JP3851450B2 - Induction heating quenching jig for drive plate and quenching method - Google Patents

Induction heating quenching jig for drive plate and quenching method Download PDF

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JP3851450B2
JP3851450B2 JP19646198A JP19646198A JP3851450B2 JP 3851450 B2 JP3851450 B2 JP 3851450B2 JP 19646198 A JP19646198 A JP 19646198A JP 19646198 A JP19646198 A JP 19646198A JP 3851450 B2 JP3851450 B2 JP 3851450B2
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plate
rim
induction heating
drive plate
quenching
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JP2000017328A (en
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誠語 西岡
益千嘉 松本
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Neturen 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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Description

【０００１】
【発明の属する技術分野】
本発明は、円形鋼板のホイール部の外径部をプレスフォーミングやフローフォーミングなどによって肉厚に加工してリム部を形成させ、そのリム部外周に歯形を成形した自動車のトルクコンバータなどに使用されるドライブプレートの誘導加熱焼入用治具及び焼入方法に関するものである。
【０００２】
【従来の技術】
従来の自動車のトルクコンバータなどに使用されるドライブプレートは、ホイールとリングギアとを別個に製作し、リングギアの歯形を誘導加熱焼入れした後にホイールに焼ばめ、あるいは溶接により固着して一体にして製作された。出願人は、先にこのリングギアの誘導加熱焼入れにおける変形防止のための焼入用治具を開示した（特開平１０−２５５１８号公報）。
【０００３】
近年、自動車の一層のコスト低減と軽量化の要請のため、前記のホイール部とリングギアを別個に作るのでなく、ホイール部とリングギアを一体に製作する方法が開発された。この方法の一つとして、ホイール部を形成する円形鋼板の外径部を折り曲げて積層してリムを形成し、このリム部に切削などにより歯形を形成させる方法がある（特開平２−１９７３４１号公報）。
【０００４】
上記方法により製造されたドライブプレートの歯形を焼入れすると、リムが積層して作られているために加熱焼入れの際に積層がずれたり、積層部が開いたりしてリムに成形された歯形が変形するという問題点がある。かかる変形を防止するために、リム部の両縁をカップ状の治具で押さえて拘束して焼入れする焼入用治具が開示されている（実開平１−１６１２５２号公報、実開平３−９６３４５号公報）。しかし、この焼入用治具は、焼入れする歯形のごく近傍を治具で押さえて誘導加熱するため、誘導磁束により治具の一部が加熱されたり、また加熱する歯形部の熱が治具に伝導して失われ加熱効率が落ちる。したがって、でき得れば歯形から離れた位置で拘束する治具とすることが望ましい。
【０００５】
一方、前記ドライブプレートの製造方法は近年さらに改良されて、外径部をプレスフォーミングやフローフォーミングなどにより肉厚に加工してリム部を形成させ、このリム部に転造などにより歯形を形成させる方法が開発された。
【０００６】
この方法は、従来のホイール部の外径部を繰り返し折り曲げ積層してリムを形成するのでなく、円形鋼板の外径外周をフローフォーミングなどにより肉厚を厚くしてリムを形成させるものである。したがって、歯形の誘導加熱焼入れにおいて、実開平１−１６１２５２号公報などに記載のような積層のリムに起因する歯形の変形はない。
【０００７】
【発明が解決しようとする課題】
しかしながら、この製造方法は、外径外周をフローフォーミング加工などしてリムを形成させるために、歯形を誘導加熱焼入れする際にホイール部に生ずる残留加工歪み応力により、ホイール部にいわゆる「ペコ」が生じてホイール部が波打つ現象が生ずる。この波打ちにより、治具なしに歯形部を誘導加熱すると加熱するリム部が誘導コイルから外れるほど大きく変形することがあり、歯形の誘導加熱焼入れができない場合が生ずる。そして、このホイール部の波打ち現象は前記従来の焼入治具のようにリム部だけを押さえて誘導加熱焼入れする焼入用治具では防止できない。
【０００８】
そこで本発明は、上記問題点を解消し、誘導加熱の熱効率が高く、かつ変形の少ないドライブプレートの誘導加熱焼入用治具及び焼入方法を提供することを目的とする。
【０００９】
【課題を解決するための手段】
上記目的を達成するために、本発明のドライブプレートの誘導加熱焼入用治具及び焼入方法は、円形鋼板のホイール部の外径部にリム部が成形され、該リム部に歯形が形成されたドライブプレートの歯形の誘導加熱焼入れにおいて、前記ホイール部のリム部付根近傍の円周を押圧する外周押圧手段と、前記ホイール部の中心近傍を押圧する中心押圧手段とを備えたことを特徴とするものである。
【００１０】
即ち、本発明の焼入用治具及び方法は、ドライブプレートのホイール部のリム部付根近傍の円周と中心部の軸孔近傍とを押圧して歯形を誘導加熱焼入れすることにより、ホイール部の波打ちとリム部の変形を同時に押さえるものである。従来治具のようにリムの歯形近傍の縁を押さえるのでなく、本発明では外周押圧手段によりホイール部のリム部付根近傍を押圧拘束して誘導加熱するので、歯形の加熱部からの熱伝導による熱ロスが少なく熱効率を向上することができる。また、中心押圧手段によりホイールの中心部の軸孔近傍をも同時に押圧拘束するので、従来方法のようにリム部の縁を押さえなくてもホイール部の波打ちや歯形部の変形を生ずることがない。
【００１１】
本発明のドライブプレートの誘導加熱焼入用治具の前記外周押圧手段は、前記ホイール部のリム部付根近傍の円周の表裏にそれぞれ当接するように配設された表押圧板及び裏押圧板と、該表裏押圧板を互いに緊締して前記リム部付根近傍の円周を拘束する緊締手段とを備え、前記中心押圧手段は、前記ホイール部の中心近傍に当接するように前記表裏押圧板の少なくも一方の押圧板に移動可能に設けられた可動板と、該可動板を前記ホイール部中心近傍を押圧するように移動させて拘束する付圧手段とを備えることが簡易な機構で前記目的を達成するために望ましい。
【００１２】
上記のように本発明の焼入用治具は、従来の治具のように歯形近傍のリム部を拘束するものでなく、誘導加熱される歯形から離れたリム部付根近傍のホイール部の円周を拘束するものであり、従来の治具のように歯形の誘導加熱による誘電磁束の影響が少ないために、上記押圧板はステンレスなどの非磁性材料を使用する必要がなく、加工が容易でコストを低減できる。
【００１３】
【発明の実施の形態】
以下、本発明を図示の一実施形態について具体的に説明する。図１は本発明実施形態のドライブプレートの誘導加熱焼入用治具の断面図、図２（ａ）は本実施形態に使用したドライブプレートの一例の平面図、図２（ｂ）はその断面を示す図である。
【００１４】
本実施形態に使用されたドライブプレート１は、図２に鎖線で示すようにリム径より大径の円形鋼板の外周をフォーミングによって肉厚に成形してホイール部２とリム３が形成されている。リム３の外周にはプレス加工により歯形４が成形される。ホイール部２は図に示すように皿状にプレス加工され、中心に軸孔５とその周辺円周上に取付け孔６が設けられている。説明の便宜上ホイール部２の皿状の凸側を表面、凹側を裏面として説明する。
【００１５】
焼入用治具１０は、図１に示すように椀型の上押圧板（表押圧板）１１と、下押圧板（裏押圧板）２１及び可動板３１などから形成される。
【００１６】
上押圧板１１の外径はドライブプレート１のリム３の内径よりやや小径で、ホイール部２のリム３の付根近傍の表面２ａを押圧する縁部１２を有する円形椀型をなしている。上押圧板１１の中心には緊締ボルト（緊締手段）４１の軸部４３を挿通する貫通孔１３が設けられ、その周囲円周上の等角度に懸垂ボルト３２を挿通する３個の挿通孔１４が設けられている。挿通孔１４は、懸垂ボルト３２の軸部３２ｂを挿通する小径部と頭部３２ａを嵌入させてその首部を支持する大径部とを有する段付き孔になっている。
【００１７】
下押圧板２１は、ドライブプレート１のリム３の内径よりやや小径で、リム３の付根近傍の表面２ａの裏側に当接する縁部２２を有する円形椀型をなしている。下押圧板２１の中心孔２５に基準ノック２４が圧入またはねじ止めにより固定され、その外径にドライブプレート１の軸孔５が嵌装される。基準ノック２４の中心には緊締ボルト４１の軸部４３を挿通する貫通孔が設けられ、下押圧板２１の中心には緊締ボルト４１の小径ねじ４４と螺合するねじ孔２６が設けられている。上下押圧板１１、２１は、ステンレスなどの非磁性体でなく普通鋼材で製作されたが、歯形の誘導加熱の際に押圧板外周の加熱などはみられなかった。
【００１８】
可動板３１は、ホイール部２の軸孔５の周辺に当接する当接面３１ｂを有するリング状をなし、リングの中心孔３１ａに基準ノック２４が出入りできるようになっている。そして、可動板３１は上押圧板１１の挿通孔１４に挿通された３本の懸垂ボルト３２により上押圧板１１に吊り下げられて保持されている。懸垂ボルト３２はねじ部３２ｃを締緩することにより当接面３１ｂと懸垂ボルト３２の頭部３２ａの先端との距離が同一になるように調節できる。
【００１９】
緊締ボルト（緊締手段）４１は、大径ねじ４２と軸部４３と、その先端側の小径ねじ４４を有する段付軸をなしている。緊締ボルト４１を上押圧板１１の貫通孔１３に挿通して、小径ねじ部４４を下押圧板２１のねじ孔２６に螺締することにより上押圧板１１を下押圧板２１に押圧することができる。大径ねじ４２にはリングナット５１が螺嵌され、その下面５１ａが前記の懸垂ボルト３２の頭部３２ａの先端に当接する。緊締ボルト４１を下押圧板２１に螺嵌した状態でリングナット５１を締めると、懸垂ボルト３２を介して可動板３１が治具１０に装着したドライブプレート１の中心部を押圧する。このとき前述のように可動板３１の当接面３１ｂと懸垂ボルト３２の頭部３２ａの先端との距離が同一に調節されているので、ドライブプレート１の中心部の円周が均等に押圧される。リングナット５１の下面５１ａは摩耗防止のため焼入硬化処理しておくことが望ましく、また懸垂ボルト３２の頭部３２ａの先端はリングナット５１の下面５１ａに均等に接するように球面にして摩耗を防止するために焼入硬化などしておくことが望ましい。
【００２０】
以下、上記構成の焼入治具の動作について説明する。まず、緊締ボルト４１を外して上押圧板１１を除いた状態で、被焼入ドライブプレート１をその軸孔５を基準ノック２４に挿通し、ホイール部の凸側の表面を上にして下押圧板２１の上に載せる。すると、軸孔５を基準としてドライブプレートは下押圧板２１と同心に載置される。
【００２１】
次に、下押圧板２１の上に載せたドライブプレート１の上に、可動板３１を装着した上押圧板１１をかぶせて置き、緊締ボルト４１を貫通孔１３に挿通してその小径ねじ４４を下押圧板２１のねじ孔２６に螺締する。このとき、リングナット５１は大径ねじ４２に対して緩めておき、懸垂ボルト３２が挿通孔１４を滑動して可動板３１が上下に自由に移動できるようにしておく。すると、ドライブプレート１のホイール部２のリム３の付根近傍の円周が上押圧板１１と下押圧板２１のそれぞれの縁部１２及び２２の間で押圧されて拘束される。
【００２２】
次にリングナット５１を緊締ボルト４１の大径ねじ４２に螺嵌して締めると、その当接面５１ａが懸垂ボルト３２の頭部先端に当接して、懸垂ボルト３２を介して可動板３１がドライブプレート１を押圧するように移動し、その当接面３１ｂがドライブプレート１のホイール部２の軸孔５の周辺（中心部近傍）を押圧して拘束する。
【００２３】
こうして、上押圧板１１と下押圧板２１のそれぞれの縁部１２及び２２によりドライブプレート１のホイール部のリム付根の円周を拘束するとともに、可動板３１の当接面３１ｂで軸孔５の周辺（中心部近傍）を押圧して拘束する。このドライブプレート１を装着した焼入治具１０全体を、図示しない手段により回転しながら誘導加熱コイル６０に通電して歯形４を誘導加熱する。そして、歯形が焼入温度に昇温後に図示しない手段で冷却液を噴射して急冷して歯形を焼入れする。
【００２４】
【実施例】
上記構成の誘導加熱焼入用治具を用い、ドライブプレートの歯形を焼入れして変形を調査した。使用したドライブプレートの寸法形状を図２に示す。歯形を焼入れしたドライブプレートは、図２（ｂ）に示すＳ面を定盤の上に置き、高さゲージで図のＡ，Ｂ，Ｃ位置について円周上の９０度ごとに寸法を測定した。その実験結果は表１に示す。
【００２５】
【表１】

Figure 0003851450
【００２６】
表から分かるように、本発明の焼入治具を使用して歯形焼入れしたドライブプレートＮｏ．１〜５の焼入れ後の平坦度のばらつきは、リム部のＡで０．０４〜０．０７ｍｍ、ホイール部の外周付近Ｂで０．０５〜０．０９ｍｍ、中心軸孔周辺では０．０５〜０．０７ｍｍであり、この値は焼入れ前の素材の平坦度とほぼ同等で、焼入れによる波打ちなどの変形はほとんどみられなかった。一方、可動板３１は使用せず軸孔５の近傍は拘束しないで、上下押圧板の縁部でリム近傍の円周部のみを押圧して焼入れしたドライブプレートＮｏ．６は、Ｂ位置の円周上でも最大０．６ｍｍの波打ちがみられ、Ｃ位置では１．６ｍｍと大きく変形した。また、治具を使用しないで加熱したドライブプレートＮｏ．７は、加熱中変形により歯形部が誘導加熱コイルからはみ出して加熱が不能であった。
【００２７】
また、本発明の焼入治具では、治具のドライブプレートの周辺を拘束する外周部が誘導加熱される歯形から遠いので、誘導電流による上下押圧板外周の温度上昇は認められず、また、従来の焼入治具のようにリム部を直接押さえるのでなく、上下押圧板の縁部でリム付根部のホイール周辺を押さえるので、歯形加熱の際の治具に伝導する熱量が少ないため昇温が早く、実測はできなかったが従来の治具より熱効率がよいものと解される。
【００２８】
【発明の効果】
以上説明したように、本発明のドライブプレートの誘導加熱焼入用治具及び焼入方法によれば、円形鋼板のホイール部の外径部にリムを成形したドライブプレートの歯形の誘導加熱焼入れにおいて、歪みが少なく熱効率のよい焼入れができ、後工程の歪み取りなどが不要になってコストが低減できるとともに、量産が容易になる。
【図面の簡単な説明】
【図１】本発明のドライブプレートの誘導加熱焼入用治具の断面図である。
【図２】本発明実施例に使用したドライブプレートの形状を示す図である。
【符号の説明】
１ ドライブプレート
２ ホイール部
２ａ リム付根表面部
３ リム（リム部）
４ 歯形
５ 軸孔
６ 取付け孔
１０ 焼入用治具
１１ 上押圧板（表押圧板、外周押圧手段）
１２ 縁部
１３ 貫通孔
１４ 挿通孔
２１ 下押圧板（裏押圧板、外周押圧手段）
２２ 縁部
２３ 底部
２３ａ 固定受面
２４ 基準ノック
２５ 中心孔
２６ ねじ孔
３１ 可動板（中心押圧手段）
３１ａ 中心孔
３２ 懸垂ボルト
３２ａ 頭部
３２ｂ 軸部
３２ｃ ねじ部
４１ 緊締ボルト（緊締手段）
４２ 大径ねじ
４３ 軸部
４４ 小径ねじ
４５ 角部
５１ リングナット（付圧手段）
６０ 誘導加熱コイル[0001]
BACKGROUND OF THE INVENTION
The present invention is used in an automotive torque converter or the like in which the outer diameter part of a wheel part of a circular steel plate is processed into a rim part by press forming or flow forming to form a rim part, and a tooth profile is formed on the outer periphery of the rim part. This invention relates to an induction heating and quenching jig for a drive plate and a quenching method.
[0002]
[Prior art]
Drive plates used in conventional torque converters for automobiles are manufactured separately from the wheel and ring gear, and the tooth shape of the ring gear is induction-heated and hardened to the wheel or fixed by welding. Produced. The applicant previously disclosed a quenching jig for preventing deformation in induction heating and quenching of the ring gear (Japanese Patent Laid-Open No. 10-25518).
[0003]
In recent years, in order to further reduce the cost and weight of automobiles, a method has been developed in which the wheel portion and the ring gear are integrally manufactured, instead of separately making the wheel portion and the ring gear. As one of the methods, there is a method of forming a rim by bending and laminating outer diameter portions of a circular steel plate forming a wheel portion, and forming a tooth profile by cutting or the like on this rim portion (Japanese Patent Laid-Open No. 2-197341). Publication).
[0004]
When the tooth profile of the drive plate manufactured by the above method is quenched, the rim is made by stacking, so the stacking is shifted during heating and quenching, or the stack is opened and the tooth profile formed on the rim is deformed. There is a problem of doing. In order to prevent such deformation, a quenching jig is disclosed in which both edges of the rim portion are pressed and restrained by a cup-shaped jig and hardened (Japanese Utility Model Laid-Open No. 1-161252, Japanese Utility Model Laid-Open No. 3- No. 96345). However, since this quenching jig is induction-heated by pressing the vicinity of the tooth profile to be quenched with the jig, a part of the jig is heated by the induction magnetic flux, or the heat of the tooth profile portion to be heated is the jig. Heat is lost due to conduction. Therefore, if possible, it is desirable to use a jig that restrains at a position away from the tooth profile.
[0005]
On the other hand, the drive plate manufacturing method has been further improved in recent years, and the outer diameter portion is processed to be thick by press forming or flow forming to form a rim portion, and a tooth profile is formed on the rim portion by rolling or the like. A method was developed.
[0006]
This method does not form the rim by repeatedly bending and laminating the outer diameter portion of the conventional wheel portion, but forming the rim by thickening the outer circumference of the circular steel plate by flow forming or the like. Therefore, in the induction heating quenching of the tooth profile, there is no deformation of the tooth profile due to the laminated rim as described in Japanese Utility Model Laid-Open No. 1-161252.
[0007]
[Problems to be solved by the invention]
However, in this manufacturing method, in order to form a rim by performing flow forming on the outer periphery of the outer diameter, so-called “peco” is generated in the wheel portion due to residual processing strain stress generated in the wheel portion when the tooth profile is induction-hardened. A phenomenon occurs in which the wheel portion undulates. If the tooth profile is induction-heated without a jig due to this undulation, the rim to be heated may be deformed so much that it is removed from the induction coil, and the tooth profile cannot be induction-heated and quenched. And the wavy phenomenon of this wheel part cannot be prevented with the hardening jig | tool which hold | suppresses only a rim | limb part and is induction-heat-hardened like the said conventional hardening jig | tool.
[0008]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a drive plate induction heating quenching jig and a quenching method for a drive plate having high thermal efficiency of induction heating and little deformation.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the induction heating quenching jig and quenching method of the drive plate of the present invention, a rim portion is formed on the outer diameter portion of the wheel portion of the circular steel plate, and a tooth profile is formed on the rim portion. In the induction heating and quenching of the tooth profile of the drive plate, it is provided with an outer peripheral pressing means for pressing the circumference near the root of the rim portion of the wheel portion, and a central pressing means for pressing the vicinity of the center of the wheel portion. It is what.
[0010]
That is, the quenching jig and method of the present invention presses the circumference near the root of the rim portion of the wheel portion of the drive plate and the vicinity of the shaft hole of the center portion to induction-heat quench the tooth profile, thereby This suppresses the undulation and deformation of the rim at the same time. Instead of pressing the edge near the tooth profile of the rim as in the conventional jig, in the present invention, the periphery pressing means presses and restrains the vicinity of the root of the rim of the wheel part, so that induction heating is performed. Thermal efficiency can be improved with little heat loss. In addition, since the central pressing means simultaneously presses and restrains the vicinity of the shaft hole in the central portion of the wheel, the undulation of the wheel portion and the deformation of the tooth profile portion do not occur without pressing the edge of the rim portion as in the conventional method. .
[0011]
The outer pressing means of the induction heating and quenching jig for a drive plate according to the present invention includes a front pressing plate and a rear pressing plate arranged so as to abut on the front and back of the circumference in the vicinity of the rim root of the wheel portion, respectively. And fastening means for fastening the front and back pressing plates to each other and restraining the circumference in the vicinity of the root of the rim portion, the center pressing means of the front and back pressing plates so as to contact the vicinity of the center of the wheel portion. It is a simple mechanism to include a movable plate movably provided on at least one of the pressing plates, and a pressing means for moving and restraining the movable plate so as to press the vicinity of the center of the wheel portion. Desirable to achieve.
[0012]
As described above, the quenching jig of the present invention does not restrain the rim portion near the tooth profile like the conventional jig, but the wheel portion circle near the root of the rim portion away from the induction heated tooth profile. Since the circumference is constrained and the influence of the dielectric magnetic flux due to induction heating of the tooth profile is small as in the conventional jig, the pressing plate does not need to use a non-magnetic material such as stainless steel, and is easy to process. Cost can be reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described with reference to an illustrated embodiment. 1 is a cross-sectional view of an induction heating and hardening jig for a drive plate according to an embodiment of the present invention, FIG. 2A is a plan view of an example of a drive plate used in the present embodiment, and FIG. FIG.
[0014]
The drive plate 1 used in the present embodiment has a wheel portion 2 and a rim 3 formed by forming the outer periphery of a circular steel plate having a diameter larger than the rim diameter to a thickness by forming as shown by a chain line in FIG. . A tooth profile 4 is formed on the outer periphery of the rim 3 by pressing. The wheel portion 2 is pressed into a dish shape as shown in the figure, and a shaft hole 5 is provided at the center and a mounting hole 6 is provided on the periphery of the shaft hole 5. For convenience of explanation, the dish-like convex side of the wheel portion 2 will be described as the front surface and the concave side will be described as the back surface.
[0015]
As shown in FIG. 1, the quenching jig 10 is formed of a bowl-shaped upper pressing plate (front pressing plate) 11, a lower pressing plate (back pressing plate) 21, a movable plate 31, and the like.
[0016]
The outer diameter of the upper pressing plate 11 is slightly smaller than the inner diameter of the rim 3 of the drive plate 1 and has a circular saddle shape having an edge 12 that presses the surface 2 a near the root of the rim 3 of the wheel portion 2. A through hole 13 through which the shaft 43 of the tightening bolt (tightening means) 41 is inserted is provided at the center of the upper pressing plate 11, and three through holes 14 through which the suspension bolt 32 is inserted at an equal angle on the circumference thereof. Is provided. The insertion hole 14 is a stepped hole having a small diameter portion through which the shaft portion 32b of the suspension bolt 32 is inserted and a large diameter portion into which the head portion 32a is inserted to support the neck portion.
[0017]
The lower pressing plate 21 has a circular saddle shape that is slightly smaller than the inner diameter of the rim 3 of the drive plate 1 and has an edge portion 22 that abuts against the back side of the surface 2 a in the vicinity of the root of the rim 3. The reference knock 24 is fixed to the center hole 25 of the lower pressing plate 21 by press-fitting or screwing, and the shaft hole 5 of the drive plate 1 is fitted to the outer diameter thereof. A through hole through which the shaft portion 43 of the tightening bolt 41 is inserted is provided at the center of the reference knock 24, and a screw hole 26 to be engaged with the small diameter screw 44 of the tightening bolt 41 is provided at the center of the lower pressing plate 21. . The upper and lower pressing plates 11 and 21 were made of ordinary steel instead of a non-magnetic material such as stainless steel, but heating of the outer periphery of the pressing plate was not observed during induction heating of the tooth profile.
[0018]
The movable plate 31 has a ring shape having an abutment surface 31b that abuts the periphery of the shaft hole 5 of the wheel portion 2, and the reference knock 24 can enter and exit the center hole 31a of the ring. The movable plate 31 is suspended and held on the upper pressing plate 11 by three suspension bolts 32 inserted through the insertion holes 14 of the upper pressing plate 11. The suspension bolt 32 can be adjusted so that the distance between the contact surface 31b and the tip of the head portion 32a of the suspension bolt 32 is the same by tightening or loosening the threaded portion 32c.
[0019]
The tightening bolt (tightening means) 41 forms a stepped shaft having a large-diameter screw 42, a shaft portion 43, and a small-diameter screw 44 on the tip side. It is possible to press the upper pressing plate 11 against the lower pressing plate 21 by inserting the tightening bolt 41 into the through hole 13 of the upper pressing plate 11 and screwing the small diameter screw portion 44 into the screw hole 26 of the lower pressing plate 21. it can. A ring nut 51 is screwed onto the large-diameter screw 42, and a lower surface 51 a abuts against the tip of the head portion 32 a of the suspension bolt 32. When the ring nut 51 is tightened in a state where the tightening bolt 41 is screwed to the lower pressing plate 21, the movable plate 31 presses the center portion of the drive plate 1 attached to the jig 10 via the suspension bolt 32. At this time, since the distance between the contact surface 31b of the movable plate 31 and the tip of the head 32a of the suspension bolt 32 is adjusted to be the same as described above, the circumference of the center portion of the drive plate 1 is evenly pressed. The The lower surface 51a of the ring nut 51 is preferably hardened and hardened to prevent wear, and the tip of the head 32a of the suspension bolt 32 has a spherical surface so as to contact the lower surface 51a of the ring nut 51 evenly. In order to prevent this, it is desirable to perform quench hardening.
[0020]
Hereinafter, the operation of the quenching jig having the above configuration will be described. First, with the tightening bolt 41 removed and the upper pressing plate 11 removed, the drive plate 1 to be hardened is inserted through the shaft hole 5 into the reference knock 24 and pressed downward with the convex surface of the wheel portion facing upward. Place on the plate 21. Then, the drive plate is placed concentrically with the lower pressing plate 21 with the shaft hole 5 as a reference.
[0021]
Next, the upper pressing plate 11 on which the movable plate 31 is mounted is placed on the drive plate 1 placed on the lower pressing plate 21, and the tightening bolt 41 is inserted into the through hole 13 and the small diameter screw 44 is attached. Screw into the screw hole 26 of the lower pressing plate 21. At this time, the ring nut 51 is loosened with respect to the large-diameter screw 42 so that the suspension bolt 32 slides through the insertion hole 14 so that the movable plate 31 can freely move up and down. Then, the circumference in the vicinity of the root of the rim 3 of the wheel portion 2 of the drive plate 1 is pressed and restrained between the respective edge portions 12 and 22 of the upper pressing plate 11 and the lower pressing plate 21.
[0022]
Next, when the ring nut 51 is screwed into the large-diameter screw 42 of the tightening bolt 41 and tightened, the contact surface 51 a comes into contact with the tip of the head of the suspension bolt 32, and the movable plate 31 is moved via the suspension bolt 32. The drive plate 1 moves so as to press, and the contact surface 31b presses and restrains the periphery (near the center) of the shaft hole 5 of the wheel portion 2 of the drive plate 1.
[0023]
In this way, the edges 12 and 22 of the upper pressing plate 11 and the lower pressing plate 21 constrain the circumference of the rim root of the wheel portion of the drive plate 1, and the shaft hole 5 on the contact surface 31 b of the movable plate 31. Press and restrain the periphery (near the center). The entire quenching jig 10 equipped with the drive plate 1 is energized to the induction heating coil 60 while being rotated by means (not shown) to inductively heat the tooth profile 4. Then, after the tooth profile is raised to the quenching temperature, a cooling liquid is injected by means (not shown) and rapidly cooled to quench the tooth profile.
[0024]
【Example】
Using the induction heating and quenching jig having the above configuration, the tooth profile of the drive plate was quenched and the deformation was investigated. The dimensions and shape of the drive plate used are shown in FIG. The drive plate in which the tooth profile was quenched was placed on the surface plate as shown in FIG. 2B, and the dimensions were measured every 90 degrees on the circumference with respect to the A, B, and C positions in the figure with a height gauge. . The experimental results are shown in Table 1.
[0025]
[Table 1]
Figure 0003851450
[0026]
As can be seen from the table, the drive plate No. 7 was hardened by using the quenching jig of the present invention. The flatness variation after quenching of 1 to 5 is 0.04 to 0.07 mm at the rim portion A, 0.05 to 0.09 mm at the outer periphery B of the wheel portion, and 0.05 to 0.05 around the central shaft hole. This value was 0.07 mm, which was almost equal to the flatness of the material before quenching, and almost no deformation such as waving due to quenching was observed. On the other hand, the movable plate 31 is not used and the vicinity of the shaft hole 5 is not constrained, and only the circumferential portion near the rim is pressed and quenched by the edge of the upper and lower pressing plates. No. 6 had a maximum wavy of 0.6 mm on the circumference of the B position, and was greatly deformed to 1.6 mm at the C position. In addition, the drive plate No. heated without using a jig was used. In No. 7, the tooth profile protruded from the induction heating coil due to deformation during heating, and heating was impossible.
[0027]
Further, in the quenching jig of the present invention, since the outer peripheral portion that restrains the periphery of the drive plate of the jig is far from the tooth profile that is induction-heated, the temperature rise of the upper and lower pressing plate outer periphery due to the induction current is not recognized, Rather than pressing the rim directly like a conventional quenching jig, the edge of the rim root is pressed by the edge of the upper and lower pressing plates, so the amount of heat conducted to the jig when heating the tooth profile is low, so the temperature rises However, it was understood that the thermal efficiency was better than that of the conventional jig, although the actual measurement was not possible.
[0028]
【The invention's effect】
As described above, according to the induction heating quenching jig and quenching method of the drive plate of the present invention, in the induction heating quenching of the tooth profile of the drive plate in which the rim is formed on the outer diameter portion of the wheel portion of the circular steel plate. Therefore, quenching can be performed with less distortion and good thermal efficiency, eliminating the need for distortion removal in the subsequent process, reducing costs, and facilitating mass production.
[Brief description of the drawings]
FIG. 1 is a sectional view of a jig for induction heating and hardening of a drive plate according to the present invention.
FIG. 2 is a diagram showing the shape of a drive plate used in an embodiment of the present invention.
[Explanation of symbols]
1 Drive plate 2 Wheel 2a Rim root surface 3 Rim (rim)
4 Tooth profile 5 Shaft hole 6 Mounting hole 10 Hardening jig 11 Upper pressing plate (front pressing plate, outer peripheral pressing means)
12 Edge 13 Through-hole 14 Insertion hole 21 Lower pressing plate (back pressing plate, outer periphery pressing means)
22 edge 23 bottom 23a fixed receiving surface 24 reference knock 25 center hole 26 screw hole 31 movable plate (center pressing means)
31a Center hole 32 Suspension bolt 32a Head part 32b Shaft part 32c Screw part 41 Tightening bolt (tightening means)
42 Large diameter screw 43 Shaft portion 44 Small diameter screw 45 Corner portion 51 Ring nut (pressure means)
60 induction heating coil

Claims (3)

円形鋼板のホイール部の外径部にリム部が成形され、該リム部に歯形が形成されたドライブプレートの歯形の誘導加熱焼入れにおいて、前記ホイール部のリム部付根近傍の円周を押圧する外周押圧手段と、前記ホイール部の中心近傍を押圧する中心押圧手段とを備えたことを特徴とするドライブプレートの誘導加熱焼入用治具。In the induction heating and quenching of the tooth profile of the drive plate in which the rim portion is formed on the outer diameter portion of the wheel portion of the circular steel plate and the tooth shape is formed on the rim portion, the outer periphery that presses the circumference in the vicinity of the root of the rim portion of the wheel portion An induction heating and hardening jig for a drive plate, comprising: pressing means; and center pressing means for pressing the vicinity of the center of the wheel portion. 前記外周押圧手段は、前記ホイール部のリム部付根近傍の円周の表裏にそれぞれ当接するように配設された表押圧板及び裏押圧板と、該表裏押圧板を互いに緊締して前記リム部付根近傍の円周を拘束する緊締手段とを備え、前記中心押圧手段は、前記ホイール部の中心近傍に当接するように前記表裏押圧板の少なくも一方の押圧板に移動可能に設けられた可動板と、該可動板を前記ホイール部中心近傍を押圧するように移動させて拘束する付圧手段とを備えたことを特徴とする請求項１に記載のドライブプレートの誘導加熱焼入用治具。The outer peripheral pressing means includes a front pressing plate and a rear pressing plate disposed so as to contact the front and back of the circumference in the vicinity of the root of the rim portion of the wheel portion, and the rim portion Tightening means for constraining the circumference in the vicinity of the root, and the center pressing means is movably provided on at least one pressing plate of the front and back pressing plates so as to abut near the center of the wheel portion. 2. The jig for induction heating and hardening of a drive plate according to claim 1, further comprising a plate and pressing means for moving and restraining the movable plate so as to press the vicinity of the center of the wheel portion. . 円形鋼板のホイール部の外径部にリム部が成形され、該リム部に歯形が形成されたドライブプレートの歯形の誘導加熱焼入れにおいて、前記ホイール部のリム部付根近傍の円周を押圧拘束するとともに、前記ホイール部の中心近傍を押圧拘束してリム部に成形された歯形を誘導加熱により加熱焼入れすることを特徴とするドライブプレートの誘導加熱焼入方法。In the induction heating and quenching of the tooth profile of the drive plate in which the rim portion is formed on the outer diameter portion of the wheel portion of the circular steel plate and the tooth shape is formed on the rim portion, the circumference in the vicinity of the root of the rim portion of the wheel portion is pressed and restrained. In addition, a drive plate induction heating and hardening method characterized in that the tooth shape formed in the rim portion is pressed and constrained near the center of the wheel portion and induction hardening is performed by induction heating.
JP19646198A 1998-06-29 1998-06-29 Induction heating quenching jig for drive plate and quenching method Expired - Lifetime JP3851450B2 (en)

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JP4662275B2 (en) * 2006-03-30 2011-03-30 高周波熱錬株式会社 Drive plate induction heating coil, quenching jig, and quenching method
KR100780841B1 (en) 2006-06-23 2007-11-29 주식회사 엠에스 오토텍 A press-type jig device for local heat treatment
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