JPH0436774B2 - - Google Patents
Info
- Publication number
- JPH0436774B2 JPH0436774B2 JP20007583A JP20007583A JPH0436774B2 JP H0436774 B2 JPH0436774 B2 JP H0436774B2 JP 20007583 A JP20007583 A JP 20007583A JP 20007583 A JP20007583 A JP 20007583A JP H0436774 B2 JPH0436774 B2 JP H0436774B2
- Authority
- JP
- Japan
- Prior art keywords
- drum
- point
- slab
- equation
- water
- 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
Links
- 238000005266 casting Methods 0.000 claims description 29
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 230000007935 neutral effect Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
Description
【発明の詳細な説明】
〔本発明の技術分野〕
本発明は、鉄および非鉄金属ならびに合金など
の帯状の薄板を連続的に鋳造する方法に関する。
特に、本発明は、ツインドラム方式による薄板連
続鋳造方法に関する。TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for continuously casting thin strips of ferrous and non-ferrous metals and alloys.
In particular, the present invention relates to a continuous thin plate casting method using a twin-drum method.
２つのドラム間に溶湯を注湯し薄板を連続鋳造
するツインドラム方式連続鋳造機では、薄板の板
厚が２〜５mmの場合ドラムと接触して溶湯が凝固
する時間、いわゆる凝固時間は通常0.5〜2secで
ある。この短時間の凝固を厳密に制御すること
が、得られた鋳片の性状を良好に保つため必須で
あるが、従来の方法ではこの制御が充分でなく鋳
片に横割れあるいはバルジング（鋳片表面のふく
れ現象）が生じ、鋳片性状は必ずしも満足できる
ものではなかつた。
In a twin-drum continuous casting machine that pours molten metal between two drums and continuously casts thin plates, when the thickness of the thin plate is 2 to 5 mm, the time required for the molten metal to solidify upon contact with the drums, the so-called solidification time, is usually 0.5 mm. ~2sec. Strict control of this short-time solidification is essential in order to maintain good properties of the resulting slab, but conventional methods have not been able to adequately control this, resulting in horizontal cracking or bulging in the slab. Surface blistering) occurred, and the slab properties were not necessarily satisfactory.
そこで、本発明は、ドラム面での溶湯の凝固を
制御し、鋳片性状の向上を図る薄板連続鋳造方法
を提供することを目的とする。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a continuous thin plate casting method that controls the solidification of molten metal on the drum surface and improves the properties of slabs.
そして、本発明は、上記目的を達成する手段と
して、ドラム面で溶湯が冷却され生じた２枚の凝
固シエルの合致点の位置を、ドラム径や鋳片板厚
に応じてコントロールする点にある。すなわち、
本発明は、ツインドラム方式による薄板連続鋳造
方法において、ドラム中立点からドラム面上の２
枚の凝固シエルの合致点までの高さｌ（mm）及び
ドラム中立点線上における未凝固部分の幅ｍ（mm）
を測定し、上記高さｌが下記式(1)の上限値に至る
以前にドラム回転速度を上げ、上記幅ｍが下記式
(2)の上限値に至る以前にドラムの回転速度を落す
ことを特徴とする薄板連続鋳造方法。
The present invention, as a means for achieving the above object, consists in controlling the position of the matching point of two solidified shells produced by cooling the molten metal on the drum surface in accordance with the drum diameter and slab thickness. . That is,
The present invention provides two casters on the drum surface from the neutral point of the drum in a twin-drum continuous thin plate casting method.
Height l (mm) of the two solidified shells to the matching point and width m (mm) of the unsolidified portion on the drum neutral dotted line
The drum rotation speed is increased before the height l reaches the upper limit of the formula (1) below, and the width m is determined by the formula below.
(2) A thin plate continuous casting method characterized by reducing the rotational speed of the drum before reaching the upper limit value.
(1)式
ｌ≦√0.2・・
(2)式
ｍ≦0.7t／logh
〔但し、(1)式は、ドラム面上の２枚の凝固シエル
の合致点がドラムの中立点より上にある場合、(2)
式は、ドラムの中立点より下にある場合に適用す
る。なお、ｔは、鋳片板厚（mm）、Ｒは、鋳造ド
ラムの半径（mm）、ｈは、２枚の凝固シエルの合
致点から溶湯表面までの高さ（mm）を示す。〕で
ある。(1) Equation l≦√0.2... (2) Equation m≦0.7t/logh [However, in Equation (1), the matching point of the two solidified shells on the drum surface is above the neutral point of the drum. If (2)
The formula applies below the neutral point of the drum. Note that t is the slab plate thickness (mm), R is the radius of the casting drum (mm), and h is the height (mm) from the matching point of the two solidified shells to the molten metal surface. ].
以下、第３図に基づいて、本発明を実施するの
に好適なツインドラム方式による薄板連続鋳造装
置を説明する。この装置は、薄板鋳片３を鋳造す
る水冷鋳造ドラム１，１′、この水冷鋳造ドラム
１，１′間の溶湯４の洩れを防止するサイド固定
せき２，２′および溶鋼等の溶湯４を溜めるタン
デイツシユ５などを主要構成部材としている。 Hereinafter, based on FIG. 3, a twin-drum continuous thin plate casting apparatus suitable for carrying out the present invention will be described. This device consists of water-cooled casting drums 1, 1' for casting thin plate slabs 3, side fixed weirs 2, 2' for preventing leakage of molten metal 4 between the water-cooled casting drums 1, 1', and molten metal 4 such as molten steel. The main components include a tundish 5 for storing water.
この装置を詳細に説明すると、水冷鋳造ドラム
１，１′は水平に設置されており、図示しない駆
動装置による回転（矢示方向）駆動される。この
水冷鋳造ドラム１，１′は例えば鋼または銅合金
あるいは鋼材により形成され、内部に水冷機構を
内蔵するものであり、溶湯４との接触面積を大き
く得るため相当大径のドラムとなつている。また
水冷鋳造ドラム１，１′の両端部には、サイドを
シールするための耐火材からなる固定せき２，
２′が押し当てられており、２本の水冷鋳造ドラ
ム１，１′と２個の固定せき２，２′で形成される
空間に溶湯４が注湯される。溶湯４が水冷鋳造ド
ラム１，１′の表面に接触して冷却され出来た凝
固シエルは一体化され鋳片３となる。この鋳片３
はピンチロール６により引抜かれる。なお７はガ
イドロールである。 To explain this apparatus in detail, the water-cooled casting drums 1, 1' are installed horizontally and are rotationally driven (in the direction of the arrow) by a drive device (not shown). The water-cooled casting drums 1 and 1' are made of, for example, steel, copper alloy, or steel material, and have a built-in water cooling mechanism, and have a considerably large diameter in order to obtain a large contact area with the molten metal 4. . Furthermore, fixed weirs 2 made of refractory material for sealing the sides are installed at both ends of the water-cooled casting drums 1 and 1'.
2' are pressed against each other, and molten metal 4 is poured into the space formed by the two water-cooled casting drums 1, 1' and the two fixed weirs 2, 2'. The molten metal 4 comes into contact with the surfaces of the water-cooled casting drums 1 and 1', and the resulting solidified shell is integrated into a slab 3. This slab 3
is pulled out by the pinch roll 6. Note that 7 is a guide roll.
この装置において、鋳片３の性状を良好に保つ
ための本発明を、第１図および第２図に基づいて
詳細に説明する。 The present invention for maintaining good properties of the slab 3 in this apparatus will be explained in detail with reference to FIGS. 1 and 2.
第１図は、２枚の凝固シエルの合致点（Ｐ点）
が水冷鋳造ドラム１，１′の中立点の上にある場
合を示すものである。この場合、水冷鋳造ドラム
１，１′の中立点からドラム面上の２枚の凝固シ
エルの合致点までの高さｌ（mm）とすると、本発
明では、次の(1)式を満足するようにＰ点をドラム
の回転速度によつてコントロールするものであ
る。 Figure 1 shows the matching point (P point) of the two solidified shells.
is above the neutral point of the water-cooled casting drums 1, 1'. In this case, if the height from the neutral point of the water-cooled casting drums 1, 1' to the matching point of the two solidified shells on the drum surface is l (mm), then in the present invention, the following equation (1) is satisfied. The point P is controlled by the rotational speed of the drum.
(1)式
ｌ≦√0.2・・
〔ただし、(1)式中、ｔは鋳片３の板厚（mm）、Ｒ
は水冷鋳造ロール１，１′の半径（mm）を示す。〕
本発明において、上記(1)式を満足するようにＰ
点をコントロールする理由は、仮に(1)式を満足し
ない場合、過凝固となり、水冷鋳造ドラム１，
１′の中立点近傍で圧延され、鋳片３の表面に横
割れが生じ、鋳片性状を著しく害することとなる
からである。(1) Formula l≦√0.2... [However, in formula (1), t is the plate thickness (mm) of slab 3, R
indicates the radius (mm) of the water-cooled casting rolls 1, 1'. ] In the present invention, P is set such that the above formula (1) is satisfied.
The reason for controlling the point is that if equation (1) is not satisfied, oversolidification will occur and the water-cooled casting drum 1,
This is because the slab 3 is rolled near the neutral point of 1', and transverse cracks occur on the surface of the slab 3, which significantly impairs the properties of the slab.
第２図は、２枚の凝固シエルの合致点（Ｐ点）
が水冷鋳造ドラム１，１′の中立点より下にある
場合を示すものである。この場合、ロールの中立
線上における未凝固部分の幅をｍ（mm）とすると、
本発明では、次の(2)式を満足するようにＰ点をド
ラムの回転速度によつてコントロールするもので
ある。 Figure 2 shows the matching point (point P) of the two solidified shells.
is below the neutral point of the water-cooled casting drums 1, 1'. In this case, if the width of the unsolidified portion on the neutral line of the roll is m (mm),
In the present invention, the point P is controlled by the rotational speed of the drum so as to satisfy the following equation (2).
(2)式
ｍ≦0.7・ｔ／logh
〔ただし、ｔは鋳片３の板厚（mm）、ｈは２枚の
凝固シエルの合致点から溶湯表面までの高さ、即
ち、溶湯ヘツド（mm）を示す。〕
本発明において、上記(2)式を満足するようにＰ
点をコントロールする理由は、仮に(2)式を満足し
ない場合未凝固となり、水冷鋳造ドラム１，１′
の中立点を通過した後鋳片３の表面にバルジング
現象が生じ、鋳片性状を著しく害することになる
からである。Equation (2) m≦0.7・t/log h [where t is the plate thickness (mm) of the slab 3, and h is the height from the matching point of the two solidified shells to the molten metal surface, that is, the molten metal head ( mm). ] In the present invention, P is set such that the above formula (2) is satisfied.
The reason for controlling the point is that if equation (2) is not satisfied, it will not solidify and the water-cooled casting drums 1, 1'
This is because a bulging phenomenon occurs on the surface of the slab 3 after passing through the neutral point of the slab, which significantly impairs the properties of the slab.
以下、本発明の具体例をあげて、本発明をより
詳細に説明する。 Hereinafter, the present invention will be explained in more detail by giving specific examples of the present invention.
鋼を鋳造した場合の構成部材の寸法ならびに諸
条件は次のとおりである。
The dimensions and various conditions of the structural members in the case of casting steel are as follows.
(1) 水冷鋳造ドラム
鋼製で内部水冷方式。ドラム直径は2000mm
φ、ドラム幅1200mm、鋳片寸法は３mmt×1200
mm幅であり、このときドラム回転速度（鋳造速
度）は約28ｍ／minである。(1) Water-cooled casting drum Made of steel and internally water-cooled. Drum diameter is 2000mm
φ, drum width 1200mm, slab size 3mm t ×1200
mm width, and the drum rotation speed (casting speed) is approximately 28 m/min.
(2) 溶湯
通常の鋼の場合タンデイツシユ内溶湯温度は
1520〜1560℃である。また水冷鋳造ドラム上の
溶湯のヘツド(h)は約1000mmである。(2) Molten metal For normal steel, the temperature of the molten metal in the tundish is
The temperature is 1520-1560℃. The head (h) of the molten metal on the water-cooled casting drum is approximately 1000 mm.
以上の諸条件で(1)式を満足するようｌを約24mm
以下また(2)式を満足するようｍを約0.7mm以下に
ドラム面上の凝固を制御した。その結果、表面横
割れおよびバルジングのない良好な性状を有する
鋳片が安定して得られた。 Under the above conditions, l should be approximately 24mm to satisfy equation (1).
Hereinafter, solidification on the drum surface was controlled so that m was approximately 0.7 mm or less so as to satisfy equation (2). As a result, slabs with good properties without surface transverse cracks and bulging were stably obtained.
本発明は、以上詳細したように、ツインドラム
方式薄板連続鋳造機においてドラム面で生成され
る凝固シエルを前記(1)式又は(2)式を満足するよう
制御するものであるから、薄板鋳片の性状を良好
に保つことができる効果が生ずるものである。す
なわち、本発明は、表面横割れおよびバルジング
のない良好な性状を有する薄板鋳片が安定して得
られる顕著な効果が生ずるものである。
As detailed above, the present invention controls the solidified shell produced on the drum surface in a twin-drum continuous thin plate casting machine so as to satisfy the above formula (1) or (2). This has the effect of keeping the properties of the pieces good. That is, the present invention has the remarkable effect of stably obtaining a thin slab having good properties without surface transverse cracks and bulging.
第１図および第２図は、水冷鋳造ドラム面上の
２枚の凝固シエルの合致点の状況を模式的に示し
た図であり、第３図は、本発明を実施するのに好
適なツインドラム方式による薄板連続鋳造装置の
縦断面図である。
１，１′……水冷鋳造ドラム、２，２′……サイ
ド固定せき、３……鋳片、４……溶湯、５……タ
ンデイツシユ、６……ピンチロール、７……ガイ
ドロール。
1 and 2 are diagrams schematically showing the situation of matching points of two solidified shells on the surface of a water-cooled casting drum, and FIG. 3 is a diagram showing a twin shell suitable for carrying out the present invention. FIG. 1 is a longitudinal cross-sectional view of a drum-type continuous thin plate casting apparatus. 1, 1'... Water-cooled casting drum, 2, 2'... Side fixed weir, 3... Slab, 4... Molten metal, 5... Tundish, 6... Pinch roll, 7... Guide roll.
Claims (1)
おいて、ドラム中立点からドラム面上の２枚の凝
固シエルの合致点までの高さｌ（mm）及びドラム
中立点線上における未凝固部分の幅ｍ（mm）を測
定し、上記高さｌが下記式(1)の上限値に至る以前
にドラムの回転速度を上げ、上記幅ｍが下記式(2)
の上限値に至る以前にドラムの回転速度を落すこ
とを特徴とする薄板連続鋳造方法。 (1)式 ｌ≦√0.2・・ (2)式 ｍ≦0.7t／logh 〔但し、(1)式は、ドラム面上の２枚の凝固シエル
の合致点がドラムの中立点より上にある場合、(2)
式は、ドラムの中立点より下にある場合に適用す
る。なお、ｔは、鋳片板厚（mm）、Ｒは、鋳造ド
ラムの半径（mm）、ｈは、２枚の凝固シエルの合
致点から溶湯表面までの高さ（mm）を示す。〕[Claims] 1. In a thin plate continuous casting method using a twin drum system, the height l (mm) from the neutral point of the drum to the matching point of two solidified shells on the drum surface and the unsolidified portion on the drum neutral dotted line. Measure the width m (mm) of
A thin plate continuous casting method characterized by reducing the rotational speed of the drum before reaching the upper limit value. (1) Equation l≦√0.2... (2) Equation m≦0.7t/logh [However, in Equation (1), the matching point of the two solidified shells on the drum surface is above the neutral point of the drum. If (2)
The formula applies below the neutral point of the drum. Note that t is the slab plate thickness (mm), R is the radius of the casting drum (mm), and h is the height (mm) from the matching point of the two solidified shells to the molten metal surface. ]
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20007583A JPS6092051A (en) | 1983-10-27 | 1983-10-27 | Continuous casting method of thin sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20007583A JPS6092051A (en) | 1983-10-27 | 1983-10-27 | Continuous casting method of thin sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6092051A JPS6092051A (en) | 1985-05-23 |
| JPH0436774B2 true JPH0436774B2 (en) | 1992-06-17 |
Family
ID=16418426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20007583A Granted JPS6092051A (en) | 1983-10-27 | 1983-10-27 | Continuous casting method of thin sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6092051A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2697908B2 (en) * | 1989-08-03 | 1998-01-19 | 新日本製鐵株式会社 | Control device of twin roll continuous casting machine |
-
1983
- 1983-10-27 JP JP20007583A patent/JPS6092051A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6092051A (en) | 1985-05-23 |
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