JPS6330370B2 - - Google Patents
Info
- Publication number
- JPS6330370B2 JPS6330370B2 JP58183552A JP18355283A JPS6330370B2 JP S6330370 B2 JPS6330370 B2 JP S6330370B2 JP 58183552 A JP58183552 A JP 58183552A JP 18355283 A JP18355283 A JP 18355283A JP S6330370 B2 JPS6330370 B2 JP S6330370B2
- Authority
- JP
- Japan
- Prior art keywords
- heating
- hearth
- wire
- furnace
- zone
- 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.)
- Expired
Links
- 238000010438 heat treatment Methods 0.000 claims description 41
- 230000001590 oxidative effect Effects 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 5
- 238000002791 soaking Methods 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【発明の詳細な説明】 本発明は線材の加熱方法に関するものである。[Detailed description of the invention] The present invention relates to a method of heating a wire.
従来、炭素鋼、ステンレス鋼、合金鋼等からな
る線材を加熱する場合、加熱炉の耐火物製炉床上
に通線し、炉内に還元性雰囲気を導入しつつラジ
アントチユープバーナ等の間接加熱により、主と
して炉内壁の輻射熱により加熱していた。 Conventionally, when heating wire rods made of carbon steel, stainless steel, alloy steel, etc., the wire was passed over the refractory hearth of the heating furnace, and a reducing atmosphere was introduced into the furnace while indirect heating was performed using a radiant tube burner, etc. As a result, heating was mainly done by radiant heat from the inner walls of the furnace.
しかしながら、前記従来方法では、主として輻
射熱による加熱であるため、急速加熱ができず、
加熱時間が長い。つまり、炉長が長くなり、炉自
体が大型化し、設備費が高くなるとともに、炉外
への放熱量も大きくなつて燃費がかかるという欠
点を有する。 However, in the conventional method, since heating is mainly performed by radiant heat, rapid heating is not possible.
Heating time is long. In other words, the furnace length becomes longer, the furnace itself becomes larger, equipment costs become higher, and the amount of heat radiated to the outside of the furnace increases, resulting in increased fuel consumption.
また、還元性雰囲気を必要とするため、それだ
けランニングコストが向上するという欠点をも有
していた。 Furthermore, since a reducing atmosphere is required, running costs are increased accordingly.
ところで、本発明者は、細い線材にあつては、
短時間で急速加熱する場合、雰囲気が弱酸化領域
であつても完全な無酸化雰囲気におけると同様の
スケールレス加熱（無酸化加熱）が可能であるこ
とを見出した。また、バーナの燃焼生成ガスを炉
床表面に沿うように噴射させると炉床上の線材は
バーナによるフレームインピンジと、炉床からの
直接伝熱とにより急速に加熱されることが判明し
ている。 By the way, the present inventor has discovered that when it comes to thin wires,
It has been found that when heating rapidly in a short period of time, scaleless heating (non-oxidizing heating) similar to that in a completely non-oxidizing atmosphere is possible even if the atmosphere is in a weakly oxidizing region. Furthermore, it has been found that when the combustion generated gas of the burner is injected along the hearth surface, the wire on the hearth is rapidly heated due to flame impingement by the burner and direct heat transfer from the hearth.
本発明は、前記の事実を考慮してなされたもの
であつて、炉高が低く、炉長も短い加熱炉で還元
性雰囲気を使用することなく無酸化雰囲気と同等
雰囲気で線材を加熱し省エネルギーを図ることの
できる線材の加熱方法を提供しようとするもので
ある。 The present invention has been made in consideration of the above-mentioned facts, and saves energy by heating the wire in an atmosphere equivalent to a non-oxidizing atmosphere without using a reducing atmosphere in a heating furnace with a low furnace height and a short furnace length. The purpose of the present invention is to provide a method for heating wire rods that can achieve the following.
つぎに、本発明を一実施例である図面にしたが
つて説明する。 Next, the present invention will be explained with reference to the drawings which are one embodiment.
加熱炉１は、天井部にエア供給部３を備えた完
全燃焼帯である予熱帯２、天井部に高速度バーナ
５を前記予熱帯２側に傾斜して設けた加熱帯４お
よび炉側壁部にバーナ７を備えた均熱帯６とから
なる。そして、予熱帯２の線材Ｗの装入口８側天
井部には排ガス温度調節のための大気吸引手段１
０、熱交換器１１を有する排ガスダクト９が設け
てある。なお、前記加熱炉１の炉床は平坦耐火物
製である。 The heating furnace 1 includes a preheating zone 2 which is a complete combustion zone equipped with an air supply section 3 on the ceiling, a heating zone 4 in which a high speed burner 5 is installed on the ceiling and inclined toward the preheating zone 2, and a furnace side wall. and a soaking zone 6 equipped with a burner 7. Atmospheric suction means 1 is provided on the ceiling on the side of the wire charging port 8 of the preheating zone 2 to adjust the temperature of the exhaust gas.
0, an exhaust gas duct 9 with a heat exchanger 11 is provided. Note that the hearth of the heating furnace 1 is made of flat refractory material.
前記高速度バーナ５は空燃比1.0以下、好まし
くは、0.7〜0.9で燃焼させるもので、バーナ５か
らの燃焼生成ガスフレームは予熱帯２に向つて斜
め方向に噴出し、炉床表面に沿つて無酸化雰囲気
（正確には弱酸化性雰囲気）層Ｓを形成する。す
なわち、炉高はバーナ５からのフレームが前述の
ように炉床表面に沿つて流れるように低くなつて
いる。 The high-speed burner 5 burns at an air-fuel ratio of 1.0 or less, preferably 0.7 to 0.9, and the combustion generated gas flame from the burner 5 is ejected obliquely toward the preheating zone 2 and along the hearth surface. A non-oxidizing atmosphere (more precisely, a weakly oxidizing atmosphere) layer S is formed. That is, the furnace height is lowered so that the flame from the burner 5 flows along the hearth surface as described above.
なお、予熱帯２には、前記加熱帯４、均熱帯６
からの排ガスが流入するが、排ガス中の未燃分は
エア供給部３から供給される空気により完全燃焼
して排ガスダクト９から、たとえば熱交換器を通
して放出される。 The preheating zone 2 includes the heating zone 4 and the soaking zone 6.
The unburned components in the exhaust gas are completely combusted by the air supplied from the air supply section 3 and are discharged from the exhaust gas duct 9, for example, through a heat exchanger.
つぎに、前記構成からなる加熱炉で線材Ｗを加
熱する方法を説明する。 Next, a method of heating the wire W in the heating furnace configured as described above will be explained.
いま、前記各バーナ３，５および７を作動さ
せ、線材Ｗを装入口８から通線すると、線材Ｗは
予熱帯２で予熱されたのち加熱帯４で加熱され
る。この場合、線材Ｗは高速度バーナ５によつて
炉床上に形成された無酸化雰囲気層Ｓを通過する
とともに、燃焼生成ガスフレームインピンジと高
温の炉床からの直接伝熱により急速加熱される。
このように、線材Ｗは急速加熱されるため、加熱
時間は従来のものに比べて短時間でよい。すなわ
ち、線材Ｗは弱酸化性のほぼ無酸化雰囲気に近い
雰囲気中で短時間急速加熱されるので、スケール
レス加熱が行なわれる。そして、前記のように加
熱された線材は均熱帯６を経て炉外に抽出される
ことになる。前記加熱工程のヒートカーブは第３
図に示す通りである。なお、前記実施例は高速度
バーナ５の空燃比を0.7〜0.8としたものである
が、1.0以下であれば、ほぼ同等効果を奏する。 Now, when the burners 3, 5, and 7 are operated and the wire W is passed through the charging port 8, the wire W is preheated in the preheating zone 2 and then heated in the heating zone 4. In this case, the wire W passes through a non-oxidizing atmosphere layer S formed on the hearth by the high-speed burner 5, and is rapidly heated by combustion product gas flame impingement and direct heat transfer from the high-temperature hearth.
In this way, since the wire W is rapidly heated, the heating time may be shorter than that of the conventional wire. That is, since the wire W is rapidly heated for a short time in a weakly oxidizing, almost non-oxidizing atmosphere, scaleless heating is performed. Then, the wire rod heated as described above is extracted from the furnace through a soaking zone 6. The heat curve of the heating step is the third
As shown in the figure. In the above embodiment, the air-fuel ratio of the high-speed burner 5 was set to 0.7 to 0.8, but if it is 1.0 or less, almost the same effect can be achieved.
また、前記実施例では、高速度バーナ５を炉天
井に固定配置したものであるが、揺動可能とし、
線材Ｗの材質等によつて傾斜角度を変化させ、無
酸化雰囲気層Ｓの厚みあるいはフレームインピン
ジを調整するようにしてもよい。さらに、バーナ
７をも前記高速度バーナとしてもよいことは勿論
である。 Further, in the above embodiment, the high-speed burner 5 is fixedly arranged on the furnace ceiling, but it is made swingable.
The inclination angle may be changed depending on the material of the wire W to adjust the thickness of the non-oxidizing atmosphere layer S or the frame impingement. Furthermore, it goes without saying that the burner 7 may also be the high-speed burner.
以上の説明で明らかなように、本発明にかかる
線材の加熱方法によれば、少なくとも線材にスケ
ールを発生させる加熱帯域におけるバーナを空燃
比1.0以下で燃焼させる高速度バーナとし、その
発生する弱酸化性雰囲気をもつて従来の還元性雰
囲気の代りとするとともに、高速度バーナのフレ
ームを炉床上に沿つて流すため、高速度バーナは
炉床から近い位置に設置する必要があり、加熱炉
を炉高の低いものとすることができる。また、線
材の加熱をフレームインピンジと炉床からの直接
加熱とで急速に行なうため加熱帯の短い加熱炉と
することができる。 As is clear from the above explanation, according to the wire heating method according to the present invention, at least the burner in the heating zone where scale is generated in the wire is a high-speed burner that burns at an air-fuel ratio of 1.0 or less, and the weak oxidation that occurs The high-speed burner must be installed close to the hearth because the flame of the high-speed burner flows along the hearth, and the heating furnace is placed close to the hearth. It can be either high or low. Furthermore, since the wire is rapidly heated by flame impingement and direct heating from the hearth, the heating furnace can have a short heating zone.
このように、加熱炉は、炉高が低く、かつ、炉
長が短くなるので熱放散が少なく、還元性雰囲気
を使用しないため、省エネルギーを図ることがで
きるという効果を奏する。さらに、加熱帯からの
排ガスは予熱帯にて供給されるエアにより完全燃
焼されるため、この排ガス熱をも利用でき、一層
の省エネルギーを図ることもできる。 As described above, the heating furnace has a low furnace height and a short furnace length, so there is little heat dissipation, and since a reducing atmosphere is not used, energy can be saved. Furthermore, since the exhaust gas from the heating zone is completely combusted by the air supplied in the preheating zone, the heat of this exhaust gas can also be used, making it possible to further save energy.
第１図は本発明を実施する加熱炉の断面図、第
２図は第１図の−線断面図で、第３図はヒー
トカープである。
１〜加熱炉、２〜予熱帯、４〜加熱帯、５〜高
速度バーナ、６〜均熱帯、Ｓ〜無酸化雰囲気層、
Ｗ〜線材。
FIG. 1 is a sectional view of a heating furnace in which the present invention is implemented, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is a heat curve. 1 - heating furnace, 2 - pre-preparation zone, 4 - heating zone, 5 - high speed burner, 6 - soaking zone, S - non-oxidizing atmosphere layer,
W ~ Wire rod.
Claims (1)
する線材の加熱方法において、前記加熱炉の予熱
帯にエア供給部を配設するとともに、少なくとも
加熱帯天井部に空燃比1.0以下で燃焼させる高速
度バーナを予熱帯側に傾斜して複数基配置し、こ
の高速度バーナからの燃焼生成ガスを炉床に向け
て噴射させ、炉床表面に無酸化雰囲気層を形成さ
せて、線材を前記高速度バーナからの燃焼生成ガ
スフレームインピンジと炉床からの直接伝熱とに
より急速加熱するとともに、排ガス中の未燃分を
前記エア供給部から供給される空気により完全燃
焼させることを特徴とする線材の加熱方法。1. In a heating method for heating a wire by passing it over a flat refractory hearth of a heating furnace, an air supply section is provided in the preheating zone of the heating furnace, and at least the ceiling of the heating zone is provided with an air-fuel ratio of 1.0 or less. A plurality of high-speed burners for combustion are arranged at an angle toward the preheating zone, and the combustion generated gas from the high-speed burners is injected toward the hearth to form a non-oxidizing atmosphere layer on the hearth surface. is rapidly heated by combustion generated gas flame impingement from the high-speed burner and direct heat transfer from the hearth, and unburned content in the exhaust gas is completely combusted by air supplied from the air supply section. A heating method for wire rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18355283A JPS6075526A (en) | 1983-09-30 | 1983-09-30 | Process for heating wire rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18355283A JPS6075526A (en) | 1983-09-30 | 1983-09-30 | Process for heating wire rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6075526A JPS6075526A (en) | 1985-04-27 |
| JPS6330370B2 true JPS6330370B2 (en) | 1988-06-17 |
Family
ID=16137797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18355283A Granted JPS6075526A (en) | 1983-09-30 | 1983-09-30 | Process for heating wire rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6075526A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005025627B3 (en) * | 2005-06-03 | 2006-10-05 | Graf + Cie Ag | Production of sawtooth wire clothing for textile carding comprises cutting saw teeth in wire and hardening it by heating in protective atmosphere to austenite-forming temperature and rapidly cooling it, wire then being annealed |
| JP6355103B2 (en) * | 2014-09-11 | 2018-07-11 | 大阪瓦斯株式会社 | Heating apparatus and heating method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49109A (en) * | 1972-04-19 | 1974-01-05 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5910124Y2 (en) * | 1979-12-26 | 1984-03-30 | 大阪瓦斯株式会社 | heating furnace |
-
1983
- 1983-09-30 JP JP18355283A patent/JPS6075526A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49109A (en) * | 1972-04-19 | 1974-01-05 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6075526A (en) | 1985-04-27 |
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