JPS62103366A

JPS62103366A - Cooling method for steel strip

Info

Publication number: JPS62103366A
Application number: JP24435185A
Authority: JP
Inventors: Hiroshi Kagechika; 影近　博; Hiroshi Kibe; 洋木部
Original assignee: NKK Corp; Nippon Kokan Ltd
Current assignee: JFE Engineering Corp
Priority date: 1985-10-31
Filing date: 1985-10-31
Publication date: 1987-05-13

Abstract

PURPOSE:To eliminate the need for pressure difference chamber, and to obtain compact equipment, by cooling a steel strip by radiation heat transfer from the strip to a roll by improving radiation ratio of roll surface. CONSTITUTION:In a vacuum cooling chamber 4, the steel strip 13 is passed to cooling rolls 12 whose surface is subjected to treatment for improving radiation ratio to cool the strip 13. Further, favorably, the strip 13 to be continuously surface treated by vapor deposition, etc., is cooled in vacuum. Black Cr or black Ni galvanizing is favorable to treatment for improving radiation ratio of the roll 12. By such a method, the strip 13 is cooled by radiation heat transfer to the roll 12 therefrom without relying on thermal conduction through gaseous layer existing between the roll 12 and the strip 13 and the need for pressure difference chambers between vapor deposition chambers 2, 6 and the chamber 4 are eliminated, thus obtaining the compact equipment.

Description

【発明の詳細な説明】（産業上の利用分野）この発明は、鋼帯をロールにより冷却する方法、とくに
鋼帯を真空中で連続的に表面処理する場合に、この鋼帯
を真空中でロールにより冷却する方法に関する。[Detailed Description of the Invention] (Industrial Application Field) This invention provides a method for cooling a steel strip using rolls, particularly when the steel strip is subjected to continuous surface treatment in a vacuum. This invention relates to a method of cooling using rolls.

（従来技術及びその問題点）鋼帯を真空中で連続的に表面処理する場合、例えば鋼帯
表面に真空蒸着、イオンブレーティング、ス／？ツタリ
ングあるいはＣＶＤ等を施す場合、表面皮膜の形成に伴
って母材鋼帯の温度上昇が避けられない。この温度上昇
は、蒸着粒子の凝縮や凝固による潜熱、衝突による衝撃
熱、プラズマやるつぼの輻射熱等に起因しており、皮膜
の膜厚が厚くなるに従ってこの傾向が大きくなる。＠帯
の温度が過変に上昇すると、蒸気圧の高い蒸着粒子が再
蒸発したり、皮膜と下地鋼板との間に好ましくない合金
化が生じたり、更には母材鋼帯の機械的特性が劣化する
などのおそれがある。従って細帯を真空中で連続的に表
面処理する場合、とくに鋼帯に厚い皮膜（例えば二層め
っき皮１ｇ　）を形成したり、Ｉｉ！Ａ帝の両面に皮；
−を形成する場合、処理の途中で鋼帯を冷却する必要が
ある。(Prior art and its problems) When surface-treating a steel strip continuously in a vacuum, for example, the surface of the steel strip may be subjected to vacuum deposition, ion blating, sintering, etc. When performing vine ringing, CVD, etc., it is inevitable that the temperature of the base steel strip increases as a surface film is formed. This temperature increase is caused by latent heat due to condensation and solidification of the deposited particles, shock heat due to collision, radiant heat from the plasma and crucible, etc., and this tendency increases as the film thickness increases. If the temperature of the strip rises excessively, the deposited particles with high vapor pressure may reevaporate, unfavorable alloying may occur between the coating and the underlying steel sheet, and the mechanical properties of the base steel strip may deteriorate. There is a risk of deterioration. Therefore, when surface-treating a strip continuously in a vacuum, it is especially important to form a thick film (for example, 1 g of double-layer plating) on the steel strip, or to treat the surface of the strip in a vacuum. Skin on both sides of Emperor A;
-, it is necessary to cool the steel strip during the process.

従来、鋼帯を真空中で連続的に真空蒸着処理して二層め
っき皮膜を形成する場合、例えば第４図に示す装置を用
いる。この装置は、入側差圧室１、蒸着処理室２、差圧
室３、冷却室４、差圧室５、蒸着処理室６及び出側差圧
室７を順に接続して構成され、蒸着処理室２，６を１Ｏ
−３Ｔｏｒｒ以下の圧力、冷却室４を１０〜１０２Ｔｏ
ｒｒの圧力とし、−力差圧室３．５の圧力を１０　　Ｔ
ｏｒｒから１０〜１０　Ｔｏｒｒあるいは１０〜１０　
　Ｔｏｒｒから１０　　Ｔｏｒｒへ段階的に変化させて
いる。セして鎖帯表面を蒸着処理室２内で蒸着処理した
後差圧室３から冷却室４に通し、ここでロール（図示せ
ず）により鋼帯を冷却し、しかる後差圧室５から蒸着処
理室６に導いてここで次の蒸着処理を行なっている。こ
こで冷却室４の雰囲気圧力を１０〜１０Ｔｏｒｒと比較
的高い圧力とするのは、ロールと鋼帯との間に界在する
ガス層を介した熱伝導により鋼帯を冷却するためである
。Conventionally, when forming a two-layer plating film by continuously vacuum-depositing a steel strip in a vacuum, an apparatus shown in FIG. 4, for example, is used. This device is constructed by sequentially connecting an inlet differential pressure chamber 1, a vapor deposition chamber 2, a differential pressure chamber 3, a cooling chamber 4, a differential pressure chamber 5, a vapor deposition chamber 6, and an outlet differential pressure chamber 7. Processing chambers 2 and 6 are 1O
-3Torr or less pressure, cooling chamber 4 10~102To
rr pressure, and the pressure in the differential pressure chamber 3.5 is 10 T.
orr to 10-10 Torr or 10-10
The pressure is changed stepwise from Torr to 10 Torr. After the steel strip is set and subjected to vapor deposition treatment on the surface of the chain strip in the vapor deposition processing chamber 2, the steel strip is passed from the differential pressure chamber 3 to the cooling chamber 4, where it is cooled by rolls (not shown), and then from the differential pressure chamber 5 to the cooling chamber 4. It is led to a vapor deposition processing chamber 6, where the next vapor deposition processing is performed. The reason why the atmospheric pressure in the cooling chamber 4 is set to a relatively high pressure of 10 to 10 Torr is to cool the steel strip by heat conduction through the gas layer existing between the roll and the steel strip.

しかしこの冷却方法では、冷却室４の圧力を高くするた
め、冷却室４と蒸着処理室２，６との間にそれぞれ前記
差圧室３，５を配置しなければならず、処理装置が大型
化してしまう。However, in this cooling method, in order to increase the pressure in the cooling chamber 4, the differential pressure chambers 3 and 5 must be placed between the cooling chamber 4 and the vapor deposition processing chambers 2 and 6, respectively, and the processing equipment becomes large. It turns into

また冷却室４の圧力を蒸着処理室２，６と同じ１０　　
Ｔｏｒｒ以下とすると、冷却室４ではガス層による熱伝
導は期待できず、冷却性能が著しく低下してしまう。In addition, the pressure in the cooling chamber 4 is set to 10
If the temperature is less than Torr, heat conduction through the gas layer cannot be expected in the cooling chamber 4, and the cooling performance will be significantly reduced.

（発明が解決しようとする問題点）この発明の目的とするところは、１０　　Ｔｏｒｒ以下
の雰囲気圧力でも鋼帯をロールを用いて有効に冷却しう
る方法を提供することにある。(Problems to be Solved by the Invention) An object of the present invention is to provide a method for effectively cooling a steel strip using rolls even at an atmospheric pressure of 10 Torr or less.

またこの発明は、差圧室を必要とせず処理装置をコン・
セクトにすることができる冷却方法を提供することにあ
る。In addition, this invention does not require a differential pressure chamber and the processing equipment can be controlled easily.
The purpose of the present invention is to provide a cooling method that can be used in various sections.

（問題点を解決するための手段）この発明は、表面に輻射率を向上する処理を施したロー
ルに、真空中で鋼帯を通して、鋼帯からロールへの輻射
伝熱により鋼帯を冷却する鋼帯の冷却方法である。(Means for Solving the Problems) This invention cools the steel strip by passing the steel strip in vacuum through a roll whose surface has been treated to improve emissivity, and by radiant heat transfer from the steel strip to the roll. This is a method of cooling steel strips.

ロールに施す表面処理としては、輻射率が高く、更に耐
摩耗性を有し、しかも鋼帯に傷を付けないようなロール
表面か得られる処理方法がよく、例えば黒色クロムメッ
キ、黒色ニッケルメッキなどが好適である。めっき処理
前に、ロール表面にサンドブラストをかけて表面に凹凸
を形成するようにしてもよい。また冷媒としては、低温
の水が安価で扱いやすく、望ましいが、輻射伝熱は高温
部と低温部の温度の巳久の差に比例するため、冷媒はよ
り低温の７レオンがスを使用した方が効果的である。As for the surface treatment to be applied to the roll, it is best to use a treatment method that provides a roll surface that has high emissivity, wear resistance, and does not damage the steel strip, such as black chrome plating, black nickel plating, etc. is suitable. Before plating, the roll surface may be sandblasted to form irregularities on the surface. In addition, as a refrigerant, low-temperature water is desirable because it is cheap and easy to handle, but since radiation heat transfer is proportional to the difference in temperature between the high-temperature and low-temperature regions, it is recommended to use a lower-temperature water solution. is more effective.

冷却処理する際の雰囲気圧力は、表面処理する際の雰囲
気圧力と同じ圧力、例えば１０　　Ｔｏｒｒとすること
ができる。この理由は、鋼帯からロールへの輻射伝熱を
利用して鋼帯を冷却するため、ガス層が存在しなくても
冷却が可能なためである。The atmospheric pressure during the cooling treatment can be the same as the atmospheric pressure during the surface treatment, for example, 10 Torr. The reason for this is that the steel strip is cooled using radiation heat transfer from the steel strip to the rolls, so cooling is possible even without the presence of a gas layer.

（発明の作用、効果）この発明によれば、ロール表面の輻射率を向上して鋼帯
からロールへの輻射伝熱により鋼帯を冷却しているので
、冷却室の雰囲気圧力を処理室の雰囲気圧力と同じとす
ることができ、この結果差圧室が不用となり、装置がコ
ンパクトになる。(Operations and Effects of the Invention) According to this invention, the emissivity of the roll surface is improved and the steel strip is cooled by radiation heat transfer from the steel strip to the roll, so the atmospheric pressure in the cooling chamber is reduced to that of the processing chamber. The pressure can be set to be the same as the atmospheric pressure, and as a result, a differential pressure chamber is not required, making the device compact.

（実施例）以下この発明の実施例について説明する。(Example) Examples of the present invention will be described below.

第１図はこの方法に使用する蒸着処理装置のブロック図
である。この装置は、入側差圧室１、蒸着処理室２、冷
却室４、蒸着処理室６及び出側差圧室７を順に接続して
おり、蒸着処理室２、冷却室４及び蒸着処理室６はいず
れもＩＱ　　Ｔｏｒｒ以下の雰囲気圧力である。FIG. 1 is a block diagram of a vapor deposition processing apparatus used in this method. This device has an inlet differential pressure chamber 1, a vapor deposition chamber 2, a cooling chamber 4, a vapor deposition chamber 6, and an outlet differential pressure chamber 7 connected in order. 6 is the atmospheric pressure below IQ Torr.

冷却室４内には、第２図に示すように２個のがイドロー
ル１１．１１と複数個の冷却ロール１２とを組合せて配
置されたロール冷却機構が設けられている。各冷却ロー
ル１２は鋼製ロールの表面に黒色クロムめっきを施して
いる。また別の冷却ロールには、サンドブラスト処理で
ロール表面に凹凸を付けた後黒色クロムめっきを施して
いる。この表面処理を施した各ロールの輻射率を表１の
Ａ　３　、Ａ　４　Ｋそれぞれ示す。Inside the cooling chamber 4, as shown in FIG. 2, a roll cooling mechanism is provided in which two idle rolls 11.11 and a plurality of cooling rolls 12 are arranged in combination. Each cooling roll 12 is a steel roll whose surface is plated with black chrome. Another cooling roll has its surface roughened by sandblasting and then plated with black chrome. The emissivity of each roll subjected to this surface treatment is shown in A 3 and A 4 K in Table 1, respectively.

また比較のためロール表面に処理をしないもの、ロール
表面に光沢クロムめっきを施したものの輻射率を表１の
Ａ　１　、　Ａ　２にそれぞれ併記する。For comparison, the emissivity of the roll surface not treated and the roll surface coated with bright chrome plating are also listed in A 1 and A 2 of Table 1, respectively.

表　　　１次に第２表の如く配置したロールに鋼帯１３を巻き付け
てロールによる冷却効果を評価した。Table 1 Next, the steel strip 13 was wound around rolls arranged as shown in Table 2, and the cooling effect of the rolls was evaluated.

表２に、冷却条件を示す。第３図に鋼帯の速度と鋼帯の
温度降下との関係を示す。Table 2 shows the cooling conditions. Figure 3 shows the relationship between the speed of the steel strip and the temperature drop of the steel strip.

表　　　２第３図から本発明によれば、１０　　Ｔｏｒｒ以下の雰
囲気圧力中で効果的に鋼帯をロールで冷却できることが
わかる。Table 2 From FIG. 3, it can be seen that according to the present invention, the steel strip can be effectively cooled with a roll in an atmospheric pressure of 10 Torr or less.

【図面の簡単な説明】[Brief explanation of drawings]

第１図・は本発明方法で使用する鋼帯の冷却装置の一例
を示すブロック図である。第２図は鋼帯を冷却するため
のロールの配置を示す説明図、第３図はこの発明の実施
例の実験結果を比較例の実験結果とともに示す冷却特性
図、第４図は従来の鋼帯の冷却装置のプロ、り図である
。１・・・入側差圧室、２，６・・・蒸着処理室、３゜５
・・・差圧室、イ・・・冷却室、７・・・出側差圧室、
１１・・・ガイドロール、１２・・・冷却ロール、１３
・・・鋼帯。出鹿人代理人　　弁理士　鈴　江　武　彦第１図第２図第３図（ｍ／ｍｉｎ）FIG. 1 is a block diagram showing an example of a steel strip cooling device used in the method of the present invention. Fig. 2 is an explanatory diagram showing the arrangement of rolls for cooling the steel strip, Fig. 3 is a cooling characteristic diagram showing the experimental results of the embodiment of the present invention together with the experimental results of a comparative example, and Fig. 4 is a diagram showing the experimental results of the conventional steel strip. This is a professional diagram of a belt cooling device. 1... Inlet differential pressure chamber, 2, 6... Vapor deposition processing chamber, 3゜5
...Differential pressure chamber, A...Cooling chamber, 7...Outlet differential pressure chamber,
11... Guide roll, 12... Cooling roll, 13
...Steel belt. Izuka Agent Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 (m/min)

Claims

【特許請求の範囲】[Claims]

（１）表面に輻射率を向上する処理を施したロールに、
真空中で鋼帯を通して、鋼帯からロールへの輻射伝熱に
より鋼帯を冷却する鋼帯の冷却方法。(1) A roll whose surface has been treated to improve emissivity.
A steel strip cooling method in which the steel strip is cooled by radiation heat transfer from the steel strip to the rolls through the steel strip in a vacuum.

（２）真空中で連続的に表面処理する鋼帯を冷却する特
許請求の範囲第１項記載の鋼帯の冷却方法。(2) A method for cooling a steel strip according to claim 1, wherein the steel strip is continuously surface-treated in vacuum.

（３）輻射率を向上する処理は、黒色クロムメッキであ
る特許請求の範囲第１項記載の鋼帯の冷却方法。(3) The method for cooling a steel strip according to claim 1, wherein the treatment for improving emissivity is black chrome plating.

（４）輻射率を向上する処理は黒色ニッケルメッキであ
る特許請求の範囲第１項記載の鋼帯の冷却方法。(4) The method for cooling a steel strip according to claim 1, wherein the treatment for improving emissivity is black nickel plating.