KR20060072562A - Apparatus for continuous casting of magnesium billet or slab using low frequency electromagnetic field and the method thereof - Google Patents

Apparatus for continuous casting of magnesium billet or slab using low frequency electromagnetic field and the method thereof Download PDF

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KR20060072562A
KR20060072562A KR1020040111236A KR20040111236A KR20060072562A KR 20060072562 A KR20060072562 A KR 20060072562A KR 1020040111236 A KR1020040111236 A KR 1020040111236A KR 20040111236 A KR20040111236 A KR 20040111236A KR 20060072562 A KR20060072562 A KR 20060072562A
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South Korea
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low frequency
continuous casting
electromagnetic field
mold
magnesium
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KR1020040111236A
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Korean (ko)
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KR100721874B1 (en
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박준표
이규창
윤우석
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재단법인 포항산업과학연구원
재단법인 전라남도신소재산업진흥재단
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Priority to KR1020040111236A priority Critical patent/KR100721874B1/en
Priority to EP05821971A priority patent/EP1833628A4/en
Priority to PCT/KR2005/004438 priority patent/WO2006068424A1/en
Priority to US11/722,783 priority patent/US20080179038A1/en
Priority to JP2007548075A priority patent/JP2008525197A/en
Priority to CNA2005800473235A priority patent/CN101111333A/en
Publication of KR20060072562A publication Critical patent/KR20060072562A/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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/049—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for direct chill casting, e.g. electromagnetic casting
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/04—Casting aluminium or magnesium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

본 발명은 저주파 전자기장을 이용하여 마그네슘의 작은 응고 잠열을 보상하고 응고 속도를 제어할 수 있도록 하며 몰드 내 용탕을 교반하여 연속 주조를 가능하게 하기 위하여, 그 내부에서 마그네슘의 주편을 연속주조하는 몰드와 상기 몰드의 외부에 설치된 저주파 전류 인가용 코일과 상기 몰드의 외부 및 상기 주편의 외부에 설치된 냉각노즐로 구성된 것을 특징으로 하는 저주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조장치를 제공한다.The present invention uses a low frequency electromagnetic field to compensate for the latent heat of solidification of magnesium and to control the solidification rate and to enable continuous casting by stirring the molten metal in the mold, and the continuous casting mold of magnesium therein; Provided is a magnesium billet or slab continuous casting device using a low frequency electromagnetic field, characterized in that consisting of a low frequency current applying coil provided on the outside of the mold and a cooling nozzle provided on the outside of the mold and the outside of the cast.

저주파, 전자기장, 마그네슘, 연속주조Low frequency, electromagnetic field, magnesium, continuous casting

Description

저주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조장치 및 제조방법{Apparatus for continuous casting of Magnesium billet or slab using low frequency electromagnetic field and the method thereof}Apparatus for continuous casting of Magnesium billet or slab using low frequency electromagnetic field and the method

도 1은 본 발명의 개념도1 is a conceptual diagram of the present invention

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1 : 몰드 2 : 전자기장 인가 코일1: mold 2: electromagnetic field applying coil

3 : 링 4 : 주편3: ring 4: cast

5 : 용탕 6 : 냉각노즐5: molten metal 6: cooling nozzle

본 발명은 저주파 전자기장을 이용하여 마그네슘의 작은 응고 잠열을 보상하고 응고 속도를 제어할 수 있도록 하여 연속 주조를 가능하게 하는 기술로, 마그네슘을 연속 주조할 때, 저주파 전자기장을 인가하여 용탕을 가열하여 작은 응고잠열을 보상하고 응고 속도를 제어할 수 있게 하며 몰드 하부에 저주파 전자기 교반장치를 인가하여 표면 결함이 없는 주편을 고속으로 생산하고 내부품질을 높이는 것에 관한 것이다.The present invention enables continuous casting by compensating small latent heat of magnesium and controlling the rate of solidification by using a low frequency electromagnetic field. When continuous casting of magnesium, a low frequency electromagnetic field is applied to heat a molten metal and Compensation for latent heat of solidification, controlling the rate of solidification, and applying a low frequency electromagnetic stirring device to the bottom of the mold is to produce casts without surface defects at high speed and to improve internal quality.

마그네슘 합금은 높은 비강도, 우수한 전자파 차폐성, 방열특성 및 진동 감쇠능 등의 우수한 물리적 특성을 갖고 있어 경량 금속으로 수송기기의 경량화 부품 및 전자 정보통신용 부품으로 널리 사용되고 있다. 마그네슘은 응고 잠열이 매우 작아 주조시에 급속하게 응고되어 일반적인 연속주조 방법으로는 주조가 곤란한 실정이다. Magnesium alloys have high physical strength such as high specific strength, excellent electromagnetic shielding, heat dissipation and vibration damping ability, and are widely used as lightweight metal parts for transportation equipment and electronic information communication components. Magnesium has a very small latent heat of solidification and rapidly solidifies during casting, making casting difficult in general continuous casting methods.

마그네슘은 다이케스팅법으로 제품을 주로 제조하고 있으며 연속 주조와 관련된 특허 및 보고는 없는 실정이며 일부 쌍롤 연속주조법으로 판재를 생산하고 있다. Magnesium is mainly manufactured by die casting method, and there are no patents and reports related to continuous casting and some plates are produced by continuous casting method.

마그네슘 합금은 작은 응고잠열로 인하여 주조시에 급속 응고되기 때문에 이에 따른 각종 결함이 발생하여 연속 주조하기가 곤란한 합금이다. 연속주조를 하기 위해서는 냉각을 매우 작게 하여야 하기 때문에 주조 속도를 높이는데 한계가 있다.Magnesium alloys are alloys which are difficult to continuously cast due to various defects resulting from rapid solidification during casting due to latent solidification heat. There is a limit to increase the casting speed because the cooling must be very small in order to continuously cast.

마그네슘 빌렛 연속 주조 기술은 오스트리아의 LKR에서 MAGCAST라는 기술을 개발하였다. 이 기술은 알루미늄 연속 주조에 이용하던 기존의 DC(direct chill casting)법을 개조하여 마그네슘 빌렛을 연속 주조하는 기술로 주조한 주편의 표면에는 많은 결함이 발생하여 이를 제거하기 위하여 표면을 스카핑 는 공정이 필요하며 주조속도도 매우 낮다.Magnesium billet continuous casting technology has developed a technology called MAGCAST in LKR, Austria. This technique is a technique of continuous casting of magnesium billet by modifying the conventional direct chill casting method used for continuous casting of aluminum. Is required and the casting speed is very low.

또한 수평 연속 주조법으로 마그네슘 빌렛을 생산하는 기술이 있으나 주편에 표면 결함이 다량으로 발생하며 주조속도도 매우 낮다.In addition, there is a technology for producing magnesium billet by the horizontal continuous casting method, but a large amount of surface defects in the cast steel and casting speed is very low.

본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위하여 창안된 것으로서, 마그네슘 주조시에 저주파 전자기장을 이용하는 기술로서 전기 전도도가 양호한 동 또는 동합금으로 제조된 몰드와 몰드 외부에 전자기장을 인가할 수 있는 코일을 설치하여 전자기장으로 마그네슘 용탕을 유도가열하고 저주파 전자기 특성으로 용탕을 교반시켜 연속주조가 가능하게 하고 주조시에 발생하는 각종 표면 결함을 해소함과 동시에 주조 속도를 증가시키며 내부 조직을 등축정화시켜 각종 내부 결함을 줄이고 생산성을 향상시킬 수 있는 연속주조 기술과 설비를 확보하는 것이 목적이다. The present invention has been made to solve the above problems of the prior art, a technique using a low frequency electromagnetic field during magnesium casting, a coil made of copper or copper alloy having good electrical conductivity and a coil capable of applying the electromagnetic field to the outside of the mold Induction heating of magnesium molten metal by electromagnetic field, continuous melting by stirring the molten metal with low frequency electromagnetic characteristics, eliminating various surface defects generated during casting, increasing casting speed and equiaxing internal structure The goal is to have continuous casting technology and facilities that can reduce defects and improve productivity.

상술한 기술적 과제를 달성하기 위하여 그 내부에서 마그네슘의 주편을 연속주조하는 몰드와 상기 몰드의 외부에 설치된 저주파 전류 인가용 코일과 상기 몰드의 외부 및 상기 주편의 외부에 설치된 냉각노즐로 구성된 것을 특징으로 하는 저주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조장치를 제공한다.In order to achieve the above technical problem, it is characterized by consisting of a mold for continuously casting a cast of magnesium in the interior, a low frequency current applying coil provided on the outside of the mold and a cooling nozzle provided on the outside of the mold and the outside of the cast. It provides a magnesium billet or slab continuous casting device using a low frequency electromagnetic field.

또한, 본 발명은 상기 몰드는 내면 상부에 교체가능한 링이 설치된 것을 특징으로 하는 저주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조장치를 제공한다.In another aspect, the present invention provides a magnesium billet or slab continuous casting device using a low-frequency electromagnetic field, characterized in that the replaceable ring is installed on the upper surface of the mold.

또한, 본 발명은 상기 링은 재질인 흑연인 것을 특징으로 하는 저주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조장치를 제공한다.In addition, the present invention provides a magnesium billet or slab continuous casting apparatus using a low-frequency electromagnetic field, characterized in that the ring is made of graphite.

또한, 본 발명은 상기 장치를 이용하여 저주파 전류 인가용 코일에는 주파수 2~1,000Hz의 전류를 인가하는 것을 특징으로 하는 저주파 전자기장을 이용한 마 그네슘 빌렛 또는 슬래브 연속주조방법을 제공한다.In addition, the present invention provides a magnesium billet or slab continuous casting method using a low frequency electromagnetic field, characterized in that to apply a current of a frequency of 2 ~ 1,000Hz to the low frequency current applying coil using the above device.

이하, 도면을 참조하여 본 발명의 구성 및 작용을 설명한다.Hereinafter, the configuration and operation of the present invention with reference to the drawings.

우선, 본 발명에 적용된 새로운 전자기연속주조기술의 원리를 설명한다. 도 1은 본 발명의 개념도이며 용탕(5)의 응고를 위한 몰드(1)와 몰드(1)의 외부에 저주파 전자기장을 인가하기 위한 코일(2), 상기 몰드(1)의 상부 내면에 설치된 용탕의 응고를 제어하고 주조를 원활히 하기 위한 링(3), 주편(4) 및 몰드(1)를 냉각시키기 위한 냉각수 분사 노즐(6)로 구성된다.First, the principle of the new electromagnetic continuous casting technique applied to the present invention will be described. 1 is a conceptual view of the present invention, the mold 1 for solidifying the molten metal 5 and the coil 2 for applying a low frequency electromagnetic field to the outside of the mold 1, the molten metal installed on the upper inner surface of the mold 1 And a coolant spray nozzle 6 for cooling the ring 3, the cast steel 4 and the mold 1 for controlling the solidification of the mold and for smooth casting.

상기 코일(3)에 저주파 전류를 인가하면 전기전도도가 양호한 금속으로 된 몰드를 통하여 몰드 내부의 마그네슘 용탕(5)에 유도 자장과 전류를 발생된다. 유도된 전류는 용탕을 가열(Joule heating)할 뿐 아니라 자장과 작용하여 용융금속에 전자기력을 발생시킨다. 가열(Joule heating)에 의해 용융 금속이 가열되어 초기응고셀 부분에서 냉각수에 의한 냉각효과를 줄여 안정적으로 응고가 될 수 있게 된다. 또한 용탕 내에 발생하는 전자기력은 용탕 표면부가 크고 내부가 작게 되어 전자기력의 구배로 인해 용탕이 교반 되어 주편의 내부 조직이 개선된다.When a low frequency current is applied to the coil 3, an induced magnetic field and a current are generated in the molten magnesium 5 inside the mold through a mold made of a metal having good electrical conductivity. The induced current not only heats the molten metal, but also acts as a magnetic field to generate electromagnetic force in the molten metal. The molten metal is heated by Joule heating to reduce the cooling effect of the cooling water by the cooling water in the initial solidification cell, thereby stably solidifying. In addition, the electromagnetic force generated in the melt has a large surface area of the melt and the inside thereof is small, and the internal structure of the cast steel is improved by stirring the melt due to the gradient of the electromagnetic force.

상기 몰드(1)의 재질은 전기전도도가 양호한 알루미늄 또는 동 합금으로 될 수 있다. 주편의 냉각을 지연시키고 주편이 잘 주조되도록 윤활효과를 주기 위하여 흑연으로 된 링(3)을 삽입할 수 있다. 링(3)의 길이는 몰드 상부에서 탕면 하부20mm 까지이며 두께는 2mm 이상으로 한다. 또한 링(3)은 손상된 경우 교체가 가능하다.The material of the mold 1 may be made of aluminum or copper alloy having good electrical conductivity. A ring of graphite 3 may be inserted to delay the cooling of the cast and to lubricate the cast. The length of the ring 3 is from the top of the mold to the bottom of the bottom surface 20 mm and the thickness is 2 mm or more. The ring 3 is also replaceable if damaged.

저주파 전자기장의 주파수는 2Hz에서 1000Hz 사이로 하며 주편의 크기에 따 라 결정된다. 전류의 세기도 주편의 크기 및 주조속도에 따라 결정된다.The frequency of the low frequency electromagnetic field is between 2 Hz and 1000 Hz and depends on the size of the cast. The strength of the current also depends on the size of the cast and the casting speed.

몰드 및 주편 냉각은 냉각수 스프레이 노즐(4)을 통해 직접 살수로 이루어진다. 냉각수는 몰드(1), 몰드 내부의 링(3), 전자기장 인가 코일(2)을 동시에 냉각한다.Mold and cast cooling consists of watering directly through the coolant spray nozzle 4. The cooling water simultaneously cools the mold 1, the ring 3 inside the mold, and the electromagnetic field applying coil 2.

본 발명으로, 마그네슘 및 마그네슘 합금 주조시에 본 발명에서 고안한 장치를 이용하여 주편의 표면 결함이 없는 주편을 주조할 수 있으며 주조 속도도 증가할 수 있고 내부 품질도 향상할 수 있는 효과를 얻을 수 있다.According to the present invention, when casting magnesium and magnesium alloy, it is possible to cast the cast without surface defects of the cast using the apparatus devised in the present invention, and the casting speed can be increased and the internal quality can also be improved. have.

Claims (4)

그 내부에서 마그네슘의 주편을 연속주조하는 몰드와A mold that continuously casts magnesium slabs inside 상기 몰드의 외부에 설치된 저주파 전류 인가용 코일과A low frequency current applying coil installed outside the mold; 상기 몰드의 외부 및 상기 주편의 외부에 설치된 냉각노즐로Cooling nozzles provided on the outside of the mold and the outside of the cast 구성된 것을 특징으로 하는 저주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조장치.Magnesium billet or slab continuous casting apparatus using a low frequency electromagnetic field characterized in that the configuration. 청구항 1에 있어서,The method according to claim 1, 상기 몰드는 내면 상부에 교체가능한 링이 설치된 것을 특징으로 하는 저주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조장치.The mold is a magnesium billet or slab continuous casting device using a low frequency electromagnetic field, characterized in that the replaceable ring is installed on the upper inner surface. 청구항 2 에 있어서,The method according to claim 2, 상기 링은 재질인 흑연인 것을 특징으로 하는 저주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조장치.Magnesium billet or slab continuous casting device using a low-frequency electromagnetic field, characterized in that the ring is made of graphite material. 청구항 1 또는 3의 어느 한 항의 장치에 있어서,The apparatus of any one of claims 1 or 3, 상기 저주파 전류 인가용 코일에는 주파수 2~1,000Hz의 전류를 인가하는 것을 특징으로 하는 저주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조방법.Magnesium billet or slab continuous casting method using a low frequency electromagnetic field, characterized in that for applying the current of the frequency of 2 ~ 1,000Hz to the low frequency current application coil.
KR1020040111236A 2004-12-23 2004-12-23 Apparatus for continuous casting of Magnesium billet or slab using low frequency electromagnetic field KR100721874B1 (en)

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KR1020040111236A KR100721874B1 (en) 2004-12-23 2004-12-23 Apparatus for continuous casting of Magnesium billet or slab using low frequency electromagnetic field
EP05821971A EP1833628A4 (en) 2004-12-23 2005-12-22 Apparatus for continuous casting of magnesium billet or slab using electromagnetic field and the method thereof
PCT/KR2005/004438 WO2006068424A1 (en) 2004-12-23 2005-12-22 Apparatus for continuous casting of magnesium billet or slab using electromagnetic field and the method thereof
US11/722,783 US20080179038A1 (en) 2004-12-23 2005-12-22 Apparatus For Continuous Casting of Magnesium Billet or Slab Using Electromagnetic Field and the Method Thereof
JP2007548075A JP2008525197A (en) 2004-12-23 2005-12-22 Magnesium billet or slab continuous casting apparatus using electromagnetic field and manufacturing method
CNA2005800473235A CN101111333A (en) 2004-12-23 2005-12-22 Apparatus for continuous casting of magnesium billet or slab using electromagnetic field and the method thereof

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KR101050798B1 (en) * 2008-12-19 2011-07-21 재단법인 포항산업과학연구원 Magnesium Alloy Billet Continuous Casting Machine

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CN105478695A (en) * 2016-01-09 2016-04-13 石家庄钢铁有限责任公司 Multi-zone electromagnetic stirring device and method for continuous casting machine crystallizer

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JPS61119359A (en) 1984-11-15 1986-06-06 Showa Alum Ind Kk Continuous casting method of magnesium or ally thereof
JPS63149056A (en) * 1986-12-10 1988-06-21 Kobe Steel Ltd Continuous casting method for non-ferrous metal
JPH05148565A (en) * 1991-11-28 1993-06-15 Showa Alum Corp Production of particle dispersed magnesium alloy by using high energy density heat source
JPH07155906A (en) * 1993-12-08 1995-06-20 Leotec:Kk Method for continuously producing half-solidified metallic material having good workability by electromagnetic stirring method
JP2003340553A (en) 2002-05-28 2003-12-02 Sumitomo Metal Ind Ltd Continuous casting method for magnesium alloy sheet
JP2004195526A (en) 2002-12-20 2004-07-15 Sumitomo Metal Ind Ltd Continuous casting method for molten magnesium molten alloy

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101050798B1 (en) * 2008-12-19 2011-07-21 재단법인 포항산업과학연구원 Magnesium Alloy Billet Continuous Casting Machine

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