JPH04238654A - Method for forming dimples in cooling drum for casting thin cast strip and apparatus for machining dimples - Google Patents
Method for forming dimples in cooling drum for casting thin cast strip and apparatus for machining dimplesInfo
- Publication number
- JPH04238654A JPH04238654A JP3012687A JP1268791A JPH04238654A JP H04238654 A JPH04238654 A JP H04238654A JP 3012687 A JP3012687 A JP 3012687A JP 1268791 A JP1268791 A JP 1268791A JP H04238654 A JPH04238654 A JP H04238654A
- Authority
- JP
- Japan
- Prior art keywords
- cooling drum
- dimples
- drum
- casting thin
- laser
- 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.)
- Granted
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 46
- 238000005266 casting Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 26
- 238000003754 machining Methods 0.000 title abstract description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 238000005452 bending Methods 0.000 claims abstract description 5
- 230000010355 oscillation Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 238000009749 continuous casting Methods 0.000 description 5
- 230000037303 wrinkles Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000005499 meniscus Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000005068 transpiration Effects 0.000 description 1
Landscapes
- Laser Beam Processing (AREA)
- Continuous Casting (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、ツインドラム方式，単
ドラム方式，ドラム−ベルト方式等によって薄肉鋳片を
連続鋳造するときに使用される冷却ドラム、およびこの
ドラムにディンプルを規則的および不規則に形成する方
法およびその装置に関する。[Industrial Application Field] The present invention relates to a cooling drum used when continuously casting thin slabs by a twin drum method, a single drum method, a drum-belt method, etc., and a cooling drum in which dimples are formed regularly and irregularly. This invention relates to a method and apparatus for forming rules.
【０００２】0002
【従来の技術】連続鋳造の分野では、コストの切り下げ
、新材質の創出等を目的として、最終形状に近い薄肉鋳
片を溶融金属から直接的に製造する技術の開発が強く望
まれている。この要求に応えるべく、内部冷却水冷機構
を備えた一対の冷却ドラムを使用するツインドラム方式
、一本の冷却ドラムを使用する単ドラム方式、冷却ドラ
ムとベルトとの間に湯だまり部を形成するドラム−ベル
ト方式等の各種方法がこれ迄提案され、その一部は工業
生産のレベル迄達している。BACKGROUND OF THE INVENTION In the field of continuous casting, there is a strong desire to develop a technology for directly producing thin slabs of nearly final shape from molten metal for the purpose of reducing costs and creating new materials. In order to meet this demand, we have developed a twin drum system that uses a pair of cooling drums with an internal cooling water cooling mechanism, a single drum system that uses one cooling drum, and a molten water pool that is formed between the cooling drum and the belt. Various methods such as the drum-belt method have been proposed, and some of them have reached the level of industrial production.
【０００３】これらの連続鋳造においては、薄肉鋳片の
表面性状を安定して高水準に維持することが重要である
。すなわちこれらの連続鋳造方法は、旧来の連続鋳造設
備によって製造されるスラブの場合と異なり、後続する
工程で圧延される度合を小さくすることができる薄肉鋳
片を得ることを意図して開発されたものである。[0003] In these continuous castings, it is important to stably maintain the surface quality of the thin slab at a high level. In other words, these continuous casting methods were developed with the intention of obtaining thin slabs that can be rolled to a lesser extent in subsequent processes, unlike the slabs manufactured by conventional continuous casting equipment. It is something.
【０００４】そのため、薄肉鋳片に肉厚変動，表面割れ
等があると、これが製品表面の欠陥となって残り、商品
価値を著しく損なう危険が大きい。そこで、良好な表面
品質を持つ薄肉鋳片を安定して製造する為、種々の方法
が検討され提案されている。[0004] Therefore, if a thin slab has thickness fluctuations, surface cracks, etc., these will remain as defects on the surface of the product, and there is a great danger that the product value will be significantly impaired. Therefore, various methods have been studied and proposed in order to stably produce thin slabs with good surface quality.
【０００５】たとえば特開昭６０−１８４４４９号公報
では、冷却ドラムとして働くエアギャップを形成するよ
うに、冷却ドラムの周面に凹凸を設けることが提案され
ている。このエアギャップによって、冷却ドラムの抜熱
能力が小さくなり、溶融金属の緩慢な冷却が行われる。
その結果、凝固シェルの厚みが板幅方向で均一化され、
形状特性の優れた薄肉鋳片が製造可能となる。[0005] For example, Japanese Patent Laid-Open No. 184449/1983 proposes providing unevenness on the circumferential surface of a cooling drum so as to form an air gap that functions as a cooling drum. This air gap reduces the ability of the cooling drum to remove heat, resulting in slow cooling of the molten metal. As a result, the thickness of the solidified shell is made uniform in the width direction of the plate,
It becomes possible to manufacture thin slabs with excellent shape characteristics.
【０００６】[0006]
【発明が解決しようとする課題】ところが、周面に凹凸
やディンプルを形成した冷却ドラムを使用して薄肉鋳片
の製造を行うと、得られた鋳片の表面に横皺が発生しや
すい。この原因を図を参照しながら説明する。However, when thin slabs are produced using a cooling drum having irregularities or dimples formed on the circumferential surface, horizontal wrinkles tend to occur on the surface of the resulting slabs. The cause of this will be explained with reference to the diagram.
【０００７】図３は、ツインドラム方式の連続鋳造機に
おける一方の冷却ドラムのメニスカス周辺部を示したも
のであるが、単ドラム方式、ドラム−ベルト方式にあっ
ても同様な問題が生じる。FIG. 3 shows the area around the meniscus of one of the cooling drums in a twin-drum continuous casting machine, but similar problems occur in single-drum and drum-belt systems as well.
【０００８】冷却ドラム１の周面に形成した凹凸，ディ
ンプル２等によって、湯だまり部３に注入された溶融金
属４に振動が付与され、表面波５が発生する。溶融金属
４は、矢印Ｄ方向に冷却ドラム１が回転するに伴って、
冷却ドラム１の周面で冷却されて凝固シェルとなり、ド
ラムギャップに送られる。The irregularities, dimples 2, etc. formed on the circumferential surface of the cooling drum 1 impart vibrations to the molten metal 4 poured into the tundish pool 3, generating surface waves 5. As the cooling drum 1 rotates in the direction of arrow D, the molten metal 4
It is cooled on the circumferential surface of the cooling drum 1, becomes a solidified shell, and is sent to the drum gap.
【０００９】このとき湯面に表面波５が発生していると
、溶融金属４と冷却ドラム１周面との接触状態が悪化し
、界面に不規則な隙間が生じ易くなる。この隙間によっ
て冷却ドラム１に対する伝熱量が低下し、凝固シェルの
成長や冷却速度が鋳片の長手方向に不規則に変化する。At this time, if surface waves 5 are generated on the molten metal surface, the contact condition between the molten metal 4 and the circumferential surface of the cooling drum 1 deteriorates, and irregular gaps are likely to be formed at the interface. This gap reduces the amount of heat transferred to the cooling drum 1, causing the growth of the solidified shell and the cooling rate to vary irregularly in the longitudinal direction of the slab.
【００１０】その結果、鋳造された薄肉鋳片に横皺が発
生する。また横皺発生に至らないまでも、表面波５によ
って凝固シェルの成長や冷却条件が不規則に変動するた
め、薄肉鋳片の熱履歴が局所的に異なったものとなる。[0010] As a result, horizontal wrinkles occur in the cast thin slab. Furthermore, even if horizontal wrinkles do not occur, the growth of the solidified shell and the cooling conditions vary irregularly due to the surface waves 5, so that the thermal history of the thin slab becomes locally different.
【００１１】この熱履歴の相違は、製品表面に光沢ムラ
，粗大結晶組織等の欠陥として現れ、特に表面性状を重
要視するステンレス鋼薄板等に於いては商品価値を著し
く低下させる。この表面波５はディンプル２の穴径と穴
深さと穴間隔が大きく関与しており、穴径を小さくする
ことと、穴深さを深くすること、穴間隔を小さくするこ
とによって抑制の効果があることが判った。[0011] This difference in thermal history appears as defects such as uneven gloss and coarse crystal structure on the surface of the product, and significantly lowers the commercial value of stainless steel sheets and the like, where surface quality is particularly important. The surface waves 5 are largely influenced by the hole diameter, hole depth, and hole spacing of the dimples 2, and can be suppressed by reducing the hole diameter, deepening the hole depth, and shortening the hole spacing. I found out something.
【００１２】しかしこの種のディンプル２は、通常エッ
チングにより形成されてきたため、***径かつ穴深さを
大きくすることは困難であった。また穴間隔を自由に変
化させることは時間的にも費用的にも負担が大きく実現
可能ではなかった。However, since this type of dimple 2 is usually formed by etching, it has been difficult to increase the diameter and depth of the hole. In addition, freely changing the hole spacing is burdensome in terms of time and cost, and is not practical.
【００１３】本発明は上記課題を解決した冷却ドラムの
ディンプル形成方法とディンプルの加工装置を提供する
。The present invention provides a method for forming dimples on a cooling drum and a dimple processing apparatus that solve the above-mentioned problems.
【００１４】[0014]
【課題を解決するための手段】本発明は、薄肉鋳片鋳造
用冷却ドラムにディンプルを形成する方法において、０
．３０〜１．０７μｍの波長を有するレーザを用い、レ
ーザの発振周期，出力，ビーム発散角のうち１もしくは
複数の制御によって、径を５００μｍ以下，深さを５０
μｍ以上，穴中心間の距離を穴径の１．０５倍以上５倍
以下とするディンプルを冷却ドラムの表面に形成するこ
とを特徴とする薄肉鋳片鋳造用冷却ドラムのディンプル
形成方法である。[Means for Solving the Problems] The present invention provides a method for forming dimples on a cooling drum for casting thin-walled slabs.
．． Using a laser with a wavelength of 30 to 1.07 μm, the diameter is 500 μm or less and the depth is 50 μm or less by controlling one or more of the laser oscillation period, output, and beam divergence angle.
A method for forming dimples in a cooling drum for casting thin slabs, characterized in that dimples are formed on the surface of the cooling drum with a distance of 1.05 to 5 times the hole diameter, and the distance between hole centers is 1.05 to 5 times the hole diameter.
【００１５】また本発明は、上記形成方法において、冷
却ドラムの表面に形成するディンプルの縁の高さを、深
さの１／５０以下とする。Further, in the present invention, in the above-mentioned forming method, the height of the edge of the dimple formed on the surface of the cooling drum is set to 1/50 or less of the depth.
【００１６】また本発明は、上記形成方法において、複
数のレーザ発振機を用い、１または複数の集光系で集光
する。Further, in the above-described forming method, the present invention uses a plurality of laser oscillators and focuses the light with one or more focusing systems.
【００１７】また本発明は、上記形成方法において、１
台のレーザ発振機を用い、１つの集光系で集光し、この
集光系を高速振動制御する。[0017] The present invention also provides the above-mentioned forming method, in which:
A single laser oscillator is used to collect light into a single focusing system, and this focusing system is controlled to vibrate at high speed.
【００１８】さらにまた本発明は、 レーザを用いて
薄肉鋳片鋳造用冷却ドラムの表面にディンプルを形成す
るディンプル加工装置において、該加工装置が、レーザ
発振機と、ベンディングミラーおよび集光レンズを内蔵
した加工ヘッドと、該加工ヘッドを冷却ドラムの軸方向
に移動させる加工掃引機構と、前記冷却ドラムを支持す
るドラム受けおよび冷却ドラムの回転機構とから構成さ
れた薄肉鋳片鋳造用のディンプル加工装置である。Furthermore, the present invention provides a dimple processing device for forming dimples on the surface of a cooling drum for casting thin slabs using a laser, the processing device including a laser oscillator, a bending mirror, and a condensing lens. A dimple processing device for casting thin-walled slabs, comprising a processing head, a processing sweep mechanism for moving the processing head in the axial direction of a cooling drum, a drum support for supporting the cooling drum, and a rotation mechanism for the cooling drum. It is.
【００１９】[0019]
【作用】以下作用とともに、図面を用いて本発明を詳細
に説明する。[Operations] The present invention will be explained in detail below with reference to the drawings.
【００２０】図１にレーザドラム加工装置の一例を示す
。レーザ発振機１０から出たレーザビーム１０ａは、ベ
ンディングミラー１２によって加工ヘッド１１内の集光
用レンズ１３に導かれ、ドラム１周面に集光される。
このとき加工条件の制御により、ディンプル２の加工穴
径と加工穴深さ、および穴の配置が制御可能である。FIG. 1 shows an example of a laser drum processing apparatus. A laser beam 10a emitted from a laser oscillator 10 is guided by a bending mirror 12 to a condensing lens 13 in a processing head 11, and condensed onto the circumferential surface of a drum 1. At this time, by controlling the machining conditions, the diameter and depth of the dimple 2 and the arrangement of the holes can be controlled.
【００２１】このときレーザビーム１０ａの波長を０．
３０〜１．０７μｍとしたのは、加工すべきドラム１が
通常、銅製，アルミ製又はニッケル製であり、１．０７
μｍ以上の波長のレーザ光では吸収率が低すぎ、能率的
な加工が得られない。At this time, the wavelength of the laser beam 10a is set to 0.
The reason why the drum 1 to be processed is usually made of copper, aluminum or nickel is set to 30 to 1.07 μm.
Laser light with a wavelength of .mu.m or more has too low absorption rate and cannot perform efficient processing.
【００２２】また０．３０μｍ以下の波長に於いては、
加工のプロセスにおいて、それ以上の波長のレーザによ
る熱加工と異なり、化学的な反応による加工が主になる
ために、効果的な加工が不可能となることによる。[0022] Furthermore, at wavelengths of 0.30 μm or less,
This is because the machining process is mainly based on chemical reactions, unlike thermal machining using a laser with a wavelength longer than that, making effective machining impossible.
【００２３】レーザ発振の周期を制御する理由としては
、ディンプル２の加工位置に規則性，不規則性を付ける
ことが可能であり、溶融金属に発生する表面波の抑制に
有効である。The reason for controlling the period of laser oscillation is that it is possible to create regularity or irregularity in the processing position of the dimples 2, which is effective in suppressing surface waves generated in the molten metal.
【００２４】レーザ出力を制御する理由としては、主に
穴の深さがレーザ出力に比例し、表面波が穴深さと負の
相関関係をもつために、表面波の抑制に有効であるため
である。The reason for controlling the laser output is that the depth of the hole is mainly proportional to the laser output, and since the surface waves have a negative correlation with the hole depth, it is effective in suppressing the surface waves. be.
【００２５】ビーム発散角を制御する理由としては、ビ
ーム発散角と加工ディンプル径がほぼ正比例し、ディン
プル径が表面波の発生に負の相関を持つため、発生する
表面波の抑制に有効であるためである。The reason for controlling the beam divergence angle is that the beam divergence angle and the processed dimple diameter are almost directly proportional, and the dimple diameter has a negative correlation with the generation of surface waves, so it is effective in suppressing the generated surface waves. It's for a reason.
【００２６】ディンプル穴径と、穴深さとの表面波に対
する良好な条件は、図３に示されるように、穴径が５０
０μｍ以下で、穴深さが５０μｍ以上の場合特に抑制が
行われることが判る。As shown in FIG. 3, the dimple hole diameter and hole depth have good conditions for surface waves.
It can be seen that the suppression is particularly effective when the hole depth is 0 μm or less and the hole depth is 50 μm or more.
【００２７】この場合ディンプル２中心の間隔を穴径の
１．０５倍以上としたのは、これ以下であると溶融金属
とドラムの接触面積が少なすぎるため、溶融金属よりド
ラム１に充分な伝熱が得られず、凝固シェルの安定した
成長が不可能となる為であり、また５倍以上とすると、
ドラム上のディンプル２の効果である溶融金属の緩慢な
抜熱が得られないことによる。In this case, the reason why the distance between the centers of the dimples 2 is set to be 1.05 times or more the diameter of the hole is because if it is less than this, the contact area between the molten metal and the drum is too small. This is because heat cannot be obtained and stable growth of the solidified shell becomes impossible, and if it is increased by 5 times or more,
This is because the slow heat removal from the molten metal, which is the effect of the dimples 2 on the drum, cannot be achieved.
【００２８】これらディンプル位置を積極的に制御し発
生する表面波を効果的に抑制する手法としては、図１の
ように複数のレーザ発振機１０を並べ、各々のレーザ発
振周期を制御する手法や、一台のレーザ発振機を用い集
光系を高速振動させることにより実現可能である。As a method for actively controlling the positions of these dimples and effectively suppressing the generated surface waves, there is a method of arranging a plurality of laser oscillators 10 as shown in FIG. 1 and controlling the laser oscillation period of each. This can be achieved by using a single laser oscillator and vibrating the condensing system at high speed.
【００２９】図２に示す１台のレーザ発振機１０を用い
、集光系を高速発振させてディンプル２の位置制御を行
う手法の一例として、レンズ１３をレーザビーム１０ａ
に対して偏心させ高速回転させるこちにより実現する例
をあげている。As an example of a method of controlling the position of the dimple 2 by oscillating the condensing system at high speed using one laser oscillator 10 shown in FIG.
An example is given in which this is achieved by rotating at a high speed while being eccentric to the center.
【００３０】またレーザの熱加工において、特徴とされ
る加工蒸散物による加工部周辺の縁の盛り上がり部分は
、薄肉鋳片の表面性状を著しく低下させるが、レーザの
出力エネルギーを３０ｍＪ〜１００ｍＪ，パルス幅を１
００ｎｓｅｃ程度，レーザ発散角を３ｍｒａｄ以下に制
御することにより、図４に示すようにディンプル２の形
状である縁２ａの高さ２０をディンプルの深さ２１の１
／５０以下とすることができ、この場合薄肉鋳片の表面
性状は問題ないことが判った。In addition, in laser thermal machining, the swollen edges around the machined part caused by process transpiration, which is a characteristic feature, significantly deteriorate the surface quality of thin slabs. width by 1
By controlling the laser divergence angle to 3 mrad or less for about 00 nsec, the height 20 of the edge 2a, which is the shape of the dimple 2, is reduced to 1 of the dimple depth 21, as shown in FIG.
/50 or less, and in this case, it was found that there was no problem with the surface quality of the thin slab.
【００３１】またレーザドラム加工装置は、例えば図１
に示されるように、ドラム受け１５によって保持された
ドラム１を、その軸を中心に回転させるドラム回転機構
１４を持つ。この装置によりドラムを回転させ、円周方
向にディンプル加工を可能とする。Further, the laser drum processing apparatus is shown in FIG.
As shown in FIG. 1, a drum rotation mechanism 14 is provided that rotates the drum 1 held by a drum receiver 15 around its axis. This device rotates the drum and enables dimple processing in the circumferential direction.
【００３２】さらにレーザ加工ヘッド１１は加工掃引機
構１１ａによってドラム軸方向に移動が可能である。こ
の装置によりディンプルを軸方向に分布させる事が可能
となる。これらの移動機構はコンピュータ制御されてお
り、自由に配置デザイン可能である。Furthermore, the laser processing head 11 can be moved in the direction of the drum axis by a processing sweep mechanism 11a. This device makes it possible to distribute the dimples in the axial direction. These moving mechanisms are computer controlled and can be freely designed and arranged.
【００３３】[0033]
【実施例】＜実施例１＞薄肉鋳片鋳造用ドラムに対する
ディンプルの形成において、レーザ出力としてパルス当
たりのエネルギーは各々７０，８０，９０，１００ｍＪ
で、５００パルス／秒，発散角３ｍｒａｄのＹＡＧレー
ザ４台を用い、集光用レンズ（ｆ＝１００ｍｍ）にそれ
ぞれ２０度の角度をもたせ、ディンプルの中心の間隔が
それぞれ２００μｍから２５０μｍとなるように投入し
た。[Example] <Example 1> In the formation of dimples on a drum for casting thin slabs, the laser output energy per pulse was 70, 80, 90, and 100 mJ, respectively.
Using four YAG lasers with 500 pulses/second and a divergence angle of 3 mrad, the focusing lenses (f = 100 mm) were each set at an angle of 20 degrees, and the distance between the centers of the dimples was 200 μm to 250 μm. I put it in.
【００３４】この結果ドラム周面には、穴径１２０，１
５０，１７０，１８０μｍ、穴深さ１００μｍ以上，縁
の高さ１μｍのディンプルが形成でき、５ｍｍ厚で表面
性状の良好な薄肉鋳片が製造された。As a result, there is a hole diameter of 120,1 on the drum circumferential surface.
Dimples of 50, 170, and 180 μm, hole depth of 100 μm or more, and edge height of 1 μm could be formed, and thin slabs with a thickness of 5 mm and good surface quality were manufactured.
【００３５】＜実施例２＞薄肉鋳片鋳造用ドラムに対す
るディンプルの形成において、レーザ出力としてパルス
当たりのエネルギーは各々８０ｍＪで、１０パルス／秒
，発散角３ｍｒａｄのアレキサンドライトレーザを用い
、集光用レンズ（ｆ＝５０ｍｍ）に投入した。<Example 2> In forming dimples on a drum for casting thin slabs, an alexandrite laser with a laser output of 80 mJ of energy per pulse, 10 pulses/sec, and a divergence angle of 3 mrad was used, and a condensing lens was used. (f=50mm).
【００３６】この結果、ドラム周面には穴径１００μｍ
，穴深さ２００μｍ，穴中心の間隔がそれぞれ１２０μ
ｍから１５０μｍ，縁の高さ３μｍのディンプルが形成
でき、５ｍｍ厚で表面性状の良好な薄肉鋳片が製造され
た。As a result, a hole with a diameter of 100 μm was formed on the circumferential surface of the drum.
, hole depth 200μm, hole center spacing 120μm each
A dimple with a diameter of 150 μm and an edge height of 3 μm could be formed, and a thin slab with a thickness of 5 mm and good surface quality was produced.
【００３７】[0037]
【発明の効果】以上説明したように、本発明によるディ
ンプル形成方法および加工装置によれば、冷却ドラムの
表面に、穴径を小径に抑制しかつ穴深さを深くしたディ
ンプルを、規則的あるいは不規則的な間隔で容易に形成
することが出来、それぞれの鋳片に適した表面性状の良
好な薄肉鋳片が安定して製造される。As explained above, according to the dimple forming method and processing apparatus of the present invention, dimples having a small hole diameter and a deep hole can be formed on the surface of the cooling drum in regular or Thin slabs can be easily formed at irregular intervals, and thin slabs with good surface properties suitable for each slab can be stably produced.
【図１】複数のレーザを用いた本発明例のディンプル加
工装置の略側面図である。FIG. 1 is a schematic side view of a dimple processing apparatus according to an example of the present invention using a plurality of lasers.
【図２】一台のレーザを用いた本発明例のディンプル位
置制御の一例を示す概略図である。FIG. 2 is a schematic diagram showing an example of dimple position control according to the present invention using one laser.
【図３】ディンプル径とディンプル深さの表面波抑制関
係を表す図面である。FIG. 3 is a drawing showing the surface wave suppression relationship between dimple diameter and dimple depth.
【図４】レーザにより加工されたディンプルの断面図で
ある。FIG. 4 is a cross-sectional view of a dimple processed by a laser.
【図５】従来の方法における冷却ドラムのメニスカス周
辺の溶融金属の状態を示す斜視図である。FIG. 5 is a perspective view showing the state of molten metal around the meniscus of a cooling drum in a conventional method.
１ 冷却ドラム ２ ディンプル ２ａ ディンプルの縁 ３ 湯だまり部 ４ 溶融金属 ５ 表面波 １０ レーザ発振機 １０ａ レーザビーム １１ 加工ヘッド １１ａ 加工掃引機構 １２ ベンディングミラー １３ 集光レンズ １４ ロール回転機構 １５ ドラム受け ２０ 縁の高さ ２１ ディンプル深さ 1 Cooling drum 2 Dimple 2a Dimple edge 3 Hot water pool area 4 Molten metal 5 Surface waves 10 Laser oscillator 10a Laser beam 11 Processing head 11a Processing sweep mechanism 12 Bending mirror 13. Condensing lens 14 Roll rotation mechanism 15 Drum support 20 Edge height 21 Dimple depth
Claims (5)
ルを形成する方法において、０．３０〜１．０７μｍの
波長を有するレーザを用い、レーザの発振周期，出力，
ビーム発散角のうち１もしくは複数の制御によって、径
を５００μｍ以下，深さを５０μｍ以上，穴中心間の距
離を穴径の１．０５倍以上５倍以下とするディンプルを
冷却ドラムの表面に形成することを特徴とする薄肉鋳片
鋳造用冷却ドラムのディンプル形成方法。1. A method for forming dimples on a cooling drum for casting thin slabs, using a laser having a wavelength of 0.30 to 1.07 μm, and measuring the oscillation period, output,
By controlling one or more of the beam divergence angles, dimples with a diameter of 500 μm or less, a depth of 50 μm or more, and a distance between hole centers of 1.05 times or more and 5 times or less of the hole diameter are formed on the surface of the cooling drum. A method for forming dimples in a cooling drum for casting thin-walled cast slabs.
ルの縁の高さを、深さの１／５０以下とする請求項１記
載の薄肉鋳片鋳造用冷却ドラムのディンプル形成方法。2. The method for forming dimples on a cooling drum for casting thin slabs according to claim 1, wherein the height of the edge of the dimples formed on the surface of the cooling drum is 1/50 or less of the depth.
複数の集光系で集光した請求項１記載の薄肉鋳片鋳造用
冷却ドラムのディンプル形成方法。3. The method for forming dimples on a cooling drum for casting thin slabs according to claim 1, wherein a plurality of laser oscillators are used and the light is focused by one or more focusing systems.
光系で集光し、この集光系を高速振動制御する請求項１
記載の薄肉鋳片鋳造用冷却ドラムのディンプル形成方法
。Claim 4: Using one laser oscillator, condensing light with one condensing system, and controlling this condensing system with high-speed vibration control.
The method for forming dimples in a cooling drum for casting thin-walled slabs.
ラムの表面にディンプルを形成するディンプル加工装置
において、該加工装置が、レーザ発振機と、ベンディン
グミラーおよび集光レンズを内蔵した加工ヘッドと、該
加工ヘッドを冷却ドラムの軸方向に移動させる加工掃引
機構と、前記冷却ドラムを支持するドラム受けおよび冷
却ドラムの回転機構とから構成された薄肉鋳片鋳造用の
ディンプル加工装置。5. A dimple processing device that uses a laser to form dimples on the surface of a cooling drum for casting thin slabs, the processing device comprising a laser oscillator, a processing head incorporating a bending mirror and a condensing lens. A dimple processing device for casting thin-walled slabs, comprising a processing sweep mechanism for moving the processing head in the axial direction of a cooling drum, a drum support for supporting the cooling drum, and a rotation mechanism for the cooling drum.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3012687A JPH0796147B2 (en) | 1991-01-11 | 1991-01-11 | Method for forming dimples on cooling drum for casting thin cast slab |
| US07/927,645 US5391856A (en) | 1991-01-11 | 1992-01-09 | Cooling drum for casting thin cast pieces and method and apparatus for forming dimples in peripheral surface of the drum |
| CA002076747A CA2076747C (en) | 1991-01-11 | 1992-01-09 | Cooling drum for casting thin cast pieces and method and apparatus for forming dimples in peripheral surface of the drum |
| PCT/JP1992/000006 WO1992011960A1 (en) | 1991-01-11 | 1992-01-09 | Cooling drum for casting thin cast piece; device for and method of forming dimples on peripheral surface of said drum |
| EP19920902743 EP0577833A4 (en) | 1991-01-11 | 1992-01-09 | Cooling drum for casting thin cast piece; device for and method of forming dimples on peripheral surface of said drum |
| AU11636/92A AU646547B2 (en) | 1991-01-11 | 1992-01-09 | Cooling drum for casting thin cast piece; device for and method of forming dimples on peripheral surface of said drum |
| KR1019920702123A KR960005881B1 (en) | 1991-01-11 | 1992-01-09 | Cooling drum for casting thin cast piece device and method of forming dimples on peripheral surface of the said drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3012687A JPH0796147B2 (en) | 1991-01-11 | 1991-01-11 | Method for forming dimples on cooling drum for casting thin cast slab |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04238654A true JPH04238654A (en) | 1992-08-26 |
| JPH0796147B2 JPH0796147B2 (en) | 1995-10-18 |
Family
ID=11812291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3012687A Expired - Lifetime JPH0796147B2 (en) | 1991-01-11 | 1991-01-11 | Method for forming dimples on cooling drum for casting thin cast slab |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0796147B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| EP2046516A1 (en) * | 2006-08-02 | 2009-04-15 | Posco | Casting roll for twin roll strip caster |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01224187A (en) * | 1988-03-04 | 1989-09-07 | Nippon Steel Corp | Method and device for dulling roll surface for rolling |
-
1991
- 1991-01-11 JP JP3012687A patent/JPH0796147B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01224187A (en) * | 1988-03-04 | 1989-09-07 | Nippon Steel Corp | Method and device for dulling roll surface for rolling |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| EP2046516A1 (en) * | 2006-08-02 | 2009-04-15 | Posco | Casting roll for twin roll strip caster |
| EP2046516A4 (en) * | 2006-08-02 | 2010-05-26 | Posco | Casting roll for twin roll strip caster |
| AU2007279546B2 (en) * | 2006-08-02 | 2011-01-27 | Posco | Casting roll for twin roll strip caster |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0796147B2 (en) | 1995-10-18 |
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