US2985928A - Method and apparatus for die casting and moulding - Google Patents

Method and apparatus for die casting and moulding Download PDF

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Publication number
US2985928A
US2985928A US774722A US77472258A US2985928A US 2985928 A US2985928 A US 2985928A US 774722 A US774722 A US 774722A US 77472258 A US77472258 A US 77472258A US 2985928 A US2985928 A US 2985928A
Authority
US
United States
Prior art keywords
vacuum
charging
plunger
conduit
chamber
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.)
Expired - Lifetime
Application number
US774722A
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English (en)
Inventor
Heskett Kenneth David
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.)
SPARKLETS Ltd
Original Assignee
SPARKLETS 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 SPARKLETS Ltd filed Critical SPARKLETS Ltd
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Publication of US2985928A publication Critical patent/US2985928A/en
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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
    • B22D17/14—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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/34—Moulds having venting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S164/00—Metal founding
    • Y10S164/09—Piston-vacuum
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/78—Processes of molding using vacuum

Definitions

  • This invention relates to apparatus for the die casting of metals and for the moulding of othermaterials such, for example,as synthetic; thermoplastic materials.
  • apparatus for feeding flowable material to the charging chamber of a die casting or moulding machine comprises a feed conduit which extends from a reservoir for the flowable material to a port in the charging chamber, a vacuum conduit which extends from a second port in the charging chamber and which is connected to a source of vacuum via a vacuum valve, and a charging plunger which is slidable in the charging chamber for delivering flowable material therefrom, said charging plunger acting to close the ports during its delivery stroke and to uncover them during its return stroke, and means being provided for preventing flowable material from being sucked along the vacuum conduit into the source of vacuum.
  • the means for preventing flowable material from reaching the source of vacuum consists of arranging the vacuum conduit to extend upwardly from the charging chamber for at least a sulficient portion of its length to render this sucking in of flowable material unlikely to occur.
  • the vacuum conduit could extend upwardly to a minimum vertical height of, say, one third of the height at which a column of the flowable material would be supported by a perfect vacuum, so that the source of vacuum would need to produce a degree of vacuum in excess of 33 /3 before flowable material could reach the top of the upwardly extending portion of the vacuum conduit, a condition which is unlikely to occur in practice.
  • a vacuum reservoir may be located between the source of vacuum and the vacuum valve, said vacuum reservoir being of volume greater than the volume of the charging chamber and acting to receive any flowable material which may be sucked along the vacuum conduit and thereby prevent it from reaching the source of vacuum.
  • the fixed die plate of a die casting machine carries the usual fixed die part 11.
  • the movable die part which mates with the fixed die part 11 is indicated at .12, and the said die parts 11 and 12 provide a die cavity 1'3 between them when in the closed condition illustrated, as well as the usual gate 14 and sprue l5.
  • a ice cylindrical charging chamber 16 having slidable therein a charging plunger 17 which is shown in the drawingin its fully retracted position.
  • a heated pot or crucible 18 for molten metal 19' such as aluminium or zine base alloy, is disposed below the charging chamber 16, and a. feed conduit 20 having its lower end immersed in the molten metal '19 extends upwardly from the crucible -18 to a port 21 in the bottom of the charging chamber 16.
  • the charging plunger 17 uncovers the port 21 when in its. fully retracted position, and that the plunger will obturate the port 21 during its delivery stroke.
  • a second port 22 is provided in the upper part of the charging chamber 16, substantially opposite the first port 21 so that the plunger 17' acts to uncover and obturate both these. ports, and this port 22 has a vacuum conduit 23 extending vertically upwardly therefrom to a height of, say, fifteen feet above the charging chamber 16.
  • the vacuum conduit 23 is joined to a. horizontal extension 24 thereof which contains a, vacuum valve 25, whereby the vacuum conduit can be connected to or isolated from a source of vacuum such as a vacuum pump indicated at 26.
  • a vacuum reservoir 27 is located between the vacuum pump and the vacuum valve, and it will be appreciated that in operating the machine the vacuum pump will operate continuously, so that when the valve 25 is closed the pump 26 continuously produces vacuum conditions in the reservoir 27 for rapidly producing a degree of vacuum in the vacuum conduit 23 when the valve 25 is opened.
  • Molten metal enters the charging chamber 16 from the crucible 18 via the feed conduit 20 under the influence of the vacuum until the chamber is charged, and the end of this charging period is determined by the cutting off of the vacuum, either by closing the valve 25 or by effecting the charging stroke of the charging plunger 17 so that the plunger obturates the ports 21 and 22 before the valve 25 is closed.
  • the valve 25 may be closed either before or immediately after the plunger 17 obturates the ports 21, 22.
  • An air seal is indicated at 28, between the piston 17 and the charging chamber 16, and gas heating flames acting on the feed tube 20 are indicated at 29.
  • the plunger 17 is provided with a projection 30 which lies between the opposed ports 21 and 22 when the plunger is in its retracted position, said projection acting to prevent the molten metal from passing directly from the feed conduit 20 to the vacuum conduit 23 in uninterrupted flow by deflecting the incoming molten metal horizontally along the chamber 16.
  • the duration of the charging period during which molten metal is being sucked into the chamber 16' will ideally be of such duration that the chamber 16 is charged.
  • the height of the vacuum conduit 23 provides a means whereby molten metal will normally be prevented from being sucked into the vacuum pump 26, as already referred to previously, and the vacuum reservoir 27 provides a further safeguard in that it will receive any molten metal which may pass the valve 25 and thereby prevent it from reaching the pump 26.
  • the improvements providing for better and higher speed operation of the machine, and comprising the combination with said charging chamber and charging plunger of vacuum-creating 4 mechanism including vacuum reservoir and conduit means connected with a vacuum port in the charging chamber which is substantially opposite the molten metal inlet port for rapid creation of vacuum conditions in said chamber, and a projection on the face of the charging plunger operative to deflect molten metal entering said charging chamber through said inlet port away from said vacuum port, wherein the conduit means leading from the vacuum port to the vacuum-creating mechanism has a vertical height relevant to said charging chamber in excess of the theoretical head of the molten metal obtained with a perfect vacuum, so that the degree of vacuum induced in the chamber cannot possibly suck molten'metal through said conduit means and into

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
US774722A 1957-11-22 1958-11-18 Method and apparatus for die casting and moulding Expired - Lifetime US2985928A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB36531/57A GB834723A (en) 1957-11-22 1957-11-22 Apparatus for die casting and moulding
GB1208726X 1957-11-22

Publications (1)

Publication Number Publication Date
US2985928A true US2985928A (en) 1961-05-30

Family

ID=66522946

Family Applications (1)

Application Number Title Priority Date Filing Date
US774722A Expired - Lifetime US2985928A (en) 1957-11-22 1958-11-18 Method and apparatus for die casting and moulding

Country Status (5)

Country Link
US (1) US2985928A (de)
CH (1) CH367288A (de)
DE (1) DE1175392B (de)
FR (1) FR1208726A (de)
GB (1) GB834723A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093871A (en) * 1960-07-15 1963-06-18 British Oxygen Co Ltd Die casting and moulding machine
US3201836A (en) * 1964-09-21 1965-08-24 Mount Vernon Die Casting Corp Method of, and apparatus for, die casting metals
US3268960A (en) * 1964-09-08 1966-08-30 Glenn R Morton Method of and means for producing dense articles from molten materials
US3283372A (en) * 1964-02-28 1966-11-08 Aluminum Co Of America Vacuum die casting apparatus
US4061176A (en) * 1975-08-08 1977-12-06 Groupement pour les Activites Atomiques et Avancees "GAAA" S.A. Fluid-tight cold-chamber pressure casting apparatus
US5059112A (en) * 1986-11-07 1991-10-22 Marianne Wieser Mold and die operation
US5281372A (en) * 1991-03-26 1994-01-25 Canon Kabushiki Kaisha Process for producing resin moldings having a concave-convex pattern on the surface
US5632936A (en) * 1994-05-04 1997-05-27 Ciba-Geigy Ag Method and apparatus for molding ophthalmic lenses using vacuum injection

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041340A1 (de) * 1980-11-03 1982-05-13 Maschinenfabrik Weingarten Ag, 7987 Weingarten Druckgiessverfahren zur herstellung von gasarmer, porenarmer und oxydarmer gussstuecke sowie druckgiessmaschine zur durchfuehrung des verfahrens
DE3042052C2 (de) * 1980-11-07 1984-08-09 MTU Motoren- und Turbinen-Union München GmbH, 8000 München Vorrichtung zum Spritzgießen von Präzisionsteilen
EP0226830B1 (de) * 1985-11-26 1990-01-10 Akio Nakano Einspritzvorrichtung bei einer Warmkammer-Spritzgussmaschine
FR2647379B1 (fr) * 1989-05-05 1991-07-26 Pont A Mousson Procede et dispositif d'alimentation en metal liquide d'un moule
DE4123463A1 (de) * 1991-07-16 1993-01-21 Audi Ag Verfahren zur herstellung von gussstuecken mittels einer druckgiessmaschine
FR2697773B1 (fr) * 1992-11-12 1995-02-10 Inoplast Sa Dispositif pour l'injection des matières composites à l'intérieur des moules de conformation.
CN119549679A (zh) 2023-09-01 2025-03-04 通用汽车环球科技运作有限责任公司 减少高压压铸零件中冰晶的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1954775A (en) * 1931-01-05 1934-04-10 Prec Castings Company Inc Die-casting machine
US2243835A (en) * 1939-06-10 1941-06-03 Western Electric Co Die casting machine
US2514390A (en) * 1945-11-21 1950-07-11 Plymouth Ind Products Inc Injection molding device
US2837794A (en) * 1956-01-23 1958-06-10 Ring Aluminum Dev Company Die casting machine
US2837792A (en) * 1953-09-24 1958-06-10 Ring Aluminum Dev Company Die casting machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT164875B (de) * 1942-04-13 1949-12-27 Philips Nv Verfahren und Vorrichtung zum Gießen von Gegenständen, derart, daß ein Stoff in flüssigem Zustand in eine entlüftete Form eingesaugt wird

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1954775A (en) * 1931-01-05 1934-04-10 Prec Castings Company Inc Die-casting machine
US2243835A (en) * 1939-06-10 1941-06-03 Western Electric Co Die casting machine
US2514390A (en) * 1945-11-21 1950-07-11 Plymouth Ind Products Inc Injection molding device
US2837792A (en) * 1953-09-24 1958-06-10 Ring Aluminum Dev Company Die casting machine
US2837794A (en) * 1956-01-23 1958-06-10 Ring Aluminum Dev Company Die casting machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093871A (en) * 1960-07-15 1963-06-18 British Oxygen Co Ltd Die casting and moulding machine
US3283372A (en) * 1964-02-28 1966-11-08 Aluminum Co Of America Vacuum die casting apparatus
US3268960A (en) * 1964-09-08 1966-08-30 Glenn R Morton Method of and means for producing dense articles from molten materials
US3201836A (en) * 1964-09-21 1965-08-24 Mount Vernon Die Casting Corp Method of, and apparatus for, die casting metals
US4061176A (en) * 1975-08-08 1977-12-06 Groupement pour les Activites Atomiques et Avancees "GAAA" S.A. Fluid-tight cold-chamber pressure casting apparatus
US5059112A (en) * 1986-11-07 1991-10-22 Marianne Wieser Mold and die operation
US5281372A (en) * 1991-03-26 1994-01-25 Canon Kabushiki Kaisha Process for producing resin moldings having a concave-convex pattern on the surface
US5632936A (en) * 1994-05-04 1997-05-27 Ciba-Geigy Ag Method and apparatus for molding ophthalmic lenses using vacuum injection

Also Published As

Publication number Publication date
CH367288A (de) 1963-02-15
FR1208726A (fr) 1960-02-25
DE1175392B (de) 1964-08-06
GB834723A (en) 1960-05-11

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