JPH09136145A - Method for working recessed parts on peripheral surface for continuously casting cast strip - Google Patents

Method for working recessed parts on peripheral surface for continuously casting cast strip

Info

Publication number
JPH09136145A
JPH09136145A JP29427495A JP29427495A JPH09136145A JP H09136145 A JPH09136145 A JP H09136145A JP 29427495 A JP29427495 A JP 29427495A JP 29427495 A JP29427495 A JP 29427495A JP H09136145 A JPH09136145 A JP H09136145A
Authority
JP
Japan
Prior art keywords
shot
peripheral
cooling
diameter
average
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.)
Pending
Application number
JP29427495A
Other languages
Japanese (ja)
Inventor
Isao Mizuchi
功 水地
Yoshio Hayashida
義夫 林田
Original Assignee
Nippon Steel Corp
新日本製鐵株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp, 新日本製鐵株式会社 filed Critical Nippon Steel Corp
Priority to JP29427495A priority Critical patent/JPH09136145A/en
Publication of JPH09136145A publication Critical patent/JPH09136145A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To extend the service life of a cooling roll by using shot grains having grain diameter distribution, in which the max. diameter of the shot grains is not larger by a prescribed value or larger than the average diameter. SOLUTION: On the peripheral surfaces of the cooling rolls 2a, 2b in twin roll type continuous casting apparatus for casting a cast strip 6 by supplying molten metal into a molten metal pool part 4 formed with one pair of cooling rolls 2a, 2b, recessed parts are worked with a shot blasting method. At this time, the shot grains having the grain diameter satisfying the max. diameter <=the average diameter +0.3mm. Therein, in order to obtain the recessed part having a prescribed average depth, the higher hardeness of the peripheral surface of the cooling roll is, the larger average diameter of the used shot grains is desired. The relation between the hardness of the cooling rolls 2a, 2b and the average grain diameter of the used shot grains, is decided according to a kind of the shot blast working device and the working condition.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、薄帯鋳片を鋳造す
る双ドラム式連続鋳造装置の冷却ドラムの周面に窪みを
加工する方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a depression on a peripheral surface of a cooling drum of a twin-drum type continuous casting apparatus for casting a strip cast.

【0002】[0002]

【従来の技術】ホットストリップと同等かあるいはそれ
に近い厚さの薄帯鋳片を連続鋳造によって製造する同期
式連続鋳造プロセスとして、たとえば、双ドラム方式の
連続鋳造装置は図1に示すように、軸を水平にし、互い
に接近して平行に設置され、且つ互いに逆方向に回転す
る一対の冷却ドラム2a,2bの両端面にサイド堰8,
8(手前側は図示せず)が圧着されて構成されており、
これら冷却ドラム2a,2bとサイド堰8,8とで形成
された湯溜り部4にタンディッシュ1からノズル3を介
し溶湯を注入することにより、溶湯は冷却ドラム2a,
2bの周面部で凝固シェルを形成し、凝固シェルはキッ
シングポイント5で圧着されて薄帯鋳片6が形成され
る。薄帯鋳片6はピンチロール7によって矢印の方向に
送られ、必要に応じてインライン圧延機9によって圧延
される。ところで薄帯鋳片6の板厚は1〜7mm程度と薄
いため、凝固シェルの形成状態により、その表面性状が
著しく影響を受け、凝固シェル厚の不均一などにより鋳
片表面に割れなどの欠陥が生じることがある。
2. Description of the Related Art As a synchronous continuous casting process for producing a strip slab having a thickness equal to or close to that of a hot strip by continuous casting, for example, a twin-drum type continuous casting apparatus is shown in FIG. Side dams 8 are provided on both end faces of a pair of cooling drums 2a, 2b which are installed parallel to each other with their axes horizontal and close to each other and which rotate in opposite directions.
8 (the front side is not shown) is crimped and configured,
By injecting the molten metal from the tundish 1 through the nozzle 3 into the molten metal pool 4 formed by the cooling drums 2a, 2b and the side dams 8, 8, the molten metal is cooled by the cooling drums 2a,
A solidified shell is formed on the peripheral surface of 2b, and the solidified shell is pressed at a kissing point 5 to form a strip cast piece 6. The strip slab 6 is sent in the direction of the arrow by the pinch roll 7 and is rolled by the in-line rolling mill 9 if necessary. By the way, since the thickness of the thin strip cast piece 6 is as thin as about 1 to 7 mm, the surface condition of the solidified shell is significantly affected by the formation state of the solidified shell, and the unevenness of the solidified shell thickness causes defects such as cracks on the surface of the cast piece. May occur.

【0003】かかる問題点を解決するために、冷却ドラ
ム周面に多数の窪みを設けることが特開昭60−184
449号公報などに開示されている。この窪みによって
冷却ドラムと凝固シェルとの間に断熱層となるガスギャ
ップを形成し、冷却ドラムの抜熱量を小さくして溶湯の
緩慢な冷却を行うとともに、薄帯鋳片表面に窪みによる
凸転写を形成させ、凸転写の周縁部から凝固を開始させ
ることにより、凝固シェル厚を板幅方向で均一にしよう
とするものである。
In order to solve such a problem, it is necessary to provide a large number of depressions on the peripheral surface of the cooling drum.
No. 449, etc. A gas gap, which serves as a heat insulating layer, is formed between the cooling drum and the solidification shell by this depression, and the amount of heat removed from the cooling drum is reduced to allow slow cooling of the molten metal, and at the same time, the convex transfer due to the depression is formed on the surface of the strip slab. Is formed and coagulation is started from the peripheral portion of the convex transfer, so that the coagulated shell thickness is made uniform in the plate width direction.

【0004】更に、薄帯鋳片の表面割れを効率的に防止
するために、前記冷却ドラム周面における窪みの形状や
窪みの大きさまたは窪みの分布などを規定した技術が特
開平1−83340号公報、特開平1−83342号公
報および、特開平3−110044号公報などによって
知られている。
Further, in order to effectively prevent the surface cracking of the thin strip cast, there is a technique which defines the shape of the depressions, the size of the depressions, the distribution of the depressions, etc. on the peripheral surface of the cooling drum. It is known from JP-A No. 1-83342 and JP-A No. 3-110044.

【0005】また、本出願人は双ドラム方式の連続鋳造
装置で連続鋳造された薄帯鋳片を、鋳造に続いてインラ
インで圧延して薄帯板を製造する方法において、前記冷
却ドラム周面における窪みの平均深さを下限値として規
定することにより鋳片の表面割れを防止し、窪みの最大
深さを上限値として規定することにより鋳片のスケール
噛込み疵を防止する発明を特願平7−093910号及
び特願平7−205504号によって出願した。
In addition, the applicant of the present invention provides a method for producing a strip plate by in-line rolling a strip slab continuously cast by a twin-drum type continuous casting apparatus, in which a peripheral surface of the cooling drum is manufactured. Patent application for invention that prevents surface cracking of the slab by defining the average depth of the dents as the lower limit value and prevents scale biting flaws of the slab by defining the maximum depth of the dents as the upper limit value. The application was filed according to Japanese Patent Application No. 7-093910 and Japanese Patent Application No. 7-205504.

【0006】この様に冷却ドラム周面の窪み深さは、平
均深さと最大深さの各値を満足することが必要である。
これらの値は鋳造鋼種等によって異なるものの、例え
ば、ステンレス鋼の場合、平均深さ≧60μm、最大深
さ≦100μmであり、普通鋼の場合、平均深さ≧70
μm、最大深さ≦200μmである。
As described above, the depth of the depression on the peripheral surface of the cooling drum needs to satisfy the average depth and the maximum depth.
Although these values differ depending on the type of cast steel, for example, in the case of stainless steel, the average depth ≧ 60 μm and the maximum depth ≦ 100 μm, and in the case of ordinary steel, the average depth ≧ 70 μm.
μm, maximum depth ≦ 200 μm.

【0007】ところで、冷却ドラム周面に加工した窪み
は、長時間の鋳造に伴い僅かではあるが摩耗によって減
少する。このため、窪みの平均深さが下限値よりも小さ
くなった時点が窪みの寿命となり、冷却ドラム周面には
窪みを再加工する必要がある。したがって、冷却ドラム
の寿命を延ばすためには、窪みの平均深さは前記最大深
さの上限値を超えない範囲でできるだけ大きいことが必
要であり、そのためには窪み深さのばらつきが小さいこ
とが必要である。
By the way, the recesses formed on the peripheral surface of the cooling drum are slightly reduced due to wear during casting for a long time. Therefore, when the average depth of the recesses becomes smaller than the lower limit value, the life of the recesses is reached, and it is necessary to rework the recesses on the peripheral surface of the cooling drum. Therefore, in order to extend the life of the cooling drum, it is necessary that the average depth of the depressions is as large as possible within a range not exceeding the upper limit value of the maximum depth, and for that purpose, the variation in the depression depths may be small. is necessary.

【0008】このような条件を満足する窪みをフォトエ
ッチング法やレーザー加工法によって加工するのは比較
的容易であるが、これらの方法はショットブラスト法に
比較して、コストや加工時間等の点で不利である。一
方、ショットブラスト法の場合、フォトエッチング法や
レーザー加工法に較べ短時間で加工できコストも低いた
め工業的には有利であるが、通常のショット粒を用いて
加工した場合、加工された窪みの深さにばらつきが大き
い。
Although it is relatively easy to process the depressions satisfying such conditions by the photoetching method or the laser processing method, these methods are more costly and more time-consuming than the shot blasting method. Is disadvantageous. On the other hand, the shot blast method is industrially advantageous because it can be processed in a shorter time and costs less than the photoetching method and the laser processing method, but when processed using ordinary shot grains, the processed dent There is a large variation in depth.

【0009】その結果、ドラム寿命延長のために、平均
深さを大きくすると、最大深さが上限値を超えて鋳片に
スケール噛込み疵が発生する場合があり、一方、最大深
さを上限値以下に抑えようとすると平均深さが小さくな
りドラムの寿命が短くなる。場合によっては、平均深さ
及び最大深さの条件を共に満足する窪みを加工できない
場合も生じる。
As a result, if the average depth is increased in order to extend the life of the drum, the maximum depth may exceed the upper limit value and scale bite flaws may occur in the slab, while the maximum depth may be exceeded. Attempting to keep it below this value will reduce the average depth and shorten the life of the drum. In some cases, it may not be possible to form a recess that satisfies both the average depth and maximum depth conditions.

【0010】[0010]

【発明が解決しようとする課題】本発明は、双ドラム式
連続鋳造装置の前記冷却ドラム周面に、窪みの平均深さ
が最大深さの上限値を超えない範囲でできるだけ深い窪
みを精度よく安定して加工することを課題とする。
DISCLOSURE OF THE INVENTION The present invention is to accurately form as deep as possible a dent on the peripheral surface of the cooling drum of a twin-drum type continuous casting apparatus within a range in which the average depth of the dent does not exceed the upper limit of the maximum depth. The task is to work stably.

【0011】[0011]

【課題を解決するための手段】本発明は、前記課題を解
決するために、冷却ドラムの周面にショットブラスト法
によって窪みを加工する際に、最大直径≦平均直径+
0.30mmの範囲を満足するショット粒を用いて冷却ド
ラム周面に窪みを加工することを特徴とする。
According to the present invention, in order to solve the above-mentioned problems, when a recess is formed on the peripheral surface of a cooling drum by a shot blast method, maximum diameter ≤ average diameter +
It is characterized in that a recess is formed on the peripheral surface of the cooling drum by using shot particles satisfying the range of 0.30 mm.

【0012】この時、加工される窪みの直径は0.5mm
〜2.0mm、面積率は30〜70%であり、平均深さ及
び最大深さは鋳造する鋼種がステンレス鋼の場合、平均
深さ≧60μm、最大深さ≦100μmであり、普通鋼
の場合、平均深さ≧70μm、最大深さ≦200μmで
ある。
At this time, the diameter of the recess processed is 0.5 mm.
~ 2.0 mm, area ratio is 30 ~ 70%, average depth and maximum depth are average depth ≧ 60 μm, maximum depth ≦ 100 μm when casting steel type is stainless steel, and ordinary steel , Average depth ≧ 70 μm, maximum depth ≦ 200 μm.

【0013】薄帯鋳片の表面割れ防止のためには、
(1)冷却ドラムと凝固シェルとの間にガスギャップを
形成させ、凝固シェルを緩冷却させること、(2)鋳片
表面に窪みによる凸転写を形成させることによって、凸
転写の周縁部から凝固を開始させ、且つ凝固を鋳片幅方
向で均一にすることが必要である。前記(1)および
(2)の効果を得るためには窪みの平均深さは大きい方
が有利である。
In order to prevent surface cracking of the strip cast,
(1) A gas gap is formed between the cooling drum and the solidification shell to allow the solidification shell to cool slowly, and (2) a convex transfer due to a depression is formed on the surface of the slab to solidify from the peripheral edge of the convex transfer. It is necessary to start the solidification and make the solidification uniform in the width direction of the slab. In order to obtain the effects of (1) and (2), it is advantageous that the average depth of the depression is large.

【0014】一方、鋳造後の薄帯鋳片をインラインで圧
延する場合は圧延後の薄帯鋳片にはスケール噛込み疵が
発生し、この疵は冷延後の薄板製品でも残存する。この
スケール噛込み疵防止のためには、(3)スケール噛込
み疵は凸転写部のうち高い凸転写の部分、すなわち冷却
ドラム周面に加工した窪みのうち深い窪みと対応する部
分から優先的に発生することから、深い窪みをなくす必
要がある。
On the other hand, when the ingot is rolled in-line, a scale bite flaw is generated in the rolled ribbon slab, and the flaw remains even in the cold rolled thin plate product. In order to prevent the scale biting flaw, (3) the scale biting flaw is preferentially applied from a portion of the convex transfer portion having a high convex transfer, that is, a portion corresponding to a deep recess of the recess processed on the cooling drum peripheral surface. It is necessary to eliminate the deep depression because it occurs in the.

【0015】また、鋳造後にインラインで圧延しない場
合はスケール噛込み疵は発生しないが、冷延後において
も凸転写が完全に消えずに痕跡が残存する。この凸転写
痕も高い凸転写部、すなわち冷却ドラム周面に加工した
窪みのうち深い窪みと対応する部分から優先的に発生す
ることから、深い窪みをなくす必要がある。つまり、ス
ケール噛込み疵や凸転写痕を防止するためには、窪みの
最大深さを制限する必要がある。
If rolling is not performed in-line after casting, no scale biting flaws occur, but after cold rolling, the convex transfer does not completely disappear and a trace remains. Since this convex transfer trace is also preferentially generated from a convex transfer portion, that is, a portion corresponding to a deep recess of the recess processed on the peripheral surface of the cooling drum, it is necessary to eliminate the deep recess. That is, it is necessary to limit the maximum depth of the dent in order to prevent scale biting flaws and convex transfer marks.

【0016】また、冷却ドラム周面に加工した窪みは、
長時間の鋳造に伴い、僅かではあるが摩耗によって減少
する。このため、窪みの平均深さは、前記最大深さを超
えない範囲でできる限り大きくする方が、長時間の鋳造
に対して有利である。
Further, the recess formed on the peripheral surface of the cooling drum is
With casting for a long time, it is slightly reduced due to wear. Therefore, it is advantageous for casting for a long time that the average depth of the depressions is as large as possible within the range not exceeding the maximum depth.

【0017】このように冷却ドラム周面に加工する窪み
深さは、最大深さと平均深さの各値を満足することが必
要であるが、ドラム寿命延長のためには、窪みの平均深
さは最大深さの上限値を超えない範囲でできる限り大き
くする必要がある。
As described above, the depth of the recess formed on the peripheral surface of the cooling drum must satisfy the maximum depth and the average depth, but the average depth of the recess is extended to extend the life of the drum. Must be as large as possible without exceeding the upper limit of maximum depth.

【0018】この窪みの加工方法としては、フォトエッ
チング法、レーザー加工法、ショットブラスト法等が知
られているが、工業的には短時間でかつ安価に加工でき
るショットブラスト法が最も有利である。しかし、通常
用いられているショット粒を使用したショットブラスト
法では、窪み深さの精密な制御は困難であり、鋳造鋼種
によっては必要条件を満足する窪みを安定して加工する
ことは困難である。
As a method of processing the depression, a photoetching method, a laser processing method, a shot blast method and the like are known, but the shot blast method is industrially most advantageous because it can be processed in a short time and at a low cost. . However, with the shot blasting method using shot grains that is commonly used, it is difficult to precisely control the depth of the depression, and depending on the type of cast steel, it is difficult to stably process the depression that satisfies the necessary conditions. .

【0019】[0019]

【発明の実施の形態】本発明者は、ショットブラスト法
による冷却ドラム周囲への窪みの加工に関して種々研究
を重ねた結果、ショットブラスト法により最大深さと平
均深さの差の小さい窪みを加工するためには、ショット
粒の粒径分布範囲(最大直径−平均直径)を小さくする
ことが最も効果的であることの知見を得た。
BEST MODE FOR CARRYING OUT THE INVENTION The present inventor has carried out various researches on the processing of a recess around the cooling drum by the shot blast method, and as a result, processes the recess having a small difference between the maximum depth and the average depth by the shot blast method. Therefore, it was found that it is most effective to reduce the particle size distribution range (maximum diameter-average diameter) of shot particles.

【0020】つまり、ショット粒の粒径分布範囲(最大
直径−平均直径)を小さくすれば、窪み深さの分布範囲
(最大深さ−平均深さ)は小さくなり、この場合はショ
ットブラスト装置の種類(エアー式、インペラー式
等)、加工条件、冷却ドラム周面の硬度等は、窪みの平
均深さのみに影響を及ぼし、窪み深さの分布範囲(最大
深さ−平均深さ)には殆ど影響を及ぼさない。
That is, if the particle size distribution range of shot particles (maximum diameter-average diameter) is reduced, the distribution range of depression depth (maximum depth-average depth) is reduced. The type (air type, impeller type, etc.), processing conditions, and hardness of the peripheral surface of the cooling drum affect only the average depth of the depressions, and the distribution range of the depression depths (maximum depth-average depth) Has almost no effect.

【0021】図2は、ショットブラスト法により、冷却
ドラム周面に窪みを加工した場合に用いたショット粒の
最大直径と平均直径の差と窪みの最大深さと平均深さの
差の関係を示す。図2において、ショット粒最大直径−
ショット粒平均直径が0.30mmより大きい範囲ではシ
ョット粒最大直径−ショット粒平均直径の値が小さくな
るにつれて、窪み最大深さ−窪み平均深さの値も小さく
なるが、ショット粒最大直径−ショット粒平均直径が
0.30mm以下の範囲では窪み最大深さ−窪み平均深さ
の値は殆ど変化しない。
FIG. 2 shows the relationship between the difference between the maximum diameter and the average diameter of the shot grains used when the depression was formed on the peripheral surface of the cooling drum by the shot blast method, and the difference between the maximum depth and the average depth of the depression. . In Fig. 2, the maximum diameter of the shot grain
In the range where the shot grain average diameter is larger than 0.30 mm, the value of the shot grain maximum diameter-the shot grain average diameter becomes smaller as the value of the shot grain maximum diameter-shot grain average diameter becomes smaller, but the shot grain maximum diameter-shot In the range where the average grain diameter is 0.30 mm or less, the value of the maximum depth of the recess-the average depth of the recess hardly changes.

【0022】一方、ショット粒の粒径分布範囲を絞り込
むことは、ショット粒製造時、ショット粒の篩分け工程
での歩留りが悪くなることからコスト的に不利になる。
そこでショット粒を最大直径≦平均直径+0.30mmの
範囲にすることによって、最大深さ−平均深さの値が小
さい窪みを僅かなコスト増で加工することが可能とな
る。これによるドラム寿命延長効果の方がショット粒粒
径絞り込みのデメリットよりもはるかにコストメリット
が大きい。
On the other hand, narrowing the particle size distribution range of shot particles is disadvantageous in terms of cost because the yield in the step of screening shot particles during production of shot particles deteriorates.
Therefore, by setting the shot grains within the range of maximum diameter ≦ average diameter + 0.30 mm, it becomes possible to process the depression having a small value of maximum depth-average depth with a slight increase in cost. The effect of extending the life of the drum by this is far more cost-effective than the disadvantage of narrowing the shot grain size.

【0023】したがって、ショットブラスト法により、
冷却ドラム周面に最大深さと平均深さの差の小さい窪み
を効率よく加工するためには、最大直径≦平均直径+
0.30mmを満足するショット粒を使用することが必要
である。ここで所望の平均深さの窪みを得るには、冷却
ドラム周面の硬度が高いほど、使用するショット粒の平
均直径を大きくする必要がある。冷却ドラムの硬度と使
用するショット粒の平均粒径の関係はショットブラスト
加工装置の種類(エアー式、インペラー式等)及び加工
条件等に応じて決定する。
Therefore, according to the shot blast method,
In order to efficiently form a dent with a small difference between the maximum depth and the average depth on the peripheral surface of the cooling drum, maximum diameter ≤ average diameter +
It is necessary to use shot grains satisfying 0.30 mm. Here, in order to obtain the depressions having the desired average depth, it is necessary to increase the average diameter of the shot particles used as the hardness of the peripheral surface of the cooling drum increases. The relationship between the hardness of the cooling drum and the average particle size of shot particles to be used is determined according to the type of shot blasting apparatus (air type, impeller type, etc.) and processing conditions.

【0024】[0024]

【実施例】図1に示す双ドラム式連続鋳造装置の冷却ド
ラム周面にショットブラスト法によって窪みを加工し、
板厚3.5mmのSUS304ステンレス鋼薄帯鋳片を鋳
造した。この薄帯鋳片を、鋳造に引続いてインラインで
圧延を実施し、圧延後板厚2.7mmの薄帯板を製造し、
次に冷間圧延して板厚0.5mmの薄板製品を製造した。
EXAMPLE A recess was formed on the peripheral surface of a cooling drum of the twin-drum type continuous casting apparatus shown in FIG.
A SUS304 stainless steel thin strip slab having a plate thickness of 3.5 mm was cast. This thin strip slab is subjected to in-line rolling subsequent to casting to produce a thin strip plate having a plate thickness of 2.7 mm after rolling,
Next, cold rolling was performed to manufacture a thin plate product having a plate thickness of 0.5 mm.

【0025】上記鋳片を製造する際、幅800mm、直径
1200mmの冷却ドラムの周面には表1の条件で窪みを
加工した。なお、本実施例では窪みの加工にはエアー式
のショットブラスト加工装置を用い、鋳造時の雰囲気は
2 を使用した。
When manufacturing the above-mentioned cast piece, a recess was formed under the conditions shown in Table 1 on the peripheral surface of a cooling drum having a width of 800 mm and a diameter of 1200 mm. In the present example, an air type shot blasting machine was used to process the depression, and N 2 was used as the atmosphere during casting.

【0026】なお、図3、図4に代表的なショット粒の
粒径分布を、また、図5、図6に代表的な冷却ドラム周
面の窪み深さ分布を示す。図3、図5は表1中のNo.
1(比較例)、図4、図6は表1中のNo.3(本発明
例)の例である。冷却ドラム周面の窪み加工結果及び薄
板製品の表面品質は下記のとおりであった。
3 and 4 show typical grain size distributions of shot grains, and FIGS. 5 and 6 show representative pit depth distributions on the peripheral surface of the cooling drum. 3 and 5 show No. 1 in Table 1.
1 (comparative example), FIG. 4 and FIG. 3 (Example of the present invention). The results of denting the surface of the cooling drum and the surface quality of the thin plate product were as follows.

【表1】 [Table 1]

【0027】No.1,5の場合:ショット粒の粒径分
布範囲(最大直径−平均直径)が0.30mmを超えてい
るので窪み深さの分布範囲が大きくなり、窪みの平均深
さを満足する窪みを設けると、窪みの最大深さが100
μmを超えた。その結果、この冷却ドラムは使用しなか
った。
No. In the case of 1, 5: Since the particle size distribution range of shot particles (maximum diameter-average diameter) exceeds 0.30 mm, the distribution range of pit depth becomes large, and pits satisfying the average depth of pits are provided. And the maximum depth of the depression is 100
exceeds μm. As a result, this cooling drum was not used.

【0028】No.2,6の場合:ショット粒の粒径分
布範囲(最大直径−平均直径)が0.30mmを超えてい
るので窪み深さの分布範囲が大きくなり、窪みの最大深
さの上限値を満足する窪みを設けると、窪みの平均深さ
が下限値の60μmに近くなった。その結果、鋳造初期
は薄帯鋳片には割れは発生しないが、長時間の鋳造によ
る窪みの摩耗により、やがて薄帯鋳片には割れが発生
し、ドラムの寿命が短かい結果になった。
No. In the case of Nos. 2 and 6, since the particle size distribution range (maximum diameter-average diameter) of shot particles exceeds 0.30 mm, the distribution range of the pit depth becomes large and the upper limit value of the pit maximum depth is satisfied. When the depressions were provided, the average depth of the depressions became close to the lower limit value of 60 μm. As a result, cracks did not occur in the strip slabs at the beginning of casting, but due to wear of the dents caused by casting for a long time, the strip slabs eventually cracked, resulting in a shorter drum life. .

【0029】No.3,4,7,8の場合:ショット粒
の粒径分布範囲(最大直径−平均直径)が0.30mm以
下であるため、窪みは平均深さ、最大深さ共に所定値を
満足している。その結果、薄帯鋳片には割れ、スケール
噛込み疵共に発生せず、さらに窪みの平均深さとその下
限値との差が大きいため、ドラム寿命も延長した。
No. In the case of 3, 4, 7 and 8, since the particle size distribution range (maximum diameter-average diameter) of shot particles is 0.30 mm or less, the average depth and the maximum depth of the dents both satisfy the predetermined values. . As a result, neither the crack nor the scale biting flaw occurred in the thin strip cast, and the difference between the average depth of the depression and the lower limit thereof was large, so that the drum life was extended.

【0030】[0030]

【発明の効果】本発明によれば、双ドラム式連続鋳造装
置の冷却ドラム周面にショットブラスト法によって窪み
を加工する場合に、窪みの平均深さが最大深さの上限値
を超えない範囲でできるだけ大きい窪みを精度よく安定
して加工することができる。これにより、冷却ドラム周
面への窪みの加工をショットブラスト法により行うこと
で、加工コスト及び加工時間を、例えばフォトエッチン
グ法に比べ、約1/100以下に低減することができ
る。また、窪みの平均深さと最大深さの差を小さくする
ことができるので、従来のショット粒を使用した場合に
比べ、ショット粒のコストが20%程度のアップで、冷
却ドラムの寿命を数倍以上に延長させることができる。
このように本発明は、寿命の長い窪みを工業的に安価で
安定して加工可能としたものであるから、工業的効果は
極めて大きい。
EFFECTS OF THE INVENTION According to the present invention, when the recess is machined on the peripheral surface of the cooling drum of the twin-drum type continuous casting apparatus by the shot blast method, the average depth of the recess does not exceed the upper limit of the maximum depth. Thus, it is possible to accurately and stably process as large a depression as possible. As a result, the processing cost and the processing time can be reduced to about 1/100 or less as compared with, for example, the photoetching method by processing the depression on the peripheral surface of the cooling drum by the shot blast method. Further, since the difference between the average depth and the maximum depth of the depressions can be made small, the cost of shot grains is increased by about 20% and the life of the cooling drum is several times that of the conventional shot grains. It can be extended above.
As described above, according to the present invention, a recess having a long life can be manufactured industrially at low cost and stably, so that the industrial effect is extremely large.

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

【図1】本発明を実施するための双ドラム式連続鋳造装
置を示す一部断面側面図である。
FIG. 1 is a partially sectional side view showing a twin-drum continuous casting apparatus for carrying out the present invention.

【図2】冷却ドラム周面に窪みを加工する際に使用した
ショット粒の最大直径と平均直径の差と冷却ドラム周面
の窪みの最大深さと平均深さの差の関係を示す図であ
る。
FIG. 2 is a diagram showing the relationship between the difference between the maximum diameter and the average diameter of shot grains used when processing the depression on the peripheral surface of the cooling drum, and the difference between the maximum depth and the average depth of the depression on the peripheral surface of the cooling drum. .

【図3】冷却ドラム周面に窪みを加工する際に使用した
ショット粒の粒径分布の比較例の一例(表1中のNo.
1)を示す図である。
FIG. 3 is an example of a comparative example of the particle size distribution of shot particles used when processing a dent on the peripheral surface of the cooling drum (No.
It is a figure which shows 1).

【図4】冷却ドラム周面に窪みを加工する際に使用した
ショット粒の粒径分布の本発明の一例(表1中のNo.
3)を示す図である。
FIG. 4 is an example of the present invention of the particle size distribution of shot particles used when processing a dent on the peripheral surface of a cooling drum (No.
It is a figure which shows 3).

【図5】冷却ドラム周面に加工した窪み深さ分布の比較
例の一例(表1中のNo.1)を示す図である。
FIG. 5 is a diagram showing an example (No. 1 in Table 1) of a comparative example of the depth distribution of depressions formed on the peripheral surface of the cooling drum.

【図6】冷却ドラム周面に加工した窪み深さの分布の本
発明の一例(表1中のNo.3)を示す図である。
FIG. 6 is a diagram showing an example of the present invention (No. 3 in Table 1) of the distribution of the depth of depressions formed on the peripheral surface of the cooling drum.

【符号の説明】[Explanation of symbols]

1…タンディッシュ 2a,2b…冷却ドラム 3…ノズル 4…湯溜り部 5…キッシングポイント 6…薄帯鋳片 7…ピンチロール 8,8…サイド堰(手前側は図示せず) 9…インライン圧延機 DESCRIPTION OF SYMBOLS 1 ... Tundish 2a, 2b ... Cooling drum 3 ... Nozzle 4 ... Hot water pool 5 ... Kissing point 6 ... Thin strip 7 ... Pinch roll 8, 8 ... Side weir (front side not shown) 9 ... In-line rolling Machine

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 一対の冷却ドラムによって形成された湯
溜り部に溶湯を供給して薄帯鋳片に連続鋳造する装置の
前記冷却ドラムの周面にショットブラスト法によって窪
みを加工する際に、最大直径≦平均直径+0.30mmを
満足する粒径分布をもつショット粒を用いることを特徴
とする薄帯鋳片連続鋳造用冷却ドラム周面の窪み加工方
法。
1. When processing a recess by a shot blast method on the peripheral surface of the cooling drum of an apparatus for continuously casting a strip cast by supplying molten metal to a molten metal pool portion formed by a pair of cooling drums, A method for forming a depression on the circumferential surface of a cooling drum for continuous casting of thin strip casting, using shot particles having a particle size distribution satisfying maximum diameter ≤ average diameter + 0.30 mm.
JP29427495A 1995-11-13 1995-11-13 Method for working recessed parts on peripheral surface for continuously casting cast strip Pending JPH09136145A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29427495A JPH09136145A (en) 1995-11-13 1995-11-13 Method for working recessed parts on peripheral surface for continuously casting cast strip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29427495A JPH09136145A (en) 1995-11-13 1995-11-13 Method for working recessed parts on peripheral surface for continuously casting cast strip

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2000342271A Division JP2001179630A (en) 2000-11-09 2000-11-09 Method of depressing peripheral face of cooling drum for continuously casting thin band cast piece

Publications (1)

Publication Number Publication Date
JPH09136145A true JPH09136145A (en) 1997-05-27

Family

ID=17805591

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29427495A Pending JPH09136145A (en) 1995-11-13 1995-11-13 Method for working recessed parts on peripheral surface for continuously casting cast strip

Country Status (1)

Country Link
JP (1) JPH09136145A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001085369A1 (en) * 2000-05-12 2001-11-15 Nippon Steel Corporation Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor
KR20020015903A (en) * 2000-08-23 2002-03-02 이구택 Method for Manufacturing Sound Strip in Twin Roll Strip Casting Process
KR100490995B1 (en) * 2000-12-22 2005-05-24 주식회사 포스코 Method For Cleaning The Surface Of Casting Roll In a Continuous Strip Caster
US7328737B2 (en) 2002-10-15 2008-02-12 Voest-Alpine Industrieanlagenbau Gmbh & Co. Installation for continuously producing a thin steel strip

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001085369A1 (en) * 2000-05-12 2001-11-15 Nippon Steel Corporation Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor
US7159641B2 (en) 2000-05-12 2007-01-09 Nippon Steel Corporation Cooling drum for thin slab continuous casting, processing method and apparatus thereof, and thin slab and continuous casting method thereof
EP1281458A1 (en) * 2000-05-12 2003-02-05 Nippon Steel Corporation Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor
EP1281458A4 (en) * 2000-05-12 2004-06-09 Nippon Steel Corp Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor
US6896033B2 (en) 2000-05-12 2005-05-24 Nippon Steel Corporation Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor
EP1582279A1 (en) * 2000-05-12 2005-10-05 Nippon Steel Corporation A continuous cast thin slab
KR20020015903A (en) * 2000-08-23 2002-03-02 이구택 Method for Manufacturing Sound Strip in Twin Roll Strip Casting Process
KR100490995B1 (en) * 2000-12-22 2005-05-24 주식회사 포스코 Method For Cleaning The Surface Of Casting Roll In a Continuous Strip Caster
US7328737B2 (en) 2002-10-15 2008-02-12 Voest-Alpine Industrieanlagenbau Gmbh & Co. Installation for continuously producing a thin steel strip

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