EP2450124A2 - Giesskolben für ein Druckgusssystem - Google Patents

Giesskolben für ein Druckgusssystem Download PDF

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Publication number
EP2450124A2
EP2450124A2 EP11187861A EP11187861A EP2450124A2 EP 2450124 A2 EP2450124 A2 EP 2450124A2 EP 11187861 A EP11187861 A EP 11187861A EP 11187861 A EP11187861 A EP 11187861A EP 2450124 A2 EP2450124 A2 EP 2450124A2
Authority
EP
European Patent Office
Prior art keywords
shot tube
face
piston head
charge
disposable piston
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.)
Withdrawn
Application number
EP11187861A
Other languages
English (en)
French (fr)
Other versions
EP2450124A3 (de
Inventor
Kevin W. Schlichting
Steven J. Bullied
Carl R. Verner
Benjamin Joseph Zimmerman
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.)
Raytheon Technologies Corp
Original Assignee
United Technologies Corp
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 Corp filed Critical United Technologies Corp
Publication of EP2450124A2 publication Critical patent/EP2450124A2/de
Publication of EP2450124A3 publication Critical patent/EP2450124A3/de
Withdrawn legal-status Critical Current

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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
    • B22D17/203—Injection pistons

Definitions

  • This disclosure relates generally to a die casting system, and more particularly to a shot tube plunger for a die casting system.
  • Casting is a known technique used to yield substantially net-shaped components.
  • investment casting is often used in the gas turbine engine industry to manufacture net-shaped components, such as blades and vanes having relatively complex shapes.
  • Investment casting involves pouring molten metal into a ceramic shell having a cavity in the shape of the component to be cast.
  • Investment casting can be relatively labor intensive, time consuming and expensive.
  • Die casting involves injecting molten metal directly into a reusable die to yield a net-shaped component. Die casting has typically been used to produce components that do not require high thermal mechanical performance. For example, die casting is commonly used to produce components made from relatively low melting temperature materials that are not exposed to extreme temperatures. Die casting has not traditionally been a cost effective method for manufacturing parts made from high temperature alloys.
  • a shot tube plunger for a die casting system includes a first face, an opposing second face and an outer surface disposed between said first face and said opposing second face.
  • a channel circumferentially extends about the outer surface. The channel is operable to receive a portion of a charge of material introduced into the die casting system.
  • a die casting system in another exemplary embodiment, includes a die, a shot tube, a shot tube plunger and a disposable piston head.
  • the die includes a plurality of die components that define a die cavity.
  • the shot tube is in fluid communication with the die cavity.
  • the shot tube plunger is moveable within the shot tube to communicate a charge of material into the die cavity.
  • the disposable piston head is removably attached to the shot tube plunger.
  • the disposable piston head includes a first face and an opposing second face.
  • the first face includes an engagement member that contacts a portion of the charge of material and the opposing second face includes an attachment member that removably attaches the disposable piston head to the shot tube plunger.
  • a method of die casting a component with a die casting system includes removably attaching a disposable head to a shot tube plunger of the die casting system, injecting a charge of material into a die cavity of the die casting system with the shot tube plunger and attached disposable piston head, and capturing a portion of the charge of material in a channel that circumferentially extends about an outer surface of the disposable piston head during the step of injecting the charge of material.
  • Figure 1 illustrates a die casting system 10 including a reusable die 12 having a plurality of die elements 14, 16 that function to cast a component 15.
  • the component could include aeronautical components, such as gas turbine engine blades or vanes, or non-aeronautical components.
  • two die elements 14, 16 are depicted in Figure 1 , it should be understood that the die 12 could include more or fewer die elements, as well as other parts and configurations.
  • the die 12 is assembled by positioning the die elements 14, 16 together and holding the die elements 14, 16 at a desired positioning via a mechanism 18.
  • the mechanism 18 could include a clamping mechanism of appropriate hydraulic, pneumatic, electromechanical and/or other configurations.
  • the mechanism 18 also separates the die elements 14, 16 subsequent to casting.
  • the die elements 14, 16 include internal surfaces that cooperate to define a die cavity 20.
  • a shot tube 24 is in fluid communication with the die cavity 20 via one or more ports 26 that extend into the die element 14, the die element 16, or both.
  • a shot tube plunger 28 is received within the shot tube 24 and is moveable between a retracted and injected position (in the direction of arrow A) within the shot tube 24 by a mechanism 30.
  • a shaft 31 extends between the mechanism 30 and the shot tube plunger 28.
  • the mechanism 30 could include a hydraulic assembly or other suitable mechanism, including, but not limited to, hydraulic, pneumatic, electromechanical or any combination of mechanisms.
  • the shot tube 24 is positioned to receive a charge of material, such as molten metal, from a melting unit 32, such as a crucible, for example.
  • the melting unit 32 may utilize any known technique for melting an ingot of metallic material to prepare molten metal for delivery to the shot tube 24, including but not limited to, vacuum induction melting, electronic beam melting and induction skull melting.
  • the molten metal is melted by the melting unit 32 at a location that is separate from the shot tube 24 and the die 12.
  • the melting unit 32 of this example is positioned in relative close proximity to the shot tube 24 to reduce the transfer distance of the molten metal between the melting unit 32 and the shot tube 24.
  • Materials capable of being used to die cast a component 15 include, but are not limited to, nickel-based super alloys, cobalt-based super alloys, titanium alloys, aluminum alloys, zinc alloys, copper-based alloys, iron alloys, molybdenum, tungsten, niobium or other refractory metals. This disclosure is not limited to the disclosed alloys, and other high melting temperature materials may be utilized to die cast the component 15. As used herein, the term "high melting temperature material” is intended to include materials having a melting temperature of approximately 1500°F (815°C) and higher.
  • the molten metal is transferred from the melting unit 32 to the shot tube 24 in a known manner.
  • the molten metal may be poured into a pour hole 33 of the shot tube 24.
  • a sufficient amount of molten metal is poured into the shot tube 24 to fill the die cavity 20.
  • the shot tube plunger 28 is actuated to inject the molten metal under pressure from the shot tube 24 into the die cavity 20 to cast the component 15.
  • the die casting system 10 could be configured to cast multiple components in a single shot.
  • the die casting system 10 can be positioned within a vacuum chamber 34 that includes a vacuum source 35.
  • a vacuum is applied in the vacuum chamber 34 via the vacuum source 35 to render a vacuum die casting process.
  • the vacuum chamber 34 provides a non-reactive environment for the die casting system 10 that reduces reaction, contamination or other conditions that could detrimentally affect the quality of the die cast component, such as excess porosity of the die cast component that can occur as a result of exposure to oxygen.
  • the vacuum chamber 34 is maintained at a pressure between 1x10 -3 Torr and 1x10 -4 Torr, although other pressures are contemplated.
  • the actual pressure of the vacuum chamber 34 will vary based upon the type of component 15 being cast, among other conditions and factors.
  • each of the melting unit 32, the shot tube 24 and the die 12 are positioned within the vacuum chamber 34 during the die casting process such that the melting, injecting and solidifying of the high melting temperature material are all performed under vacuum.
  • the chamber 34 is backfilled with an inert gas, such as Argon, for example.
  • the example die casting system 10 depicted in Figure 1 is illustrative only and could include more or fewer sections, parts and/or components. This disclosure extends to all forms of die casting, including but not limited to, horizontal, inclined or vertical die casting systems and other die casting configurations.
  • Figures 2A-2C illustrate an example shot tube plunger 128 for use with a die casting system, such as the die casting system 10.
  • a die casting system such as the die casting system 10.
  • like reference numerals signify like features, and reference numerals signified by adding 100 to the original reference number are slightly modified features.
  • selected features of one example embodiment may be combined with selected features of other example embodiments within the scope of this disclosure.
  • the shot tube plunger 128 is disposable. That is, the shot tube plunger 128 is removable from the shaft 31 and may be disposed of after injection of a charge of material, such as a charge of a high melting temperature material, to cast a component 15.
  • the sacrificial shot tube plunger 128 can be removed either after a single injection or after multiple injections and replaced with another disposable shot tube plunger 128 for a subsequent injection.
  • the shot tube plunger 128 is a single-piece device having no mechanical attachments.
  • the shot tube plunger 128 is made from a material capable of withstanding contact with high melting temperature materials, such as the contact that occurs during the injection of a charge of material M during the die casting process, including but not limited to, steel, ceramic, or other refractory materials.
  • the shot tube plunger 128 includes a first face 41, a second face 43, and an outer cylindrical surface 45 disposed between the first face 41 and the second face 43.
  • the first face 41 faces the charge of material M within the shot tube 24, while the second face 43 faces the shaft 31.
  • the shot tube plunger 128 may include an engagement member 47, an attachment member 49 and/or a channel 51.
  • Figure 2A illustrates the shot tube plunger 128 having each of the engagement member 47, the attachment member 49 and the channel 51, it should be understood that the shot tube plunger 128 could include only one of these features or any combination of such features.
  • the outer surface 45 of the shot tube plunger 128 could be configured to include non-cylindrical shapes.
  • the first face 41 can include the engagement member 47.
  • the engagement member 47 provides an additional contact area for the charge of material M to bond to during injection.
  • the disposable shot tube plunger 128 remains attached to the cast component 15 (See Figure 2B ) via cast portion 17 that bonds to the engagement member 47, but is detached from the shaft 31.
  • the shot tube plunger 128 is then removed from the component 15 by removing the cast portion 17 and can then be disposed of.
  • the engagement member 47 includes a recess 55 (see Figure 2A ).
  • the recess 55 extends from the first face 41, which faces the charge of material M, toward the second face 43.
  • the recess 55 can include a variety of shapes and configurations, including but not limited to, a T-shaped configuration, a triangular configuration, a truncated configuration, etc. Other shapes are also contemplated as within the scope of this disclosure.
  • the first face 41 can include a single recess 55 or multiple recesses 55.
  • the engagement member 47 includes a protrusion 57 that protrudes from the first face 41 in a direction away from the second face 43 (See Figure 2C ).
  • the shot tube plunger 128 could include a single protrusion 57 ( Figure 2C ) or multiple protrusions 52 ( Figure 4E ).
  • the shot tube plunger 128 can also include an attachment member 49 for aligning and affixing the shot tube plunger 128 relative to the shaft 31.
  • the attachment member 49 is disposed on the second face 43 of the shot tube plunger 128.
  • the attachment member 49 includes a recess 59 (see Figure 2A ).
  • the recess 59 can include multiple shapes and sizes.
  • the recess 59 receives a corresponding protrusion 61 of the shaft 31.
  • the attachment member 49 includes a protrusion 63 that extends from the second face 43 and is received within a corresponding recess 65 of the shaft 31 (See Figure 2C ).
  • the shot tube plunger may also include the channel 51.
  • the channel 51 circumferentially extends about the outer cylindrical surface 45.
  • the channel 51 includes a circumferential groove 53 that extends radially inwardly from the outer cylindrical surface 45.
  • the channel 51 could also include other configurations.
  • the shot tube plunger 128 could include a single channel 51 or multiple channels 51.
  • FIG 3 illustrates another example shot tube plunger 228.
  • the shot tube plunger 228 includes a disposable piston head 40.
  • the disposable piston head 40 is removably attached to the shot tube plunger 228 and can be disposed of subsequent to an injection of a charge of material during a die casting process.
  • the disposable piston head 40 can be removed from the shaft 31 and disposed of either after a single injection or after multiple injections.
  • the disposable piston head 40 is made from a material capable of withstanding contact with high melting temperature materials.
  • the disposable piston head 40 could be made from steel, ceramic, or other refractory materials.
  • the disposable piston head 40 defines a first height H1
  • the shot tube plunger 228 defines a second height H2.
  • the first height H1 of the disposable piston head 40 and the second height H2 of the shot tube plunger 228 are generally equal. Therefore, the shot tube plunger 228 may be reciprocated between a retracted and injected position without creating interference with the inner wall 25 of the shot tube 24.
  • Figures 4A-4F illustrate example features of the disposable piston head 40.
  • the disposable piston head 40 includes a first face 42, a second face 44 and an outer cylindrical surface 46 disposed between the first face 42 and the second face 44.
  • the first face 42 faces a charge of material M (e.g., molten metal) within the shot tube 24, while the second face 44 faces the shot tube plunger 228 (shown in phantom).
  • material M e.g., molten metal
  • the first face 42 can include an engagement member 48.
  • the engagement member 48 provides a contact area for the charge of material M to bond to during injection. Once the injection is complete and the metal is solidified within the die cavity 20, the disposable piston head 40 remains attached to the cast component 15 (See Figure 4F ) via a cast portion 17. The disposable piston head 40 can then be removed from the component 15 and disposed of.
  • the engagement member 48 includes a recess 50 (see Figures 4A-4C ).
  • the recess 50 extends from the first face 42, which faces the charge of material M, in a direction toward the second face 44.
  • the recess 50 can include a variety of shapes and configurations, including truncated triangular configurations ( Figures 4A and 4B ) and T-shaped configurations ( Figure 4C ). Other shapes are contemplated as within the scope of this disclosure.
  • the first face 42 can include a single recess 50 (See Figure 4A ) or multiple recesses 50 (See Figure 4B ).
  • Figures 4D-4F illustrate another example engagement member 48 of the disposable piston head 40.
  • the engagement member 48 includes a protrusion 52 that protrudes from the first face 42 in a direction away from the second face 44.
  • the disposable piston head 40 can include a single protrusion 52 (See Figure 4D ), or multiple protrusions 52 (See Figure 4E ).
  • the protrusions 52 may have an enlarged head to further secure bonding.
  • FIGS 5A-5C illustrate another feature of the disposable piston head 40.
  • the disposable piston head 40 includes an attachment member 54 for aligning and affixing the disposable piston head 40 to the shot tube plunger 228.
  • the attachment member 54 is disposed on the second face 44 of the disposable piston head 40, which faces in a direction toward the shot tube plunger 228. That is, the attachment member 54 is positioned on an opposite side of the disposable piston head 40 from the charge of material M.
  • the attachment member 54 includes a recess 56 (see Figures 5A and 5C ).
  • the recess 55 can include multiple shapes and sizes, including but not limited to those depicted in Figure 5A and Figure 5C .
  • the recess 56 receives a corresponding protrusion 60 of the shot tube plunger 228 (shown in phantom) to removably attach the disposable piston head 40 to the shot tube plunger 228.
  • the attachment member 54 includes a protrusion 62 that extends from the second face 44 in a direction toward the shot tube plunger 228.
  • the protrusion 62 is received within a corresponding recess 64 of the shot tube plunger 228 to removably attach the disposable piston head 40 to the shot tube plunger 228.
  • FIGS 6A-6E illustrate yet another feature of the disposable piston head 40.
  • the disposable piston head 40 can include a channel 58 circumferentially disposed about the outer cylindrical surface 46 of the disposable piston head 40.
  • the channel 58 extends radially inward from the outer cylindrical surface 46 of the disposable piston head 40 to define a circumferential groove 66.
  • the channel 58 can define any of a multitude of varying shapes and configurations, such as depicted in Figures 6A-6E .
  • the outer cylindrical surface 46 of the disposable piston head 40 can include a plurality of channels 58 defined thereon.
  • Figures 3-6 illustrate multiple features of the disposable piston head 40.
  • the disposable piston head 40 could include one or all of the features described herein.
  • the disposable piston head 40 could include the engagement member 48, the attachment member 54 and the channel 58, or any combination of these features.
  • Figure 7 illustrates a disposable piston head 40 having each of the engagement member 48, the attachment member 54 and the channel 58.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP11187861.7A 2010-11-05 2011-11-04 Giesskolben für ein Druckgusssystem Withdrawn EP2450124A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/940,084 US20120111524A1 (en) 2010-11-05 2010-11-05 Shot tube plunger for a die casting system

Publications (2)

Publication Number Publication Date
EP2450124A2 true EP2450124A2 (de) 2012-05-09
EP2450124A3 EP2450124A3 (de) 2016-06-01

Family

ID=44905683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11187861.7A Withdrawn EP2450124A3 (de) 2010-11-05 2011-11-04 Giesskolben für ein Druckgusssystem

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US (1) US20120111524A1 (de)
EP (1) EP2450124A3 (de)
SG (1) SG180157A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103521704B (zh) * 2013-10-20 2015-06-03 吴小江 一种叶片的铸造方法
US10173261B2 (en) * 2015-11-17 2019-01-08 United Technologies Corporation Highly cooled die casting plunger
US10166601B2 (en) * 2015-11-17 2019-01-01 United Technologies Corporation Die cast tip cover and method of managing radial deflection of die cast tip
CN106513618A (zh) * 2016-09-29 2017-03-22 广西大学 一种适宜叶片的金属零件精密铸造方法
US20220048106A1 (en) * 2020-08-13 2022-02-17 Qingyou Han Ultrasound assisted shot chamber for die casting applications

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US3019495A (en) * 1958-05-28 1962-02-06 Litemetal Dicast Inc Die casting
US4154286A (en) * 1977-12-27 1979-05-15 Filippov Dmitry A Installation for die-casting of metal blanks
US4886107A (en) * 1986-02-28 1989-12-12 Zecman Kenneth P Piston for cold chamber
JP3330882B2 (ja) * 1998-10-23 2002-09-30 東芝機械株式会社 ダイカストマシンのプランジャチップ取付構造
US6745819B2 (en) * 2001-05-17 2004-06-08 Tht Presses Inc. Vertical die casting press and method of producing die cast metal parts
ITMI20022698A1 (it) * 2002-12-20 2004-06-21 Cannon Spa Procedimento ed apparecchiatura per lo stampaggio per
JP2004237295A (ja) * 2003-02-04 2004-08-26 Hitachi Metals Ltd 軽合金射出成形機用逆流防止装置
JP2004268067A (ja) * 2003-03-06 2004-09-30 Aisin Takaoka Ltd 圧力鋳造用プランジャーチップ
ES2242119T3 (es) * 2003-04-16 2005-11-01 Concast Ag Lingotera tubular para la colada continua.
US7291006B2 (en) * 2004-06-24 2007-11-06 Husky Injection Molding Systems Ltd. Check valve lip seal for an injection molding machine
US20080017345A1 (en) * 2006-07-20 2008-01-24 Husky Injection Molding Systems Ltd. Molding-system valve

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Title
None

Also Published As

Publication number Publication date
SG180157A1 (en) 2012-05-30
EP2450124A3 (de) 2016-06-01
US20120111524A1 (en) 2012-05-10

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