US20010052402A1 - Vacuum die-casting method for producing castings of nonferrous alloys - Google Patents

Vacuum die-casting method for producing castings of nonferrous alloys Download PDF

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Publication number
US20010052402A1
US20010052402A1 US09/878,215 US87821501A US2001052402A1 US 20010052402 A1 US20010052402 A1 US 20010052402A1 US 87821501 A US87821501 A US 87821501A US 2001052402 A1 US2001052402 A1 US 2001052402A1
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US
United States
Prior art keywords
die
ladle
gas
holding furnace
air
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.)
Abandoned
Application number
US09/878,215
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English (en)
Inventor
Graziano Mortari
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.)
Idra Presse SpA
Original Assignee
Idra Presse SpA
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 Idra Presse SpA filed Critical Idra Presse SpA
Assigned to IDRA PRESSE S.P.A. reassignment IDRA PRESSE S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MORTARI, GRAZIANO
Publication of US20010052402A1 publication Critical patent/US20010052402A1/en
Abandoned legal-status Critical Current

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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
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/02—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by volume
    • B22D39/026—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by volume using a ladler
    • 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
    • B22D17/14—Machines with evacuated die cavity
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means

Definitions

  • the present invention relates to a vacuum die-casting method for producing castings of nonferrous alloys.
  • Forged parts have a satisfactory grain structure and are suitable particularly for considerable lengths.
  • the die-casting process consists in keeping the molten material in a holding furnace, subsequently transferring a specific quantity thereof into an injector for compression inside a die, and finally cooling the resulting casting.
  • Thixoforming lies, in terms of technical method, between forging and die-casting.
  • vacuum die-casting has slight advantages regarding component weight and greater freedom of configuration.
  • the die-casting process is much more advantageous if it relates to the production of large batches meant for high-volume assembly lines.
  • the die-cast parts are castings which are welded and/or are required, in various forms, to have plastic deformation properties, whereas parts obtained with the standard die-casting process are characterized by high porosity, high value of gas inclusions, poor weldability and low expansion value.
  • Die-cast parts must have specific elongation properties, and since there are no nondestructive elongation tests for materials, if the testing of one casting determines that the parts do not comply with quality requirements it is necessary to discard the entire batch.
  • the aim of the present invention is to provide a vacuum die-casting method which solves, or substantially reduces, the problems of conventional pressure die-casting methods.
  • an object of the present invention is to obtain thin-walled and/or thick-walled castings which are free from gases and/or porosities, can be welded and/or have high expansion values, and L-shaped and pressure-tight castings.
  • Another object of the invention is to provide a die-casting method for obtaining castings which preserves the qualities of the light material used.
  • Another object of the present invention is to provide a die-casting method which is flexible in terms of the type of nonferrous alloy used.
  • Another object of the invention is to provide a die-casting method which is characterized by a high degree of reliability, in terms of quality requirements of the resulting castings.
  • FIG. 1 is a view of an apparatus for performing a die-casting method according to the invention
  • FIGS. 2 and 3 are schematic views of two steps of the operation of a component of the apparatus.
  • an apparatus particularly for performing a vacuum die-casting method according to the invention is generally designated by the reference numeral 10 .
  • the method consists of a first step, in which the light material, usually a nonferrous aluminum alloy, is kept in a molten state in a holding furnace designated by the reference numeral 11 .
  • the holding furnace 11 comprises a section 12 for filling with the material and a section 13 for withdrawal of the material in a liquid state.
  • the material in the molten state is subjected to a degassing step by means of a rotor which is installed inside the furnace 11 , with a cover 14 of the section 12 in the closed configuration.
  • the withdrawal section 13 is a region in which the material is in a quiescent state, free from gas bubbles and filtered and therefore has an optimum degree of purity for the subsequent operations.
  • a preset amount of molten material is then poured from the withdrawal section 13 , by means of a ladle 15 , into a cylindrical chamber 16 of an injector which is generally designated by the reference numeral 17 .
  • the ladle 15 enters the withdrawal section 13 only after being held proximate to the holding furnace 11 for a period required and sufficient to reach a given operating temperature, so as to avoid affecting the temperature of the molten material that is drawn.
  • the ladle 15 enters the filling section 12 at an angle which depends on the amount of molten material that it must draw; the inclination, particularly the height of the lowest edge of the ladle, determines the height of the free surface of the drawn material.
  • the ladle 15 moves at a tipping rate which determines a constant filling rate of the cylindrical chamber 16 and a constant speed of the molten material, so as to minimize turbulence inside the cylindrical chamber 16 .
  • the material is protected against contact with air, in the regions not occupied by the containment means, by an atmosphere of a protective gas which has a greater relative density than air; advantageously, the protective gas is nitrogen, which has no environmental impact and is available at low cost as a residue of smelting.
  • the protective gas is thus contained in the holding furnace 11 .
  • the ladle 15 During withdrawal from the withdrawal section 13 , the ladle 15 , before making contact with the liquid material, enters the protective gas atmosphere.
  • the withdrawal method is such that the ladle 15 in any case contains an upper layer of protective gas even when it conveys the maximum possible quantity of liquid material.
  • the ladle in fact enters the section 13 at an angle and straightens after withdrawal, leaving an upper volume available for carrying the gas 22 , while the lower volume is filled with material 23 in the liquid state.
  • the inside of the cylindrical chamber 16 is filled with protective gas, so that even during the filling of such chamber the liquid material never makes contact with the air, avoiding the danger of forming inclusions which are dangerous for the quality of the casting.
  • the apparatus 10 is provided with valves 20 for introducing nitrogen and, at the dies 18 and injectors 17 , with valves 21 for generating a vacuum.
  • the casting Since the casting has no porosities, it has a greater mechanical strength than an equal casting performed with known methods.
  • thermal treatments (which entail additional costs and longer times) are no longer required in order to attain strength values which cannot be achieved in known processes.
  • the materials and the dimensions may be any according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Forging (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
US09/878,215 2000-06-20 2001-06-12 Vacuum die-casting method for producing castings of nonferrous alloys Abandoned US20010052402A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD2000A000166 2000-06-20
IT2000PD000166A IT1317349B1 (it) 2000-06-20 2000-06-20 Procedimento perfezionato di pressofusione sottovuoto per laproduzione di getti in leghe non ferrose.

Publications (1)

Publication Number Publication Date
US20010052402A1 true US20010052402A1 (en) 2001-12-20

Family

ID=11452014

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/878,215 Abandoned US20010052402A1 (en) 2000-06-20 2001-06-12 Vacuum die-casting method for producing castings of nonferrous alloys

Country Status (6)

Country Link
US (1) US20010052402A1 (it)
EP (1) EP1166922A1 (it)
JP (1) JP2002018565A (it)
BR (1) BR0102440A (it)
CA (1) CA2350286A1 (it)
IT (1) IT1317349B1 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100842004B1 (ko) 2007-05-07 2008-06-27 주식회사 임동 용융된 알루미늄합금을 이용한 물품 제조장치 및 그제어방법
EP2842659A1 (en) * 2013-08-30 2015-03-04 Suzhou Orange Diecasting Co., Ltd. A die casting machine with L-shape frame
CN108772555A (zh) * 2018-06-25 2018-11-09 溧阳市联华机械制造有限公司 一种真空吸铸室防爆装置及其控制方法
CN110026538A (zh) * 2019-04-28 2019-07-19 易平 一种精准定量取汤机构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105127398B (zh) * 2015-09-09 2018-02-23 东莞市隆盛智能装备有限公司 多工位全自动供料装置
CN109465422A (zh) * 2018-12-07 2019-03-15 蚌埠隆华压铸机有限公司 一种卧式冷室铝合金压铸机的给料装置
CN115570119A (zh) * 2022-10-21 2023-01-06 顺景园智能装备科技发展(深圳)有限公司 一种暴抽精密溶液负压浇铸设备

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742181C (de) * 1939-02-25 1943-11-24 Hahn & Kolb Vorrichtung zum UEberfuehren von leicht oxydierbaren Metallen in die Druckkammer von Pressgiessmaschinen
US5913353A (en) * 1994-09-26 1999-06-22 Ford Global Technologies, Inc. Process for casting light metals
JP3490188B2 (ja) * 1995-06-08 2004-01-26 東芝機械株式会社 真空ダイカストにおける真空制御方法およびその装置
JPH10291068A (ja) * 1997-04-17 1998-11-04 Hitachi Metals Ltd 液面波立ち抑制方法
DE19847700B4 (de) * 1998-10-16 2006-04-27 Abb Patent Gmbh Verfahren und Einrichtung zum Aufnehmen von flüssigem Metall mit einem Gießlöffel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100842004B1 (ko) 2007-05-07 2008-06-27 주식회사 임동 용융된 알루미늄합금을 이용한 물품 제조장치 및 그제어방법
EP2842659A1 (en) * 2013-08-30 2015-03-04 Suzhou Orange Diecasting Co., Ltd. A die casting machine with L-shape frame
US9156085B2 (en) 2013-08-30 2015-10-13 Suzhou Diecasting Co., Ltd. Die casting machine with L-shape frame
CN108772555A (zh) * 2018-06-25 2018-11-09 溧阳市联华机械制造有限公司 一种真空吸铸室防爆装置及其控制方法
CN110026538A (zh) * 2019-04-28 2019-07-19 易平 一种精准定量取汤机构

Also Published As

Publication number Publication date
EP1166922A1 (en) 2002-01-02
BR0102440A (pt) 2002-02-19
IT1317349B1 (it) 2003-06-16
ITPD20000166A1 (it) 2001-12-20
ITPD20000166A0 (it) 2000-06-20
CA2350286A1 (en) 2001-12-20
JP2002018565A (ja) 2002-01-22

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AS Assignment

Owner name: IDRA PRESSE S.P.A., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MORTARI, GRAZIANO;REEL/FRAME:011912/0009

Effective date: 20010601

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION