US3265348A - Mold purging apparatus and method - Google Patents

Mold purging apparatus and method Download PDF

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Publication number
US3265348A
US3265348A US413132A US41313264A US3265348A US 3265348 A US3265348 A US 3265348A US 413132 A US413132 A US 413132A US 41313264 A US41313264 A US 41313264A US 3265348 A US3265348 A US 3265348A
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United States
Prior art keywords
passage
mold
pouring
inert gas
cavity
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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.)
Expired - Lifetime
Application number
US413132A
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English (en)
Inventor
Edmund Q Sylvester
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Individual
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Individual
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Publication date
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Priority to US413132A priority Critical patent/US3265348A/en
Priority to DEP1267A priority patent/DE1267801B/de
Priority to GB46078/65A priority patent/GB1094866A/en
Priority to NO160318A priority patent/NO115182B/no
Priority to LU49872A priority patent/LU49872A1/xx
Priority to JP40070900A priority patent/JPS523889B1/ja
Priority to FR39048A priority patent/FR1454354A/fr
Priority to ES0319873A priority patent/ES319873A1/es
Priority to CH1601565A priority patent/CH442633A/de
Priority to AT1047765A priority patent/AT268571B/de
Priority to BE672678A priority patent/BE672678A/xx
Priority to NL6515173A priority patent/NL6515173A/xx
Application granted granted Critical
Publication of US3265348A publication Critical patent/US3265348A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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

Definitions

  • the present invention relates to apparatus and method for purging molds of air and any other gases by the introduction of an inert gas into the mold and consequent displacement ofthe air and other gases.
  • a broad object of the invention is to provide novel apparatus and method for introducing the inert gas, which may be argon, into the mold.
  • the argon is heavier than air and when the mold is purged of air and other gases by argon, the argon remains in the mold against any tendency to displace it by other gases.
  • Another object of the present invention is to provide means and method for introducing a purging gas into a mold in such a way that it flows at the same rate in all portions of the mold and thereby substantially eliminates turbulence, resulting in a highly efficient purging operation.
  • a still further object is to provide novel apparatus and method for purging a mold by the introduction of a purging gas at the bottom thereof and which provides for effectively closing the bottom opening through which the purging gas is introduced but which enables effective introduction of molten metal to be cast through that bottom opening without losing any of the purging gas therethrough.
  • an object is to provide apparatus and method of the character just mentioned wherein a disintegrateable closure member is utilized for closing the bottom opening in the mold means, the mold means having a passage therethrough for introducing purging gas through the bottom opening, the closure member yielding for enabling this step, and the closure member disintegrating in the operation of bottom pouring into the mold.
  • FIGURE 1 is a vertical sectional view through apparatus made according to the present invention.
  • FIGURE 2 is a small scale view of the components of FIGURE 1, partially in elevation and partially in section, in partially separated position.
  • the apparatus shown includes an ingate construction indicated generally at 12, a mold 14, thereabove and a pressure pouring tube 16 in pouring relation to the ingate construction.
  • the mold 14 and the pouring tube 16 may be of conventional construction and the features of the present invention are incorporated in the ingate construction 12.
  • the mold 14 includes a body made up of a plurality of blocks 18 which may be of graphite and which define a casting cavity 20.
  • the pouring tube 16 includes a shank 22 and a head 24 having a tapered upper surface 26 adapted for engagement with a corresponding element of the ingate construction 12.
  • the pouring tube 16 includes a liner 28 preferably of ceramic material which defines an annular pouring passage 30.
  • the pouring tube 16 is utilized with a ladle in an arrangement in which superatmospheric pressure is applied to the ladle which forces molten metal therein upwardly through the pouring tube, through the ingate construction 12 and into the cavity of the mold.
  • This ingate construction is provided with a vertical passage 32 for the passage of molten metal therethrough, which in the assembly with the mold and pouring tube registers and communicates with the passage 30 in the pouring tube and the cavity 20 in the mold.
  • the ingate construction includes a number of members which may be conventional and found in other ingate constructions heretofore known; it includes a chill block 34 which may be of metal and which directly supports the mold 14 and functions to increase the cooling rate of the mold.
  • the chill block 34 is provided with a central aperture 35 in which a ceramic liner 36 is disposed defining a portion of the passage 32.
  • a slide 38 guided by guide bars on opposite sides thereof, the arrangement being that the slide may be operated from the exterior for movement between open position (shown in the drawings) and closed position.
  • This slide arrangement is conventional and it is believed unnecessary to show additional details thereof. It is moved between open and closed positions in directions perpendicular to the paper.
  • the slide 38 is provided with an aperture 41 also having a ceramic liner 42 which defines another portion of the passage 32. The movement of the slide is suificient to move the aperture therein entirely out of registration with the remainder of the passage.
  • a gate assembly piece 44 having an aperture 45, in'which is disposed a ceramic liner 46 defining a third portion of the passage 32.
  • the spout receptacle 4-8 includes a main plate like portion 50 depending from which is an annular extension 52 which defines a recess 54 having a tapered surrounding wall 55 and an annular top surface 57 which also constitutes a bottom surface of the spout receptacle. recess 54 receives the head 24 of the pouring tube and the surface 55 engages the surface 26 thereof.
  • the spout receptacle 48 is provided with an aperture 58 in which is disposed another ceramic liner 59 defining the fourth and lowermost portion of the passage 32.
  • the spout receptacle 48 is provided with a radial bore 59' at the outer end of which is suitably connected a line 60 leading from a source of the purging gas such as argon.
  • this line 60 is provided with a quick disconnect arrangement 62.
  • the bore 59 leads into a downwardly directed bore 64 which opens through the surface 57 of the recess 54.
  • the surface 57 is counterbored at 68 of such radial dimension :as to extend into the vertical bore 64.
  • annular ring 70 Positioned in this counterbore 68 is an annular ring 70 secured thereto by suitable means such as screws 72.
  • This ring terminates outwardly at 74 in line with the radially inner surface 76 of the vertical bore 64 so as to leave an annular passage 78 which communicates with the vertical bore 64 and provides an annular passage completely around the recess 54 and opening downwardly through the surface 57.
  • a member for closing the lower end of the passage 32 and thus closing the mold is in the form of a diaphragm 80 which may be paper or other quickly disintegrateable material.
  • the diaphragm is held in place by a snap ring 82 yieldingly held in a circumferential groove 84 formed in the upper extremity of the tapered surface 55.
  • the margin-al edge of the diaphragm is placed in the groove and the snap ring snapped in place thereover to hold the diaphragm in place.
  • An annular gasket 86 which may be of asbestos, is secured to the diaphragm as by cementmg.
  • the argon under suitable pressure is introduced through the line 60 and bore 59'. It flows downwardly through the bore 64 and into the annular passage 78, and then works against the diaphragm and flexes it downwardly (including thegasket 86) to the dotted line position of FIGURE 2, providing a complete circular space establishing communication with the passage 32.
  • the argon forces the air and all other gases ahead of it and forms a column of pure argon in the passage 32 pushing the gases upwardly.
  • the argon is introduced at a rate sufiiciently low to prevent turbulence with the air.
  • One of the features working to this end is the introduction of the argon from all directions to the passage 32, i.e., in the space directly above the diaphragm when the diaphragm is fixed downward.
  • the flow of argon is continued in such rate as to continuously maintain a column of pure argon which forces the air and all other gases out of the mold.
  • the ingate construction 12 is either removed from the pouring tube, or spaced upwardly therefrom (FIGURE 2) a sufficient distance to enable the diaphragm to be flexed downwardly and after the purging step has been completed the ingate construction with the mold is lowered, or if desired the pouring tube raised, to establish proper pouring engagement.
  • the gasket 86 provides additional sealing engagement between the surface of the recess and the pouring tube.
  • the diaphragm Upon the molten metal, such as steel, rising in the pouring tube it engages the diaphragm and disintegrates it. In the case of paper the paper is burned.
  • the diaphragm maybe made of any of various materials, for example, aluminum foil which is readily and quickly melted by the molten metal.
  • Mold means having a bottom pouring opening, a bottom surface through which said pouring opening opens, a purging gas passage for introducing inert gas into said mold, saidpassage opening through said bottomsurface adjacent .to but offset from said bottom pouring opening, and means for closing said bottom pouring opening, said closing means disintegrateable by material poured into the mold for cast-ing and being secured to said bot-tom surface in covering relation to both the pouring opening and said purging gas passage and is enabled to yield and spread from said bottom surface in response to gas introduced through said purging gas passage whereby to form an open space between the closing means and said bottom surf-ace establishing communication between said purging gas passage and pouring opening.
  • botto surface includes an annular groove therein communicating with said purging gas passage forming an extension thereof opening through said bottom surface whereby when the closing means is separated from said bottom surface, gas is enabled to flow from said purging gas passage into said space radially inwardly in all directions.
  • Mold means adapted for use in bottom pressure pouring casting comprising a mold having a downwardly opening cavity, ingate construction below and supporting the mold and having a pouring passage therethrough in register with and communicating with the cavity, the passage opening downwardly through the, ingate construction and the ingate construction including a spout receptacle as a lowermost element having a recess including a surface in its upper portion defining a bottom surface of the ingate construction and surrounding said passage, the spout receptacle also including a downwardly extending annular projection defining -a downwardly and outwardly tapering surrounding wall of the recess, the ingate construction having a radially inwardly extending purging gas passage opening downwardly through said annular bottom surface adjacent to but spaced from said pouring passage, and a disintegrateable diaphragm covering said bottom surface and covering said pouring passage and purging gas passage, means releaseably securing the marginal edge of the diaphrgam to said downwardly tapering wall adjacent said bottom surface, said
  • annular gasket is secured to said diaphragm in surrounding relationship'to said pouring passage and effective for establishing sealing relation between an upper surface of a vertical pouring tube and said bottom surface when said pouring tube is introduced into said recess.
  • a method of casting in conjunction with mold means having a cavity and a downwardly opening passage communicating with the cavity comprising closing the bottom open end of the passage with a disintegrateable closure, introducing inert gas into said passage from the bottom of the passage above said closure and continuing the introduction of the inert gas sufficiently to fill the passage and cavity and at a rate of flow sufliiciently low to eliminate turbulence and mixture between the inert gas and air, and pouring molten casting material into the mold by pouring it against the disintegrateable closure and thereby disintegrating it, and continuing the pouring step until the mold is filled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Nozzles For Electric Vacuum Cleaners (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Continuous Casting (AREA)
  • Powder Metallurgy (AREA)
US413132A 1964-11-23 1964-11-23 Mold purging apparatus and method Expired - Lifetime US3265348A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US413132A US3265348A (en) 1964-11-23 1964-11-23 Mold purging apparatus and method
DEP1267A DE1267801B (de) 1964-11-23 1965-10-28 Begasungsvorrichtung fuer die Kokille einer Niederdruckgiessanlage
GB46078/65A GB1094866A (en) 1964-11-23 1965-11-01 Mould purging apparatus and method
NO160318A NO115182B (no) 1964-11-23 1965-11-03
LU49872A LU49872A1 (no) 1964-11-23 1965-11-18
FR39048A FR1454354A (fr) 1964-11-23 1965-11-19 Procédé et dispositif de moulage, comportant une purge
JP40070900A JPS523889B1 (no) 1964-11-23 1965-11-19
ES0319873A ES319873A1 (es) 1964-11-23 1965-11-22 Un dispositivo de molde para la colada de metales.
CH1601565A CH442633A (de) 1964-11-23 1965-11-22 Giesseinrichtung
AT1047765A AT268571B (de) 1964-11-23 1965-11-22 Verfahren und Vorrichtung zum Gießen in einer Schutzgasatmosphäre
BE672678A BE672678A (no) 1964-11-23 1965-11-22
NL6515173A NL6515173A (no) 1964-11-23 1965-11-23

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US413132A US3265348A (en) 1964-11-23 1964-11-23 Mold purging apparatus and method

Publications (1)

Publication Number Publication Date
US3265348A true US3265348A (en) 1966-08-09

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ID=23635978

Family Applications (1)

Application Number Title Priority Date Filing Date
US413132A Expired - Lifetime US3265348A (en) 1964-11-23 1964-11-23 Mold purging apparatus and method

Country Status (12)

Country Link
US (1) US3265348A (no)
JP (1) JPS523889B1 (no)
AT (1) AT268571B (no)
BE (1) BE672678A (no)
CH (1) CH442633A (no)
DE (1) DE1267801B (no)
ES (1) ES319873A1 (no)
FR (1) FR1454354A (no)
GB (1) GB1094866A (no)
LU (1) LU49872A1 (no)
NL (1) NL6515173A (no)
NO (1) NO115182B (no)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443629A (en) * 1966-07-18 1969-05-13 Amsted Ind Inc Apparatus for casting metal articles
US3465810A (en) * 1967-12-04 1969-09-09 Sylvester Enterprises Inc Apparatus for casting metal
US3897817A (en) * 1973-08-27 1975-08-05 Caterpillar Tractor Co Sand casting mold
US5067552A (en) * 1989-07-26 1991-11-26 Ltv Steel Company, Inc. Shrouding for top pouring of ingots
US5297611A (en) * 1990-11-05 1994-03-29 Comalco Aluminium Limited Casting of metal objects
US5735334A (en) * 1991-12-07 1998-04-07 Alloy Technologies Limited Casting of light metal alloys
US6516869B2 (en) 2001-02-15 2003-02-11 Teksid Aluminum S.P.A. Mould structure for producing light metal alloy casts and a low pressure precision casting method in a semi permanent mould
US6552473B2 (en) 2000-06-30 2003-04-22 C. R. F. Societa Consortile Per Azioni Control valve with a self-compensating piezoelectric actuator

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2947602A1 (de) * 1979-10-30 1981-05-14 BBC AG Brown, Boveri & Cie., Baden, Aargau Niederdruck-giessverfahren und niederdruck-giessvorrichtung fuer sauerstoffempfindliche gusswerkstoffe
JP4512580B2 (ja) * 2006-11-29 2010-07-28 本田技研工業株式会社 フィルタ設置装置と、それを用いた湯路のガス置換方法
JP6458008B2 (ja) * 2013-05-08 2019-01-23 ボーグワーナー インコーポレーテッド チタンアルミナイド部品を鋳造するための方法及び装置
DE102014015557B3 (de) * 2014-10-21 2016-03-03 Heinrich G. Baumgartner Vertikal-Gasdruck-Gießmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US674341A (en) * 1900-07-16 1901-05-14 Isaac Lehman Apparatus for casting ingots.
US2082588A (en) * 1936-01-04 1937-06-01 Mantle Lamp Co America Apparatus for producing slush castings
US2521362A (en) * 1947-09-13 1950-09-05 American Metal Co Ltd Apparatus for casting metal
US2912728A (en) * 1956-02-14 1959-11-17 Griffin Wheel Co Casting method and apparatus
US3142099A (en) * 1961-06-27 1964-07-28 Union Carbide Corp Metal casting in a protective atmosphere
US3163897A (en) * 1962-05-21 1965-01-05 Amsted Ind Inc Method and apparatus for casting metal articles

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE681458C (de) * 1938-04-02 1939-09-23 Cie Generale D Electro Metallu Vorrichtung zum Giessen von Metallbloecken, insbesondere aus Kupfer oder einer Kupferlegierung
US2874424A (en) * 1955-05-09 1959-02-24 Griffin Wheel Co Pouring spout assembly and mounting arrangement
AT224824B (de) * 1957-03-08 1962-12-10 Edmund Quincy Sylvester Verfahren und Vorrichtung zum Gießen von Metallen
NL255929A (no) * 1959-09-16
DE1156944B (de) * 1960-01-23 1963-11-07 Balzers Vakuum G M B H Vorrichtung zum Entgasen einer Metallschmelze

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US674341A (en) * 1900-07-16 1901-05-14 Isaac Lehman Apparatus for casting ingots.
US2082588A (en) * 1936-01-04 1937-06-01 Mantle Lamp Co America Apparatus for producing slush castings
US2521362A (en) * 1947-09-13 1950-09-05 American Metal Co Ltd Apparatus for casting metal
US2912728A (en) * 1956-02-14 1959-11-17 Griffin Wheel Co Casting method and apparatus
US3142099A (en) * 1961-06-27 1964-07-28 Union Carbide Corp Metal casting in a protective atmosphere
US3163897A (en) * 1962-05-21 1965-01-05 Amsted Ind Inc Method and apparatus for casting metal articles

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443629A (en) * 1966-07-18 1969-05-13 Amsted Ind Inc Apparatus for casting metal articles
US3465810A (en) * 1967-12-04 1969-09-09 Sylvester Enterprises Inc Apparatus for casting metal
US3897817A (en) * 1973-08-27 1975-08-05 Caterpillar Tractor Co Sand casting mold
US5067552A (en) * 1989-07-26 1991-11-26 Ltv Steel Company, Inc. Shrouding for top pouring of ingots
US5297611A (en) * 1990-11-05 1994-03-29 Comalco Aluminium Limited Casting of metal objects
US5477906A (en) * 1990-11-05 1995-12-26 Comalco Aluminum Limited Casting of metal objects
US5735334A (en) * 1991-12-07 1998-04-07 Alloy Technologies Limited Casting of light metal alloys
US6552473B2 (en) 2000-06-30 2003-04-22 C. R. F. Societa Consortile Per Azioni Control valve with a self-compensating piezoelectric actuator
US6516869B2 (en) 2001-02-15 2003-02-11 Teksid Aluminum S.P.A. Mould structure for producing light metal alloy casts and a low pressure precision casting method in a semi permanent mould

Also Published As

Publication number Publication date
DE1267801B (de) 1968-05-09
ES319873A1 (es) 1966-08-01
GB1094866A (en) 1967-12-13
LU49872A1 (no) 1966-03-17
JPS523889B1 (no) 1977-01-31
FR1454354A (fr) 1966-09-30
BE672678A (no) 1966-03-16
CH442633A (de) 1967-08-31
AT268571B (de) 1969-02-10
NL6515173A (no) 1966-05-24
NO115182B (no) 1968-08-19

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