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JP4175955B2 - Heat treatment equipment for cylindrical workpiece - Google Patents

Heat treatment equipment for cylindrical workpiece Download PDF

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Publication number
JP4175955B2
JP4175955B2 JP2003160145A JP2003160145A JP4175955B2 JP 4175955 B2 JP4175955 B2 JP 4175955B2 JP 2003160145 A JP2003160145 A JP 2003160145A JP 2003160145 A JP2003160145 A JP 2003160145A JP 4175955 B2 JP4175955 B2 JP 4175955B2
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workpiece
heat treatment
rollers
treatment apparatus
cylindrical
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JP2004360013A (en
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幸 鎌田
誠 上田
功 吉田
洋一 正木
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Topy Industries Ltd
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Topy Industries 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Heat Treatment Of Articles (AREA)
  • General Induction Heating (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、円筒状ワークの熱処理装置であり、円筒状ワークを２本のローラ上に搬送する時に、円筒状ワークがローラに線接触し、かつ、複数つらなって搬送されるようにする、円筒状ワークの熱処理装置に関する。
【０００２】
【従来の技術】
円筒状ワークとして、建設機械用履帯部品であるブッシュがある。ブッシュはその外周部に高周波焼入れが施される。従来のブッシュの高周波焼入れにおいては、図４に示すように、ブッシュ１は、送り機構付き回転台からなる搬送装置２の上に立てられて回転されながら下降され、加熱部３で加熱コイルにて高周波誘導加熱され、ついで冷却部４で噴射ジャケットにより冷却液を噴射されて急冷される。
【０００３】
【特許文献１】
特開昭５９−７７９７９号公報
【特許文献２】
特開昭６３−１０９１１９号公報
【特許文献３】
特開平９−１４３５６４号公報
【０００４】
【発明が解決しようとする課題】
ブッシュ外周部の高周波焼入れにおいては、ワークが均一に加熱されることと、トータルサイクルタイムが短いことが、要求される。
均一加熱により、製品の表面硬度、断面硬度、硬化深さ、硬化パターンなどが確保され、短いトータルサイクルタイムにより、生産性が確保される。
しかし、従来の各ワーク毎の縦方向搬送を伴う熱処理には、つぎの問題がある。
ワークを回転させながら送るので、ワークを周方向に均一に加熱することはできるが、ワークを回転台に載せるので、熱がワークから回転台に逃げ、ワークのコイル部への入側端部には熱が入りにくく、ワークのコイル部からの出側端部には熱が入り過ぎて、ワークを軸方向に均一加熱することができない。
また、ワーク毎にワークを搬送装置に着脱するので、連続搬送ができず、ワークの搬送間にワーク着脱時間分の無駄時間が存在し、トータルサイクルタイムが長くなる。
【０００５】
本発明の目的は、ワークを軸方向に均一に加熱することができ、かつ、ワークを連続して搬送することができる、円筒状ワークの熱処理装置を提供することにある。
【０００６】
【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はつぎの通りである。
（１） ローラ軸芯まわりに回転される２本のローラを有し、該２本のローラ上に複数の円筒状ワークが搬送される円筒状ワークの熱処理装置であって、
前記２本のローラは、それぞれ、ローラ軸方向に凹状の円弧形状をなしており、
前記２本のローラの少なくとも１本が、ワーク入口側からワーク出口側に向かって水平位置から下方側に傾斜しており、かつ、前記２本のローラの水平からの傾斜角度が互いに異なっていて、その傾斜角度の差が０．５〜５度の範囲にあり、前記２本のローラは、ワーク出口側のローラ径がワーク入口側のローラ径より小さくなっている円筒状ワークの熱処理装置。
（２） 前記熱処理装置は、高周波焼入れ装置における円筒状ワークの熱処理装置である（１）記載の円筒状ワークの熱処理装置。
（３） 前記２本のローラは、高周波焼入れ装置の加熱コイル部とジャケット部のところに、小径部を有している（２）記載の円筒状ワークの熱処理装置。
（４） 前記円筒状ワークは、建設用機械の履帯のブッシュである（１）記載の円筒状ワークの熱処理装置。
【０００７】
上記（１）〜（３）の円筒状ワークの熱処理装置では、２本のローラは、それぞれ、ローラ軸方向に凹状の円弧形状をなしているので、ワークがローラに線接触するようになり、ワークからローラへの熱伝達がワークの軸方向に均一となり、ワークが軸方向に均一に加熱されるようになる。また、２本のローラの少なくとも１本が、ワーク入口側からワーク出口側に向かって水平位置から下方側に傾斜しており、かつ、２本のローラの水平からの傾斜角度が互いに異なっていて、その傾斜角度の差が０．５〜５度の範囲にあるので、ワークを回転させながら一定速度で軸方向に搬送することができる。これによってワークの周方向の均一加熱が維持される。
さらに、ワーク出口側のローラ径がワーク入口側のローラ径より小さいので、ワークが進むにつれて周速が低下し、複数のワークがつらなって搬送される時に、ワーク同士が離れることがない。したがって、ワーク同士が離れた時の、ワークの前端部の加熱不足、後端部の過熱を防止することができる。
上記（４）の円筒状ワークの熱処理装置では、該熱処理装置が履帯のブッシュの焼入れに適用されることにより、ブッシュの品質の向上と、熱処理工程の生産性の向上をはかることができる。
【０００８】
【発明の実施の形態】
以下に、本発明の円筒状ワークの熱処理装置を、図１〜図３を参照して説明する。
本発明の円筒状ワークの熱処理装置１０は、図１〜図２に示すように、横方向に延び、ローラ軸芯まわりに回転される２本のローラ１１、１２を有し、該２本のローラ１１、１２上に円筒状ワーク１３が搬送される、横型搬送の熱処理装置（図４は縦型搬送の熱処理装置）からなる。円筒状ワーク１３は、複数、ワーク軸方向につらなって搬送されてもよい。２本のローラ１１、１２の回転速度は制御可能である。
【０００９】
図３に示すように、各ローラ１１、１２のローラ軸方向の形状（ローラの側面視における、ローラ外形形状）は、それぞれ、（ローラ長手方向中央部がローラ長手方向両端部を結ぶ直線より軸心側にあるように湾曲した）凹状の円弧形状となっている。また、各ローラ１１、１２の、ワーク出口側端部の径はワーク入口側端部の径より小である。円弧の半径Ｒは、１００００〜２０００００ｍｍ程度である。図３は、ローラ１１、１２の外形の形状を誇張して示してある。ローラ１１、１２の側面が軸方向に円弧形状であるため、ローラ１１、１２はワーク１３に線接触する。ローラ１１、１２の側面がローラ軸方向に直線形状であると、ローラ１１、１２の傾斜角度に差があるため、ローラ１１、１２はワーク１３に軸方向で点接触になってしまうが、円弧形状とすることによりローラ１１、１２はワーク１３に線接触するようになる。
【００１０】
２本のローラ１１、１２の少なくとも１本が、ワーク入口側からワーク出口側に向かって水平位置から下方側に傾斜しており、かつ、２本のローラ１１、１２の水平からの傾斜角度が互いに異なっていて、その傾斜角度の差が０．５〜５度の範囲にある。傾斜角度の大きい方のローラがワークを送る「送りローラ」として働き、傾斜角度の小さい方のローラがワークを回転させる「回転ローラ」として働く。傾斜角度に差がある２本のローラ１１、１２上にワーク１３を搬送するようにしたので、ワーク１３をワーク軸芯まわりに回転させながらローラ軸方向に、ローラが下がっている方向に、ワーク１３を送ることができる。
【００１１】
２本のローラ１１、１２は、ワーク出口側のローラ径がワーク入口側のローラ径より小さい。ローラ径が小さい方が周速が低下し、ワーク送り速度も低下する。ワーク出口側の方がワーク入口側よりワーク送り速度が低下するため、連続してワーク１３を搬送する時に、ワーク１３同士が離れず、隣り合うワーク１３の端部が接触したまま、ワーク１３をつらならせて搬送することができる。
【００１２】
図１は、熱処理装置１０が、高周波焼入れ装置における円筒状ワークの熱処理装置に適用された場合を示す。
その場合、２本のローラ１１、１２は、高周波焼入れ装置の加熱コイル１４と冷却液噴射ジャケット１５のところに、小径部１６、１７を有している。ローラ１１の外周部分は、小径部１６によって、部分１１ａ、１１ｂ、１１ｃに分けられる。ローラ１２の外周部分は、小径部１７によって、部分１２ａ、１２ｂ、１２ｃに分けられる。小径部１６、１７の径は、ローラ１１、１２の径の５０〜９０％程度である。ローラ１１、１２が小径部１６、１７を有するため、加熱コイル１４と冷却液噴射ジャケット１５とを、ローラ１１、１２に干渉することなく、設けることができる。前述のローラ１１、１２の傾斜角度、円弧形状、ワーク出口側のローラ径がワーク入口側のローラ径より小さいこと等の仕様は、小径部１６、１７の有無によらず、同一である。
【００１３】
加熱コイル部１４は、円形の加熱コイルの軸芯を横にして配置し、その中をワーク１３を通過させる。
ジャケット部１５は、円形（円形以外でもよく、たとえば四角形でもよい）などのジャッケット部から内側に向かって冷却液を噴射するようにし、その中をワーク１３を通過させる。ワーク搬送方向に、ジャケット部１５は加熱コイル部１４より下流側にあり、加熱コイル部１４で外周部が加熱されたワーク１３をジャケット部１５から噴射される冷却液で急冷して、ワーク１３の外周部に焼入れを施す。
【００１４】
円筒状ワーク１３は、たとえば、建設機械の履帯のブッシュである。ブッシュに所定の表面硬さを付与するために、外周部に焼入れが施されるが、その焼入れ装置の熱処理搬送装置として、本発明の円筒状ワークの熱処理装置１０を用いることができる。
ただし、円筒状ワーク１３はブッシュに限るものではなく、建設機械の履帯のピン（中実の円筒状棒）であってもよいし、それ以外の円筒状ワークであってもよい。
【００１５】
つぎに、本発明の円筒状ワークの熱処理装置の作用を説明する。
２本のローラ１１、１２が、それぞれ、ローラ軸方向に凹状の円弧形状となっているので、ワーク１３とローラ１１、１２とが線接触し、ワーク１３からローラ１１、１２への熱伝達がワークの軸方向に均一となり、ワーク１３が加熱部１４によって加熱される時に、ワーク軸方向に均一に加熱されるようになる。
また、２本のローラ１１、１２の少なくとも１本が、ワーク入口側からワーク出口側に向かって水平位置から下方側に傾斜しており、かつ、２本のローラ１１、１２の水平からの傾斜角度が互いに異なっていて、その傾斜角度の差が０．５〜５度の範囲にあるので、ワーク１３を回転させながら一定速度で軸方向に搬送することができる。これによって、ワーク１３は周方向にも均一に加熱される。さらに、ワーク出口側のローラ径がワーク入口側のローラ径より小さいので、ワーク１３搬送方向にローラ１１、１２の周速、したがってワーク搬送速度が低下し、複数のワーク１３を連ねて搬送する時に、ワーク１３同士が離れることがない。したがって、ワーク１３同士が離れた時の、加熱部１４による、ワークの前端部の加熱不足、後端部の過熱を防止することができる。
また、本発明の熱処理装置１０が建設機械の履帯のブッシュの焼入れに適用された場合は、軸方向の均一加熱によるブッシュの品質の向上と、連続搬送による熱処理工程の生産性の向上をはかることができる。
【００１６】
【発明の効果】
請求項１〜３の円筒状ワークの熱処理装置によれば、２本のローラが、それぞれ、ローラ軸方向に凹状の円弧形状をなしているので、ワークがローラに線接触するようになり、ワークからローラへの熱伝達がワークの軸方向に均一となり、ワークが軸方向に均一に加熱されるようになる。また、２本のローラの少なくとも１本が、ワーク入口側からワーク出口側に向かって水平位置から下方側に傾斜しており、かつ、２本のローラの水平からの傾斜角度が互いに異なっていて、その傾斜角度の差が０．５〜５度の範囲にあるので、ワークを回転させながら一定速度で軸方向に搬送することができる。これによってワークの周方向の均一加熱が維持される。
さらに、ワーク出口側のローラ径がワーク入口側のローラ径より小さいので、ワークが進むにつれて周速が低下し、複数のワークがつらなって搬送される時に、ワーク同士が離れることがない。したがって、ワークを軸方向に均一加熱することが容易になる。
請求項４の円筒状ワークの熱処理装置によれば、該熱処理装置が履帯のブッシュの焼入れに適用されることにより、ブッシュの品質の向上と、熱処理工程の生産性の向上をはかることができる。
【図面の簡単な説明】
【図１】本発明の円筒状ワークの熱処理装置の側面図である。
【図２】本発明の円筒状ワークの熱処理装置の正面図である。
【図３】本発明の円筒状ワークの熱処理装置のローラの側面図である（ただし、ローラの外形形状を誇張して示してある）。
【図４】従来の円筒状ワークの熱処理装置を用いた焼入れ装置の斜視図である。
【符号の説明】
１０ 円筒状ワークの熱処理装置
１１、１２ ローラ
１３ 円筒状ワーク（たとえば、履帯のブッシュ）
１４ 加熱コイル
１５ 冷却液噴射ジャケット
１６、１７ 小径部[0001]
BACKGROUND OF THE INVENTION
The present invention is a heat treatment apparatus for a cylindrical workpiece, and when the cylindrical workpiece is conveyed onto two rollers, the cylindrical workpiece is in line contact with the roller and is conveyed in a plurality of groups. The present invention relates to a heat treatment apparatus for a cylindrical workpiece.
[0002]
[Prior art]
As a cylindrical work, there is a bush which is a crawler part for construction machinery. The bush is induction-hardened on its outer periphery. In conventional induction hardening of a bush, as shown in FIG. 4, the bush 1 is placed on a conveying device 2 composed of a turntable with a feed mechanism and lowered while being rotated. High-frequency induction heating is performed, and then the cooling liquid is jetted by the jet jacket in the cooling unit 4 to be rapidly cooled.
[0003]
[Patent Document 1]
JP 59-7779 A [Patent Document 2]
Japanese Patent Laid-Open No. 63-109119 [Patent Document 3]
Japanese Patent Laid-Open No. 9-143564
[Problems to be solved by the invention]
In induction hardening of the outer periphery of the bush, it is required that the workpiece is heated uniformly and that the total cycle time is short.
Uniform heating ensures the product surface hardness, cross-sectional hardness, cure depth, cure pattern, and the like, and a short total cycle time ensures productivity.
However, the conventional heat treatment that involves vertical conveyance for each workpiece has the following problems.
Since the work is sent while rotating, the work can be heated uniformly in the circumferential direction, but since the work is placed on the turntable, the heat escapes from the work to the turntable and enters the coil end of the work Is difficult for heat to enter, and heat is excessively applied to the exit end portion from the coil portion of the work, and the work cannot be uniformly heated in the axial direction.
In addition, since the workpiece is attached to and detached from the transfer device for each workpiece, continuous transfer is not possible, and there is a dead time corresponding to the workpiece attachment / detachment time between workpiece transfers, resulting in a long total cycle time.
[0005]
The objective of this invention is providing the heat processing apparatus of the cylindrical workpiece | work which can heat a workpiece | work uniformly to an axial direction, and can convey a workpiece | work continuously.
[0006]
[Means for Solving the Problems]
The present invention for achieving the above object is as follows.
(1) A heat treatment apparatus for a cylindrical workpiece having two rollers rotated around a roller shaft core, and a plurality of cylindrical workpieces conveyed on the two rollers,
Each of the two rollers has a concave arc shape in the roller axial direction,
At least one of the two rollers is inclined downward from the horizontal position from the workpiece entrance side to the workpiece exit side, and the inclination angles of the two rollers from the horizontal are different from each other. The cylindrical workpiece heat treatment apparatus in which the difference in inclination angle is in the range of 0.5 to 5 degrees, and the two rollers have a roller diameter on the workpiece outlet side smaller than the roller diameter on the workpiece inlet side.
(2) The heat treatment apparatus for a cylindrical workpiece according to (1), wherein the heat treatment apparatus is a heat treatment apparatus for a cylindrical workpiece in an induction hardening apparatus.
(3) The heat treatment apparatus for a cylindrical workpiece according to (2), wherein the two rollers have a small diameter portion at a heating coil portion and a jacket portion of an induction hardening device.
(4) The cylindrical workpiece heat treatment apparatus according to (1), wherein the cylindrical workpiece is a bush of a crawler belt of a construction machine.
[0007]
In the heat treatment apparatus for cylindrical workpieces of (1) to (3) above, the two rollers each have a concave arc shape in the roller axial direction, so that the workpiece comes into line contact with the rollers, Heat transfer from the workpiece to the roller becomes uniform in the axial direction of the workpiece, and the workpiece is heated uniformly in the axial direction. In addition, at least one of the two rollers is inclined downward from the horizontal position from the workpiece entrance side to the workpiece exit side, and the inclination angles of the two rollers from the horizontal are different from each other. Since the difference in inclination angle is in the range of 0.5 to 5 degrees, the workpiece can be conveyed in the axial direction at a constant speed while rotating. Thereby, uniform heating in the circumferential direction of the workpiece is maintained.
Furthermore, since the roller diameter on the workpiece outlet side is smaller than the roller diameter on the workpiece inlet side, the peripheral speed decreases as the workpiece advances, and the workpieces are not separated from each other when a plurality of workpieces are conveyed. Therefore, when the workpieces are separated from each other, insufficient heating of the front end portion of the workpiece and overheating of the rear end portion can be prevented.
In the heat treatment apparatus for cylindrical workpieces of (4) above, the heat treatment apparatus is applied to quenching the bushing of the crawler belt, so that the quality of the bush and the productivity of the heat treatment process can be improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Below, the heat processing apparatus of the cylindrical workpiece | work of this invention is demonstrated with reference to FIGS.
The cylindrical workpiece heat treatment apparatus 10 of the present invention includes two rollers 11 and 12 that extend in the lateral direction and rotate around a roller axis, as shown in FIGS. The cylindrical workpiece 13 is conveyed on the rollers 11 and 12 and is composed of a horizontal conveyance heat treatment apparatus (FIG. 4 shows a vertical conveyance heat treatment apparatus). A plurality of cylindrical workpieces 13 may be conveyed in the workpiece axis direction. The rotational speeds of the two rollers 11 and 12 can be controlled.
[0009]
As shown in FIG. 3, the shape of each of the rollers 11 and 12 in the roller axial direction (the outer shape of the roller in the side view of the roller) is an axis from a straight line connecting the roller longitudinal center and both ends of the roller longitudinal direction. It has a concave arc shape (curved to be on the center side). Moreover, the diameter of the workpiece | work exit side edge part of each roller 11 and 12 is smaller than the diameter of the workpiece | work entrance side edge part. The radius R of the arc is about 10,000 to 200,000 mm. FIG. 3 exaggerates the outer shape of the rollers 11 and 12. Since the side surfaces of the rollers 11 and 12 have an arc shape in the axial direction, the rollers 11 and 12 are in line contact with the workpiece 13. If the side surfaces of the rollers 11 and 12 are linear in the roller axial direction, the rollers 11 and 12 are in point contact with the workpiece 13 in the axial direction because there is a difference in the inclination angle of the rollers 11 and 12. By adopting the shape, the rollers 11 and 12 come into line contact with the workpiece 13.
[0010]
At least one of the two rollers 11 and 12 is inclined downward from the horizontal position from the workpiece entrance side to the workpiece exit side, and the inclination angle of the two rollers 11 and 12 from the horizontal is They are different from each other, and the difference in inclination angle is in the range of 0.5 to 5 degrees. The roller with the larger inclination angle serves as a “feed roller” for feeding the workpiece, and the roller with a smaller inclination angle serves as a “rotating roller” for rotating the workpiece. Since the workpiece 13 is transported onto the two rollers 11 and 12 having a difference in inclination angle, the workpiece 13 is rotated in the roller axis direction while the workpiece 13 is rotated around the workpiece axis, and the roller is lowered. 13 can be sent.
[0011]
The two rollers 11 and 12 have a roller diameter on the workpiece outlet side smaller than the roller diameter on the workpiece inlet side. The smaller the roller diameter, the lower the peripheral speed and the work feed speed. Since the workpiece feed speed is lower on the workpiece outlet side than the workpiece inlet side, when the workpiece 13 is continuously conveyed, the workpieces 13 are not separated from each other, and the workpieces 13 are kept in contact with each other. It can be transported in a twisted manner.
[0012]
FIG. 1 shows a case where the heat treatment apparatus 10 is applied to a heat treatment apparatus for a cylindrical workpiece in an induction hardening apparatus.
In this case, the two rollers 11 and 12 have small diameter portions 16 and 17 at the heating coil 14 and the coolant injection jacket 15 of the induction hardening apparatus. The outer peripheral portion of the roller 11 is divided into portions 11 a, 11 b, and 11 c by the small diameter portion 16. The outer peripheral portion of the roller 12 is divided into portions 12 a, 12 b, and 12 c by the small diameter portion 17. The diameter of the small diameter portions 16 and 17 is about 50 to 90% of the diameter of the rollers 11 and 12. Since the rollers 11 and 12 have the small diameter portions 16 and 17, the heating coil 14 and the coolant injection jacket 15 can be provided without interfering with the rollers 11 and 12. The specifications such as the inclination angle of the rollers 11 and 12, the arc shape, and the roller diameter on the workpiece outlet side are smaller than the roller diameter on the workpiece inlet side are the same regardless of the presence or absence of the small diameter portions 16 and 17.
[0013]
The heating coil unit 14 is arranged with the axis of the circular heating coil lying sideways, and allows the work 13 to pass therethrough.
The jacket portion 15 injects the cooling liquid inward from a jacket portion such as a circle (may be other than a circle or may be a rectangle), and allows the workpiece 13 to pass therethrough. The jacket portion 15 is located downstream of the heating coil portion 14 in the workpiece conveyance direction, and the workpiece 13 whose outer peripheral portion is heated by the heating coil portion 14 is rapidly cooled with the coolant sprayed from the jacket portion 15, Quench the outer periphery.
[0014]
The cylindrical workpiece 13 is, for example, a crawler bush of a construction machine. In order to give the bush a predetermined surface hardness, the outer peripheral portion is quenched, and the cylindrical workpiece heat treatment apparatus 10 of the present invention can be used as a heat treatment conveying apparatus of the quenching apparatus.
However, the cylindrical workpiece 13 is not limited to the bush, and may be a pin (solid cylindrical rod) of a crawler belt of a construction machine or other cylindrical workpiece.
[0015]
Next, the operation of the cylindrical workpiece heat treatment apparatus of the present invention will be described.
Since the two rollers 11 and 12 each have a concave arc shape in the roller axial direction, the workpiece 13 and the rollers 11 and 12 are in line contact, and heat transfer from the workpiece 13 to the rollers 11 and 12 is performed. It becomes uniform in the axial direction of the workpiece, and when the workpiece 13 is heated by the heating unit 14, it is heated uniformly in the workpiece axial direction.
Further, at least one of the two rollers 11 and 12 is inclined downward from the horizontal position from the workpiece inlet side toward the workpiece outlet side, and the two rollers 11 and 12 are inclined from the horizontal. Since the angles are different from each other and the difference in inclination angle is in the range of 0.5 to 5 degrees, the workpiece 13 can be conveyed in the axial direction at a constant speed while rotating. As a result, the workpiece 13 is uniformly heated in the circumferential direction. Furthermore, since the roller diameter on the workpiece outlet side is smaller than the roller diameter on the workpiece inlet side, the peripheral speed of the rollers 11 and 12 in the workpiece 13 conveyance direction, and hence the workpiece conveyance speed, decreases, and when a plurality of workpieces 13 are conveyed in series. The workpieces 13 are not separated from each other. Therefore, when the workpieces 13 are separated from each other, the heating unit 14 can prevent insufficient heating of the front end portion of the workpiece and overheating of the rear end portion.
In addition, when the heat treatment apparatus 10 of the present invention is applied to quenching the bush of the crawler belt of construction machinery, the bush quality should be improved by uniform heating in the axial direction and the productivity of the heat treatment process by continuous conveyance should be improved. Can do.
[0016]
【The invention's effect】
According to the cylindrical workpiece heat treatment apparatus of claims 1 to 3, since the two rollers each have a concave arc shape in the roller axial direction, the workpiece comes into line contact with the roller. The heat transfer from the roller to the roller becomes uniform in the axial direction of the workpiece, and the workpiece is heated uniformly in the axial direction. In addition, at least one of the two rollers is inclined downward from the horizontal position from the workpiece entrance side to the workpiece exit side, and the inclination angles of the two rollers from the horizontal are different from each other. Since the difference in inclination angle is in the range of 0.5 to 5 degrees, the workpiece can be conveyed in the axial direction at a constant speed while rotating. Thereby, uniform heating in the circumferential direction of the workpiece is maintained.
Furthermore, since the roller diameter on the workpiece outlet side is smaller than the roller diameter on the workpiece inlet side, the peripheral speed decreases as the workpiece advances, and the workpieces are not separated from each other when a plurality of workpieces are conveyed. Therefore, it becomes easy to uniformly heat the workpiece in the axial direction.
According to the heat treatment apparatus for a cylindrical workpiece according to the fourth aspect, the heat treatment apparatus is applied to quenching the bush of the crawler belt, so that the quality of the bush and the productivity of the heat treatment process can be improved.
[Brief description of the drawings]
FIG. 1 is a side view of a cylindrical workpiece heat treatment apparatus of the present invention.
FIG. 2 is a front view of a cylindrical workpiece heat treatment apparatus according to the present invention.
FIG. 3 is a side view of a roller of the cylindrical workpiece heat treatment apparatus of the present invention (however, the outer shape of the roller is exaggerated).
FIG. 4 is a perspective view of a quenching apparatus using a conventional cylindrical workpiece heat treatment apparatus.
[Explanation of symbols]
10 Cylindrical Work Heat Treatment Device 11, 12 Roller 13 Cylindrical Work (for example, Crawler Bush)
14 Heating coil 15 Coolant jet jacket 16, 17 Small diameter part

Claims (4)

ローラ軸芯まわりに回転される２本のローラを有し、該２本のローラ上に複数の円筒状ワークが搬送される円筒状ワークの熱処理装置であって、
前記２本のローラは、それぞれ、ローラ軸方向に凹状の円弧形状をなしており、
前記２本のローラの少なくとも１本が、ワーク入口側からワーク出口側に向かって水平位置から下方側に傾斜しており、かつ、前記２本のローラの水平からの傾斜角度が互いに異なっていて、その傾斜角度の差が０．５〜５度の範囲にあり、前記２本のローラは、ワーク出口側のローラ径がワーク入口側のローラ径より小さくなっている円筒状ワークの熱処理装置。A heat treatment apparatus for a cylindrical workpiece having two rollers rotated around a roller shaft core, on which a plurality of cylindrical workpieces are conveyed.
Each of the two rollers has a concave arc shape in the roller axial direction,
At least one of the two rollers is inclined downward from the horizontal position from the workpiece entrance side to the workpiece exit side, and the inclination angles of the two rollers from the horizontal are different from each other. The cylindrical workpiece heat treatment apparatus in which the difference in inclination angle is in the range of 0.5 to 5 degrees, and the two rollers have a roller diameter on the workpiece outlet side smaller than the roller diameter on the workpiece inlet side. 前記熱処理装置は、高周波焼入れ装置における円筒状ワークの熱処理装置である請求項１記載の円筒状ワークの熱処理装置。2. The heat treatment apparatus for a cylindrical work according to claim 1, wherein the heat treatment apparatus is a heat treatment apparatus for a cylindrical work in an induction hardening apparatus. 前記２本のローラは、高周波焼入れ装置の加熱コイル部とジャケット部のところに、小径部を有している請求項２記載の円筒状ワークの熱処理装置。The cylindrical work heat treatment apparatus according to claim 2, wherein the two rollers have a small diameter portion at a heating coil portion and a jacket portion of an induction hardening device. 前記円筒状ワークは、建設用機械の履帯のブッシュである請求項１記載の円筒状ワークの熱処理装置。2. The cylindrical workpiece heat treatment apparatus according to claim 1, wherein the cylindrical workpiece is a bush of a crawler belt of a construction machine.
JP2003160145A 2003-06-05 2003-06-05 Heat treatment equipment for cylindrical workpiece Expired - Lifetime JP4175955B2 (en)

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CN102560034A (en) * 2010-12-30 2012-07-11 大连冶金轴承股份有限公司 Roller quenching machine
CN103417396B (en) * 2013-08-13 2015-10-28 上海方木精细化工有限公司 Calcite-type toothpaste
CN104357636B (en) * 2014-10-09 2016-09-21 常熟中德重机有限公司 The quenching rifle torch that drum rope groove table is quenched special
CN108251620A (en) * 2018-02-02 2018-07-06 株洲市湘宁高中频设备有限责任公司 A kind of pivot pin outer ring quenching machine
CN110808670B (en) * 2018-08-06 2021-11-16 宝山钢铁股份有限公司 Induction heating system and method for rapidly curing silicon steel self-bonding coating iron core
JP7428113B2 (en) * 2020-10-27 2024-02-06 トヨタ自動車株式会社 Steel product manufacturing method and steel product manufacturing equipment
CN112853074B (en) * 2021-01-07 2023-05-05 黄冈市华窑中晖窑炉有限公司 Tunnel furnace for heat treatment of barrel
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