KR930000004B1 - Molten Metal Discharge Nozzle of Casting Machine - Google Patents
Molten Metal Discharge Nozzle of Casting Machine Download PDFInfo
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- KR930000004B1 KR930000004B1 KR1019910008690A KR910008690A KR930000004B1 KR 930000004 B1 KR930000004 B1 KR 930000004B1 KR 1019910008690 A KR1019910008690 A KR 1019910008690A KR 910008690 A KR910008690 A KR 910008690A KR 930000004 B1 KR930000004 B1 KR 930000004B1
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- nozzle
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- cao
- molten metal
- discharge nozzle
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Abstract
내용 없음.No content.
Description
제1도는 본 발명에 의한 노즐의 한 가지 실시예의 종단면도.1 is a longitudinal sectional view of one embodiment of a nozzle according to the present invention;
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
13 : 본체부 12 : 내면부13 body part 12 inner part
14 : 노즐 구멍14: nozzle hole
본 발명은 주조 장치에 이용되는, 용융금속 배출용 노즐에 관한 것이다.The present invention relates to a nozzle for discharging molten metal used in a casting apparatus.
연속 배출용 침지 노즐 같은 용융 금속 배출용 노즐의 재료로 알루미늄-흑연 및 지르콘-흑연이 널리 이용되어 왔다. 이들 재료는 용융된 강에 대한 내식성이 우수하지만 열전도율이 높기 때문에 모재가 용착되는 경향을 가진다는 문제가 있다. 특히 알루미늄 킬드 강(killed steel)같은 알루미늄 함량이 높은 강의 경우에는 Al2O3같은 알루미늄 산화물이 용착되어 노즐의 구멍이 막히는 경향이 있어 주조 작업을 중단할 필요가 있다.Aluminum-graphite and zircon-graphite have been widely used as materials for nozzles for molten metal discharge, such as immersion nozzles for continuous discharge. These materials are excellent in corrosion resistance to molten steel but have a problem that the base metal tends to be welded because of high thermal conductivity. Particularly in steels with high aluminum content, such as aluminum killed steel, aluminum oxides such as Al 2 O 3 are deposited and the holes in the nozzles tend to be clogged, so it is necessary to stop casting.
모재의 용착에 의한 폐색에 대하여는 예열 조건 및 절연을 개선시키는 등의 대책으로 약간의 효과를 볼 수 있다.The blockage caused by welding of the base metal can have some effects as a countermeasure such as improving preheating conditions and insulation.
한편 알루미늄 산화물로 인한 폐색을 방지하기 위하여 노즐 구멍을 형성하는 내면부에 다공성 내화물(porous refractory)을 구비시켜 이를 통하여 불활성 가스를 공급하는 슬릿형 침지 노즐이 이용되었다. 그러나 슬릿형 침지 노즐은 다음과 같은 결점이 있다.Meanwhile, in order to prevent blockage due to aluminum oxide, a slit-type immersion nozzle having a porous refractory provided at an inner surface forming a nozzle hole and supplying an inert gas therethrough has been used. However, slit immersion nozzles have the following drawbacks.
용융 금속의 배출구와 인접하게 슬릿을 형성시키기 어렵기 때문에 배출구 근처에서의 금속 용착 및 폐색을 방지하기가 거의 불가능하다. 또한, 배출과정이 반복되는데 따라 다공성 내화물에 함유된 탄소는 서서히 산화되는 반면 SiO2는 C-CO 환원 분위기와 반응하여 SiO로 되어 이 상태로 소산된다. 이에 따라 다공성 내화물의 가스 투과도가 증가하고 불활성 가스의 투과 속도 조절이 어려워진다. 또, 불활성 가스 공급이 증가되면 주강 내에 핀홀 형성이 촉진된다.Since it is difficult to form a slit adjacent to the outlet of the molten metal, it is almost impossible to prevent metal deposition and blockage near the outlet. In addition, as the discharge process is repeated, the carbon contained in the porous refractory is gradually oxidized, while SiO 2 reacts with the C-CO reducing atmosphere to become SiO and dissipates in this state. This increases the gas permeability of the porous refractory and makes it difficult to control the permeation rate of the inert gas. In addition, an increase in inert gas supply promotes pinhole formation in the cast steel.
노즐 재료를 개선하여 폐색을 방지하는 여러가지 방안이 시도되었다. 예를 들면 일본 특허 출원 공개 제57-71860호에는 CaO-흑연 형 내화물을 사용하여 노즐 성분이 용융 강의 Al2O3와 반응하여 CaO-Al2O3형 저융점 물질이 생성되도록 함으로써 내면에 용착되려는 경향이 있는 Al2O3를 배제하는 방법이 제안되어 있다.Various approaches have been attempted to improve the nozzle material to prevent clogging. For example, Japanese Patent Application Laid-Open No. 57-71860 uses CaO-graphite refractory to deposit a CaO-Al 2 O 3 type low melting point material by reacting the nozzle component with Al 2 O 3 in the molten steel to deposit it on the inner surface. A method of excluding Al 2 O 3 that tends to be proposed is proposed.
그러나 CaO-Al2O3형 물질은 항상 저융점 물질로 되지는 않으며 Al2O3용착의 코어(core)가 되어 폐색을 촉진하는 고융점 물질로 형성될 수도 있다.However, the CaO-Al 2 O 3 type material does not always become a low melting point material, but may also be formed as a high melting point material that promotes occlusion as a core of Al 2 O 3 deposition.
본 발명의 목적은 노즐 구멍의 폐색을 효과적으로 방지할 수 있는, 주조 장치에 이용되는 용융 금속 배출용 노즐을 제공하는 것이다.An object of the present invention is to provide a nozzle for discharging molten metal for use in a casting apparatus, which can effectively prevent clogging of nozzle holes.
이 목적은 주조 장치에 이용되는 용융 금속 배출용 노즐에 있어서, 적어도 상기 노즐의 노즐 구멍을 형성하는 내면부가 CaO와 SiO2를 포함하는 내화물로 제작되고, 상기 SiO2에 대한 상기 CaO의 비가 0.18 내지 1.86이며, 상기 내면부의 Al2O3함량이 상기 CaO 및 SiO2총 중량의 10중량% 이하인 노즐에 의하여 달성된다.This object is a molten metal discharge nozzle used in a casting apparatus, wherein at least an inner surface portion forming the nozzle hole of the nozzle is made of a refractory including CaO and SiO 2 , and the ratio of CaO to SiO 2 is 0.18 to 1.86, wherein the Al 2 O 3 content of the inner surface portion is achieved by a nozzle of 10% by weight or less of the total weight of the CaO and SiO 2 .
상술한 바와 같이 본 발명에 의하면 폐색을 효과적으로 방지할 수 있는, 주조 장치에 이용되는 용융 금속 배출용 노즐이 제공된다.As described above, according to the present invention, there is provided a nozzle for discharging molten metal used in a casting apparatus, which can effectively prevent clogging.
본 발명의 노즐(청구범위 제1항)에서는 내면부의 CaO대 SiO2의 비가 0.18 내지 1.86으로 되어, Al2O3가 내면에 융착된 경우에도 CaO및 SiO2와 반응하여 용융 강의 온도보다 융점이 낮은 화합물을 형성하고 용융 강 내로 녹아들어가 넓은 범위의 작업 조건에서 폐색이 일어나지 않는 노즐이 제공된다.In the nozzle (claim 1) of the present invention, the ratio of CaO to SiO 2 in the inner surface portion is 0.18 to 1.86, and even when Al 2 O 3 is fused to the inner surface, the melting point is higher than the temperature of the molten steel by reacting with CaO and SiO 2. Nozzles are provided that form low compounds and melt into the molten steel so that occlusion does not occur over a wide range of operating conditions.
CaO와 SiO2의 비가 상기 범위를 벗어나면 요구되는 저융점 액체 상이 효과적으로 생성되지 않는 대신 Al2O3의 CaO와 고체상 반응으로부터 고융점 칼슘 알루미네이트가 생성되고, 이러한 고융점 화합물은 Al2O3용착의 코어 역할을 한다. Al2O3의 함량이 CaO 및 SiO2의 전중량의 10중량% 이상이 되면 Al2O3가 CaO 및 SiO2와 반응하여 노즐 자체의 융점이 낮아져 용융에 의한 손상이 생기기 쉬워진다.If the ratio of CaO and SiO 2 is out of the above range, the required low melting liquid phase is not effectively produced, but high melting point calcium aluminate is formed from the solid phase reaction of CaO with Al 2 O 3 , and the high melting point compound is Al 2 O 3. It serves as a core for welding. When the Al 2 O 3 content is 10% by weight or more of the total weight of CaO and SiO 2 , Al 2 O 3 reacts with CaO and SiO 2 to lower the melting point of the nozzle itself, which is likely to cause damage due to melting.
본 발명에서 주조 작업중 내면에 용착된 Al2O3는 CaO 및 SiO2와 화학 반응을 일으켜 융점이 1,500℃ 이하인 액체상을 생성시킨다. 이 액체상은 용융된 강과 함께 유출되어 내면에 Al2O3의 용착 및 집적이 발생하지 않는다.In the present invention, Al 2 O 3 deposited on the inner surface during the casting operation chemically reacts with CaO and SiO 2 to produce a liquid phase having a melting point of 1,500 ° C. or less. This liquid phase flows out with the molten steel so that deposition and accumulation of Al 2 O 3 does not occur on the inner surface.
이하 첨부 도면을 참조하여 본 발명의 실시예를 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
제1도는 본 발명에 의한 노즐의 단면도이다. 이 노즐에서 본체부(13)는 통상적인 내화물(주성분 Al2O3및 C)로 제작되고, 노출 구멍(14)이 형성된 내면부(12)는 규정된 비의 CaO 및 SiO2를 함유한다. 실시예 11 내지 19의 노즐에서 내면부(12)의 조성 및 CaO대 SiO2의 비는 표에 기재되어 있다. 비교실시예 11 내지 13의 노즐도 비교를 위하여 표에 기재되어 있다.1 is a cross-sectional view of a nozzle according to the present invention. In this nozzle, the main body portion 13 is made of ordinary refractory materials (main components Al 2 O 3 and C), and the inner surface portion 12 on which the exposure holes 14 are formed contains a prescribed ratio of CaO and SiO 2 . The composition of the inner surface portion 12 and the ratio of CaO to SiO 2 in the nozzles of Examples 11 to 19 are listed in the table. The nozzles of Comparative Examples 11-13 are also listed in the table for comparison.
이들 노즐은 각각 동일한 턴디쉬에 장착되어 알루미늄 킬드강을 연속적으로 5회 주조하였다. 주조 작업후 각 노즐에 대하여 A-A단면(제1도)을 따라 노즐 구멍(14)의 감소율을 측정하고, 그 결과를 표의 최하단에 나타내었다.These nozzles were each mounted in the same tundish and cast five successive pieces of aluminum killed steel. The reduction rate of the nozzle hole 14 was measured along A-A cross section (FIG. 1) about each nozzle after a casting operation, and the result is shown in the lower part of a table | surface.
표에 기재된 바와 같이 본 발명에 의한 실시예 11 내지 19의 노즐은 비교실시예 11 내지 13의 노즐에 비하여 감소율이 1/3이하이면 이는 본 발명이 폐색 방지에 큰 효과가 있음을 나타낸다.As described in the table, when the nozzles of Examples 11 to 19 according to the present invention have a reduction ratio of 1/3 or less compared to the nozzles of Comparative Examples 11 to 13, this indicates that the present invention has a great effect on preventing clogging.
본 발명의 노즐에서 SiO2는 일부가 Si로 치환될 수 있다. 또는 내면에서 SiO2로 산화되므로 이 경우에도 상술한 것과 동일한 효과를 얻을 수 있다.In the nozzle of the present invention, SiO 2 may be partially substituted by Si. Alternatively, since the oxide is oxidized to SiO 2 in the inner surface, the same effects as described above can be obtained in this case.
이상 본 발명은 바람직한 실시예에 대하여 설명되었지만 이 분야에서 숙달된 자는 본 발명의 범위를 벗어나지 않고 여러가지 수정 및 변경을 가할 수 있을 것이다. 예를 들면, 내면부의 조성에 있어, 특정 조건(Al2O3의 함량이 SiO 및 CaO 총 중량의 10중량% 미만)이 충족된다면 실시예 11 내지 19에서 이용된 것과 다른 물질을 이용할 수도 있다.While the present invention has been described with respect to the preferred embodiments, those skilled in the art may make various modifications and changes without departing from the scope of the present invention. For example, in the composition of the inner surface portion, a material different from that used in Examples 11 to 19 may be used if certain conditions (content of Al 2 O 3 is less than 10% by weight of the total weight of SiO and CaO) are satisfied.
[표][table]
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019910008690A KR930000004B1 (en) | 1987-09-03 | 1991-05-27 | Molten Metal Discharge Nozzle of Casting Machine |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62220691A JP2651444B2 (en) | 1987-09-03 | 1987-09-03 | Immersion nozzle for continuous casting of steel |
| JP220691 | 1987-09-03 | ||
| JP279132 | 1987-11-06 | ||
| JP62279132A JPH01122644A (en) | 1987-11-06 | 1987-11-06 | Nozzle for casting |
| KR1019880011432A KR910006897B1 (en) | 1987-09-03 | 1988-09-03 | A nozzle for discharging molten metal used in a casting device |
| KR1019910008690A KR930000004B1 (en) | 1987-09-03 | 1991-05-27 | Molten Metal Discharge Nozzle of Casting Machine |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019880011432A Division KR910006897B1 (en) | 1987-09-03 | 1988-09-03 | A nozzle for discharging molten metal used in a casting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR930000004B1 true KR930000004B1 (en) | 1993-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019910008690A Expired - Fee Related KR930000004B1 (en) | 1987-09-03 | 1991-05-27 | Molten Metal Discharge Nozzle of Casting Machine |
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| Country | Link |
|---|---|
| KR (1) | KR930000004B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190020924A (en) | 2017-08-22 | 2019-03-05 | (주)넥스트에이 | Method for cultivating ginseng and ginseng cultivated by the same |
-
1991
- 1991-05-27 KR KR1019910008690A patent/KR930000004B1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190020924A (en) | 2017-08-22 | 2019-03-05 | (주)넥스트에이 | Method for cultivating ginseng and ginseng cultivated by the same |
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