WO2014164593A1 - Ensemble tube d'injection isothermique - Google Patents

Ensemble tube d'injection isothermique Download PDF

Info

Publication number
WO2014164593A1
WO2014164593A1 PCT/US2014/022946 US2014022946W WO2014164593A1 WO 2014164593 A1 WO2014164593 A1 WO 2014164593A1 US 2014022946 W US2014022946 W US 2014022946W WO 2014164593 A1 WO2014164593 A1 WO 2014164593A1
Authority
WO
WIPO (PCT)
Prior art keywords
shot tube
coolant
recited
molten material
sleeve
Prior art date
Application number
PCT/US2014/022946
Other languages
English (en)
Inventor
Mario P. BOCHIECHIO
Carl R. Verner
Mark F. BARTHOLOMEW
John F. BLONDIN
Yan Seng LOH
Yuan Kwang LIM
Original Assignee
United Technologies Corporation
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 United Technologies Corporation filed Critical United Technologies Corporation
Priority to US14/773,452 priority Critical patent/US20160038999A1/en
Priority to EP14778138.9A priority patent/EP2969311A4/fr
Publication of WO2014164593A1 publication Critical patent/WO2014164593A1/fr

Links

Classifications

    • 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
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2038—Heating, cooling or lubricating the injection unit

Definitions

  • a die casting process utilizes a mold cavity defined between two mold halves. Molten metal material is fed in to the cavity and held under pressure until the metal has solidified. The mold halves are then separated and the cast part removed.
  • the shot tube is an integral part of the die casting tooling. The shot tube serves as the mechanism that is utilized to hold molten material prior to the initiation of the injection process that introduces the molten metal to the cavity.
  • the shot tube includes an opening for introducing molten material into a bore that leads to the cavity.
  • a plunger moves within the bore to inject and compress the molten material into the cavity. Upon solidification of the alloy, the moving platen retracts from the stationary platen. During this process the plunger continues forward to facilitate the ejection of the biscuit or puck from the end of the shot tube. The plunger is then subsequently withdrawn, the die set closed and additional material is introduced into the plunger for fabricating another part within the same cavity.
  • the shot tube experiences very high temperatures as a result of intimate contact with molten metal material and therefore is fabricated of materials compatible with those high temperatures.
  • materials that are compatible with the high temperatures encountered during the die casting process can be costly and difficult to machine. Accordingly, it is desirable to design and develop shot tubes that can withstand the high temperatures while reducing cost and easing manufacturing.
  • a shot tube assembly for a die casting process includes an outer sleeve open at each end including an outer pour opening for receiving molten material.
  • An inner sleeve defines a core for molten material.
  • the inner sleeve is disposed within the outer sleeve and open at each end with an inner pour opening aligned with the outer pour opening.
  • a spiral passage encircles the inner cavity.
  • An inlet communicates a coolant to the spiral passages.
  • An outlet exhausts coolant from the spiral passage.
  • the outer sleeve includes an inner surface and the inner sleeve includes an outer surface and the spiral passage is at least partially defined by each of the inner and outer surfaces.
  • the inlet and outlet are disposed on a common end adjacent to the pour opening.
  • the inlet and outlet includes a plurality of inlets and a plurality of outlets.
  • the inner sleeve and the outer sleeve include a common material with a common coefficient of thermal expansion.
  • the inner sleeve and the outer sleeve include different materials with different coefficients of thermal expansion.
  • a shot tube assembly for a die casting process includes an outer sleeve open at each end including an outer pour opening for receiving molten material.
  • An inner sleeve defines a core for molten material.
  • the inner sleeve is disposed within the outer sleeve and open at each end with an inner pour opening aligned with the outer pour opening.
  • a coolant passage is disposed about the inner cavity.
  • a trip strip within the coolant passage generates a turbulent flow in coolant flowing through the coolant passage.
  • An inlet communicates a coolant to the coolant passage.
  • An outlet exhausts coolant from the coolant passage.
  • the outer sleeve includes an inner surface and the inner sleeve includes an outer surface and the coolant passage is at least partially defined by each of the inner and outer surfaces.
  • a method of casting a cast article includes defining a mold cavity between at least two mold parts, mounting a shot tube, maintaining a desired temperature of the shot tube by passing a liquid metal material through passages defined within the shot tube, pouring a quantity of molten material into a core defined within the shot tube through a pour opening in the shot tube, forcing the molten material into the mold cavity, and curing the molten material within the mold cavity.
  • the shot tube includes an inner sleeve disposed within an inner sleeve with the passages defined between the inner sleeve and the outer sleeve and the liquid metal material circulates through the passages to maintain a desired temperature of the shot tube.
  • a casting system includes a mold including at least one cavity for receiving molten material.
  • a shot tube includes an outer sleeve open at each end including an outer pour opening for receiving molten material.
  • An inner sleeve defines a core for molten material.
  • the inner sleeve is disposed within the outer sleeve and open at each end with an inner pour opening aligned with the outer pour opening.
  • a spiral passage is defined between the inner sleeve and the outer sleeve.
  • An inlet communicates a coolant to the spiral passage.
  • An outlet exhausts coolant from the spiral passage.
  • a plunger is movable through the bore of the shot tube for forcing molten material through the inner cavity and into the at least one cavity.
  • the outer sleeve includes an inner surface and the inner sleeve includes an outer surface and the spiral passage is at least partially defined by each of the inner and outer surfaces.
  • the coolant includes a liquid metal material.
  • Figure 1 is a schematic view an example mold assembly.
  • Figure 2 is a cross-section of an example shot tube.
  • Figure 3 is a perspective view of the example shot tube.
  • Figure 4 is a schematic view of trip strips within a passage of the shot tube.
  • Figure 1 schematically illustrates an example casting system 10 that includes a mold 12 having a first part 14 and a second part 16 that defines a cavity 18.
  • the example mold 12 includes an opening 20 that receives a shot tube 22.
  • the example shot tube 22 defines a bore 34 through which molten material 26 are injected into the cavity 18.
  • a plunger 24 is movable within the bore 34 to inject the molten material 26 into the cavity 18.
  • the molten material 26 is of a temperature in excess of 2000 °F (1093 °C). Accordingly, the material comprising the shot tube 22 must be compatible with the excessive temperatures of the molten material 26.
  • the example casting system 10 includes a coolant circuit 52 for circulating a coolant through the shot tube 22. Coolant flow through the shot tube 22 removes heat to maintain the shot tube 22 within a desired temperature range for the casting process.
  • the example coolant circuit 52 includes a pump 54 that pumps coolant 60 into passages defined within the shot tube 22. Coolant exhausted form the shot tube 22 flows through a heat exchanger 58 and then back to a reservoir 50. The circulated coolant 60 removes heat input into the shot tube 22 form the molten metal material 26.
  • the coolant comprise a liquid metal material that is circulated through the coolant circuit 52 and the shot tube 22.
  • the liquid metal may comprise a gallium based alloy, lead bismuth alloy, indium alloys, tin-indium alloys, tin alloys, zinc alloys, pewter alloys, antimony alloys, aluminum alloys or any other liquid metal alloys and compounds with properties favorable for maintaining the shot tube 22 within a desired temperature range.
  • the use of liquid metal coolant provides increased heat transfer capabilities as compared to non-metal liquid coolants.
  • the shot tube 22 includes an outer sleeve 28 that circumscribes an inner sleeve 30.
  • the outer sleeve 28 and the inner sleeve 30 include aligned pour openings 36, 38 on a first end 32.
  • a second end 35 is received within the opening 20 of the mold 12 ( Figure 1).
  • the inner sleeve includes an outer surface 48 and the outer sleeve 28 includes an inner surface 50.
  • a spiral passage 42 is defined between the inner surface 50 and the outer surface 48. The spiral passage 42 encircles the inner cavity 40 and provides a path for the circulation of coolant 60 for removing heat from the shot tube 22.
  • An inlet 44 and an outlet 46 provide for circulation of coolant through the passages 42.
  • the inlet 44 is disposed near the pour opening 36 and the outlet 46 is disposed near the second end 35 that is received within the opening 20 of the mold 12.
  • the second end of the shot tube 22 is received within the opening 20 of the mold 12 and coolant is flowed through the spiral passages 42 to maintain the shot tube 22 at a desired temperature.
  • the coolant 60 is flowed into and out of the shot tube 22 such that heat is removed at a rate that maintains the temperature within a desired range.
  • the molten material 26 is then added to through the pour openings 36, 38. Once the molten material 26 is disposed within the cavity, the plunger 24 drives the molten material into the cavity 18 for fabrication of the desired part. The part is allowed to cure and then is removed from the mold 12.
  • the heat transfer and removal performance of the coolant can be enhanced by the configuration of the spiral passages 42.
  • the spacing between loops of the spiral passages 42 can prevent the occurrence of hot spots within the shot tube 22.
  • other features can be added to the spiral passages 42 to enhance heat transfer performance.
  • the spiral passage 42 includes flow disrupting features 68 that generate turbulent flows indicated at 64 in the coolant.
  • the turbulent flows 64 mix the coolant 60 and provides for more of the coolant 60 to contact walls of the passage 42.
  • the flow disrupting features 68 can include trip strips 62 and/or pedestals 66 that generate the turbulent flows 64 in the coolant 60.
  • the flow disrupting features 68 can be all trip strips 64 or all pedestals 66 or a combination of both trip strips 64 and pedestals to provide the desired generation of turbulent flows 64.
  • the specific arrangement of flow disrupting features 68 can include other shapes to provide the desired turbulent flow 64 and improve thermal transfer of heat to the coolant 60.
  • the trip strips 62 and pedestals 66 increase surface area for heat transfer that further improves the capability of the coolant to maintain the shot tube within a desired temperature range.
  • the example shot tube 22, casting system 10 and method provide greater control of temperatures during casting to reduce wear and increase shot tube life.

Landscapes

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

Abstract

La présente invention se rapporte à un ensemble tube d'injection pour un procédé de coulée sous pression, ledit ensemble comprenant un passage en spirale destiné à faire circuler un fluide caloporteur autour d'une cavité qui contient la matière métallique en fusion. Le fluide caloporteur circulant permet une régulation de la température du tube d'injection qui améliore le procédé de coulée et prolonge la durée de vie du tube d'injection.
PCT/US2014/022946 2013-03-12 2014-03-11 Ensemble tube d'injection isothermique WO2014164593A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US14/773,452 US20160038999A1 (en) 2013-03-12 2014-03-11 Isothermal shot tube assembly
EP14778138.9A EP2969311A4 (fr) 2013-03-12 2014-03-11 Ensemble tube d'injection isothermique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361776974P 2013-03-12 2013-03-12
US61/776,974 2013-03-12

Publications (1)

Publication Number Publication Date
WO2014164593A1 true WO2014164593A1 (fr) 2014-10-09

Family

ID=51658909

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2014/022946 WO2014164593A1 (fr) 2013-03-12 2014-03-11 Ensemble tube d'injection isothermique

Country Status (3)

Country Link
US (1) US20160038999A1 (fr)
EP (1) EP2969311A4 (fr)
WO (1) WO2014164593A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017141480A1 (fr) * 2016-02-15 2017-08-24 日立金属株式会社 Manchon de coulée sous pression et procédé pour la fabrication de ce dernier
EP3287212A1 (fr) * 2016-08-26 2018-02-28 United Technologies Corporation Manchon à faible module pour coulée sous pression à haute température
WO2017152904A3 (fr) * 2016-03-07 2019-02-28 Ksm Castings Group Gmbh Chambre d'injection d'une machine de coulée sous pression à chambre froide pourvue d'un dispositif de refroidissement, et dispositif de refroidissement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102067082B1 (ko) * 2017-01-19 2020-01-16 삼성에스디아이 주식회사 패턴 형성 방법 및 반도체 소자

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086953A (en) * 1975-02-24 1978-05-02 Kraklau David M Shot sleeve
US4660614A (en) 1984-01-19 1987-04-28 Maschinenfabrik Muller-Weingarten Ag Die casting method
US5492166A (en) * 1994-12-06 1996-02-20 Aluminum Company Of America Shot sleeve having a passageway for fluid flow
US5775402A (en) 1995-10-31 1998-07-07 Massachusetts Institute Of Technology Enhancement of thermal properties of tooling made by solid free form fabrication techniques
EP1375034A2 (fr) 2002-06-20 2004-01-02 Howmet Research Corporation Procédé et dispositif pour la coulée par solidification dirigée de métal en fusion
KR20060025750A (ko) * 2004-09-17 2006-03-22 서영범 다이캐스팅기의 냉각 슬리브
US20120199305A1 (en) * 2011-02-09 2012-08-09 Bochiechio Mario P Shot tube plunger for a die casting system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3216432A1 (de) * 1982-05-03 1983-11-03 Varta Batterie Ag, 3000 Hannover Verfahren und vorrichtung zum giessen von elektrodengittern fuer elektrische akkumulatoren
JP2001019858A (ja) * 1999-07-09 2001-01-23 Mitsubishi Plastics Ind Ltd 導電性樹脂シート
US20100147481A1 (en) * 2008-12-15 2010-06-17 General Electric Company Methods of manufacturing casted articles, and systems

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086953A (en) * 1975-02-24 1978-05-02 Kraklau David M Shot sleeve
US4660614A (en) 1984-01-19 1987-04-28 Maschinenfabrik Muller-Weingarten Ag Die casting method
US5492166A (en) * 1994-12-06 1996-02-20 Aluminum Company Of America Shot sleeve having a passageway for fluid flow
US5775402A (en) 1995-10-31 1998-07-07 Massachusetts Institute Of Technology Enhancement of thermal properties of tooling made by solid free form fabrication techniques
EP1375034A2 (fr) 2002-06-20 2004-01-02 Howmet Research Corporation Procédé et dispositif pour la coulée par solidification dirigée de métal en fusion
KR20060025750A (ko) * 2004-09-17 2006-03-22 서영범 다이캐스팅기의 냉각 슬리브
US20120199305A1 (en) * 2011-02-09 2012-08-09 Bochiechio Mario P Shot tube plunger for a die casting system
EP2486994A2 (fr) 2011-02-09 2012-08-15 United Technologies Corporation Piston de seringue pour système de moulage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2969311A4

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017141480A1 (fr) * 2016-02-15 2017-08-24 日立金属株式会社 Manchon de coulée sous pression et procédé pour la fabrication de ce dernier
JP6281672B2 (ja) * 2016-02-15 2018-02-21 日立金属株式会社 ダイカスト用スリーブ及びその製造方法
US10766068B2 (en) 2016-02-15 2020-09-08 Hitachi Metals, Ltd. Die-casting sleeve and its production method
WO2017152904A3 (fr) * 2016-03-07 2019-02-28 Ksm Castings Group Gmbh Chambre d'injection d'une machine de coulée sous pression à chambre froide pourvue d'un dispositif de refroidissement, et dispositif de refroidissement
EP3287212A1 (fr) * 2016-08-26 2018-02-28 United Technologies Corporation Manchon à faible module pour coulée sous pression à haute température
US10245637B2 (en) 2016-08-26 2019-04-02 United Technologies Corporation Low modulus shot sleeve for high temperature die casting

Also Published As

Publication number Publication date
US20160038999A1 (en) 2016-02-11
EP2969311A1 (fr) 2016-01-20
EP2969311A4 (fr) 2016-09-14

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