KR20020076491A

KR20020076491A - Method for manufacturing the flux for liquid metal

Info

Publication number: KR20020076491A
Application number: KR1020010016352A
Authority: KR
Inventors: 하토리다케오
Original assignee: (주)아키
Priority date: 2001-03-28
Filing date: 2001-03-28
Publication date: 2002-10-11

Abstract

본 발명은 금속용탕에 첨가되어 불순물을 제거하여주는 용탕 개량용 플럭스에 관한 것으로, 유화철분말 60∼80중량%와 규회석분말 20∼40중량%를 혼합하여 450∼ 600℃의 온도에서 3∼5시간 가열하여 제조되어진 첨가제분말에, 철분말과 동분말, 규소분말, 알루미늄분말, 탄소분말, 규소분말, 알루미늄분말, 산화규소분말, 산화알루미늄분말, 산화제2철분말, 페로망간분말, 형석, 붕사, 염화나트륨, 불화나트륨 및 탄화규소분말 등을 선택적으로 첨가하여 플럭스를 제조하므로써, 철계합금과 동계합금과 알루미늄계합금을 주조하는 과정에서 불순물의 제거작업이 원활하게 이루어지므로, 금속조직의 균질화가 이루어져 기계적 특성이 향상될 뿐만 아니라, 주물표면품질이 향상되어 주조과정에서 발생하는 제반 부대비용이 절감되게 한 것이다.The present invention relates to a molten metal flux which is added to a molten metal to remove impurities. The present invention relates to a molten iron powder 60 to 80% by weight and wollastonite powder 20 to 40% by weight at a temperature of 3 to 5 at a temperature of 450 to 600 ° C. Iron powder, copper powder, silicon powder, aluminum powder, carbon powder, silicon powder, aluminum powder, silicon oxide powder, aluminum oxide powder, ferric oxide powder, ferro-manganese powder, fluorspar, borax By selectively adding sodium chloride, sodium fluoride, and silicon carbide powder, the flux is produced, so that impurities are smoothly removed during the casting of the iron alloy, the copper alloy, and the aluminum alloy, thereby homogenizing the metal structure. Not only the mechanical properties are improved, but the casting surface quality is improved to reduce the overall costs incurred in the casting process.

Description

Method for manufacturing flux for improving molten metal {Method for manufacturing the flux for liquid metal}

본 발명은 금속주조과정에서 용탕으로 첨가되어 불순물을 제거하는 플럭스에 관한 것으로, 특히 유화철분말과 규회석분말의 혼합물을 가열처리한 첨가제에 용탕 성분에 따라 별도의 조성물을 첨가하여 플럭스로 제조시킬 수 있도록 된 용탕개량용 플럭스의 제조 방법에 관한 것이다.The present invention relates to a flux which is added to the molten metal during the metal casting process to remove impurities. In particular, the present invention relates to a flux of an iron emulsion powder and a wollastonite powder, which can be prepared by adding a separate composition according to the melt component. It relates to a method for producing a melt for improving flux.

일반적으로, 주조(casting)는, 용해로 등의 가열로를 통해 용융되어진 액상상태의 용탕을 주형(mold)으로 주입하여 원하는 형상으로 제조하는 금속의 성형법으로서, 이로한 주조방식에는 슬라브나 빌레트와 같은 단순형상을 주조하는 일반주조와 복잡한 형상을 주조하는 특수주조로 구분된다.In general, casting is a method of forming a metal in which a molten liquid in a molten state, which is melted through a furnace such as a melting furnace, is formed into a mold and manufactured into a desired shape. In this casting method, a slab or billet is used. It is divided into general casting casting simple shape and special casting casting complex shape.

그러나, 주조과정에서 즉, 주형에 용탕을 주입하는 과정에서 대기중의 산소나 개재물과 같은 불순물들이 결정립계로 석출되어 편석이나 기공과 같은 조직결함을 발생시키므로, 이들의 불순물을 제거하기 위한 수단으로 용탕중에 별도의 원소를 첨가하는 방법이 이용되고 있다.However, in the casting process, that is, during injection of the molten metal into the mold, impurities such as oxygen and inclusions in the atmosphere are precipitated at grain boundaries, resulting in tissue defects such as segregation and pores. The method of adding another element in the process is used.

예컨대, 철계합금의 경우, 용탕중에 탄소나 규소, 알루미늄 등의 성분을 분말상태로 첨가하여 용탕내의 탈가스(산소)처리하는 방법과, 용탕이 응고되는 과정에서 접종제(Fe-Si, Ca-Si 등)를 첨가하여 금속조직을 구성흑연화시킴으로 조직을 개선하는 방법이 이용되고 있다.For example, in the case of an iron-based alloy, carbon, silicon, aluminum, or other components are added to the molten powder in a powder form, and degassing (oxygen) treatment in the molten metal is performed. A method of improving the structure by adding Si, etc.) to make the structure of the metal structure graphite is used.

또한, 동계합금의 경우, 용탕중에 인화합물을 첨가하여 탈가스처리하는 방법이 사용되고 있다.In the case of copper alloys, a method of adding a phosphorus compound to a molten metal and degassing it is used.

그런데, 슬라브나 빌레트를 주조하는 일반주조와는 달리, 주형에 용탕을 부어 복잡한 형상을 주조하는 특수주조의 경우에는 가스나 개재물의 제거작업이 만족할 만한 수준으로 이루어지지 않아, 예컨대 결정립계에 편석이나 기공 등과 같은 조직결함이 다량 발생되므로, 최종완성품의 불량률이 증대됨은 물론, 최종제품의 단가가 증대되는 문제점이 있었다.However, unlike the general casting for casting slabs or billets, in the case of special casting for casting complex shapes by pouring molten metal in the mold, the removal of gas or inclusions is not satisfactory, such as segregation or porosity at grain boundaries. Since a large amount of tissue defects, such as, there is a problem that the defective rate of the finished product is increased, as well as the unit cost of the final product.

이에, 본 발명은 상기한 바와 같은 제문제점을 해결하기 위하여 안출된 것으로서, 주형에 용탕을 부어 복잡한 형상을 주조하는 과정에서 유화철분말과 규회석분말이 혼합되어진 첨가제에 용탕성분에 따라 별도첨가된 조성물을 통해 플럭스로 제조하여, 용탕중의 분순물을 최소화시킬 수 있도록 된 용탕개량용 플럭스의 제조방법을 제공하는 데에 그 목적이 있다.Thus, the present invention was devised to solve the problems as described above, in the process of casting a complex shape by pouring molten metal in the mold is added to the additive separately mixed according to the molten iron powder and wollastonite powder It is an object of the present invention to provide a method for producing a flux for improving the molten metal, which can be produced through the flux to minimize the impurities in the molten metal.

상기한 바의 목적을 달성하기 위한 본 발명은, 용해로에 의해 액상상태로 용해되어진 용탕을 주형으로 주입하여 원하는 형상으로 주조하는 과정에서 발생되는 각종 가스나 개재물과 같은 불순물이 결정립계로 혼입되어 조직 결함을 발생시키는 것을 방지하기 위한 용탕개량용 플럭스의 제조 방법에 있어서, 유화철분말 60∼80중량%와 규회석분말 20∼40중량%를 혼합하여 450∼600℃의 온도에서 3∼5시간 가열하여 분말상태의 첨가제를 제조하는 것을 특징으로 한다.In order to achieve the above object, the present invention relates to a defect in tissue such that various impurities such as gases or inclusions generated in a process of injecting a molten metal dissolved in a liquid state by a melting furnace into a mold and casting a desired shape are incorporated into grain boundaries. In the manufacturing method of the melt-improving flux for preventing the formation of metal, 60 to 80% by weight of iron emulsion powder and 20 to 40% by weight of wollastonite powder are mixed and heated at a temperature of 450 to 600 ° C. for 3 to 5 hours. It is characterized by producing an additive in a state.

도 1은 본 발명에 따른 금속용탕에 플럭스가 첨가되지 않은 상태의 금속조직을 도시한 현미경사진,1 is a micrograph showing a metal structure in a state in which no flux is added to the molten metal according to the present invention;

도 2는 본 발명에 따른 금속용탕에 플럭스가 첨가된 상태의 금속조직을 도시한 현미경사진,Figure 2 is a micrograph showing the metal structure of the flux is added to the molten metal according to the present invention,

도 3은 본 발명에 따른 금속용탕의 주형을 도시한 개략적인 단면도이다.3 is a schematic cross-sectional view showing the mold of the molten metal according to the present invention.

* 도면중 주요부호에 관한 부호의 설명 *Explanation of symbols on major symbols in the drawings

1 ... 유입구 2 ... 통로1 ... inlet 2 ... passage

이하, 본 발명에 따른 실시예를 첨부된 예시도면을 참고로하여 상세하게 설명하면 다음과 같다.Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 금속용탕에 플럭스가 첨가되지 않은 상태의 금속조직을 도시한 현미경사진이며, 도 2는 본 발명에 따른 금속용탕에 플럭스가 첨가된 상태의 금속조직을 도시한 현미경사진이고, 도 3은 본 발명에 따른 금속용탕의 주형을 도시한 개략적인 단면도로서, 용해로에 의해 액상상태로 용해되어진 용탕을 주형으로 주입하여 원하는 형상으로 주조하는 과정에서 발생되는 각종 가스나 개재물과 같은 불순물이 결정립계로 혼입되어 조직 결함을 발생시키는 것을 방지하기 위한 용탕개량용 플럭스의 제조 방법에 있어서, 유화철분말 60∼80중량%와 규회석분말 20∼40중량%를 혼합하여 450∼600℃의 온도에서 3∼5시간 가열하여 분말상태의 첨가제를 제조하는 것을 것을 특징으로 한다.1 is a micrograph showing a metal structure in which no flux is added to a molten metal according to the present invention, and FIG. 2 is a micrograph showing a metal structure in a state where a flux is added to a molten metal according to the present invention. FIG. 3 is a schematic cross-sectional view illustrating a mold of a molten metal according to the present invention, in which impurities such as various gases or inclusions generated in a process of injecting a molten metal dissolved in a liquid state by a melting furnace into a mold and casting a desired shape In the method for producing a molten metal flux for preventing the formation of a tissue defect by mixing into the grain boundary, 60 to 80% by weight of iron emulsion powder and 20 to 40% by weight of wollastonite powder are mixed at a temperature of 450 to 600 ° C. It is characterized by producing a powdered additive by heating for 3 to 5 hours.

먼저, 본 발명의 온탕개량제(이하, 플럭스라 함)는, 일차로 유화철분말과 규회석분말을 일정비율로 혼합하여 제조되어진 가열처리물(이하, 첨가제라 함)을 제조한 다음, 이 첨가제에 철제합금인 경우와 동계합금인 경우와 알루미늄계합금의 경우로 구별하여 제조됨은 첨언한다.First, the hot water improving agent (hereinafter, referred to as flux) of the present invention first prepares a heat treated product (hereinafter, referred to as an additive) prepared by mixing iron emulsion powder and wollastonite powder at a predetermined ratio, and then adds to this additive. It is added that it is manufactured separately from the case of iron alloy, the case of copper alloy, and the case of aluminum alloy.

한편, 첨가제를 제조하는 과정을 살펴보면, 유화철 분말 60∼80중량%와 규회석 분말 20∼40중량%를 혼합한 다음 450∼600℃의 온도를 유지하는 가열로에서 3∼5시간동안 가열하여 분말형태로 제조한다.On the other hand, looking at the process of manufacturing the additive, 60 to 80% by weight of the iron emulsion powder and 20 to 40% by weight wollastonite powder is mixed and then heated for 3 to 5 hours in a heating furnace maintaining the temperature of 450 to 600 ℃ powder Prepare in form.

이때, 유화철 분말로는 유화제1철이나 유화제2철 중 어느 것이라도 사용가능하지만, 가격이 저렴한 유화제2철이 바람직하며, 특히 용탕내에서 신속하게 반응이 이루어지도록 분말입도를 100∼200 메쉬를 유지함이 좋다.At this time, any one of ferrous emulsifier and ferric emulsifier may be used as the iron emulsion powder, but inexpensive ferric emulsifier is preferable, and in particular, maintains the particle size of 100 to 200 mesh so as to react quickly in the molten metal. This is good.

그리고, 규회석 분말로는, 칼슘이나 철이나 망간 등을 주성분으로 하는 규산염으로서, 이때 분말의 입도는 용탕내에서 신속하게 반응을 일으키도록 100∼200 메쉬의 크기로 유지함이 바람직하다.The wollastonite powder is a silicate containing calcium, iron, manganese or the like as a main component, and the particle size of the wollastonite powder is preferably maintained at a size of 100 to 200 mesh so as to rapidly react in the molten metal.

또한, 유화철분말과 규회석분말이 혼합되어진 혼합물의 가열처리온도는, 통상 400∼600℃, 바람직하게는 450℃∼600℃가 좋으며, 이때 처리온도가 너무 낮거나 높아도 반응이 불완전하게 진행된다. 이때, 가열처리시간은 가열온도와 대상, 목적에 따라 상이하나 바람직하게는 3∼5시간이 좋다.In addition, the heat treatment temperature of the mixture in which the iron emulsion powder and the wollastonite powder are mixed is usually 400 to 600 ° C, preferably 450 ° C to 600 ° C, and the reaction proceeds incompletely even if the treatment temperature is too low or too high. At this time, the heat treatment time is different depending on the heating temperature, the object and the purpose, but preferably 3 to 5 hours.

한편, 플럭스의 제조공정을 살펴보면,On the other hand, if you look at the flux manufacturing process,

첫째로, 용탕이 철계합금인 경우, 첨가제 30∼40중량%에, 철분말 25∼35 중량%와 페로망간분말 6∼10중량%와 형석분말 4∼8중량%와 탄화규소분말 8∼12중량%와 산화제2철분말 9∼13중량%를 첨가하여 제조한다.First, when the molten metal is an iron alloy, the additive is 30-40 wt%, the iron powder 25-35 wt%, the ferro-manganese powder 6-10 wt%, the fluorspar powder 4-8 wt% and the silicon carbide powder 8-12 wt%. It is prepared by adding% and ferric oxide powder 9 to 13% by weight.

둘째로, 용탕이 동계합금인 경우, 첨가제 30∼40중량%에, 동분말 15∼ 25중량%와 염화나트륨 20∼30중량%와 붕사 7∼11중량%와 페로실리콘 2∼4중량%와 페로망간 4∼6중량%와 불화나트륨 2∼4중량%를 첨가하여 제조한다.Secondly, when the molten metal is a copper alloy, 30 to 40% by weight of the additive, 15 to 25% by weight of copper powder, 20 to 30% by weight of sodium chloride, 7 to 11% by weight of borax, 2 to 4% by weight of ferro silicon and ferromanganese It is prepared by adding 4-6% by weight and 2-4% by weight of sodium fluoride.

세째로, 용탕이 알루미늄계합금인 경우, 첨가제 30∼40중량%에, 염화나트륨 25∼30중량%와 붕사 3∼7중량%와 불화나트륨 25∼30중량%와 염화칼륨 5∼9중량%를 첨가하여 제조함을 특징으로 한다.Third, when the molten metal is an aluminum alloy, 25-30% by weight of sodium chloride, 3-7% by weight of borax, 25-30% by weight of sodium fluoride and 5-9% by weight of potassium chloride are added to 30-40% by weight of the additive. It is characterized in that the manufacturing.

물론, 플럭스의 첨가량은, 금속(철,동,알루미늄)용탕 100중량%에 대하여, 대략 0.3∼ 0.5중량%로 첨가하는 것이 바람직하다. 또한, 플럭스의 첨가방법은, 플럭스를 캔형태로 성형되어진 용기에 충진하여 밀봉한 다음 용탕으로 주입하는 것이 가장 바람직하다.Of course, the addition amount of the flux is preferably added at about 0.3 to 0.5% by weight relative to 100% by weight of the molten metal (iron, copper, aluminum). In addition, in the method of adding the flux, it is most preferable that the flux is filled in a can-shaped container and sealed, and then injected into the molten metal.

이하, 실시예에 의해 설명하면 다음과 같다.Hereinafter, it demonstrates with an Example as follows.

(실시예 1)(Example 1)

먼저, 염화제2철 분말(입도 100∼200 메쉬) 80중량%와 규회석분말(입도 100∼200 메쉬) 20중량%를 혼합한 다음 400℃의 온도에서 대략 4시간동안 가열처리하여 첨가제 분말로 제조하고, 이러한 첨가제 분말에 표 1과 같은 성분을 첨가하여 주철용 플럭스로 제조하였다.First, 80% by weight of ferric chloride powder (particle size 100-200 mesh) and 20% by weight of wollastonite powder (particle size 100-200 mesh) are mixed, and then heated to a temperature of 400 ° C. for about 4 hours to prepare an additive powder. To the additive powder, the components shown in Table 1 were added to prepare a cast iron flux.

[표 1]TABLE 1

실시예 1에 의해 제조되어진 플럭스 0.4kg을 채취하여 스틸제 캔으로 충진하여 밀봉하고, 이 스틸제 캔을 주철용탕 100kg에 투입한 후, 5분의 시간이 경과된 다음 시편으로 채취하여 시편중에 잔류되어있던 잔류산소량을 측정한 결과 31PPm임을 알 수 있었다.0.4 kg of the flux prepared in Example 1 was taken, filled with a steel can, and sealed. The steel can was placed in 100 kg of cast iron molten metal. After 5 minutes had elapsed, the sample was taken and retained in the specimen. As a result of measuring the amount of residual oxygen, it was found to be 31PPm.

이때, 주철원탕(플럭스가 투입되지 않은 용탕)에 대하여도 동일한 방법으로 잔류산소량을 측정한 결과 82PPm이 잔류하고 있음을 알 수 있었다. 이때, 산소량 측정법은 적외선 흡수법을 사용하였다. 따라서, 본 발명에 의해 제조된 플럭스가 가스를 제거시키는데 효과가 있음을 알 수 있었다.At this time, as a result of measuring the residual oxygen amount in the same method for the cast iron wontang (melt without flux), it was found that 82PPm remained. At this time, the oxygen amount measurement method was an infrared absorption method. Thus, it was found that the flux produced by the present invention was effective in removing the gas.

(실시예 2)(Example 2)

실시예 1에 의해 제조되어진 플럭스 0.4kg을 스틸제 캔으로 충진하여 밀봉시킨 후, 주철용탕 100kg에 투입하고 10분의 시간이 경과된 다음, 채취하여 시편으로 제조하였다.0.4 kg of the flux prepared in Example 1 was filled and sealed with a steel can, and then charged into 100 kg of cast iron molten metal. After 10 minutes had elapsed, the sample was collected and manufactured into a specimen.

또한, 주철시편을 표면부식처리한 후 현미경으로 관찰하고, 그 결과를 도 2에 도시하였다. 이어서, 주철원탕으로부터 시편을 채취하여 동일한 방법으로 표면부식처리한 후 현미경으로 관찰한 결과를 도 1에 도시하였고, 각 시편의 기계적 성질을 조사하여 표 2에 도시하였다.In addition, the cast iron specimen was subjected to a surface corrosion treatment and observed under a microscope, the results are shown in FIG. Subsequently, the specimens were taken from the cast iron wontang and subjected to surface corrosion by the same method, and the results of the observation under a microscope are shown in FIG.

이때, 기계적 성질을 위한 시험에 사용된 주철시편은 직경 20mm 온도 23℃이며 인장시험은 JIS Z2241에 준하여 실시하였다. 또한, 경도시험은 인장시험에 이용된 시험편을 이용하여 JIS Z2243에 준하여 행하였다.At this time, the cast iron specimen used in the test for the mechanical properties is 20mm in diameter temperature 23 ℃ and the tensile test was carried out in accordance with JIS Z2241. In addition, the hardness test was performed according to JIS Z2243 using the test piece used for the tensile test.

표 2에서도 알 수 있듯이, 플럭스가 투입되어진 주철용탕시편의 기계적 성질이 그렇지 않은 주철용탕시편에 비해 조직의 균질성이 우수하여 기계적 성질이 향상되었음을 알 수 있었다.As can be seen from Table 2, it was found that the mechanical properties of the cast iron molten iron sample to which the flux was injected were improved due to the homogeneity of the tissue compared to the cast iron molten iron sample.

(실시예 3)(Example 3)

실시예 1에 의해 제조되어진 용탕의 유동성을 조사하기 위해, 1450℃의 온도에서 주철을 용융하여 플럭스 0.4kg를 투입한 후 5분의 시간이 경과된 다음 도 3의 유입구(1)와 통로(2)를 갖는 주형을 이용하여 용탕의 도착위치를 관찰하였다.In order to investigate the fluidity of the molten metal prepared in Example 1, after melting the cast iron at a temperature of 1450 ° C. and adding 0.4 kg of flux, the inlet 1 and the passage 2 of FIG. The arrival position of the molten metal was observed by using a mold having).

이때, 플럭스를 첨가한 경우 B점까지 도달한데 반하여 플럭스를 첨가하지 않는 경우 A점까지 도달하였으며, 이로인해 주철용탕에 플럭스를 첨가하는 경우 용탕의 유동성이 향상되었음을 알 수 있었다.At this time, when the flux was added to reach the point B, when the flux was not added, it reached to the point A. Thus, when the flux was added to the cast iron melt, it was found that the flowability of the melt was improved.

(실시예 4)(Example 4)

실시예 1과 같은 과정을 통해 제조되어진 첨가제 분말에, 표 3과 같은 성분을 첨가하여 동계합금의 플럭스로 제조하였다.To the additive powder prepared in the same manner as in Example 1, the components shown in Table 3 were added to prepare a flux of the copper alloy.

표 3과 같은 성분으로 제조되어진 플럭스 0.4kg를 채취하여 동제 캔(can)에 충진하여 밀봉한 후 청동용탕 100kg에 투입한 후 30분이 경과된 다음 시료를 채취하여 시편을 제작하였다.0.4 kg of the flux prepared with the ingredients as shown in Table 3 was taken, filled in a copper can, and sealed, and then placed in 100 kg of bronze molten metal.

이때, 청동시편을 실시예 2와 같은 방법으로 인장강도와 연신율을 측정한 결과, 인장강도는 26kg/㎟이었고 연신율은 32%이었으며, 특히 용탕의 유동성이 매우 양호하여 표면품질이 향상되었음을 알 수 있었다.In this case, as a result of measuring the tensile strength and elongation of bronze specimens in the same manner as in Example 2, the tensile strength was 26kg / ㎜ and elongation was 32%, in particular, it was found that the surface quality was improved because the flowability of the molten metal is very good .

또한, 동계합금(플럭스가 첨가됨)의 기계적성질을 비교하기 위해, 용탕에 탈산제(인화합물)를 첨가하여 탈산처리한 시료를 채취한 후 인장강도와 연신율을 측정한 결과, 인장강도는 23kg/㎟이고 연신율은 25%이었으며, 주물표면에 거친부분이 남아 있음을 알 수 있었다.In addition, in order to compare the mechanical properties of the copper alloy (with flux), after deoxidation treatment was performed by adding a deoxidizer (phosphorus compound) to the molten metal, the tensile strength and elongation were measured, and the tensile strength was 23 kg / The elongation was 25% and the rough part remained on the casting surface.

따라서, 본 발명의 플럭스를 동계합금에 첨가한 경우, 철제합금과 마찬가지로 기계적 성질이 향상되었음을 알 수 있었다.Therefore, it was found that when the flux of the present invention was added to the copper alloy, the mechanical properties were improved as with the iron alloy.

(실시예 5)(Example 5)

실시예 1과 같은 과정을 통해 제조되어진 첨가제 분말에, 표 4와 같은 성분을 첨가하여 알루미늄계합금의 플럭스로 제조하였다.To the additive powder prepared in the same manner as in Example 1, by adding the components shown in Table 4 to prepare a flux of aluminum-based alloy.

[표 4]TABLE 4

표 4와 같은 성분으로 제조되어진 플럭스 0.4kg을 채취하여 알루미늄 캔으로 충진하여 밀봉한 후 알루미늄 용탕 100kg에 투입하고, 30분이 경과된 다음 용탕을 채취하여 3개의 시편을 제작하였다.0.4 kg of the flux prepared with the components as shown in Table 4 was collected, filled with aluminum cans, sealed, and then put into 100 kg of aluminum molten metal. After 30 minutes, the molten metal was collected to prepare three specimens.

동시에, 플럭스가 첨가되지 않은 알루미늄 용탕의 시편을 채취하여 3개의 시편으로 제작한 다음 현미경으로 각 시편들의 잔류가스 및 기공수를 조사하였으며 그 결과를 표 5에 도시하였다. 이때, 잔류가스는 진공용융추출법에 의해 700℃에서 30분간 질량분석을 행하여 얻었다.At the same time, specimens of molten aluminum without flux were taken, prepared into three specimens, and the residual gas and pore number of each specimen were examined under a microscope, and the results are shown in Table 5. At this time, the residual gas was obtained by mass spectrometry at 700 ° C. for 30 minutes by vacuum melting extraction.

표 5에서와 같이, 알루미늄 용탕에 플럭스가 첨가된 시편은 그렇지 않은 시편에 비하여 잔류가스량이 매우 적으면서도 기공수에서도 매우 줄어 들었음을 알수 있었고, 이로인해 알루미늄 용탕이 플럭스에 의해 충분하게 탈가스처리가 행해졌음을 알 수 있었다.As shown in Table 5, it was found that the flux added to the aluminum molten metal was significantly reduced in the pore water while the amount of residual gas was much smaller than that of the non-aluminum molten aluminum. Thus, the aluminum molten metal was sufficiently degassed by the flux. It can be seen that it was done.

이상에서 설명한 바와 같이 본 발명에 따른 용탕개량용 플럭스의 제조 방법.에 의하면, 철계합금과 동계합금과 알루미늄계합금을 주조하는 과정에서 불순물의 제거작업이 원활하게 이루어지므로, 금속조직의 균질화가 이루어져 기계적 특성이 향상될 뿐만 아니라, 주물표면품질이 향상되어 주조과정에서 발생하는 제반 부대비용이 절감되는 효과가 있는 것이다.As described above, according to the method for manufacturing the flux for improving the molten metal according to the present invention, since the impurities are removed smoothly during the casting of the iron alloy, the copper alloy, and the aluminum alloy, the homogenization of the metal structure is made. Not only the mechanical properties are improved, but the casting surface quality is improved, which reduces the overall costs incurred in the casting process.

Claims

Manufacturing flux for improving molten metal to prevent impurities such as various gases or inclusions generated in the process of injecting molten metal dissolved in a liquid state by a melting furnace into a mold and casting into a desired shape to generate tissue defects In the method,

60 to 80% by weight of iron powder and 20 to 40% by weight of wollastonite powder is heated for 3 to 5 hours at a temperature of 450 to 600 ℃ to produce a powder-forming additive, characterized in that for producing a flux .

The method of claim 1, wherein when the molten metal is an iron alloy, the additive is 30-40 wt%, 25-25 wt% iron powder, 6-10 wt% ferro-manganese powder, 4-8 wt% fluorite powder, and silicon carbide powder 8 A method for producing a flux for a molten metal improver, comprising adding -12% by weight and ferric oxide powder 9-13% by weight.

The method of claim 1, wherein when the molten metal is a copper alloy, 30 to 40% by weight of the additive, 15 to 25% by weight of copper powder, 20 to 30% by weight of sodium chloride, 7 to 11% by weight of borax and 2 to 4% by weight of ferrosilicone. And 4 to 6% by weight of ferro-manganese and 2 to 4% by weight of sodium fluoride to produce a molten metal flux improving agent.

The method according to claim 1, wherein when the molten metal is an aluminum alloy, the additive is 30-40 wt%, 25-30 wt% sodium chloride, 3-7 wt% borax, 25-30 wt% sodium fluoride and 5-9 wt% potassium chloride. Method for producing a flux for melting molten metal, characterized in that the addition to prepare a molten metal.