KR20070108585A - Oxidized film removing device of thixocasting slurry - Google Patents

Oxidized film removing device of thixocasting slurry Download PDF

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Publication number
KR20070108585A
KR20070108585A KR1020060040821A KR20060040821A KR20070108585A KR 20070108585 A KR20070108585 A KR 20070108585A KR 1020060040821 A KR1020060040821 A KR 1020060040821A KR 20060040821 A KR20060040821 A KR 20060040821A KR 20070108585 A KR20070108585 A KR 20070108585A
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South Korea
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oxide film
slurry
sleeve
film removing
mold
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KR1020060040821A
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Korean (ko)
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김민수
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현대자동차주식회사
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Priority to KR1020060040821A priority Critical patent/KR20070108585A/en
Publication of KR20070108585A publication Critical patent/KR20070108585A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/007—Semi-solid pressure die casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • B22D17/10—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2007—Methods or apparatus for cleaning or lubricating moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2023—Nozzles or shot sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/30—Accessories for supplying molten metal, e.g. in rations

Abstract

An oxide film removing device for thixocasting slurry is provided to prevent oxides from being mixed in a casting by removing an oxide film formed on the surface of the slurry in a process that the slurry is injected into a mold and discharging the removed oxide film through a discharge port. An oxide film removing device for thixocasting slurry(2) comprises a plunger(4) mounted inside a sleeve(3) to transfer the slurry to a mold(6) by pressurizing the slurry, which is injected into the sleeve by a transfer unit(5), and an oxide film removing unit formed between the mold and the plunger to remove an oxide film generated on the surface of the slurry. The oxide film removing unit is an oxide film removing blade(10) which is mounted through an opening that is formed on the peripheral part of the sleeve and inclined toward the inside of the sleeve at a predetermined angle. The oxide film removing device further comprises an air blower(11) for blowing the oxide film removed by the oxide film removing unit to a discharge port(20).

Description

반용융 슬러리의 산화피막 제거장치{Oxidized film removing device of thixocasting slurry}Oxidized film removing device of thixocasting slurry

도 1은 본 발명에 따른 반용융 슬러리의 산화피막 제거장치를 나타내는 구성도,1 is a block diagram showing an oxide film removing apparatus of a semi-melt slurry according to the present invention,

도 2는 도 1의 'A-A'선 단면도,2 is a cross-sectional view taken along the line 'A-A' of FIG.

도 3은 본 발명에 따라 산화피막이 제거된 슬러리를 통해 주조한 주조품의 내부 결정을 나타내는 도면,3 is a view showing the internal crystal of the cast product cast through the slurry in which the oxide film is removed according to the present invention,

도 4는 슬러리가 슬리브를 통해 금형으로 주입되는 과정에서의 산화막 및 기공발생을 보이는 도면,4 is a view showing the oxide film and pore generation in the process of the slurry is injected into the mold through the sleeve,

도 5는 산화막 및 기공이 발생된 주조품의 내부 결정을 나타내는 도면이다.5 is a view showing internal crystals of a cast product in which oxide films and pores are generated.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10 : 산화막제거날 11 : 에어 블로워10: oxide film removing blade 11: air blower

20 : 배출구20 outlet

본 발명은 반용융 슬러리의 산화피막 제거장치에 관한 것으로서, 더욱 상세하게는 반용융 다이캐스팅 주조 공정에 발생하는 산화막 및 기공의 혼입을 방지하기 위하여 슬러리를 제조 후에 다이캐스팅 머신까지 상기 슬러리를 이송하는데 있어 발생 가능한 슬러리 내의 산화 피막을 제거할 수 있는 반용융 슬러리의 산화피막 제거장치에 관한 것이다.The present invention relates to an apparatus for removing an oxide film of a semi-melt slurry, and more particularly, in order to prevent the mixing of oxide film and pores occurring in a semi-melt die casting casting process, the slurry is produced after the slurry is manufactured and transferred to the die casting machine. An oxide film removing apparatus of a semi-melt slurry capable of removing an oxide film in a slurry possible.

일반적으로, 사형주조, 중력주조, 다이캐스팅 주조법 등의 연구가 활발히 진행중에 있으며, 특히 반용융 슬러리를 주입하여 사출하는 레오포밍 주조법은 기존의 주조법에 비해 기공 및 수축공 등의 결함을 현저히 줄일 수 있는 장점이 있다.In general, researches on sand casting, gravity casting, and die casting casting are being actively conducted. In particular, the Leoforming casting method injecting a semi-melt slurry can significantly reduce defects such as pores and shrinkage holes compared to conventional casting methods. There is an advantage.

상기 레오포밍 주조법에서, 틱소트로픽 성향을 띠는 재료들은 전단응력이 주어졌을 때 액상과 같이 흐르며, 반대의 힘이 주어졌을 때에는 다시 용융되는(Thicken up) 경향이 있다. In the leopard casting process, thixotropic materials tend to flow as a liquid when a shear stress is given, and tend to thicken up when an opposite force is given.

이들의 점도는 전단율과 시간에 의존적이어서 완전히 액상인 재료를 고액공존 영역인(세미솔리드상태)까지 온도를 떨어뜨리며 연속적으로 교반 해줄 경우, 재료의 점도는 교반 과정을 생략한 재료와 비교하여 볼 때, 괄목할 만큼 점성이 저하된다.Their viscosity is dependent on shear rate and time, so that when the fully liquid material is continuously stirred while dropping the temperature to the solid-liquid coexistence area (semi-solid state), the viscosity of the material is lower than that of the material without the stirring process. At that time, the viscosity is remarkably low.

또한, 강력한 교반 공정을 통해 응고시 생성되는 수지상 가지를 파괴시켜 입자를 미세하게 할 수 있는 바, 이때 고액공존 영역에서의 미세조직은 액상과 액상에 둘러싸인 구형의 고상들로 이루어져 있다. In addition, it is possible to make the particles fine by breaking the dendritic branches produced during solidification through a strong stirring process, wherein the microstructure in the solid-liquid coexistence region consists of a liquid phase and spherical solid phases surrounded by the liquid phase.

이러한 미세조직을 형성하는 과정은 세미솔리드 공정과 틱소트로픽 거동을 위해 필수적인 과정인 바, 세미솔리드가 스스로를 지탱할 수 있을 때, 구형입자들은 응집되고, 따라서 점도는 시간에 따라 증가하게 된다.The process of forming such a microstructure is an essential process for the semisolid process and thixotropic behavior. When the semisolid can support itself, the spherical particles aggregate, and thus the viscosity increases with time.

고상율 30% ~ 50%인 세미솔리드 상태에서 재료가 스스로의 무게를 지탱할 수 있다면 고체를 다루는 것처럼 재료를 다루기가 상당히 쉬워지나, 만일 재료가 전단응력을 받게되면, 응집된 입자들은 깨어지면서 점도가 저하된다.If the material can support its own weight in a semi-solid state with a solid content of 30% to 50%, it is much easier to handle the material as it does for solids, but if the material is subjected to shear stress, the agglomerated particles break and become viscous. Degrades.

이것이 세미솔리드 공정에서 이용하려는 슬러리의 성질로서, 상기 세미솔리드 공정은 군사 항공 그리고 가장 괄목하게 자동차 부품생산을 위해 경쟁적으로 개발되고 있다. This is the nature of the slurry to be used in the semisolid process, which is being developed competitively for military aviation and, most notably, for automotive parts production.

유럽에서는 자동차의 서스펜션 부품, 엔진 브라켓 및 연료바디(fuel rail)등이 생산되며 미국에서는 산악자전거용 또는 스노우모빌 등의 고강도 부품소재로 개발되고 있다. In Europe, suspension parts for automobiles, engine brackets and fuel rails are produced. In the United States, high-strength parts such as mountain bikes or snowmobiles are developed.

아시아 지역에서는 전자소재부품의 생산에 집중이 되어있으며, 특히 노트북 케이스나 전자제품의 케이스에 대해 마그네슘합금 틱소포밍공정을 이용하고 있다.In Asia, the company is focusing on the production of electronic parts, and in particular, the magnesium alloy thixofoaming process is used for notebook cases and electronics cases.

이러한 세미솔리드를 이용한 레오포밍 주조 공정시, 도 4에 도시된 바와 같이, 다이캐스팅 머신(1)의 슬리브(3)를 이용하여 슬러리(2)를 금형으로 이송시키는 공정에서, 판재 형태의 이송장치(5)가 상기 다이캐스팅 머신(1)의 슬리브(3)로 슬러리(2)를 이송하는 바, 상기 이송장치(5)의 중심부가 열리면서 슬러리(2)가 슬리브(3)로 투입된다.In the process of forming a leopard using the semi-solid, as shown in FIG. 4, in the process of transferring the slurry 2 to the mold by using the sleeve 3 of the die casting machine 1, a sheet-shaped conveying apparatus ( 5) transfers the slurry 2 to the sleeve 3 of the die casting machine 1, whereby the center of the transfer device 5 is opened and the slurry 2 is introduced into the sleeve 3.

그런데, 이러한 과정에서 슬리브(3)의 벽에 슬러리(2)가 충돌하여, 이 충격에 의해 슬러리(2)의 파손이 발생하게 되며, 이로써 산화막이나 기공이 슬러리(2) 에 혼입되어 최종적으로 제조완료되는 주조품에 결함이 발생하는 문제점이 있다.However, in this process, the slurry 2 collides with the wall of the sleeve 3, and the impact of the slurry 2 is caused by the impact, whereby an oxide film or pores are mixed into the slurry 2 and finally manufactured. There is a problem that a defect occurs in the finished casting.

따라서, 본 발명은 상기와 같은 문제점을 해결하기 위해 발명한 것으로서, 슬러리가 슬리브를 통해 금형으로 주입되는 과정에서 슬리브의 내부 둘레면에 산화막제거날을 장착하여 슬러리의 둘레면에 발생할 수 있는 산화피막을 얇게 벗겨내듯이 제거하고, 이 제거된 산화피막을 에어 블로워를 통해 배출구로 배출함으로써, 금형으로 이송되어 주조되는 슬러리의 품질을 한차원 높여 주조품 내의 산화물 혼입 결함을 줄일 수 있는 반용융 슬러리의 산화피막 제거장치를 제공하는데 그 목적이 있다.Therefore, the present invention has been invented to solve the above problems, the oxide film which may occur on the peripheral surface of the slurry by mounting the oxide film removal blade on the inner peripheral surface of the sleeve during the slurry is injected into the mold through the sleeve By removing the oxide film thinly and discharging the removed oxide film through the air blower through the air blower to remove the oxide film of the semi-molten slurry, which can improve the quality of the slurry that is transferred to the mold and reduce the defect of oxide mixing in the casting. The purpose is to provide a device.

이하, 상기와 같은 목적을 달성하기 위한 본 발명의 특징에 대해 설명하면 다음과 같다. Hereinafter, the features of the present invention for achieving the above object are as follows.

본 발명에 따른 반용융 슬러리의 산화피막 제거장치는, 이송장치를 통해 슬리브에 투입된 슬러리를 금형으로 이송되도록 가압시키는 가압수단이 슬리브 내에 장착되어 있으며, 상기 금형과 가압수단 사이에는 투입되어 가압되는 반용융 슬러리의 둘레면에서 발생되는 산화막을 제거하기 위한 산화막제거수단이 형성된 것을 특징으로 한다. In the anti-melt slurry removal apparatus according to the present invention, the pressurizing means for pressurizing the slurry injected into the sleeve through the transfer apparatus to be transferred to the mold is mounted in the sleeve, and is inserted and pressed between the mold and the pressurizing means. An oxide film removing means for removing the oxide film generated on the circumferential surface of the molten slurry is formed.

특히, 상기 산화막제거수단은 슬리브 둘레부의 일정 간격만큼 형성된 틈을 통해 장착되며, 그 틈에 대해 상기 슬러리가 진행하는 방향쪽에 슬리브의 내측방향으로 일정각도 만큼 인입된 산화막제거날인 것을 특징으로 한다.In particular, the oxide film removing means is mounted through a gap formed by a predetermined distance around the sleeve portion, characterized in that the oxide film removal blade inserted in the direction of the inner side of the sleeve by a certain angle in the direction in which the slurry proceeds with respect to the gap.

또한, 상기 산화막제거수단에 의해 제거되는 산화피막을 배출구로 날려보낼 수 있도록 된 에어 블로워를 더 포함하는 것을 특징으로 한다.In addition, it characterized in that it further comprises an air blower which can blow the oxide film removed by the oxide film removing means to the outlet.

그리고, 상기 산화막제거날은 상기 슬리브에 대해 그 인입되는 간격을 아래쪽은 작게, 위쪽은 상대적으로 크게 설정하는 것을 특징으로 한다. In addition, the oxide film removing blade is characterized in that the gap is set to the lower side, the relatively large upper side relative to the sleeve.

이하, 첨부도면을 참조하여 본 발명의 구성에 대해 상세하게 설명하면 다음과 같다. Hereinafter, the configuration of the present invention with reference to the accompanying drawings in detail.

첨부한 도 1은 본 발명에 따른 반용융 슬러리의 산화피막 제거장치를 나타내는 구성도이고, 도 2는 도 1의 'A-A'선 단면도이며, 도 3은 본 발명에 따라 산화피막이 제거된 슬러리를 통해 주조한 주조품의 내부 결정을 나타내는 도면이다. 1 is a block diagram showing an oxide film removing apparatus of the semi-melt slurry according to the present invention, Figure 2 is a cross-sectional view taken along the line 'A-A' of Figure 1, Figure 3 is a slurry in which the oxide film is removed in accordance with the present invention It is a figure which shows the internal crystal | crystallization of the cast goods casted through the.

본 발명은 반용융 슬러리(2)를 제조한 후, 다이캐스팅 머신(1)을 통해 주조되는 레오포밍 주조법에 있어서, 상기 슬러리(2)를 슬리브(3) 내에 주입하는 과정에서 발생하는 산화막의 발생 및 기포 발생을 제거하기 위한 제거장치에 관한 것으로서, 도 1에 도시된 바와 같이, 이송장치(5)를 통해 슬리브(3)에 투입된 슬러리(2)를 금형(6)으로 이송되도록 가압시키는 가압수단인 플런저(4)가 슬리브(3) 내에 장착되어 있으며, 상기 금형(6)과 플런저(4) 사이에는 그 투입되어 가압되는 반용융 슬러리(2)의 둘레면에서 발생되는 산화막을 제거하기 위한 산화막제거수단이 형성되어 있다. According to the present invention, after the semi-molten slurry (2) is manufactured, the oxide film generated in the process of injecting the slurry (2) into the sleeve (3) in the Leoforming casting method cast through the die casting machine (1) and As the removal device for removing the bubble generation, as shown in Figure 1, the pressure means for pressurizing the slurry (2) injected into the sleeve 3 through the transfer device 5 to be transferred to the mold (6) A plunger 4 is mounted in the sleeve 3, and an oxide film is removed to remove an oxide film generated on the circumferential surface of the semi-molten slurry 2 that is injected and pressurized between the mold 6 and the plunger 4. Means are formed.

상기 산화막 제거수단은 상기 금형(6)으로 반용융 슬러리(2)가 투입되기 바 로 전의 슬리브(3)에 형성되어 있어 산화막을 제거한 상태의 반용융 슬러리(2)만 금형(6)으로 바로 투입될 수 있도록 하는 기능을 하게 된다. The oxide film removing means is formed in the sleeve 3 immediately before the semi-molten slurry 2 is introduced into the mold 6 so that only the semi-molten slurry 2 with the oxide film removed therein is directly introduced into the mold 6. It will be a function to make it possible.

상기 산화막 제거수단은 도 2에 도시된 바와 같이, 상기 슬리브(3)의 둘레부에 형성되어 있는 바, 그 둘레부의 일정 간격만큼 형성된 틈을 통해 장착되며, 그 틈에 대해 상기 슬러리(2)가 진행하는 방향쪽에 산화막제거날(10)이 장착되어 있다.As shown in FIG. 2, the oxide film removing unit is formed at a circumference of the sleeve 3, and is mounted through a gap formed at a predetermined distance from the circumference thereof. The oxide film removing blade 10 is attached to the advancing direction.

상기 산화막제거날(10)은 그 슬리브(3)의 내측방향으로 일정각도 만큼 인입된 상태로 약 0.1 ~ 0.5mm의 산화막을 벗겨낼 수 있도록 되어 있다.The oxide film removing blade 10 is capable of peeling off an oxide film of about 0.1 to 0.5 mm in a state of being drawn by a predetermined angle in the inward direction of the sleeve 3.

이때, 상기 슬리브(3)를 통과하는 반용융 슬러리(2)가 중력으로 인하여 약간 아래방향으로 처지게 되므로 상기 슬리브(3)에 대해 산화막제거날(10)의 인입되는 간격을 아래쪽은 작게, 위쪽은 크게 설정하는 것이 바람직하다. At this time, since the semi-melt slurry 2 passing through the sleeve 3 sags downward due to gravity, the interval between the oxide removing blades 10 is drawn downward with respect to the sleeve 3 is small. It is preferable to set large.

이와 같이 구성된 상기 산화막제거날(10)의 전방에 위치한 틈으로 반용융 슬러리(2)의 산화피막이 벗겨진 상태에서 배출되는 바, 에어 블로워(air blower)(11)를 그 전방에 장착하여 산화막제거날(10)에 의해 제거되는 산화피막이 상기 틈에 위치한 배출구(20)를 통해 배출될 수 있도록 되어 있다.A bar disposed in front of the oxide removal blade 10 configured as described above is discharged while the oxide film of the semi-melt slurry 2 is peeled off, and an air blower 11 is mounted in front of the oxide removal blade. The oxide film removed by 10 can be discharged through the outlet 20 located in the gap.

이와 같이 반용융 슬러리(2)를 제조한 후, 다이캐스팅 머신(1)을 통해 주조되는 레오포밍 주조법에 있어서, 다이캐스팅 머신(1)에 장착된 금형(6)에 반용융 슬러리(2)를 이송시키기 전에 플런저(4)를 통해 슬리브(3)를 통과하는 동안 산화막제거날(10)을 통해 산화피막을 제거함으로써, 금형(6)으로 이송되어 주조되는 슬러리(2)의 품질을 한차원 높여 주조품 내의 산화물 및 기포의 혼입 결함을 줄일 수 있게 된다. After the semi-molten slurry 2 is manufactured in this manner, in the leoforming casting method cast through the die casting machine 1, the semi-melt slurry 2 is transferred to a mold 6 mounted on the die casting machine 1. By removing the oxide film through the oxide removal blade 10 while previously passing through the sleeve 3 through the plunger 4, the quality of the slurry 2 which is transferred to the mold 6 and cast is further enhanced. And it is possible to reduce the mixing defect of bubbles.

상술한 바와 같이, 본 발명에 따른 반용융 슬러리의 산화피막 제거장치에 의하면, 금형으로 이송되어 주조되는 슬러리의 품질을 한차원 높여 주조품 내의 산화물 혼입 결함을 줄일 수 있는 효과가 있다. As described above, according to the present invention, the oxide film removing apparatus of the semi-molten slurry has an effect of reducing oxide mixing defects in the cast by raising the quality of the slurry to be cast and cast into a mold.

Claims (4)

이송장치를 통해 슬리브에 투입된 슬러리를 금형으로 이송되도록 가압시키는 가압수단이 슬리브 내에 장착되어 있으며, 상기 금형과 가압수단 사이에는 그 투입되어 가압되는 반용융 슬러리의 둘레면에서 발생되는 산화막을 제거하기 위한 산화막제거수단이 형성된 것을 특징으로 하는 반용융 슬러리의 산화피막 제거장치.Pressing means for pressurizing the slurry injected into the sleeve through the transfer device to the mold is mounted in the sleeve, and between the mold and the pressing means for removing the oxide film generated on the circumferential surface of the semi-molten slurry is injected and pressurized An oxide film removing device of a semi-molten slurry, characterized in that the oxide film removing means is formed. 청구항 1에 있어서,The method according to claim 1, 상기 산화막제거수단은 슬리브 둘레부의 일정 간격만큼 형성된 틈을 통해 장착되며, 그 틈에 대해 상기 슬러리가 진행하는 방향쪽에 슬리브의 내측방향으로 일정각도 만큼 인입된 산화막제거날인 것을 특징으로 하는 반용융 슬러리의 산화피막 제거장치.The oxide film removing means is mounted through a gap formed by a predetermined gap around the sleeve, the oxide removal blade, characterized in that the oxide film removal blades inserted by a predetermined angle in the inner direction of the sleeve toward the direction in which the slurry proceeds with respect to the gap Anod removal device. 청구항 1 또는 청구항 2에 있어서,The method according to claim 1 or 2, 상기 산화막제거수단에 의해 제거되는 산화피막을 배출구로 날려보낼 수 있도록 된 에어 블로워를 더 포함하는 것을 특징으로 하는 반용융 슬러리의 산화피막 제거장치.And an air blower capable of blowing the oxide film removed by the oxide film removing means to an outlet. 청구항 2에 있어서,The method according to claim 2, 상기 산화막제거날은 상기 슬리브에 대해 그 인입되는 간격을 아래쪽은 작게, 위쪽은 상대적으로 크게 설정하는 것을 특징으로 하는 반용융 슬러리의 산화피막 제거장치.The oxide film removing blade is an oxide film removing device of the semi-molten slurry, characterized in that for setting the spacing of the drawn relative to the sleeve to a smaller downward, the upper relatively.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150375296A1 (en) * 2012-03-22 2015-12-31 Apple Inc. Methods and systems for skull trapping

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150375296A1 (en) * 2012-03-22 2015-12-31 Apple Inc. Methods and systems for skull trapping
US9975171B2 (en) * 2012-03-22 2018-05-22 Apple Inc. Methods and systems for skull trapping

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