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WO2002013995A1 - Procede de coulage basse pression et dispositif associe - Google Patents

Procede de coulage basse pression et dispositif associe Download PDF

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Publication number
WO2002013995A1
WO2002013995A1 PCT/KR2001/001366 KR0101366W WO0213995A1 WO 2002013995 A1 WO2002013995 A1 WO 2002013995A1 KR 0101366 W KR0101366 W KR 0101366W WO 0213995 A1 WO0213995 A1 WO 0213995A1
Authority
WO
WIPO (PCT)
Prior art keywords
molten metal
molding cavity
mold
molten
low pressure
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2001/001366
Other languages
English (en)
Inventor
Jun Su Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technology Union Co Ltd
Original Assignee
Technology Union Co Ltd
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 Technology Union Co Ltd filed Critical Technology Union Co Ltd
Priority to AU2001277804A priority Critical patent/AU2001277804A1/en
Publication of WO2002013995A1 publication Critical patent/WO2002013995A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates

Definitions

  • the present invention relates, in general, to a low pressure casting method and apparatus and, more particularly, to a low pressure casting method and apparatus which is intended to shorten a time period required to cast molten metal into a molding cavity of a mold and then to allow the molten metal to be solidified in order to maximize productivity, and intended to cause a solidification progress to be uniform and rapid to improve mechanical properties of molded products resulting in maximization of its commercial value.
  • a low pressure casting process is intended to gradually cast molten metal at low pressure from an a furnace underneath of a mold and then to allow the molten metal to be solidified, differently from a common die casting process.
  • Such a low pressure casting process is predominantly used to produce engine blocks, cylinder heads, wheels, or the like, because the molten metal produces few casting defects and limits inclusion of extraneous substances, such as oxides, and it is possible to produce precision casting products.
  • a mold having therein a molding cavity of a shape the same as that of a desired product, and a molten-metal holding furnace filled at its lower portion with molten metal are prepared.
  • the molten metal received in the molten-metal holding furnace is gently cast into the molding cavity through one or more runners and casting openings in the mold by applying pressure or elevating a level of the molten metal.
  • a certain pressure must be exerted on the molten metal and maintained until the molten metal in the mold is completely solidified.
  • the molten metal in the runners that is not solidified yet is returned to the molten-metal holding furnace by eliminating the pressure exerted thereon, and then the mold is opened to enable the molded product to be removed.
  • the above-mentioned low pressure casting process advantageously has a high recovery rate of molten metal because molten metal in runners is directly cast into a molding cavity in a mold through casting openings, flow of the molten metal is concentrated at portions in the vicinities of the casting openings of the mold, thereby causing the portions to be heated to high temperature as compared with other portions of the mold.
  • time required for one cycle of a casting operation in the low pressure casting process may vary depending on a shape and a size of a desired casting product
  • a time period of 15 - 20 minutes may be required for casting of a cylinder head.
  • time period only 1 - 2 minutes is required for supplying molten metal into a mold, for removing a molded product from the mold, and for cooling the mold, while the remaining time is required for solidification of molten metal, in particular, for complete solidification of molten metal in vicinities of casting openings.
  • the above-described low pressure casting process has disadvantages in that total time required for one cycle of a low pressure casting operation is lengthened because of heat concentrated at vicinities of pouring gates of a mold, and mechanical properties of molded products are deteriorated because crystals of molded products in adjacent to the vicinities of casting openings become coarse or Dendrite Arm Spacing becomes large.
  • Japanese Patent Laid-Open Publication No. 10-296423 discloses a method for shortening a time required for solidification of molten metal by forcibly cooling portions of a lower mold.
  • molten metal positioned outside a molding cavity i.e., in contact with a mold can be rapidly solidified, but molten metal disposed at the center of the molding cavity and molten metal disposed at pouring gates, through which molten metal is cast into the molding cavity, is hardly affected by the cooling of the mold, thereby causing the solidification time to still be long.
  • the method disclosed in the publication has disadvantages in that flowability of molten metal disposed outside of the molding cavity becomes worse to cause casting ability of the molten metal to be deteriorated owing to supercooling of the molten metal, and mechanical properties of resulting products are also deteriorated owing to great differences among solidification times of molten metal disposed inside and outside of a molding cavity and of molten metal disposed at casting openings.
  • a method for shortening time required for solidification of molten metal by forcibly cooling only portions around casting openings of a mold, through which the molten metal is cast is also disclosed.
  • an object of the present invention is to provide a low pressure casting method and apparatus intended to maximize productivity of casting products by shortening total time required for a casting operation.
  • the present invention provides a low pressure casting method and apparatus adapted to cast molten metal received in a molten- metal holding furnace into a molding cavity of a mold through riser tubes at low pressure and then to solidify the molten metal, including the steps of: preparing a mold having a molding cavity communicated to runners via a plurality of branch gates; casting molten metal received in a molten-metal holding furnace into the runners through riser tubes; distributing the molten metal cast in the runners through a plurality of branch gates; introducing the molten metal into the molding cavity of the mold; and allowing the molten metal introduced in the molding cavity to be cooled.
  • Fig. 1 is a side elevation view showing an apparatus according to the present invention.
  • Fig. 2 is a top plan view showing a substantial part of the invention.
  • a low pressure casting method according to the invention will be first described in detail as follows.
  • the invention provides a low pressure casting method adapted to cast molten metal received in a molten-metal holding furnace into a molding cavity of a mold through riser tubes at low pressure and then to solidify the molten metal.
  • a mold having a molding cavity communicated to runners via a plurality of branch gates is prepared.
  • Molten metal received in a molten-metal holding furnace is cast into the runners through riser tubes.
  • the molten metal cast in the runners is distributed through a plurality of branch gates, and then introduced into the molding cavity of the mold.
  • the molten metal introduced in the molding cavity is allowed to cool.
  • molten metal in the molten-metal holding furnace is cast into the runners through the riser tubes under pressure, and then the molten metal in the runners is distributed into the plurality of branch gates and indirectly introduced into the molding cavity.
  • each of the casting openings is not excessively heated owing to the reduced flow volume of molten metal.
  • heat from hot molten metal in the riser tubes is not directly transferred to the casting openings of the molding cavity to prevent a rise in temperature of the casting openings, time required for solidification of molten metal in the casting openings can be shortened, and molten metal in the molding cavity is uniformly and rapidly cooled, thereby enabling mechanical properties of molded products to be excellent.
  • the apparatus according to the invention includes a mold 10 having a molding cavity of a certain shape, a molten-metal holding furnace 20 receiving molten metal therein, and riser tubes 30 for casting the molten metal in the molten-metal holding furnace 20 into the molding cavity 15 at low pressure.
  • the molding cavity 15 of the mold 10 is communicated to runners 40 via a plurality of branch gates 42 disposed around the molding cavity 15.
  • the runners 40 are communicated to at least one riser tube 30.
  • the runners 40 are provided around the molding cavity 15.
  • Reference numeral 16 denotes casting openings.
  • the molten metal received in the molten-metal holding furnace 20 is raised through the riser tubes 30 and then cast into the runners 40 of the mold 10.
  • the molten metal cast in the runners 40 is distributed through the plurality of branch gates 42 and then indirectly filled into the molding cavity 15 of the mold 10.
  • Example 2 A conventional method (wherein riser tubes are communicated to a molding cavity) and the present invention (wherein a molding cavity is communicated at its both sides to runners through ten branch gates, and the runners are communicated to four riser tubes) are tested so as to compare both methods.
  • the present invention is capable of shortening time for production of molded products to maximize productivity by preventing overheating of casting openings owing to flow of molten metal concentrated thereto and by lowering temperature of molten metal by shortened flowing distance of molten metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

De manière générale, la présente invention concerne un procédé de coulage basse pression ainsi qu'un dispositif associé. Plus particulièrement, l'invention concerne un procédé de coulage basse pression et un dispositif permettant de raccourcir la durée requise pour le coulage d'un métal en fusion dans une cavité de moulage d'un moule et pour la solidification dudit métal en fusion, d'où une productivité optimisée. Ce procédé et ce dispositif permettent d'obtenir une solidification uniforme et rapide et des propriétés mécaniques améliorées pour les produits moulés, ce qui maximise leur valeur commerciale. L'invention a pour objet un procédé de coulage basse pression et un dispositif servant à couler du métal en fusion reçu dans un four pour métal fondu (20) dans la cavité de moulage (15) d'un moule (10) par l'intermédiaire de tubes montants (30) à une pression peu élevée, puis à solidifier le métal en fusion. Ledit procédé consiste à préparer un moule (10) comportant une cavité de moulage (15) communiquant avec des canaux de coulée (40) via une pluralité d'attaques dérivées (42), à couler le métal en fusion reçu dans un four pour métal fondu (20) dans les canaux de coulée (40) par l'intermédiaire des tubes montants (30), puis à couler le métal en fusion introduit dans les canaux de coulée (40) via une pluralité d'attaques dérivées (42) dans la cavité de moulage (15) du moule (10).
PCT/KR2001/001366 2000-08-14 2001-08-10 Procede de coulage basse pression et dispositif associe Ceased WO2002013995A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001277804A AU2001277804A1 (en) 2000-08-14 2001-08-10 Low pressure casting method and apparatus thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020000046990A KR20020013304A (ko) 2000-08-14 2000-08-14 저압주조 방법 및 그 장치
KR2000/046990 2000-08-14

Publications (1)

Publication Number Publication Date
WO2002013995A1 true WO2002013995A1 (fr) 2002-02-21

Family

ID=19683132

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2001/001366 Ceased WO2002013995A1 (fr) 2000-08-14 2001-08-10 Procede de coulage basse pression et dispositif associe

Country Status (3)

Country Link
KR (1) KR20020013304A (fr)
AU (1) AU2001277804A1 (fr)
WO (1) WO2002013995A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007095719A1 (fr) * 2006-02-24 2007-08-30 Husky Injection Molding Systems Ltd. Chenal de coulee de materiau de moulage metallique ayant un flux equilibre
CN110899665A (zh) * 2019-12-30 2020-03-24 重庆长安汽车股份有限公司 一种适用于多层复杂结构铸件的低压铸造方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01180769A (ja) * 1987-12-28 1989-07-18 Nissan Motor Co Ltd 砂型を用いた低圧鋳造方法
JPH03124343A (ja) * 1989-10-08 1991-05-27 Asahi Tec Corp 車両用ホイールの鋳型装置
JPH08243720A (ja) * 1995-03-06 1996-09-24 Asahi Tec Corp 車両用ホイールの低圧鋳造装置
US5611388A (en) * 1993-09-02 1997-03-18 Mazda Motor Corporation Method of and apparatus for low-pressure casting
JPH10305361A (ja) * 1997-05-06 1998-11-17 Hitachi Metals Ltd 減圧鋳造用凝固解析法及びそれを用いた減圧鋳造方法並びに鋳物

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50143726A (fr) * 1974-05-09 1975-11-19
JPH0360857A (ja) * 1989-07-27 1991-03-15 Asahi Tec Corp 車両用ホイールの鋳造装置
JP2866217B2 (ja) * 1991-04-25 1999-03-08 株式会社神戸製鋼所 Ｍｇ合金製二輪ホイールの低圧鋳造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01180769A (ja) * 1987-12-28 1989-07-18 Nissan Motor Co Ltd 砂型を用いた低圧鋳造方法
JPH03124343A (ja) * 1989-10-08 1991-05-27 Asahi Tec Corp 車両用ホイールの鋳型装置
US5611388A (en) * 1993-09-02 1997-03-18 Mazda Motor Corporation Method of and apparatus for low-pressure casting
JPH08243720A (ja) * 1995-03-06 1996-09-24 Asahi Tec Corp 車両用ホイールの低圧鋳造装置
JPH10305361A (ja) * 1997-05-06 1998-11-17 Hitachi Metals Ltd 減圧鋳造用凝固解析法及びそれを用いた減圧鋳造方法並びに鋳物

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007095719A1 (fr) * 2006-02-24 2007-08-30 Husky Injection Molding Systems Ltd. Chenal de coulee de materiau de moulage metallique ayant un flux equilibre
US7387154B2 (en) 2006-02-24 2008-06-17 Husky Injection Molding Systems Ltd. Metallic-molding-material runner having equilibrated flow
CN110899665A (zh) * 2019-12-30 2020-03-24 重庆长安汽车股份有限公司 一种适用于多层复杂结构铸件的低压铸造方法

Also Published As

Publication number Publication date
AU2001277804A1 (en) 2002-02-25
KR20020013304A (ko) 2002-02-20

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