JP2000345243A - Method for uniformly heating plural metallic wire rods and heating furnace - Google Patents
Method for uniformly heating plural metallic wire rods and heating furnaceInfo
- Publication number
- JP2000345243A JP2000345243A JP11158900A JP15890099A JP2000345243A JP 2000345243 A JP2000345243 A JP 2000345243A JP 11158900 A JP11158900 A JP 11158900A JP 15890099 A JP15890099 A JP 15890099A JP 2000345243 A JP2000345243 A JP 2000345243A
- Authority
- JP
- Japan
- Prior art keywords
- heating
- furnace
- heating furnace
- lower wall
- metal wires
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、複数本の金属線
材、例えばタイヤコード等に用いられる鋼線材を均一に
加熱する方法及び加熱炉に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a heating furnace for uniformly heating a plurality of metal wires, for example, a steel wire used for a tire cord or the like.
【０００２】[0002]
【従来の技術】複数本の金属線材、例えばタイヤコード
等に用いられる鋼線材を同時にパテンティング処理等の
熱処理を行うための加熱炉としては、熱効率がよく、経
済的である等の点から、金属線材と燃焼バーナーとの間
にマッフルを有さず加熱炎が直接通過線を加熱する、い
わゆる直火式加熱炉が広く用いられている。2. Description of the Related Art A heating furnace for simultaneously performing a heat treatment such as a patenting process on a plurality of metal wires, for example, a steel wire used for a tire cord or the like, has high thermal efficiency and is economical. A so-called direct-fired heating furnace in which a heating flame directly heats a passing line without a muffle between a metal wire and a combustion burner is widely used.
【０００３】直火式加熱炉としては、図３(a) に示すよ
うに、炉の両側壁102,103 に配置され水平方向に加熱炎
を噴出する対をなす燃焼バーナー104a,104b を加熱手段
とする水平炊き式加熱炉101 と、図４(a）に示すよう
に、上壁110 に配置され下方に向かって炎を噴出する燃
焼バーナー112a,112b を加熱手段とする天井炊き式加熱
炉107 とがある。[0003] As shown in Fig. 3 (a), as a direct-fired heating furnace, a pair of combustion burners 104a and 104b which are disposed on both side walls 102 and 103 of the furnace and eject a heating flame in a horizontal direction are used as heating means. As shown in FIG. 4 (a), a horizontal cooking type heating furnace 101 and a ceiling cooking type heating furnace 107 using combustion burners 112a and 112b arranged on the upper wall 110 and emitting downward flames as heating means. is there.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
直火式加熱炉101,107 は、いずれの形式においても炉の
下壁内面105,111 が平らであって、これと金属線材100
との距離が炉の幅方向で一定に構成されているのが一般
的であり、この構成では、加熱炉101,107 内に並置した
各金属線材100 への輻射熱が、以下に示す理由から幅方
向で一定にはならず、並置した複数本の金属線材100 を
均一に加熱することが困難であるという問題を有してい
る。However, in any of the conventional direct-fired heating furnaces 101 and 107, the inner surfaces 105 and 111 of the lower wall of the furnace are flat, and the furnaces 101 and 107 have the same structure.
Is generally constant in the width direction of the furnace.In this configuration, the radiant heat to the metal wires 100 juxtaposed in the heating furnaces 101 and 107 is reduced in the width direction for the following reason. There is a problem that it is not constant and it is difficult to uniformly heat the plurality of metal wires 100 arranged side by side.
【０００５】すなわち、水平炊き式加熱炉101 の場合に
は、炉の幅方向の中央部に位置する金属線材は炉の側壁
102,103 からの輻射熱をほとんど受けないのに対し、前
記幅方向の端部側に位置する金属線材は側壁102,103 か
らの輻射熱を多く受けるため、各金属線材を同じ速度で
炉内を通過させると、前記幅方向端部側に位置する金属
線材ほど単位体積あたりの入熱量が多くなるのに伴って
線材温度が高くなる傾向があり、その結果、図３(b) に
示すように、炉内の幅方向に並置した各金属線材の温度
分布はＵ字状となり、並置した金属線材の全てを均一加
熱することは困難であるからである。That is, in the case of the horizontal cooking type heating furnace 101, the metal wire located at the center in the width direction of the furnace is connected to the side wall of the furnace.
While the metal wires located at the end portions in the width direction receive much radiant heat from the side walls 102 and 103 while the radiant heat from the metal wires 102 and 103 are hardly received, when each metal wire is passed through the furnace at the same speed, The metal wire located closer to the width direction end tends to have a higher wire temperature as the heat input per unit volume increases, and as a result, as shown in FIG. This is because the temperature distribution of the metal wires arranged side by side in the direction becomes U-shaped, and it is difficult to uniformly heat all the metal wires arranged side by side.
【０００６】また、天井炊き式加熱炉107 の場合には、
燃焼バーナー112a,112b の加熱炎による温度分布が水平
炊き式よりも不均一であるため、前記加熱炎を噴出する
方向に位置する金属線材100 は、高温に加熱されて単位
体積あたりの入熱量が多くなるのに伴って線材温度が高
くなる傾向があり、その結果、例えば図４(a) に示すよ
うに２個の燃焼バーナー112a,112b を配設した場合に
は、図４(b) に示すように、炉内の幅方向に並置した各
金属線材の温度分布はＭ字状となり、並置した金属線材
の全てを均一加熱することは困難であるからである。In the case of a ceiling-cooked heating furnace 107,
Since the temperature distribution due to the heating flame of the combustion burners 112a and 112b is more non-uniform than that of the horizontal cooking type, the metal wire 100 positioned in the direction in which the heating flame is ejected is heated to a high temperature and the heat input per unit volume is reduced. As the wire rod temperature increases, the wire temperature tends to increase. As a result, for example, when two combustion burners 112a and 112b are provided as shown in FIG. As shown in the figure, the temperature distribution of the metal wires arranged side by side in the width direction in the furnace becomes M-shaped, and it is difficult to uniformly heat all the metal wires arranged side by side.
【０００７】ところで、例えば高炭素鋼線材のパテンテ
ィング処理を行う場合には、鋼線材を所定温度に加熱し
て完全にオーステナイト化する必要があるが、加熱しす
ぎると鋼中の結晶粒が粗大化し、これに起因して延性が
劣化する傾向があるため、適正な温度範囲内で線材を加
熱することが要求される。[0007] For example, when a patenting process is performed on a high carbon steel wire, it is necessary to heat the steel wire to a predetermined temperature to completely austenitize the steel wire. Since the ductility tends to deteriorate due to this, it is required to heat the wire within an appropriate temperature range.
【０００８】従って、上述した従来の直火式加熱炉101,
107 は、いずれの方式とも、並置した複数本の線材の全
てを均一に加熱するのは困難である。即ち、前記線材の
全てを完全にオーステナイト化する温度に炉内温度を設
定すると、適正温度範囲よりも高い温度に加熱される線
材が不可避的に発生し、製品歩留り等の悪化を招くから
である。Accordingly, the above-described conventional direct-fired heating furnace 101,
In any of the methods, it is difficult to uniformly heat all of the multiple wires arranged side by side. That is, if the furnace temperature is set to a temperature at which all of the wires are completely austenitized, wires heated to a temperature higher than the appropriate temperature range are inevitably generated, resulting in deterioration of product yield and the like. .
【０００９】尚、従来の水平炊き式加熱炉101 の場合に
は、炉の側壁102,103 からの輻射熱による線材の不均一
温度分布を緩和するための手段として、炉の幅方向端部
側に位置する金属線材と炉の側壁102,103 との間の距離
を大きく設定すること (例えば数10ｃｍ以上）、具体的
には、炉の両側壁102,103 間距離を大きくすることが有
用であるが、この構成だと、炉内に無駄な空間が生じる
ことになり、これに伴って加熱炉全体も大きくなり、炉
面積当たりの生産性が劣るため好ましくない。Incidentally, in the case of the conventional horizontal cooking type heating furnace 101, as a means for alleviating the non-uniform temperature distribution of the wire due to the radiant heat from the side walls 102 and 103 of the furnace, it is located at the widthwise end of the furnace. It is useful to increase the distance between the metal wire and the side walls 102 and 103 of the furnace (for example, several tens cm or more), specifically, to increase the distance between the side walls 102 and 103 of the furnace. In addition, a wasteful space is generated in the furnace, and accordingly, the entire heating furnace becomes large, which is not preferable because productivity per furnace area is inferior.
【００１０】そこで、この発明の目的は、炉の下壁から
の輻射熱による金属線材への入熱量を、炉の幅方向にわ
たって適正に制御することによって、並置した複数本の
金属線材を均一に加熱する方法及び加熱炉を提供するこ
とにある。尚、この発明は、例えばタイヤコード等に用
いられる鋼線材をパテンティング処理等の熱処理を行う
のに適している。Therefore, an object of the present invention is to control the amount of heat input to a metal wire by the radiant heat from the lower wall of the furnace appropriately in the width direction of the furnace, thereby uniformly heating a plurality of juxtaposed metal wires. And a heating furnace. The present invention is suitable, for example, for performing a heat treatment such as a patenting treatment on a steel wire used for a tire cord or the like.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するた
め、第１発明は、上壁、下壁、前後側壁及び左右側壁か
らなる炉壁によって炉内空間を区画形成する炉壁を有す
る加熱炉内に複数本の金属線材を並置し、該金属線材
を、それらの上方位置に配置された加熱手段によって加
熱する際に、前記加熱によって炉内から受ける各金属線
材の単位体積あたりの入熱量に応じて、並置した金属線
材の下壁内面からの距離を、加熱炉の幅方向断面で見
て、異ならせることを特徴とする、複数本の金属線材を
均一に加熱する方法である。According to a first aspect of the present invention, there is provided a heating furnace having a furnace wall which defines a furnace space by a furnace wall including an upper wall, a lower wall, front and rear side walls, and left and right side walls. When a plurality of metal wires are juxtaposed, and the metal wires are heated by heating means arranged above them, the heat input per unit volume of each metal wire received from the furnace by the heating is A method for uniformly heating a plurality of metal wires, characterized in that the distance from the inner surface of the lower wall of the juxtaposed metal wires is made different according to the cross section in the width direction of the heating furnace.
【００１２】また、前記金属線材の下壁内面からの距離
は、前記入熱量が少ないほど短いことが好ましく、より
好適には、最大値が最小値の1.5 倍以上である。尚、前
記金属線材の下壁内面からの距離は、下壁内面を***さ
せることによって短く設定することが好ましい。The distance from the inner surface of the lower wall of the metal wire is preferably shorter as the heat input is smaller, and more preferably, the maximum value is at least 1.5 times the minimum value. It is preferable that the distance from the inner surface of the lower wall of the metal wire is set short by raising the inner surface of the lower wall.
【００１３】加えて、加熱炉の設置スペースの狭小化や
炉面積当たりの生産性を向上させる必要がある場合に
は、前記金属線材のうち、左右側壁に最も近い位置にあ
る金属線材と該側壁間を炉の幅方向に沿って測定した距
離は、いずれも１５ｃｍ以下であることが好ましい。[0013] In addition, when it is necessary to reduce the installation space of the heating furnace and to improve the productivity per furnace area, the metal wire closest to the left and right side walls among the metal wires and the side wall may be used. The distance measured along the width direction of the furnace is preferably 15 cm or less.
【００１４】また、第２発明は、上壁、下壁、前後側壁
及び左右側壁からなる炉壁と、該左右側壁間に間隔をお
いて並置された複数本の金属線材の上方位置に、これら
の金属線材を加熱するための加熱手段とを有する加熱炉
において、前記加熱によって炉内から受ける各金属線材
の単位体積あたりの入熱量に応じて、並置した金属線材
の下壁内面からの距離を、加熱炉の幅方向断面で見て、
異ならせることを特徴とする複数本の金属線材を均一に
加熱する加熱炉である。In a second aspect of the present invention, a furnace wall comprising an upper wall, a lower wall, front and rear side walls, and left and right side walls, and a plurality of metal wires arranged side by side between the left and right side walls, In a heating furnace having a heating means for heating the metal wire, the distance from the inner wall of the lower wall of the juxtaposed metal wires is determined according to the heat input per unit volume of each metal wire received from the furnace by the heating. Looking at the cross section of the heating furnace in the width direction,
A heating furnace for uniformly heating a plurality of metal wires characterized by being different.
【００１５】前記加熱炉は、例えば複数本の金属線材を
連続的に炉内を通過させて加熱する連続熱処理炉である
ことが好ましい。[0015] The heating furnace is preferably a continuous heat treatment furnace for heating a plurality of metal wires by continuously passing the inside of the furnace.
【００１６】加えて、前記加熱炉は、具体的には、左右
側壁に配置され水平方向に加熱炎を噴出する対をなす燃
焼バーナーを加熱手段とする水平炊き式加熱炉である
か、又は、上壁に配置され下方に向かって加熱炎を噴出
する燃焼バーナーを加熱手段とする天井炊き式加熱炉で
あることが好ましく、前者の場合には、前記金属線材の
下壁内面からの距離を、炉の幅方向中央部位置でその幅
方向端部位置よりも短くし、一方、後者の場合には、前
記金属線材の下壁内面からの距離を、加熱炎による熱影
響を大きく受ける金属線材よりもそれ以外の金属線材で
短くすることが必要である。[0016] In addition, the heating furnace may be a horizontal cooking-type heating furnace having a pair of combustion burners arranged on the left and right side walls and emitting a heating flame in a horizontal direction as heating means, or It is preferable that the heating device is a ceiling-burning heating furnace that uses a combustion burner that is disposed on the upper wall and emits a heating flame downward, and in the former case, the distance from the lower wall inner surface of the metal wire is In the width direction central portion of the furnace is shorter than its width direction end position, on the other hand, in the latter case, the distance from the lower wall inner surface of the metal wire is larger than the metal wire greatly affected by the heating flame. Needs to be shortened with other metal wires.
【００１７】さらに、前記金属線材の下壁内面からの距
離は、前記入熱量の少ない金属線材の直下位置にある下
壁部分のみを***させることによって短く設定すること
が好ましく、前記***は、平坦な下壁内面上に耐火レン
ガのブロック、耐火金属のブロック又は箱を載置するこ
とによって形成することがより好適である。Further, it is preferable that the distance from the inner surface of the lower wall of the metal wire is set to be short by raising only the lower wall portion located immediately below the metal wire having a small heat input. More preferably, it is formed by placing a refractory brick block, a refractory metal block or a box on the inner surface of a suitable lower wall.
【００１８】[0018]
【発明の実施の形態】以下にこの発明の実施の形態を図
面に示すところに基づいて説明する。図１(a) 及び(b)
は、第１発明の一の実施形態である加熱方法を実施する
ために用いた第２発明の一の実施形態である水平炊き式
加熱炉１を、その長手方向に沿ってそれぞれ水平方向及
び垂直方向に切断したものであり、また、図２は図１
(a) のＡ−Ａ線上で切断したものであり、いずれも加熱
炉の炉内状態を説明するための図であり、図中１は加熱
炉、２は上壁、３は下壁、４〜７は側壁、８は金属線
材、9a及び9bは加熱手段、10は炉内空間、11は金属線材
の移動方向、12は輻射熱発生部材である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Figures 1 (a) and (b)
A horizontal cooking type heating furnace 1 according to one embodiment of the second invention used for carrying out a heating method according to one embodiment of the first invention is horizontally and vertically moved along its longitudinal direction. 2 is shown in FIG.
(a) is a view cut along the line AA, all of which are diagrams for explaining the furnace interior state of the heating furnace, where 1 is a heating furnace, 2 is an upper wall, 3 is a lower wall, Reference numerals 7 to 7 denote side walls, 8 denotes a metal wire, 9a and 9b denote heating means, 10 denotes a furnace space, 11 denotes a moving direction of the metal wire, and 12 denotes a radiant heat generating member.
【００１９】図１(a),(b) に示す加熱炉１は、上壁２、
下壁３、左右側壁４，５及び前後側壁６，７からなる炉
壁と、左右側壁４，５間に間隔をおいて並置された複数
本の金属線材8a,8b,--,8n の上方位置に、これらの金属
線材8a,8b,--,8n を加熱するための加熱手段9a,9b （加
熱手段9a,9b は図２にのみ示す。）とを有し、炉壁によ
って炉内空間10が区画形成されている連続熱処理炉であ
ある。The heating furnace 1 shown in FIGS. 1 (a) and 1 (b) has an upper wall 2,
Above the furnace wall composed of the lower wall 3, the left and right side walls 4, 5 and the front and rear side walls 6, 7 and the plurality of metal wires 8a, 8b,-, 8n juxtaposed at intervals between the left and right side walls 4, 5 In the position, heating means 9a, 9b (heating means 9a, 9b are shown only in FIG. 2) for heating these metal wires 8a, 8b,-, 8n are provided. Reference numeral 10 denotes a continuous heat treatment furnace in which compartments are formed.
【００２０】尚、図１では、水平炊き式加熱炉の構成を
示すため、その加熱手段9a,9b は、図２に示すように、
対をなす燃焼バーナーを、水平方向に加熱炎を噴出する
ように左右側壁に配置した場合を示してあるが、これだ
けには限定されない。例えば、天井炊き式加熱炉の場合
には、加熱手段9a,9b は、図４(a) に示すように燃焼バ
ーナーを上壁に下方に向かって加熱炎を噴出するように
配置すればよい。In FIG. 1, the heating means 9a and 9b are arranged as shown in FIG.
Although the case where the paired combustion burners are arranged on the left and right side walls so as to eject the heating flame in the horizontal direction is shown, the invention is not limited to this. For example, in the case of a ceiling-cooked heating furnace, the heating means 9a and 9b may be arranged such that a combustion burner blows a heating flame downward toward the upper wall as shown in FIG.
【００２１】そして、第１発明の加熱方法の構成上の主
な特徴は、上記加熱炉１内で前記金属線材8a,8b,--,8n
を加熱する際に、前記加熱によって加熱炉１内から受け
る各金属線材8a,8b,--,8n の単位体積あたりの入熱量に
応じて、並置した金属線材8a,8b,--,8n の下壁内面3aか
らの距離La,Lb,--,Ln を、加熱炉１の幅方向断面（図２
参照）で見て、異ならせることにあり、この構成を採用
することによって、並置した複数本の金属線材の全てを
均一に加熱することが可能になる。The main feature of the structure of the heating method of the first invention is that the metal wires 8a, 8b,-, 8n
When heating the metal wires 8a, 8b,-, 8n received from the heating furnace 1 by the heating according to the heat input per unit volume of each of the metal wires 8a, 8b,-, 8n. The distance La, Lb,-, Ln from the inner surface 3a of the lower wall is taken as the widthwise cross section of the heating furnace 1 (FIG. 2).
See FIG. 2), the arrangement is different, and by adopting this configuration, it is possible to uniformly heat all of the plurality of metal wires arranged side by side.
【００２２】以下に、上記発明を完成させるに至った経
緯を作用とともに説明する。発明者は、まず加熱炉内で
並置した金属線材がどのように加熱されるかについて詳
細に調査した。A description will now be given of how the above-mentioned invention has been completed, together with its operation. The inventor first investigated in detail how a metal wire rod juxtaposed in a heating furnace was heated.
【００２３】その結果、加熱炉内で前記金属線材が受け
る熱は、加熱炉の上記いずれの形式の相違に依らず、主
に、(1) 高温雰囲気ガスからの伝導熱、(2) 炉の側壁か
らの輻射熱及び(3) 炉の下壁からの輻射熱の３つの複合
熱によるものであること、また、高温雰囲気ガスからの
伝導熱が金属線材が接する雰囲気ガス及び熱伝達率に依
存し、炉の側壁及び下壁からの輻射熱がいずれも各々の
側壁及び下壁と線材との距離の影響が大きく、即ち、こ
の距離が短いほど線材が受ける輻射熱が大きくなること
が判明した。As a result, the heat received by the metal wire in the heating furnace mainly depends on (1) conduction heat from the high-temperature atmosphere gas and (2) (3) radiation heat from the lower wall of the furnace due to the combined heat of three, and the conduction heat from the high-temperature atmosphere gas depends on the atmosphere gas and the heat transfer coefficient with which the metal wire contacts, It has been found that the radiant heat from the side wall and the lower wall of the furnace is greatly affected by the distance between each side wall and the lower wall and the wire, that is, the shorter the distance is, the larger the radiant heat received by the wire becomes.
【００２４】次に、従来の加熱炉において、前記金属線
材を均一に加熱できないという問題点が生じる理由につ
いて検討したところ、（炉の下壁が平らである）従来の
水平炊き式加熱炉の場合には、高温雰囲気ガスからの伝
導熱及び炉の下壁からの輻射熱により受ける入熱量は、
いずれの金属線材ともほぼ等しいが、炉の側壁、特に左
右側壁からの輻射熱により受ける入熱量が、左右側壁側
に近い位置にある金属線材ほど大きくなり、図3(b)に示
すようなＵ字状の不均一温度分布をとることになるから
であり、また、（炉の下壁が平らである）従来の天井炊
き式加熱炉の場合には、加熱炎の分布が炉の幅方向で不
均一でありこれに伴って高温ガス雰囲気も同様に不均一
になり、この雰囲気ガスの伝導熱差が生じることにより
線材の温度分布に不均一になるからであることが分かっ
た。Next, the reason why the problem that the metal wire cannot be heated uniformly in the conventional heating furnace was examined. In the case of the conventional horizontal cooking type heating furnace (the lower wall of the furnace is flat). The amount of heat input received by the conduction heat from the high-temperature atmosphere gas and the radiant heat from the lower wall of the furnace is
Although almost the same as any metal wire, the amount of heat input received by the radiant heat from the side wall of the furnace, particularly the right and left side walls, becomes larger as the metal wire is closer to the left and right side walls, and has a U-shape as shown in FIG. 3 (b). In addition, in the case of a conventional ceiling-fired heating furnace (in which the bottom wall of the furnace is flat), the distribution of the heating flame is not uniform in the width direction of the furnace. It was found that the temperature distribution was uniform, and the high-temperature gas atmosphere was also non-uniform accordingly, and the temperature distribution of the wire was non-uniform due to the difference in conduction heat of the atmospheric gas.
【００２５】そこで、発明者は、従来の加熱炉の問題点
を解決するため鋭意検討を行ったところ、上記いずれの
形式の加熱炉の場合であっても、炉の下壁からの輻射熱
を炉の幅方向に制御することによって、並置した金属線
材の全てを均一に加熱することができることを見出し
た。The inventor of the present invention has conducted intensive studies to solve the problems of the conventional heating furnace. In any of the above-described heating furnaces, the radiant heat from the lower wall of the furnace is used for the heating furnace. It has been found that by controlling in the width direction, all of the juxtaposed metal wires can be uniformly heated.
【００２６】即ち、従来の加熱炉では、炉の下壁内面が
平らであり、各金属線材と下壁内面との距離は一律に等
しく設定されていたが、この発明では、炉の下壁内面を
平らにしないで、その所定位置だけを***させることな
どによって、前記距離を異ならせること、より具体的に
は、並置された複数本の金属線材のうち、入熱量が相対
的に少ない金属線材の下方に位置する下壁内面のみを隆
起させることによって、入熱量が相対的に少ない金属線
材が、下壁からの輻射熱による入熱量が相対的に高ま
り、並置された複数本の金属線材のそれぞれに対する入
熱量がをほぼ等しくすることができ、この結果として、
並置した金属線材の全てを均一に加熱することができる
ことを見出したのである。That is, in the conventional heating furnace, the inner surface of the lower wall of the furnace is flat, and the distance between each metal wire and the inner surface of the lower wall is uniformly set. The distance is made different by raising only a predetermined position without flattening, more specifically, among a plurality of juxtaposed metal wires, a metal wire having a relatively small heat input. By raising only the lower wall inner surface located below, the metal wire having a relatively small heat input, the heat input by the radiant heat from the lower wall is relatively increased, and each of the plurality of metal wires arranged side by side And the heat input to can be made approximately equal, resulting in
They have found that all of the juxtaposed metal wires can be heated uniformly.
【００２７】さらに具体的に言えば、水平炊き式加熱炉
の場合には、炉の下壁内面が平らであるとすると、図３
(b) に示すように、炉の幅方向中央部位置にある金属線
材が、幅方向端部位置にある金属線材よりも線材温度が
低くなる傾向があるため、かかる場合には、前記金属線
材の下壁内面からの距離を、炉の幅方向中央部位置でそ
の幅方向端部位置よりも短くすることによって、並置し
た金属線材の全てを均一に加熱することができる。More specifically, in the case of a horizontal cooking type heating furnace, if the inner surface of the lower wall of the furnace is flat, FIG.
As shown in (b), the metal wire at the center in the width direction of the furnace tends to have a lower wire temperature than the metal wire at the end in the width direction. By making the distance from the inner surface of the lower wall shorter at the center of the furnace in the width direction than at the end of the furnace in the width direction, all the juxtaposed metal wires can be uniformly heated.
【００２８】また、天井炊き式加熱炉の場合には、炉の
下壁内面が平らであるとすると、図４(b) に示すよう
に、加熱炎による熱影響を大きく受ける金属線材がそれ
以外の金属線材よりも温度が高くなる傾向があるため、
かかる場合には、前記金属線材の下壁内面からの距離
を、加熱炎による熱影響を大きく受ける金属線材よりも
それ以外の金属線材で短くすることによって、並置した
金属線材の全てを均一に加熱することができる。In the case of a ceiling-cooked heating furnace, assuming that the inner surface of the lower wall of the furnace is flat, as shown in FIG. Because the temperature tends to be higher than the metal wire of
In such a case, all the juxtaposed metal wires are uniformly heated by shortening the distance from the inner surface of the lower wall of the metal wire with a metal wire other than the metal wire greatly affected by the heat flame. can do.
【００２９】尚、前記金属線材を均一に加熱するには、
天井炊き式加熱炉よりも、加熱効率の高い水平炊き式加
熱炉の方が好ましい。In order to uniformly heat the metal wire,
A horizontal heating furnace having a higher heating efficiency is more preferable than a ceiling heating furnace.
【００３０】前記金属線材の下壁内面からの距離を調整
するための手段としては、前記距離を短くする下壁内面
位置のみを***させることが好ましく、この***は、例
えば平坦な下壁内面上に耐火レンガのブロック、耐火金
属のブロック又は箱を載置することによって形成するこ
とができ、これによれば、炉の下壁内面が平らである従
来の加熱炉を用いることができ、設備コストの点で有利
になる。As means for adjusting the distance from the lower wall inner surface of the metal wire, it is preferable to raise only the lower wall inner surface position which shortens the distance. Can be formed by placing a refractory brick block, a refractory metal block or a box on it, and according to this, it is possible to use a conventional heating furnace in which the inner surface of the lower wall of the furnace is flat, and equipment cost is reduced. It is advantageous in terms of.
【００３１】また、この発明では、前記***を、下壁内
面3a上に輻射熱発生部材12を載置することによって形成
する場合には、かかる輻射熱発生部材12を載置した下壁
内面部分については、輻射熱発生部材の内面を下壁内面
位置とする。According to the present invention, when the bulge is formed by mounting the radiant heat generating member 12 on the lower wall inner surface 3a, the lower wall inner surface portion on which the radiant heat generating member 12 is mounted is not required. The inner surface of the radiant heat generating member is defined as the lower wall inner surface position.
【００３２】そして、第１発明の加熱方法は、上述した
加熱炉内に並置した金属線材8a,8b,--,8n を一定の速度
で図１(a),(b) の矢印方向11に移動させ、炉内空間10内
を所定時間で通過させることによって前記金属線材8a,8
b,--,8n を連続的に均一に加熱することができる。The heating method according to the first aspect of the present invention is a method of heating the metal wires 8a, 8b,-, 8n juxtaposed in the heating furnace at a constant speed in the direction of arrow 11 in FIGS. 1 (a) and 1 (b). The metal wires 8a, 8 are moved and passed through the furnace space 10 for a predetermined time.
b,-, 8n can be continuously and uniformly heated.
【００３３】また、この発明は、炉の下壁からの輻射熱
を制御することによって金属線材への入熱量を一定にす
ることができるが、下壁からの輻射熱を線材温度に大き
く反映させる必要がある場合には、前記金属線材の下壁
内面からの距離は、最大値が最小値の1.5 倍以上に設定
することが好ましい。According to the present invention, the amount of heat input to the metal wire can be made constant by controlling the radiant heat from the lower wall of the furnace. However, it is necessary to reflect the radiant heat from the lower wall to the wire temperature. In some cases, the distance from the inner surface of the lower wall of the metal wire is preferably set such that the maximum value is at least 1.5 times the minimum value.
【００３４】さらに、加熱炉の設置スペースの制限があ
るか、又は炉面積当たりの生産性をより一層向上させる
必要がある場合には、加熱炉内に並置された金属線材の
うち、左右側壁に最も近い位置にある金属線材と該側壁
間を炉の幅方向に沿って測定した距離は、いずれも１５
ｃｍ以下に設定することが好適である。Further, when there is a restriction on the installation space of the heating furnace or when it is necessary to further improve the productivity per furnace area, of the metal wires arranged side by side in the heating furnace, the right and left side walls are provided. The distance measured between the nearest metal wire and the side wall along the width direction of the furnace was 15
cm or less is preferable.
【００３５】尚、ここまでは、いずれも加熱炉の構造上
の問題から生ずる金属線材の不均一温度分布を均一にす
るための技術について述べてきたが、この発明は、この
ような加熱炉の構造上の問題の有無に関わらず、異なる
線径の金属線材を均一に加熱することも可能にすること
ができる。Although a technique for making the nonuniform temperature distribution of the metal wire uniform due to a structural problem of the heating furnace has been described above, the present invention relates to such a heating furnace. Irrespective of the presence or absence of a structural problem, it is also possible to uniformly heat metal wires having different wire diameters.
【００３６】即ち、線径の異なる複数本の金属線材を従
来の加熱炉で加熱するとき、仮に加熱炉から受ける入熱
量が各金属線材とも同じであるとしても、線径が異なる
場合には、金属線材は、その単位長さあたりの体積が線
径に依存して異なるため、前記体積が小さいほど線材温
度が高くなり、その結果、これらの金属線材を均一に加
熱することは難しかったが、この発明では、かかる場合
であっても、前記加熱によって炉内から受ける各金属線
材の単位体積あたりの入熱量に応じて、並置した金属線
材の下壁内面からの距離を、加熱炉の幅方向断面で見
て、異ならせることによって、異なる線径の金属線材を
均一に加熱することが可能にすることができる。That is, when heating a plurality of metal wires having different wire diameters in a conventional heating furnace, even if the heat input received from the heating furnace is the same for each metal wire, if the wire diameters are different, Since the metal wire has a volume per unit length that differs depending on the wire diameter, the wire temperature increases as the volume decreases, and as a result, it was difficult to heat these metal wires uniformly. In this invention, even in such a case, the distance from the lower wall inner surface of the juxtaposed metal wires to the width direction of the heating furnace is determined in accordance with the heat input per unit volume of each metal wire received from inside the furnace by the heating. By making them different in cross section, it is possible to uniformly heat metal wires having different wire diameters.
【００３７】上述したところは、この発明の実施形態の
一例を示したにすぎず、請求の範囲において種々の変更
を加えることができる。The above is merely an example of the embodiment of the present invention, and various changes can be made within the scope of the claims.
【００３８】[0038]
【実施例】次に、この発明に従う加熱方法によって、線
径が1.7 mmである42本の高炭素鋼線材（線番１〜42）に
同時にパテンティング処理を施し、各鋼線材の機械的特
性を評価したので以下で説明する。EXAMPLE Next, by the heating method according to the present invention, 42 high carbon steel wires (wire numbers 1 to 42) having a wire diameter of 1.7 mm were simultaneously patented, and the mechanical properties of each steel wire were Is described below.
【００３９】加熱炉は、図１及び図２に示す水平炊き式
連続加熱炉であり、その寸法が、炉内全長が20ｍ、炉内
幅が0.74ｍ、炉内高さが0.53ｍであり、炉内設定温度を
1025℃とし、炉の下壁内面3a上の幅方向中央位置に、長
さが3.8 ｍ、幅が0.34ｍ及び厚さが0.045 ｍである５個
の耐火レンガブロックを４個の線材支持部材と交互に載
置した。The heating furnace is a horizontal cooking type continuous heating furnace shown in FIGS. 1 and 2 and has dimensions of a total furnace length of 20 m, a furnace width of 0.74 m, and a furnace height of 0.53 m. Set the furnace temperature
Five refractory brick blocks with a length of 3.8 m, a width of 0.34 m and a thickness of 0.045 m are connected to four wire support members at a central position in the width direction on the lower wall inner surface 3 a of the furnace at 1025 ° C. They were placed alternately.
【００４０】左側壁４とこれに最も近接する鋼線材（線
番１）との間を炉の幅方向に沿って測定した距離はいず
れも13ｃｍとした。また、各鋼線材と炉の下壁との距離
(mm)、炉の出口で測定した鋼線材温度 (℃）、並びにパ
テンティング処理後の各鋼線材の抗張力(MPa）及び絞り
（％）について測定した結果については表１に示す。The distance measured along the width direction of the furnace between the left side wall 4 and the steel wire rod (wire number 1) closest to the left side wall was 13 cm. Also, the distance between each steel wire and the bottom wall of the furnace
Table 1 shows the measurement results of the steel wire temperature (° C.) measured at the outlet of the furnace, the tensile strength (MPa) and the drawing (%) of each steel wire after the patenting treatment.
【００４１】尚、上記測定は、42本の鋼線材の全てで行
ったが、表１には、同様な測定結果については特に示さ
ず、適当に選択した11本の鋼線材についての測定結果の
みを示してあり、表１中の抗張力と絞りの数値はいずれ
も平均値である。The above measurements were performed on all 42 steel wires, but Table 1 does not specifically show the same measurement results. Only the measurement results on 11 appropriately selected steel wires are shown. The numerical values of tensile strength and aperture in Table 1 are all average values.
【００４２】比較のため、炉の下壁内面が平らである図
３(a) に示す従来の水平炊き式加熱炉で同様な条件下で
パテンティング処理を行い、同様な項目について測定し
たので、それらの測定結果を表２に示す。For comparison, a patenting process was performed under the same conditions in a conventional horizontal cooking type heating furnace shown in FIG. 3A in which the inner surface of the lower wall of the furnace was flat, and the same items were measured. Table 2 shows the measurement results.
【００４３】[0043]
【表１】 [Table 1]
【００４４】[0044]
【表２】 [Table 2]
【００４５】表１及び表２の測定結果を比較すると、従
来の加熱炉 (従来例）でパテンティング処理を行ったと
きの炉出口での線材温度 (表２）は、最低で920 ℃、最
高で935 ℃、これらの温度差が15℃と大きいのに対し
て、この発明の加熱炉 (実施例）でパテンティング処理
を行ったときの炉出口での線材温度は、最低で930 ℃、
最高で935 ℃、これらの温度差が５℃と1/3 に縮小さ
れ、加熱炉内に並置された線材はほぼ均一に加熱されて
いるのがわかる。Comparing the measurement results in Tables 1 and 2, the wire temperature (Table 2) at the furnace outlet when the patenting process was performed in the conventional heating furnace (conventional example) was 920 ° C. at the minimum and 920 ° C. at the maximum. 935 ° C, and the temperature difference between them was as large as 15 ° C, whereas the wire temperature at the furnace outlet at the time of patenting in the heating furnace (Example) of the present invention was at least 930 ° C,
The maximum temperature was 935 ° C, and the temperature difference was reduced to 1/3, 5 ° C. It can be seen that the wires placed side by side in the heating furnace were heated almost uniformly.
【００４６】また、パテンティング処理後の各鋼線材の
抗張力及び絞りの数値に関しては、、従来例は、抗張力
が最低で1250MPa 、最高で1288MPa 、これらの差が38MP
a と大きく、絞り値も、最低で43.3％、最高で51.5％、
これらの差が8.2 ％と大きいのに対して、実施例は、抗
張力が最低で1270MPa 、最高で1288MPa 、これらの差が
18MPa と従来例の半分以下に縮小され、絞り値も、最低
で43.6％、最高で47.2％、これらの差が3.6 ％と従来例
の半分以下に縮小されており、実施例では、加熱炉内に
並置された線材が上記均一加熱に伴い、各線材とも所期
したとおりの機械的強度が得られている。Regarding the values of tensile strength and drawing of each steel wire rod after the patenting treatment, the conventional example has a tensile strength of 1250 MPa at the minimum and 1288 MPa at the maximum and a difference of 38 MPa between them.
a large, aperture value is 43.3% at the minimum, 51.5% at the maximum,
While these differences are as large as 8.2%, the examples show that the tensile strength is as low as 1270MPa and as high as 1288MPa.
18MPa, which is less than half of the conventional example, and the aperture value is 43.6% at the minimum and 47.2% at the maximum, and the difference between them is 3.6%, which is reduced to less than half of the conventional example. As a result of the uniform heating of the wires juxtaposed with each other, the expected mechanical strength of each wire is obtained.
【００４７】特に、従来例では、炉の幅方向両端側に位
置する線番１、２、41及び42の鋼線材は、伸線加工時の
断線発生が多く伸線加工性の生産性を悪化させるが、実
施例では、前記平均値からの差が縮小されることでかか
る鋼線材においても適正な抗張力と絞りが得られる結
果、伸線加工時の断線が減少し、生産性が向上する。加
えて、従来例では、線番１〜6 及び37〜42（計12線番）
が所期した機械的特性が得られないため、かかる線番に
ついて減線することも考えられるが、実施例では、これ
らの線番についても同時にパテンティング処理できるの
で、生産性が向上すると同時に熱効率が高まり、コスト
を削減することができる。In particular, in the conventional example, the steel wire rods having wire numbers 1, 2, 41 and 42 located at both ends in the width direction of the furnace often cause wire breakage during wire drawing and deteriorate productivity of wire drawing. However, in the examples, the difference from the average value is reduced, so that even in such a steel wire, an appropriate tensile strength and drawing can be obtained. As a result, disconnection during wire drawing is reduced and productivity is improved. In addition, in the conventional example, wire numbers 1 to 6 and 37 to 42 (total 12 wire numbers)
However, it is conceivable to reduce the number of such wire numbers because the expected mechanical properties cannot be obtained.However, in the embodiment, since these wire numbers can also be subjected to the patenting process at the same time, the productivity is improved and the thermal efficiency is improved. And cost can be reduced.
【００４８】さらに、実施例では、炉の幅方向の線材温
度をほぼ均一にすることができるので、従来よりも精密
な加熱を行うことができ、各鋼線材の機械的特性のばら
つきを減少できるため、従来実現できなかったレベルの
高抗張力のスチールコードが実現できる伸線材をを供給
できる。Further, in the embodiment, since the wire temperature in the width direction of the furnace can be made substantially uniform, it is possible to perform more precise heating than before, and to reduce the variation in the mechanical properties of each steel wire. For this reason, it is possible to supply a drawn wire capable of realizing a steel cord having a high tensile strength at a level that cannot be realized conventionally.
【００４９】[0049]
【発明の効果】この発明によれば、水平炊き式や天井炊
き式の加熱方式に依らず、加熱炉内に並置した複数本の
金属線材を均一に加熱することができ、加えて、金属線
材の線径が異なる場合であっても、同様に金属線材を均
一に加熱することができる。According to the present invention, a plurality of metal wires arranged side by side in a heating furnace can be uniformly heated regardless of a heating method of a horizontal cooking type or a ceiling cooking type. Even if the wire diameters of the metal wires are different, the metal wire can be similarly heated uniformly.
【図１】 第１発明の加熱方法に使用した加熱炉の炉内
状態を示す図であり、(a) は水平断面図であり、(b) は
垂直断面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the inside of a heating furnace used in the heating method of the first invention, wherein (a) is a horizontal sectional view and (b) is a vertical sectional view.
【図２】 図１のＡ−Ａ断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】 (a) は従来の水平炊き式加熱炉の幅方向断面
図であり、(b) は(a) の加熱炉内に並置した複数本の金
属線材の温度の傾向を示す図である。FIG. 3 (a) is a cross-sectional view in the width direction of a conventional horizontal cooking type heating furnace, and FIG. 3 (b) is a view showing a temperature trend of a plurality of metal wires arranged side by side in the heating furnace of (a). is there.
【図４】 (a) は従来の天井炊き式加熱炉の幅方向断面
図であり、(b) は(a) の加熱炉内に並置した複数本の金
属線材の温度の傾向を示す図である。FIG. 4 (a) is a cross-sectional view in the width direction of a conventional ceiling-fired heating furnace, and FIG. 4 (b) is a diagram showing a temperature trend of a plurality of metal wires arranged side by side in the heating furnace of (a). is there.
１ 加熱炉 ２ 上壁 ３ 下壁 ４〜７ 側壁 8,8a,8b,-- ,8n 金属線材 9a, 9bは加熱手段 10 炉内空間 11 金属線材の移動方向 12 輻射熱発生部材 DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Upper wall 3 Lower wall 4-7 Side wall 8,8a, 8b,-, 8n Metal wire 9a, 9b is heating means 10 Furnace space 11 Moving direction of metal wire 12 Radiation heat generating member
Claims (11)
なる炉壁によって炉内空間を区画形成する加熱炉内に複
数本の金属線材を並置し、該金属線材を、それらの上方
位置に配置された加熱手段によって加熱する際に、前記
加熱によって炉内から受ける各金属線材の単位体積あた
りの入熱量に応じて、並置した金属線材の下壁内面から
の距離を、加熱炉の幅方向断面で見て、異ならせること
を特徴とする、複数本の金属線材を均一に加熱する方
法。1. A plurality of metal wires are juxtaposed in a heating furnace that defines a furnace space by a furnace wall including an upper wall, a lower wall, front and rear side walls, and left and right side walls, and the metal wires are positioned above the metal wires. When heating by the heating means disposed in the furnace, the distance from the lower wall inner surface of the juxtaposed metal wires to the width of the heating furnace is determined in accordance with the heat input per unit volume of each metal wire received from the inside of the furnace by the heating. A method for uniformly heating a plurality of metal wires, characterized in that the wires are made different in a cross section in the direction.
前記入熱量が少ないほど短く設定する請求項１に記載の
複数本の金属線材を均一に加熱する方法。2. The distance from the lower wall inner surface of the metal wire is
The method for heating a plurality of metal wires uniformly according to claim 1, wherein the shorter the heat input, the shorter the heat input.
最大値が最小値の1.5 倍以上に設定する請求項１又は２
に記載の複数本の金属線材を均一に加熱する方法。3. The distance from the inner surface of the lower wall of the metal wire is
The maximum value is set to 1.5 times or more of the minimum value.
3. The method for uniformly heating a plurality of metal wires according to item 1.
下壁内面を***させることによって短く設定する請求項
１、２又は３に記載の複数本の金属線材を均一に加熱す
る方法。4. The distance from the inner surface of the lower wall of the metal wire is
4. The method for uniformly heating a plurality of metal wires according to claim 1, wherein the length is set shorter by raising the inner surface of the lower wall.
い位置にある金属線材と該側壁間を炉の幅方向に沿って
測定した距離は、いずれも１５ｃｍ以下である請求項１
〜４のいずれか１項に記載の複数本の金属線材を均一に
加熱する方法。5. The distance between the metal wire closest to the left and right side walls and the distance between the side walls of the metal wire along the furnace width direction is 15 cm or less.
5. The method for uniformly heating a plurality of metal wires according to any one of the above-described items 4 to 4.
なる炉壁と、該左右側壁間に間隔をおいて並置された複
数本の金属線材の上方位置に、これらの金属線材を加熱
するための加熱手段とを有する加熱炉において、 前記加熱によって炉内から受ける各金属線材の単位体積
あたりの入熱量に応じて、並置した金属線材の下壁内面
からの距離を、加熱炉の幅方向断面で見て、異ならせる
ことを特徴とする複数本の金属線材を均一に加熱する加
熱炉。6. A heating furnace comprising an upper wall, a lower wall, front and rear side walls and left and right side walls, and a plurality of metal wires arranged side by side between the left and right side walls and heated above the metal wires. In accordance with the heat input per unit volume of each metal wire received from inside the furnace by the heating, the distance from the lower wall inner surface of the juxtaposed metal wires to the width of the heating furnace. A heating furnace for uniformly heating a plurality of metal wires, characterized in that they are made different when viewed in a direction cross section.
的に炉内を通過させて加熱する連続熱処理炉である請求
項６に記載の加熱炉。7. The heating furnace according to claim 6, wherein the heating furnace is a continuous heat treatment furnace for heating a plurality of metal wires by continuously passing the inside of the furnace.
方向に加熱炎を噴出する対をなす燃焼バーナーを加熱手
段とする水平炊き式加熱炉であり、前記金属線材の下壁
内面からの距離は、炉の幅方向中央部位置でその幅方向
端部位置よりも短く設定する請求項６又は７に記載の加
熱炉。8. The heating furnace according to claim 1, wherein the heating furnace is a horizontal cooking type heating furnace having a heating means disposed on left and right side walls and serving as a pair of combustion burners for injecting a heating flame in a horizontal direction. The heating furnace according to claim 6, wherein the distance is set to be shorter at the center position in the width direction of the furnace than at the end position in the width direction.
かって加熱炎を噴出する燃焼バーナーを加熱手段とする
天井炊き式加熱炉であり、前記金属線材の下壁内面から
の距離は、加熱炎による熱影響を大きく受ける金属線材
よりもそれ以外の金属線材で短く設定する請求項６又は
７に記載の加熱炉。9. The heating furnace is a ceiling-cooking heating furnace using a combustion burner which is disposed on an upper wall and emits a heating flame downward, as a heating means, and a distance from the lower wall inner surface of the metal wire is: 8. The heating furnace according to claim 6, wherein the other metal wires are set to be shorter than the metal wires that are greatly affected by the heat flame.
は、前記入熱量の少ない金属線材の直下位置にある下壁
部分のみを***させることによって短く設定する請求項
６〜９のいずれか１項に記載の加熱炉。10. The metal wire rod according to claim 6, wherein the distance from the lower wall inner surface is set short by raising only the lower wall portion immediately below the metal wire rod having a small heat input. The heating furnace according to the paragraph.
レンガのブロック、耐火金属のブロック又は箱を載置す
ることによって形成する請求項１０に記載の加熱炉。11. The heating furnace according to claim 10, wherein the ridge is formed by placing a block of refractory brick, a block of refractory metal or a box on the inner surface of the flat lower wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15890099A JP3993340B2 (en) | 1999-06-07 | 1999-06-07 | Method and heating furnace for uniformly heating a plurality of metal wires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15890099A JP3993340B2 (en) | 1999-06-07 | 1999-06-07 | Method and heating furnace for uniformly heating a plurality of metal wires |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000345243A true JP2000345243A (en) | 2000-12-12 |
| JP3993340B2 JP3993340B2 (en) | 2007-10-17 |
Family
ID=15681829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15890099A Expired - Lifetime JP3993340B2 (en) | 1999-06-07 | 1999-06-07 | Method and heating furnace for uniformly heating a plurality of metal wires |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3993340B2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5235710A (en) * | 1975-09-16 | 1977-03-18 | Ulvac Corp | In-material-heat reflection plate device in heating furnaces |
| JPS61201721A (en) * | 1985-03-05 | 1986-09-06 | Kobe Steel Ltd | Edge heater with curved heat collection surface |
| JPS6347339A (en) * | 1986-08-18 | 1988-02-29 | Mitsubishi Heavy Ind Ltd | Radiation cooler for metallic strip |
| JPH0271089A (en) * | 1987-09-09 | 1990-03-09 | Tokyo Gas Co Ltd | Heating method for substance to be heated in heating furnace |
| JPH059596A (en) * | 1991-06-28 | 1993-01-19 | Aichi Steel Works Ltd | Heat treating device for metallic wire having metallic gloss |
-
1999
- 1999-06-07 JP JP15890099A patent/JP3993340B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5235710A (en) * | 1975-09-16 | 1977-03-18 | Ulvac Corp | In-material-heat reflection plate device in heating furnaces |
| JPS61201721A (en) * | 1985-03-05 | 1986-09-06 | Kobe Steel Ltd | Edge heater with curved heat collection surface |
| JPS6347339A (en) * | 1986-08-18 | 1988-02-29 | Mitsubishi Heavy Ind Ltd | Radiation cooler for metallic strip |
| JPH0271089A (en) * | 1987-09-09 | 1990-03-09 | Tokyo Gas Co Ltd | Heating method for substance to be heated in heating furnace |
| JPH059596A (en) * | 1991-06-28 | 1993-01-19 | Aichi Steel Works Ltd | Heat treating device for metallic wire having metallic gloss |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3993340B2 (en) | 2007-10-17 |
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