JPH0215615B2

JPH0215615B2 -

Info

Publication number: JPH0215615B2
Application number: JP29658186A
Authority: JP
Inventors: Nobuo Noguchi; Tsuyoshi Masuda; Hirohiko Sato
Original assignee: Nippon Mining Co Ltd
Current assignee: Eneos Corp
Priority date: 1986-12-15
Filing date: 1986-12-15
Publication date: 1990-04-12
Also published as: JPS63149326A

Description

[Detailed description of the invention]

［産業上の利用分野］この発明は縦型BA炉（光輝焼鈍炉）、特にス
テンレスのBA鋼帯、高ニツケル合金鋼帯の熱処
理を行なうのに適した、鋼帯の幅湾曲を防止でき
る縦型BA炉に関する。［従来の技術］ステンレスBA鋼帯、高ニツケル合金鋼帯を縦
型BA炉で熱処理、例えば、溶体化処理をする場
合には、第２−Ａ図および第２−Ｂ図に示すよう
な幅方向の湾曲、すなわち、幅湾曲を発生し易
い。第２−Ａ図および第２−Ｂ図とも鋼板の搬送方
向に対し直角の方向の断面図であつて、第２−Ａ
図は湾曲が１箇所の場合、第２−Ｂ図は湾曲が幅
Ｗ方向に、２箇所ある場合である。ところで、特定の用途、例えば電子材料の用途
に用いられる高ニツケル合金は、平坦度の規格が
極めて厳しく、BA処理後に調質圧延、レベラー
等の平坦度矯正工程が必要になる。更に幅湾曲が
著しい場合には炉内を走行あるいは移行中に、炉
内の部材に接触し、擦り傷を生じ、製品の表面品
質が著しく低下する。上記幅湾曲の発生原因として下記の事項が考え
られている。 (1) 冷却時に生じた幅方向の温度差による熱応
力。 (2) 炉内で加わる高張力が幅方向に不均一である
ために発生する変形。これに対して横型BA炉を用いた場合はこの種
の形状不良は少ない。その理由は横型BA炉では
材料の自重によるカテナリー量を小さくするため
設置した炉内ロールによつて変形を防止している
ためである。しかし、炉内ロールを設けた場合には下記のよ
うな障害が発生し易い。 (1) 加熱炉内にロールを設けた場合には、高温
（炉温900〜1150℃）でロールと接触するために
ロール表面の摩耗による擦り傷や回転部不良に
よる擦り傷が生じて、製品の品質及び美観を著
しく損う。 (2) 加熱炉内にロールを設ける場合には、高温度
におけるマツフルの熱膨脹に追従できるような
ロール支持部の機構が複雑で設備費が甚大にな
る。 (3) 加熱炉出口では、ロールとの接触による材料
の急激な温度変化のために、オレ、シワを生
じ、特に薄物では致命的な欠陥となる。したがつて、加熱炉内にロールを設けない縦型
BA炉において前記欠陥を防止するため、下記の
提案がなされていた。 (1) 冷却帯の幅方向における冷却能力を均一に維
持できるような精密な制御を行なう。 (2) 炉内では低張力搬送をする。［発明が解決しようとする問題点］従来の縦型BA炉の上記提案によつても精密な
制御を行なうための設備費の増大、低張力搬送に
伴う蛇行、ロールスリツプ等の問題が解決でき
ず、幅湾曲現象は解消できなかつた。［問題点を解決するための手段］上記問題を解決するためのこの発明の構成は、
特許請求の範囲に記載のとおりの縦型BA炉であ
る。すなわち、この発明は、縦型BA炉の上記問題
点が縦型BA炉の炉頂ロールと炉下固定部、（例
えばフエルトシールまたはシールロール）との間
に材料の変形を防止できるような拘束力が作用し
ないためであることを見出し、更に、炉内の加熱
された材料がロール接触してもオレ、シワ等の形
状不良を生じない炉内ロール設置条件を見出した
ことに基づくものである。図面を参照して具体的に説明すると、第１図に
示すように加熱帯と冷却帯が炉外ロール４によつ
て縦方向に設けられている縦型BA炉の中に熱処
理される鋼帯１が矢印方向に走行して熱処理さ
れ、炉外ロール４によつて下行し次の工程に送ら
れる。冷却帯中で材料温度が200〜700℃になる箇
所には第３図に示すように３本以上の炉内ロール
３がある。このロールが２本以下では曲がりくね
つた移動経路がとれず曲率の確保が不可能であ
る。この炉内ロール３の径ＤはＤ≧1.4Et／σに
なるように選ばれる。ただし、ｔ：通板板厚（mm）Ｅ：ロール接触時の材料の弾性率（Kg／mm²） σ：ロール接触時の材料の耐力（Kg／mm²）である。鋼板１に作用する張力は0.1〜1.5Kg／mm²になる
ようにし、同時に炉内ロールの間隔Ｓとロールラ
ツプ量Ｌの値は、炉内ロール３によつて湾曲する
鋼板の曲率半径が1000〜15000mmになるように設
けられている。上記炉内ロールの設置場所の温度が700℃より
高いと材料の強度が小さいので変形を生じ易く、
装置の保守も困難である。張力が1.5Kg／mm²を越えると、炉内で材料の座
屈によるオレ、シワを生じたり、炉内ロールの摩
耗が大きく、更に、表面欠陥（擦り傷、打痕等）
も生じ易くなる。反対に、張力が0.1Kg／mm²未満
になると形状補正の効果がなく、撓み、歪みを生
じ易く、方向安定性も悪化する。炉内ロール３の径Ｄは小さすぎると曲げによつ
て材料の変形を生じ易く、径Ｄが大きすぎると適
当な曲率半径を得るためのロール設置間隔Ｓおよ
びロールラツプ量Ｌが炉内空間に入らないものと
なる。結局、実験的に特許請求の範囲に記載の関係式
が導き出されたものである。以下、実施例と比較例を表にしてこの発明を具
体的に説明する。ただし、通板材料はSUS304板厚0.25mm、板巾
650mm、張力0.15Kg／mm²であつた。 [Industrial Application Field] This invention is a vertical BA furnace (bright annealing furnace), which is particularly suitable for heat treating stainless steel BA steel strips and high nickel alloy steel strips, and which can prevent width curvature of steel strips. Regarding type BA furnace. [Prior art] When a stainless BA steel strip or a high nickel alloy steel strip is heat treated in a vertical BA furnace, for example, solution treatment is performed, the width as shown in Figures 2-A and 2-B is applied. It is easy to cause curvature in the direction, that is, curvature in width. Both Fig. 2-A and Fig. 2-B are cross-sectional views taken in a direction perpendicular to the conveying direction of the steel plate.
The figure shows the case where the curve is at one place, and the figure 2-B shows the case where there is the curve at two places in the width W direction. By the way, high nickel alloys used for specific applications, for example, electronic materials, have extremely strict standards for flatness, and require a flatness correction process such as skin pass rolling and a leveler after BA treatment. Furthermore, if the width is significantly curved, the product will come into contact with members in the furnace while traveling or moving in the furnace, causing scratches and significantly degrading the surface quality of the product. The following factors are considered to be the cause of the above width curvature. (1) Thermal stress due to the temperature difference in the width direction that occurs during cooling. (2) Deformation that occurs because the high tension applied in the furnace is uneven in the width direction. On the other hand, when a horizontal BA furnace is used, this type of shape defect is rare. The reason for this is that in the horizontal BA furnace, deformation is prevented by the rolls installed in the furnace to reduce the amount of catenary caused by the weight of the material. However, when a furnace roll is provided, the following problems are likely to occur. (1) When rolls are installed in a heating furnace, contact with the rolls at high temperatures (furnace temperature of 900 to 1150°C) may cause scratches due to abrasion of the roll surface or scratches due to defects in the rotating parts, which may affect the quality of the product. and seriously impairs the aesthetic appearance. (2) When installing rolls in the heating furnace, the mechanism of the roll support part that can follow the thermal expansion of Matsufuru at high temperatures is complicated and the equipment cost is enormous. (3) At the exit of the heating furnace, due to the rapid temperature change of the material due to contact with the rolls, creases and wrinkles occur, which is a fatal defect especially in thin materials. Therefore, the vertical type heating furnace does not have rolls inside the heating furnace.
In order to prevent the above defects in BA furnaces, the following proposals have been made. (1) Perform precise control to maintain uniform cooling capacity across the width of the cooling zone. (2) Use low tension transport inside the furnace. [Problems to be solved by the invention] Even with the above-mentioned proposal for the conventional vertical BA furnace, problems such as increased equipment costs for precise control, meandering caused by low-tension conveyance, and roll slips cannot be solved. However, the width curvature phenomenon could not be resolved. [Means for Solving the Problems] The structure of the present invention for solving the above problems is as follows:
This is a vertical BA furnace as described in the claims. That is, this invention solves the above-mentioned problem of the vertical BA furnace by providing a restraint that can prevent material deformation between the top roll and the bottom fixed part (for example, felt seal or seal roll) of the vertical BA furnace. This is based on the discovery that this is due to no force acting on the rolls, and also the discovery of conditions for installing rolls in the furnace that do not cause defects in shape such as creases and wrinkles even when heated materials in the furnace come into contact with the rolls. . To explain specifically with reference to the drawings, as shown in Fig. 1, a steel strip is heat-treated in a vertical BA furnace in which a heating zone and a cooling zone are vertically provided by outer furnace rolls 4. 1 travels in the direction of the arrow to undergo heat treatment, and then descends by the outer furnace roll 4 and is sent to the next process. As shown in FIG. 3, three or more furnace rolls 3 are located in the cooling zone where the material temperature reaches 200 to 700°C. If the number of rolls is less than two, a winding movement path cannot be taken, and it is impossible to secure the curvature. The diameter D of this furnace roll 3 is selected so that D≧1.4Et/σ. However, t: Thickness of the plate (mm) E: Elastic modulus of the material when in contact with the roll (Kg/mm ² ) σ: Yield strength of the material when in contact with the roll (Kg/mm ² ). The tension acting on the steel plate 1 is set to 0.1 to 1.5 Kg/ ^mm2 , and at the same time, the values of the interval S between the furnace rolls and the amount of roll wrap L are such that the radius of curvature of the steel plate curved by the furnace rolls 3 is 1000 to 1000. It is set to be 15000mm. If the temperature at the location where the furnace roll is installed is higher than 700℃, the strength of the material will be low and deformation will easily occur.
Maintenance of the equipment is also difficult. If the tension exceeds 1.5Kg/ ^mm2 , the material may buckle in the furnace, causing creases and wrinkles, and the rolls in the furnace will be heavily worn, as well as surface defects (scratches, dents, etc.).
It also becomes more likely to occur. On the other hand, if the tension is less than 0.1 Kg/mm ² , there will be no shape correction effect, easily causing deflection and distortion, and directional stability will deteriorate. If the diameter D of the furnace rolls 3 is too small, the material is likely to deform due to bending, and if the diameter D is too large, the roll installation interval S and roll wrap amount L to obtain an appropriate radius of curvature will not fit into the furnace space. It becomes something that does not exist. After all, the relational expression described in the claims was derived experimentally. Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. However, the threading material is SUS304 with a thickness of 0.25 mm and a width of
It was 650mm and the tension was 0.15Kg/ ^mm2 .

【表】［発明の効果］以上説明したように、この発明によれば金属帯
を熱処理するに際し、比較的簡単な装置によつて
欠陥のない金属帯を得ることができる。[Table] [Effects of the Invention] As explained above, according to the present invention, a defect-free metal strip can be obtained using a relatively simple device when heat treating a metal strip.

[Brief explanation of drawings]

第１図は縦型BA炉の概略を示す説明図、第２
−Ａ図および第２−Ｂ図は幅湾曲の説明図、第３
図はロール設置間隔とロールラツプ量の説明図で
ある。１……鋼帯、２……水平定盤、３……炉内ロー
ル、４……炉外ロール、Ｃ……幅湾曲量、Ｌ……
ロールラツプ量、Ｓ……ロール設置間隔、Ｗ……
板幅。 Figure 1 is an explanatory diagram showing the outline of a vertical BA furnace, Figure 2
-A figure and 2-B figure are explanatory diagrams of width curvature, 3rd figure
The figure is an explanatory diagram of the roll installation interval and roll wrap amount. 1...Steel strip, 2...Horizontal surface plate, 3...Roll in the furnace, 4...Roll outside the furnace, C...Amount of width curvature, L...
Roll wrap amount, S...Roll installation interval, W...
Board width.

Claims

[Claims] 1. A vertical BA furnace having a heating zone and a cooling zone, characterized in that the cooling zone has a plurality of rolls meeting the following conditions. (1) It is installed in a cooling zone where the material temperature is 200 to 700℃. (2) The number of rolls is 3 or more. (3) The furnace roll diameter (D) is a value that satisfies the following formula. D≧1.4Et/σ Where, t: Thickness of the plate through which it passes (mm) E: Elastic modulus of material when in contact with rolls (Kg/mm ² ) σ: Proof strength of material when in contact with rolls (Kg/mm ² ) (4 ) The tension range is 0.1-1.5Kg/ ^mm2 . (5) The distance between rolls in the furnace and the amount of roll wrap are such that the radius of curvature caused by the rolls is 1000 to 15000 mm.
It is set up to be.