JP5694001B2 - Induction hardening coil and quenching method using the same - Google Patents
Induction hardening coil and quenching method using the same Download PDFInfo
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- JP5694001B2 JP5694001B2 JP2011042319A JP2011042319A JP5694001B2 JP 5694001 B2 JP5694001 B2 JP 5694001B2 JP 2011042319 A JP2011042319 A JP 2011042319A JP 2011042319 A JP2011042319 A JP 2011042319A JP 5694001 B2 JP5694001 B2 JP 5694001B2
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Description
本発明は、ピン穴部を高周波焼入れするための高周波焼入れ用コイル及びそれを用いた焼入れ方法に関する。 The present invention relates to an induction hardening coil for induction hardening of pin holes and a hardening method using the same.
従来、ピン穴部を高周波焼入れするためには、ピン穴部の内径に合った外径の専用コイルを用いている。また、特許文献１には、被加熱物の内周面を効率よく高周波焼入れするために、被加熱物の内周面に対向して加熱コイルを配置し、この加熱コイルに通電することにより、被加熱物の内周面を高周波焼入れする内周面高周波焼入れ用加熱コイルにおいて、加熱コイルが、内周から外周に向かうほど、電気伝導率が高い材料で構成されている技術が開示されている。 Conventionally, in order to induction-harden the pin hole portion, a dedicated coil having an outer diameter matching the inner diameter of the pin hole portion is used. Further, in Patent Document 1, in order to efficiently induction-harden the inner peripheral surface of the object to be heated, a heating coil is disposed opposite to the inner peripheral surface of the object to be heated, and by energizing the heating coil, In a heating coil for inner peripheral surface induction hardening for induction hardening of the inner peripheral surface of an object to be heated, a technique is disclosed in which the heating coil is made of a material having higher electrical conductivity from the inner periphery toward the outer periphery. .
しかし、ピン穴部の内径に合った外径の専用コイルを用いると、焼入れの対象となる機種毎に専用コイルを用意しなければならず、少量多機種生産が加速している生産ラインにおけるコイルの汎用化の要請に答えることができない。また、特許文献１に記載された技術でも、少量多機種生産が加速している生産ラインに対し、多機種のピン穴部に対応できる加熱コイルを提供することができない。 However, if a special coil with an outer diameter that matches the inner diameter of the pin hole is used, a special coil must be prepared for each model subject to quenching. Cannot answer the request for generalization. Further, even with the technique described in Patent Document 1, it is not possible to provide a heating coil that can handle multiple types of pin hole portions on a production line in which a small amount of multiple types of production is accelerating.
本発明は、従来の技術が有するこのような問題点に鑑みてなされたものであり、その目的とするところは、多機種のピン穴部の高周波焼入れに対応することができる高周波焼入れ用コイル及びそれを用いた焼入れ方法を提供しようとするものである。 The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide an induction hardening coil that can cope with induction hardening of many types of pin holes, and It is intended to provide a quenching method using the same.
上記課題を解決すべく請求項１に係る発明は、ピン穴部を高周波焼入れするための高周波焼入れ用コイルであって、コイル部材と、このコイル部材の凹部に取り付けたコアからなる２つの略半円柱形状のコイルを対向させると共に、前記略半円柱形状のコイルの中央で前記コアがオーバーラップしているものである。 In order to solve the above-mentioned problems, the invention according to claim 1 is an induction hardening coil for induction hardening of a pin hole, and comprises two substantially half parts comprising a coil member and a core attached to a recess of the coil member. While the cylindrical coils are opposed to each other, the core is overlapped at the center of the substantially semi-cylindrical coil.
また、前記２つの略半円柱形状のコイルが対向する距離は、任意に設定することができる。 The distance between the two substantially semi-cylindrical coils can be arbitrarily set.
請求項３に係る発明は、請求項２に記載の高周波焼入れ用コイルを用いてピン穴部を高周波焼入れする焼入れ方法であって、ピン穴部の内径に応じて２つの略半円柱形状のコイルが対向する距離を設定し、この距離に設定された高周波焼入れ用コイルをピン穴部に挿入して高周波焼入れをするものである。
The invention according to
請求項１に係る発明によれば、略半円柱形状のコイルの中央でコアがオーバーラップして取り付けてあるので、焼入れ深さの均一化が図れる。 According to the first aspect of the present invention, since the cores are overlapped and attached at the center of the substantially semi-cylindrical coil, the quenching depth can be made uniform.
また、２つの略半円柱形状のコイルが対向する距離をピン穴部の内径に合わせて設定すれば、多機種のピン穴部に対応することができ、高周波焼入れ用コイルの汎用化が図れる。 Further, if the distance between the two substantially semi-cylindrical coils facing each other is set in accordance with the inner diameter of the pin hole portion, it can be used for various types of pin hole portions, and the induction hardening coil can be generalized.
請求項３に係る発明によれば、２つの略半円柱形状のコイルが対向する距離をピン穴部の内径に合わせて設定することができるので、一つの高周波焼入れ用コイルで多機種のピン穴部に対応した高周波焼入れを行うことができる。 According to the third aspect of the invention, since the distance between the two substantially semi-cylindrical coils can be set according to the inner diameter of the pin hole portion, a single induction hardening coil can be used for many types of pin holes. Induction hardening corresponding to the part can be performed.
以下に本発明の実施の形態を添付図面に基づいて説明する。本発明に係る高周波焼入れ用コイル１は、図１に示すように、２つの略半円柱形状のコイル２，３を点対称になるよう対向させて配置している。各コイル２，３は、コイル部材４とコア５からなり、コイル部材４に設けた凹部４ａに円柱の略四分の一の形状に形成されたコア５が取り付けられている。
Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the induction hardening coil 1 according to the present invention has two substantially
また、高周波焼入れ用コイル１は、コイル２とコイル３に分割されているが、コイル２，３個々に電源を持たない。コイル２，３には、従来のコイルと同様に一系統の電源（不図示）により電力が供給される。
The induction hardening coil 1 is divided into a
更に、高周波焼入れ用コイル１では、図１（ｂ）に示すように、一方のコイル２のコア５と他方のコイル３のコア５が、中央で長さＡだけオーバーラップしている。このように、オーバーラップ長さＡを設けてコア５をコイル部材４に取り付けることにより、焼き入れ効果が増加し焼入れ深さが均一化される。
Further, in the induction hardening coil 1, as shown in FIG. 1B, the
また、２つの略半円柱形状のコイル２，３が対向する距離Ｄは、図２に示すように、高周波焼入れの対象となるワークＷのピン穴部Ｗａの内径Ｂの大きさに対応するため、所定範囲で任意に設定することができる。図１は、距離Ｄが最小の状態を示し、高周波焼入れ用コイル１は略円柱形状を形成している。このように、高周波焼入れ用コイル１の距離Ｄを所定範囲で可変自在にすることにより、所望の熱効率を維持して多機種のピン穴部Ｗａに対応することができる。
Further, as shown in FIG. 2, the distance D between the two substantially
高周波焼入れ用コイル１は、図３に示すように、袋穴仕様の治具７にセットされたワークＷのピン穴部Ｗａに挿入される。治具７を袋穴仕様にして、冷却水８を治具７の底部７ａに当てることにより、冷却水８を有効活用してピン穴部Ｗａの中央部の冷却効果を高め、硬化層深さを促進させることができる。更に、硬化層深さを安定させるために、補助冷却ジャケット（不図示）をピン穴部Ｗａに設けることもできる。
As shown in FIG. 3, the induction hardening coil 1 is inserted into a pin hole portion Wa of a workpiece W set in a jig 7 having a bag hole specification. By using the jig 7 as a bag hole specification and applying the cooling water 8 to the
そして、冷却水８を流しながら発振器（不図示）がコイル１に所定周波数の電流を所定時間流すことにより、ピン穴部Ｗａの内周面Ｗｂに対して高周波焼入れを行うことができる。この時、ワークＷを所定の回転数で回転させる。 Then, an induction hardening can be performed on the inner peripheral surface Wb of the pin hole Wa by causing an oscillator (not shown) to flow a current of a predetermined frequency through the coil 1 for a predetermined time while flowing the cooling water 8. At this time, the workpiece W is rotated at a predetermined rotational speed.
以上のように構成された本発明に係る高周波焼入れ用コイル１を用いた焼入れ方法について説明する。先ず、図３に示すように、冷却効果の安定化を図るためワークＷを袋穴仕様の治具８にセットする。 A quenching method using the induction hardening coil 1 according to the present invention configured as described above will be described. First, as shown in FIG. 3, in order to stabilize the cooling effect, the workpiece W is set in a jig 8 having a bag hole specification.
次いで、図４に示すように、高周波焼入れ用コイル１が対応することができるワークＷのピン穴部Ｗａの内径Ｂの大きさに応じて、コイル２，３が対向する距離Ｄが、コイルクリアランスＣを考慮して設定される。
Next, as shown in FIG. 4, according to the size of the inner diameter B of the pin hole portion Wa of the work W that can be accommodated by the induction hardening coil 1, the distance D where the
ここで、図４（ａ）はピン穴部Ｗａの内径Ｂが最も小さい場合、図４（ｂ）はピン穴部Ｗａの内径Ｂが中位の場合、図４（ｃ）はピン穴部Ｗａの内径Ｂが最も大きい場合を示している。図４（ａ）に示す状態の場合が最も熱効率がよいが、図４（ｃ）に示す状態の場合でも所望な熱効率が得られる。 4A shows the case where the inner diameter B of the pin hole portion Wa is the smallest, FIG. 4B shows the case where the inner diameter B of the pin hole portion Wa is middle, and FIG. 4C shows the pin hole portion Wa. This shows the case where the inner diameter B is the largest. Although the thermal efficiency is best in the state shown in FIG. 4A, the desired thermal efficiency can be obtained even in the state shown in FIG.
次いで、所定の条件（発振器の周波数と出力、電圧と加熱時間、ワーク回転数、冷却水の流量など）の下で、ピン穴部Ｗａの内周面Ｗｂに対して高周波焼入れが行われる。高周波焼入れ用コイル１では、コイル２，３の中央でオーバーラップ長さＡを設けてコア５，５がコイル部材４，４に取り付けてあるので、焼入れ深さが均一化される。
Next, induction hardening is performed on the inner peripheral surface Wb of the pin hole Wa under predetermined conditions (oscillator frequency and output, voltage and heating time, work rotation speed, cooling water flow rate, etc.). In the induction hardening coil 1, since the overlap length A is provided at the center of the
本発明によれば、焼入れ深さの均一化が図れると共に、多機種のピン穴部に対応することができる汎用の高周波焼入れ用コイル及びそれを用いた焼入れ方法を提供することができる。 According to the present invention, it is possible to provide a general-purpose induction hardening coil that can make the quenching depth uniform and can cope with various types of pin hole portions and a quenching method using the same.
１…高周波焼入れ用コイル、２，３…略半円柱形状のコイル、４…コイル部材、４ａ…凹部、５…コア、７…治具、８…冷却水、Ａ…オーバーラップ長さ、Ｂ…内径、Ｃ…コイルクリアランス、Ｄ…距離、Ｗ…ワーク、Ｗａ…ピン穴部、Ｗｂ…内周面。 DESCRIPTION OF SYMBOLS 1 ... Coil for induction hardening, 2, 3 ... Coil of substantially semi-cylindrical shape, 4 ... Coil member, 4a ... Recessed part, 5 ... Core, 7 ... Jig, 8 ... Cooling water, A ... Overlap length, B ... Inner diameter, C ... Coil clearance, D ... Distance, W ... Workpiece, Wa ... Pin hole, Wb ... Inner circumferential surface.
Claims (3)
A quenching method in which a pin hole is induction hardened using the induction hardening coil according to claim 2, wherein a distance between two substantially semi-cylindrical coils is set in accordance with an inner diameter of the pin hole, A quenching method, wherein induction hardening is performed by inserting an induction hardening coil set to this distance into a pin hole.
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| JP2011042319A JP5694001B2 (en) | 2011-02-28 | 2011-02-28 | Induction hardening coil and quenching method using the same |
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| JPS5873721A (en) * | 1981-10-28 | 1983-05-04 | High Frequency Heattreat Co Ltd | Longitudinal stripelike surface quenching method of small diameter hole wall and its device |
| JP4187635B2 (en) * | 2003-12-10 | 2008-11-26 | 株式会社ミヤデン | High frequency induction heating coil |
| JP2009122692A (en) * | 2009-02-02 | 2009-06-04 | Toshiba Corp | Fixing device |
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