WO2005065866A1 - Procede et appareil pour fabriquer des articles moules presentant une structure spherique - Google Patents

Procede et appareil pour fabriquer des articles moules presentant une structure spherique Download PDF

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Publication number
WO2005065866A1
WO2005065866A1 PCT/KR2004/002977 KR2004002977W WO2005065866A1 WO 2005065866 A1 WO2005065866 A1 WO 2005065866A1 KR 2004002977 W KR2004002977 W KR 2004002977W WO 2005065866 A1 WO2005065866 A1 WO 2005065866A1
Authority
WO
WIPO (PCT)
Prior art keywords
molten metal
spherical structure
low pressure
electromagnetic field
electromagnetic
Prior art date
Application number
PCT/KR2004/002977
Other languages
English (en)
Inventor
Han-Jung Lee
Original Assignee
Han-Jung Lee
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Han-Jung Lee filed Critical Han-Jung Lee
Publication of WO2005065866A1 publication Critical patent/WO2005065866A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/10—Details of telephonic subscriber devices including a GPS signal receiver

Definitions

  • the present invention relates to a method and apparatus for manufacturing molded articles having a spherical structure, and more particularly to a method and apparatus for manufacturing molded articles having a spherical structure from molten metal through a low pressure die casting process.
  • low pressure die casting is a method for pouring molten metal into a mould equipped at an upper portion of a low pressure die casting apparatus via a feeding tube by pushing the molten metal upward against gravity through application of a gas, such as low pressure air or an inert gas, into a space where the molten metal is poured.
  • a gas such as low pressure air or an inert gas
  • a conventional low pressure die casting apparatus 1 comprises a gate 112 through which molten metal is poured, a molten metal holding furnace 110 having a gas introduction port 114 formed therein and through which a gas is introduced, a molding part 120 including upper and lower dies 122 and 124 equipped to the molten metal holding furnace 110, and a feeding tube 130 equipped between the molten metal holding furnace 110 and the upper and lower dies 122 and 124 for feeding the molten metal into the molding part 120.
  • the low pressure die casting method provides an excellent casting yield, and clean and precise castings having various shapes, while minimizing manufacturing costs and installation costs.
  • the part molded through the low pressure die casting method as described above has a fine and brittle dendritic structure, which reduces the toughness and durability of the products.
  • an agitating technology using an electromagnetic field has been developed.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide a method for manufacturing a molded product having a spherical structure through a low pressure die casting process. It is another object of the present invention to maintain molten metal at an optimal temperature for forming a spherical structure. It is still another object of the present invention to form a finer structure, thereby enhancing mechanical properties .
  • the above and other objects can be accomplished by the provision of a method for manufacturing a molded article having a spherical structure through a low pressure die casting process, wherein an intensive flow is generated in molten metal by electromagnetic field agitation to suppress growth of dendrites generated in a solid and liquid phase region upon solidification of the molten metal during a process of pouring the molten metal into a mould and then forming the molten metal into a preform, so that the molded preform has a fine spherical structure.
  • Preheating of the molten metal may be performed in conjunction with the electromagnetic field agitation.
  • a low pressure die casting apparatus comprising an electromagnetic agitator located between a molten metal holding furnace and upper and lower dies for generating an electromagnetic field in a feeding tube by application of electricity.
  • the apparatus may further comprise a pre-heater located between the feeding tube and the electromagnetic agitator.
  • the apparatus may further comprise a pressing member located above the upper die, the pressing member being provided with a closing member for closing a sprue of the lower die, and a pressing means for compressing the upper die .
  • Figs. 1 to 3 are diagrams illustrating a forming process using a low pressure die casting apparatus equipped with an electromagnetic agitator according to the present invention
  • Fig. 4 is a diagram illustrating molten metal in a state of being agitated by an electromagnetic field generated by the electromagnetic agitator according to the present invention
  • Fig. 5 is a diagram illustrating the molten metal having a structure changed in shape through agitation of the present invention
  • Fig. 6 is a micrograph illustrating a microstructure of a molded article formed according to the present invention
  • Fig. 7 is a schematic diagram illustrating conventional low pressure die casting
  • Fig. 8 is a micrograph illustrating a microstructure of a molded article formed using the conventional low pressure die casting of Fig. 7.
  • Figs. 1 to 3 are diagrams illustrating a forming process using a low pressure die casting apparatus equipped with an electromagnetic agitator according to the present invention.
  • a low pressure die casting apparatus 1 of the present invention also comprises a molten metal gate (not shown) through which molten metal is poured, a molten metal holding furnace 110 having a gas introduction port 114 formed therein and through which gas is introduced, a molding part 120 comprising upper and lower dies 122 and 124 equipped to the molten metal holding furnace 110, and a feeding tube 130 equipped between the molten metal holding furnace 110 and the upper and lower dies 122 and 124 for feeding the molten metal into the molding part 120.
  • the low pressure die casting apparatus 1 of the invention further comprises an electromagnetic agitator 10 located between the molten metal holding furnace 110 and upper and lower dies 122 and 124 for generating an electromagnetic field in the feeding tube 130 by application of electricity.
  • the low pressure die casting apparatus 10 further comprises a typical pre-heater 20, such as a heater generating heat by application of electricity, located between the feeding tube 130 and the electromagnetic agitator 10, so that the molten metal within the feeding tube can be maintained at a constant temperature together with the electromagnetic field agitation by the electromagnetic agitator 10, thereby allowing efficient electromagnetic field agitation.
  • the apparatus 1 may comprise a well-known pressing member 140 located above the upper die 122, in which the pressing member 140 is provided with a closing member 30 for closing a sprue 124a of the lower die 124, and a well-known pressing means 40 for pressing and ejecting the upper die 122.
  • molten metal poured into the molten metal holding furnace 110 is pressed by gas, and is fed into a space between the upper and lower dies 122 and 124 of the molding part 120 through the feeding tube 130, as shown in Fig. 1.
  • electromagnetic field agitation is performed for 1 to 3 minutes by means of the electromagnetic agitator 10 located between the molten metal holding furnace 110 and upper and lower dies 122 and 124. That is, as shown in Fig. 4, as the molten metal passes through the feeding tube 130 where the electromagnetic agitator 10 is equipped, an intensive flow of the molten metal is generated by an electromagnetic field to suppress growth of dendrites created in a solid and liquid phase region upon solidification of the molten metal, thereby providing a fine spherical structure. At this time, transformation from the dendrite particles into spherical particles is performed, as shown in Fig.
  • the molten metal agitated by the electromagnetic field is compressed and filled in the space between the upper and lower dies 122 and 124, and is then primarily molded into a preform having a fine spherical structure.
  • the sprue 124a of the lower die 124 is closed, as shown in Fig. 2, by the closing member 30 of the pressing member 140 located above the upper die 122, the pressure is released from the molten metal holding furnace 110, thereby completing a primary molding.
  • the upper die 122 is subjected to multi- stage compression by the pressing means 40 provided to the pressing member 140, as shown in Fig.
  • the molten metal is formed to have the fine spherical structure between the dies through the electromagnetic agitation, thereby allowing the molded article to have a light weight, excellent mechanical properties, and formability while remarkably reducing the manufacturing costs. Additionally, upon the electromagnetic agitation, the molten metal is maintained at a constant temperature, thereby promoting transformation into the spherical structure. Additionally, the preform between the upper and lower dies subjected to multi-stage compression by the pressing means, so that the finished article has the microstructure excellent in mechanical properties.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Forging (AREA)

Abstract

L'invention concerne un procédé et un appareil permettant de fabriquer des articles moulés possédant une structure sphérique, et plus particulièrement un procédé et un appareil pour fabriquer de tels articles moulés à partir d'un métal en fusion par moulage sous basse pression. Dans ce procédé, un flux intensif est engendré dans le métal en fusion par agitation sous champ électromagnétique en vue de supprimer la croissance des dendrites produites au cours de la phase solide et de la phase liquide lors de la solidification du métal en fusion durant sa coulée dans un moule et ensuite son formage pour obtenir une préforme, de sorte que la préforme moulée présente une structure sphérique affinée.
PCT/KR2004/002977 2004-01-07 2004-11-17 Procede et appareil pour fabriquer des articles moules presentant une structure spherique WO2005065866A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2004-0000930 2004-01-07
KR1020040000930A KR20050072582A (ko) 2004-01-07 2004-01-07 구형화 조직을 갖는 성형물의 제조방법 및 장치

Publications (1)

Publication Number Publication Date
WO2005065866A1 true WO2005065866A1 (fr) 2005-07-21

Family

ID=34747778

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2004/002977 WO2005065866A1 (fr) 2004-01-07 2004-11-17 Procede et appareil pour fabriquer des articles moules presentant une structure spherique

Country Status (2)

Country Link
KR (1) KR20050072582A (fr)
WO (1) WO2005065866A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106424659A (zh) * 2016-11-08 2017-02-22 北京星航机电装备有限公司 一种铝合金低压铸造装置
CN109249011A (zh) * 2017-07-12 2019-01-22 北京有色金属研究总院 一种制备细晶均质铸件用复合熔体处理装置及方法
CN110831713A (zh) * 2019-07-05 2020-02-21 苏州明志科技股份有限公司 一种采用电磁搅拌技术的低压充型方法及装置
WO2022257400A1 (fr) * 2021-06-08 2022-12-15 苏州明志科技股份有限公司 Procédé et appareil de moulage à l'état micro-solide

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100620594B1 (ko) * 2005-11-29 2006-09-06 한 중 이 구형화 조직을 갖는 성형물 제조에 따른 교반장치
CN115007839B (zh) * 2022-06-13 2023-07-18 浙江大学 一种半固态流变成形低压铸造方法
CN114734022B (zh) * 2022-06-13 2022-08-30 中国航发北京航空材料研究院 一种制备中小型铸件的金属型低压浇铸置顶凝固装置和方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4524820A (en) * 1982-03-30 1985-06-25 International Telephone And Telegraph Corporation Apparatus for providing improved slurry cast structures by hot working
US5178204A (en) * 1990-12-10 1993-01-12 Kelly James E Method and apparatus for rheocasting
KR20020047916A (ko) * 2000-12-14 2002-06-22 이계안 세미솔리드 메탈 제조방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4524820A (en) * 1982-03-30 1985-06-25 International Telephone And Telegraph Corporation Apparatus for providing improved slurry cast structures by hot working
US5178204A (en) * 1990-12-10 1993-01-12 Kelly James E Method and apparatus for rheocasting
KR20020047916A (ko) * 2000-12-14 2002-06-22 이계안 세미솔리드 메탈 제조방법

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106424659A (zh) * 2016-11-08 2017-02-22 北京星航机电装备有限公司 一种铝合金低压铸造装置
CN109249011A (zh) * 2017-07-12 2019-01-22 北京有色金属研究总院 一种制备细晶均质铸件用复合熔体处理装置及方法
CN110831713A (zh) * 2019-07-05 2020-02-21 苏州明志科技股份有限公司 一种采用电磁搅拌技术的低压充型方法及装置
WO2021003627A1 (fr) * 2019-07-05 2021-01-14 苏州明志科技有限公司 Procédé et appareil de remplissage de moule à basse pression à l'aide une technique d'agitation électromagnétique
WO2022257400A1 (fr) * 2021-06-08 2022-12-15 苏州明志科技股份有限公司 Procédé et appareil de moulage à l'état micro-solide

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Publication number Publication date
KR20050072582A (ko) 2005-07-12

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