JP2004218064A

JP2004218064A - Partial heat treatment method for member to be heat-treated and apparatus therefor

Info

Publication number: JP2004218064A
Application number: JP2003154480A
Authority: JP
Inventors: Miyuki Kamata; 幸鎌田; Makoto Ueda; 誠上田; Isao Yoshida; 功吉田; Yoichi Masaki; 洋一正木; Takao Sakai; 孝雄酒井; Akiyoshi Kurihara; 秋芳栗原; Ikuya Fukuda; 郁也福田; Koji Nabeya; 耕治鍋谷
Original assignee: Topy Industries Ltd
Current assignee: Topy Industries Ltd
Priority date: 2002-11-20
Filing date: 2003-05-30
Publication date: 2004-08-05
Anticipated expiration: 2023-05-30
Also published as: JP4169635B2; CN1304603C; CN1502707A

Abstract

<P>PROBLEM TO BE SOLVED: To improve the quality of a member to be heat-treated. <P>SOLUTION: This member 1 to be heat-treated is subjected to heat treatment in only its specified portion 1a, and the heat treatment includes an induction-heating process 20P for induction-heating only the specified portion followed by a cooling process 30. Then, the above induction-heating process 20P comprises a first step heating 21, a heating stop 22 succeeding to the first step heating 21 and a second step heating 23 succeeding to the heating stop 22. Further, the partial heat treatment can be applied to partial quenching, and can be applied to partial tempering, and can be applied to both of the partial quenching and the partial tempering. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、熱処理部材の部分熱処理方法とその装置に関する。
熱処理部材は、たとえば建設機械の無限軌道帯用リンクであり、その場合、部分熱処理される部分は、ローラー踏面部である。ただし、熱処理部材は、建設機械の無限軌道帯用リンクに限るものではない。
また、部分熱処理は、部分焼入れ、または部分焼もどし、または部分焼入れおよび部分焼もどしの何れかである。
【０００２】
【従来の技術】
鉄鋼部材は、圧延または鍛造または鋳造のままで使用されるものもあるが、耐摩耗性（硬さ）、強度、靱性が要求される部材は、熱処理が施される。このように、熱処理を施して使用される部材を「熱処理部材」という。
代表的な熱処理部材として、図１２に示す、油圧ショベルおよびブルドーザー等の建設機械の無限軌道帯に使用される履板２、リンク１、ピン３、ブッシュ４、およびブルドーザー等の建設機械および除雪機械に使用される刃先（図示せず）などがある。その他、各種産業機械に使用される機械構造用部品の多くは熱処理部材である。
無限軌道帯用リンクは、過酷な条件下で使用されるため、リンク全体として耐摩耗性、強度および靱性が要求される。また、建設機械の下部走行体のローラー（転輪、図示せず）との接触面領域である、リンク１のローラー踏面部１ａ（図１３、図１４）には、特に耐摩耗性が要求される。
【０００３】
これらの要求特性を備えるために、無限軌道帯用リンクは、以下の▲１▼〜▲５▼の工程により、▲１▼〜▲５▼の工程順で、製造されている。
▲１▼ 中炭素合金鋼からなる素材を熱間鍛造してリンク形状のリンク素材とする。
▲２▼ 熱間鍛造の残熱または再加熱でＡｃ_３変態点以上の温度になっている、リンク素材の全体を急冷して焼入れする。
▲３▼ 焼入れしたリンク素材全体を高温焼もどしする。
▲４▼ 高温焼もどししたリンク素材のローラ踏面部のみを誘導加熱焼入れする（いわゆる、部分焼入れ）。
▲５▼ リンク素材のローラ踏面部のみを誘導加熱により低温焼もどしする（いわゆる部分焼もどし）か、または、リンク素材全体を炉中にて低温焼もどしする。
なお、▲４▼、▲５▼の工程の前後で、他の部品と組み立てるために機械加工を実施する。
【０００４】
したがって、リンク素材には、▲２▼、▲３▼の第１段階の熱処理と、▲４▼、▲５▼の第２段階の熱処理との、２段階の熱処理が施される。第１段階の熱処理は、リンク全体に強度および靱性を付与するための熱処理であり、第２段階の熱処理は、リンクの一部分であるローラー踏面部に耐摩耗性を付与するための熱処理である。このように、２段階の熱処理を施す理由は、リンクの部位によって要求される機械的性質が異なるためである。ここで、第１段階の熱処理のようにリンク素材全体に施される熱処理を「全体熱処理」といい、第２段階の熱処理のようにリンク素材の一部分に施される熱処理を「部分熱処理」という。
【０００５】
本発明は、上記▲１▼〜▲５▼のリンクの製造工程のうち、部分熱処理工程に係るものである。すなわち、本発明は、
（ｉ） ▲４▼の工程、すなわち、部分焼入れ工程と、▲５▼の工程、すなわち、部分焼もどし工程との両方の工程、または、
（ｉｉ） ▲４▼の工程、すなわち、部分焼入れ工程、もしくは、
（ｉｉｉ） ▲５▼の工程、すなわち、部分焼もどし工程、
の何れかに関するものである。
【０００６】
リンク素材の部分熱処理（▲４▼の部分焼入れ、▲５▼の部分焼もどし）には、従来、つぎの方法がある。
〔部分焼入れ〕
イ．リンク素材全体を冷却液槽内の冷却液中に浸漬する方法
ロ．冷却槽内でリンク素材を搬送しつつ、リンク素材のローラー踏面部のみに、大気中または液中にて、噴射ジャケットより冷却液を噴射する方法（ジェット冷却、たとえば特開昭５８−１６７７２７号公報）
ハ．リンク素材のローラー踏面部のみに、大気中にて、高圧の空気により、冷却液を噴射する方法（高圧スプレー冷却）
〔部分焼もどし〕
ニ．１工程の誘導加熱方法（たとえば、特開昭５７−５１５８３号公報）
ホ．炉中加熱方法（たとえば、特開昭５７−５１５８３号公報における従来の技術の説明）
【０００７】
【特許文献１】
特開昭５８−１６７７２７号公報
【特許文献２】
特開昭５７−５１５８３号公報
【０００８】
【発明が解決しようとする課題】
しかし、従来の部分熱処理方法には、つぎの問題がある。
〔従来の部分焼入れ方法の問題点〕
イ．の方法では、リンク素材全体は常に冷却液に接触しているが、液流がないため、冷却能力が低く、また、冷却が不均一になりやすい。その結果、焼入れ硬さ不足（いわゆる、不完全焼入れ）、焼入れ硬さ不均一（いわゆる、焼むら）、焼割れ等の品質不良が発生しやすい。
ロ．の方法では、とくに液中噴射では、冷却液中をリンクが移動するので、冷却したい部位に冷却液流を噴射して効果的に冷却するのが困難である。また、リンクのような複雑な形状の部材の場合、冷却が不均一になりやすく、焼割れ等の品質不良が発生しやすい。
ハ．の方法では、高圧噴射装置、ワーククランパー、大容量液槽、大型カバーなどが必要になるため、設備が大型になり、設備製作コストおよび設備保全コストが高くなる。
〔従来の部分焼もどし方法の問題点〕
ニ．の方法では、特定部分の、表面と芯部との温度差が大きくなり、特定部分全体を均一な温度に加熱することが困難である。
ホ．の方法では、加熱時間が長くなるため、焼もどし工程がネックとなり、インラインによる一貫生産が非常に困難である。
【０００９】
本発明の目的は、従来の部分熱処理の上記問題点の１つ以上を解消できる、熱処理部材の部分熱処理方法（部分焼入れ方法、または部分焼もどし方法、または部分焼入れ方法と部分焼もどし方法の両方、の何れであってもよい）とその装置を提供することにある。
【００１０】
より具体的には、つぎの通りである。
本発明の第１の目的は、部分熱処理の加熱工程において、短時間の加熱で、特定部分を均一な温度に加熱することを可能とする、熱処理部材の部分熱処理方法とその装置を提供することにある。
本発明の第２の目的は、部分熱処理の冷却工程において、熱処理硬さ不足、熱処理硬さ不均一、および熱処理割れ等の品質不良の発生を防止し、かつ、設備関連コストの低減を可能とする、熱処理部材の部分熱処理方法とその装置を提供することにある。
本発明の第３の目的は、部分熱処理の加熱工程において、短時間の加熱で、特定部分を均一な温度に加熱することを可能とし、部分熱処理の冷却工程において、熱処理硬さ不足、熱処理硬さ不均一、および熱処理割れ等の品質不良の発生を防止し、かつ、設備関連コストの低減を可能とする、熱処理部材の部分熱処理方法とその装置を提供することにある。
【００１１】
【課題を解決するための手段】
上記目的は以下の本発明によって達成される。
（１）熱処理部材の特定部分のみを熱処理する部分熱処理方法であって、
前記熱処理は、前記特定部分のみを誘導加熱する誘導加熱工程と、ついで行われる冷却工程とを含んでおり、
前記誘導加熱工程が、第１段階の加熱と、該第１段階の加熱に続く加熱休止と、該加熱休止に続く第２段階の加熱を含んでいる、
熱処理部材の部分熱処理方法。
（２）前記第１段階の加熱の加熱出力は前記第２段階の加熱の加熱出力と等しいかそれよりも高く設定されている（１）記載の熱処理部材の部分熱処理方法。
（３）前記熱処理部材の特定部分の加熱中、前記熱処理部材を固定する（１）記載の熱処理部材の部分熱処理方法。
（４）１つの加熱コイルが１つの熱処理部材を加熱する（１）記載の熱処理部材の部分熱処理方法。
（５）前記第１段階の加熱と前記第２段階の加熱を別個の加熱コイルを用いて行う（４）記載の熱処理部材の部分熱処理方法。
（６）前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルが互いに異なる形状を有している（５）記載の熱処理部材の部分熱処理方法。
（７）前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルは同一の形状を有している（５）記載の熱処理部材の部分熱処理方法。
（８）前記第１段階の加熱と前記第２段階の加熱を同じ加熱コイルを用いて行う（４）記載の熱処理部材の部分熱処理方法。
（９）１つの加熱コイルが熱処理部材を２つ加熱する（１）記載の熱処理部材の部分熱処理方法。
（１０）前記冷却工程では、前記熱処理部材の全体を冷却液槽内の冷却液中の定位置に浸漬して静止させる（１）記載の熱処理部材の部分熱処理方法。
（１１）前記冷却工程では、噴射ジャケットより流出する冷却液流を前記特定部分に噴射する（１）記載の熱処理部材の部分熱処理方法。
（１２）前記熱処理部材が無限軌道帯用リンクである（１）記載の熱処理部材の部分熱処理方法。
（１３）前記特定部分が前記リンクのローラー踏面部である（１２）記載の熱処理部材の部分熱処理方法。
（１４）前記熱処理が部分焼入れである（１）記載の熱処理部材の部分熱処理方法。
（１５）前記熱処理が部分焼もどしである（１）記載の熱処理部材の部分熱処理方法。
（１６）前記熱処理が部分焼入れと部分焼もどしである（１）記載の熱処理部材の部分熱処理方法。
（１７）熱処理部材の特定部分のみを熱処理する部分熱処理装置であって、
前記特定部分のみを誘導加熱する誘導加熱装置と、前記特定部分が加熱された熱処理部材を冷却する冷却装置とを含んでおり、
前記誘導加熱装置が、第１段階の加熱、加熱休止、第２段階の加熱を順に行う１つ以上の加熱コイルを有している、
熱処理部材の部分熱処理装置。
（１８）前記第１段階の加熱の加熱出力を前記第２段階の加熱の加熱出力と等しいかそれ以上に設定可能である（１７）記載の熱処理部材の部分熱処理装置。
（１９）前記熱処理部材の特定部分の加熱中、前記熱処理部材を固定するクランプ装置を備えている（１７）記載の熱処理部材の部分熱処理装置。
（２０）１つの加熱コイルが１つの熱処理部材を加熱する（１７）記載の熱処理部材の部分熱処理装置。
（２１）前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルが別個になっている（２０）記載の熱処理部材の部分熱処理装置。
（２２）前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルが互いに異なる形状を有している（２１）記載の熱処理部材の部分熱処理装置。
（２３）前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルが同一の形状を有している（２１）記載の熱処理部材の部分熱処理装置。
（２４）前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルが同一である（２０）記載の熱処理部材の部分熱処理装置。
（２５）１つの加熱コイルが熱処理部材を２つ加熱する（１７）記載の熱処理部材の部分熱処理装置。
（２６）前記冷却装置が、搬送される前記熱処理部材を冷却液槽内の冷却液中の定位置に浸漬して静止させるローラーコンベヤーを備えている（１７）記載の熱処理部材の部分熱処理装置。
（２７）前記冷却装置が、流出する冷却液流を前記特定部分に噴射する噴射ジャケットを備えている（１７）記載の熱処理部材の部分熱処理装置。
（２８）前記熱処理部材が無限軌道帯用リンクである（１７）記載の熱処理部材の部分熱処理装置。
（２９）前記特定部分が前記リンクのローラー踏面部である（２８）記載の熱処理部材の部分熱処理装置。
（３０）前記熱処理が部分焼入れである（１７）記載の熱処理部材の部分熱処理装置。
（３１）前記熱処理が部分焼もどしである（１７）記載の熱処理部材の部分熱処理装置。
（３２）前記熱処理が部分焼入れと部分焼もどしである（１７）記載の熱処理部材の部分熱処理装置。
【００１２】
上記（１）の部分熱処理方法および上記（１７）の部分熱処理装置では、加熱工程において、誘導加熱が２段階の加熱で行われ、１段目の加熱と２段目の加熱との間に加熱休止時間を設けたので、１段目の加熱で特定部分の表面に偏在した熱が芯部に伝導して表面と芯部との温度差が減少し、熱処理部材の特定部分全体を均一な温度に加熱することができる。
上記（２）の部分熱処理方法および上記（１８）の部分熱処理装置では、２段目の加熱は１段目の加熱と等しいかまたはそれより低い出力での加熱のため、表面と芯部との温度差がさらに減少し、その結果、熱処理部材の特定部分全体を均一な温度に加熱することができる。
上記（３）の部分熱処理方法および上記（１９）の部分熱処理装置では、熱処理部材の特定部分の加熱中、熱処理部材を固定するので、熱処理部材が加熱コイルに対して変位せず、特定部分を所定深さで所定温度に加熱することができる。
上記（４）〜（７）の部分熱処理方法および上記（２０）〜（２３）の部分熱処理装置では、ワークを第１段階の加熱の加熱コイル（第１加熱コイル）で加熱し、加熱休止中にワークを第２段階の加熱の加熱コイル（第２加熱コイル）に送り、ワークを第２加熱コイルで加熱するが、ワークを第２加熱コイルで加熱中につぎのワークを第１加熱コイルで加熱することができ、生産性の向上をはかることができる。
上記（８）の部分熱処理方法およびおよび上記（２４）の部分熱処理装置では、同じ（単一の）加熱コイルで、第１段階の加熱、加熱休止、第２段階の加熱を行うので、加熱コイルの数量が削減され、その結果、加熱コイルの製作費用が削減される。
上記（９）の部分熱処理方法および上記（２５）の部分熱処理装置では、ワークを１つの加熱コイルの上流部で加熱し、加熱休止中にワークを前記１つの加熱コイルの下流部に送り、ワークを加熱コイルの下流部で加熱するが、ワークを加熱コイルの下流部で加熱中につぎのワークを加熱コイルの上流部で加熱することができ、生産性を倍増することができる。
上記（１０）の部分熱処理方法および上記（２６）の部分熱処理装置では、とりわけ、冷却工程で、熱処理部材の全体を冷却液槽内の冷却液中の定位置に浸漬して静止させるので、特定部分を狙って冷却液を噴射でき、熱処理の品質を向上できる。また、ワーク搬送方向に熱処理装置がコンパクトになり、設備関連コストを低減することができる。
上記（１１）の部分熱処理方法および上記（２７）の部分熱処理装置では、とりわけ、冷却工程で、噴射ジャケットより流出する冷却液流を特定部分に噴射するので、十分な冷却能力が確保されるとともに、冷却が均一になり、熱処理の品質を向上できる。
上記（１２）、（１３）の部分熱処理方法および上記（２８）、（２９）の部分熱処理装置では、本発明を無限軌道帯用リンクのローラー踏面に適用して、機械的品質の向上をはかることができる。
上記（１４）〜（１６）の部分熱処理方法および上記（３０）〜（３２）の部分熱処理装置では、熱処理は、部分焼入れであってもよいし、部分焼もどしであってもよいし、部分焼入れと部分焼もどしの両方であってもよい。
【００１３】
【発明の実施の形態】
以下に、本発明の熱処理部材の部分熱処理方法とその装置を、図１〜図１４（図１２〜図１４は従来技術の説明と共用）を参照して説明する。
熱処理部材１として、建設機械の無限軌道帯用リンクを例にとる。ただし、熱処理部材は建設機械の無限軌道帯用リンクに限るものではない。また、熱処理部材１が建設機械の無限軌道帯用リンク１である場合、熱処理が施される特定部分１ａはローラー踏面部である。
【００１４】
まず、本発明の熱処理部材の部分熱処理方法を説明する。
図１に示すように、本発明の熱処理部材の部分熱処理方法は、熱処理部材１の特定部分１ａのみを熱処理する部分熱処理方法である。
本発明の熱処理部材の部分熱処理方法は、熱処理部材１の特定部分１ａのみを誘導加熱する誘導加熱工程２０と、ついで行われる冷却工程３０を含む。誘導加熱では、高周波誘導電流により特定部分１ａのみを局部的に加熱する。
誘導加熱工程２０において、本発明方法による誘導加熱工程に符号２０Ｐを付し、従来方法による誘導加熱工程に符号２０Ｃを付す。
【００１５】
本発明の誘導加熱工程２０Ｐは、第１段階の加熱２１と、該第１段階の加熱に続く加熱休止２２と、該加熱休止に続く第２段階の加熱２３を有している。すなわち、第１段階の加熱２１と第２段階の加熱２３との２段階の加熱の間に加熱休止（放熱時間）２２が設けられている。加熱休止（放熱時間）２２は約５〜１５秒程度である。本発明の２段階の加熱では、第１段階の加熱２１の加熱出力が第２段階の加熱２３の加熱出力と等しいかそれよりも高く設定されている。
【００１６】
第１段階の加熱２１で熱処理部材１の特定部分１ａを急速加熱し、ほぼ所定の温度まで上昇させる。第１段階の加熱２１の加熱終了後では、加熱コイル１１に近い熱処理部材１の特定部分１ａの表面近傍部の加熱温度は加熱コイル１１と離れている特定部分１ａの芯部の温度と比較して高くなっている。すなわち、第１段階の加熱２１の加熱終了後では、熱処理部材１には比較的大きな温度差を有する温度分布（温度ムラ）があり、特定部分１ａにおいても表面部と芯部とで温度差がある。
つぎに、第１段階の加熱２１と第２段階の加熱２３との間の加熱休止（放熱時間）２２において、特定部分１ａの表面近傍部から大気への熱放散と、特定部分１ａの表面部から特定部分１ａの芯部への熱伝導とにより、特定部分１ａにおける温度ムラが減少し、特定部分１ａを均熱化することができる。
さらに、第２段階の加熱２３で、第１段階の加熱２１の加熱に比べて加熱出力を同一もしくは低くし、かつ、加熱コイル１１の形状も均熱化しやすいコイル形状とすることで、熱処理部材１の特定部分１ａをより均熱化することができる。
【００１７】
２段加熱とその間の放熱時間により、従来存在した温度ムラがほとんどなくなり、焼入れ硬さや焼もどし硬さなど、製品の品質が安定する。また、加熱時間も各段（第１段階の加熱も第２段階の加熱もそれぞれ）３０〜６０秒程度と短く、加熱休止も約５〜１５秒程度と短く、炉加熱による焼もどしのような３〜４時間といった長時間の処理は不要となる。
【００１８】
図９に示すように、熱処理部材１の特定部分１ａの加熱中、熱処理部材１をクランプ装置１２によって固定する。また、加熱中、熱処理部材１は搬送されず、静止している。クランプによって、誘導加熱コイル（単に、加熱コイルともいう）１１と熱処理部材１との位置関係が固定され、特定部分１ａの安定した加熱が行われる。
【００１９】
誘導加熱においては、１つの加熱コイル１１が１つの熱処理部材１を加熱してもよいし（図５）、加熱コイル１１を長くしておいて１つの加熱コイル１１が２つの熱処理部材１を加熱してもよい（図６）。
【００２０】
１つの加熱コイル１１が１つの熱処理部材１を加熱する場合、第１段階の加熱２１と第２段階の加熱２３を別々の加熱コイル１１を用いて行ってもよい。その場合は、加熱コイル１１は２セットとなる（図５）。
【００２１】
第１段階の加熱２１と第２段階の加熱２３を別々の加熱コイル１１を用いて行う場合、第１段階の加熱２１で用いる加熱コイル１１（図７）と第２段階の加熱２３で用いる加熱コイル１１（図８）の形状が異なってもよいし、あるいは、第１段階の加熱２１で用いる加熱コイルと第２段階の加熱２３で用いる加熱コイルの形状が同じであってもよい。また、この場合は、熱処理部材１の、第１段階の加熱２１の加熱コイル１１（図７）から第２段階の加熱２２の加熱コイル１１への搬送（移動）時間が加熱休止時間（放熱時間）２２になる。
【００２２】
１つの加熱コイル１１が１つの熱処理部材１を加熱する場合、第１段階の加熱２１と第２段階の加熱２３を同一の（単一の）加熱コイル１１を用いて行ってもよい。その場合は、加熱コイル１１は１セットとなる。
加熱コイル１１が１セットの場合、ハード面で、１段目加熱用タイマー、放冷用タイマー、２段目加熱用タイマー、および、１段目加熱出力、２段目加熱出力をそれぞれ設定し、ソフト面で、それぞれを規定時間ずつ順に動作させる。ただし、この方法は、均熱化が同一加熱コイルで得られる場合にのみ適用される。
【００２３】
１つの加熱コイル１１が２つの熱処理部材１を加熱する場合は（図６）、熱処理部材１を１つの加熱コイル１１の上流部１１ａで加熱し、加熱休止２２中に熱処理部材１を加熱コイル１１の上流部１１ａから加熱コイル１１の下流部１１ｂに送り、熱処理部材１を加熱コイル１１の下流部１１ｂで加熱する。この場合は、当然のことながら、１段目の加熱出力と２段目の加熱出力は、同一である。また、１段目の加熱時間と２段目の加熱時間も同一である。さらに、ハード面、ソフト面で、加熱休止時間において、加熱電源が切れると同時にクランプ装置１２が解除されて熱処理部材１がコイル１１の上流部１１ａからコイル１１の下流部１１ｂへ移動し始め、熱処理部材１がコイル１１の下流部１１ｂの所定位置に到達すると同時にクランプ装置１２が作動して熱処理部材１をコイル１１の下流部１１ｂの所定位置に固定するとともに、加熱電源が入って第２段階の加熱２３が開始されるようにする。こうすることにより、熱処理部材１を加熱コイル１１の下流部１１ｂで加熱中につぎの熱処理部材１を加熱コイル１１の上流部１１ａで加熱することができ、生産性を倍増することができる。すなわち、同じ時間で２倍の数の熱処理部材１を処理することができる。
【００２４】
冷却工程３０では、とりわけ部分熱処理が部分焼入れの場合（ただし、部分熱処理が部分焼もどしの場合に適用してもよい）、図１０、図１１に示すように、加熱工程２０で特定部分１ａのみが所定温度以上に誘導加熱された熱処理部材１の全体を、冷却液槽５内の冷却液６中の定位置に浸漬して静止させたまま、噴射ジャケット７の噴射穴より流出する冷却液流８を特定部分１ａに噴射し、冷却する。
【００２５】
熱処理部材１が、冷却液槽５の上方位置にある該部材１を搬送するローラーコンベヤー９の一部のローラー１０の上に搬送されて来た時に、一部のローラー１０および噴射ジャケット７ごと熱処理部材１の全体を冷却液槽５内の冷却液６中に機械的に浸漬し、なおかつ、噴射ジャケット７より大量の冷却液を３方向（左右２方向および上方）から流出させて熱処理部材１の特定部分１ａに噴射し、浸漬および液流により冷却する。冷却が完了すると、熱処理部材１を一部のローラー１０および噴射ジャケット７ごと下降前の位置に上昇させ、ついで搬出する。冷却および搬入・搬出のすべての工程は、自動制御で行われる。
焼入れに用いる冷却液としては、水、水溶性焼入れ液、油等があり、いずれの冷却液を用いてもよい。コスト面および作業環境面からは、水を使用することが望ましい。
【００２６】
浸漬および液流により冷却することで、十分な冷却速度を確保するとともに、均一な冷却を確保する。冷却速度を十分確保することで、必要な品質（焼入れ硬さ、焼もどし硬さなど）が得られ、かつ、冷却速度を均一とすることで、焼割れ防止をはかることができる。また、熱処理部材１を冷却液槽５内の冷却液６中の定位置に静止させて冷却するので、熱処理部材１が冷却中に冷却液槽を移動する冷却方法に比べて、噴射ジャケット７と熱処理部材１の干渉がなくなり、噴射ジャケット７の噴射穴と熱処理部材１との間隔を短くとることができるようになるので、噴射液流の流れが弱まらず、十分な速度の液流を噴射することができ、高い冷却速度を確保することができるので、必要な品質が得られる。また、熱処理部材１を静止させて冷却するので、熱処理部材１が冷却中に冷却液槽を移動する冷却方法に比べて、冷却液槽５の、熱処理部材１の搬送方向の長さが短縮され、設備製作費、設備ランニングコストが低減する。
【００２７】
本発明の第１段階の加熱２１、加熱休止２２、第２段階の加熱２３の加熱工程２０Ｐを有する本発明の部分熱処理は、部分焼入れに適用されてもよいし（図３）、または部分焼もどしに適用されてもよいし（図２）、または部分焼入れおよび部分焼もどしの両方に適用されてもよい（図４）。
【００２８】
図２の本発明の部分熱処理方法（本発明の部分加熱２０Ｐが焼もどしの部分加熱に適用された場合）は、部分焼入れ工程１００と部分焼もどし工程２００とを有する。
部分焼入れ工程１００は、熱処理部材１の特定部分１ａのみをＡｃ_３変態点以上の温度に誘導加熱する工程２０Ｃと、特定部分のみがＡｃ_３変態点以上の温度に誘導加熱された熱処理部材１の全体を冷却液槽５内の冷却液６中の定位置に浸漬して静止させたまま、噴射ジャケット７の噴射穴より流出する冷却液流８を特定部分１ａに噴射する冷却工程３０を有する。
部分焼もどし工程２００は、熱処理部材１の特定部分１ａのみを大気中で約２００〜３００℃の温度に誘導加熱する誘導加熱工程２０Ｐと、冷却工程（強制冷却でも自然冷却であってもよい）３０を含む。この部分焼もどし工程の誘導加熱工程２０Ｐは、第１段階の加熱２１と、第１段階の加熱２１に続く加熱休止（放熱時間）２２と、該加熱休止２２に続く第２段階の加熱２３とを有する。
【００２９】
図３の本発明の部分熱処理方法（本発明の部分加熱２０Ｐが焼入れの部分加熱に適用された場合）は、部分焼入れ工程１００と部分焼もどし工程２００とを有する。
部分焼入れ工程１００は、熱処理部材１の特定部分１ａのみをＡｃ_３変態点以上の温度に誘導加熱する工程２０Ｐと、特定部分のみがＡｃ_３変態点以上の温度に誘導加熱された熱処理部材１の全体を冷却液槽５内の冷却液６中の定位置に浸漬して静止させたまま、噴射ジャケット７の噴射穴より流出する冷却液流８を特定部分１ａに噴射する冷却工程３０を有する。この部分焼入れ工程の誘導加熱工程２０Ｐは、第１段階の加熱２１と、第１段階の加熱２１に続く加熱休止（放熱時間）２２と、該加熱休止２２に続く第２段階の加熱２３とを有する。
部分焼もどし工程２００は、熱処理部材１の特定部分１ａのみを大気中で約２００〜３００℃の温度に誘導加熱する誘導加熱工程２０Ｃと、冷却工程（強制冷却でも自然冷却であってもよい）３０を含む。
【００３０】
図４の本発明の部分熱処理方法（本発明の部分加熱２０Ｐが焼入れの部分加熱と焼もどしの部分加熱の両方に適用された場合）は、部分焼入れ工程１００と部分焼もどし工程２００とを有する。
部分焼入れ工程１００は、熱処理部材１の特定部分１ａのみをＡｃ_３変態点以上の温度に誘導加熱する工程２０Ｐと、特定部分のみがＡｃ_３変態点以上の温度に誘導加熱された熱処理部材１の全体を冷却液槽５内の冷却液６中の定位置に浸漬して静止させたまま、噴射ジャケット７の噴射穴より流出する冷却液流８を特定部分１ａに噴射する冷却工程３０を有する。この部分焼入れ工程の誘導加熱工程２０Ｐは、第１段階の加熱２１と、第１段階の加熱２１に続く加熱休止（放熱時間）２２と、該加熱休止２２に続く第２段階の加熱２３とを有する。
部分焼もどし工程２００は、熱処理部材１の特定部分１ａのみを大気中で約２００〜３００℃の温度に誘導加熱する誘導加熱工程２０Ｐと、冷却工程（強制冷却でも自然冷却であってもよい）３０を含む。この部分焼もどし工程の誘導加熱工程２０Ｐは、第１段階の加熱２１と、第１段階の加熱２１に続く加熱休止（放熱時間）２２と、該加熱休止２２に続く第２段階の加熱２３とを有する。
【００３１】
つぎに、上記の部分熱処理方法を実施する、本発明の部分熱処理装置を、図５〜図１４を参照して説明する。
本発明の部分熱処理装置は、熱処理部材１の特定部分１ａのみを熱処理する部分熱処理装置であって、特定部分１ａのみを誘導加熱する誘導加熱装置（誘導加熱コイル１１を含む）と、特定部分１ａが加熱された熱処理部材１を冷却する冷却装置５〜１０とを含んでいる。誘導加熱装置は、第１段階の加熱２１、加熱休止２２、第２段階の加熱２３を順に行う１つ以上の加熱コイル１１を有している。
【００３２】
第１段階の加熱２１の加熱出力は第２段階の加熱２３の加熱出力と同一もしくはそれ以上に設定可能である。
部分熱処理装置は、熱処理部材１の特定部分１ａの加熱中、熱処理部材１を固定するクランプ装置１２を備えている。
１つの加熱コイル１１が１つの熱処理部材１を加熱してもよい（図５）。
１つの加熱コイル１１が１つの熱処理部材１を加熱する場合は、第１段階の加熱２１を行う加熱コイル１１と第２段階の加熱２３を行う加熱コイル１１は別々の加熱コイルであってもよいし、同じ（単一の）加熱コイル１１であってもよい。
第１段階の加熱２１を行う加熱コイル１１と第２段階の加熱２３を行う加熱コイル１１が別個の加熱コイルである場合は、第１段階の加熱２１を行う加熱コイル１１と第２段階の加熱２３を行う加熱コイル１１が互いに異なる形状を有していてもよいし、同一の形状を有していてもよい。
１つの加熱コイル１１が熱処理部材１を２つ加熱するものであってもよい（図６）。
【００３３】
冷却装置は、搬送される熱処理部材１を冷却液槽５内の冷却液６中の定位置に浸漬して静止させるローラーコンベヤー１０を備えている。
冷却装置は、流出する冷却液流８を熱処理部材１の特定部分１ａに噴射する噴射ジャケット７を備えている。
熱処理部材１は、たとえば、無限軌道帯用リンクである。熱処理部材１が無限軌道帯用リンクである場合、特定部分１ａはリンクのローラー踏面部である。
部分熱処理は、部分焼入れであってもよいし、部分焼もどしであってもよいし、部分焼入れと部分焼もどしの両方であってもよい。
【００３４】
【発明の効果】
請求項１の部分熱処理方法および請求項１７の部分熱処理装置によれば、加熱工程において、誘導加熱が２段階の加熱で行われ、１段目の加熱と２段目の加熱との間に加熱休止時間を設けたので、熱処理部材の特定部分全体を均一な温度に加熱することができる。
請求項２の部分熱処理方法および請求項１８の部分熱処理装置によれば、２段目の加熱は１段目の加熱と同一またはそれより低い出力での加熱のため、熱処理部材の特定部分全体を均一な温度に加熱することができる。
請求項３の部分熱処理方法および請求項１９の部分熱処理装置によれば、加熱中、熱処理部材を固定するので、特定部分を所定深さで所定温度に加熱でき、熱処理部材の品質が向上する。
請求項４〜７の部分熱処理方法および請求項２０〜２３の部分熱処理装置によれば、生産性を高めることができる。
請求項８の部分熱処理方法および請求項２４の部分熱処理装置によれば、加熱コイルの数量が削減され、その結果、加熱コイルの製作費用が削減される。
請求項９の部分熱処理方法および請求項２５の部分熱処理装置によれば、生産性を倍増することができる。
請求項１０の部分熱処理方法および請求項２６の部分熱処理装置によれば、冷却工程で、熱処理部材の全体を冷却液槽内の冷却液中の定位置に浸漬して静止させるので、特定部分を狙って噴射でき、熱処理の品質の向上をはかることができる。また、ワーク搬送方向に熱処理装置がコンパクトになり、設備関連コストを低減することができる。
請求項１１の部分熱処理方法および請求項２７の部分熱処理装置によれば、とりわけ、焼入れ冷却工程で、噴射ジャケットより流出する冷却液流を特定部分に噴射するので、十分な冷却能力が確保されるとともに、冷却が均一になる。
請求項１２、１３の部分熱処理方法および請求項２８、２９の部分熱処理装置によれば、本発明を無限軌道帯用リンクのローラー踏面に適用することにより、機械的品質の向上をはかることができる。
請求項１４〜１６の部分熱処理方法および請求項３０〜３２の部分熱処理装置によれば、熱処理は、部分焼入れであってもよいし、部分焼もどしであってもよいし、部分焼入れと部分焼もどしの両方であってもよく、適用の自由度が高い。
【図面の簡単な説明】
【図１】本発明の熱処理部材の部分熱処理方法の工程図である。
【図２】本発明の熱処理部材の部分熱処理方法を、部分焼もどしに適用した場合の工程図である。
【図３】本発明の熱処理部材の部分熱処理方法を、部分焼入れに適用した場合の工程図である。
【図４】本発明の熱処理部材の部分熱処理方法を、部分焼入れと部分焼もどしの両方に適用した場合の工程図である。
【図５】本発明の熱処理部材の部分熱処理方法とその装置において、１つの加熱コイルで１つの熱処理部材を加熱する場合の加熱コイルの配置図（側面図）である。
【図６】本発明の熱処理部材の部分熱処理方法とその装置において、長めの１つの加熱コイルで２つの熱処理部材を加熱する場合の加熱コイルの配置図（側面図）である。
【図７】本発明の熱処理部材の部分熱処理方法とその装置において、焼もどしに係る部分の、第１段階の加熱の加熱コイルの断面図である。
【図８】本発明の熱処理部材の部分熱処理方法とその装置において、焼もどしに係る部分の、第２段階の加熱の加熱コイルの断面図である。
【図９】本発明の熱処理部材の部分熱処理方法とその装置において、クランプ装置と加熱コイルの平面図（上から見た図）である。
【図１０】本発明の熱処理部材の部分熱処理方法とその装置の、冷却（図は焼入れの冷却の場合を示す）に係る部分の断面図である。
【図１１】図１０の部分の横断面図である。
【図１２】建設機械の無限軌道帯の一部の斜視図である。
【図１３】図１２のうちリンクの正面図である。
【図１４】図１２のうちリンクの側面図である。
【符号の説明】
１熱処理部材（たとえば、建設機械の無限軌道帯用リンク）
１ａ特定部分（たとえば、建設機械の無限軌道帯用リンクのローラー踏面部）
５冷却液槽
６冷却液
７噴射ジャケット
８冷却液流
９ローラーコンベヤー
１０一部のローラー
１１加熱コイル
１２クランプ装置
２０誘導加熱工程
２０Ｐ第１段階の加熱、加熱休止、第２段階の加熱を有する本発明の誘導加熱工程
２０Ｃ一般の加熱工程
２１第１段階の加熱
２２加熱休止
２３第２段階の加熱
３０冷却工程
１００部分焼入れ工程
２００部分焼もどし工程[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a partial heat treatment method for a heat treatment member and an apparatus therefor.
The heat-treated member is, for example, an endless track link of a construction machine. In this case, the portion to be partially heat-treated is a roller tread portion. However, the heat treatment member is not limited to the endless track link of the construction machine.
The partial heat treatment is either partial quenching or partial tempering, or partial quenching and partial tempering.
[0002]
[Prior art]
Some steel members are used as they are rolled, forged, or cast, but members requiring wear resistance (hardness), strength, and toughness are subjected to heat treatment. Such a member that has been subjected to the heat treatment is referred to as a “heat treated member”.
As typical heat treatment members, as shown in FIG. 12, a construction machine such as a hydraulic excavator and a bulldozer, and a construction machine such as a track plate 2, a link 1, a pin 3, a bush 4, and a bulldozer and a snow removal machine used in an endless track zone of the construction machine. And the like (not shown). In addition, many of the machine structural parts used in various industrial machines are heat-treated members.
Since the link for the endless track belt is used under severe conditions, the link as a whole is required to have wear resistance, strength and toughness. In addition, abrasion resistance is particularly required for the roller tread portion 1a (FIGS. 13 and 14) of the link 1, which is a contact surface region with a roller (roller, not shown) of the lower traveling body of the construction machine. You.
[0003]
In order to provide these required characteristics, the link for the endless track belt is manufactured in the following steps (1) to (5) in the order of (1) to (5).
(1) A material made of medium carbon alloy steel is hot forged to form a link material having a link shape.
(2) Ac by residual heat or reheating of hot forging ₃ The entire link material, which is at a temperature above the transformation point, is quenched and quenched.
(3) The entire hardened link material is tempered at high temperature.
{Circle around (4)} Induction hardening of only the roller tread of the high-temperature tempered link material (so-called partial quenching).
{Circle around (5)} Low temperature tempering of only the roller tread portion of the link material by induction heating (so-called partial tempering) or low temperature tempering of the entire link material in a furnace.
Before and after the steps (4) and (5), machining is performed to assemble with other parts.
[0004]
Therefore, the link material is subjected to a two-stage heat treatment, ie, a first-stage heat treatment of (2) and (3) and a second-stage heat treatment of (4) and (5). The first stage heat treatment is a heat treatment for imparting strength and toughness to the entire link, and the second stage heat treatment is a heat treatment for imparting wear resistance to the roller tread portion, which is a part of the link. The reason for performing the two-stage heat treatment is that the required mechanical properties are different depending on the part of the link. Here, the heat treatment applied to the entire link material, such as the first heat treatment, is referred to as “entire heat treatment”, and the heat treatment applied to a part of the link material, such as the second heat treatment, is referred to as “partial heat treatment”. .
[0005]
The present invention relates to the partial heat treatment step among the link production steps (1) to (5). That is, the present invention
(I) Both the step (4), ie, the partial quenching step, and the step (5), ie, the partial tempering step, or
(Ii) Step (4), that is, a partial quenching step, or
(Iii) Step (5), ie, a partial tempering step,
.
[0006]
Conventionally, the following methods are used for the partial heat treatment of the link material (partial quenching in (4) and partial tempering in (5)).
[Partial quenching]
I. Method of immersing the entire link material in the coolant in the coolant tank
B. A method of injecting a cooling liquid from an injection jacket in the air or liquid only to the roller tread portion of the link material while transporting the link material in the cooling tank (jet cooling, for example, Japanese Patent Application Laid-Open No. 58-167727) )
C. A method of injecting a coolant with high-pressure air in the atmosphere only on the roller tread of link material (high-pressure spray cooling)
[Partial tempering]
D. One-step induction heating method (for example, JP-A-57-51583)
E. In-furnace heating method (for example, description of a conventional technique in JP-A-57-51583)
[0007]
[Patent Document 1]
JP-A-58-167727
[Patent Document 2]
JP-A-57-51583
[0008]
[Problems to be solved by the invention]
However, the conventional partial heat treatment method has the following problems.
[Problems of conventional partial quenching method]
I. In the method (1), the entire link material is always in contact with the cooling liquid, but since there is no liquid flow, the cooling capacity is low, and the cooling tends to be uneven. As a result, quality defects such as insufficient quenching hardness (so-called incomplete quenching), uneven quenching hardness (so-called uneven squeezing), and quenching cracks are likely to occur.
B. In the method of (1), especially in the submerged injection, since the link moves in the cooling liquid, it is difficult to inject the cooling liquid flow to a portion to be cooled and to cool it effectively. In the case of a member having a complicated shape such as a link, the cooling tends to be uneven, and quality defects such as burning cracks are likely to occur.
C. In the method (1), a high-pressure injection device, a work clamper, a large-capacity liquid tank, a large-sized cover, and the like are required, so that the equipment becomes large, and the equipment manufacturing cost and the equipment maintenance cost increase.
[Problems of conventional partial tempering method]
D. In the method of (1), the temperature difference between the surface and the core of the specific portion becomes large, and it is difficult to heat the entire specific portion to a uniform temperature.
E. In the method (1), since the heating time is long, the tempering step becomes a bottleneck, and it is very difficult to perform in-line integrated production.
[0009]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a partial heat treatment method for a heat treated member (partial quenching method, or partial tempering method, or both partial quenching method and partial tempering method, which can solve one or more of the above problems of the conventional partial heat treatment. , Or any of them).
[0010]
More specifically, it is as follows.
A first object of the present invention is to provide a partial heat treatment method for a heat treatment member and a device therefor, which enable a specific portion to be heated to a uniform temperature with a short heating time in a heating step of the partial heat treatment. It is in.
A second object of the present invention is to prevent the occurrence of quality defects such as insufficient heat treatment hardness, non-uniform heat treatment hardness, and heat treatment cracks in the cooling step of partial heat treatment, and to reduce equipment-related costs. To provide a method and an apparatus for partial heat treatment of a heat treatment member.
A third object of the present invention is to make it possible to heat a specific portion to a uniform temperature by heating for a short time in the heating step of the partial heat treatment. It is an object of the present invention to provide a method and an apparatus for partially heat-treating a heat-treated member, which prevent non-uniformity and the occurrence of quality defects such as heat-treated cracks and reduce equipment-related costs.
[0011]
[Means for Solving the Problems]
The above object is achieved by the present invention described below.
(1) A partial heat treatment method in which only a specific portion of a heat treatment member is heat-treated,
The heat treatment includes an induction heating step of induction heating only the specific portion, and a cooling step performed subsequently,
Wherein the induction heating step includes a first stage heating, a heating pause following the first stage heating, and a second stage heating following the heating pause.
Partial heat treatment method for heat treated members.
(2) The partial heat treatment method of the heat treatment member according to (1), wherein the heating output of the first stage heating is set to be equal to or higher than the heating output of the second stage heating.
(3) The method for partial heat treatment of a heat treatment member according to (1), wherein the heat treatment member is fixed during heating of a specific portion of the heat treatment member.
(4) The method according to (1), wherein one heating coil heats one heat treatment member.
(5) The method according to (4), wherein the first-stage heating and the second-stage heating are performed using separate heating coils.
(6) The method according to (5), wherein the heating coil for performing the first-stage heating and the heating coil for performing the second-stage heating have different shapes from each other.
(7) The partial heat treatment method for a heat treatment member according to (5), wherein the heating coil for performing the first stage heating and the heating coil for performing the second stage heating have the same shape.
(8) The method according to (4), wherein the first stage heating and the second stage heating are performed using the same heating coil.
(9) The method according to (1), wherein one heating coil heats two heat treatment members.
(10) In the cooling step, the partial heat treatment method of the heat treatment member according to (1), wherein the entirety of the heat treatment member is immersed in a fixed position in a cooling liquid in a cooling liquid tank and stopped.
(11) The partial heat treatment method for a heat treatment member according to (1), wherein, in the cooling step, a coolant flow flowing out from an injection jacket is injected to the specific portion.
(12) The partial heat treatment method for a heat treatment member according to (1), wherein the heat treatment member is an endless track link.
(13) The method according to (12), wherein the specific portion is a roller tread portion of the link.
(14) The method according to (1), wherein the heat treatment is partial quenching.
(15) The method according to (1), wherein the heat treatment is partial tempering.
(16) The method according to (1), wherein the heat treatment is partial quenching and partial tempering.
(17) A partial heat treatment apparatus for heat treating only a specific portion of a heat treatment member,
Induction heating device for induction heating only the specific portion, and a cooling device for cooling the heat treatment member where the specific portion is heated,
The induction heating device has one or more heating coils that sequentially perform first-stage heating, heating pause, and second-stage heating,
Partial heat treatment equipment for heat treatment members.
(18) The partial heat treatment apparatus for a heat treatment member according to (17), wherein a heating output of the first-stage heating can be set to be equal to or more than a heating output of the second-stage heating.
(19) The partial heat treatment device for a heat treatment member according to (17), further including a clamp device for fixing the heat treatment member during heating of a specific portion of the heat treatment member.
(20) The partial heat treatment apparatus for a heat treatment member according to (17), wherein one heating coil heats one heat treatment member.
(21) The partial heat treatment apparatus for a heat treatment member according to (20), wherein a heating coil for performing the first stage heating and a heating coil for performing the second stage heating are separate.
(22) The partial heat treatment apparatus for a heat treatment member according to (21), wherein the heating coil that performs the first-stage heating and the heating coil that performs the second-stage heating have different shapes.
(23) The partial heat treatment apparatus for a heat treatment member according to (21), wherein the heating coil that performs the first-stage heating and the heating coil that performs the second-stage heating have the same shape.
(24) The partial heat treatment apparatus for a heat treatment member according to (20), wherein a heating coil that performs the first stage heating and a heating coil that performs the second stage heating are the same.
(25) The partial heat treatment apparatus for a heat treatment member according to (17), wherein one heating coil heats two heat treatment members.
(26) The partial heat treatment apparatus for a heat treatment member according to (17), wherein the cooling device includes a roller conveyor for dipping the conveyed heat treatment member at a fixed position in a cooling liquid in a cooling liquid tank and stopping the roller.
(27) The partial heat treatment device for a heat treatment member according to (17), wherein the cooling device includes an injection jacket that injects the outflowing coolant flow to the specific portion.
(28) The partial heat treatment apparatus for a heat treatment member according to (17), wherein the heat treatment member is a link for an endless track belt.
(29) The partial heat treatment apparatus for a heat treatment member according to (28), wherein the specific portion is a roller tread portion of the link.
(30) The partial heat treatment apparatus for a heat treatment member according to (17), wherein the heat treatment is partial quenching.
(31) The partial heat treatment apparatus for a heat treated member according to (17), wherein the heat treatment is partial tempering.
(32) The partial heat treatment apparatus for a heat treated member according to (17), wherein the heat treatment is partial quenching and partial tempering.
[0012]
In the partial heat treatment method of (1) and the partial heat treatment apparatus of (17), in the heating step, induction heating is performed in two stages of heating, and heating is performed between the first stage heating and the second stage heating. Since the pause time is provided, the heat unevenly distributed on the surface of the specific portion by the first stage heating is conducted to the core portion, and the temperature difference between the surface and the core portion is reduced. Can be heated.
In the partial heat treatment method of the above (2) and the partial heat treatment apparatus of the above (18), the heating of the second stage is performed at an output equal to or lower than that of the first stage, so that the surface and the core are not heated. The temperature difference is further reduced, so that the entire specified portion of the heat-treated member can be heated to a uniform temperature.
In the partial heat treatment method of (3) and the partial heat treatment apparatus of (19), since the heat treatment member is fixed during heating of the specific portion of the heat treatment member, the heat treatment member is not displaced with respect to the heating coil. It can be heated to a predetermined temperature at a predetermined depth.
In the partial heat treatment method of (4) to (7) and the partial heat treatment apparatus of (20) to (23), the work is heated by the first-stage heating coil (first heating coil), and the heating is stopped. The work is sent to a heating coil (second heating coil) for the second stage heating, and the work is heated by the second heating coil. While the work is heated by the second heating coil, the next work is heated by the first heating coil. Heating can be performed, and productivity can be improved.
In the partial heat treatment method (8) and the partial heat treatment apparatus (24), the same (single) heating coil performs the first-stage heating, the heating pause, and the second-stage heating. Is reduced, and as a result, the manufacturing cost of the heating coil is reduced.
In the partial heat treatment method of (9) and the partial heat treatment apparatus of (25), the work is heated at an upstream portion of one heating coil, and the work is sent to a downstream portion of the one heating coil during heating pause. Is heated at the downstream portion of the heating coil, but the next work can be heated at the upstream portion of the heating coil while the work is heated at the downstream portion of the heating coil, so that productivity can be doubled.
In the partial heat treatment method of the above (10) and the partial heat treatment apparatus of the above (26), in particular, in the cooling step, the entire heat treatment member is immersed in a fixed position in the cooling liquid in the cooling liquid tank and is stopped. The coolant can be sprayed at the part, and the quality of the heat treatment can be improved. In addition, the heat treatment apparatus becomes compact in the direction of transporting the work, and equipment-related costs can be reduced.
In the partial heat treatment method of (11) and the partial heat treatment apparatus of (27), in particular, in the cooling step, the cooling liquid flowing out from the injection jacket is injected to the specific portion, so that sufficient cooling capacity is ensured. The cooling becomes uniform, and the quality of the heat treatment can be improved.
In the partial heat treatment methods (12) and (13) and the partial heat treatment devices (28) and (29), the present invention is applied to the roller tread of the link for the endless track belt to improve mechanical quality. be able to.
In the partial heat treatment methods (14) to (16) and the partial heat treatment apparatuses (30) to (32), the heat treatment may be partial quenching, partial tempering, or partial heat treatment. Both quenching and partial tempering may be used.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a partial heat treatment method and an apparatus for the heat treatment member according to the present invention will be described with reference to FIGS. 1 to 14 (FIGS. 12 to 14 are shared with the description of the prior art).
As the heat treatment member 1, an endless track link of a construction machine is taken as an example. However, the heat treatment member is not limited to the endless track link of the construction machine. When the heat treatment member 1 is the endless track link 1 of the construction machine, the specific portion 1a to be subjected to the heat treatment is a roller tread portion.
[0014]
First, a partial heat treatment method for a heat treatment member according to the present invention will be described.
As shown in FIG. 1, the partial heat treatment method of the heat treatment member of the present invention is a partial heat treatment method in which only a specific portion 1 a of the heat treatment member 1 is heat treated.
The partial heat treatment method of the heat treatment member of the present invention includes an induction heating step 20 for inductively heating only a specific portion 1a of the heat treatment member 1, and a cooling step 30 to be performed. In the induction heating, only the specific portion 1a is locally heated by the high-frequency induction current.
In the induction heating step 20, the induction heating step according to the method of the present invention is denoted by reference numeral 20P, and the induction heating step according to the conventional method is denoted by reference numeral 20C.
[0015]
The induction heating step 20P of the present invention includes a first stage heating 21, a heating pause 22 following the first stage heating, and a second stage heating 23 following the heating pause. That is, a heating pause (radiation time) 22 is provided between the two-stage heating of the first-stage heating 21 and the second-stage heating 23. The heating pause (radiation time) 22 is about 5 to 15 seconds. In the two-stage heating of the present invention, the heating output of the first stage heating 21 is set to be equal to or higher than the heating output of the second stage heating 23.
[0016]
In the first stage of heating 21, the specific portion 1a of the heat treatment member 1 is rapidly heated to almost a predetermined temperature. After the completion of the heating of the first stage heating 21, the heating temperature in the vicinity of the surface of the specific portion 1 a of the heat treatment member 1 close to the heating coil 11 is compared with the temperature of the core of the specific portion 1 a distant from the heating coil 11. It is high. That is, after the end of the heating of the first stage heating 21, the heat treatment member 1 has a temperature distribution (temperature unevenness) having a relatively large temperature difference, and the temperature difference between the surface portion and the core portion also in the specific portion 1a. is there.
Next, in a heating pause (radiation time) 22 between the first stage heating 21 and the second stage heating 23, heat is radiated from the vicinity of the surface of the specific portion 1a to the atmosphere, and the surface portion of the specific portion 1a is heated. From the heat conduction to the core of the specific portion 1a, the temperature unevenness in the specific portion 1a is reduced, and the specific portion 1a can be uniformly heated.
Furthermore, the heating power in the second stage heating 23 is the same or lower than the heating in the first stage heating 21 and the shape of the heating coil 11 is made into a coil shape that is easy to be uniform, so that the heat treatment member is formed. The specific portion 1a can be further soaked.
[0017]
Due to the two-stage heating and the heat radiating time between them, the temperature unevenness conventionally existing is almost eliminated, and the quality of the product such as quenching hardness and tempering hardness is stabilized. In addition, the heating time is as short as about 30 to 60 seconds in each stage (both the first stage heating and the second stage heating), and the heating pause is as short as about 5 to 15 seconds, such as tempering by furnace heating. A long process such as 3 to 4 hours is not required.
[0018]
As shown in FIG. 9, during the heating of the specific portion 1 a of the heat treatment member 1, the heat treatment member 1 is fixed by the clamp device 12. Further, during the heating, the heat treatment member 1 is not conveyed and is stationary. The positional relationship between the induction heating coil (also simply referred to as a heating coil) 11 and the heat treatment member 1 is fixed by the clamp, and the specific portion 1a is stably heated.
[0019]
In the induction heating, one heating coil 11 may heat one heat treatment member 1 (FIG. 5), or one heating coil 11 heats two heat treatment members 1 while keeping the heating coil 11 long. (FIG. 6).
[0020]
When one heating coil 11 heats one heat treatment member 1, the first stage heating 21 and the second stage heating 23 may be performed using different heating coils 11. In that case, two sets of heating coils 11 are provided (FIG. 5).
[0021]
When the first-stage heating 21 and the second-stage heating 23 are performed using different heating coils 11, the heating coil 11 (FIG. 7) used in the first-stage heating 21 and the heating used in the second-stage heating 23 are used. The shape of the coil 11 (FIG. 8) may be different, or the shape of the heating coil used in the first stage heating 21 and the shape of the heating coil used in the second stage heating 23 may be the same. In this case, the transfer (movement) of the heat treatment member 1 from the heating coil 11 (FIG. 7) of the first-stage heating 21 to the heating coil 11 of the second-stage heating 22 takes a heating pause time (radiation time). ) 22.
[0022]
When one heating coil 11 heats one heat treatment member 1, the first stage heating 21 and the second stage heating 23 may be performed using the same (single) heating coil 11. In that case, the heating coil 11 is one set.
When the heating coil 11 is one set, the first-stage heating timer, the cooling-off timer, the second-stage heating timer, and the first-stage heating output and the second-stage heating output are set on the hardware side, respectively. In terms of software, each of them is operated sequentially for a specified time. However, this method only applies if the soaking is obtained with the same heating coil.
[0023]
When one heating coil 11 heats two heat treatment members 1 (FIG. 6), the heat treatment member 1 is heated at the upstream portion 11 a of one heating coil 11, and the heat treatment member 1 is heated during the heating pause 22. From the upstream portion 11a to the downstream portion 11b of the heating coil 11, and the heat treatment member 1 is heated by the downstream portion 11b of the heating coil 11. In this case, the heating output of the first stage and the heating output of the second stage are, of course, the same. The heating time of the first stage and the heating time of the second stage are also the same. Further, on the hard surface and the soft surface, during the heating suspension time, the heating device is turned off at the same time as the heating power is turned off, and the heat treatment member 1 starts moving from the upstream portion 11a of the coil 11 to the downstream portion 11b of the coil 11, and the heat treatment is stopped. At the same time when the member 1 reaches the predetermined position of the downstream portion 11b of the coil 11, the clamp device 12 is operated to fix the heat treatment member 1 at the predetermined position of the downstream portion 11b of the coil 11, and the heating power is turned on to turn on the second stage. The heating 23 is started. By doing so, the next heat treatment member 1 can be heated at the upstream portion 11a of the heating coil 11 while the heat treatment member 1 is being heated at the downstream portion 11b of the heating coil 11, and the productivity can be doubled. That is, twice as many heat treatment members 1 can be processed in the same time.
[0024]
In the cooling step 30, especially when the partial heat treatment is partial quenching (however, the partial heat treatment may be applied to partial tempering), as shown in FIGS. The cooling liquid flow flowing out of the injection hole of the injection jacket 7 while immersing the entire heat-treated member 1 inductively heated to a predetermined temperature or more in the cooling liquid 6 in the cooling liquid tank 5 and keeping it stationary. 8 is injected into the specific portion 1a and cooled.
[0025]
When the heat-treated member 1 is conveyed onto a part of the rollers 10 of the roller conveyor 9 that conveys the member 1 located above the cooling liquid tank 5, the heat treatment member 1 and the part of the roller 10 and the spray jacket 7 are heat-treated. The whole of the member 1 is mechanically immersed in the cooling liquid 6 in the cooling liquid tank 5, and a large amount of the cooling liquid flows out of the injection jacket 7 from three directions (left and right and two directions and upward) to form the heat treatment member 1. It is sprayed onto the specific portion 1a and cooled by immersion and liquid flow. When the cooling is completed, the heat treatment member 1 is raised to a position before being lowered together with a part of the rollers 10 and the injection jacket 7, and then is carried out. All processes of cooling and loading / unloading are performed by automatic control.
Examples of the cooling liquid used for quenching include water, a water-soluble quenching liquid, and oil, and any of them may be used. It is desirable to use water in terms of cost and working environment.
[0026]
Cooling by immersion and liquid flow ensures a sufficient cooling rate and uniform cooling. By ensuring a sufficient cooling rate, required quality (hardening hardness, tempering hardness, etc.) can be obtained, and by making the cooling rate uniform, it is possible to prevent quenching cracks. Further, since the heat treatment member 1 is cooled while being stopped at a fixed position in the coolant 6 in the coolant tank 5, the injection jacket 7 and the injection jacket 7 are compared with a cooling method in which the heat treatment member 1 moves through the coolant tank during cooling. Since the interference of the heat treatment member 1 is eliminated and the distance between the injection hole of the injection jacket 7 and the heat treatment member 1 can be shortened, the flow of the jet flow is not weakened, The required quality can be obtained because it can be injected and a high cooling rate can be ensured. Also, since the heat treatment member 1 is cooled while being stopped, the length of the cooling liquid tank 5 in the transport direction of the heat treatment member 1 is reduced as compared with the cooling method in which the heat treatment member 1 moves the cooling liquid tank during cooling. In addition, equipment manufacturing costs and equipment running costs are reduced.
[0027]
The partial heat treatment of the present invention including the heating step 20P of the first stage heating 21, the heating pause 22, and the second stage heating 23 of the present invention may be applied to partial quenching (FIG. 3) or partial quenching. It may be applied to tempering (FIG. 2) or to both partial quenching and partial tempering (FIG. 4).
[0028]
The partial heat treatment method of the present invention in FIG. 2 (when the partial heating 20P of the present invention is applied to the partial heating of tempering) includes a partial quenching step 100 and a partial tempering step 200.
In the partial quenching step 100, only the specific portion 1a of the heat-treated member 1 is Ac ₃ Step 20C of induction heating to a temperature equal to or higher than the transformation point, and only the specific portion is Ac ₃ The cooling liquid flow flowing out from the injection hole of the injection jacket 7 while the entire heat-treated member 1 that has been induction-heated to a temperature equal to or higher than the transformation point is immersed in a fixed position in the cooling liquid 6 in the cooling liquid tank 5 and kept stationary. 8 has a cooling step 30 for injecting it into the specific portion 1a.
The partial tempering step 200 includes an induction heating step 20P for inductively heating only a specific portion 1a of the heat treatment member 1 to a temperature of about 200 to 300 ° C. in the air, and a cooling step (either forced cooling or natural cooling). 30. The induction heating step 20P of the partial tempering step includes a first stage heating 21, a heating pause (radiation time) 22 following the first stage heating 21, and a second stage heating 23 following the heating pause 22. Having.
[0029]
The partial heat treatment method of the present invention shown in FIG. 3 (when the partial heating 20P of the present invention is applied to partial heating of quenching) includes a partial quenching step 100 and a partial tempering step 200.
In the partial quenching step 100, only the specific portion 1a of the heat-treated member 1 is Ac ₃ Step 20P of induction heating to a temperature equal to or higher than the transformation point, and only the specific portion is Ac ₃ The cooling liquid flow flowing out from the injection hole of the injection jacket 7 while the entire heat-treated member 1 that has been induction-heated to a temperature equal to or higher than the transformation point is immersed in a fixed position in the cooling liquid 6 in the cooling liquid tank 5 and kept stationary. 8 has a cooling step 30 for injecting it into the specific portion 1a. The induction heating step 20P of the partial quenching step includes a first stage heating 21, a heating pause (radiation time) 22 following the first stage heating 21, and a second stage heating 23 following the heating pause 22. Have.
The partial tempering process 200 includes an induction heating process 20C for inductively heating only a specific portion 1a of the heat treatment member 1 to a temperature of about 200 to 300 ° C. in the air, and a cooling process (either forced cooling or natural cooling). 30.
[0030]
The partial heat treatment method of the present invention shown in FIG. 4 (when the partial heating 20P of the present invention is applied to both the partial heating for quenching and the partial heating for tempering) includes a partial quenching step 100 and a partial tempering step 200. .
In the partial quenching step 100, only the specific portion 1a of the heat-treated member 1 is Ac ₃ Step 20P of induction heating to a temperature equal to or higher than the transformation point, and only the specific portion is Ac ₃ The cooling liquid flow flowing out from the injection hole of the injection jacket 7 while the entire heat-treated member 1 that has been induction-heated to a temperature equal to or higher than the transformation point is immersed in a fixed position in the cooling liquid 6 in the cooling liquid tank 5 and kept stationary. 8 has a cooling step 30 for injecting it into the specific portion 1a. The induction heating step 20P of the partial quenching step includes a first stage heating 21, a heating pause (radiation time) 22 following the first stage heating 21, and a second stage heating 23 following the heating pause 22. Have.
The partial tempering step 200 includes an induction heating step 20P for inductively heating only a specific portion 1a of the heat treatment member 1 to a temperature of about 200 to 300 ° C. in the air, and a cooling step (either forced cooling or natural cooling). 30. The induction heating step 20P of the partial tempering step includes a first stage heating 21, a heating pause (radiation time) 22 following the first stage heating 21, and a second stage heating 23 following the heating pause 22. Having.
[0031]
Next, a partial heat treatment apparatus of the present invention that performs the above-described partial heat treatment method will be described with reference to FIGS.
The partial heat treatment apparatus of the present invention is a partial heat treatment apparatus that heat-treats only a specific portion 1a of a heat treatment member 1, and includes an induction heating device (including an induction heating coil 11) that induction heats only a specific portion 1a and a specific portion 1a. Includes cooling devices 5 to 10 for cooling the heated heat treatment member 1. The induction heating device includes one or more heating coils 11 that sequentially perform a first-stage heating 21, a heating pause 22, and a second-stage heating 23.
[0032]
The heating output of the first stage heating 21 can be set to be equal to or higher than the heating output of the second stage heating 23.
The partial heat treatment apparatus includes a clamp device 12 for fixing the heat treatment member 1 during heating of the specific portion 1a of the heat treatment member 1.
One heating coil 11 may heat one heat treatment member 1 (FIG. 5).
When one heating coil 11 heats one heat treatment member 1, the heating coil 11 performing the first-stage heating 21 and the heating coil 11 performing the second-stage heating 23 may be separate heating coils. Alternatively, the same (single) heating coil 11 may be used.
When the heating coil 11 performing the first-stage heating 21 and the heating coil 11 performing the second-stage heating 23 are separate heating coils, the heating coil 11 performing the first-stage heating 21 and the second-stage heating are performed. The heating coils 11 for performing 23 may have different shapes from each other or may have the same shape.
One heating coil 11 may heat two heat treatment members 1 (FIG. 6).
[0033]
The cooling device includes a roller conveyor 10 that immerses the conveyed heat treatment member 1 in a fixed position in the cooling liquid 6 in the cooling liquid tank 5 and stops the roller.
The cooling device is provided with an injection jacket 7 for injecting the outflowing coolant flow 8 to a specific portion 1 a of the heat treatment member 1.
The heat treatment member 1 is, for example, an endless track link. When the heat treatment member 1 is a link for an endless track belt, the specific portion 1a is a roller tread portion of the link.
The partial heat treatment may be partial quenching, partial tempering, or both partial quenching and partial tempering.
[0034]
【The invention's effect】
According to the partial heat treatment method of the first aspect and the partial heat treatment apparatus of the seventeenth aspect, in the heating step, induction heating is performed in two stages of heating, and heating is performed between the first stage heating and the second stage heating. Since the pause time is provided, the entire specific portion of the heat treatment member can be heated to a uniform temperature.
According to the partial heat treatment method of the second aspect and the partial heat treatment apparatus of the eighteenth aspect, since the heating in the second stage is the same as or lower than the heating in the first stage, the entire specific portion of the heat treatment member is heated. It can be heated to a uniform temperature.
According to the partial heat treatment method of the third aspect and the partial heat treatment apparatus of the nineteenth aspect, since the heat treatment member is fixed during the heating, the specific portion can be heated to a predetermined temperature at a predetermined depth and the quality of the heat treatment member is improved.
According to the partial heat treatment method of claims 4 to 7 and the partial heat treatment apparatus of claims 20 to 23, productivity can be improved.
According to the partial heat treatment method of claim 8 and the partial heat treatment apparatus of claim 24, the number of heating coils is reduced, and as a result, the manufacturing cost of the heating coils is reduced.
According to the partial heat treatment method of claim 9 and the partial heat treatment apparatus of claim 25, productivity can be doubled.
According to the partial heat treatment method of the tenth aspect and the partial heat treatment apparatus of the twenty-sixth aspect, in the cooling step, the entire heat treatment member is immersed at a fixed position in the cooling liquid in the cooling liquid tank and stopped, so that the specific part is Injection can be aimed, and the quality of heat treatment can be improved. In addition, the heat treatment apparatus becomes compact in the direction of transporting the work, and equipment-related costs can be reduced.
According to the partial heat treatment method of the eleventh aspect and the partial heat treatment apparatus of the twenty-seventh aspect, in particular, in the quenching cooling step, the cooling liquid flow flowing out of the injection jacket is injected to the specific portion, so that sufficient cooling capacity is secured. At the same time, the cooling becomes uniform.
According to the partial heat treatment method of claims 12 and 13, and the partial heat treatment apparatus of claims 28 and 29, mechanical quality can be improved by applying the present invention to the roller tread of the link for the endless track belt. .
According to the partial heat treatment method of claims 14 to 16 and the partial heat treatment apparatus of claims 30 to 32, the heat treatment may be partial quenching, partial tempering, or partial quenching and partial quenching. Both types may be used, and the degree of freedom of application is high.
[Brief description of the drawings]
FIG. 1 is a process chart of a partial heat treatment method for a heat treatment member of the present invention.
FIG. 2 is a process chart in a case where the method for partially heat-treating a heat-treated member of the present invention is applied to partial tempering.
FIG. 3 is a process chart in a case where the method for partially heat-treating a heat-treated member of the present invention is applied to partial quenching.
FIG. 4 is a process chart in a case where the method for partially heat-treating a heat-treated member of the present invention is applied to both partial quenching and partial tempering.
FIG. 5 is a layout view (side view) of a heating coil when one heating coil is used to heat one heat treatment member in the method and apparatus for partial heat treatment of a heat treatment member according to the present invention.
FIG. 6 is a layout view (side view) of a heating coil when two long heat treatment members are heated by one long heating coil in the method and the apparatus for partial heat treatment of a heat treatment member of the present invention.
FIG. 7 is a cross-sectional view of a heating coil of a first stage heating of a portion related to tempering in the method and apparatus for partial heat treatment of a heat-treated member of the present invention.
FIG. 8 is a cross-sectional view of a heating coil of a second stage heating of a portion related to tempering in the method and apparatus for partial heat treatment of a heat-treated member of the present invention.
FIG. 9 is a plan view (viewed from above) of a clamp device and a heating coil in the method and apparatus for partial heat treatment of a heat treatment member of the present invention.
FIG. 10 is a cross-sectional view of a part related to cooling (the figure shows the case of quenching cooling) of the method and the apparatus for partially heat-treating a heat-treated member of the present invention.
FIG. 11 is a cross-sectional view of the part of FIG. 10;
FIG. 12 is a perspective view of a part of an endless track belt of the construction machine.
13 is a front view of the link in FIG.
FIG. 14 is a side view of the link in FIG.
[Explanation of symbols]
1 Heat-treated components (for example, links for endless tracks of construction machinery)
1a Specific part (for example, roller tread of link for endless track link of construction equipment)
5 Coolant tank
6 Coolant
7 Injection jacket
8 Coolant flow
9 Roller conveyor
10 Some rollers
11 heating coil
12 Clamping device
20 Induction heating process
20P Induction heating process of the present invention with first stage heating, heating pause, second stage heating
20C General heating process
21 First Stage Heating
22 Heating pause
23 Second stage heating
30 Cooling process
100 Partial quenching process
200 Partial tempering process

Claims

熱処理部材の特定部分のみを熱処理する部分熱処理方法であって、
前記熱処理は、前記特定部分のみを誘導加熱する誘導加熱工程と、ついで行われる冷却工程とを含んでおり、
前記誘導加熱工程が、第１段階の加熱と、該第１段階の加熱に続く加熱休止と、該加熱休止に続く第２段階の加熱を含んでいる、
熱処理部材の部分熱処理方法。A partial heat treatment method in which only a specific portion of the heat treatment member is heat treated,
The heat treatment includes an induction heating step of induction heating only the specific portion, and a cooling step performed subsequently,
Wherein the induction heating step includes a first stage heating, a heating pause following the first stage heating, and a second stage heating following the heating pause.
Partial heat treatment method for heat treated members.

前記第１段階の加熱の加熱出力は前記第２段階の加熱の加熱出力と等しいかそれよりも高く設定されている請求項１記載の熱処理部材の部分熱処理方法。2. The method according to claim 1, wherein the heating output of the first stage heating is set to be equal to or higher than the heating output of the second stage heating.

前記熱処理部材の特定部分の加熱中、前記熱処理部材を固定する請求項１記載の熱処理部材の部分熱処理方法。The partial heat treatment method for a heat treatment member according to claim 1, wherein the heat treatment member is fixed during heating of a specific portion of the heat treatment member.

１つの加熱コイルが１つの熱処理部材を加熱する請求項１記載の熱処理部材の部分熱処理方法。2. The method according to claim 1, wherein one heating coil heats one heat treatment member.

前記第１段階の加熱と前記第２段階の加熱を別個の加熱コイルを用いて行う請求項４記載の熱処理部材の部分熱処理方法。The partial heat treatment method for a heat treated member according to claim 4, wherein the first stage heating and the second stage heating are performed using separate heating coils.

前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルが互いに異なる形状を有している請求項５記載の熱処理部材の部分熱処理方法。6. The partial heat treatment method for a heat treated member according to claim 5, wherein the heating coil for performing the first stage heating and the heating coil for performing the second stage heating have different shapes.

前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルは同一の形状を有している請求項５記載の熱処理部材の部分熱処理方法。The partial heat treatment method for a heat treatment member according to claim 5, wherein the heating coil for performing the first stage heating and the heating coil for performing the second stage heating have the same shape.

前記第１段階の加熱と前記第２段階の加熱を同じ加熱コイルを用いて行う請求項４記載の熱処理部材の部分熱処理方法。5. The method according to claim 4, wherein the first stage heating and the second stage heating are performed using the same heating coil.

１つの加熱コイルが熱処理部材を２つ加熱する請求項１記載の熱処理部材の部分熱処理方法。2. The method according to claim 1, wherein one heating coil heats two heat treatment members.

前記冷却工程では、前記熱処理部材の全体を冷却液槽内の冷却液中の定位置に浸漬して静止させる請求項１記載の熱処理部材の部分熱処理方法。The partial heat treatment method for a heat treatment member according to claim 1, wherein in the cooling step, the entirety of the heat treatment member is immersed in a fixed position in a coolant in a coolant tank and stopped.

前記冷却工程では、噴射ジャケットより流出する冷却液流を前記特定部分に噴射する請求項１記載の熱処理部材の部分熱処理方法。2. The partial heat treatment method for a heat treatment member according to claim 1, wherein, in the cooling step, a coolant flow flowing out from a spray jacket is sprayed to the specific portion.

前記熱処理部材が無限軌道帯用リンクである請求項１記載の熱処理部材の部分熱処理方法。2. The method according to claim 1, wherein the heat-treating member is a link for an endless track.

前記特定部分が前記リンクのローラー踏面部である請求項１２記載の熱処理部材の部分熱処理方法。The method according to claim 12, wherein the specific portion is a roller tread portion of the link.

前記熱処理が部分焼入れである請求項１記載の熱処理部材の部分熱処理方法。The method according to claim 1, wherein the heat treatment is partial quenching.

前記熱処理が部分焼もどしである請求項１記載の熱処理部材の部分熱処理方法。2. The method according to claim 1, wherein the heat treatment is partial tempering.

前記熱処理が部分焼入れと部分焼もどしである請求項１記載の熱処理部材の部分熱処理方法。The method according to claim 1, wherein the heat treatment is partial quenching and partial tempering.

熱処理部材の特定部分のみを熱処理する部分熱処理装置であって、
前記特定部分のみを誘導加熱する誘導加熱装置と、前記特定部分が加熱された熱処理部材を冷却する冷却装置とを含んでおり、
前記誘導加熱装置が、第１段階の加熱、加熱休止、第２段階の加熱を順に行う１つ以上の加熱コイルを有している、
熱処理部材の部分熱処理装置。A partial heat treatment apparatus that heat-treats only a specific portion of the heat treatment member,
Induction heating device for induction heating only the specific portion, and a cooling device for cooling the heat treatment member where the specific portion is heated,
The induction heating device has one or more heating coils that sequentially perform first-stage heating, heating pause, and second-stage heating,
Partial heat treatment equipment for heat treatment members.

前記第１段階の加熱の加熱出力を前記第２段階の加熱の加熱出力と等しいかそれ以上に設定可能である請求項１７記載の熱処理部材の部分熱処理装置。The partial heat treatment apparatus for a heat treatment member according to claim 17, wherein a heating output of the first-stage heating can be set to be equal to or more than a heating output of the second-stage heating.

前記熱処理部材の特定部分の加熱中、前記熱処理部材を固定するクランプ装置を備えている請求項１７記載の熱処理部材の部分熱処理装置。18. The partial heat treatment apparatus for a heat treatment member according to claim 17, further comprising a clamp device for fixing the heat treatment member during heating of a specific portion of the heat treatment member.

１つの加熱コイルが１つの熱処理部材を加熱する請求項１７記載の熱処理部材の部分熱処理装置。The partial heat treatment apparatus for a heat treatment member according to claim 17, wherein one heating coil heats one heat treatment member.

前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルが別個になっている請求項２０記載の熱処理部材の部分熱処理装置。21. The partial heat treatment apparatus for a heat treatment member according to claim 20, wherein a heating coil for performing the first stage heating and a heating coil for performing the second stage heating are separate.

前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルが互いに異なる形状を有している請求項２１記載の熱処理部材の部分熱処理装置。22. The partial heat treatment apparatus for a heat treatment member according to claim 21, wherein the heating coil for performing the first stage heating and the heating coil for performing the second stage heating have different shapes.

前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルが同一の形状を有している請求項２１記載の熱処理部材の部分熱処理装置。22. The partial heat treatment apparatus for a heat treatment member according to claim 21, wherein a heating coil for performing the first stage heating and a heating coil for performing the second stage heating have the same shape.

前記第１段階の加熱を行う加熱コイルと前記第２段階の加熱を行う加熱コイルが同一である請求項２０記載の熱処理部材の部分熱処理装置。21. The partial heat treatment apparatus for a heat treatment member according to claim 20, wherein a heating coil for performing the first stage heating and a heating coil for performing the second stage heating are the same.

１つの加熱コイルが熱処理部材を２つ加熱する請求項１７記載の熱処理部材の部分熱処理装置。The partial heat treatment apparatus for a heat treatment member according to claim 17, wherein one heating coil heats two heat treatment members.

前記冷却装置が、搬送される前記熱処理部材を冷却液槽内の冷却液中の定位置に浸漬して静止させるローラーコンベヤーを備えている請求項１７記載の熱処理部材の部分熱処理装置。18. The partial heat treatment apparatus for a heat treatment member according to claim 17, wherein the cooling device includes a roller conveyor that immerses the conveyed heat treatment member at a predetermined position in a cooling liquid in a cooling liquid tank and stops the roller.

前記冷却装置が、流出する冷却液流を前記特定部分に噴射する噴射ジャケットを備えている請求項１７記載の熱処理部材の部分熱処理装置。18. The partial heat treatment device for a heat treatment member according to claim 17, wherein the cooling device includes an injection jacket that injects the outflowing coolant flow to the specific portion.

前記熱処理部材が無限軌道帯用リンクである請求項１７記載の熱処理部材の部分熱処理装置。18. The partial heat treatment apparatus for a heat treatment member according to claim 17, wherein the heat treatment member is an endless track link.

前記特定部分が前記リンクのローラー踏面部である請求項２８記載の熱処理部材の部分熱処理装置。The partial heat treatment apparatus for a heat treatment member according to claim 28, wherein the specific portion is a roller tread portion of the link.

前記熱処理が部分焼入れである請求項１７記載の熱処理部材の部分熱処理装置。The partial heat treatment apparatus for a heat treated member according to claim 17, wherein the heat treatment is partial quenching.

前記熱処理が部分焼もどしである請求項１７記載の熱処理部材の部分熱処理装置。The partial heat treatment apparatus for a heat treated member according to claim 17, wherein the heat treatment is partial tempering.

前記熱処理が部分焼入れと部分焼もどしである請求項１７記載の熱処理部材の部分熱処理装置。18. The partial heat treatment apparatus for a heat treated member according to claim 17, wherein the heat treatment is partial quenching and partial tempering.