JP4826291B2 - Induction hardening apparatus and induction hardening method - Google Patents

Induction hardening apparatus and induction hardening method Download PDF

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JP4826291B2
JP4826291B2 JP2006061438A JP2006061438A JP4826291B2 JP 4826291 B2 JP4826291 B2 JP 4826291B2 JP 2006061438 A JP2006061438 A JP 2006061438A JP 2006061438 A JP2006061438 A JP 2006061438A JP 4826291 B2 JP4826291 B2 JP 4826291B2
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positioning
workpiece
quenching
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induction hardening
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JP2006318889A (en
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泰彦 佐伯
陽一 村上
悟 守屋
雅宏 吉川
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Nissan Motor Co Ltd
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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
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    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
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Description

本発明は、電磁誘導加熱により被処理物を高周波焼入れする際の焼入れ範囲を特定する高周波焼入れ装置および高周波焼入れ方法に関するものである。   The present invention relates to an induction hardening apparatus and an induction hardening method for specifying a hardening range when an object to be processed is induction-quenched by electromagnetic induction heating.

従来から電磁誘導加熱により被処理物を高周波焼入れする際の焼入れ範囲を特定するために磁束遮蔽部材を利用する焼入れ方法が提案されている(特許文献1、2参照)。   Conventionally, a quenching method using a magnetic flux shielding member has been proposed in order to specify a quenching range when a workpiece is induction-hardened by electromagnetic induction heating (see Patent Documents 1 and 2).

特許文献1では、軸径が変化する軸物の高周波焼入れにおいて、焼入れコイル内径より小さい内径を持ったフェライトコア、又は珪素鋼板等の磁束遮蔽部材で、焼入れコイルの少なくとも上下面を被覆し、磁束が焼入れコイルとほぼ等しい範囲で、被処理物に当たるようにした移動焼入用コイルが提案されている。   In Patent Document 1, in induction hardening of a shaft object whose shaft diameter changes, a ferrite core having an inner diameter smaller than the quenched coil inner diameter or a magnetic flux shielding member such as a silicon steel plate covers at least the upper and lower surfaces of the quenched coil, and the magnetic flux 2. Description of the Related Art A moving quenching coil has been proposed that hits an object to be processed within a range almost equal to a quenching coil.

特許文献2では、特許文献1の被処理物セット位置ずれを解決するために、焼入れコイルを被処理物に接触させ、且つ接触部位のセラミック板を適当な厚さにすることによって、コイルと被処理物との間のクリアランスを一定に保つようにして、安定した焼入れ品質を確保するようにしている。
実開昭59−83963号公報 実開昭62−203255号公報
In Patent Document 2, in order to solve the misalignment of the workpiece set in Patent Document 1, the quenching coil is brought into contact with the workpiece, and the ceramic plate at the contact portion is made to have an appropriate thickness, whereby the coil and the workpiece are placed. A constant quenching quality is ensured by maintaining a constant clearance between the workpieces.
Japanese Utility Model Publication No.59-83963 Japanese Utility Model Publication No. 62-203255

しかしながら、上記従来例では、電磁誘導コイルに遮蔽板を取付けて被処理物の焼入れ範囲を調整するものであるため、被処理物の焼入れ範囲の厳密な調整が難しい課題があった。   However, in the above conventional example, since a shielding plate is attached to the electromagnetic induction coil to adjust the quenching range of the workpiece, there is a problem that it is difficult to strictly adjust the quenching range of the workpiece.

そこで本発明は、上記問題点に鑑みてなされたもので、被処理物の焼入れ範囲の厳密な調整に好適な高周波焼入れ装置および高周波焼入れ方法を提供することを目的とする。   Then, this invention was made | formed in view of the said problem, and it aims at providing the induction hardening apparatus and induction hardening method suitable for the strict adjustment of the hardening range of a to-be-processed object.

本発明は、非焼入れ部である端部を両端に備えると共に両端部を焼入部である連結部により一体に連結してなるワークに対する高周波焼入れ装置であり、ワークの両端部を夫々保持・位置決めする複数の位置決め治具と、ワークの連結部を高周波電流により電磁誘導加熱する焼入れコイルとを備える高周波焼入れ装置において、前記複数の位置決め治具は、ワークの一端部を包囲・係合してワークを保持する一端部位置決め治具と、前記一端部位置決め治具により保持されたワークの他端部の延長上の待機位置から他端部に向かって接近離脱可能であり、他端部に係合する作動位置において他端部をその外形側から保持して他端部を位置決めする他端部位置決め治具と、他端部位置決め治具により位置決めされた他端部の他端部位置決め治具により覆われていない開放部位と対面する待機位置から他端部の開放部位に接近離脱可能であり、他端部の開放部位と係合する作動位置において他端部の開放部位を覆って焼き入れコイルから発せられる磁束の他端部への侵入を遮蔽した状態で他端部を位置決めする他端部開放部位位置決め治具と、から構成され、前記焼入コイルは、前記他端部位置決め治具にその基部が固定され、他端部位置決め治具の先端側の延長部分を、ワークにおける連結部の長さ寸法分において取囲んでコイル状に配置されており、前記一端部位置決め治具により保持されたワークに対して他端部位置決め治具の待機位置から作動位置への作動により焼入コイルをワークの連結部を取囲む位置にセットされ、その後の他端部開放部位位置決め治具の待機位置から作動位置への作動後に高周波電流により連結部を電磁誘導加熱するようにした。 The present invention is an induction hardening apparatus for a workpiece which is provided with end portions which are non-quenched portions at both ends, and which are integrally connected by connecting portions which are both hardened portions, and holds and positions both end portions of the workpiece. In the induction hardening apparatus including a plurality of positioning jigs and a quenching coil that electromagnetically heats a connection portion of the workpieces by high-frequency current, the plurality of positioning jigs surround and engage one end of the workpiece to One end positioning jig to be held, and can be approached and detached from the standby position on the extension of the other end of the work held by the one end positioning jig toward the other end, and engage with the other end. The other end positioning jig for positioning the other end while holding the other end from the outer shape side in the operating position, and the other end positioning jig for the other end positioned by the other end positioning jig It is possible to approach and leave the open part of the other end from the standby position facing the open part that is not covered more, and harden it by covering the open part of the other end in the operating position that engages the open part of the other end. The other end portion open position positioning jig for positioning the other end portion in a state where the intrusion of the magnetic flux generated from the coil to the other end portion is shielded, and the quenching coil is configured to be the other end portion positioning jig. The base portion is fixed to the other end, and the extension portion on the front end side of the other end portion positioning jig is surrounded by the length of the connecting portion of the workpiece and arranged in a coil shape, and is held by the one end portion positioning jig. The hardened coil is set to a position surrounding the connecting portion of the workpiece by the operation from the standby position of the other end positioning jig to the operating position with respect to the finished workpiece, and then the other end open portion positioning jig is standby. From position The connecting portion is adapted to an electromagnetic induction heating by the high-frequency current after actuation of the position.

したがって、本発明では、焼入コイルは、ワークを端面方向から位置決め保持する他端位置決め治具に取付けられ、他端位置決め治具によるワークの位置決め保持状態において、ワークの焼入れ部の周囲に位置決めされるため、ワークとコイルとの相対位置精度を向上でき、精密な焼入範囲の調整を可能となる。
また、磁束の非焼入れ部への侵入を遮蔽する他端部開放部位位置決め治具は、前記焼入れコイルがワークの焼入れ部の周囲に位置決めされた状態において、非焼入れ部を位置決め保持するため、焼入れコイルとの干渉などを考慮せずに配置することができる。
結果として、非焼入れ部の磁束遮蔽精度を向上させることによるワークの精密な焼入範囲の調整を可能とし、且つワークの位置精度向上による焼入精度の向上が可能となる。
Therefore, in the present invention, the quenching coil is attached to the other end positioning jig that positions and holds the workpiece from the end surface direction, and is positioned around the quenched portion of the workpiece in the positioning and holding state of the workpiece by the other end positioning jig. Therefore, the relative positional accuracy between the workpiece and the coil can be improved, and the precise quenching range can be adjusted.
Also, the other end open portion positioning jig that shields the penetration of magnetic flux into the non-quenched part is hardened in order to position and hold the non-quenched part in a state where the quenched coil is positioned around the hardened part of the workpiece. Arrangement can be made without considering interference with the coil.
As a result, it is possible to adjust the work quenching range precisely by improving the magnetic flux shielding accuracy of the non-quenched portion, and it is possible to improve the work hardening accuracy by improving the work position accuracy.

以下、本発明のタイトルを各実施形態に基づいて説明する。   Hereinafter, the title of the present invention will be described based on each embodiment.

(第1実施形態)
図1〜図8は、本発明の第1実施形態における高周波焼入れ装置および高周波焼入れ方法を示し、図1は高周波焼入れ装置の正面図および側面図、図2〜図8は高周波焼入れ装置の作動状態を夫々示す正面図および側面図である。
(First embodiment)
1 to 8 show an induction hardening apparatus and an induction hardening method in the first embodiment of the present invention, FIG. 1 is a front view and a side view of the induction hardening apparatus, and FIGS. 2 to 8 are operating states of the induction hardening apparatus. It is the front view and side view which respectively show.

図1に示す高周波焼入れ装置は、内燃機関のコンロッドを対象とする高周波焼入れ装置に本発明を適用したものであるが、これは本発明の一実施例を示すものであり、コンロッド以外のワークの高周波焼入装置にも適用できることは勿論である。   The induction hardening apparatus shown in FIG. 1 is one in which the present invention is applied to an induction hardening apparatus for a connecting rod of an internal combustion engine. However, this shows one embodiment of the present invention, and a work piece other than the connecting rod is used. Of course, the present invention can also be applied to an induction hardening apparatus.

先ず、対象とするワークであるコンロッドについて説明する。一般に知られているように、内燃機関のコンロッドWは、ピストンピンを介してピストンを軸受支持する小端部W1と、クランクシャフトのクランクピンに軸受メタルを介して取付けられる大端部W2と、前記小端部W1と大端部W2とを連結するロッド部W3とを備える。小端部W1はピストンピンをブッシュを介して軸受け支持する軸穴の穴加工、スラスト面W1Sの加工および軸穴に潤滑油を供給するための油穴加工が施される。また、大端部W2においても、軸受メタルを支持する穴加工とスラスト面W2Sの加工と軸受メタルへの潤滑油を供給する油穴加工とコンロッドボルトを挿通するボルト穴加工等の機械加工が施される。   First, the connecting rod which is a target work will be described. As is generally known, a connecting rod W of an internal combustion engine includes a small end W1 that supports a piston via a piston pin, a large end W2 that is attached to a crankpin of a crankshaft via a bearing metal, A rod portion W3 that connects the small end portion W1 and the large end portion W2 is provided. The small end portion W1 is subjected to drilling of a shaft hole for supporting the piston pin through a bush, processing of the thrust surface W1S, and oil hole processing for supplying lubricating oil to the shaft hole. The large end W2 is also subjected to machining such as drilling for supporting the bearing metal, machining of the thrust surface W2S, machining of the oil hole for supplying lubricating oil to the bearing metal, and bolting of the connecting rod bolt. Is done.

従って、鋳造若しくは鍛造で製作されたコンロッドWの中間製品に高周波誘導電流によって、ワークWの表面を急熱急冷して硬化させる高周波焼入れを施して靭性や耐摩耗性を高める場合には、これら機械加工が施される軸受部位等は硬化させることなく素材の持つ靱性を維持するよう非焼入れ部とし、専らロッド部W3に正確に焼入れする必要がある。   Therefore, if the intermediate product of the connecting rod W manufactured by casting or forging is subjected to induction hardening in which the surface of the workpiece W is rapidly quenched and hardened by high frequency induced current to enhance toughness and wear resistance, these machines are used. It is necessary to make the bearing part or the like to be processed a non-quenched part so as to maintain the toughness of the material without hardening, and to exclusively harden the rod part W3 exclusively.

図1に示すように、本実施形態の高周波焼入れ装置1は、ワークであるコンロッドWを位置決め保持するために、大端部W2を概略位置決めする大端部ホルダ2と、大端部W2を保持し位置決めする大端部中心軸位置決め治具3と、小端部W1を保持し位置決めする小端部位置決め治具4および小端部スラスト面W1Sを保持すると共に小端部スラスト面W1Sへの磁束遮蔽機能を備える小端部スラスト位置決め治具5と、を備え、さらに、ワークWを取囲んで高周波磁束を発生させる焼入れコイル6を備える。   As shown in FIG. 1, the induction hardening apparatus 1 of the present embodiment holds a large end holder 2 for roughly positioning the large end W2 and a large end W2 in order to position and hold the connecting rod W as a workpiece. The large end central axis positioning jig 3 for positioning, the small end positioning jig 4 for holding and positioning the small end W1, and the small end thrust surface W1S and the magnetic flux to the small end thrust surface W1S A small-end thrust positioning jig 5 having a shielding function, and a quenching coil 6 that surrounds the workpiece W and generates a high-frequency magnetic flux.

前記大端部ホルダ2は、焼入れ装置1の下部フレーム11上に配置され、大端部スラスト面W2Sに対面する一対の壁面21と、この一対の壁面21同士を連結して大端部W2の側面を覆う対向した壁面22と大端部W2の合せ面が着座する底面23とを備え、これら壁面21、22により大端部W2を取囲むよう構成している。そして、これら壁面21、22の内面は、大端部W2が投入された際に、大端部W2を案内するように、入口部側が若干大きくなっており、底面23に合せ面が着座した段階で、底面23の寸法は大端部W2より縦横とも数ミリ分は大きく形成して、大端部W2が確実に着座するようにしている。大端部ホルダ2の底面23は、また、下方に開口する貫通穴24が形成され、この貫通穴24を通して、後述する中心軸位置決め治具3が下方から挿入される。   The large end holder 2 is disposed on the lower frame 11 of the quenching apparatus 1 and connects the pair of wall surfaces 21 facing the large end thrust surface W2S and the pair of wall surfaces 21 to each other. An opposing wall surface 22 covering the side surface and a bottom surface 23 on which a mating surface of the large end W2 is seated are configured to surround the large end W2 by these wall surfaces 21 and 22. The inner surfaces of these wall surfaces 21 and 22 are slightly larger at the inlet side so that the large end portion W2 is guided when the large end portion W2 is inserted, and the mating surface is seated on the bottom surface 23. Thus, the size of the bottom surface 23 is formed to be larger by several millimeters both vertically and horizontally than the large end portion W2, so that the large end portion W2 is securely seated. The bottom end 23 of the large end holder 2 is also formed with a through hole 24 that opens downward, and a center axis positioning jig 3 to be described later is inserted from below through the through hole 24.

前記大端部中心軸位置決め治具3は、焼入れ装置1の下部フレーム11内に配置され、前記大端部ホルダ2の底面23に設けた貫通穴24から大端部ホルダ2内に出没可能な位置決め部材31と、この位置決め部材31を大端部ホルダ2内に焼入れ開始時に進出させ、焼入れ完了時に大端部ホルダ2内から退避させるアクチュエータ32とを備える。前記位置決め部材31は、ワークWの大端部W2のメタル保持面に係合する形状とされ、大端部ホルダ2内への進出時にワークWの大端部W2に係合してワークWを上方に位置決めのために押圧してワークWの大端部W2側の中心位置出しを行う。   The large end center axis positioning jig 3 is disposed in the lower frame 11 of the quenching apparatus 1 and can protrude and retract into the large end holder 2 from a through hole 24 provided in the bottom surface 23 of the large end holder 2. A positioning member 31 and an actuator 32 that moves the positioning member 31 into the large end holder 2 at the start of quenching and retracts from the large end holder 2 when the quenching is completed. The positioning member 31 is configured to engage with the metal holding surface of the large end W2 of the workpiece W, and engages with the large end W2 of the workpiece W when the workpiece W is advanced into the large end holder 2. The center is positioned on the large end W2 side of the workpiece W by pressing upward for positioning.

前記小端部位置決め治具4は、焼入れ装置1の上部フレーム12に配置され、ワークWの小端部W1の上面の2箇所に係合して小端部W1を位置決めする下方に開いた「ハ字状」の形状を備える位置決め部材41と、この位置決め部材41をワークWの投入・搬出時に退避位置に上昇させ、焼入れ開始から完了まで下降させて作動位置に保持するアクチュエータ42とを備える。投入されたワークWは、焼入れ装置1内で、小端部W1を上方として、その大端部W2の合せ面により大端部ホルダ2の底面23に着座される。「ハ字状」の位置決め部材41は、ワークWの小端部W1の上面に臨んで、その傾斜した一対の斜面によりワークWが傾くのを防止する。次いで、中心軸位置決め治具3の位置決め部材31の係合によりワークWが上昇される際に、同じくその傾斜した一対の斜面をワークWの小端部W1の上面に接触させて、小端部W1の位置決めを行う。   The small end portion positioning jig 4 is disposed on the upper frame 12 of the quenching apparatus 1 and engages with two places on the upper surface of the small end portion W1 of the workpiece W and opens downward to position the small end portion W1. A positioning member 41 having a “C” shape and an actuator 42 that raises the positioning member 41 to the retracted position when the workpiece W is loaded and unloaded and lowers the workpiece W from the start to the end of the work W to hold it in the operating position. The charged workpiece W is seated on the bottom surface 23 of the large end holder 2 by the mating surface of the large end W2 with the small end W1 facing upward in the quenching apparatus 1. The “C” -shaped positioning member 41 faces the upper surface of the small end W1 of the workpiece W and prevents the workpiece W from being inclined by the inclined pair of inclined surfaces. Next, when the workpiece W is lifted by the engagement of the positioning member 31 of the center axis positioning jig 3, the pair of inclined surfaces are similarly brought into contact with the upper surface of the small end portion W1 of the workpiece W, and the small end portion Position W1.

前記小端部位置決め部材41には、ワークWを取囲んで高周波磁束を発生させる焼入れコイル6の基部が固定されており、焼入れコイル6は位置決め部材41から下方に向かって配置され、位置決め部材41の作動位置への下降により、位置決め部材41に先行してワークWを取囲み、ワークWの倒れ防止を図りつつ、焼入れしようとする部位回りに配置される。   A base portion of a quenching coil 6 that surrounds the workpiece W and generates high-frequency magnetic flux is fixed to the small end portion positioning member 41, and the quenching coil 6 is disposed downward from the positioning member 41. When the workpiece W is lowered to the operating position, the workpiece W is surrounded prior to the positioning member 41 and disposed around the portion to be quenched while preventing the workpiece W from falling.

前記小端部スラスト位置決め治具5は、焼入れ装置1の下方フレーム11から立設されたポスト13上に配置され、ワークWの小端部W1の両側のスラスト面W1Sに対向するよう一対の位置決め部材51が対向して配置される。そして、位置決め部材51の待機位置では、ワークW周りへの焼入れコイル6の作動位置への下降動作、および、ワークW周りからの焼入れコイル6の待機位置への上昇動作を許容するよう、ワークWの両スラスト面W1Sから大きく離間している。ワークWがセットされ且つ焼入れコイル6が作動位置にセットされた段階では、位置決め部材51は背面のアクチュエータ52により押出され、その位置決め部材51をワークWの小端部W1の両側のスラスト面W1Sに夫々着座させて小端部W1を挟み、スラスト方向の位置決めを行う作動位置となる。この作動位置では、位置決め部材51により小端部W1のスラスト面W1SのロッドW3側を覆うことで、隣接して配置される焼入れコイル6よりの磁束が小端部W1側に浸入するのを遮蔽する。   The small end thrust positioning jig 5 is disposed on a post 13 erected from the lower frame 11 of the quenching apparatus 1 and is positioned in a pair so as to face the thrust surfaces W1S on both sides of the small end W1 of the workpiece W. The member 51 is arrange | positioned facing. At the standby position of the positioning member 51, the workpiece W is allowed to be lowered to the operating position of the quenching coil 6 around the workpiece W and to be moved from the periphery of the workpiece W to the standby position. The two thrust surfaces W1S are largely separated from each other. At the stage where the workpiece W is set and the hardening coil 6 is set to the operating position, the positioning member 51 is pushed out by the actuator 52 on the back surface, and the positioning member 51 is placed on the thrust surfaces W1S on both sides of the small end portion W1 of the workpiece W. Each of them is seated and sandwiched between the small end portions W1 to be an operating position for positioning in the thrust direction. In this operating position, the positioning member 51 covers the rod W3 side of the thrust surface W1S of the small end W1 to shield the magnetic flux from the quenching coil 6 disposed adjacently from entering the small end W1. To do.

上記小端部スラスト位置決め部材51は、図示しないが、内部に冷却水を還流させる冷却装置を設けることができ、そのワークWへの当接面を介してワークWを冷却して、ワークWの温度上昇を抑制させるようにすることが望ましい。このように冷却装置を設けることで、ワークWに焼入れコイル6よりの磁束が流れても、焼入れ温度に達するまで温度上昇されることを防止することができ、精密な焼入れ範囲の設定が可能となる。また、位置決め部材51による遮蔽物のみでは焼入れコイル6よりの磁束を完全に遮蔽しきれない場合にも、小端部W1の温度上昇の抑制には有効である。   Although the small-end thrust positioning member 51 is not shown, a cooling device that recirculates the cooling water can be provided inside the small-end thrust positioning member 51, and the workpiece W is cooled through the contact surface with the workpiece W, It is desirable to suppress the temperature rise. By providing the cooling device in this way, even if magnetic flux from the quenching coil 6 flows to the workpiece W, it is possible to prevent the temperature from rising until reaching the quenching temperature, and a precise quenching range can be set. Become. Further, even when only the shield by the positioning member 51 cannot completely shield the magnetic flux from the quenching coil 6, it is effective in suppressing the temperature rise of the small end portion W1.

以上の構成の焼入れ装置の動作について、図2〜図8に基づき、以下に説明する。   The operation of the quenching apparatus having the above configuration will be described below with reference to FIGS.

焼入れ装置1の待機状態においては、図2に示すように、小端部位置決め部材41および焼入れコイル6、小端部スラスト位置決め部材51、大端部中心軸位置決め部材31は、各アクチュエータ32〜52により退避位置に移動されており、大端部ホルダ2は空状態となっている。   In the standby state of the quenching device 1, as shown in FIG. 2, the small end portion positioning member 41 and the quenching coil 6, the small end portion thrust positioning member 51, and the large end portion central axis positioning member 31 are each of the actuators 32 to 52. Is moved to the retracted position, and the large end holder 2 is in an empty state.

焼入れ動作を開始するには、先ず、コンロッドWをその大端部W2の合せ面を下方にして大端部ホルダ2に装入する(図2中の矢印A参照)。この装入に当たって、大端部ホルダ2の底面23の寸法は、コンロッドWの大端部W2の平面寸法に対して若干大きくしているため、円滑に挿入可能となっている。なお、この投入はハンドリングロボット等により行われ、投入されたワークWであるコンロッドは大端部ホルダ2に位置決めされて立設される。   In order to start the quenching operation, first, the connecting rod W is inserted into the large end holder 2 with the mating surface of the large end W2 facing downward (see arrow A in FIG. 2). In this charging, the size of the bottom surface 23 of the large end holder 2 is slightly larger than the planar size of the large end W2 of the connecting rod W, so that it can be inserted smoothly. This loading is performed by a handling robot or the like, and the connecting rod, which is the loaded workpiece W, is positioned and erected on the large end holder 2.

次いで、図3に示すように、小端部位置決め部材41を、小端部W1の上端より10mm程度の作動位置までアクチュエータ42により下降移動させる(図3中の矢印B参照)。この下降移動に伴い焼入れコイル6がコンロッドWのロッドW3回りに配置される。   Next, as shown in FIG. 3, the small end portion positioning member 41 is moved down by the actuator 42 to an operating position of about 10 mm from the upper end of the small end portion W1 (see arrow B in FIG. 3). With this downward movement, the quenching coil 6 is arranged around the rod W3 of the connecting rod W.

次いで、図4に示すように、中心軸位置決め部材31を、大端部ホルダ2の底面23の貫通穴24からアクチュエータ32により上昇させ、大端部W2の軸穴に接触させ、さらに、上昇させる(図4中の矢印C参照)。コンロッドWの小端部W1の上面は、垂直方向において、小端部位置決め部材41のV字の谷と接触して、正面図から見て、上下方向および左右方向の位置決めがなされる。この位置決め過程において、ワークWの小端部W1の上面は、上記の間隔を開けて小端部位置決め部材41のV字の谷と対面して配置されているため、ワークWの倒れなどは生じない。   Next, as shown in FIG. 4, the center shaft positioning member 31 is raised from the through hole 24 in the bottom surface 23 of the large end holder 2 by the actuator 32, is brought into contact with the shaft hole in the large end W 2, and is further raised. (See arrow C in FIG. 4). The upper surface of the small end W1 of the connecting rod W is in contact with the V-shaped valley of the small end positioning member 41 in the vertical direction, and is positioned in the vertical direction and the horizontal direction as seen from the front view. In this positioning process, the upper surface of the small end portion W1 of the workpiece W is arranged to face the V-shaped valley of the small end portion positioning member 41 with the above-described gap therebetween, so that the workpiece W falls down or the like. Absent.

次に、図5に示すように、小端部スラスト位置決め部材51を待機位置から作動位置にアクチュエータ52により移動させる(図5中の矢印D参照)。小端部スラスト位置決め部材51の作動位置への移動により、小端部W1のスラスト面W1Sに接触して両側から挟み込み、コンロッドWはスラスト面W1S方向の位置決めがなされ、先行する位置決め作動と相まって、ワークWの位置が一義的に決定される。小端部W1はスラスト面W1Sに接触した小端部スラスト位置決め部材51により、スラスト面W1SのロッドW3側を覆う。   Next, as shown in FIG. 5, the small end thrust positioning member 51 is moved from the standby position to the operating position by the actuator 52 (see arrow D in FIG. 5). Due to the movement of the small end portion thrust positioning member 51 to the operating position, the small end portion W1 contacts the thrust surface W1S of the small end portion W1 and is sandwiched from both sides, and the connecting rod W is positioned in the thrust surface W1S direction, coupled with the preceding positioning operation, The position of the workpiece W is uniquely determined. The small end portion W1 covers the rod W3 side of the thrust surface W1S with a small end portion thrust positioning member 51 in contact with the thrust surface W1S.

この状態で、焼入れコイル6に高周波電流を印加して、コンロッドWのロッド部W3の表面が加熱され、焼入れ温度への温度上昇の後、図示しない冷却装置、例えば、冷却水がロッドW3表面に噴射されて焼入れされる。このロッドW3表面の焼入れ温度への加熱時、小端部W1はスラスト面W1SのロッドW3側を覆って接している小端部スラスト位置決め部材51により焼入れコイル6からの磁束が遮蔽されるため、焼入れ温度まで達する温度上昇が抑制される。また、焼入れコイル6よりの磁束の遮蔽が充分に行えない場合には、小端部スラスト位置決め部材51それ自体に冷却装置、例えば、内部に冷却水を循環させる等を設けて、小端部W1が温度上昇するのを抑制することができる。この焼入れが終了すると、ワークWを次工程へ搬送するために、ワーク開放作動を開始する。   In this state, a high frequency current is applied to the quenching coil 6 to heat the surface of the rod portion W3 of the connecting rod W. After the temperature rises to the quenching temperature, a cooling device (not shown) such as cooling water is applied to the surface of the rod W3. It is injected and quenched. When heating the surface of the rod W3 to the quenching temperature, the small end W1 is shielded from the magnetic flux from the quenching coil 6 by the small end thrust positioning member 51 that covers and contacts the rod W3 side of the thrust surface W1S. The temperature rise reaching the quenching temperature is suppressed. If the magnetic flux from the quenching coil 6 cannot be sufficiently shielded, the small end portion thrust positioning member 51 itself is provided with a cooling device, for example, circulating cooling water inside, and the small end portion W1. Can be prevented from rising in temperature. When this quenching is completed, the workpiece opening operation is started in order to transport the workpiece W to the next process.

即ち、図6に示すように、先ず、小端部スラスト位置決め部材51がアクチュエータ52により退避位置に後退され(図6中の矢印E参照)、次いで、図7に示すように、大端部中心軸位置決め部材31が退避位置に後退され(図7中の矢印F参照)、最後に、図8に示すように、小端部位置決め部材41が上方の退避位置に移動されて、ワークWであるコンロッドの拘束が完全に開放される(図8中の矢印G参照)。次いで、ハンドリングロボット等の搬送装置により、ワークWであるコンロッドが搬出される。   That is, as shown in FIG. 6, first, the small end thrust positioning member 51 is retracted to the retracted position by the actuator 52 (see the arrow E in FIG. 6), and then, as shown in FIG. The shaft positioning member 31 is retracted to the retracted position (see arrow F in FIG. 7), and finally the small end portion positioning member 41 is moved to the upper retracted position as shown in FIG. The restriction of the connecting rod is completely released (see arrow G in FIG. 8). Next, the connecting rod as the workpiece W is carried out by a transfer device such as a handling robot.

本実施形態においては、以下に記載する効果を奏することができる。   In the present embodiment, the following effects can be achieved.

(ア)ワークWを保持・位置決めする複数の位置決め治具2〜5と、ワークWを高周波電流により電磁誘導加熱する焼入れコイル6とを備え、焼入れ部と非焼入れ部とが隣接するワークWの高周波焼入れ装置1であり、ワークWの焼入れ部と隣接する非焼入れ部を位置決めする位置決め治具2〜5により、焼入れコイル6からワークWの焼入れ部に向けて発せられる磁束の非焼入れ部への侵入を遮蔽するため、非焼入れ部の磁束遮蔽精度を向上させることによるワークWの精密な焼入範囲の調整を可能とし、且つワークWの位置精度向上による焼入精度の向上が可能となる。   (A) A plurality of positioning jigs 2 to 5 for holding and positioning the workpiece W, and a quenching coil 6 for electromagnetically heating the workpiece W with a high frequency current, and the quenching portion and the non-quenching portion are adjacent to each other. It is an induction hardening apparatus 1, and magnetic flux generated from the quenching coil 6 toward the quenching portion of the workpiece W is transferred to the non-quenching portion by the positioning jigs 2 to 5 that position the quenching portion adjacent to the quenching portion of the workpiece W. In order to shield the intrusion, it is possible to adjust the precise quenching range of the workpiece W by improving the magnetic flux shielding accuracy of the non-quenched portion, and it is possible to improve the quenching accuracy by improving the positional accuracy of the workpiece W.

(イ)磁束の非焼入れ部への侵入を遮蔽する位置決め治具5は、冷却手段、例えば、内部に冷却水を循環させる等して、冷却することにより、焼入れコイル6よりの磁束の遮蔽が充分に行えない場合には、位置決め部材51それ自体に冷却装置を設けて、非焼入れ部、例えば、小端部W1が温度上昇するのを抑制することができ、精密な焼入範囲の調整を可能となる。   (B) The positioning jig 5 that shields the penetration of the magnetic flux into the non-quenched portion is cooled by cooling means, for example, circulating cooling water inside, thereby shielding the magnetic flux from the quenching coil 6. If this is not possible, the positioning member 51 itself can be provided with a cooling device to suppress the temperature rise of the non-quenched portion, for example, the small end portion W1, and the precise quenching range can be adjusted. It becomes possible.

(ウ)焼入れコイル6は、ワークWを端面方向から位置決め保持する位置決め治具4に取付けられ、位置決め治具4によるワークWの位置決め保持状態において、ワークWの焼入れ部の周囲に位置決めされるため、ワークWとコイル6との相対位置精度を向上でき、精密な焼入範囲の調整を可能となる。   (C) The quenching coil 6 is attached to the positioning jig 4 that positions and holds the workpiece W from the end surface direction, and is positioned around the quenching portion of the workpiece W in the positioning and holding state of the workpiece W by the positioning jig 4. The relative positional accuracy between the workpiece W and the coil 6 can be improved, and the precise quenching range can be adjusted.

(エ)磁束の非焼入れ部への侵入を遮蔽する位置決め治具5は、前記焼入れコイル6がワークWの焼入れ部の周囲に位置決めされた状態において、非焼入れ部を位置決め保持するため、焼入れコイル6との干渉などを考慮せずに配置することができる。   (D) The positioning jig 5 for shielding the penetration of the magnetic flux into the non-quenched part is a hardened coil for positioning and holding the non-hardened part in a state where the hardened coil 6 is positioned around the hardened part of the workpiece W. 6 can be arranged without considering the interference with 6.

(第2実施形態)
図9〜図15は、本発明を適用した高周波焼入れ装置高周波焼入れ方法の第2実施形態を示し、図9は高周波焼入れ装置の正面図および側面図、図10〜図15は高周波焼入れ装置の作動状態を夫々示す正面図および側面図である。本実施形態においては、吊下げた状態のワーク(コンロッド)に対する高周波焼入れに好適な高周波焼入れ装置を提供するものである。なお、図1〜図8と同一装置・部材には同一符号を付してその説明を省略ないし簡略化する。
(Second Embodiment)
9 to 15 show a second embodiment of the induction hardening method to which the present invention is applied, FIG. 9 is a front view and a side view of the induction hardening apparatus, and FIGS. 10 to 15 are operations of the induction hardening apparatus. It is the front view and side view which show a state, respectively. In this embodiment, the induction hardening apparatus suitable for induction hardening with respect to the workpiece | work (connecting rod) of the suspended state is provided. 1 to 8 are denoted by the same reference numerals, and description thereof is omitted or simplified.

図9に示す第2実施形態の高周波焼入れ装置1においては、ワークであるコンロッドWの大端部W2を保持する手段として、大端部ホルダ2に代えて、大端部W2のロッド部W3との境界部分(肩部)W4に両側から係合する一対の支持ベアリング7を備える。一対の支持ベアリング7は、夫々横棒材71に支持され、この一対の横棒材71は、焼入れ装置1の下部フレーム11から起立させた一対のポスト13に差渡して配置されている。一対のベアリング7には、図示しないが内部に水冷配管が挿通されて冷却可能に構成され、焼入れ加熱時において、支持ベアリング7が過熱されるのを防止するよう構成している。   In the induction hardening apparatus 1 of 2nd Embodiment shown in FIG. 9, it replaces with the large end part holder 2 as a means to hold | maintain the large end part W2 of the connecting rod W which is a workpiece | work, A pair of support bearings 7 engaged with the boundary portion (shoulder portion) W4 is provided. The pair of support bearings 7 are respectively supported by a horizontal bar 71, and the pair of horizontal bars 71 are disposed across a pair of posts 13 erected from the lower frame 11 of the quenching apparatus 1. Although not shown, the pair of bearings 7 are configured to be cooled by inserting water-cooled pipes therein, and are configured to prevent the support bearing 7 from being overheated during quenching heating.

前記コンロッドWは、小端部W1およびロッド部W3を前記支持ベアリング7同士の間に上方から挿入し、その大端部W2を支持ベアリング7同士により支持させて上方に位置させ、ロッド部W3および小端部W1が大端部W2から下方に吊下げられた状態となって支持される。前記一対の支持ベアリング7および横棒材71は、ワークであるコンロッドWの着脱時には、その少なくとも一方を下降可能に構成することにより、着脱時にワークWを横方向から出し入れ可能とすることが、ワークWの脱着が容易となり望ましい。   The connecting rod W has a small end W1 and a rod W3 inserted between the support bearings 7 from above, and the large end W2 is supported by the support bearings 7 so as to be positioned upward. The small end portion W1 is supported by being hung downward from the large end portion W2. The pair of support bearings 7 and the horizontal bar 71 are configured such that at least one of them can be lowered when the connecting rod W, which is a workpiece, is attached / detached, so that the workpiece W can be taken in and out from the side at the time of attachment / detachment. Desorption of W is easy and desirable.

また、大端部中心軸位置決め治具3は、高周波焼入れ装置1の上部フレーム12に配置したアクチュエータ32により位置決め部材31を昇降させて大端部W2のメタル取付面に接近離脱可能としている。そして、位置決め部材31を上昇した退避位置から下降させて作動位置に移動させた際には、前記支持ベアリング7により支持したコンロッドWの大端部W2のメタル保持面に上方から位置決め部材31を係合させて、大端部W2を位置決めするよう構成している。   Further, the large-end center axis positioning jig 3 can move up and down the positioning member 31 by an actuator 32 disposed on the upper frame 12 of the induction hardening apparatus 1 so that the large-end center axis positioning jig 3 can approach and leave the metal mounting surface of the large end W2. When the positioning member 31 is lowered from the raised retracted position and moved to the operating position, the positioning member 31 is engaged with the metal holding surface of the large end W2 of the connecting rod W supported by the support bearing 7 from above. In combination, the large end portion W2 is positioned.

小端部位置決め治具4は、高周波焼入れ装置1の下部フレーム11に配置したアクチュエータ42により位置決め部材41を昇降させて小端部W1に接近離脱可能としている。そして、第1実施形態と同様に、位置決め部材41はワークWの小端部W1に下面から接触させて、小端部W1の位置決めを行うよう小端部W1の外周に係合する傾斜した一対の斜面を備える。また、第1実施形態と同様に、ワークWを取囲んで高周波磁束を発生させる焼入れコイル6の基部が固定されており、焼入れコイル6は位置決め部材41から上方に向かって配置され、位置決め部材41の作動位置への上昇により、位置決め部材41に先行してワークWを取囲み、ワークWの倒れ防止を図りつつ、焼入れしようとする部位回りに配置される。   The small end positioning jig 4 can move up and down the positioning member 41 by an actuator 42 disposed on the lower frame 11 of the induction hardening apparatus 1 so that the small end positioning jig 4 can approach and leave the small end W1. As in the first embodiment, the positioning member 41 is brought into contact with the small end W1 of the workpiece W from the lower surface, and the inclined pair that engages with the outer periphery of the small end W1 so as to position the small end W1. With a slope. Similarly to the first embodiment, the base of the quenching coil 6 that surrounds the workpiece W and generates high-frequency magnetic flux is fixed, and the quenching coil 6 is disposed upward from the positioning member 41. When the workpiece W is raised to the operating position, it surrounds the workpiece W in advance of the positioning member 41 and is arranged around the portion to be quenched while preventing the workpiece W from falling.

小端部スラスト位置決め治具5は、第1実施形態と同様に、焼入れ装置1の下方フレーム11から立設された前記ポスト13に配置され、ワークWの小端部W1の両側のスラスト面W1Sに対向するよう一対の位置決め部材51が対向して配置される。そして、位置決め部材51の待機位置では、ワークW周りへの焼入れコイル6の作動位置への上昇動作、および、ワークW周りからの焼入れコイル6の待機位置への下降動作を許容するよう、ワークWの両スラスト面W1Sから大きく離間されるようにしている。そして、第1実施形態と同様に、ワークWがセットされ且つ焼入れコイル6が作動位置にセットされた段階では、位置決め部材51を背面のアクチュエータ52により押出し、その位置決め部材51をワークWの小端部W1の両側のスラスト面W1Sに夫々着座させて小端部W1を挟み、スラスト方向の位置決めを行う作動位置となる。この作動位置では、位置決め部材51により小端部W1のスラスト面W1SのロッドW3側を覆うことで、隣接して配置される焼入れコイル6よりの磁束が小端部W1側に浸入するのを遮蔽する。   Similarly to the first embodiment, the small end thrust positioning jig 5 is disposed on the post 13 erected from the lower frame 11 of the quenching apparatus 1, and the thrust surfaces W1S on both sides of the small end W1 of the workpiece W are disposed. A pair of positioning members 51 are arranged to face each other. Then, at the standby position of the positioning member 51, the workpiece W is allowed to be moved up to the operating position of the quenching coil 6 around the workpiece W and to be lowered from the periphery of the workpiece W to the standby position. The two thrust surfaces W1S are greatly separated from each other. As in the first embodiment, when the workpiece W is set and the quenching coil 6 is set to the operating position, the positioning member 51 is pushed out by the actuator 52 on the back surface, and the positioning member 51 is pushed to the small end of the workpiece W. It becomes an operation position for positioning in the thrust direction by seating on the thrust surfaces W1S on both sides of the portion W1 and sandwiching the small end portion W1. In this operating position, the positioning member 51 covers the rod W3 side of the thrust surface W1S of the small end W1 to shield the magnetic flux from the quenching coil 6 disposed adjacently from entering the small end W1. To do.

また、前記小端部スラスト位置決め治具5の各アクチュエータ52の下方には、前記小端部スラスト位置決め治具5により位置決めした小端部W1に向けて冷却水を噴射する噴射ノズル8を配置している。噴射ノズル8よりの冷却水は、非焼入れ部である小端部W1を位置決めし且つ磁束の小端部W1への侵入を遮蔽するスラスト位置決め治具5の下面および/またはスラスト位置決め治具5の保持位置を含む小端部W1に対して噴射するよう設定している。   Further, below each actuator 52 of the small end thrust positioning jig 5, an injection nozzle 8 for injecting cooling water toward the small end W1 positioned by the small end thrust positioning jig 5 is disposed. ing. The cooling water from the injection nozzle 8 positions the small end portion W1 which is a non-quenched portion and shields the penetration of the magnetic flux into the small end portion W1 and / or the thrust positioning jig 5. It sets so that it may inject with respect to the small end part W1 containing a holding | maintenance position.

従って、ワークWの小端部W1および小端部スラスト面W1Sを保持している小端部スラスト位置決め治具5の位置決め部材51は冷却水により冷却することができ、温度上昇を抑制することができる。このため、ワークWに焼入れコイル6よりの磁束が流れても、焼入れ温度に達するまで温度上昇されることを防止することができ、精密な焼入れ範囲の設定が可能となる。また、位置決め部材51による遮蔽のみでは焼入れコイル6よりの磁束を完全に遮蔽しきれない場合にも、小端部W1の温度上昇の抑制には有効である。しかも、噴射された冷却水は、スラスト位置決め部材51から下方に流れ落ちるため、上方に位置する焼入れ部であるロッド部W3を冷却することがない。   Therefore, the positioning member 51 of the small end thrust positioning jig 5 holding the small end W1 and the small end thrust surface W1S of the workpiece W can be cooled by the cooling water, and the temperature rise can be suppressed. it can. For this reason, even if the magnetic flux from the quenching coil 6 flows through the workpiece W, it is possible to prevent the temperature from rising until the quenching temperature is reached, and a precise quenching range can be set. Further, even when the magnetic flux from the quenching coil 6 cannot be completely shielded only by the shielding by the positioning member 51, it is effective for suppressing the temperature rise of the small end portion W1. Moreover, since the injected cooling water flows downward from the thrust positioning member 51, the rod portion W3, which is a quenching portion located above, is not cooled.

以上の構成の焼入れ装置の動作について、図10〜図15に基づき、以下に説明する。   The operation of the quenching apparatus having the above configuration will be described below with reference to FIGS.

焼入れ装置1の待機状態においては、図10に示すように、小端部位置決め部材41および焼入れコイル6、小端部スラスト位置決め部材51、大端部中心軸位置決め部材31は、各アクチュエータ32〜52により退避位置に移動されており、一対の支持ベアリング7には、ワークWが架けられていない状態となっている。   In the standby state of the quenching apparatus 1, as shown in FIG. 10, the small end portion positioning member 41 and the quenching coil 6, the small end portion thrust positioning member 51, and the large end portion central axis positioning member 31 are each of the actuators 32 to 52. Thus, the workpiece W is not hung on the pair of support bearings 7.

焼入れ動作を開始するには、先ず、ワークであるコンロッドWをその大端部W2を上方にして一対の支持ベアリング7間に係合させて投入する(図10中の矢印J参照)。なお、この投入はハンドリングロボット等により行われ、投入されたワークWであるコンロッドは一対の支持ベアリング7に大端部W2の肩部W4が位置決めされて吊下げられる。   In order to start the quenching operation, first, the connecting rod W, which is a workpiece, is engaged with the pair of support bearings 7 with its large end W2 facing upward (see arrow J in FIG. 10). The loading is performed by a handling robot or the like, and the connecting rod, which is the loaded workpiece W, is suspended by positioning the shoulder W4 of the large end W2 on the pair of support bearings 7.

次いで、図11に示すように、中心軸位置決め部材31を、アクチュエータ32により下降させ、大端部W2の軸穴に接触させる(図11中の矢印K参照)。この位置決め過程において、ワークWの小端部W1およびロッド部W3は、上記の支持ベアリング7の下方に懸垂状態となっているため、ワークWの倒れなどは生じない。   Next, as shown in FIG. 11, the center shaft positioning member 31 is lowered by the actuator 32 and brought into contact with the shaft hole of the large end W2 (see arrow K in FIG. 11). In this positioning process, since the small end portion W1 and the rod portion W3 of the workpiece W are suspended below the support bearing 7, the workpiece W does not fall down.

次に、小端部位置決め部材41を、小端部W1の下端よりアクチュエータ42により上昇移動させる(図12中の矢印L参照)。この上昇移動に伴い焼入れコイル6がコンロッドWのロッド部W3回りに配置される。コンロッドWの小端部W1の外面は、垂直方向において、小端部位置決め部材41のV字の谷と接触して、正面図から見て、上下方向および左右方向の位置決めがなされる。この位置決め過程において、ワークWの小端部W1の下面は、小端部位置決め部材41のV字の谷と接触するため、ワークWの倒れなどは生じない。   Next, the small end portion positioning member 41 is moved upward by the actuator 42 from the lower end of the small end portion W1 (see arrow L in FIG. 12). With this upward movement, the quenching coil 6 is arranged around the rod portion W3 of the connecting rod W. The outer surface of the small end W1 of the connecting rod W is in contact with the V-shaped valley of the small end positioning member 41 in the vertical direction, and is positioned in the vertical direction and the horizontal direction as viewed from the front view. In this positioning process, the lower surface of the small end portion W1 of the workpiece W is in contact with the V-shaped valley of the small end portion positioning member 41, so that the workpiece W does not fall down.

次に、図9に示すように、小端部スラスト位置決め部材51を待機位置から作動位置にアクチュエータ52により移動させる(図9中の矢印M参照)。小端部スラスト位置決め部材51の作動位置への移動により、小端部W1のスラスト面W1Sに接触して両側から挟み込み、コンロッドWはスラスト面W1S方向の位置決めがなされ、先行する位置決め作動と相まって、ワークWの位置が一義的に決定される。小端部W1はスラスト面W1Sに接触した小端部スラスト位置決め部材51により、スラスト面W1Sのロッド部W3側を覆う。   Next, as shown in FIG. 9, the small end thrust positioning member 51 is moved from the standby position to the operating position by the actuator 52 (see arrow M in FIG. 9). Due to the movement of the small end portion thrust positioning member 51 to the operating position, the small end portion W1 contacts the thrust surface W1S of the small end portion W1 and is sandwiched from both sides, and the connecting rod W is positioned in the thrust surface W1S direction, coupled with the preceding positioning operation, The position of the workpiece W is uniquely determined. The small end portion W1 covers the rod portion W3 side of the thrust surface W1S with the small end portion thrust positioning member 51 in contact with the thrust surface W1S.

この状態で、焼入れコイル6に高周波電流を印加して、コンロッドWのロッド部W3の表面が加熱され、焼入れ温度への温度上昇の後、図示しない冷却装置、例えば、冷却水がロッドW3表面に噴射されて焼入れされる。このロッドW3表面の焼入れ温度への加熱時、大端部W2の肩部W4を支持している支持ベアリング7は内部を流通する冷却媒体により冷却され、温度上昇が抑制される。また、小端部W1はスラスト面W1SのロッドW3側を覆って接している小端部スラスト位置決め部材51により焼入れコイル6からの磁束が遮蔽されており、また、噴射ノズル8より噴射された冷却水により小端部W1およびスラスト位置決め部材51は冷却されるため、焼入れ温度まで達する温度上昇が抑制される。この焼入れが終了すると、ワークWを次工程へ搬送するために、ワーク開放作動を開始する。   In this state, a high frequency current is applied to the quenching coil 6 to heat the surface of the rod portion W3 of the connecting rod W. After the temperature rises to the quenching temperature, a cooling device (not shown) such as cooling water is applied to the surface of the rod W3. It is injected and quenched. At the time of heating the surface of the rod W3 to the quenching temperature, the support bearing 7 supporting the shoulder W4 of the large end W2 is cooled by the cooling medium flowing through the inside, and the temperature rise is suppressed. The small end W1 is shielded from the magnetic flux from the quenching coil 6 by the small end thrust positioning member 51 covering and contacting the rod W3 side of the thrust surface W1S, and the cooling injected from the injection nozzle 8 is performed. Since the small end portion W1 and the thrust positioning member 51 are cooled by water, the temperature rise reaching the quenching temperature is suppressed. When this quenching is completed, the workpiece opening operation is started in order to transport the workpiece W to the next process.

即ち、図13に示すように、先ず、小端部スラスト位置決め部材51がアクチュエータ52により退避位置に後退され(図13中の矢印N参照)、次いで、図14に示すように、小端部位置決め部材41および焼入れコイルが下方の退避位置に移動され(図14中の矢印P参照)、最後に、大端部中心軸位置決め部材31が退避位置に後退され(図15中の矢印Q参照)、ワークWであるコンロッドの拘束が完全に開放される。次いで、ハンドリングロボット等の搬送装置により、ワークWであるコンロッドが一対の支持ベアリング7への係合状態から搬出される(図15中の矢印R参照)。   That is, as shown in FIG. 13, first, the small end thrust positioning member 51 is retracted to the retracted position by the actuator 52 (see arrow N in FIG. 13), and then, as shown in FIG. The member 41 and the quenching coil are moved to the lower retracted position (see arrow P in FIG. 14). Finally, the large end center axis positioning member 31 is retracted to the retracted position (see arrow Q in FIG. 15). The restraint of the connecting rod as the work W is completely released. Next, the connecting rod, which is the workpiece W, is unloaded from the engaged state with the pair of support bearings 7 by a transfer device such as a handling robot (see arrow R in FIG. 15).

本実施形態においては、第1実施形態における効果(ア)、(ウ)、(エ)に加えて以下に記載した効果を奏することができる。   In the present embodiment, in addition to the effects (a), (c), and (d) in the first embodiment, the following effects can be achieved.

(オ)ワークWの非焼入れ部である小端部W1を焼入れ部であるロッド部W3より下方に配置し、小端部W1を位置決めし且つ磁束の小端部W1への侵入を遮蔽するスラスト位置決め治具5の下面および/またはスラスト位置決め治具5の保持位置を含む小端部W1に対して冷却媒体を噴射する冷却手段8を設け、少なくとも高周波加熱の際に、冷却手段8より噴射された冷却媒体により冷却されるようにしているため、強力な磁場の発生により、スラスト位置決め治具5の磁束遮蔽能力を超えてしまった場合においても、ワークWの遮蔽したい小端部W1を安定的に冷却でき、焼き入りが確実に防止できる。   (E) Thrust for disposing the small end portion W1 that is a non-quenched portion of the workpiece W below the rod portion W3 that is a quenched portion, positioning the small end portion W1, and shielding entry of magnetic flux into the small end portion W1 A cooling means 8 for injecting a cooling medium is provided to the lower end W1 including the lower surface of the positioning jig 5 and / or the holding position of the thrust positioning jig 5, and is injected from the cooling means 8 at least during high-frequency heating. Since the cooling medium is cooled, the small end portion W1 to be shielded of the workpiece W can be stably stabilized even when the magnetic flux shielding ability of the thrust positioning jig 5 is exceeded due to generation of a strong magnetic field. It is possible to cool and quenching can be surely prevented.

なお、上記各実施形態において、高周波焼入れ装置1における処理対象物として、内燃機関のコンロッドの高周波焼入時の電磁誘導加熱遮蔽、及び被処理物固定方法について説明したが、図示はしないが、他の対象物であっても、非焼入れ部と焼入れ部とを隣接して備えるものであっても、本発明の高周波焼入れ装置および高周波焼入れ方法を適用できる。   In each of the above-described embodiments, the electromagnetic induction heating shielding and the object fixing method during induction hardening of the connecting rod of the internal combustion engine have been described as the objects to be processed in the induction hardening apparatus 1. The induction hardening apparatus and the induction hardening method of the present invention can be applied even if the object is provided with a non-quenched portion and a quenched portion adjacent to each other.

本発明の第1実施形態を示す高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus which show 1st Embodiment of this invention. 同じく待機状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of a standby state similarly. 同じく図2に続く作動状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of the operating state similarly following FIG. 同じく図3に続く作動状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of the operating state similarly following FIG. 同じく焼入れ作動時の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus at the same time of hardening operation. 同じく図5に続く作動状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of the operating state similarly following FIG. 同じく図6に続く作動状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of the operating state similarly following FIG. 同じく図7に続くワーク開放状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of the workpiece open state similarly following FIG. 本発明の第2実施形態を示す焼入れ作動時の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus at the time of hardening operation which show 2nd Embodiment of this invention. 同じく待機状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of a standby state similarly. 同じく図10に続く作動状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of the operating state similarly following FIG. 同じく図11に続く作動状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of the operating state similarly following FIG. 同じく図9に続く作動状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of the operating state similarly following FIG. 同じく図13に続く作動状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of the operating state similarly following FIG. 同じく図14に続くワーク開放状態の高周波焼入れ装置の正面図(A)および側面図(B)。The front view (A) and side view (B) of the induction hardening apparatus of the workpiece open state similarly following FIG.

符号の説明Explanation of symbols

W ワークとしてのコンロッド
W1 小端部
W2 大端部
W3 ロッド部
1 焼入れ装置
2 大端部ホルダ(位置決め治具)
3 大端部中心軸位置決め治具(位置決め治具)
4 小端部位置決め治具(位置決め治具)
5 小端部スラスト位置決め治具
6 焼入れコイル
7 支持ベアリング
8 冷却手段としての噴射ノズル
31、41、51 位置決め部材
32、42、52 アクチュエータ
W Connecting rod as work W1 Small end W2 Large end W3 Rod 1 Hardening device 2 Large end holder (positioning jig)
3 Large end center axis positioning jig (positioning jig)
4 Small end positioning jig (positioning jig)
5 Small end thrust positioning jig 6 Hardened coil 7 Support bearing 8 Injection nozzle 31, 41, 51 as cooling means Positioning member 32, 42, 52 Actuator

Claims (6)

非焼入れ部である端部を両端に備えると共に両端部を焼入部である連結部により一体に連結してなるワークに対する高周波焼入れ装置であり、ワークの両端部を夫々保持・位置決めする複数の位置決め治具と、ワークの連結部を高周波電流により電磁誘導加熱する焼入れコイルとを備える高周波焼入れ装置において、
前記複数の位置決め治具は、ワークの一端部を包囲・係合してワークを保持する一端部位置決め治具と、前記一端部位置決め治具により保持されたワークの他端部の延長上の待機位置から他端部に向かって接近離脱可能であり、他端部に係合する作動位置において他端部をその外形側から保持して他端部を位置決めする他端部位置決め治具と、他端部位置決め治具により位置決めされた他端部の他端部位置決め治具により覆われていない開放部位と対面する待機位置から他端部の開放部位に接近離脱可能であり、他端部の開放部位と係合する作動位置において他端部の開放部位を覆って焼き入れコイルから発せられる磁束の他端部への侵入を遮蔽した状態で他端部を位置決めする他端部開放部位位置決め治具と、から構成され、
前記焼入コイルは、前記他端部位置決め治具にその基部が固定され、他端部位置決め治具の先端側の延長部分を、ワークにおける連結部の長さ寸法分において取囲んでコイル状に配置されており、前記一端部位置決め治具により保持されたワークに対して他端部位置決め治具の待機位置から作動位置への作動により焼入コイルをワークの連結部を取囲む位置にセットされ、その後の他端部開放部位位置決め治具の待機位置から作動位置への作動後に高周波電流により連結部を電磁誘導加熱することを特徴とする高周波焼入れ装置。
This is an induction hardening apparatus for workpieces that are provided with end portions that are non-quenched portions at both ends, and both ends are integrally connected by connecting portions that are quenched portions, and a plurality of positioning jigs that hold and position both end portions of the workpiece. In an induction hardening apparatus comprising a tool and a quenching coil that electromagnetically heats a connecting portion of a workpiece with a high frequency current,
The plurality of positioning jigs include one end positioning jig that surrounds and engages one end of the work to hold the work, and a standby on the extension of the other end of the work held by the one end positioning jig. The other end positioning jig that positions the other end by holding the other end from the outer shape side in the operating position that engages with the other end and can be moved toward and away from the other end. It is possible to approach and leave the open part of the other end from the standby position facing the open part not covered by the other end part positioning jig of the other end part positioned by the end part positioning jig, and open the other end part. The other end open part positioning jig for positioning the other end part in a state where the open part of the other end part is covered and the intrusion of the magnetic flux generated from the quenching coil into the other end part is shielded at the operating position engaged with the part. And consists of
The hardened coil has a base fixed to the other end portion positioning jig, and encloses an extended portion on the tip end side of the other end portion positioning jig within the length of the connecting portion of the workpiece to form a coil. The hardened coil is set at a position surrounding the work connecting portion by the operation from the standby position of the other end positioning jig to the operating position with respect to the work held by the one end positioning jig. And the induction hardening apparatus characterized by carrying out electromagnetic induction heating of a connection part by a high frequency current after the operation | movement from the stand-by position of the other end part open site | part positioning jig | tool to a working position after that .
前記他端部開放部位位置決め治具は、冷却手段により冷却されることを特徴とする請求項1に記載の高周波焼入れ装置。 The induction hardening apparatus according to claim 1, wherein the other end open portion positioning jig is cooled by a cooling unit. 前記ワークの他端部は焼入れ部である連結部より下方に配置し、他端部を他端部位置決め治具により位置決めし且つ磁束の非焼入れ部への侵入を遮蔽する他端部開放部位位置決め治具の下面および/または他端部開放部位位置決め治具の保持位置を含む非焼入れ部に対して冷却媒体を噴射する冷却手段を設けたことを特徴とする請求項1に記載の高周波焼入れ装置。 The other end portion of the workpiece is disposed below the coupling portion , which is a quenching portion , the other end portion is positioned by the other end portion positioning jig, and the other end open portion positioning that shields the penetration of the magnetic flux into the non-quenched portion is positioned. 2. The induction hardening apparatus according to claim 1, further comprising cooling means for injecting a cooling medium to a non-quenched portion including a holding position of the lower surface of the jig and / or the other end open portion positioning jig. . 非焼入れ部である端部を両端に備えると共に両端部を焼入部である連結部により一体に連結してなるワークに対する高周波焼入れ方法であり、ワークの一端部と他端部とを夫々保持・位置決めする複数の位置決め手段と、ワークの連結部を高周波電流により電磁誘導加熱する焼入れコイルとを備える高周波焼入れ方法において、
前記複数の位置決め手段は、ワークの一端部を包囲・係合してワークを保持する一端部位置決め手段と、前記一端部位置決め手段により保持されたワークの他端部側の延長上の待機位置から他端部に向かって接近離脱可能であり、他端部の外形部に係合する作動位置において他端部を外形側から保持して他端部を位置決めする他端部位置決め手段と、前記他端部位置決め手段により位置決めされた他端部の他端部位置決め手段により覆われていない開放部位と対面する待機位置から他端部の開放部位に接近離脱可能であり、他端部の開放部位と係合する作動位置において他端部の開放部位を夫々覆って約入れコイルから発せられる磁束の他端部への侵入を遮蔽した状態で他端部の開放部位を位置決めする他端部開放部位位置決め手段と、を備え、
前記焼入コイルは、前記他端部位置決め手段にその基部が固定され、他端部位置決め手段の先端側の延長部分を、ワークにおける連結部の長さ寸法分において取囲んでコイル状に配置して構成され、
前記焼入コイルは、前記一端部位置決め手段により保持されたワークに対して他端部位置決め手段の待機位置から作動位置への作動によりワークの連結部を取囲む位置にセットされ、その後の他端部開放部位位置決め手段の待機位置から作動位置への作動後に高周波電流により連結部を電磁誘導加熱することを特徴とする高周波焼入れ方法
This is a high-frequency quenching method for workpieces that are provided with end portions that are non-quenched at both ends, and that both ends are integrally connected by a connecting portion that is a quenched portion, and holds and positions one end and the other end of the workpiece. In the induction hardening method comprising a plurality of positioning means and a hardening coil that electromagnetically heats the connecting portion of the workpiece by high frequency current,
The plurality of positioning means include: one end positioning means for holding and holding the work by surrounding and engaging one end of the work; and a standby position on an extension on the other end side of the work held by the one end positioning means. The other end positioning means for positioning the other end by holding the other end from the outer shape side at an operating position that can be moved toward and away from the other end and engages the outer shape of the other end, The open position of the other end can be approached and separated from the open position of the other end from the standby position facing the open position not covered by the other end positioning means of the other end positioned by the end positioning means. Positioning the open part of the other end while positioning the open part of the other end in a state where the open part of the other end is covered and the penetration of the magnetic flux emitted from the insertion coil into the other end is shielded at the operating position to be engaged. Means ,
The quenching coil has a base fixed to the other end positioning means, and is arranged in a coil shape by surrounding the extension portion on the distal end side of the other end positioning means by the length of the connecting portion of the workpiece. Configured
The quenching coil is set at a position that surrounds the connecting portion of the workpiece by the operation from the standby position of the other end positioning means to the operating position with respect to the work held by the one end positioning means, and the other end thereafter An induction hardening method characterized in that after the operation of the part opening part positioning means from the standby position to the operating position, the connecting portion is heated by electromagnetic induction with a high frequency current .
前記他端部開放部位位置決め手段は、冷却手段により冷却されることを特徴とする請求項4に記載の高周波焼入れ方法。The induction hardening method according to claim 4, wherein the other end portion open portion positioning means is cooled by a cooling means. 前記ワークの他端部は焼入れ部である連結部より下方に配置し、他端部を他端部位置決め手段により位置決めし且つ磁束の非焼入れ部への侵入を遮蔽する他端部開放部位位置決め手段の下面および/または他端部開放部位位置決め手段の保持位置を含む非焼入れ部に対して冷却媒体を噴射する冷却手段を設けたことを特徴とする請求項4に記載の高周波焼入れ方法。 The other end portion of the workpiece is disposed below the connecting portion which is a quenching portion, the other end portion is positioned by the other end positioning means, and the other end open portion positioning means for shielding the penetration of the magnetic flux into the non-quenched portion. 5. The induction hardening method according to claim 4, further comprising cooling means for injecting a cooling medium to a non-quenched portion including a holding position of the lower surface and / or the other end open portion positioning means .
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