JP5098734B2 - Heat treatment method and heat treatment furnace for wire coil - Google Patents

Heat treatment method and heat treatment furnace for wire coil Download PDF

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JP5098734B2
JP5098734B2 JP2008076355A JP2008076355A JP5098734B2 JP 5098734 B2 JP5098734 B2 JP 5098734B2 JP 2008076355 A JP2008076355 A JP 2008076355A JP 2008076355 A JP2008076355 A JP 2008076355A JP 5098734 B2 JP5098734 B2 JP 5098734B2
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wire coil
heat treatment
pedestal
coil
furnace
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JP2009228074A (en
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善道 日野
岩本　　隆
康正 平井
秀途 木村
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JFE Steel Corp
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Description

本発明は、炭素鋼、特に軸受鋼などの高炭素鋼からなる線材コイルに球状化焼鈍などの熱処理を施す方法と該方法に用いられる熱処理炉に関する。   The present invention relates to a method for performing heat treatment such as spheroidizing annealing on a wire rod coil made of carbon steel, particularly high carbon steel such as bearing steel, and a heat treatment furnace used in the method.

従来、軸受鋼などの高炭素鋼からなる線材コイルに球状化焼鈍を施す場合、例えば、図４に示すような熱処理炉１００を用いて線材コイルＣＬに球状化焼鈍を施すことがある。しかしながら、図４に示すような熱処理炉を用いて線材コイルに球状化焼鈍を施すと、線材コイル全体が所定の焼鈍温度（例えば７８０℃）に達するまでに十数時間を要するため、その間に多量のエネルギを消費するという問題があった。なお、図４中の符号６ａ，６ｂ，６ｃ，６ｄは熱源となるラジアントチューブである。   Conventionally, when spheroidizing annealing is performed on a wire coil made of high carbon steel such as bearing steel, for example, the spheroidizing annealing may be performed on the wire coil CL using a heat treatment furnace 100 as shown in FIG. However, when spheroidizing annealing is performed on a wire coil using a heat treatment furnace as shown in FIG. 4, it takes a dozen hours for the entire wire coil to reach a predetermined annealing temperature (for example, 780 ° C.). There was a problem of consuming energy. In addition, the code | symbol 6a, 6b, 6c, 6d in FIG. 4 is a radiant tube used as a heat source.

このような問題を解決するため、Ｃ：０．８〜１．０重量％、Ｃｒ：０．９〜１．８重量％を少なくとも含有する軸受鋼を、抽出から仕上げ圧延に至る間、全断面内において温度がＡ１点〜Ａｃ点の間にあるように制御して圧延することにより球状化組織を得るようにした軸受鋼の製造方法が知られている（特許文献１参照）。
特開平１１−２８６７２４号公報 In order to solve such problems, a bearing steel containing at least C: 0.8 to 1.0% by weight and Cr: 0.9 to 1.8% by weight is subjected to the entire cross section during extraction to finish rolling. There is known a manufacturing method of bearing steel in which a spheroidized structure is obtained by controlling and rolling so that the temperature is between A1 and Ac points (see Patent Document 1).
JP-A-11-286724

特許文献１に開示された方法によれば、仕上げ圧延後の球状化焼鈍工程を省略または短縮することが可能であるが、次のような問題点があった。すなわち、特許文献１に開示された方法では、圧延が低温になるため、圧延能力の高い圧延機を必要とし、これを既設の圧延機で実現しようとすると、圧延設備を改造して圧延機の能力を上げることで対処せざるを得ないため、圧延設備の改造に多大の費用を要するという問題点があった。
本発明は上述した事情に鑑みてなされたものであり、その目的は、多量のエネルギを消費することなく炭素鋼からなる線材コイルに短時間で熱処理を施すことのできる線材コイルの熱処理方法と該方法に用いられる熱処理炉を提供することである。 According to the method disclosed in Patent Document 1, it is possible to omit or shorten the spheroidizing annealing step after finish rolling, but there are the following problems. That is, in the method disclosed in Patent Document 1, since rolling is performed at a low temperature, a rolling mill having a high rolling capacity is required, and if this is to be realized with an existing rolling mill, the rolling equipment is modified by changing the rolling equipment. There is a problem that it requires a lot of cost to remodel the rolling equipment because it must be dealt with by increasing the capacity.
The present invention has been made in view of the circumstances described above, and an object of the present invention is to provide a wire coil heat treatment method capable of performing heat treatment in a short time on a wire coil made of carbon steel without consuming a large amount of energy. It is to provide a heat treatment furnace used in the method.

上記課題を解決するために、請求項１に係る発明の線材コイルの熱処理方法は、炭素鋼からなる線材コイルを熱処理炉の台座上に鉛直に載置して熱処理を施すに際して、前記台座上に載置された線材コイルを前記台座の周囲に配置された複数の線材コイル分割部材により複数のコイル部に分割した状態で前記線材コイルに熱処理を施すことを特徴とするものである。
請求項２に係る発明の熱処理炉は、炭素鋼からなる線材コイルに熱処理を施すときに用いられ、炉本体と、該炉本体内に設けられた台座とを備えた熱処理炉において、前記台座上に鉛直に載置された線材コイルを複数のコイル部に分割する複数の線材コイル分割機構を前記台座の周囲に配置したことを特徴とするものである。 In order to solve the above-described problem, the wire coil heat treatment method according to the first aspect of the present invention provides a wire coil made of carbon steel that is vertically placed on a pedestal of a heat treatment furnace to perform heat treatment. A heat treatment is performed on the wire coil in a state where the placed wire coil is divided into a plurality of coil portions by a plurality of wire coil dividing members disposed around the pedestal.
A heat treatment furnace according to a second aspect of the invention is used when heat treating a wire coil made of carbon steel, and includes a furnace body and a pedestal provided in the furnace body. A plurality of wire coil dividing mechanisms that divide the wire coil placed vertically into a plurality of coil portions are arranged around the pedestal.

請求項１及び２に係る発明によれば、線材コイルを複数のコイル部に分割しないで熱処理を施した場合と比べて、炉本体内の高温ガスと接触する線材コイルの表面面積が増大し、炉内熱が線材コイルに入熱しやすくなる。これにより、球状化焼鈍などの熱処理を施す際に線材コイル全体が所定の熱処理温度に達するまでに長時間を要することがないので、多量のエネルギを消費することなく線材コイルに熱処理を施すことができる。   According to the invention according to claims 1 and 2, the surface area of the wire coil in contact with the high temperature gas in the furnace body is increased as compared with the case where the heat treatment is performed without dividing the wire coil into a plurality of coil portions. Heat in the furnace easily enters the wire coil. Accordingly, when the heat treatment such as spheroidizing annealing is performed, it does not take a long time for the entire wire coil to reach the predetermined heat treatment temperature, so that the wire coil can be heat treated without consuming a large amount of energy. it can.

以下、図面を参照して本発明の実施の形態を図面に基づいて説明する。
図１及び図２は本発明の第１実施形態に係る熱処理炉を示す図であり、本発明の第１実施形態に係る熱処理炉１は、炉本体２、台座３、台座駆動機構４および線材コイル分割機構５ａ，５ｂを備えて構成されている。
炉本体２は直方体形状に形成されており、この炉本体２の炉床部２１上の所定位置には、加熱源であるラジアントチューブ６ａ，６ｂ，６ｃ，６ｄが設置されている。また、炉本体２は線材コイルＣＬを炉本体２内に搬入出するための開口２２を有している。この開口２２は炉本体２の前壁部２３に形成されており、炉本体２の前壁部２３には、開口２２を開閉するための開閉扉７が上下方向にスライド可能に設けられている。 Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 are views showing a heat treatment furnace according to the first embodiment of the present invention. The heat treatment furnace 1 according to the first embodiment of the present invention includes a furnace body 2, a pedestal 3, a pedestal drive mechanism 4, and a wire rod. Coil dividing mechanisms 5a and 5b are provided.
The furnace body 2 is formed in a rectangular parallelepiped shape, and radiant tubes 6a, 6b, 6c, 6d, which are heating sources, are installed at predetermined positions on the hearth portion 21 of the furnace body 2. The furnace body 2 has an opening 22 for carrying the wire coil CL into and out of the furnace body 2. The opening 22 is formed in the front wall portion 23 of the furnace body 2, and the opening / closing door 7 for opening and closing the opening 22 is provided on the front wall portion 23 of the furnace body 2 so as to be slidable in the vertical direction. .

台座３は炉本体２の炉床部中央に設けられ、台座駆動機構４により上下方向に駆動されるようになっている。また、台座３は線材コイルＣＬの外径より若干大きい直径で形成されており、この台座３の上面には、後述する線材コイル分割機構５ａ，５ｂの線材コイル分割部材５１を受け入れる分割部材受入溝８ａ，８ｂが所定位置に形成されている。
線材コイル分割機構５ａ，５ｂは、台座３の周囲に互いに対向して配置されている。また、線材コイル分割機構５ａ，５ｂは台座３の上面に鉛直に載置された線材コイルＣＬを複数のコイル部に分割する線材コイル分割部材５１と、この線材コイル分割部材５１を線材コイルＣＬの径方向に駆動する駆動機構部５２とからなり、線材コイル分割部材５１は線材コイルＣＬの軸方向に沿ってほぼ櫛形に形成されている。 The pedestal 3 is provided in the center of the hearth of the furnace body 2 and is driven in the vertical direction by the pedestal drive mechanism 4. The pedestal 3 is formed with a diameter slightly larger than the outer diameter of the wire coil CL, and a split member receiving groove for receiving a wire coil split member 51 of the wire coil split mechanisms 5a and 5b described later is formed on the upper surface of the pedestal 3. 8a and 8b are formed at predetermined positions.
The wire coil splitting mechanisms 5a and 5b are arranged around the base 3 so as to face each other. The wire coil splitting mechanisms 5a and 5b include a wire coil split member 51 that splits the wire coil CL mounted vertically on the upper surface of the pedestal 3 into a plurality of coil portions, and the wire coil split member 51 is connected to the wire coil CL. The wire coil dividing member 51 is formed in a substantially comb shape along the axial direction of the wire coil CL.

このような熱処理炉１を用いて線材コイルＣＬに球状化焼鈍などの熱処理を施す場合には、まず、熱処理炉１の炉本体２に線材コイルＣＬを搬入し、図３（ａ）に示すように、台座３の上面に線材コイルＣＬを鉛直に載置する。次に、線材コイル分割機構５ａ，５ｂの駆動機構部５２を作動させて線材コイル分割部材５１を台座３に接近させ、図３（ｂ）に示すように、台座３の上面に載置された線材コイルＣＬを線材コイル分割機構５ａ，５ｂの線材コイル分割部材５１により複数のコイル部に分割する。その後、図３（ｃ）に示すように、台座駆動機構４を作動させて台座３を下降させ、この状態で線材コイルＣＬに熱処理を施す。   When heat treatment such as spheroidizing annealing is performed on the wire coil CL using such a heat treatment furnace 1, first, the wire coil CL is carried into the furnace body 2 of the heat treatment furnace 1, as shown in FIG. The wire coil CL is placed vertically on the upper surface of the base 3. Next, the drive mechanism 52 of the wire coil splitting mechanisms 5a and 5b is operated to bring the wire coil splitting member 51 closer to the pedestal 3 and placed on the upper surface of the pedestal 3 as shown in FIG. The wire coil CL is divided into a plurality of coil parts by the wire coil dividing member 51 of the wire coil dividing mechanisms 5a and 5b. Thereafter, as shown in FIG. 3C, the pedestal driving mechanism 4 is operated to lower the pedestal 3, and in this state, the wire coil CL is subjected to heat treatment.

このように、炭素鋼からなる線材コイルＣＬを熱処理炉１の台座３上に鉛直に載置して熱処理を施すに際して、台座３上に載置された線材コイルＣＬを台座３の周囲に配置された複数の線材コイル分割部材５１により複数のコイル部に分割した状態で線材コイルＣＬに熱処理を施すと、線材コイルＣＬを複数のコイル部に分割しないで熱処理を施した場合と比べて、炉本体２内の高温ガスと接触する線材コイルＣＬの表面面積が増大し、炉内熱が線材コイルＣＬに入熱しやすくなる。これにより、球状化焼鈍などの熱処理を施す際に線材コイル全体が所定の熱処理温度に達するまでに長時間を要することがないので、多量のエネルギを消費することなく線材コイルＣＬに熱処理を施すことができる。   As described above, when the wire coil CL made of carbon steel is vertically placed on the pedestal 3 of the heat treatment furnace 1 to perform the heat treatment, the wire coil CL placed on the pedestal 3 is disposed around the pedestal 3. When heat treatment is performed on the wire coil CL in a state where the wire coil CL is divided into a plurality of coil portions by the plurality of wire coil splitting members 51, the furnace main body is compared with a case where the heat treatment is performed without dividing the wire coil CL into the plurality of coil portions. The surface area of the wire coil CL that comes into contact with the high-temperature gas in 2 increases, and the heat in the furnace easily enters the wire coil CL. Thereby, when performing heat treatment such as spheroidizing annealing, it does not take a long time for the entire wire coil to reach a predetermined heat treatment temperature, so heat treatment is performed on the wire coil CL without consuming a large amount of energy. Can do.

なお、軸受鋼からなる線材コイル（直径：１２．５ｍｍ、重量：２トン）の球状化焼鈍を図４に示すような熱処理炉を用いて行い、線材コイル全体が７８０℃に加熱されるまでの加熱時間と冷却に要する時間を測定したところ、加熱時間が１５時間、冷却時間が１２時間であった。これに対し、軸受鋼からなる線材コイル（直径：１２．５ｍｍ、重量：２トン）の球状化焼鈍を図１及び図２に示すような熱処理炉１を用いて球状化焼鈍を行い、線材コイル全体が７８０℃に加熱されるまでの加熱時間と冷却に要する時間を測定したところ、加熱時間が９時間、冷却時間が７時間であった。   In addition, the spheroidizing annealing of the wire coil (diameter: 12.5 mm, weight: 2 tons) made of bearing steel is performed using a heat treatment furnace as shown in FIG. 4, and the entire wire coil is heated to 780 ° C. When the heating time and the time required for cooling were measured, the heating time was 15 hours and the cooling time was 12 hours. On the other hand, spheroidizing annealing of a wire rod coil (diameter: 12.5 mm, weight: 2 tons) made of bearing steel is performed using a heat treatment furnace 1 as shown in FIGS. When the heating time until the whole was heated to 780 ° C. and the time required for cooling were measured, the heating time was 9 hours and the cooling time was 7 hours.

図１及び図２に示した本発明の第１実施形態では、線材コイルＣＬの熱処理時に用いられる熱処理炉として、台座３の周囲に二つの線材コイル分割機構５ａ，５ｂを配置したものを示したが、線材コイル分割機構の数は二つに限定されるものではなく、三つ以上であってもよい。
また、台座３上に載置された線材コイルＣＬを複数のコイル部に分割する線材コイル分割部材として、線材コイルＣＬの軸方向に沿ってほぼ櫛形に形成されたものを示したが、線材コイル分割部材の形状は特に限定されるものではない。
図１及び図２に示した本発明の第１実施形態では、線材コイルＣＬの熱処理時に用いられる熱処理炉として、台座駆動機構４を備えたものを示したが、本発明は台座駆動機構４を備えていない熱処理炉についても適用可能である。 In the first embodiment of the present invention shown in FIG. 1 and FIG. 2, as a heat treatment furnace used at the time of heat treatment of the wire coil CL, two wire coil dividing mechanisms 5 a and 5 b are arranged around the base 3. However, the number of wire coil division mechanisms is not limited to two, and may be three or more.
In addition, as the wire coil dividing member for dividing the wire coil CL placed on the pedestal 3 into a plurality of coil parts, the wire coil formed in a substantially comb shape along the axial direction of the wire coil CL is shown. The shape of the dividing member is not particularly limited.
In the first embodiment of the present invention shown in FIG. 1 and FIG. 2, the heat treatment furnace used for the heat treatment of the wire coil CL has been provided with the pedestal drive mechanism 4. The present invention can also be applied to a heat treatment furnace not provided.

本発明の第１実施形態に係る熱処理炉の横断面図である。It is a cross-sectional view of the heat treatment furnace according to the first embodiment of the present invention. 図１のII−II線に沿う矢視断面図である。It is arrow sectional drawing which follows the II-II line | wire of FIG. 本発明に係る線材コイルの熱処理方法の一例を説明するための図である。It is a figure for demonstrating an example of the heat processing method of the wire coil which concerns on this invention. 線材コイルの熱処理に用いられる従来の熱処理を示す図である。It is a figure which shows the conventional heat processing used for the heat processing of a wire coil.

符号の説明Explanation of symbols

ＣＬ 線材コイル
２ 熱処理炉
２１ 炉床部
３ 台座
４ 台座駆動機構
５ａ，５ｂ 線材コイル分割機構
５１ 線材コイル分割部材
５２ 駆動機構部
６ａ，６ｂ，６ｃ，６ｄ ラジアントチューブ
７ 扉
８ａ，８ｂ 分割部材受入溝 CL wire rod coil 2 heat treatment furnace 21 hearth part 3 base 4 base drive mechanism 5a, 5b wire coil split mechanism 51 wire coil split member 52 drive mechanism 6a, 6b, 6c, 6d Radiant tube 7 door 8a, 8b split member receiving groove

Claims (2)

炭素鋼からなる線材コイルを熱処理炉の台座上に鉛直に載置して熱処理を施すに際して、
前記台座上に載置された線材コイルを前記台座の周囲に配置された複数の線材コイル分割部材により複数のコイル部に分割した状態で前記線材コイルに熱処理を施すことを特徴とする線材コイルの熱処理方法。 When the wire coil made of carbon steel is placed vertically on the pedestal of the heat treatment furnace and subjected to heat treatment,
A heat treatment is performed on the wire coil in a state in which the wire coil placed on the pedestal is divided into a plurality of coil portions by a plurality of wire coil dividing members arranged around the pedestal. Heat treatment method. 炭素鋼からなる線材コイルに熱処理を施すときに用いられ、炉本体と、該炉本体内に設けられた台座とを備えた熱処理炉において、
前記台座上に鉛直に載置された線材コイルを複数のコイル部に分割する複数の線材コイル分割機構を前記台座の周囲に配置したことを特徴とする熱処理炉。 Used when heat treating a wire coil made of carbon steel, in a heat treatment furnace comprising a furnace body and a pedestal provided in the furnace body,
A heat treatment furnace characterized in that a plurality of wire coil dividing mechanisms for dividing a wire coil vertically mounted on the pedestal into a plurality of coil portions are arranged around the pedestal.
JP2008076355A 2008-03-24 2008-03-24 Heat treatment method and heat treatment furnace for wire coil Expired - Fee Related JP5098734B2 (en)

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