JP3813534B2 - Heat treatment method and jig for heat treatment - Google Patents

Heat treatment method and jig for heat treatment Download PDF

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JP3813534B2
JP3813534B2 JP2002122533A JP2002122533A JP3813534B2 JP 3813534 B2 JP3813534 B2 JP 3813534B2 JP 2002122533 A JP2002122533 A JP 2002122533A JP 2002122533 A JP2002122533 A JP 2002122533A JP 3813534 B2 JP3813534 B2 JP 3813534B2
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heat treatment
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JP2003313611A (en
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純一 合屋
公敏 水上
敏弘 相羽
潤 藤江
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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、貫通孔の形成された部材（ワーク）を熱処理する熱処理方法、及びこの熱処理の際に使用される熱処理用治具に関する。
【０００２】
【従来の技術】
従来から、誘導加熱を利用して金属製の被加熱物（ワーク）を加熱して急冷することにより硬化させる高周波焼入れが広く用いられている。この高周波焼入れの対象になるワークの一つとして、一方の面から他方の面まで貫通した孔（貫通孔）の形成された部材が挙げられる。貫通孔の形成された部材では、例えば一方の面のうち貫通孔の周辺部分（若しくは一方の面の全体）が焼入れされることがある。焼入れする際は、周辺部分（若しくは一方の面の全体）を焼入温度まで誘導加熱して急冷する。この場合、この誘導加熱される周辺部分と貫通孔とが形成する角部（貫通孔の出入り口部分の内面及びこの内面に連続する周辺部分の面双方に囲まれた部分）も誘導加熱される。しかし、この角部が焼入温度以上に加熱されるおそれがある。角部の温度が上がり過ぎたときは、この角部が溶解することもある。
【０００３】
【発明が解決しようとする課題】
本発明は、上記事情に鑑み、貫通孔の形成された部材の角部を所定温度に加熱させる熱処理方法及び熱処理用治具を提供することを目的とする。
【０００４】
【課題を解決するための手段】
上記目的を達成するための本発明の第１の熱処理方法は、一方の面から他方の面まで貫通した貫通孔の形成された部材を熱処理する熱処理方法において、
（１）前記一方の面及び前記他方の面双方の面若しくはいずれかの面のうちの少なくとも前記貫通孔の周辺部分を所定温度になるように誘導加熱すると共に、この誘導加熱される周辺部分と前記貫通孔とが形成する角部も前記所定温度になるように誘導加熱することを特徴とするものである。
【０００５】
ここで、
（２）前記角部を前記所定温度になるように誘導加熱する際に、前記角部を冷却しながら前記周辺部分を誘導加熱してもよい。
【０００６】
さらに、
（３）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して前記角部の近傍に配置しておき、
（４）前記角部を冷却しながら前記周辺部分を誘導加熱する際に、前記貫通孔に冷却液を噴射して前記角部を冷却してもよい。
【０００７】
また、上記目的を達成するための本発明の第２の熱処理方法は、一方の面から他方の面まで貫通した貫通孔の形成された部材を水中で熱処理する熱処理方法において、
（５）前記一方の面及び前記他方の面双方の面若しくはいずれかの面のうちの少なくとも前記貫通孔の周辺部分を所定温度に誘導加熱する際に、
（６）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して、該貫通孔と誘導加熱される前記周辺部分とが形成する角部の近傍に前記治具を配置しておくことを特徴とするものである。
【０００８】
また、上記目的を達成するための本発明の第３の熱処理方法は、一方の面から他方の面まで貫通した貫通孔の形成された部材を高周波焼入れする熱処理方法において、
（７）前記一方の面及び前記他方の面双方の面若しくはいずれかの面のうちの少なくとも前記貫通孔の周辺部分を所定の焼入温度になるように誘導加熱すると共に、この誘導加熱される周辺部分と前記貫通孔とが形成する角部も前記所定の焼入温度になるように誘導加熱して焼入れすることを特徴とするものである。
【０００９】
ここで、
（８）前記角部を前記所定の焼入温度になるように誘導加熱する際に、前記角部を冷却しながら前記周辺部分を誘導加熱してもよい。
【００１０】
さらに、
（９）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して前記角部の近傍に配置しておき、
（１０）前記角部を冷却しながら前記周辺部分を誘導加熱する際に、前記貫通孔に冷却液を噴射して前記角部を冷却してもよい。
【００１１】
上記目的を達成するための本発明の第４の熱処理方法は、一方の面から他方の面まで貫通した貫通孔の形成された部材を水中で高周波焼入れする熱処理方法において、
（１１）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して、前記一方の面及び前記他方の面双方の面若しくはいずれかの面のうちの少なくとも前記貫通孔の周辺部分と前記貫通孔とが形成する角部の近傍に前記治具を配置しておき、
（１２）前記周辺部分を所定の焼入温度になるように誘導加熱して焼入れすることを特徴とするものである。
【００１２】
また、上記目的を達成するための本発明の第５の熱処理方法は、内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を熱処理する熱処理方法において、
（１３）前記内壁面及び前記外壁面双方を所定温度になるように誘導加熱すると共に、該内壁面と前記貫通孔とが形成する角部及び前記外壁面と前記貫通孔とが形成する角部双方も前記所定温度になるように誘導加熱することを特徴とするものである。
【００１３】
また、上記目的を達成するための本発明の第６の熱処理方法は、内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を熱処理する熱処理方法において、
（１４）前記内壁面を所定温度になるように誘導加熱すると共に、該内壁面と前記貫通孔とが形成する角部も前記所定温度になるように誘導加熱することを特徴とするものである。
【００１４】
また、上記目的を達成するための本発明の第７の熱処理方法は、内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を熱処理する熱処理方法において、
（１５）前記外壁面を所定温度になるように誘導加熱すると共に、該外壁面と前記貫通孔とが形成する角部も前記所定温度になるように誘導加熱することを特徴とするものである。
【００１５】
ここで、
（１６）前記角部を前記所定温度になるように誘導加熱する際に、前記角部を冷却しながら前記周辺部分を誘導加熱してもよい。
【００１６】
さらに、
（１７）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して前記角部の近傍に配置しておき、
（１８）前記角部を冷却しながら前記周辺部分を誘導加熱する際に、前記貫通孔に冷却液を噴射して前記角部を冷却してもよい。
【００１７】
また、上記目的を達成するための本発明の第８の熱処理方法は、内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で熱処理する熱処理方法において、
（１９）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して、前記内壁面と前記貫通孔とが形成する角部及び前記外壁面と前記貫通孔とが形成する角部双方の近傍に前記治具を配置しておき、
（２０）前記内壁面及び前記外壁面を所定温度に誘導加熱することを特徴とするものである。
【００１８】
また、上記目的を達成するための本発明の第９の熱処理方法は、内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で熱処理する熱処理方法において、
（２１）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して、前記内壁面と前記貫通孔とが形成する角部の近傍に前記治具を配置しておき、
（２２）前記内壁面を所定温度に誘導加熱することを特徴とするものである。
【００１９】
また、上記目的を達成するための本発明の第１０の熱処理方法は、内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で熱処理する熱処理方法において、
（２３）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して、前記外壁面と前記貫通孔とが形成する角部の近傍に前記治具を配置しておき、
（２４）前記外壁面を所定温度に誘導加熱することを特徴とするものである。
【００２０】
また、上記目的を達成するための本発明の第１１の熱処理方法は、内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を高周波焼入れする熱処理方法において、
（２５）前記内壁面及び前記外壁面双方の壁面若しくはいずれかの壁面のうちの少なくとも前記貫通孔の周辺部分を所定の焼入温度になるように誘導加熱すると共に、この誘導加熱される周辺部分と前記貫通孔とが形成する角部も前記所定の焼入温度になるように誘導加熱して焼入れすることを特徴とするものである。
【００２１】
ここで、
（２６）前記角部を前記所定の焼入温度になるように誘導加熱する際に、前記角部を冷却しながら前記周辺部分を誘導加熱してもよい。
【００２２】
さらに、
（２７）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して前記角部の近傍に配置しておき、
（２８）前記角部を冷却しながら前記周辺部分を誘導加熱する際に、前記貫通孔に冷却液を噴射して前記角部を冷却してもよい。
【００２３】
また、上記目的を達成するための本発明の第１２の熱処理方法は、内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で高周波焼入れする熱処理方法において、
（２９）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して、前記内壁面と前記貫通孔とが形成する角部及び前記外壁面と前記貫通孔とが形成する角部双方の近傍に前記治具を配置しておき、
（３０）前記内壁面及び前記外壁面を所定の焼入温度に誘導加熱して焼入れすることを特徴とするものである。
【００２４】
また、上記目的を達成するための本発明の第１３の熱処理方法は、内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で高周波焼入れする熱処理方法において、
（３１）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して、前記内壁面と前記貫通孔とが形成する角部の近傍に前記治具を配置しておき、
（３２）前記内壁面を所定の焼入温度に誘導加熱して焼入れすることを特徴とするものである。
【００２５】
また、上記目的を達成するための本発明の第１４の熱処理方法は、内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で高周波焼入れする熱処理方法において、
（３３）前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して、前記外壁面と前記貫通孔とが形成する角部の近傍に前記治具を配置しておき、
（３４）前記外壁面を所定の焼入温度に誘導加熱することを特徴とするものである。
【００２６】
また、上記目的を達成するための本発明の第１の熱処理用治具は、一方の面から他方の面まで貫通した貫通孔の形成された部材を熱処理する際に使用される熱処理用治具において、
（３５）前記貫通孔の内径よりも小さい外径を有すると共に、該貫通孔の内面に接触しないように該貫通孔に挿入される棒状部を備えたことを特徴とするものである。
【００２７】
また、上記目的を達成するための本発明の第２の熱処理用治具は、内壁面から外壁面まで貫通した貫通孔が形成された円筒状部材を熱処理する際に使用される熱処理用治具において、
（３６）前記貫通孔の内径よりも小さい外径を有する棒状部と、
（３７）該棒状部が前記貫通孔の内面に接触しないように該貫通孔内に該棒状部を保持しておく保持部とを備えたことを特徴とするものである。
【００２８】
【発明の実施の形態】
図面を参照して本発明の実施形態を説明する。
［第１実施形態］
【００２９】
図１と図２を参照して、本発明の第１実施形態を説明する。
【００３０】
図１は、大気中で高周波焼入れされる平板と熱処理用治具を示す斜視図である。図２は、図１の熱処理用治具の棒状部が貫通孔に差し込まれた平板を示す断面図である。
【００３１】
平板１０（本発明にいう、貫通孔の形成された部材の一例である。）には、一方の面１２から他方の面１４まで貫通した貫通孔１６が形成されている。ここでは、一方の面１２を高周波焼入れする場合について説明する。一方の面１２を高周波焼入れする際に使用される熱処理用治具２０（本発明にいう治具の一例である）は、貫通孔１６に挿入される棒状部２２と、この棒状部２２を保持する保持部２４とを有する。
【００３２】
棒状部２２は、貫通孔１６の内径よりも小さい外径を有する。保持部２４は、棒状部２２の根元から棒状部２２にほぼ直交して広がっており、貫通孔１６に挿入された棒状部２２を貫通孔１６の内面に接触させないように保持するものである。保持部２４の長手方向両端部には、弾力性（ばね性）のある一対の保持爪２４ａが形成されており、この一対の保持爪２４ａで平板１０の両側面１８ａ，１８ｂを挟み込む。これにより、熱処理用治具２０が平板１０に固定されると共に、棒状部２２が貫通孔１６の内面に接触しないように保持される。また、保持部２４のうち棒状部２２との接続部分の近傍部分には、冷却液３２を通すための孔２４ｂが形成されている。
【００３３】
なお、一対の保持爪２４ａが平板の上面１９ａと下面１９ｂを挟み込むように構成してもよい。さらに、平板１０の両側面１８ａ，１８ｂ及び上面１９ａと下面１９ｂ双方を挟み込む２組の一対の保持爪を熱処理用治具２０に形成してもよい。
【００３４】
上記した例では、貫通孔１６を円柱状のもの（横断面が円形のもの）としたが、三角形や四角形などの角柱状の貫通孔（横断面が三角形や四角形など）であってもよい。この場合、棒状部２２は、貫通孔１６の形状に合わせて三角形や四角形などの角柱状のものとなる。
【００３５】
上記した熱処理用治具２０を用いて、平板１０の一方の面１２を高周波焼入れする熱処理方法を説明する。
【００３６】
平板１０をほぼ水平に配置し、熱処理用治具２０の棒状部２２を上方から（他方の面１４の側から）貫通孔１６に差し込むと共に平板１０の両側面１８ａ，１８ｂを一対の保持爪２４ａで挟んで熱処理用治具２０を平板１０に固定する。これにより、図２に示すように、棒状部２２が貫通孔１６に接触しないように配置される。この場合、貫通孔１６と棒状部２２との隙間ｔは約０．５ｍｍになる。
【００３７】
上記のような状態で、平板１０の一方の面１２に誘導加熱コイル３０を接近させてこの面１２を所定の焼入温度に誘導加熱すると共に、上方から（他方の面１４の側から）貫通孔１６に冷却液３２を噴射する。噴射された冷却液３２は孔２４ｂなどを通って隙間ｔを通過して面１２の側から落下する。この冷却液３２によって、面１２と貫通孔１６とが形成する角部１１が適宜に冷却される。この結果、角部１１も面１２と同じ焼入温度になり、角部１１がこの焼入温度以上に誘導加熱されない。従って、角部１１が溶解することはない。
【００３８】
なお、冷却液３２はほぼ真下に落下するので、誘導加熱中の面１２（本発明にいう周辺部分の一例である）には冷却液３２がほとんど接触せず、この面１２は冷却液３２によって冷却されない。従って、面１２と角部１１は共に適切な焼入温度に誘導加熱される。面１２と角部１１が適切な焼入温度に加熱された後、下方から面１２に向けて冷却液を噴射することにより、面１２と角部１１には硬化層が形成される。下方から面１２に向けて冷却液を噴射する際は、他方の面１４の上方からも冷却液３２を噴射させたままにしておく。
【００３９】
一方の面１２及び他方の面１４双方を焼入れするときは、上述した方法で面１２を焼入れした後、面１４が上を向くように平板１０を反して上記の方法で面１４を焼入れする。また、上記の例では、焼入れについて説明したが、上記の熱処理方法は焼なましや焼戻しにも適用できる。この場合は、上述のように角部１１を冷却しながら面１２を所定の焼なまし温度や焼戻温度に加熱する。この結果、面１２と角部１１が所定の焼なまし温度や焼戻温度に加熱されることとなる。また、平板１０に限定されず、例えば湾曲した板などにも上記の熱処理方法を適用できる。
［第２実施形態］
【００４０】
図３を参照して、本発明の第２実施形態を説明する。
【００４１】
図３は、水中で高周波焼入れされる平板と熱処理用治具を示す断面図である。図３では、図１と図２に示された構成要素と同一の構成要素には同一の符号が付されている。
【００４２】
平板１０の一方の面１２を水中で高周波焼入れする場合について説明する。この高周波焼入れの際に使用される熱処理用治具２０は、第１実施形態の熱処理用治具２０と同じものである。
【００４３】
熱処理用治具２０の棒状部２２を他方の面１４の側から貫通孔１６に挿入し、熱処理用治具２０の一対の保持爪２４ａで平板１０の両側面１８ａ，１８ｂを挟み込んで、熱処理用治具２０を平板１０に固定させる。この場合、第１実施形態と同様に、貫通孔１６と棒状部２２との隙間ｔを約０．５ｍｍに保ち、棒状部２２を貫通孔１６に接触させない。熱処理用治具２０が固定された平板１０を容器３０の載置台３３に固定する。容器３０には水３４が満たされている。
【００４４】
上記のような状態で、平板１０の一方の面１２に誘導加熱コイル４０を接近させておき、この誘導加熱コイル４０に適切な高周波電力を供給することにより面１２を所定の焼入温度に誘導加熱する。この誘導加熱によって角部１１も加熱される。しかし、貫通孔１６と棒状部２２との隙間ｔには水３４が満たされており、この満たされた適宜の量の水３４によって角部１１が冷却されるので角部１１が所定の焼入温度以上に加熱されることはない。従って、角部１１が溶解することはない。なお、熱処理用治具２０を使用しないときは、貫通孔１６の全てが水３４で満たされることとなり、角部１１が冷却され過ぎる。このため、面１２が所定の焼入温度に達しても、角部１１が所定の焼入温度に達しない。従って、上記した隙間ｔは、角部１１が所定の焼入温度になるように設定される。
【００４５】
上述のようにして面１２と角部１１を所定の焼入温度に誘導加熱した後、誘導加熱コイル４０に供給している高周波電力を停止する。面１２と角部１１は水３４に接触しているので急冷されることとなり、面１２と角部１１には硬化層が形成される。
【００４６】
なお、一方の面１２及び他方の面１４双方を焼入れするときは、上述した方法で面１２を焼入れした後、熱処理用治具２０の棒状部２２を一方の面１２の側から挿入し、熱処理用治具２０の一対の保持爪２４ａで平板１０の両側面１８ａ，１８ｂを挟み込んで、熱処理用治具２０を平板１０に固定させる。その後は、面１２を焼入れする手順と同様である。また、面１２と面１４を同時に焼入れするときは、棒状部２２以外の部分ができるだけ小さい熱処理用治具を使用して、棒状部２２を貫通孔１６に挿入しておき、面１２と面１４を同時に加熱する。
【００４７】
上記の例では、焼入れについて説明したが、上記の熱処理方法は焼なましや焼戻しにも適用できる。この場合は、上述のように角部１１を冷却しながら面１２を所定の焼なまし温度や焼戻温度に加熱する。この結果、面１２と角部１１が所定の焼なまし温度や焼戻温度に加熱されることとなる。また、平板１０に限定されず、例えば湾曲した板などにも上記の熱処理方法を適用できる。
［第３実施形態］
【００４８】
図４と図５を参照して、本発明の第３実施形態を説明する。
【００４９】
図４は、大気中で高周波焼入れされる円筒状部材と熱処理用治具を示す斜視図である。図５は、図４の熱処理用治具の棒状部が貫通孔に差し込まれた円筒状部材を示す断面図である。
【００５０】
円筒状部材５０には、内壁面５２から外壁面５４まで貫通した２つの貫通孔５６が形成されている。ここでは、円筒状部材５０の内壁面５２を高周波焼入れする場合について説明する。内壁面５２を高周波焼入れする際に使用される熱処理用治具６０（本発明にいう治具の一例である）は、貫通孔５６に挿入される棒状部６２と、この棒状部６２を保持する保持部６４とを有する。
【００５１】
棒状部６２は、貫通孔５６の内径よりも小さい外径を有する。保持部６４は、棒状部６２の根元から棒状部６２にほぼ直交して広がっており、貫通孔５６に挿入された棒状部６２を貫通孔５６の内面に接触させないように保持するものである。保持部６４には弾力性（ばね性）のある一対の保持爪６４ａが形成されており、この一対の保持爪６４ａで円筒状部材５０の外壁面５４を挟み込む。これにより、熱処理用治具６０が円筒状部材５０に固定されると共に、棒状部６２が貫通孔５６の内面に接触しないように保持される。また、保持部６４のうち棒状部６２との接続部分の近傍部分には、冷却液３２を通すための孔６４ｂが形成されている。
【００５２】
上記した例では、貫通孔５６を円柱状のもの（横断面が円形のもの）としたが、三角形や四角形などの角柱状の貫通孔（横断面が三角形や四角形など）であってもよい。この場合、棒状部６２は、貫通孔５６の形状に合わせて三角形や四角形などの角柱状のものとなる。
【００５３】
上記した熱処理用治具６０を用いて、円筒状部材５０の内壁面５２を高周波焼入れする熱処理方法を説明する。
【００５４】
円筒状部材５０を立てて配置し、熱処理用治具６０の棒状部６２を外壁面５４の側から貫通孔５６に差し込むと共に一対の保持爪６４ａで円筒状部材５０の外壁面５４を挟み込んで熱処理用治具６０を円筒状部材５０に固定する。これにより、図５に示すように、棒状部６２が貫通孔５６に接触しないように配置される。この場合、貫通孔５６と棒状部６２との隙間ｔは約０．５ｍｍになる。
【００５５】
上記のような状態で、円筒状部材５０の中空部に誘導加熱コイル７０（冷却液を噴射する冷却ジャケットを兼ねている）を挿入して、内壁面５２に誘導加熱コイル７０を接近させる。この状態で誘導加熱コイル７０に適宜の高周波電力を供給して内壁面５２を所定の焼入温度に誘導加熱すると共に、外壁面５４の側から貫通孔５６に冷却液３２を噴射する。この冷却液３２が孔６４ｂなどを通って貫通孔５６に浸入して、内壁面５２と貫通孔５６とが形成する角部５８が適宜に冷却される。この結果、角部５８も内壁面５２と同じ焼入温度になり、角部５８がこの焼入温度以上に誘導加熱されない。従って、角部５８が溶解することはない。従って、内壁面５２と角部５８は共に適切な焼入温度に誘導加熱される。内壁面５２と角部５８が適切な焼入温度に加熱された後、誘導加熱コイル７０から内壁面５２に向けて冷却液を噴射することにより、内壁面５２と角部５８には硬化層が形成される。誘導加熱コイル７０から内壁面５２に向けて冷却液を噴射する際には、外壁面５４の側から貫通孔５６に冷却液３２を噴射したままにしておく。
【００５６】
上記の例では、焼入れについて説明したが、上記の熱処理方法は焼なましや焼戻しにも適用できる。この場合は、上述のように角部５８を冷却しながら内壁面５２を所定の焼なまし温度や焼戻温度に加熱する。この結果、内壁面５２と角部５８が所定の焼なまし温度や焼戻温度に加熱されることとなる。また、円筒状部材５０に限定されず、例えば角柱などにも上記の熱処理方法を適用できる。
［第４実施形態］
【００５７】
図６を参照して、本発明の第４実施形態を説明する。
【００５８】
図６は、水中で高周波焼入れされる円筒状部材と熱処理用治具を示す断面図である。図６では、図４と図５に示された構成要素と同一の構成要素には同一の符号が付されている。
【００５９】
円筒状部材５０の内壁面５２を水中で高周波焼入れする場合について説明する。この高周波焼入れの際に使用される熱処理用治具６０は、第３実施形態の熱処理用治具６０と同じものである。
【００６０】
熱処理用治具６０の棒状部６２を外壁面５４の側から挿入し、熱処理用治具６０の一対の保持爪６４ａで円筒状部材５０の外壁面５４を挟み込んで、熱処理用治具６０を円筒状部材５０に固定させる。この場合、第３施形態と同様に、貫通孔５６と棒状部６２との隙間ｔを約０．５ｍｍに保ち、棒状部６２を貫通孔５６に接触させない。熱処理用治具６０が固定された円筒状部材５０を容器３０の載置台３３に固定する。容器３０には水３４が満たされている。
【００６１】
上記のような状態で、円筒状部材５０の内壁面５２に誘導加熱コイル８０を接近させておき、この誘導加熱コイル８０に適切な高周波電力を供給することにより内壁面５２を所定の焼入温度に誘導加熱する。この誘導加熱によって角部５８も加熱される。しかし、貫通孔５６と棒状部６２との隙間ｔには水３４が満たされており、この満たされた適宜の量の水３４によって角部５８が冷却されるので角部５８が所定の焼入温度以上に加熱されることはない。従って、角部５８が溶解することはない。なお、熱処理用治具６０を使用しないときは、貫通孔５６の全てが水３４で満たされることとなり、角部５８が冷却され過ぎる。このため、内壁面５２が所定の焼入温度に達しても、角部５８が所定の焼入温度に達しない。従って、上記した隙間ｔは、角部５８が所定の焼入温度になるように設定される。
【００６２】
上述のようにして内壁面５２と角部５８を所定の焼入温度に誘導加熱した後、誘導加熱コイル８０に供給している高周波電力を停止する。内壁面５２と角部５８は水３４に接触しているので急冷されることとなり、内壁面５２と角部５８には硬化層が形成される。
【００６３】
なお、上記の例では、焼入れについて説明したが、上記の熱処理方法は焼なましや焼戻しにも適用できる。この場合は、上述のように角部５８を冷却しながら内壁面５２を所定の焼なまし温度や焼戻温度に加熱する。この結果、内壁面５２と角部５８が所定の焼なまし温度や焼戻温度に加熱されることとなる。
［第５実施形態］
【００６４】
図７と図８を参照して、本発明の第５実施形態を説明する。
【００６５】
図７は、大気中で高周波焼入れされる円筒状部材と熱処理用治具を示す斜視図である。図８は、図７の熱処理用治具の棒状部が貫通孔に差し込まれた円筒状部材を示す断面図である。これらの図では、図４と図５に示された構成要素と同一の構成要素には同一の符号が付されている。
【００６６】
ここでは、円筒状部材５０の外壁面５４を高周波焼入れする場合について説明する。外壁面５４を高周波焼入れする際に使用される熱処理用治具９０（本発明にいう治具の一例である）は、貫通孔５６に挿入される棒状部９２と、この棒状部９２を保持する保持部９４とを有する。
【００６７】
棒状部９２は、貫通孔５６の内径よりも小さい外径を有する。保持部９４は、貫通孔５６に挿入された棒状部９２を貫通孔５６の内面に接触させないように保持するものである。保持部９４には弾力性（ばね性）のある一対の保持爪９４ａが形成されており、この一対の保持爪９４ａで円筒状部材５０の上端面５０ａと下端面５０ｂを挟み込む。これにより、熱処理用治具９０が円筒状部材５０に固定されると共に、棒状部９２が貫通孔５６の内面に接触しないように保持される。
【００６８】
上記した例では、貫通孔５６を円柱状のもの（横断面が円形のもの）としたが、三角形や四角形などの角柱状の貫通孔（横断面が三角形や四角形など）であってもよい。この場合、棒状部９２は、貫通孔５６の形状に合わせて三角形や四角形などの角柱状のものとなる。
【００６９】
上記した熱処理用治具９０を用いて、円筒状部材５０の外壁面５４を高周波焼入れする熱処理方法を説明する。
【００７０】
円筒状部材５０を立てて配置し、熱処理用治具９０の棒状部９２を内壁面５２の側から貫通孔５６に差し込むと共に一対の保持爪９４ａで円筒状部材５０の上端面５０ａと下端面５０ｂを挟み込んで熱処理用治具９０を円筒状部材５０に固定する。これにより、図８に示すように、棒状部９２が貫通孔５６に接触しないように配置される。この場合、貫通孔５６と棒状部９２との隙間ｔは約０．５ｍｍになる。
【００７１】
上記のような状態で、円筒状部材５０の中空部に冷却ジャケット１００を挿入すると共に、外壁面５４に誘導加熱コイル（冷却液を噴射する冷却ジャケットを兼ねる）１１０を接近させる。誘導加熱コイル１１０に高周波電力を供給して外壁面５４を所定の焼入温度に誘導加熱すると共に、冷却ジャケット１００から冷却液１０２を内壁面５２を噴射する。この冷却液１０２は貫通孔５６に浸入して、外壁面５４と貫通孔５６とが形成する角部５９が冷却されるので、角部５９も外壁面５４と同じ焼入温度になり、角部５９がこの焼入温度以上に誘導加熱されない。このため、角部５９が溶解することはない。従って、外壁面５４と角部５９は共に適切な焼入温度に誘導加熱される。なお、保持部９４の形状は、冷却ジャケット１００から噴射された冷却液１０２が貫通孔５６に浸入することを妨げない形状である。
【００７２】
外壁面５４と角部５９が適切な焼入温度に加熱された後、誘導加熱コイル１１０から外壁面５４に向けて冷却液を噴射することにより、外壁面５４と角部５９には硬化層が形成される。誘導加熱コイル１１０から外壁面５４に向けて冷却液を噴射する際には、冷却ジャケット１００から内壁面５２に冷却液１０２を噴射したままにする。
【００７３】
上記の例では、焼入れについて説明したが、上記の熱処理方法は焼なましや焼戻しにも適用できる。この場合は、上述のように角部５９を冷却しながら外壁面５４を所定の焼なまし温度や焼戻温度に加熱する。この結果、外壁面５４と角部５９は所定の焼なまし温度や焼戻温度に加熱されることとなる。また、円筒状部材５０に限定されず、例えば角柱などにも上記の熱処理方法を適用できる。
［第６実施形態］
【００７４】
図９を参照して、本発明の第６実施形態を説明する。
【００７５】
図９は、水中で高周波焼入れされる円筒状部材と熱処理用治具を示す断面図である。図９では、図７と図８に示された構成要素と同一の構成要素には同一の符号が付されている。
【００７６】
円筒状部材５０の外壁面５４を水中で高周波焼入れする場合について説明する。この高周波焼入れの際に使用される熱処理用治具９０は、第５実施形態の熱処理用治具９０と同じものである。
【００７７】
熱処理用治具９０の棒状部９２を内壁面５２の側から貫通孔５６に挿入し、熱処理用治具９０の一対の保持爪９４ａで円筒状部材５０の上端面５０ａと下端面５０ｂを挟み込んで熱処理用治具９０を円筒状部材５０に固定させる。この場合、第５実施形態と同様に、貫通孔５６と棒状部９２との隙間ｔを約０．５ｍｍに保ち、棒状部９２を貫通孔５６に接触させない。熱処理用治具９０が固定された円筒状部材５０を容器３０の載置台３３に固定する。容器３０には水３４が満たされている。
【００７８】
上記のような状態で、円筒状部材５０の外壁面５４に誘導加熱コイル１１０を接近させておき、この誘導加熱コイル１１０に適切な高周波電力を供給することにより外壁面５４を所定の焼入温度に誘導加熱する。この誘導加熱によって角部５９も加熱される。しかし、貫通孔５６と棒状部９２との隙間ｔには水３４が満たされており、この満たされた適宜の量の水３４によって角部５９が冷却されるので角部５９が所定の焼入温度以上に加熱されることはない。従って、角部５９が溶解することはない。なお、熱処理用治具９０を使用しないときは、貫通孔５６の全てが水３４で満たされることとなり、角部５９が冷却され過ぎる。このため、外壁面５４が所定の焼入温度に達しても、角部５９が所定の焼入温度に達しない。従って、上記した隙間ｔは、角部５９が所定の焼入温度になるように設定される。
【００７９】
上述のようにして外壁面５４と角部５９を所定の焼入温度に誘導加熱した後、誘導加熱コイル１１０に供給している高周波電力を停止する。外壁面５４と角部５９は水３４に接触しているので急冷されることとなり、外壁面５４と角部５９には硬化層が形成される。
【００８０】
なお、上記の例では、焼入れについて説明したが、上記の熱処理方法は焼なましや焼戻しにも適用できる。この場合は、上述のように角部５９を冷却しながら外壁面５４を所定の焼なまし温度や焼戻温度に加熱する。この結果、外壁面５４と角部５９が所定の焼なまし温度や焼戻温度に加熱されることとなる。
【００８１】
また、上記した各実施形態では、貫通孔に棒状部を挿入して貫通孔と棒状部との間に隙間を形成させ、この隙間に冷却液を浸入させることにより、角部を冷却したが、角部や貫通孔内面にパイプを接触させて、このパイプに冷却液を流すことにより角部を冷却してもよい。この場合、パイプに流す冷却液の温度を適宜に調節することにより、角部が冷却される温度を適宜に調節できる。
【００８２】
【発明の効果】
以上説明したように本発明の第１の熱処理方法によれば、誘導加熱される周辺部分と同じ所定温度になるように角部が誘導加熱される。従って、この角部が所定温度以上に誘導加熱されることは無い。
【００８３】
ここで、前記角部を前記所定温度になるように誘導加熱する際に、前記角部を冷却しながら前記周辺部分を誘導加熱する場合は、角部が所定温度になるように容易に誘導加熱できる。
【００８４】
さらに、前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して前記角部の近傍に配置しておき、前記角部を冷却しながら前記周辺部分を誘導加熱する際に、前記貫通孔に冷却液を噴射して前記角部を冷却する場合は、誘導加熱中に貫通孔と治具の隙間に浸入した冷却液が角部を冷却するので、角部の温度が適宜に冷却されてその温度が上昇しにくい。従って、貫通孔の周辺部分と同じ所定温度になるように角部が誘導加熱される。この結果、角部が所定温度以上に誘導加熱されて溶解することは無い。
【００８５】
また、本発明の第２の熱処理方法によれば、治具と貫通孔の隙間に水が浸入するので、角部の温度が適宜に冷却されてその温度が上昇しにくい。従って、貫通孔の周辺部分と同じ所定温度になるように角部が誘導加熱される。この結果、角部が所定温度以上に誘導加熱されて溶解することは無い。
【００８６】
また、本発明の第３の熱処理方法によれば、貫通孔の周辺部分と同じ所定の焼入温度になるように角部が誘導加熱される。従って、この角部が所定の焼入温度以上に誘導加熱されることは無い。
【００８７】
ここで、前記角部を前記所定の焼入温度になるように誘導加熱する際に、前記角部を冷却しながら前記周辺部分を誘導加熱する場合は、角部が所定の焼入温度になるように容易に誘導加熱できる。
【００８８】
さらに、前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して前記角部の近傍に配置しておき、前記角部を冷却しながら前記周辺部分を誘導加熱する際に、前記貫通孔に冷却液を噴射して前記角部を冷却する場合は、貫通孔と治具の隙間に浸入した冷却液が角部を冷却するので、角部の温度が適宜に冷却されてその温度が上昇しにくい。従って、貫通孔の周辺部分と同じ所定温度になるように角部が誘導加熱される。この結果、角部が所定温度以上に誘導加熱されて溶解することは無い。
【００８９】
また、本発明の第４の熱処理方法によれば、治具と貫通孔の隙間に水が浸入するので、角部の温度が適宜に冷却されてその温度が上昇しにくい。従って、貫通孔の周辺部分と同じ所定温度になるように角部が誘導加熱される。この結果、角部が所定温度以上に誘導加熱されて溶解することは無い。
【００９０】
また、本発明の第５の熱処理方法によれば、内壁面及び外壁面双方と同じ所定温度になるように２つの角部が誘導加熱される。従って、この角部が所定温度以上に誘導加熱されることは無い。
【００９１】
また、本発明の第６の熱処理方法によれば、内壁面と同じ所定温度になるように角部が誘導加熱される。従って、この角部が所定温度以上に誘導加熱されることは無い。
【００９２】
また、本発明の第７の熱処理方法によれば、外壁面と同じ所定温度になるように角部が誘導加熱される。従って、この角部が所定温度以上に誘導加熱されることは無い。
【００９３】
ここで、前記角部を前記所定温度になるように誘導加熱する際に、前記角部を冷却しながら前記周辺部分を誘導加熱する場合は、角部が所定温度になるように容易に誘導加熱できる。
【００９４】
さらに、前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して前記角部の近傍に配置しておき、前記角部を冷却しながら前記周辺部分を誘導加熱する際に、前記貫通孔に冷却液を噴射して前記角部を冷却する場合は、貫通孔と治具の隙間に浸入した冷却液が角部を冷却するので、角部を容易に冷却できる。
【００９５】
また、本発明の第８の熱処理方法によれば、治具と貫通孔の隙間に水が浸入するので、角部の温度が適宜に冷却されてその温度が上昇しにくい。従って、内壁面及び外壁面と同じ所定温度になるように角部が誘導加熱される。この結果、角部が所定温度以上に誘導加熱されて溶解することは無い。
【００９６】
また、本発明の第９の熱処理方法によれば、治具と貫通孔の隙間に水が浸入するので、角部の温度が適宜に冷却されてその温度が上昇しにくい。従って、内壁面と同じ所定温度になるように角部が誘導加熱される。この結果、角部が所定温度以上に誘導加熱されて溶解することは無い。
【００９７】
また、本発明の第１０の熱処理方法によれば、治具と貫通孔の隙間に水が浸入するので、角部の温度が適宜に冷却されてその温度が上昇しにくい。従って、外壁面と同じ所定温度になるように角部が誘導加熱される。この結果、角部が所定温度以上に誘導加熱されて溶解することは無い。
【００９８】
また、本発明の第１１の熱処理方法によれば、貫通孔の周辺部分と同じ所定の焼入温度になるように角部が誘導加熱される。従って、この角部が所定の焼入温度以上に誘導加熱されることは無い。
【００９９】
ここで、前記角部を前記所定の焼入温度になるように誘導加熱する際に、前記角部を冷却しながら前記周辺部分を誘導加熱する場合は、角部が所定の焼入温度になるように容易に誘導加熱できる。
【０１００】
さらに、前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入して前記角部の近傍に配置しておき、前記角部を冷却する際に、前記貫通孔に冷却液を噴射して前記角部を冷却する場合は、貫通孔と治具の隙間に浸入した冷却液が角部を冷却するので、角部を容易に冷却できる。
【０１０１】
また、本発明の第１２の熱処理方法によれば、治具と貫通孔の隙間に水が浸入するので、角部の温度が適宜に冷却されてその温度が上昇しにくい。従って、内壁面及び外壁面と焼入温度になるように角部が誘導加熱される。この結果、角部が焼入温度以上に誘導加熱されて溶解することは無い。
【０１０２】
また、本発明の第１３の熱処理方法によれば、治具と貫通孔の隙間に水が浸入するので、角部の温度が適宜に冷却されてその温度が上昇しにくい。従って、内壁面と同じ焼入温度になるように角部が誘導加熱される。この結果、角部が焼入温度以上に誘導加熱されて溶解することは無い。
【０１０３】
また、本発明の第１４の熱処理方法によれば、治具と貫通孔の隙間に水が浸入するので、角部の温度が適宜に冷却されてその温度が上昇しにくい。従って、外壁面と同じ焼入温度になるように角部が誘導加熱される。この結果、角部が焼入温度以上に誘導加熱されて溶解することは無い。
【０１０４】
また、本発明の第１の熱処理用治具を用いて、貫通孔の形成された部材を熱処理する際には、熱処理用治具の棒状部を貫通孔の内面に接触しないように貫通孔に挿入する。このため、棒状部と貫通孔の内面との間には隙間（空間）が形成される。上記の部材の一方の面及び他方の面双方の面若しくはいずれかの面のうち少なくとも貫通孔の周辺部分を所定温度になるように誘導加熱する際は、貫通孔に冷却液を噴射する。棒状部の外径を変えることにより、隙間を通過する冷却液の液量を調整できる。この冷却液は、棒状部と貫通孔の内面の隙間を通過するので、上記の周辺部分と貫通孔が形成する角部が冷却される。この結果、貫通孔の周辺部分と同じ温度になるように角部が誘導加熱される。従って、この角部が必要以上の温度に誘導加熱されることは無い。
【０１０５】
また、本発明の第２の熱処理用治具を用いて、貫通孔の形成された円筒状部材を熱処理する際には、熱処理用治具の棒状部が貫通孔の内面に接触しないように保持部で保持される。このため、棒状部と貫通孔の内面との間には隙間（空間）が形成されたままになる。円筒状部材の内壁面及び外壁面双方の面若しくはいずれかの面のうち少なくとも貫通孔の周辺部分を所定温度になるように誘導加熱する際は、貫通孔に冷却液を噴射する。棒状部の外径を変えることにより、隙間を通過する冷却液の液量を調整できる。この冷却液は、棒状部と貫通孔の内面の隙間を通過するので、上記の周辺部分と貫通孔が形成する角部が冷却される。この結果、貫通孔の周辺部分と同じ温度になるように角部が誘導加熱される。従って、この角部が必要以上の温度に誘導加熱されることは無い。
【図面の簡単な説明】
【図１】大気中で高周波焼入れされる平板と熱処理用治具を示す斜視図である。
【図２】図１の熱処理用治具の棒状部が貫通孔に差し込まれた平板を示す断面図である。
【図３】水中で高周波焼入れされる平板と熱処理用治具を示す断面図である。
【図４】大気中で高周波焼入れされる円筒状部材と熱処理用治具を示す斜視図である。
【図５】図４の熱処理用治具の棒状部が貫通孔に差し込まれた円筒状部材を示す断面図である。
【図６】水中で高周波焼入れされる円筒状部材と熱処理用治具を示す断面図である。
【図７】大気中で高周波焼入れされる円筒状部材と熱処理用治具を示す斜視図である。
【図８】図７の熱処理用治具の棒状部が貫通孔に差し込まれた円筒状部材を示す断面図である。
【図９】水中で高周波焼入れされる円筒状部材と熱処理用治具を示す断面図である。
【符号の説明】
１０ 平板
１１，５８，５９ 角部
１２ 平板の一方の面
１４ 平板の他方の面
１６，５６ 貫通孔
２０，６０，９０ 熱処理用治具
２２，６２，９２ 棒状部
２４，６４，９４ 保持部
５０ 円筒状部材
５２ 内壁面
５４ 外壁面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat treatment method for heat-treating a member (workpiece) in which a through hole is formed, and a heat treatment jig used in the heat treatment.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, induction hardening is widely used in which a metal object to be heated (workpiece) is heated and rapidly cooled by induction heating to be cured. One of the workpieces subjected to induction hardening is a member in which a hole (through hole) penetrating from one surface to the other surface is formed. In the member in which the through hole is formed, for example, the peripheral portion of the through hole (or the entire one surface) of one surface may be quenched. When quenching, the peripheral portion (or the whole of one side) is rapidly cooled by induction heating to the quenching temperature. In this case, the corner portion formed by the peripheral portion to be induction-heated and the through-hole (the portion surrounded by both the inner surface of the entrance / exit portion of the through-hole and the peripheral portion continuous with the inner surface) is also induction-heated. However, this corner may be heated to a temperature higher than the quenching temperature. When the temperature of the corner is too high, the corner may be dissolved.
[0003]
[Problems to be solved by the invention]
An object of this invention is to provide the heat processing method and the jig for heat processing which heat the corner | angular part of the member in which the through-hole was formed to predetermined temperature in view of the said situation.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a first heat treatment method of the present invention is a heat treatment method for heat-treating a member in which a through hole penetrating from one surface to the other surface is formed.
(1) Inductively heating at least a peripheral part of the through hole of both the one surface and the other surface or any one of the surfaces to a predetermined temperature, and the induction heated peripheral portion; The corner formed by the through hole is also induction-heated so as to reach the predetermined temperature.
[0005]
here,
(2) When the corner portion is induction-heated to the predetermined temperature, the peripheral portion may be induction-heated while the corner portion is cooled.
[0006]
further,
(3) A jig having an outer diameter smaller than the inner diameter of the through hole is inserted into the through hole so as not to contact the inner surface of the through hole, and is arranged in the vicinity of the corner portion,
(4) When the peripheral portion is induction-heated while cooling the corner portion, the corner portion may be cooled by jetting a coolant into the through hole.
[0007]
Moreover, the second heat treatment method of the present invention for achieving the above object is a heat treatment method in which a member in which a through hole penetrating from one surface to the other surface is heat treated in water,
(5) When induction heating at least a peripheral part of the through hole to a predetermined temperature of both the one surface and the other surface or any one of the surfaces,
(6) A jig having an outer diameter smaller than the inner diameter of the through hole is inserted into the through hole so as not to contact the inner surface of the through hole, and the through hole and the peripheral portion to be induction-heated are formed. The jig is arranged in the vicinity of the corner portion.
[0008]
In addition, a third heat treatment method of the present invention for achieving the above object is a heat treatment method in which a member formed with a through hole penetrating from one surface to the other surface is induction-hardened.
(7) Inductively heat at least the peripheral portion of the through hole of both the one surface and the other surface or any one of the surfaces so as to have a predetermined quenching temperature, and the induction heating is performed. The corner portion formed by the peripheral portion and the through hole is also hardened by induction heating so that the predetermined quenching temperature is reached.
[0009]
here,
(8) When the corner portion is induction-heated so as to reach the predetermined quenching temperature, the peripheral portion may be induction-heated while the corner portion is cooled.
[0010]
further,
(9) A jig having an outer diameter smaller than the inner diameter of the through-hole is inserted into the through-hole so as not to contact the inner surface of the through-hole, and is arranged in the vicinity of the corner.
(10) When the peripheral portion is induction-heated while cooling the corner portion, the corner portion may be cooled by spraying a coolant to the through hole.
[0011]
In order to achieve the above object, a fourth heat treatment method of the present invention is a heat treatment method in which a member formed with a through hole penetrating from one surface to the other surface is induction-quenched in water.
(11) Insert a jig having an outer diameter smaller than the inner diameter of the through-hole into the through-hole so as not to contact the inner surface of the through-hole, and either or both of the one surface and the other surface The jig is arranged in the vicinity of a corner formed by at least a peripheral portion of the through hole and the through hole in the surface of
(12) The peripheral portion is quenched by induction heating so as to have a predetermined quenching temperature.
[0012]
Further, a fifth heat treatment method of the present invention for achieving the above object is a heat treatment method for heat-treating a cylindrical member having a through hole penetrating from an inner wall surface to an outer wall surface.
(13) Inductively heating both the inner wall surface and the outer wall surface to a predetermined temperature, and a corner portion formed by the inner wall surface and the through hole and a corner portion formed by the outer wall surface and the through hole. Both are characterized by induction heating so that the predetermined temperature is reached.
[0013]
Further, a sixth heat treatment method of the present invention for achieving the above object is a heat treatment method for heat treating a cylindrical member in which a through-hole penetrating from an inner wall surface to an outer wall surface is formed.
(14) The inner wall surface is induction-heated to a predetermined temperature, and a corner portion formed by the inner wall surface and the through hole is induction-heated to the predetermined temperature. .
[0014]
Further, a seventh heat treatment method of the present invention for achieving the above object is a heat treatment method for heat-treating a cylindrical member in which a through hole penetrating from an inner wall surface to an outer wall surface is formed.
(15) The outer wall surface is induction-heated to have a predetermined temperature, and the corner portion formed by the outer wall surface and the through-hole is induction-heated to have the predetermined temperature. .
[0015]
here,
(16) When the corner portion is induction-heated to the predetermined temperature, the peripheral portion may be induction-heated while the corner portion is cooled.
[0016]
further,
(17) A jig having an outer diameter smaller than the inner diameter of the through hole is inserted into the through hole so as not to contact the inner surface of the through hole, and is disposed in the vicinity of the corner portion.
(18) When the peripheral portion is induction-heated while cooling the corner portion, the corner portion may be cooled by jetting a coolant into the through hole.
[0017]
Further, an eighth heat treatment method of the present invention for achieving the above object is a heat treatment method in which a cylindrical member having a through hole penetrating from an inner wall surface to an outer wall surface is heat-treated in water.
(19) A jig having an outer diameter smaller than the inner diameter of the through hole is inserted into the through hole so as not to contact the inner surface of the through hole, and the corner portion formed by the inner wall surface and the through hole and the The jig is placed in the vicinity of both corners formed by the outer wall surface and the through hole,
(20) The inner wall surface and the outer wall surface are induction-heated to a predetermined temperature.
[0018]
Further, a ninth heat treatment method of the present invention for achieving the above object is a heat treatment method in which a cylindrical member having a through hole penetrating from an inner wall surface to an outer wall surface is heat-treated in water.
(21) A jig having an outer diameter smaller than the inner diameter of the through hole is inserted into the through hole so as not to contact the inner surface of the through hole, and in the vicinity of a corner formed by the inner wall surface and the through hole. Place the jig in
(22) The inner wall surface is induction-heated to a predetermined temperature.
[0019]
Further, a tenth heat treatment method of the present invention for achieving the above object is a heat treatment method in which a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface is heat-treated in water.
(23) A jig having an outer diameter smaller than the inner diameter of the through hole is inserted into the through hole so as not to contact the inner surface of the through hole, and in the vicinity of a corner formed by the outer wall surface and the through hole. Place the jig in
(24) The outer wall surface is induction-heated to a predetermined temperature.
[0020]
In addition, an eleventh heat treatment method of the present invention for achieving the above object is a heat treatment method for induction-quenching a cylindrical member in which a through hole penetrating from an inner wall surface to an outer wall surface is formed.
(25) Inductively heating at least a peripheral portion of the through-hole of the inner wall surface and the outer wall surface or any one of the wall surfaces to a predetermined quenching temperature, and the induction-heated peripheral portion And the corners formed by the through holes are also hardened by induction heating so that the predetermined quenching temperature is reached.
[0021]
here,
(26) When the corner portion is induction-heated so as to have the predetermined quenching temperature, the peripheral portion may be induction-heated while the corner portion is cooled.
[0022]
further,
(27) A jig having an outer diameter smaller than the inner diameter of the through-hole is inserted into the through-hole so as not to contact the inner surface of the through-hole, and is arranged in the vicinity of the corner portion,
(28) When the peripheral portion is induction-heated while cooling the corner portion, the corner portion may be cooled by jetting a coolant into the through hole.
[0023]
Further, a twelfth heat treatment method of the present invention for achieving the above object is a heat treatment method in which a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface is induction-quenched in water.
(29) A jig having an outer diameter smaller than the inner diameter of the through hole is inserted into the through hole so as not to contact the inner surface of the through hole, and the corner portion formed by the inner wall surface and the through hole and The jig is placed in the vicinity of both corners formed by the outer wall surface and the through hole,
(30) The inner wall surface and the outer wall surface are quenched by induction heating to a predetermined quenching temperature.
[0024]
Further, a thirteenth heat treatment method of the present invention for achieving the above object is a heat treatment method in which a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface is induction-quenched in water.
(31) A jig having an outer diameter smaller than the inner diameter of the through hole is inserted into the through hole so as not to contact the inner surface of the through hole, and in the vicinity of a corner formed by the inner wall surface and the through hole Place the jig in
(32) The inner wall surface is quenched by induction heating to a predetermined quenching temperature.
[0025]
The fourteenth heat treatment method of the present invention for achieving the above object is a heat treatment method in which a cylindrical member having a through hole penetrating from an inner wall surface to an outer wall surface is induction-quenched in water.
(33) A jig having an outer diameter smaller than the inner diameter of the through hole is inserted into the through hole so as not to contact the inner surface of the through hole, and in the vicinity of a corner formed by the outer wall surface and the through hole. Place the jig in
(34) The outer wall surface is induction-heated to a predetermined quenching temperature.
[0026]
Moreover, the first heat treatment jig of the present invention for achieving the above object is a heat treatment jig used when heat-treating a member in which a through hole penetrating from one surface to the other surface is formed. In
(35) It has an outer diameter smaller than the inner diameter of the through hole, and is provided with a rod-like portion inserted into the through hole so as not to contact the inner surface of the through hole.
[0027]
Further, the second heat treatment jig of the present invention for achieving the above object is a heat treatment jig used when heat treating a cylindrical member in which a through hole penetrating from the inner wall surface to the outer wall surface is formed. In
(36) a rod-shaped portion having an outer diameter smaller than the inner diameter of the through hole;
(37) A holding portion for holding the rod-shaped portion in the through hole so as not to contact the inner surface of the through-hole.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
[0029]
A first embodiment of the present invention will be described with reference to FIGS.
[0030]
FIG. 1 is a perspective view showing a flat plate and a heat treatment jig that are induction-quenched in the atmosphere. FIG. 2 is a cross-sectional view showing a flat plate in which a rod-like portion of the heat treatment jig of FIG. 1 is inserted into a through hole.
[0031]
A through hole 16 penetrating from one surface 12 to the other surface 14 is formed in the flat plate 10 (an example of a member having a through hole formed in the present invention). Here, the case where one surface 12 is induction-hardened will be described. A heat treatment jig 20 (an example of a jig according to the present invention) used when induction hardening one surface 12 holds a rod-like portion 22 inserted into the through-hole 16 and the rod-like portion 22. Holding part 24.
[0032]
The rod-like portion 22 has an outer diameter that is smaller than the inner diameter of the through hole 16. The holding portion 24 extends from the base of the rod-shaped portion 22 substantially orthogonally to the rod-shaped portion 22, and holds the rod-shaped portion 22 inserted into the through hole 16 so as not to contact the inner surface of the through hole 16. A pair of holding claws 24a having elasticity (springiness) is formed at both ends in the longitudinal direction of the holding portion 24, and the pair of holding claws 24a sandwich both side surfaces 18a and 18b of the flat plate 10. As a result, the heat treatment jig 20 is fixed to the flat plate 10 and the rod-like portion 22 is held so as not to contact the inner surface of the through hole 16. Further, a hole 24 b for allowing the coolant 32 to pass therethrough is formed in the vicinity of the connection portion with the rod-shaped portion 22 in the holding portion 24.
[0033]
The pair of holding claws 24a may be configured to sandwich the upper surface 19a and the lower surface 19b of the flat plate. Further, two sets of holding claws that sandwich both side surfaces 18a and 18b of the flat plate 10 and both the upper surface 19a and the lower surface 19b may be formed on the heat treatment jig 20.
[0034]
In the example described above, the through hole 16 is cylindrical (having a circular cross section), but may be a prismatic through hole (a cross section having a triangular or square cross section) such as a triangle or a quadrangle. In this case, the rod-like portion 22 has a prismatic shape such as a triangle or a quadrangle in accordance with the shape of the through hole 16.
[0035]
A heat treatment method for induction-quenching one surface 12 of the flat plate 10 using the above-described heat treatment jig 20 will be described.
[0036]
The flat plate 10 is arranged substantially horizontally, the rod-like portion 22 of the heat treatment jig 20 is inserted into the through-hole 16 from above (from the other surface 14 side), and both side surfaces 18a and 18b of the flat plate 10 are paired with a pair of holding claws 24a. Then, the heat treatment jig 20 is fixed to the flat plate 10. Thereby, as shown in FIG. 2, the rod-like portion 22 is arranged so as not to contact the through hole 16. In this case, the gap t between the through hole 16 and the rod-shaped portion 22 is about 0.5 mm.
[0037]
In the state as described above, the induction heating coil 30 is brought close to one surface 12 of the flat plate 10 to inductively heat the surface 12 to a predetermined quenching temperature and penetrate from above (from the other surface 14 side). Coolant 32 is injected into the holes 16. The injected coolant 32 passes through the hole 24b and the like, passes through the gap t, and falls from the surface 12 side. The corner portion 11 formed by the surface 12 and the through hole 16 is appropriately cooled by the coolant 32. As a result, the corner portion 11 also has the same quenching temperature as the surface 12, and the corner portion 11 is not induction-heated above this quenching temperature. Therefore, the corner portion 11 is not dissolved.
[0038]
Since the cooling liquid 32 falls almost directly below, the cooling liquid 32 hardly comes into contact with the surface 12 that is being induction-heated (an example of the peripheral portion in the present invention). Not cooled. Therefore, both the surface 12 and the corner 11 are induction heated to an appropriate quenching temperature. After the surface 12 and the corner portion 11 are heated to an appropriate quenching temperature, a hardened layer is formed on the surface 12 and the corner portion 11 by spraying a coolant from below to the surface 12. When the coolant is sprayed from below to the surface 12, the coolant 32 is also sprayed from above the other surface 14.
[0039]
When quenching both the one surface 12 and the other surface 14, after quenching the surface 12 by the above-described method, the surface 14 is quenched by the above-described method against the flat plate 10 so that the surface 14 faces upward. Moreover, although said example demonstrated quenching, said heat processing method is applicable also to annealing and tempering. In this case, the surface 12 is heated to a predetermined annealing temperature or tempering temperature while cooling the corner 11 as described above. As a result, the surface 12 and the corner portion 11 are heated to a predetermined annealing temperature or tempering temperature. Further, the heat treatment method is not limited to the flat plate 10 and can be applied to, for example, a curved plate.
[Second Embodiment]
[0040]
A second embodiment of the present invention will be described with reference to FIG.
[0041]
FIG. 3 is a cross-sectional view showing a flat plate and a heat treatment jig that are induction-quenched in water. 3, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals.
[0042]
A case where one surface 12 of the flat plate 10 is induction-quenched in water will be described. The heat treatment jig 20 used in the induction hardening is the same as the heat treatment jig 20 of the first embodiment.
[0043]
The rod-like portion 22 of the heat treatment jig 20 is inserted into the through-hole 16 from the other surface 14 side, and the both side surfaces 18a and 18b of the flat plate 10 are sandwiched between the pair of holding claws 24a of the heat treatment jig 20 for heat treatment. The jig 20 is fixed to the flat plate 10. In this case, as in the first embodiment, the gap t between the through hole 16 and the rod-shaped portion 22 is kept at about 0.5 mm, and the rod-shaped portion 22 is not brought into contact with the through-hole 16. The flat plate 10 to which the heat treatment jig 20 is fixed is fixed to the mounting table 33 of the container 30. The container 30 is filled with water 34.
[0044]
In the state as described above, the induction heating coil 40 is brought close to one surface 12 of the flat plate 10, and the induction heating coil 40 is supplied with appropriate high frequency power to induce the surface 12 to a predetermined quenching temperature. Heat. The corner portion 11 is also heated by this induction heating. However, the gap t between the through hole 16 and the rod-shaped portion 22 is filled with water 34, and the corner portion 11 is cooled by the appropriate amount of the filled water 34. It is not heated above the temperature. Therefore, the corner portion 11 is not dissolved. When the heat treatment jig 20 is not used, all of the through holes 16 are filled with water 34, and the corners 11 are overcooled. For this reason, even if the surface 12 reaches a predetermined quenching temperature, the corner portion 11 does not reach the predetermined quenching temperature. Therefore, the above-described gap t is set so that the corner 11 has a predetermined quenching temperature.
[0045]
After the surface 12 and the corner 11 are induction-heated to a predetermined quenching temperature as described above, the high-frequency power supplied to the induction heating coil 40 is stopped. Since the surface 12 and the corner portion 11 are in contact with the water 34, the surface 12 and the corner portion 11 are rapidly cooled, and a hardened layer is formed on the surface 12 and the corner portion 11.
[0046]
When both the one surface 12 and the other surface 14 are quenched, after the surface 12 is quenched by the above-described method, the rod-like portion 22 of the heat treatment jig 20 is inserted from the one surface 12 side, and the heat treatment is performed. The heat treatment jig 20 is fixed to the flat plate 10 by sandwiching the both side surfaces 18a and 18b of the flat plate 10 with a pair of holding claws 24a of the jig 20 for use. Thereafter, the procedure is similar to the procedure of quenching the surface 12. Further, when the surface 12 and the surface 14 are simultaneously quenched, the rod-shaped portion 22 is inserted into the through-hole 16 using a heat treatment jig whose portion other than the rod-shaped portion 22 is as small as possible. Are heated at the same time.
[0047]
In the above example, quenching has been described, but the above heat treatment method can also be applied to annealing and tempering. In this case, the surface 12 is heated to a predetermined annealing temperature or tempering temperature while cooling the corner 11 as described above. As a result, the surface 12 and the corner portion 11 are heated to a predetermined annealing temperature or tempering temperature. Further, the heat treatment method is not limited to the flat plate 10 and can be applied to, for example, a curved plate.
[Third Embodiment]
[0048]
A third embodiment of the present invention will be described with reference to FIGS.
[0049]
FIG. 4 is a perspective view showing a cylindrical member and a heat treatment jig that are induction-quenched in the atmosphere. FIG. 5 is a cross-sectional view showing a cylindrical member in which a rod-like portion of the heat treatment jig of FIG. 4 is inserted into a through hole.
[0050]
The cylindrical member 50 is formed with two through holes 56 penetrating from the inner wall surface 52 to the outer wall surface 54. Here, the case where the inner wall surface 52 of the cylindrical member 50 is induction-hardened will be described. A heat treatment jig 60 (an example of a jig according to the present invention) used when induction hardening the inner wall surface 52 holds a rod-shaped portion 62 inserted into the through hole 56 and the rod-shaped portion 62. Holding part 64.
[0051]
The rod-shaped portion 62 has an outer diameter that is smaller than the inner diameter of the through hole 56. The holding portion 64 extends from the base of the rod-shaped portion 62 so as to be substantially orthogonal to the rod-shaped portion 62, and holds the rod-shaped portion 62 inserted into the through hole 56 so as not to contact the inner surface of the through hole 56. A pair of holding claws 64a having elasticity (springiness) is formed in the holding portion 64, and the outer wall surface 54 of the cylindrical member 50 is sandwiched between the pair of holding claws 64a. Accordingly, the heat treatment jig 60 is fixed to the cylindrical member 50 and the rod-shaped portion 62 is held so as not to contact the inner surface of the through hole 56. In addition, a hole 64 b for allowing the coolant 32 to pass therethrough is formed in the vicinity of the connection portion with the rod-shaped portion 62 in the holding portion 64.
[0052]
In the above-described example, the through hole 56 has a cylindrical shape (having a circular cross section), but may be a prismatic through hole (a cross section having a triangular or square shape) such as a triangle or a quadrangle. In this case, the rod-like portion 62 has a prismatic shape such as a triangle or a quadrangle in accordance with the shape of the through hole 56.
[0053]
A heat treatment method for induction hardening the inner wall surface 52 of the cylindrical member 50 using the heat treatment jig 60 described above will be described.
[0054]
The cylindrical member 50 is placed upright, the rod-shaped portion 62 of the heat treatment jig 60 is inserted into the through hole 56 from the outer wall surface 54 side, and the outer wall surface 54 of the cylindrical member 50 is sandwiched between the pair of holding claws 64a. The jig 60 is fixed to the cylindrical member 50. Thereby, as shown in FIG. 5, the rod-like portion 62 is arranged so as not to contact the through hole 56. In this case, the gap t between the through hole 56 and the rod-shaped portion 62 is about 0.5 mm.
[0055]
In the state as described above, the induction heating coil 70 (also serving as a cooling jacket for injecting the cooling liquid) is inserted into the hollow portion of the cylindrical member 50, and the induction heating coil 70 is brought close to the inner wall surface 52. In this state, an appropriate high frequency power is supplied to the induction heating coil 70 to inductively heat the inner wall surface 52 to a predetermined quenching temperature, and the coolant 32 is injected into the through hole 56 from the outer wall surface 54 side. The coolant 32 enters the through hole 56 through the hole 64b and the like, and the corner portion 58 formed by the inner wall surface 52 and the through hole 56 is appropriately cooled. As a result, the corner portion 58 also has the same quenching temperature as the inner wall surface 52, and the corner portion 58 is not induction-heated above the quenching temperature. Therefore, the corner portion 58 is not dissolved. Therefore, both the inner wall surface 52 and the corner portion 58 are induction-heated to an appropriate quenching temperature. After the inner wall surface 52 and the corner portion 58 are heated to an appropriate quenching temperature, a cooling layer is sprayed from the induction heating coil 70 toward the inner wall surface 52, whereby a hardened layer is formed on the inner wall surface 52 and the corner portion 58. It is formed. When injecting the coolant from the induction heating coil 70 toward the inner wall surface 52, the coolant 32 is sprayed from the outer wall surface 54 side to the through hole 56.
[0056]
In the above example, quenching has been described, but the above heat treatment method can also be applied to annealing and tempering. In this case, the inner wall surface 52 is heated to a predetermined annealing temperature or tempering temperature while cooling the corner 58 as described above. As a result, the inner wall surface 52 and the corner portion 58 are heated to a predetermined annealing temperature or tempering temperature. Further, the heat treatment method is not limited to the cylindrical member 50 and can be applied to, for example, a prism.
[Fourth Embodiment]
[0057]
A fourth embodiment of the present invention will be described with reference to FIG.
[0058]
FIG. 6 is a cross-sectional view showing a cylindrical member and a heat treatment jig that are induction-quenched in water. In FIG. 6, the same components as those shown in FIGS. 4 and 5 are denoted by the same reference numerals.
[0059]
A case where the inner wall surface 52 of the cylindrical member 50 is induction-quenched in water will be described. The heat treatment jig 60 used in the induction hardening is the same as the heat treatment jig 60 of the third embodiment.
[0060]
The rod-shaped portion 62 of the heat treatment jig 60 is inserted from the outer wall surface 54 side, and the outer wall surface 54 of the cylindrical member 50 is sandwiched between the pair of holding claws 64a of the heat treatment jig 60 so that the heat treatment jig 60 is cylindrical. It fixes to the shaped member 50. In this case, as in the third embodiment, the gap t between the through hole 56 and the rod-shaped portion 62 is kept at about 0.5 mm, and the rod-shaped portion 62 is not brought into contact with the through-hole 56. The cylindrical member 50 to which the heat treatment jig 60 is fixed is fixed to the mounting table 33 of the container 30. The container 30 is filled with water 34.
[0061]
In the state as described above, the induction heating coil 80 is brought close to the inner wall surface 52 of the cylindrical member 50, and an appropriate high frequency power is supplied to the induction heating coil 80, so that the inner wall surface 52 has a predetermined quenching temperature. Induction heating. The corner portion 58 is also heated by this induction heating. However, the gap t between the through hole 56 and the rod-shaped portion 62 is filled with water 34, and the corner 58 is cooled by the filled water 34 in an appropriate amount. It is not heated above the temperature. Therefore, the corner portion 58 is not dissolved. When the heat treatment jig 60 is not used, all of the through holes 56 are filled with water 34, and the corners 58 are overcooled. For this reason, even if the inner wall surface 52 reaches a predetermined quenching temperature, the corner portion 58 does not reach the predetermined quenching temperature. Accordingly, the gap t described above is set so that the corner portion 58 has a predetermined quenching temperature.
[0062]
After induction heating the inner wall surface 52 and the corner 58 to a predetermined quenching temperature as described above, the high frequency power supplied to the induction heating coil 80 is stopped. Since the inner wall surface 52 and the corner portion 58 are in contact with the water 34, the inner wall surface 52 and the corner portion 58 are rapidly cooled, and a hardened layer is formed on the inner wall surface 52 and the corner portion 58.
[0063]
In addition, although said example demonstrated quenching, said heat processing method is applicable also to annealing and tempering. In this case, the inner wall surface 52 is heated to a predetermined annealing temperature or tempering temperature while cooling the corner 58 as described above. As a result, the inner wall surface 52 and the corner portion 58 are heated to a predetermined annealing temperature or tempering temperature.
[Fifth Embodiment]
[0064]
A fifth embodiment of the present invention will be described with reference to FIGS.
[0065]
FIG. 7 is a perspective view showing a cylindrical member and a jig for heat treatment that are induction-quenched in the atmosphere. FIG. 8 is a cross-sectional view showing a cylindrical member in which a rod-like portion of the heat treatment jig of FIG. 7 is inserted into a through hole. In these drawings, the same components as those shown in FIGS. 4 and 5 are denoted by the same reference numerals.
[0066]
Here, the case where the outer wall surface 54 of the cylindrical member 50 is induction-hardened will be described. A heat treatment jig 90 (an example of a jig according to the present invention) used when induction-hardening the outer wall surface 54 holds a rod-shaped portion 92 inserted into the through hole 56 and the rod-shaped portion 92. Holding part 94.
[0067]
The rod-shaped portion 92 has an outer diameter that is smaller than the inner diameter of the through hole 56. The holding portion 94 holds the rod-like portion 92 inserted into the through hole 56 so as not to contact the inner surface of the through hole 56. A pair of holding claws 94a having elasticity (spring property) is formed in the holding portion 94, and the upper end surface 50a and the lower end surface 50b of the cylindrical member 50 are sandwiched between the pair of holding claws 94a. As a result, the heat treatment jig 90 is fixed to the cylindrical member 50, and the rod-shaped portion 92 is held so as not to contact the inner surface of the through hole 56.
[0068]
In the above-described example, the through hole 56 has a cylindrical shape (having a circular cross section), but may be a prismatic through hole (a cross section having a triangular or square shape) such as a triangle or a quadrangle. In this case, the rod-shaped portion 92 has a prismatic shape such as a triangle or a quadrangle in accordance with the shape of the through hole 56.
[0069]
A heat treatment method for induction-quenching the outer wall surface 54 of the cylindrical member 50 using the above-described heat treatment jig 90 will be described.
[0070]
The cylindrical member 50 is placed upright, the rod-shaped portion 92 of the heat treatment jig 90 is inserted into the through hole 56 from the inner wall surface 52 side, and the upper end surface 50a and the lower end surface 50b of the cylindrical member 50 are connected by a pair of holding claws 94a. The jig 90 for heat treatment is fixed to the cylindrical member 50. Thereby, as shown in FIG. 8, the rod-shaped portion 92 is disposed so as not to contact the through hole 56. In this case, the gap t between the through hole 56 and the rod-shaped portion 92 is about 0.5 mm.
[0071]
In the state as described above, the cooling jacket 100 is inserted into the hollow portion of the cylindrical member 50, and the induction heating coil (also serving as the cooling jacket for injecting the cooling liquid) 110 is brought close to the outer wall surface 54. High frequency power is supplied to the induction heating coil 110 to inductively heat the outer wall surface 54 to a predetermined quenching temperature, and the coolant 102 is sprayed from the cooling jacket 100 onto the inner wall surface 52. The cooling liquid 102 enters the through hole 56 and cools the corner portion 59 formed by the outer wall surface 54 and the through hole 56, so that the corner portion 59 also has the same quenching temperature as the outer wall surface 54. 59 is not induction heated above this quenching temperature. For this reason, the corner | angular part 59 does not melt | dissolve. Therefore, both the outer wall surface 54 and the corner 59 are induction heated to an appropriate quenching temperature. Note that the shape of the holding portion 94 is a shape that does not prevent the coolant 102 sprayed from the cooling jacket 100 from entering the through hole 56.
[0072]
After the outer wall surface 54 and the corner portion 59 are heated to an appropriate quenching temperature, a hardened layer is formed on the outer wall surface 54 and the corner portion 59 by injecting a coolant from the induction heating coil 110 toward the outer wall surface 54. It is formed. When injecting the coolant from the induction heating coil 110 toward the outer wall surface 54, the coolant 102 is still sprayed from the cooling jacket 100 to the inner wall surface 52.
[0073]
In the above example, quenching has been described, but the above heat treatment method can also be applied to annealing and tempering. In this case, the outer wall surface 54 is heated to a predetermined annealing temperature or tempering temperature while cooling the corner 59 as described above. As a result, the outer wall surface 54 and the corner portion 59 are heated to a predetermined annealing temperature or tempering temperature. Further, the heat treatment method is not limited to the cylindrical member 50 and can be applied to, for example, a prism.
[Sixth Embodiment]
[0074]
A sixth embodiment of the present invention will be described with reference to FIG.
[0075]
FIG. 9 is a sectional view showing a cylindrical member and a heat treatment jig that are induction-quenched in water. In FIG. 9, the same components as those shown in FIGS. 7 and 8 are denoted by the same reference numerals.
[0076]
A case where the outer wall surface 54 of the cylindrical member 50 is induction-quenched in water will be described. The heat treatment jig 90 used in the induction hardening is the same as the heat treatment jig 90 of the fifth embodiment.
[0077]
The rod-shaped portion 92 of the heat treatment jig 90 is inserted into the through hole 56 from the inner wall surface 52 side, and the upper end surface 50a and the lower end surface 50b of the cylindrical member 50 are sandwiched between the pair of holding claws 94a of the heat treatment jig 90. The heat treatment jig 90 is fixed to the cylindrical member 50. In this case, as in the fifth embodiment, the gap t between the through hole 56 and the rod-shaped portion 92 is kept at about 0.5 mm, and the rod-shaped portion 92 is not brought into contact with the through-hole 56. The cylindrical member 50 to which the heat treatment jig 90 is fixed is fixed to the mounting table 33 of the container 30. The container 30 is filled with water 34.
[0078]
In the state as described above, the induction heating coil 110 is brought close to the outer wall surface 54 of the cylindrical member 50, and an appropriate high-frequency power is supplied to the induction heating coil 110, thereby bringing the outer wall surface 54 into a predetermined quenching temperature. Induction heating. The corner portion 59 is also heated by this induction heating. However, the gap t between the through-hole 56 and the rod-shaped portion 92 is filled with water 34, and the corner 59 is cooled by the filled amount of water 34. It is not heated above the temperature. Therefore, the corner portion 59 is not dissolved. When the heat treatment jig 90 is not used, all of the through holes 56 are filled with water 34, and the corners 59 are overcooled. For this reason, even if the outer wall surface 54 reaches a predetermined quenching temperature, the corner portion 59 does not reach the predetermined quenching temperature. Therefore, the above-described gap t is set so that the corner portion 59 has a predetermined quenching temperature.
[0079]
After induction heating the outer wall surface 54 and the corner 59 to a predetermined quenching temperature as described above, the high frequency power supplied to the induction heating coil 110 is stopped. Since the outer wall surface 54 and the corner portion 59 are in contact with the water 34, the outer wall surface 54 and the corner portion 59 are rapidly cooled, and a hardened layer is formed on the outer wall surface 54 and the corner portion 59.
[0080]
In addition, although said example demonstrated quenching, said heat processing method is applicable also to annealing and tempering. In this case, the outer wall surface 54 is heated to a predetermined annealing temperature or tempering temperature while cooling the corner 59 as described above. As a result, the outer wall surface 54 and the corner portion 59 are heated to a predetermined annealing temperature and tempering temperature.
[0081]
Further, in each of the above embodiments, the corner portion is cooled by inserting a rod-like portion into the through-hole to form a gap between the through-hole and the rod-like portion, and allowing the coolant to enter the gap. You may cool a corner | angular part by making a pipe contact a corner | angular part and an inner surface of a through-hole, and flowing a cooling fluid through this pipe. In this case, the temperature at which the corners are cooled can be appropriately adjusted by appropriately adjusting the temperature of the coolant flowing through the pipe.
[0082]
【The invention's effect】
As described above, according to the first heat treatment method of the present invention, the corner portion is induction-heated so as to have the same predetermined temperature as the peripheral portion to be induction-heated. Therefore, this corner is not induction-heated above the predetermined temperature.
[0083]
Here, when the peripheral portion is induction-heated while cooling the corner portion when the corner portion is induction-heated to the predetermined temperature, induction heating is easily performed so that the corner portion reaches the predetermined temperature. it can.
[0084]
Further, a jig having an outer diameter smaller than the inner diameter of the through-hole is inserted into the through-hole so as not to contact the inner surface of the through-hole, and is arranged in the vicinity of the corner to cool the corner. However, when the peripheral portion is induction-heated, when the coolant cools the corner by injecting the coolant into the through-hole, the coolant entering the gap between the through-hole and the jig during induction heating Since it cools, the temperature of a corner | angular part is cooled appropriately and the temperature does not rise easily. Accordingly, the corners are induction-heated so as to have the same predetermined temperature as the peripheral part of the through hole. As a result, the corner portion is not heated by induction heating to a predetermined temperature or higher and does not melt.
[0085]
Further, according to the second heat treatment method of the present invention, water enters the gap between the jig and the through hole, so that the temperature of the corner is appropriately cooled and the temperature is unlikely to rise. Accordingly, the corners are induction-heated so as to have the same predetermined temperature as the peripheral part of the through hole. As a result, the corner portion is not heated by induction heating to a predetermined temperature or higher and does not melt.
[0086]
Further, according to the third heat treatment method of the present invention, the corner portion is induction-heated so as to have the same predetermined quenching temperature as the peripheral portion of the through hole. Therefore, the corner portion is not induction-heated above the predetermined quenching temperature.
[0087]
Here, when induction heating the peripheral portion while cooling the corner portion when the corner portion is induction heated to the predetermined quenching temperature, the corner portion has a predetermined quenching temperature. Inductive heating can be performed easily.
[0088]
Further, a jig having an outer diameter smaller than the inner diameter of the through-hole is inserted into the through-hole so as not to contact the inner surface of the through-hole, and is arranged in the vicinity of the corner to cool the corner. However, when cooling the corner portion by injecting a cooling liquid into the through-hole when the peripheral portion is induction-heated, the coolant entering the gap between the through-hole and the jig cools the corner portion. The temperature of the corner is appropriately cooled and the temperature is unlikely to rise. Accordingly, the corners are induction-heated so as to have the same predetermined temperature as the peripheral part of the through hole. As a result, the corner portion is not heated by induction heating to a predetermined temperature or higher and does not melt.
[0089]
Further, according to the fourth heat treatment method of the present invention, water enters the gap between the jig and the through hole, so that the temperature of the corner is appropriately cooled and the temperature is unlikely to rise. Accordingly, the corners are induction-heated so as to have the same predetermined temperature as the peripheral part of the through hole. As a result, the corner portion is not heated by induction heating to a predetermined temperature or higher and does not melt.
[0090]
Further, according to the fifth heat treatment method of the present invention, the two corners are induction-heated so as to have the same predetermined temperature as both the inner wall surface and the outer wall surface. Therefore, this corner is not induction-heated above the predetermined temperature.
[0091]
Further, according to the sixth heat treatment method of the present invention, the corner is induction-heated so as to have the same predetermined temperature as the inner wall surface. Therefore, this corner is not induction-heated above the predetermined temperature.
[0092]
Further, according to the seventh heat treatment method of the present invention, the corner is induction-heated so as to have the same predetermined temperature as the outer wall surface. Therefore, this corner is not induction-heated above the predetermined temperature.
[0093]
Here, when the peripheral portion is induction-heated while cooling the corner portion when the corner portion is induction-heated to the predetermined temperature, induction heating is easily performed so that the corner portion reaches the predetermined temperature. it can.
[0094]
Further, a jig having an outer diameter smaller than the inner diameter of the through-hole is inserted into the through-hole so as not to contact the inner surface of the through-hole, and is arranged in the vicinity of the corner to cool the corner. However, when cooling the corner portion by injecting a cooling liquid into the through-hole when the peripheral portion is induction-heated, the coolant entering the gap between the through-hole and the jig cools the corner portion. Corners can be easily cooled.
[0095]
Further, according to the eighth heat treatment method of the present invention, since water enters the gap between the jig and the through hole, the temperature of the corner is appropriately cooled and the temperature is unlikely to rise. Accordingly, the corners are induction-heated so as to have the same predetermined temperature as the inner wall surface and the outer wall surface. As a result, the corner portion is not heated by induction heating to a predetermined temperature or higher and does not melt.
[0096]
Further, according to the ninth heat treatment method of the present invention, since water enters the gap between the jig and the through hole, the temperature of the corner is appropriately cooled and the temperature is unlikely to rise. Therefore, the corners are induction-heated so as to have the same predetermined temperature as the inner wall surface. As a result, the corner portion is not heated by induction heating to a predetermined temperature or higher and does not melt.
[0097]
Further, according to the tenth heat treatment method of the present invention, since water enters the gap between the jig and the through hole, the temperature of the corner is appropriately cooled and the temperature is unlikely to rise. Therefore, the corners are induction-heated so as to have the same predetermined temperature as the outer wall surface. As a result, the corner portion is not heated by induction heating to a predetermined temperature or higher and does not melt.
[0098]
Further, according to the eleventh heat treatment method of the present invention, the corner portion is induction-heated so as to have the same predetermined quenching temperature as that of the peripheral portion of the through hole. Therefore, the corner portion is not induction-heated above the predetermined quenching temperature.
[0099]
Here, when induction heating the peripheral portion while cooling the corner portion when the corner portion is induction heated to the predetermined quenching temperature, the corner portion has a predetermined quenching temperature. Inductive heating can be performed easily.
[0100]
Further, a jig having an outer diameter smaller than the inner diameter of the through hole is inserted into the through hole so as not to contact the inner surface of the through hole, and is arranged in the vicinity of the corner, thereby cooling the corner. At this time, when the corner is cooled by spraying the coolant into the through-hole, the corner that is cooled can be easily cooled because the coolant entering the gap between the through-hole and the jig cools the corner.
[0101]
Further, according to the twelfth heat treatment method of the present invention, since water enters the gap between the jig and the through hole, the temperature of the corner is appropriately cooled and the temperature is unlikely to rise. Accordingly, the corners are induction-heated so as to have a quenching temperature with the inner wall surface and the outer wall surface. As a result, the corner portion is not heated by induction heating beyond the quenching temperature and melted.
[0102]
Further, according to the thirteenth heat treatment method of the present invention, since water enters the gap between the jig and the through hole, the temperature of the corner is appropriately cooled and the temperature is unlikely to rise. Accordingly, the corners are induction-heated so as to have the same quenching temperature as the inner wall surface. As a result, the corner portion is not heated by induction heating beyond the quenching temperature and melted.
[0103]
Further, according to the fourteenth heat treatment method of the present invention, since water enters the gap between the jig and the through hole, the temperature of the corner is appropriately cooled and the temperature is unlikely to rise. Accordingly, the corners are induction-heated so as to have the same quenching temperature as the outer wall surface. As a result, the corner portion is not heated by induction heating beyond the quenching temperature and melted.
[0104]
In addition, when heat-treating the member having the through hole using the first heat treatment jig of the present invention, the rod-shaped portion of the heat treatment jig should be formed in the through hole so as not to contact the inner surface of the through hole. insert. For this reason, a gap (space) is formed between the rod-shaped portion and the inner surface of the through hole. When induction heating is performed so that at least the peripheral portion of the through-hole of one surface and the other surface of the above-described member or any one of the surfaces is at a predetermined temperature, a coolant is injected into the through-hole. By changing the outer diameter of the rod-shaped portion, the amount of the coolant passing through the gap can be adjusted. Since this cooling liquid passes through the gap between the rod-shaped portion and the inner surface of the through hole, the corner portion formed by the peripheral portion and the through hole is cooled. As a result, the corner portion is induction-heated so as to have the same temperature as the peripheral portion of the through hole. Therefore, the corner portion is not induction heated to a temperature higher than necessary.
[0105]
In addition, when the cylindrical member having the through hole is heat-treated using the second heat treatment jig of the present invention, the rod-shaped portion of the heat treatment jig is held so as not to contact the inner surface of the through hole. Held in the department. For this reason, a gap (space) remains formed between the rod-shaped portion and the inner surface of the through hole. When induction heating at least the peripheral portion of the through hole of both the inner wall surface and the outer wall surface of the cylindrical member or any one of the surfaces to a predetermined temperature, a coolant is injected into the through hole. By changing the outer diameter of the rod-shaped portion, the amount of the coolant passing through the gap can be adjusted. Since this cooling liquid passes through the gap between the rod-shaped portion and the inner surface of the through hole, the corner portion formed by the peripheral portion and the through hole is cooled. As a result, the corner portion is induction-heated so as to have the same temperature as the peripheral portion of the through hole. Therefore, the corner portion is not induction heated to a temperature higher than necessary.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a flat plate and a heat treatment jig that are induction-quenched in the atmosphere.
2 is a cross-sectional view showing a flat plate in which a rod-like portion of the heat treatment jig of FIG. 1 is inserted into a through hole.
FIG. 3 is a cross-sectional view showing a flat plate and a heat treatment jig that are induction-quenched in water.
FIG. 4 is a perspective view showing a cylindrical member and a heat treatment jig that are induction-hardened in the atmosphere.
5 is a cross-sectional view showing a cylindrical member in which a rod-like portion of the heat treatment jig of FIG. 4 is inserted into a through hole.
FIG. 6 is a cross-sectional view showing a cylindrical member and a heat treatment jig that are induction-quenched in water.
FIG. 7 is a perspective view showing a cylindrical member and a heat treatment jig that are induction-quenched in the atmosphere.
8 is a cross-sectional view showing a cylindrical member in which a rod-like portion of the heat treatment jig of FIG. 7 is inserted into a through hole.
FIG. 9 is a cross-sectional view showing a cylindrical member and a heat treatment jig that are induction-quenched in water.
[Explanation of symbols]
10 flat plate
11, 58, 59 Corner
12 One side of the flat plate
14 The other side of the flat plate
16,56 through hole
20, 60, 90 Heat treatment jig
22, 62, 92 Bar-shaped part
24, 64, 94 holder
50 Cylindrical member
52 inner wall
54 Exterior wall

Claims (16)

一方の面から他方の面まで貫通した貫通孔の形成された部材を熱処理する熱処理方法において、
前記一方の面及び前記他方の面双方の面若しくはいずれかの面のうちの少なくとも前記貫通孔の出入り口の周辺部分を所定温度になるように誘導加熱すると共に、前記貫通孔の出入り口部分の内面及びこの内面に連続する前記周辺部分の面双方に囲まれた角部も前記所定温度になるように誘導加熱する際に、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記貫通孔に冷却液を噴射して前記角部を冷却しながら前記周辺部分を誘導加熱することを特徴とする熱処理方法。In a heat treatment method for heat treating a member formed with a through hole penetrating from one surface to the other surface,
Inductively heating at least the peripheral part of the entrance / exit of the through-hole of one side and / or the other side of the one side to a predetermined temperature, and the inner surface of the entrance / exit part of the through-hole and When induction heating so that the corner surrounded by both surfaces of the peripheral portion continuous to the inner surface is also the predetermined temperature ,
Insert a jig having an outer diameter smaller than the inner diameter of the through hole into the through hole so as not to contact the inner surface of the through hole,
A heat treatment method comprising injecting a coolant into the through-hole to inductively heat the peripheral portion while cooling the corner portion . 一方の面から他方の面まで貫通した貫通孔の形成された部材を水中で熱処理する熱処理方法において、
前記一方の面及び前記他方の面双方の面若しくはいずれかの面のうちの少なくとも前記貫通孔の出入り口の周辺部分を所定温度に誘導加熱する際に、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておくことを特徴とする熱処理方法。In a heat treatment method in which a member formed with a through-hole penetrating from one surface to the other surface is heat-treated in water,
When induction heating at least a peripheral part of the entrance / exit of the through-hole of the one surface and the other surface or any one of the surfaces to a predetermined temperature,
Heat treatment method characterized by previously inserted into the through hole so as not to contact the jig outer diameter smaller than the inner diameter of the through hole on the inner surface of the through hole. 一方の面から他方の面まで貫通した貫通孔の形成された部材を高周波焼入れする熱処理方法において、
前記一方の面及び前記他方の面双方の面若しくはいずれかの面のうちの少なくとも前記貫通孔の出入り口の周辺部分を所定の焼入温度になるように誘導加熱すると共に、前記貫通孔の出入り口部分の内面及びこの内面に連続する前記周辺部分の面双方に囲まれた角部も前記所定の焼入温度になるように誘導加熱して焼入れする際に、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記貫通孔に冷却液を噴射して前記角部を冷却しながら前記周辺部分を誘導加熱することを特徴とする熱処理方法。In a heat treatment method in which a member formed with a through hole penetrating from one surface to the other surface is induction-quenched,
Inductively heating at least a peripheral part of the through hole entrance and exit of at least one of the one surface, the other surface, or any of the surfaces to a predetermined quenching temperature, and an entrance / exit portion of the through hole when the inner and hardening the corner surrounded by the surface both of the peripheral portion even when the induction heating so that the predetermined quenching temperature continuous to this inner surface,
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method comprising injecting a coolant into the through-hole to inductively heat the peripheral portion while cooling the corner portion . 一方の面から他方の面まで貫通した貫通孔の形成された部材を水中で高周波焼入れする熱処理方法において、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記周辺部分を所定の焼入温度になるように誘導加熱して焼入れすることを特徴とする熱処理方法。In a heat treatment method in which a member formed with a through hole penetrating from one surface to the other surface is induction-quenched in water,
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method comprising quenching the peripheral portion by induction heating so as to have a predetermined quenching temperature. 内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を熱処理する熱処理方法において、
前記内壁面及び前記外壁面双方を所定温度になるように誘導加熱すると共に、前記貫通孔の出入り口部分の内面及びこの内面に連続する前記内壁面双方に囲まれた角部と、前記貫通孔の出入り口部分の内面及びこの内面に連続する前記外壁面双方に囲まれた角部とが前記所定温度になるように誘導加熱する際に、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記貫通孔に冷却液を噴射して前記角部を冷却しながら前記内壁面及び前記外壁面を誘導加熱することを特徴とする熱処理方法。In a heat treatment method for heat treating a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface,
Inductively heating both the inner wall surface and the outer wall surface to a predetermined temperature, and an inner surface of the entrance / exit portion of the through hole and a corner portion surrounded by the inner wall surface continuous with the inner surface, When induction heating is performed so that the inner surface of the doorway part and the corner part surrounded by the outer wall surface continuous with the inner surface are at the predetermined temperature,
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method characterized by inductively heating the inner wall surface and the outer wall surface while cooling the corners by injecting a coolant into the through holes . 内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を熱処理する熱処理方法において、
前記内壁面を所定温度になるように誘導加熱すると共に、前記貫通孔の出入り口部分の内面及びこの内面に連続する前記内壁面双方に囲まれた角部も前記所定温度になるように誘導加熱する際に、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記貫通孔に冷却液を噴射して前記角部を冷却しながら前記内壁面を誘導加熱することを特徴とする熱処理方法。In a heat treatment method for heat treating a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface,
The inner wall surface is induction-heated to a predetermined temperature, and the inner surface of the entrance / exit portion of the through hole and the corner portion surrounded by the inner wall surface continuous to the inner surface are also induction-heated to the predetermined temperature. When
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method, wherein the inner wall surface is induction-heated while cooling the corner portion by injecting a coolant into the through hole . 内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を熱処理する熱処理方法において、
前記外壁面を所定温度になるように誘導加熱すると共に、前記貫通孔の出入り口部分の内面及びこの内面に連続する前記外壁面双方に囲まれた角部も前記所定温度になるように誘導加熱する際に、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記貫通孔に冷却液を噴射して前記角部を冷却しながら前記外壁面を誘導加熱することを特徴とする熱処理方法。In a heat treatment method for heat treating a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface,
The outer wall surface is induction-heated to a predetermined temperature, and the inner surface of the entrance / exit portion of the through hole and the corner portion surrounded by the outer wall surface continuous to the inner surface are also induction-heated to the predetermined temperature. When
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method, wherein the outer wall surface is inductively heated while cooling the corners by injecting a coolant into the through holes . 内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で熱処理する熱処理方法において、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記内壁面及び前記外壁面を所定温度に誘導加熱することを特徴とする熱処理方法。In a heat treatment method for heat-treating a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface in water,
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method characterized by inductively heating the inner wall surface and the outer wall surface to a predetermined temperature. 内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で熱処理する熱処理方法において、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記内壁面を所定温度に誘導加熱することを特徴とする熱処理方法。In a heat treatment method for heat-treating a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface in water,
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method characterized by induction heating the inner wall surface to a predetermined temperature. 内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で熱処理する熱処理方法において、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記外壁面を所定温度に誘導加熱することを特徴とする熱処理方法。In a heat treatment method for heat-treating a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface in water,
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method characterized by induction heating the outer wall surface to a predetermined temperature. 内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を高周波焼入れする熱処理方法において、
前記内壁面及び前記外壁面双方の壁面若しくはいずれかの壁面のうちの少なくとも前記貫通孔の出入り口の周辺部分を所定の焼入温度になるように誘導加熱すると共に、前記貫通孔の出入り口部分の内面及びこの内面に連続する前記周辺部分の面双方に囲まれた角部も前記所定の焼入温度になるように誘導加熱して焼入れする際に、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記貫通孔に冷却液を噴射して前記角部を冷却しながら前記周辺部分を誘導加熱することを特徴とする熱処理方法。In a heat treatment method in which a cylindrical member having a through hole penetrating from an inner wall surface to an outer wall surface is induction-quenched,
The inner wall surface and the outer wall surface or both of the wall surfaces, and at least the peripheral portion of the through hole entrance / exit are induction-heated to a predetermined quenching temperature, and the inner surface of the through hole entrance / exit portion and when quenching the corner surrounded by the surface both of the peripheral portion even when the induction heating so that the predetermined quenching temperature continuous to this inner surface,
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method comprising injecting a coolant into the through-hole to inductively heat the peripheral portion while cooling the corner portion . 内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で高周波焼入れする熱処理方法において、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記内壁面及び前記外壁面を所定の焼入温度に誘導加熱して焼入れすることを特徴とする熱処理方法。In a heat treatment method in which a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface is induction-quenched in water,
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method comprising quenching the inner wall surface and the outer wall surface by induction heating to a predetermined quenching temperature. 内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で高周波焼入れする熱処理方法において、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通孔に挿入しておき、
前記内壁面を所定の焼入温度に誘導加熱して焼入れすることを特徴とする熱処理方法。In a heat treatment method in which a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface is induction-quenched in water,
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method comprising quenching the inner wall surface by induction heating to a predetermined quenching temperature. 内壁面から外壁面まで貫通した貫通孔の形成された円筒状部材を水中で高周波焼入れする熱処理方法において、
前記貫通孔の内径よりも小さい外径の治具を該貫通孔の内面に接触しないように該貫通 孔に挿入しておき、
前記外壁面を所定の焼入温度に誘導加熱することを特徴とする熱処理方法。In a heat treatment method in which a cylindrical member formed with a through hole penetrating from an inner wall surface to an outer wall surface is induction-quenched in water,
Leave inserted into the through hole so as not to contact the inner surface of the through hole of the jig outer diameter smaller than the inner diameter of the through hole,
A heat treatment method characterized by inductively heating the outer wall surface to a predetermined quenching temperature. 一方の面から他方の面まで貫通した貫通孔の形成された部材を熱処理する際に使用される熱処理用治具において、
前記貫通孔の内径よりも小さい外径を有すると共に、該貫通孔の内面に接触しないように該貫通孔に挿入される棒状部を備えたことを特徴とする熱処理用治具。In a heat treatment jig used when heat treating a member formed with a through hole penetrating from one surface to the other surface,
A heat treatment jig comprising an outer diameter smaller than an inner diameter of the through hole and a rod-like portion inserted into the through hole so as not to contact the inner surface of the through hole. 内壁面から外壁面まで貫通した貫通孔が形成された円筒状部材を熱処理する際に使用される熱処理用治具において、
前記貫通孔の内径よりも小さい外径を有する棒状部と、
該棒状部が前記貫通孔の内面に接触しないように該貫通孔内に該棒状部を保持しておく保持部とを備えたことを特徴とする熱処理用治具。In a heat treatment jig used when heat treating a cylindrical member in which a through hole penetrating from an inner wall surface to an outer wall surface is formed,
A rod-like portion having an outer diameter smaller than the inner diameter of the through hole;
A heat treatment jig comprising: a holding portion for holding the rod-shaped portion in the through hole so that the rod-shaped portion does not contact the inner surface of the through hole.
JP2002122533A 2002-04-24 2002-04-24 Heat treatment method and jig for heat treatment Expired - Fee Related JP3813534B2 (en)

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