箇所）＋２０秒＝５６秒である。   In the case of such a coil moving method, the time relating to the movement of the single high-frequency induction heating coil 4 is 420/30 = 14 seconds in the forward path and 420/70 = 6 seconds in the backward path. Therefore, the total is 14 seconds + 6 seconds = 20 seconds. When the quenching and cooling time (the quenching and cooling times of the first to fourth cam portions 3 and 3 are each 9 seconds, for example) is added, the total time required for the induction hardening process is 9 seconds. X4 (location) +20 seconds = 56 seconds.

図４は、ワーク移動方式の場合の高周波焼入方法を示すものである。ワーク移動方式の場合の高周波焼入方法を施行に際しては、図４（ａ）に示す初期位置Ｐ０にあった単一の高周波誘導加熱コイル４とカムシャフト１とは、まず、図４（ｂ）に示すようにカムシャフト１の軸線α方向への移動により第１番目のカム部３，３と単一の高周波誘導加熱コイル４とが合致する位置に位置決めされ、ここで第１番目カム部３，３の高周波焼入が行われる。次に、図４（ｃ），（ｄ）に示すように第２番目及び第３番目のカム部３，３が順次に高周波焼入され、図４（ｅ）において最後の第４番目のカム部３，３が高周波焼入される。しかる後に、カムシャフト１は復路に沿って逆方向に移動され、図４（ａ）に示す初期位置Ｐ０に戻り、一連の焼入処理作業を終了する。なお、第１番目〜第４番目のカム部３，３には、それぞれ、高周波誘導加熱が施された直後に冷却液が噴射されて焼入冷却がなされてその外周面３ａに焼入硬化層が形成される。   FIG. 4 shows an induction hardening method in the case of the workpiece moving method. When the induction hardening method in the case of the workpiece moving method is performed, the single high frequency induction heating coil 4 and the camshaft 1 at the initial position P0 shown in FIG. As shown in FIG. 2, the first cam portions 3 and 3 and the single high-frequency induction heating coil 4 are positioned at positions where the first cam portions 3 and 3 coincide with each other by the movement of the camshaft 1 in the axis α direction. , 3 induction hardening is performed. Next, as shown in FIGS. 4C and 4D, the second and third cam portions 3 and 3 are sequentially induction-hardened, and the last fourth cam in FIG. 4E. Parts 3 and 3 are induction hardened. Thereafter, the camshaft 1 is moved in the reverse direction along the return path, returns to the initial position P0 shown in FIG. 4 (a), and the series of quenching operations is completed. The first to fourth cam portions 3 and 3 are each injected with a cooling liquid immediately after being subjected to high-frequency induction heating, and are quenched and hardened on the outer peripheral surface 3a. Is formed.

このようなワーク移動方式の場合、カムシャフト１の移動に関する時間（移動所要時間）は、往路で４２０／３０＝１４秒となり、復路で４２０／７０＝６秒となり、全体としては１４秒＋６秒＝２０秒の移動時間がかかる。焼入冷部時間を加えると、高周波焼入処理のトータルの所要時間は、上記のコイル移動方法の場合と同様に５６秒となる。   In the case of such a workpiece moving system, the time related to the movement of the camshaft 1 (traveling time) is 420/30 = 14 seconds on the forward path, 420/70 = 6 seconds on the backward path, and 14 seconds + 6 seconds as a whole. = 20 seconds travel time. When the quenching and cooling time is added, the total time required for the induction hardening process is 56 seconds as in the case of the coil moving method.

上述のようにコイル移動方式及びワーク移動方式にあっては、双方とも、移動時間は往路及び復路で２０秒かかり、これに焼入冷却時間である３６秒（但し、ワークの着脱作業は含まない）を加えると、総計で５６秒かかる。なお、単一の高周波誘導加熱コイル４及びカムシャフト１の作業スペース（移動ストローク）としては、コイル移動方式の場合には４８０ｍｍ程度の比較的小さなスペースで済むが、ワーク移動方式の場合には、８２０ｍｍ必要となり、省スペース化に支障を生じるという問題点がある。高周波焼入における作業効率の向上を図る手段としては、高周波焼入の焼入条件を工夫したり、高周波誘導加熱コイルの形状を工夫することが考えられ、これらの手段にて作業効率の向上を図ることができるが、これとは別に、移動時間を短縮することによって直接的な作業効率の向上を図るのが最も望ましい。   As described above, in both the coil movement method and the workpiece movement method, the movement time takes 20 seconds on the forward path and the return path, and this is the quenching and cooling time of 36 seconds (however, the work attachment / detachment work is not included). ), It takes a total of 56 seconds. The working space (movement stroke) of the single high-frequency induction heating coil 4 and camshaft 1 may be a relatively small space of about 480 mm in the case of the coil movement method, but in the case of the workpiece movement method, 820 mm is required, and there is a problem that space saving is hindered. As means for improving the work efficiency in induction hardening, it is conceivable to devise the quenching conditions for induction hardening or the shape of the induction heating coil. Apart from this, it is most desirable to improve the work efficiency directly by reducing the travel time.

本発明は、このような要望を達成すべくなされたものであって、その目的は、単一の高周波誘導加熱コイルを用いて複数の焼入対象部を高周波焼入するに際して、高周波焼入時間の短縮を図り得て作業効率の向上を図ることができ、しかも高周波焼入処理に要するスペースを極力小さく抑える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 to achieve such a demand, and an object of the present invention is to perform induction hardening time when induction hardening a plurality of portions to be quenched using a single induction heating coil. It is an object of the present invention to provide an induction hardening method that can improve the work efficiency and reduce the space required for induction hardening as much as possible.

上述の目的を達成するために、本発明では、単一の高周波誘導加熱コイルと焼入対象物とを相対的に移動させて前記焼入対象物の複数箇所の焼入対象部を高周波誘導加熱した後に冷却することにより、前記複数箇所の焼入対象部のそれぞれを順次に焼入処理するようにした高周波焼入方法において、前記単一の高周波誘導加熱コイル及び前記焼入対象物を互いに逆方向に同時に移動させて前記複数箇所の焼入対象部を順次に焼入処理するようにしている。
また、本発明では、前記焼入対象物がエンジンのカムシャフトであり、前記焼入対象部が前記カムシャフトのカム部であり、前記単一の高周波誘導加熱コイル及び前記焼入対象物の移動方向は、前記カムシャフトのジャーナル部の軸線に沿う方向であるようにしている。 In order to achieve the above-mentioned object, in the present invention, a single high-frequency induction heating coil and a target object to be quenched are relatively moved so that a plurality of target parts to be quenched are subjected to high-frequency induction heating. In the induction hardening method in which each of the plurality of portions to be quenched is sequentially quenched by cooling, the single induction induction coil and the object to be quenched are opposite to each other. The plurality of portions to be quenched are sequentially quenched by moving in the direction at the same time.
In the present invention, the quenching object is a camshaft of an engine, the quenching object part is a cam part of the camshaft, and the single high-frequency induction heating coil and the movement of the quenching object are performed. The direction is a direction along the axis of the journal portion of the camshaft.

請求項１に記載の本発明は、単一の高周波誘導加熱コイル及び前記焼入対象物を互いに逆方向に同時に移動させて焼入対象物の複数箇所の焼入対象部を順次に焼入処理するようにしたものであるから、トータルの移動時間について大幅な短縮化が可能となる。また、作業スペース（移動ストローク）も小さくでき、省スペース化を図ることができる。   The present invention according to claim 1 is a method in which a single high-frequency induction heating coil and the quenching object are simultaneously moved in opposite directions to sequentially quench a plurality of quenching object parts of the quenching object. As a result, the total travel time can be greatly shortened. In addition, the work space (movement stroke) can be reduced, and space saving can be achieved.

また、請求項２に記載の本発明は、焼入対象物がエンジンのカムシャフトであり、焼入対象部がカムシャフトのカム部であり、単一の高周波誘導加熱コイル及び前記焼入対象物の移動方向は、前記カムシャフトのジャーナル部の軸線に沿う方向であるようにしたものであるから、カムシャフトのカム部に焼入処理を施す際の作業効率の向上を図ることが可能となる。   According to the second aspect of the present invention, the object to be hardened is a camshaft of an engine, the part to be hardened is a cam part of the camshaft, a single high-frequency induction heating coil, and the object to be hardened Since the moving direction of the camshaft is a direction along the axis of the journal portion of the camshaft, it is possible to improve the working efficiency when performing a quenching process on the cam portion of the camshaft. .

以下、本発明の一実施形態に係る高周波焼入方法につき図１を参照して説明する。なお、図１において図２〜図４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こととする。   Hereinafter, an induction hardening method according to an embodiment of the present invention will be described with reference to FIG. In FIG. 1, the same parts as those in FIGS. 2 to 4 are denoted by the same reference numerals, and redundant description is omitted.

一方、焼入対象物（ワーク）としては同一形状の焼入箇所を同一間隔で配列して成るものにのみ本発明の高周波誘導加熱方法は適用されるものではなく、種々の異なった形状や異なった間隔のものに対しても適用可能であるが、以下に述べる実施形態では、焼入対象部の形状や間隔が同一のカムシャフト１を焼入対象物とする場合について説明することとする。この場合、単一の高周波誘導加熱コイル４及びカムシャフト１の移動速度は、共に、同一であり、ここでは従来の場合と比較するべく、往路の移動速度を３０ｍｍ／秒とし、復路の移動策度を７０ｍｍ／秒とする。しかし、これは一例であり、これに限定されるものではない。一方、高周波誘導加熱コイルとしては、単一のものが用いられる。   On the other hand, the high frequency induction heating method of the present invention is not applied only to a quenching object (workpiece) in which quenching portions having the same shape are arranged at the same interval, and various different shapes or different Although the present invention can be applied to those having a gap, in the embodiment described below, a case will be described in which the camshaft 1 having the same shape and interval of the quenching target portion is used as the quenching target object. In this case, the moving speeds of the single high-frequency induction heating coil 4 and the camshaft 1 are both the same. Here, in order to compare with the conventional case, the moving speed of the forward path is set to 30 mm / second, and the moving policy of the returning path is The degree is 70 mm / second. However, this is an example, and the present invention is not limited to this. On the other hand, a single thing is used as a high frequency induction heating coil.

本実施形態に使用されるカムシャフト１としては図２（ａ），（ｂ）に示すものが採用され、そのカム部３の形状や互いに隣り合うカム部３，３間の間隔（ピッチ）Ｗ並びに大１〜第４のカム部間の間隔Ｌは同一であり、図示の寸法のものからなる。また、高周波焼入処理の開始時における単一の高周波誘導加熱コイル４とカムシャフト１との配置関係は、図２（ｂ）及び図１（ａ）に示す如くである。   As the camshaft 1 used in this embodiment, the one shown in FIGS. 2A and 2B is adopted, and the shape of the cam portion 3 and the interval (pitch) W between the cam portions 3 and 3 adjacent to each other. In addition, the interval L between the first to fourth cam portions is the same, and has the dimensions shown in the figure. Further, the arrangement relationship between the single high-frequency induction heating coil 4 and the camshaft 1 at the start of the induction hardening process is as shown in FIGS. 2B and 1A.

図１（ａ）〜（ｅ）は、本発明の一実施形態に係る高周波焼入方法を施行する際の単一の高周波誘導加熱コイル４とカムシャフト１との対応状態を経時的に示すものである。なお、本実施形態の高周波焼入方法は、従来のコイル移動方式及びワーク移動方式の双方を組み合わせたものであって、コイル・ワーク両移動方式と仮称されるものである。   1 (a) to 1 (e) show the corresponding state of a single high-frequency induction heating coil 4 and a camshaft 1 over time when performing an induction hardening method according to an embodiment of the present invention. It is. The induction hardening method of this embodiment is a combination of both the conventional coil moving method and the workpiece moving method, and is tentatively called the coil / work both moving method.

このコイル・ワーク両移動方式を施行する場合、単一の高周波誘導加熱コイル４とカムシャフト１とは、既述の如く図１（ａ）に示すような対応位置にある（高周波誘導加熱コイル４は初期位置Ｐ０にある）。次に、単一の高周波誘導加熱コイル４とカムシャフト１とがカムシャフト１のジャーナル部２の軸線αに沿って互いに逆方向に同一の移動速度（往路では３０ｍｍ／秒 ，復路では７０ｍｍ／秒）で移動する。具体的には、単一の高周波誘導加熱コイル４が図１において右方に移動する一方、カムシャフト１は図１において左方に移動する。図１（ｂ）は、第１番目のカム部３，３における単一の高周波誘導加熱コイル４とカム部３，３との対応位置を示しており、両者は相対向する位置Ｐ１にくる（高周波誘導加熱コイル４は位置Ｐ１にある）。以下、図１（ｃ），（ｄ）に示すように第２番目及び第３番目のカム部３，３の位置決め及びこれらの位置Ｐ２，Ｐ３における焼入処理が行われ、最後に図１（ｅ）に示す位置Ｐ４において第４番目のカム部３，３の焼入処理が行われる。   In the case of implementing this coil / workpiece movement system, the single high-frequency induction heating coil 4 and the camshaft 1 are in the corresponding positions as shown in FIG. Is at the initial position P0). Next, the single high-frequency induction heating coil 4 and the camshaft 1 have the same moving speed in the opposite directions along the axis α of the journal portion 2 of the camshaft 1 (30 mm / sec for the forward path and 70 mm / sec for the return path). ) To move. Specifically, the single high-frequency induction heating coil 4 moves to the right in FIG. 1, while the camshaft 1 moves to the left in FIG. FIG.1 (b) has shown the corresponding position of the single high frequency induction heating coil 4 and the cam parts 3 and 3 in the 1st cam parts 3 and 3, and both come to the position P1 which mutually opposes ( The high frequency induction heating coil 4 is at position P1). Thereafter, as shown in FIGS. 1C and 1D, the positioning of the second and third cam portions 3 and 3 and the quenching process at these positions P2 and P3 are performed. Finally, FIG. The quenching process of the fourth cam portions 3 and 3 is performed at a position P4 shown in e).

このようにして高周波焼入が終了した後に、単一の高周波誘導加熱コイル４及びカムシャフト１は、カムシャフト１の軸線α方向に沿って互いに逆方向に移動速度７０ｍｍ／秒で移動する。具体的には、単一の高周波誘導加熱コイル４が図１において左方に移動する一方、カムシャフト１は図１において右方に移動し、これらは元の図１（ａ）の状態に復帰する。   After the induction hardening is thus completed, the single induction heating coil 4 and the camshaft 1 move in the opposite directions along the axis α direction of the camshaft 1 at a moving speed of 70 mm / second. Specifically, the single high-frequency induction heating coil 4 moves to the left in FIG. 1, while the camshaft 1 moves to the right in FIG. 1, and these return to the original state of FIG. To do.

以上に述べたようなコイル・ワーク両移動方式の場合には、図１に示すように、単一の高周波誘導加熱コイル４及びカムシャフト１の移動距離はそれぞれ２１０ｍｍであり、移動時間は往路で２１０／３０＝７秒であり、復路は２１０／７０＝３秒であり、全移動時間（移動所要時間）は７＋３＝１０秒となる。一方、本発明のコイル・ワーク両移動方式においてもカム部３の焼入冷却時間は従来の場合と同一であり、３６秒がかかる。従って、焼入処理に要する全作業時間としては３６＋１０＝４６秒となり、従来のコイル移動方式やワーク移動方式の場合の５６秒に較べて１８％も時間短縮ができることとなり、その分だけ作業効率の向上を図ることができる。   In the case of the coil / workpiece moving system as described above, as shown in FIG. 1, the moving distance of the single high-frequency induction heating coil 4 and the camshaft 1 is 210 mm, and the moving time is the forward path. 210/30 = 7 seconds, the return path is 210/70 = 3 seconds, and the total movement time (time required for movement) is 7 + 3 = 10 seconds. On the other hand, also in the coil / workpiece moving system of the present invention, the quenching and cooling time of the cam portion 3 is the same as in the conventional case, which takes 36 seconds. Therefore, the total work time required for the quenching process is 36 + 10 = 46 seconds, which means that the time can be reduced by 18% compared to 56 seconds in the case of the conventional coil movement method and work movement method, and the work efficiency is increased by that amount. Improvements can be made.

また、単一の高周波誘導加熱コイル４及びカムシャフト１の移動に必要な移動スペースは６１０ｍｍであり、コイル移動方式の場合の４８０ｍｍよりも長いが、ワーク移動方式の場合の８２０ｍｍに較べて短い。従って、ワーク移動方式の場合に較べて省スペース化を図ることができる。   The moving space required for moving the single high-frequency induction heating coil 4 and the camshaft 1 is 610 mm, which is longer than 480 mm in the coil moving method, but shorter than 820 mm in the workpiece moving method. Therefore, space saving can be achieved as compared with the case of the work movement method.

以上、本発明の一実施形態について述べたが、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エンジンのカムシャフト（焼入対象物としてのワーク）のカム部を焼入対象部として本発明の高周波焼入方法を説明したが、焼入対象物（ワーク）としてはカムシャフトに限定されるものではなく、種々の形状及び寸法の焼入対象物についても本発明を適用することが可能である。なお、この場合、単一の高周波誘導加熱コイルや焼入対象物の移動速度を焼入対象物の形状及び寸法に応じて変化させるためのコントロールが必要になり、その分だけ方法の施行がやや複雑となるが、公知技術により容易に対応することが可能である。   Although one embodiment of the present invention has 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, the induction hardening method of the present invention has been described with the cam portion of the engine camshaft (work as a quenching object) as the quenching target part. However, the quenching object (work) However, the present invention is not limited to the camshaft, and the present invention can be applied to a quenching object having various shapes and dimensions. In this case, it is necessary to control a single high-frequency induction heating coil and the moving speed of the object to be hardened according to the shape and dimensions of the object to be hardened, and the method is slightly enforced accordingly. Although it is complicated, it can be easily handled by a known technique.

本発明の一実施形態に係る高周波焼入方法を説明するための説明図であって、図１（ａ）〜（ｅ）は本発明の一実施形態に係る高周波焼入方法を施行する際の単一の高周波誘導加熱コイルとカムシャフトとの対応関係を経時的に示す説明図である。It is explanatory drawing for demonstrating the induction hardening method which concerns on one Embodiment of this invention, Comprising: Fig.1 (a)-(e) is at the time of enforcing the induction hardening method which concerns on one Embodiment of this invention. It is explanatory drawing which shows the corresponding relationship of a single high frequency induction heating coil and a camshaft with time. 図２（ａ）は焼入対象物であるカムシャフト（ワーク）の平面図、図２（ｂ）は単一の高周波誘導加熱コイルとカムシャフトとの対応関係を概略的に示す説明図である。FIG. 2A is a plan view of a camshaft (work) that is an object to be hardened, and FIG. 2B is an explanatory view schematically showing a correspondence relationship between a single high-frequency induction heating coil and the camshaft. . 従来のコイル移動方式の高周波焼入方法を説明するための説明図であって、図３（ａ）〜（ｅ）は従来のコイル移動方式の高周波焼入方法を施行する際の単一の高周波誘導加熱コイルとカムシャフトとの対応関係を経時的に示す説明図である。It is explanatory drawing for demonstrating the conventional coil moving type induction hardening method, Comprising: Fig.3 (a)-(e) is a single high frequency at the time of enforcing the conventional coil moving type induction hardening method. It is explanatory drawing which shows the correspondence of an induction heating coil and a camshaft with time. 従来のワーク移動方式の高周波焼入方法を説明するための説明図であって、図４（ａ）〜（ｅ）は従来のワーク移動方式の高周波焼入方法を施行する際の単一の高周波誘導加熱コイルとカムシャフトとの対応関係を経時的に示す説明図である。It is explanatory drawing for demonstrating the induction hardening method of the conventional workpiece movement system, Comprising: Fig.4 (a)-(e) is a single high frequency at the time of enforcing the induction hardening method of the conventional workpiece movement method It is explanatory drawing which shows the correspondence of an induction heating coil and a camshaft with time.

符号の説明Explanation of symbols

１ カムシャフト
２ ジャーナル部（シャフト部）
３ カム部
３ａ 外周面（カム面）
４ 単一の高周波誘導加熱コイル 1 Camshaft 2 Journal (shaft)
3 Cam part 3a Outer peripheral surface (cam surface)
4 Single high frequency induction heating coil

Claims (2)

単一の高周波誘導加熱コイルと焼入対象物とを相対的に移動させて前記焼入対象物の複数箇所の焼入対象部を高周波誘導加熱した後に冷却することにより、前記複数箇所の焼入対象部のそれぞれを順次に焼入処理するようにした高周波焼入方法において、前記単一の高周波誘導加熱コイル及び前記焼入対象物を互いに逆方向に同時に移動させて前記複数箇所の焼入対象部を順次に焼入処理することを特徴とする高周波焼入方法。   The multiple induction hardening coils are cooled by high-frequency induction heating of a plurality of quenching target portions of the quenching object by relatively moving a single induction heating coil and the quenching object. In the induction hardening method in which each of the target portions is sequentially quenched, the single induction induction heating coil and the quenching object are simultaneously moved in opposite directions to the quenching objects at the plurality of locations. Induction hardening method characterized by sequentially quenching the parts. 前記焼入対象物がエンジンのカムシャフトであり、前記焼入対象部が前記カムシャフトのカム部であり、前記単一の高周波誘導加熱コイル及び前記焼入対象物の移動方向は、前記カムシャフトのジャーナル部の軸線に沿う方向であることを特徴とする請求項１に記載の高周波焼入方法。   The object to be hardened is a camshaft of an engine, the part to be hardened is a cam part of the camshaft, and the moving direction of the single high frequency induction heating coil and the object to be hardened is the camshaft. The induction hardening method according to claim 1, wherein the direction is along the axis of the journal portion.
JP2004168039A 2004-06-07 2004-06-07 High frequency-induction hardening method Pending JP2005344193A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63262416A (en) * 1987-04-18 1988-10-28 Dai Ichi High Frequency Co Ltd Continuous quenching method
JPH0647350U (en) * 1992-11-30 1994-06-28 いすゞ自動車株式会社 Induction hardening equipment
JP2002003934A (en) * 2000-06-14 2002-01-09 High Frequency Heattreat Co Ltd Hardening method and hardening apparatus
JP2002097522A (en) * 2000-09-22 2002-04-02 Denki Kogyo Co Ltd Method for induction hardening of cam shaft with low strain by high frequency and its appararus
JP2002167620A (en) * 2000-11-28 2002-06-11 Denki Kogyo Co Ltd Induction hardening method of cam shaft, and apparatus therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63262416A (en) * 1987-04-18 1988-10-28 Dai Ichi High Frequency Co Ltd Continuous quenching method
JPH0647350U (en) * 1992-11-30 1994-06-28 いすゞ自動車株式会社 Induction hardening equipment
JP2002003934A (en) * 2000-06-14 2002-01-09 High Frequency Heattreat Co Ltd Hardening method and hardening apparatus
JP2002097522A (en) * 2000-09-22 2002-04-02 Denki Kogyo Co Ltd Method for induction hardening of cam shaft with low strain by high frequency and its appararus
JP2002167620A (en) * 2000-11-28 2002-06-11 Denki Kogyo Co Ltd Induction hardening method of cam shaft, and apparatus therefor

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