JP3088903B2 - Prevention of meandering and slippage of metal strip in continuous heat treatment furnace - Google Patents
Prevention of meandering and slippage of metal strip in continuous heat treatment furnaceInfo
- Publication number
- JP3088903B2 JP3088903B2 JP06108162A JP10816294A JP3088903B2 JP 3088903 B2 JP3088903 B2 JP 3088903B2 JP 06108162 A JP06108162 A JP 06108162A JP 10816294 A JP10816294 A JP 10816294A JP 3088903 B2 JP3088903 B2 JP 3088903B2
- Authority
- JP
- Japan
- Prior art keywords
- meandering
- heat treatment
- gas
- metal strip
- treatment furnace
- 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 - Fee Related
Links
Landscapes
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、連続熱処理炉内の金属
帯蛇行及びスリップ防止方法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 for preventing meandering and slippage of a metal band in a continuous heat treatment furnace.
【０００２】[0002]
【従来の技術】連続焼鈍炉等の連続熱処理炉を用いた熱
処理は、鋼帯を炉内に配設した搬送ロールにより移動
（搬送）しつつ加熱、均熱、冷却等の熱処理を施すもの
であるが、このように鋼帯を連続的に搬送ロールによっ
て移動しつつ熱処理を施すと、鋼帯が搬送ロール巾方向
両端部へ移行するいわゆる蛇行現象が生じることがあ
り、極端な場合は鋼帯がロール外へ位置し鋼帯端部が折
損することになる。このような鋼帯の蛇行やロールと鋼
帯とのスリップ等を防止するため、例えば特開昭５５−
１００９１９号公報や特公平６−４８９４号公報に開示
されているごとく、ロール表面の粗度を調整したり、ロ
ール表面のクラウンを改良する等して蛇行やスリップ等
を防止することが知られている。2. Description of the Related Art In a heat treatment using a continuous heat treatment furnace such as a continuous annealing furnace, heat treatment such as heating, soaking, and cooling is performed while a steel strip is moved (transported) by a transport roll disposed in the furnace. However, if the heat treatment is performed while the steel strip is continuously moved by the transport rolls in this way, a so-called meandering phenomenon in which the steel strip shifts to both ends in the width direction of the transport roll may occur. Is located outside the roll, and the end of the steel strip is broken. In order to prevent such meandering of the steel strip and slipping between the roll and the steel strip, see, for example,
As disclosed in Japanese Patent Application Laid-Open No. 100919 and Japanese Patent Publication No. 6-4894, it is known to prevent meandering and slippage by adjusting the roughness of the roll surface or improving the crown of the roll surface. I have.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、ロール
表面の粗度を調整してスリップ等を防止する方法におい
ては、ロール表面に形成した粗度（凹凸）によって金属
帯表面に疵が発生することがあるうえにロール表面の粗
度を種々変更することはコスト的にも不利であり、さら
に、ロール表面のクラウンを改良して蛇行やスリップ等
を防止する方法においては、クラウン量をアップすると
金属帯の長手方向にしわが発生するいわゆるヒートバッ
クルを誘発することがあり、かつクラウン変更によるコ
ストアップを免れることはできない。しかも、通板中に
スリップ等が発生すると金属帯表面に疵が発生するので
通板速度を低下させる必要があり平均通板速度が低下し
て生産性を低下させる等の課題がある。本発明はこのよ
うな課題を有利に解決するためになされたものであり、
連続熱処理炉内の通板金属帯の蛇行等を確実に防止する
方法を提供することを目的とするものである。However, in the method for preventing slippage by adjusting the roughness of the roll surface, flaws may occur on the surface of the metal strip due to the roughness (unevenness) formed on the roll surface. In addition, changing the roughness of the roll surface in various ways is disadvantageous in terms of cost.Furthermore, in the method of improving the roll surface crown to prevent meandering and slipping, increasing the amount of crown increases the metal band. This may induce a so-called heat buckle in which wrinkles are generated in the longitudinal direction, and increase in cost due to changing the crown cannot be avoided. In addition, if slippage or the like occurs during sheet passing, a flaw is generated on the surface of the metal strip, so that it is necessary to reduce the sheet passing speed, and there is a problem that the average sheet passing speed is reduced and the productivity is reduced. The present invention has been made to advantageously solve such problems,
It is an object of the present invention to provide a method for reliably preventing meandering of a continuous metal strip in a continuous heat treatment furnace.
【０００４】[0004]
【課題を解決するための手段】前記のような課題を解決
した本発明に係る連続熱処理炉内の通板金属帯蛇行及び
スリップ防止方法は、熱処理炉内搬送ロールと金属帯と
の噛込み部位に2.5 ×10 -5 Pa・S 以下の低粘性ガスを吹
付けることを特徴とするものである。According to the present invention, there is provided a method for preventing meandering and slipping of a continuous metal strip in a continuous heat treatment furnace according to the present invention. Low-viscosity gas of 2.5 × 10 -5 Pa · S or less .
【０００５】[0005]
【作用】このような連続熱処理炉内の通板金属帯蛇行防
止方法は、熱処理炉内搬送ロールと金属帯との噛込み部
位に2.5 ×10 -5 Pa・S 以下の低粘性ガスを吹付けること
により金属帯と搬送ロール間に介在される気体の膜厚を
小さくするとともにこの気体の膜が搬送ロールと金属帯
間の金属帯のロール接触長の略全長に亘り行きわたるよ
うにし、これにより金属帯のスリップ等の発生を防ごう
とするものである。金属帯蛇行の発生原因の１つは搬送
ロールと金属帯のミクロスリップであることが知られて
おり、スリップを防止することと蛇行を防止することは
同時に達成すことができる。即ち、本発明者等は連続熱
処理炉内の金属帯の蛇行及びスリップ等につき種々検討
した結果、搬送ロールと金属帯の間に金属帯の通板によ
って炉内雰囲気ガス（約720 〜900 ℃）が捲き込まれて
炉内雰囲気ガスの被膜が形成され、そのガス被膜の膜厚
が厚くなる程金属帯と搬送ロール間の摩擦力が低下し、
蛇行やスリップ等が発生することが明らかになった。特
に、金属帯の通板速度が高速になると金属帯と搬送ロー
ル間に捲き込む炉内雰囲気ガスも多くなるので、ガス被
膜の膜厚の増加量が一層顕著になり蛇行及びスリップ等
の発生が起こり易くなる。更に金属帯と搬送ロール間に
介在されるガス被膜の膜厚はガスの粘性に深く関わり合
っていることも明らかになった。According to such a method for preventing meandering of a metal strip in a continuous heat treatment furnace, a low-viscosity gas of 2.5 × 10 -5 Pa · S or less is blown to a portion where the transfer roll and the metal band in the heat treatment furnace are engaged. This reduces the film thickness of the gas interposed between the metal band and the transport roll, and allows the gas film to extend over substantially the entire length of the roll contact length of the metal band between the transport roll and the metal belt, thereby The purpose is to prevent the occurrence of slip of the metal strip. It is known that one of the causes of the occurrence of the meandering of the metal band is a micro-slip between the transport roll and the metal band, and the prevention of the slip and the prevention of the meandering can be achieved at the same time. That is, as a result of various studies on the meandering and slippage of the metal band in the continuous heat treatment furnace, the present inventors found that the atmosphere gas in the furnace (about 720 to 900 ° C.) was formed by passing the metal band between the transport roll and the metal band. Is rolled up to form a film of the atmosphere gas in the furnace, and as the film thickness of the gas film increases, the frictional force between the metal band and the transport roll decreases,
It became clear that meandering and slipping occurred. In particular, when the passing speed of the metal strip is increased, the atmosphere gas in the furnace which is wound between the metal strip and the transport roll also increases, so that the amount of increase in the film thickness of the gas film becomes more remarkable, and meandering and slipping occur. It is easy to happen. It was also found that the thickness of the gas film interposed between the metal strip and the transport roll was deeply related to the viscosity of the gas.
【０００６】そこで、搬送ロールと金属帯との噛込み部
位へいくつかの粘性の異なるガスが介在されるように吹
き付けて金属帯の蛇行発生の有無について種々実験した
結果、2.5 ×10 -5 Pa・S 以下の粘性の低いガスを吹付け
ることによって金属帯の蛇行等を確実に防止できること
を確認した。即ち、2.5 ×10 -5 Pa・S 以下の低粘性のガ
スを搬送ロールと金属帯との噛込み部位に吹付けて搬送
ロールと金属帯との噛込み部位での雰囲気を低粘性にす
ることにより、ガスが搬送ロールと金属帯間に巻き込ま
れ形成されるガス被膜が薄くなり、金属帯が搬送ロール
表面の微細凹凸の凸部に接触し、金属帯が搬送ロールに
よって正確に通板され蛇行及びスリップ等を確実に防止
することができることを確認した。[0006] Then, various experiments were carried out on whether or not the metal strip meandered by spraying some gas having different viscosities to the biting portion between the transport roll and the metal strip, and as a result, 2.5 × 10 -5 Pa was obtained. -It was confirmed that the meandering of the metal strip could be reliably prevented by blowing low viscosity gas of S or less . That is, a low-viscosity gas of 2.5 × 10 -5 Pa · S or less is sprayed to the biting portion between the transport roll and the metal band to lower the atmosphere at the biting portion between the transport roll and the metal band. As a result, gas is caught between the transport roll and the metal strip, the gas coating formed becomes thinner, the metal strip contacts the convexities of the fine irregularities on the transport roll surface, and the metal strip is accurately passed by the transport roll and meanders It was confirmed that slip and the like could be reliably prevented.
【０００７】このように本発明は搬送ロールと金属帯と
の噛込み部位に2.5 ×10 -5 Pa・S 以下の低粘性のガスを
吹付けて金属帯の蛇行及びスリップ等を防止するもので
あるが、連続熱処理炉は一般に加熱帯、冷却帯と順次搬
送ロールによって金属帯を移動（通板）しつつ熱処理を
するものであり、特に、蛇行及びスリップ等の発生し易
い個所例えば加熱帯の前段等に適用することによって確
実に蛇行及びスリップ等を防止することができる。As described above, the present invention is to prevent the metal strip from meandering and slipping by spraying a low-viscosity gas of 2.5 × 10 -5 Pa · S or less onto the biting portion between the transport roll and the metal strip. However, a continuous heat treatment furnace generally performs a heat treatment while moving (passing) a metal band by a heating roll, a cooling zone, and a transport roll sequentially, and particularly in a place where meandering and slipping are likely to occur, such as a heating zone. By applying to the former stage or the like, meandering and slipping can be reliably prevented.
【０００８】次に、低粘性のガスとしては、例えば、鋼
帯の連続焼鈍炉等の熱処理炉においては一般に窒素ガス
約95％、残水素ガスで炉内雰囲気ガスが構成されるよう
に炉内雰囲気ガスが窒素系ガスとして鋼帯表面の酸化物
を還元しつつ熱処理を施すことから、例えば炉内ガスの
一部を取出しこれを2.5 ×10 -5 Pa・S 以下に低粘性化し
て前記のごとく搬送ロールと鋼帯との噛込み部位に吹付
ける等、炉内の雰囲気ガス組成を大きく変動しないよう
なものが好ましい。[0008] Next, as a low-viscosity gas, for example, in a heat treatment furnace such as a continuous annealing furnace for steel strips, generally, about 95% of a nitrogen gas and a residual hydrogen gas are used so that an atmosphere gas in the furnace is constituted. Since the atmosphere gas is subjected to heat treatment while reducing oxides on the surface of the steel strip as a nitrogen-based gas, for example, a part of the furnace gas is taken out and reduced in viscosity to 2.5 × 10 -5 Pa It is preferable that the atmosphere gas composition in the furnace does not fluctuate greatly, such as spraying the portion between the conveyor roll and the steel strip.
【０００９】また、上記のごとき低粘性ガスは、2.5 ×
10-5Pa・S 以下としておくことにより金属帯の蛇行等は
特に確実に防止することができる。また、このような2.
5 ×10-5Pa・S 以下の低粘性ガスを得るには、窒素ガス
温度を約２００℃以下にすることによって容易に確保す
ることができる。The low-viscosity gas as described above has a size of 2.5 ×
By setting the pressure to 10 -5 Pa · S or less, meandering of the metal band can be particularly reliably prevented. Also like this 2.
In order to obtain a low-viscosity gas of 5 × 10 −5 Pa · S or less, it can be easily ensured by setting the nitrogen gas temperature to about 200 ° C. or less.
【００１０】次に、本発明方法の一例を図面によって説
明する。図１において、１は連続熱処理炉、２、２ａ・
・・は連続熱処理炉１内に配置される搬送ロール、３は
搬送ロール２、２ａ・・・により搬送される鋼帯、４、
４ａ・・・は鋼帯３の巾方向全巾の噛込み部位に指向配
置される吹き込みノズルであり、この吹付けノズル４、
4a・・・により搬送ロール２、２ａ・・・と鋼帯３との
噛込み部位に低粘性窒素ガスを吹付ける。Next, an example of the method of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a continuous heat treatment furnace, 2, 2a
.. Are transport rolls disposed in the continuous heat treatment furnace 1, 3 is a steel strip transported by the transport rolls 2, 2a,.
Reference numerals 4a... Denote blowing nozzles which are directed at the biting portions of the steel strip 3 in the entire width direction.
A low-viscosity nitrogen gas is blown to the portion where the conveying rolls 2, 2 a.
【００１１】なお、このような搬送ロール２、２ａ・・
・に対する吹付けノズル４、4a、4b、4cの配置は、鋼帯
の連続焼鈍炉、連続溶融亜鉛めっき装置の鋼帯前処理炉
等のあらゆる連続熱処理炉内の搬送ロールの全てに有効
に用いることができる。Incidentally, such transport rolls 2, 2a,.
The spray nozzles 4, 4a, 4b, and 4c are effectively used for all the transfer rolls in any continuous heat treatment furnace such as a continuous annealing furnace for a steel strip, a steel strip pretreatment furnace of a continuous galvanizing apparatus, and the like. be able to.
【００１２】[0012]
【実施例】次に、連続焼鋳炉（加熱帯、均熱帯720 ℃、
冷却帯100 ℃）の加熱帯上下に配置されたロール粗度
（Ra)3.5μｍ、ロール径 750mmの搬送ロールと、通板張
力 2.0kg/mm2でこの搬送ロールにより搬送されてくる板
厚0.25mm、板幅850 mmの鋼帯（C:0.03％の低炭素鋼板）
との噛込み部位に吹付けノズルから雰囲気組成が N295
％、残 H2 の低粘性ガスを吹付けつつ鋼帯を熱処理した
結果を実施例１〜４とし、噛込み部位へ低粘性の気体を
吹付けることのない場合を比較例として表１に示す。
この表によれば、各実施例とも鋼帯の蛇行等がほとんど
なく平均通板速度８００m/分の高速搬送ができ生産効率
を高めることができたのに対し、噛込み部位へ低粘性ガ
スを吹付けることのない比較例においては、蛇行が発生
するため搬送速度を平均通板速度５５０ｍ／分に抑えて
蛇行を防止しつつ搬送することとなり、生産性が低下し
たことが判る。次に本発明方法の実施例を比較例ととも
に挙げる。EXAMPLE Next, a continuous sintering furnace (heating zone, soaking zone 720 ° C,
Rolls disposed roughness in the heating zone above and below the cooling 100 ° C. zone) (Ra) 3.5μm, a transport roll of the roll diameter 750 mm, thickness is conveyed by the conveying rolls in strip passing tension 2.0 kg / mm 2 0.25 mm, steel strip 850 mm wide (C: 0.03% low carbon steel sheet)
The composition of the atmosphere is N 2 95
%, The results of heat treatment of the steel strip while blowing a low-viscosity gas of the remaining H 2 are referred to as Examples 1 to 4, and Table 1 shows a comparative example in which the low-viscosity gas is not blown to the biting portion. .
According to this table, in each of the examples, there was almost no meandering of the steel strip, etc., and high-speed conveyance at an average sheet passing speed of 800 m / min was able to be performed, thereby increasing the production efficiency. In the comparative example without spraying, meandering occurs, so that the conveying speed is suppressed to an average passing speed of 550 m / min to convey while preventing the meandering, which indicates that the productivity is reduced. Next, examples of the method of the present invention will be described together with comparative examples.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【発明の効果】本発明は前記説明から明らかなように、
熱処理炉内搬送ロールと金属帯との噛込み部位に2.5 ×
10 -5 Pa・S 以下に低粘性ガスを吹付けることにより、搬
送ロールでの金属帯の蛇行、スリップ等を確実に防止す
ることができ、金属帯の通板速度を低下させることなく
熱処理できるので生産性を著しく向上させることができ
る。しかも、搬送ロールの表面粗度やクラウン等の調整
を必要とする必要もないので、コストを低減することが
できる等の優れた効果が得られる。従って、本発明は搬
送ロールの金属帯蛇行を的確容易に防止できる連続熱処
理炉内の通板金属帯蛇行及びスリップ防止方法として業
界にもたらすところ極めて大きいものがある。As apparent from the above description, the present invention provides:
2.5 × at the site where the transfer roll in the heat treatment furnace and the metal strip are engaged
By spraying a low-viscosity gas at 10 -5 Pa · S or less, meandering and slippage of the metal band on the transport roll can be reliably prevented, and heat treatment can be performed without lowering the passing speed of the metal band. Therefore, productivity can be remarkably improved. Moreover, since it is not necessary to adjust the surface roughness and crown of the transport roll, excellent effects such as a reduction in cost can be obtained. Therefore, the present invention has an extremely large method to be introduced to the industry as a method of preventing a metal strip from meandering and slipping in a continuous heat treatment furnace that can accurately and easily prevent the metal strip from meandering on a transport roll.
【図１】本発明方法の実施例を説明する側面図である。FIG. 1 is a side view illustrating an embodiment of the method of the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 風岡 勇人 愛知県東海市東海町５−３ 新日本製鐵 株式会社名古屋製鐵所内 (56)参考文献 特開 昭64−7259（ＪＰ，Ａ) 特開 昭55−107720（ＪＰ，Ａ) 特公 平６−4894（ＪＰ，Ｂ２) 特公 昭53−9163（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 9/56 101 C21D 1/00 115 F27B 9/00 - 9/40 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hayato Kazeoka 5-3 Tokai-cho, Tokai-shi, Aichi Prefecture Nippon Steel Corporation Nagoya Works (56) References JP-A-64-7259 (JP, A) 55-107720 (JP, A) JP 64894 (JP, B2) JP 53-9163 (JP, B2) (58) Fields studied (Int. Cl. 7 , DB name) C21D 9 / 56 101 C21D 1/00 115 F27B 9/00-9/40
Claims (2)
み部位に2.5 ×10 -5 Pa・S 以下の低粘性ガスを吹付ける
ことを特徴とする連続熱処理炉内の通板金属帯蛇行及び
スリップ防止方法。1. A meandering sheet metal strip in a continuous heat treatment furnace, wherein a low-viscosity gas of 2.5 × 10 -5 Pa · S or less is blown to a portion where the transfer roll and the metal strip in the heat treatment furnace are engaged. And slip prevention method.
化した2.5 ×10-5Pa・S 以下の低粘性ガスを吹付けるこ
とを特徴とする請求項１に記載の連続熱処理炉内の通板
金属帯蛇行及びスリップ防止方法。2. A part of the gas in the furnace is taken out and reduced in viscosity.
The method for preventing meandering and slipping of a continuous metal strip in a continuous heat treatment furnace according to claim 1, wherein a low-viscosity gas of 2.5 × 10 -5 Pa · S or less is blown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06108162A JP3088903B2 (en) | 1994-05-23 | 1994-05-23 | Prevention of meandering and slippage of metal strip in continuous heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06108162A JP3088903B2 (en) | 1994-05-23 | 1994-05-23 | Prevention of meandering and slippage of metal strip in continuous heat treatment furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07316667A JPH07316667A (en) | 1995-12-05 |
| JP3088903B2 true JP3088903B2 (en) | 2000-09-18 |
Family
ID=14477544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06108162A Expired - Fee Related JP3088903B2 (en) | 1994-05-23 | 1994-05-23 | Prevention of meandering and slippage of metal strip in continuous heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3088903B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101516501B1 (en) * | 2013-12-12 | 2015-05-04 | 박경일 | Cover used for a cushion |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4496572B2 (en) * | 1999-10-29 | 2010-07-07 | 住友金属工業株式会社 | Continuous heat treatment method for steel strip |
-
1994
- 1994-05-23 JP JP06108162A patent/JP3088903B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101516501B1 (en) * | 2013-12-12 | 2015-05-04 | 박경일 | Cover used for a cushion |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07316667A (en) | 1995-12-05 |
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