JP3595353B2

JP3595353B2 - Heating inductor

Info

Publication number: JP3595353B2
Application number: JP3719394A
Authority: JP
Inventors: 嘉昌田中; 久田渕
Original assignee: Neturen Co Ltd
Current assignee: Neturen Co Ltd
Priority date: 1994-03-08
Filing date: 1994-03-08
Publication date: 2004-12-02
Anticipated expiration: 2019-12-02
Also published as: JPH07249484A

Description

【０００１】
【産業上の利用分野】
本発明は、加熱誘導子に係り、詳細には、クランクシャフトのピンジャーナル部分の焼入れに好適な加熱誘導子に関する。
【０００２】
【従来の技術】
従来、クランクシャフトのようにピン部やジャーナル部の径が小さい場合の被焼入れ部の加熱用コイルとしては、例えば、本出願人によって先に出願された特公昭４８−１４２１６号公報に記載された「高周波加熱処理分割型誘導子」があり、また、特公昭５６−２４３５６号公報に記載された「二次誘導子組合せ型誘導加熱コイル」がある。
【０００３】
すなわち、前者の場合、１ターン誘導子を３分割として焼入時に分割した内の可動コイルをシリンダーにより他方の固定コイルの端面に渉触させて誘導子を構成する構造である。また、後者の場合は、一次誘導子と二次誘導子とを移動可能に組合せることによって、所定対向面を被加熱部材の周に沿う構成の加熱部を形成し、その加熱部を構成する一次誘導子側の加熱導体の被加熱部材への対向面と二次誘導子側の加熱導体とを相対的に変化させることによって、被加熱部材に所望の形状の焼入層を得られるようにしている。
【０００４】
しかし、この加熱コイルの場合、通常のクランクシャフトのピン部やジャーナル部を加熱する場合には問題ないが、ピン部に接続する連結部のショルダが極めて小質量の形状を有するクランクシャフトを加熱する場合は、ピン部のトップ側に連結するショルダ部分までが加熱されてしまい、急冷、焼入れ時にショルダ部分の焼割れが生じたり、焼割れを生じないまでも硬度が高くなっているため、使用時に欠けが発生する等の問題が発生する。
【０００５】
【発明が解決しようとする課題】
しかしながら、上記従来のクランクシャフトのピン部やジャーナル部の径が小さい被焼入れ部の加熱用コイルにあっては、前者は、分割誘導子で常時一定の押圧力で誘導子を構成する構造であり、後者は、一次誘導子と二次誘導子を備え、その一次誘導子と二次誘導子の被加熱部材との相対位置関係を調整し、あるいは一次誘導子と二次誘導子の形状を調整して焼入れ部を調整する構成となっていたため、以下に述べるような問題点があった。
【０００６】
（１）焼入れ幅のバラツキが大きい。
【０００７】
すなわち、図１０に示すように、円周状での焼入れ幅のバラツキが３〜４ｍｍ程度と大きく、油穴部近傍での焼入れ幅が大きくなる。これは、被加熱部材のセットの度に、分割誘導子を渉触して、１ターン誘導子を構成するため、誘導子の接触可能な面積は、誘導子を構成する部材の両端切断面の接触でしかないため、分割コイルの被加熱部材に対向する加熱部の接点当りが変動し、その接点の接触面積が一定せず、被加熱部材表面に誘導される電流が不安定になって、接点部分で加熱される被加熱部の焼入れ幅が一定しなくなる。
【０００８】
（２）焼入れ深さが深くなる。
【０００９】
すなわち、図１１に焼入層の断面を示すように、焼入れ深さが３〜４ｍｍ程度と深くなる。これは、加熱コイルが１ターンコイルのため、そのコイル幅中央部における磁束発生が密になり、コイル幅中央部に対向する被加熱部材の焼入れ深さが深くなる傾向にある。このため、ジャーナル部に設けられている油穴がオーバーヒートして、図１２に示すように油穴に割れが生じる場合がある。
【００１０】
（３）焼入れした後の被加熱部材の熱変形が、０．５〜０．６ｍｍと大きい。
このため、焼入れした後に、この歪みを取るための再加工が必要になる。
【００１１】
（４）加熱コイルが大きいため、狭い間隔の被加熱部を加熱することができない。
【００１２】
すなわち、従来の加熱コイルの場合、被加熱部材の加熱部の幅が、例えば、図１３に示すように、１８ｍｍ位までの物は加熱可能であるが、加熱部の幅が１８ｍｍ以下の物の場合は、上記（２）と同様に、加熱誘導子の厚みを薄くすると、電力の集中が起き、焼入れ深さが深くなるため、加熱することができない。
【００１３】
このため、加熱コイルの消耗が早く、繰り返し使用可能加熱回数が５万回程度で交換する必要がある。
【００１４】
〔目的〕
本発明は、上記従来の多くの課題を解決し、構造が複雑なクランクシャフトのジャーナル部等に良好な焼入層を形成することができる加熱誘導子を提供することを目的とする。
【００１５】
【課題を解決するための手段】
本発明の手段は次の通りである。
【００１６】
請求項１記載の発明は、
半円弧状を有する一組の角筒導体部材が間に当該角筒導体部材と物理的に接触する電気絶縁部材を介在した状態で一体化され、前記角筒導体部材の延在方向両端部にブロック状の接続部が設けられた一方側の構成部材と、
半円弧状を有する一組の角筒導体部材が間に当該角筒導体部材と物理的に接触する電気絶縁部材を介在した状態で一体化され、前記角筒導体部材の延在方向両端部に前記一方側の構成部材の接続部に対応するブロック状の接続部が設けられ、前記一方側の構成部材と対を成す他方側の構成部材と、を備え、
前記一方側の構成部材における角筒導体部材の半円弧状部分の半円中心に対して前記他側の構成部材を１８０度の位置に対向配置し、前記一方側の構成部材の接続部と前記他方側の構成部材の接続部とを接続することにより略円筒形の２ターン加熱誘導子を形成するとともに、２ターン加熱誘導子の内周部に被加熱部材を囲む加熱部を構成し、
前記角筒導体部材に高周波電源を接続し、当該高周波電源から２ターン加熱誘導子に供給される高周波電力により被加熱部材表面を加熱するとともに、前記角筒導体部材間に挟まれた絶縁部材に対向する被加熱部材表面の加熱を軽減し、当該被加熱部材表面の加熱深さ及び加熱幅を均一化することを特徴としている。
【００１７】
請求項２記載の発明は、
略半円筒を形成するように複数組の半円弧状を有する角筒導体部材が間に当該角筒導体部材と物理的に接触する電気絶縁部材を介在させた状態で一体化され、前記角筒導体部材の延在方向両端部にブロック状の接続部が設けられた一方側の構成部材と、
略半円筒を形成するように複数組の半円弧状を有する角筒導体部材が間に当該角筒導体部材と物理的に接触する電気絶縁部材を介在させた状態で一体化され、前記角筒導体部材の延在方向両端部に前記一方側の半円弧状加熱誘導子構成部材の接続部に対応するブロック状の接続部が設けられ、前記一方側の構成部材と対を成す他方側の構成部材と、を備え、
前記一方側の構成部材における角筒導体部材の半円弧状部分の半円中心に対して前記他側の構成部材を１８０度の位置に対向配置し、前記一方側の構成部材の接続部と前記他方側の構成部材の接続部とを接続することにより略円筒形の複数ターン加熱誘導子を形成するとともに、複数ターン加熱誘導子の内周部に被加熱部材を囲む加熱部を構成し、
前記角筒導体部材に高周波電源を接続し、当該高周波電源から複数ターン加熱誘導子に供給される高周波電力により、被加熱部材表面を加熱するとともに、前記角筒導体部材間に挟まれる絶縁部材に対向する被加熱部材表面の加熱を軽減し、当該被加熱部材表面の加熱深さ及び加熱幅を均一化することを特徴としている。
【００１９】
【作用】
本発明の手段の作用は次の通りである。
【００２０】
請求項１記載の発明によれば、
半円弧状を有する一組の角筒導体部材が間に当該角筒導体部材と物理的に接触する電気絶縁部材を介在した状態で一体化され、前記角筒導体部材の延在方向両端部にブロック状の接続部が設けられた一方側の構成部材と、半円弧状を有する一組の角筒導体部材が間に当該角筒導体部材と物理的に接触する電気絶縁部材を介在した状態で一体化され、前記角筒導体部材の延在方向両端部に前記一方側の構成部材の接続部に対応するブロック状の接続部が設けられ、前記一方側の構成部材と対を成す他方側の構成部材と、を備え、前記一方側の構成部材における角筒導体部材の半円弧状部分の半円中心に対して前記他側の構成部材を１８０度の位置に対向配置し、前記一方側の構成部材の接続部と前記他方側の構成部材の接続部とを接続することにより略円筒形の２ターン加熱誘導子を形成し、この２ターン加熱誘導子の形状、幅、又は電気絶縁部材の厚さを調整することで、被加熱部材表面の焼入れ幅及び焼入れ深さを選択することができる。
【００２１】
また、角筒導体部材の延在方向両端部にブロック状の接続部が設けられたことで、一方側の構成部材の角筒導体部材と他方側の構成部材の角筒導体部材とを強固に接続することができるため、加熱部の接点当たりの変動を抑え、接続部分の接触面積を確実に確保することができ、常に一定の電流を加熱誘導子に供給することができる。
【００２３】
したがって、被加熱部材表面の任意位置を選択的に加熱焼入れ処理することができるとともに、その焼入層の幅方向及び深さ方向をより均一かつ浅く形成することができる。
【００２４】
その結果、加熱焼入れ処理を行った後の被加熱部材の熱変形度合を従来に比べて格段に小さくすることができ、従来のように油穴に割れ等を発生させることを回避することができるとともに、歪みを取るための加工処理も省略することができる。
【００２６】
【実施例】
以下、本発明の好適な実施例を図を参照して説明する。
【００２７】
図１〜図９は、本発明の加熱誘導子としての加熱コイルの一実施例を示す図である。
【００２８】
図１は、加熱コイル１を構成する各構成部材を分割した状態の外観斜視図である。図１において、加熱コイル１は、半円弧状を有する一組の角筒導体部材２、３が間に角筒導体部材２、３と物理的に接触し角筒導体部材２、３間を電気的に絶縁する電気絶縁部材としての絶縁部材６を介在した状態で一体化され、角筒導体部材２、３の延在方向両端部にブロック状の接続部１１、１２、１３が設けられ、電流供給ケーブル（図示せず）が電流供給部３′に接続された一方側の構成部材としての半円弧状誘導子８と、半円弧状を有する一組の角筒導体部材４、５が間に角筒導体部材４、５と物理的に接触し角筒導体部材４、５間を電気的に絶縁する電気絶縁部材としての絶縁部材７を介在した状態で一体化され、角筒導体部材４、５の延在方向両端部に半円弧状誘導子８の接続部１１、１２、１３に対応するブロック状の接続部１４、１５、１６が設けられて電流供給ケーブル（図示せず）が電流供給部２′に接続され、半円弧状誘導子８と対を成す他方側の構成部材としての半円弧状誘導子９と、により構成されている。
【００２９】
図１、３において、半円弧状誘導子８における角筒導体部材２、３の半円弧状部分の半円中心に対して半円弧状誘導子９を１８０度の位置に対向配置し、半円弧状誘導子８の接続部１１、１２、１３と半円弧状誘導子９の接続部１４、１５、１６とを接続することにより、図２に示すように２ターンコイル２０を形成し、電流供給部２′、３′に接続される電流供給ケーブルを介して供給される供給電流Ｉは、図２に示す矢印方向に流れる。
【００３０】
また、この２ターンコイル２０の内周には、被加熱部材を非接触状態で囲む加熱部２０ａが形成され、電流供給ケーブルを介して供給される供給電流により加熱部２０ａに囲まれる被加熱部材表面に誘導電流を発生させて被加熱部材表面を加熱することによって、焼入れを行う。
【００３１】
なお、絶縁部材６、７には、ポリエステルガラスクロスやＩＧ板等が利用される。
【００３２】
図３は、図１の加熱コイル１を構成する半円弧状誘導子８、９に水冷ジャケット２１、２２を取り付けた状態の外観斜視図である。
【００３３】
この水冷ジャケット２１、２２は、半円弧状誘導子８、９をそれぞれ図中上下方向から覆うように取り付けられ、各水冷ジャケット２１、２２には、２ヶ所づつ焼入水を供給する焼入水取入口２１ａ、２１ｂ、２２ａ、２２ｂが設けられている。これらの焼入水取入口２１ａ、２１ｂ、２２ａ、２２ｂは、それぞれ水冷ジャケット２１、２２内を貫通して形成された放水孔（図示せず）に通じており、図中加熱部２０ａに囲まれる被加熱部材表面に対して焼入水を放出するように形成されている。
【００３４】
したがって、本実施例の加熱コイル１では、水冷ジャケット２１、２２を取り付け可能としたため、加熱部２０ａに囲まれて加熱焼入れ後の被加熱部材表面は、焼入水取入口２１ａ、２１ｂ、２２ａ、２２ｂを通して放水孔から放射される焼入水により冷却されるとともに、半円弧状誘導子８、９自信も焼入水によって冷却されるため、繰り返し使用する場合の使用回数を従来の加熱しないコイルに比べてコイルの多くすることができ、コイルの寿命を延ばすことができる。
【００３５】
また、図中“Ａ，Ｂ，Ｃ”で示す矢印は、加熱部２０ａにセットされて加熱される被加熱部材の焼入れ状態を比較する際に基準となる加熱位置を示している。
次に、本実施例の動作を説明する。
【００３６】
以下、本実施例の加熱コイル１を利用してクランクシャフトのジャーナル部を加熱焼入れする場合について説明する。
【００３７】
まず、上記図１に示したように、本実施例の加熱コイル１は、従来のように形状の異なる一次誘導子と二次誘導子から構成されるものではなく、略同一構成の半円弧状誘導子８、９から構成され、複数ターンの加熱コイルであるため、ジャーナル部の幅が狭く小径のクランクシャフトに対しても、そのジャーナル部の幅及び径に合わせて、２ターンコイル２０を形成する上記図１に示した角筒導体部材２〜５の半円弧状部分の半径と幅、及び半円弧状誘導子８の角筒導体部材２、３の間に挟まれる絶縁部材６及び半円弧状誘導子９の角筒導体部材４、５の間に挟まれる絶縁部材７の幅又は形状を設計変更するだけで、容易に対応することができる構成となっている。
【００３８】
このため、本実施例の加熱コイル１を利用することによって、上記従来の図１３に示した加熱要部の幅が１８ｍｍ以下の被加熱物に対しても容易に対応することができるとともに、幅の狭い小径部の円周表面を一度に短時間で加熱して焼入れすることができるため、従来に比べて供給電力を抑えることができる。
【００３９】
本実施例の加熱コイル１の加熱部２０ａに通して加熱焼入れ処理したクランクシャフトのジャーナル部における焼入れ層の状態の一例を図４〜図６に示す。これらの図は、加熱焼入れ処理されたジャーナル表面をエッチング処理して焼入れ層と非焼入れ層を明確にしたものである。
【００４０】
まず、図４は、上記図３に示した加熱部２０ａを形成する内周において加熱されたクランクシャフトのジャーナル部表面の一部を示す図である。この図４において、ジャーナル部には、油穴が設けられており、図４において示される“Ａ部，Ｂ部，Ｃ部”は、それぞれ上記図３に示した加熱部２０ａの加熱位置に対向する位置を示している。
【００４１】
また、図５（ａ）、（ｂ）は、その加熱焼入れ処理されたジャーナル部の“Ａ部，Ｂ部”の焼入層の断面を示す図であり、図６（ａ）〜（ｃ）は、その加熱焼入れ処理されたジャーナル部の“Ｃ部”の焼入層の断面を示す図である。
【００４２】
したがって、本実施例の加熱コイル１を利用して加熱焼入れ処理をすると、図４に示すジャーナル部の焼入れ層の幅方向及び図５及び図６に示すジャーナル部の焼入れ層の深さ方向を、従来の加熱コイルを加熱焼入れした場合に比べて均一かつ浅く（２．５〜３．０ｍｍ程度）形成することができる。
【００４３】
その結果、加熱焼入れ処理を行った後のジャーナル部の熱変形度合を従来に比べて格段に小さくすることができ、従来のように油穴に割れ等を発生させることを回避することができるとともに、歪みを取るための加工処理も省略することができる。
【００４４】
その焼入れ層の浅さ及び熱変形の少なさを利用して、例えば、図７に示すように、ネジ穴が形成されて薄い肉厚部分の加熱焼入れ処理を行ったとしても、ネジ穴の形状を歪ませることなく、必要な部分だけ焼入層を形成することができる。
さらに、本実施例の加熱コイル１は、２ターンコイル２０を構成する半円弧状誘導子８の角筒導体部材２、３の間に絶縁部材６及び半円弧状誘導子９の角筒導体部材４、５の間に絶縁部材７を挟むことによって、各ターン内周毎に分離した加熱部２０ａを形成するようにしたため、その絶縁部材６、７の幅を調整することにより、例えば、図８に示すように、各ターン内周毎の加熱部２０ａに対向する被加熱部材表面の任意の位置に２箇所の焼入層を形成することができる。
【００４５】
また、図９に示すように、油穴を避けるように２ターンコイルの間隔を設計することもでき、油穴を避けて加熱焼入れ処理をすることもできる。このように油穴を避けた焼入れ処理を可能とすることにより、加熱焼入れ処理をした後に油穴の面とり加工を０．５〜１．０ｍｍ程度行ったしても、その焼入層が油穴に達していないため、焼割れ等の発生を避けることができる。
【００４６】
さらに、本実施例の加熱コイル１では、加熱焼入れ処理後は、水冷ジャケット２１、２２の焼入水取入口２１ａ、２１ｂ、２２ａ、２２ｂから注入されて放水孔から放射される焼入水により加熱部２０ａを通される被加熱部材と加熱コイル１を構成する半円弧状誘導子８、９自信も冷却するようにしたため、コイルの繰り返し使用可能加熱回数を従来の５万回程度から２０万回程度と大幅に長寿命化することができる。
【００４７】
以上本発明によってなされた発明を実施例に基づき具体的に説明したが、本発明は上記実施例に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能であることはいうまでもない。例えば、上記加熱コイル１を２ターンコイル構成としたが、略半円筒を形成するように複数組の半円弧状を有する角筒導体部材が間に角筒導体部材と物理的に接触する電気絶縁部材を介在させた状態で一体化され、角筒導体部材の延在方向両端部にブロック状の接続部が設けられた一方側の半円弧状誘導子と、略半円筒を形成するように複数組の半円弧状を有する角筒導体部材が間に角筒導体部材と物理的に接触する電気絶縁部材を介在させた状態で一体化され、角筒導体部材の延在方向両端部に一方側の半円弧状誘導子の接続部に対応するブロック状の接続部が設けられ、一方側の半円弧状誘導子と対を成す他方側の半円弧状加熱誘導子と、を備え、前記一方側の半円弧状誘導子における角筒導体部材の半円弧状部分の半円中心に対して他方側の半円弧状誘導子を１８０度の位置に対向配置し、一方側の半円弧状誘導子の接続部と他方側の半円弧状誘導子の接続部とを接続して３〜４ターン（複数ターン）のコイル構成としてもよい。
【００４８】
この３〜４ターンコイル構成とした場合は、被加熱部材表面の複数ヶ所をより多く選択的に加熱焼入れ処理することができる。
【００４９】
【発明の効果】
本発明によれば、被加熱部材表面の任意位置を選択的に加熱焼入れ処理することができるとともに、その焼入層の幅方向及び深さ方向をより均一かつ浅く形成することができる。
【００５０】
その結果、加熱焼入れ処理を行った後の被加熱部材の熱変形度合を従来に比べて格段に小さくすることができ、従来のように被加熱部材の油穴に割れ等を発生させることを回避することができるとともに、歪みを取るための加工処理も省略することができる。
【００５１】
さらに、加熱焼入れ処理後は、水冷ジャケットから放射される焼入水により被加熱部材と加熱部を構成する半円弧状誘導子を同時に冷却することができるため、加熱コイルの繰り返し使用可能加熱回数を増やして大幅に長寿命化することができる。
【図面の簡単な説明】
【図１】本発明の加熱コイルを構成する各構成部材を分割した状態の外観斜視図。
【図２】図１の加熱コイルにおいて形成される２ターンコイルを示す図。
【図３】図１の加熱コイルを構成する半円弧状誘導子に水冷ジャケットを取り付けた状態の外観斜視図。
【図４】図３の加熱部を形成する内周において加熱されたクランクシャフトのジャーナル部表面の一部を示す図。
【図５】図４のジャーナル部の“Ａ部，Ｂ部”の焼入層の断面を示す図。
【図６】図４のジャーナル部の“Ｃ部”の焼入層の断面を示す図。
【図７】ネジ穴が形成されている薄い肉厚部分に対して加熱焼入れ処理した場合の焼入層の断面を示す図。
【図８】２ターン内周加熱部に対向して加熱焼入れ処理された被加熱部材の焼入層の断面を示す図。
【図９】油穴に合わせて構成した２ターン内周加熱部に対向して加熱焼入れ処理された被加熱部材の焼入層の断面を示す図。
【図１０】従来の加熱コイルによって加熱焼入れ処理された被加熱部材の円周状での焼入れ幅の様子を示す図。
【図１１】図１０の焼入層の断面を示す図。
【図１２】従来の加熱コイルによって加熱焼入れ処理された油穴を有する被加熱部材の円周状での焼入れの様子を示す図。
【図１３】従来の加熱コイルによって加熱焼入れ処理が可能な被加熱部材の加熱幅を示す図。[0001]
[Industrial applications]
The present invention relates to a heating inductor , and more particularly, to a heating inductor suitable for quenching a pin journal portion of a crankshaft.
[0002]
[Prior art]
Conventionally, as a heating coil for a quenched portion when the diameter of a pin portion or a journal portion is small like a crankshaft, for example, a coil described in Japanese Patent Publication No. 48-14216 previously filed by the present applicant has been described. There is a "high-frequency heat treatment split type inductor", and a "secondary inductor combination type induction heating coil" described in Japanese Patent Publication No. 56-24356.
[0003]
That is, in the former case, the one-turn inductor is divided into three parts and the movable coil, which is divided at the time of quenching, is brought into contact with the end face of the other fixed coil by the cylinder to form an inductor. In the latter case, the primary inductor and the secondary inductor are movably combined to form a heating unit having a configuration in which a predetermined facing surface is arranged along the circumference of the member to be heated, and the heating unit is configured. By relatively changing the surface of the heating conductor on the side of the primary inductor facing the member to be heated and the heating conductor on the side of the secondary inductor, a quenched layer of a desired shape can be obtained on the member to be heated. ing.
[0004]
However, in the case of this heating coil, although there is no problem when heating the pin portion and the journal portion of the normal crankshaft, the shoulder of the connecting portion connected to the pin portion heats the crankshaft having a very small mass shape. In the case, the shoulder part connected to the top side of the pin part is heated, and the shoulder part is cracked at the time of quenching and quenching, or the hardness is high even if it does not cause cracking. Problems such as chipping occur.
[0005]
[Problems to be solved by the invention]
However, in the conventional coil for heating a hardened portion having a small diameter of a pin portion or a journal portion of a crankshaft, the former has a structure in which a split inductor is used to always form an inductor with a constant pressing force. The latter has a primary inductor and a secondary inductor, and adjusts the relative positional relationship between the primary inductor and the heated member of the secondary inductor, or adjusts the shapes of the primary inductor and the secondary inductor Since the configuration is such that the quenched portion is adjusted by the quenching process, there are the following problems.
[0006]
(1) Variation in quenching width is large.
[0007]
That is, as shown in FIG. 10, the variation of the quenching width in the circumferential shape is as large as about 3 to 4 mm, and the quenching width in the vicinity of the oil hole becomes large. This is because each time the heated member is set, the divided inductor touches and forms a one-turn inductor, so that the contactable area of the inductor is equal to the cut surface at both ends of the member forming the inductor. Since there is only contact, the contact of the contact point of the heating unit facing the heated member of the split coil fluctuates, the contact area of the contact is not constant, and the current induced on the surface of the heated member becomes unstable, The quenching width of the portion to be heated heated at the contact portion is not constant.
[0008]
(2) The quenching depth increases.
[0009]
That is, as shown in the cross section of the quenched layer in FIG. 11, the quenching depth is as deep as about 3 to 4 mm. This is because, since the heating coil is a one-turn coil, the generation of magnetic flux at the center of the coil width becomes dense, and the quenching depth of the member to be heated facing the center of the coil width tends to be deep. For this reason, the oil hole provided in the journal portion may overheat, and the oil hole may be cracked as shown in FIG.
[0010]
(3) The thermal deformation of the heated member after quenching is as large as 0.5 to 0.6 mm.
For this reason, after quenching, rework is required to remove this distortion.
[0011]
(4) Since the heating coil is large, it is not possible to heat the heated portion at a narrow interval.
[0012]
That is, in the case of the conventional heating coil, the width of the heating portion of the member to be heated can be heated, for example, as shown in FIG. 13, up to about 18 mm, but the width of the heating portion is 18 mm or less. In this case, similarly to the above (2), when the thickness of the heating inductor is reduced, concentration of electric power occurs and the quenching depth increases, so that heating cannot be performed.
[0013]
For this reason, the heating coil is quickly consumed, and needs to be replaced when the number of times of reusable heating is about 50,000 times.
[0014]
〔Purpose〕
An object of the present invention is to solve the above-mentioned many problems in the related art and to provide a heating inductor capable of forming a good quenched layer in a journal portion of a crankshaft having a complicated structure.
[0015]
[Means for Solving the Problems]
The means of the present invention are as follows.
[0016]
The invention according to claim 1 is
A pair of rectangular conductor members having a semicircular arc shape are integrated with an electrical insulating member that physically contacts the rectangular conductor members interposed therebetween, and are provided at both ends in the extending direction of the rectangular conductor members. A component member on one side provided with a block-shaped connection portion ,
A pair of rectangular conductor members having a semicircular arc shape are integrated with an electrical insulating member that physically contacts the rectangular conductor members interposed therebetween, and are provided at both ends in the extending direction of the rectangular conductor members. A block-shaped connection portion corresponding to the connection portion of the one-side component member is provided, and the other-side component member paired with the one-side component member ,
Said one of said other side of the construction member with respect to the semicircle center of semicircular portions of the square tube conductor member on the side of the construction member disposed opposite to the position of 180 degrees, the one wherein the connecting portion on the side of the component A substantially cylindrical two-turn heating inductor is formed by connecting the connecting part of the other component member, and a heating part surrounding the member to be heated is formed on the inner periphery of the two-turn heating inductor,
A high-frequency power source is connected to the square-tube conductor member, and the surface of the member to be heated is heated by high-frequency power supplied from the high-frequency power source to the two-turn heating inductor, and the insulating member sandwiched between the square-tube conductor members It is characterized in that the heating of the surface of the member to be heated facing is reduced and the heating depth and the heating width of the surface of the member to be heated are made uniform.
[0017]
The invention according to claim 2 is
A plurality of sets of rectangular cylindrical conductor members having a semicircular arc shape are formed in such a manner as to form a substantially semi-cylindrical shape with an electrical insulating member physically in contact with the rectangular cylindrical conductor members interposed therebetween, and A component member on one side in which block-shaped connecting portions are provided at both ends in the extending direction of the conductor member ,
A plurality of sets of rectangular cylindrical conductor members having a semicircular arc shape are formed in such a manner as to form a substantially semi-cylindrical shape with an electrical insulating member physically in contact with the rectangular cylindrical conductor members interposed therebetween, and Block-shaped connecting portions corresponding to the connecting portions of the one-sided semicircular arc-shaped heating inductor constituent member are provided at both ends in the extending direction of the conductor member, and the other-side structure forming a pair with the one-side constituent member is provided. And a member ,
Said one of said other side of the construction member with respect to the semicircle center of semicircular portions of the square tube conductor member on the side of the construction member disposed opposite to the position of 180 degrees, the one wherein the connecting portion on the side of the component By forming a substantially cylindrical multi-turn heating inductor by connecting the connection part of the other side of the component, and forming a heating unit surrounding the member to be heated on the inner peripheral portion of the multi-turn heating inductor,
A high-frequency power source is connected to the rectangular cylindrical conductor member, and the high-frequency power supplied to the heating inductor from the high-frequency power source heats the surface of the member to be heated, and the insulating member sandwiched between the rectangular cylindrical conductor members. It is characterized in that the heating of the surface of the member to be heated facing is reduced and the heating depth and the heating width of the surface of the member to be heated are made uniform.
[0019]
[Action]
The operation of the means of the present invention is as follows.
[0020]
According to the first aspect of the present invention,
A pair of rectangular conductor members having a semicircular arc shape are integrated with an electrical insulating member that physically contacts the rectangular conductor members interposed therebetween, and are provided at both ends in the extending direction of the rectangular conductor members. A component on one side provided with a block-shaped connection portion , and a set of rectangular conductor members having a semicircular arc shape, with an electrical insulating member that physically contacts the rectangular conductor members interposed therebetween. Integrated, block-shaped connecting portions corresponding to the connecting portions of the one side component member are provided at both ends in the extending direction of the rectangular tubular conductor member, and the other side paired with the one side component member is provided . It includes construction and members, and the one the other side of the construction member with respect to the semicircle center of semicircular portions of the square tube conductor member on the side of the construction member disposed opposite to the position of 180 degrees, of the one side connecting the connecting portion of the structure member and the connecting portion of the other side of the component More form a two-turn heating inductor of substantially cylindrical shape of the two-turn heating inductor, width, or the electrically insulating member by adjusting the thickness, the hardening width and hardening depth of the heated member surface You can choose.
[0021]
In addition, since the block-shaped connecting portions are provided at both ends in the extending direction of the rectangular cylindrical conductor member, the rectangular cylindrical conductor member of one side component and the rectangular cylindrical conductor member of the other side component are firmly connected. Since the connection can be made, the variation per contact point of the heating unit can be suppressed, the contact area of the connection part can be reliably ensured, and a constant current can always be supplied to the heating inductor.
[0023]
Therefore, it is possible to selectively heat and quench any position on the surface of the member to be heated, and to form the quenched layer more uniformly and shallowly in the width direction and the depth direction.
[0024]
As a result, the degree of thermal deformation of the member to be heated after performing the heat quenching treatment can be significantly reduced as compared with the related art, and the occurrence of cracks or the like in the oil hole as in the related art can be avoided. At the same time, processing for removing distortion can be omitted.
[0026]
【Example】
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0027]
1 to 9 are views showing one embodiment of a heating coil as a heating inductor of the present invention.
[0028]
FIG. 1 is an external perspective view of a state in which each component constituting the heating coil 1 is divided. In FIG. 1, a heating coil 1 includes a pair of rectangular conductor members 2, 3 having a semicircular arc shape , and makes physical contact with the rectangular conductor members 2, 3 to electrically connect the rectangular conductor members 2, 3. to be integrated insulating member 6 as an electrical insulating member for insulating a state interposed, block-shaped connecting portions 11, 12, 13 are provided in the extending direction both end portions of the square tube conductor member 2, the current A semi-circular inductor 8 as a component on one side to which a supply cable (not shown) is connected to the current supply section 3 ' is interposed between a pair of square-tube conductor members 4 and 5 having a semi-arc shape. The rectangular tubular conductor members 4 and 5 are physically integrated with each other with an insulating member 7 as an electrical insulating member interposed therebetween for physically contacting and electrically insulating the rectangular tubular conductor members 4 and 5 therebetween . extending direction both end portions of the 5 connecting block-shaped corresponding to the connecting portions 11, 12, 13 of semicircular inductor 8 14, 15 and 16 are connected to the (not shown) current supply cable provided with current supply section 2 ', semicircular inductor 9 as the other side of the component forming the semicircular arc inductor 8 and pairs , And is constituted.
[0029]
1 and 3 , a semi-circular inductor 9 is disposed at a position 180 degrees opposite to a center of a semi- circle of a semi-circular portion of each of the rectangular cylindrical conductor members 2 and 3 in the semi-circular inductor 8 , and by connecting the connecting portion 14, 15 and 16 of the connecting portion 11, 12, 13 and semi-circular inductor 9 arcuate inductor 8 to form a two-turn coil 20 as shown in FIG. 2, the current supply The supply current I supplied via the current supply cable connected to the sections 2 ', 3' flows in the direction of the arrow shown in FIG .
[0030]
On the inner periphery of the two-turn coil 20, there is formed a heating portion 20a surrounding the heated member in a non-contact state, and the heated member surrounded by the heating portion 20a by the supply current supplied through the current supply cable. Quenching is performed by generating an induced current on the surface to heat the surface of the member to be heated.
[0031]
Note that a polyester glass cloth, an IG plate, or the like is used for the insulating members 6 and 7.
[0032]
FIG. 3 is an external perspective view of a state where the water cooling jackets 21 and 22 are attached to the semicircular inductors 8 and 9 constituting the heating coil 1 of FIG.
[0033]
The water cooling jackets 21 and 22 are attached so as to cover the semicircular inductors 8 and 9 from above and below in the drawing, respectively, and each of the water cooling jackets 21 and 22 is provided with a quenching water inlet for supplying quenching water at two locations. 21a, 21b, 22a and 22b are provided. These quenching water inlets 21a, 21b, 22a, 22b communicate with water discharge holes (not shown) formed through the water cooling jackets 21, 22, respectively, and are covered by a heating unit 20a in the figure. It is formed so as to release quenching water to the surface of the heating member.
[0034]
Therefore, in the heating coil 1 of the present embodiment, since the water cooling jackets 21 and 22 can be attached, the surface of the member to be heated after the heating and quenching surrounded by the heating unit 20a has the quenching water inlets 21a, 21b, 22a and 22b. Is cooled by the quenching water radiated from the water discharge hole through the water outlet, and the semi-circular inductors 8 and 9 are also cooled by the quenching water. Can increase the life of the coil.
[0035]
Arrows indicated by “A, B, C” in the figure indicate heating positions that are used as references when comparing the quenched state of the member to be heated set and heated in the heating unit 20a.
Next, the operation of this embodiment will be described.
[0036]
Hereinafter, a case where the journal portion of the crankshaft is heated and quenched using the heating coil 1 of the present embodiment will be described.
[0037]
First, as shown in FIG. 1, the heating coil 1 according to the present embodiment does not include a primary inductor and a secondary inductor having different shapes as in the related art, but has a semicircular arc shape having substantially the same configuration. Since the heating coil is composed of the inductors 8 and 9 and has a plurality of turns, the two-turn coil 20 is formed in accordance with the width and the diameter of the journal even for a small-diameter crankshaft having a narrow journal. The radius and width of the semicircular portions of the rectangular conductor members 2 to 5 shown in FIG. 1 described above , and the insulating member 6 and the semicircle sandwiched between the rectangular conductor members 2 and 3 of the semicircular inductor 8 The configuration is such that the width or shape of the insulating member 7 sandwiched between the rectangular tubular conductor members 4 and 5 of the arc-shaped inductor 9 can be easily coped with only by changing the design.
[0038]
For this reason, by using the heating coil 1 of the present embodiment, it is possible to easily cope with an object to be heated having a width of 18 mm or less as shown in FIG. Since the circumferential surface of the small-diameter portion having a small diameter can be heated and quenched at a time in a short time, power supply can be suppressed as compared with the related art.
[0039]
FIGS. 4 to 6 show an example of the state of the quenched layer in the journal portion of the crankshaft which has been heated and quenched through the heating section 20a of the heating coil 1 of the present embodiment. In these figures, the quenched layer and the non-quenched layer are clarified by etching the surface of the journal that has been subjected to heat quenching.
[0040]
First, FIG. 4 is a diagram showing a part of the surface of the journal portion of the crankshaft heated on the inner periphery forming the heating portion 20a shown in FIG. In FIG. 4, the journal portion is provided with an oil hole, and "A portion, B portion, and C portion" shown in FIG. 4 respectively face the heating position of the heating portion 20a shown in FIG. Position.
[0041]
FIGS. 5 (a) and 5 (b) are cross-sectional views of the quenched layers of the "A portion, B portion" of the journal portion subjected to the heat quenching process, and FIGS. 6 (a) to 6 (c). FIG. 4 is a diagram showing a cross section of a quenched layer of a “C portion” of the journal portion subjected to the heat quenching treatment.
[0042]
Therefore, when the heating and quenching treatment is performed using the heating coil 1 of the present embodiment, the width direction of the quenched layer of the journal portion shown in FIG. 4 and the depth direction of the quenched layer of the journal portion shown in FIGS. It can be formed to be uniform and shallow (about 2.5 to 3.0 mm) as compared with the case where a conventional heating coil is heated and quenched.
[0043]
As a result, the degree of thermal deformation of the journal portion after performing the heat quenching treatment can be significantly reduced as compared with the related art, and it is possible to avoid the occurrence of cracks or the like in the oil hole as in the related art. Processing for removing distortion can also be omitted.
[0044]
By utilizing the shallowness of the quenched layer and the small thermal deformation, for example, as shown in FIG. 7, even if a screw hole is formed and a thin-walled portion is heated and quenched, the shape of the screw hole can be reduced. Quenched layer can be formed only in necessary portions without distorting the quenched layer.
Further, the heating coil 1 of the present embodiment has the insulating member 6 and the rectangular cylindrical conductor member of the semicircular inductor 9 between the rectangular cylindrical conductor members 2 and 3 of the semicircular inductor 8 constituting the two-turn coil 20. By sandwiching the insulating member 7 between 4 and 5 , the heating section 20a separated for each inner circumference of each turn is formed. By adjusting the width of the insulating members 6 and 7, for example, as shown in FIG. As shown in (2), two quenched layers can be formed at arbitrary positions on the surface of the member to be heated facing the heating section 20a for each inner circumference of each turn.
[0045]
Further, as shown in FIG. 9, the interval between the two-turn coils can be designed so as to avoid the oil hole, and the heat quenching process can be performed while avoiding the oil hole. By enabling the quenching treatment to avoid the oil hole in this way, even if the oil hole is chamfered by about 0.5 to 1.0 mm after the heat quenching treatment, the quenched layer remains Since the holes have not been reached, the occurrence of burning cracks and the like can be avoided.
[0046]
Further, in the heating coil 1 of the present embodiment, after the heating and quenching treatment, the quenching water injected from the quenching water intake ports 21a, 21b, 22a, and 22b of the water cooling jackets 21 and 22 and radiated from the water discharge holes causes the heating section 20a to be heated. The semi-circular inductors 8 and 9 constituting the heating coil and the heating member to be passed through are also cooled, so that the number of times of reusable heating of the coil is reduced from about 50,000 times to about 200,000 times in the related art. The life can be greatly extended.
[0047]
Although the invention made by the present invention has been specifically described based on the embodiments, the present invention is not limited to the above-described embodiments, and it is needless to say that various changes can be made without departing from the gist thereof. Absent. For example, although the heating coil 1 to the two-turn coil structure, electricity substantially square tubular conductor member having a plurality of sets of semicircular so as to form a semi-cylindrical to rectangular tube conductor member in physical contact between One-sided semi-circular inductor with a block-shaped connecting portion provided at both ends in the extending direction of the rectangular tubular conductor member integrated with an insulating member interposed therebetween, so as to form a substantially semi-cylinder. A plurality of sets of rectangular conductor members each having a semicircular arc shape are integrated with an electrical insulating member that physically contacts the rectangular conductor members interposed therebetween. block-shaped connection part corresponding to the connection portion of the semicircular inductor side is provided with the other hand and the other side of the semi-circular heating inductors forming a semicircular arc inductor paired side, the said whereas other relative semicircle center of semicircular portions of the square tube conductor member on the side of the semicircular arc inductor Face arranged semicircular inductor side at the position of 180 degrees, whereas the side of the semi-arcuate inductor connecting portion and the other side of the connection to 3-4 turns and the connection portion of the semicircular inductor ( A coil configuration having a plurality of turns) may be used.
[0048]
In the case of this three- to four-turn coil configuration, it is possible to selectively heat and quench a plurality of places on the surface of the member to be heated.
[0049]
【The invention's effect】
According to the present invention, an arbitrary position on the surface of the member to be heated can be selectively subjected to the heat quenching treatment, and the width direction and the depth direction of the quenched layer can be formed more uniformly and shallower.
[0050]
As a result, the degree of thermal deformation of the member to be heated after the heat quenching treatment can be significantly reduced as compared with the conventional case, and the occurrence of cracks or the like in the oil hole of the member to be heated as in the related art is avoided. In addition, the processing for removing distortion can be omitted.
[0051]
Furthermore, after the heating and quenching treatment, the member to be heated and the semicircular inductor forming the heating part can be simultaneously cooled by the quenching water radiated from the water-cooling jacket, so that the number of times the heating coil can be repeatedly used is increased. Life can be greatly extended.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a state in which each component constituting a heating coil of the present invention is divided.
FIG. 2 is a view showing a two-turn coil formed in the heating coil of FIG. 1;
FIG. 3 is an external perspective view of a state in which a water-cooling jacket is attached to a semicircular inductor forming the heating coil of FIG. 1;
FIG. 4 is a diagram showing a part of the surface of a journal portion of a crankshaft heated on the inner periphery forming the heating unit of FIG. 3;
FIG. 5 is a view showing a cross section of a quenched layer of “A part, B part” of the journal part of FIG. 4;
FIG. 6 is a view showing a cross section of a quenched layer of “C part” of the journal part of FIG. 4;
FIG. 7 is a diagram showing a cross-section of a quenched layer when a heat-hardening process is performed on a thin thick portion where a screw hole is formed.
FIG. 8 is a diagram showing a cross section of a quenched layer of a member to be heated which has been subjected to a heat quenching process so as to face a two-turn inner peripheral heating portion.
FIG. 9 is a diagram showing a cross section of a quenched layer of a member to be heated which has been subjected to a heat quenching process in opposition to a two-turn inner-peripheral heating portion configured in accordance with an oil hole.
FIG. 10 is a view showing a state of a quenching width in a circumferential shape of a member to be heated subjected to heat quenching by a conventional heating coil.
FIG. 11 is a view showing a cross section of the quenched layer in FIG. 10;
FIG. 12 is a view showing a state in which a member to be heated having an oil hole that has been heated and quenched by a conventional heating coil is hardened in a circumferential shape.
FIG. 13 is a diagram showing a heating width of a member to be heated which can be subjected to a heat quenching process by a conventional heating coil.

Claims

A pair of rectangular conductor members having a semicircular arc shape are integrated with an electrical insulating member that physically contacts the rectangular conductor members interposed therebetween, and are provided at both ends in the extending direction of the rectangular conductor members. A component member on one side provided with a block-shaped connection portion ,
A pair of rectangular conductor members having a semicircular arc shape are integrated with an electrical insulating member that physically contacts the rectangular conductor members interposed therebetween, and are provided at both ends in the extending direction of the rectangular conductor members. A block-shaped connection portion corresponding to the connection portion of the one side component member is provided, and the other side component member paired with the one side component member ,
Said one of said other side of the construction member with respect to the semicircle center of semicircular portions of the square tube conductor member on the side of the construction member disposed opposite to the position of 180 degrees, the one wherein the connecting portion on the side of the component A substantially cylindrical two-turn heating inductor is formed by connecting the connecting part of the other component member, and a heating part surrounding the member to be heated is formed on the inner periphery of the two-turn heating inductor,
A high-frequency power source is connected to the square-tube conductor member, and the surface of the member to be heated is heated by high-frequency power supplied from the high-frequency power source to the two-turn heating inductor, and the insulating member sandwiched between the square-tube conductor members A heating inductor characterized in that heating of a surface of a member to be heated is reduced, and a heating depth and a heating width of the surface of the member to be heated are made uniform.

A plurality of sets of rectangular cylindrical conductor members having a semicircular arc shape are formed in such a manner as to form a substantially semi-cylindrical shape with an electrical insulating member physically in contact with the rectangular cylindrical conductor members interposed therebetween, and A component member on one side in which block-shaped connecting portions are provided at both ends in the extending direction of the conductor member ,
A plurality of sets of rectangular cylindrical conductor members having a semicircular arc shape are formed in such a manner as to form a substantially semi-cylindrical shape with an electrical insulating member physically in contact with the rectangular cylindrical conductor members interposed therebetween, and Block-shaped connecting portions corresponding to the connecting portions of the one-sided semicircular arc-shaped heating inductor constituent member are provided at both ends in the extending direction of the conductor member, and the other-side structure forming a pair with the one-side constituent member is provided. And a member ,
Said one of said other side of the construction member with respect to the semicircle center of semicircular portions of the square tube conductor member on the side of the construction member disposed opposite to the position of 180 degrees, the one wherein the connecting portion on the side of the component By forming a substantially cylindrical multi-turn heating inductor by connecting the connection part of the other side of the component, and forming a heating unit surrounding the member to be heated on the inner peripheral portion of the multi-turn heating inductor,
A high-frequency power source is connected to the rectangular cylindrical conductor member, and the high-frequency power supplied to the heating inductor from the high-frequency power source heats the surface of the member to be heated, and the insulating member sandwiched between the rectangular cylindrical conductor members. A heating inductor characterized in that heating of a surface of a member to be heated is reduced, and a heating depth and a heating width of the surface of the member to be heated are made uniform.