US3293703A - Vacuum molding apparatus - Google Patents

Vacuum molding apparatus Download PDF

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Publication number
US3293703A
US3293703A US236936A US23693662A US3293703A US 3293703 A US3293703 A US 3293703A US 236936 A US236936 A US 236936A US 23693662 A US23693662 A US 23693662A US 3293703 A US3293703 A US 3293703A
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Prior art keywords
pattern
sand
pattern plate
cavities
flask
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US236936A
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Arthur R Taccone
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Arthur R Taccone
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • B22C9/03Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C15/00Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23Compacting by gas pressure or vacuum
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C15/00Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing

Description

1386- 1966 A. R. TACCONE VACUUM MOLDING APPARATUS Filed Nov. 13, 1962 III] HHI ilHlH Hlii W [Win I NVENTOR. AR 77/0 R. 771cc om:

cw, J. AWL;

United States Patent This invention relates to molding machines and, more particularly, to machines for making green sand molds.

In making green sand molds wherein patterns are used with deep cavities to form elongated projections on the mold, it is a problem to get the sand down into the bottom of the cavity to form a faithful reproduction of the shape of the part. Further, it is difiicult by present practices to remove from the cavity in the pattern and draw the finished elongated extension of sand formed on the mold without damaging the extension.

The present invention provides a means for impressing a vacuum on the bottom of deep cavities in patterns so that the sand will be induced to flow to the bottoms of the cavities. Further, a pressure can be alternately introduced into the cavity to help draw long extensions on the mold from the pattern. The invention has utility in any green sand molding application where it is necessary to move the sand into diflicult cavities and contours.

It is, accordingly, an object of the present invention to provide an improved combination molding machine and pattern.

Another object of the invention is to provide an improved pattern plate for sand molding.

A further object of the invention is to provide an improved pattern plate which is simple in construction, economical to manufacture, and simple and eflicient to use.

With the above and other objects in view, the present invention consists of the combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawing and more particularly pointed out in the appended claims, it being understood that changes may be made in the form, size, proportions, and minor details of construction without departing from the spirit or sacrificing any of the advantages of the invention.

The figure of drawing shows a molding machine partly in cross section to illustrate the invention.

Now with more particular reference to the drawing, a molding machine is shown having a base 11. The base 11 has a cylinder with a piston rod 12 thereon for moving the pattern plate, pattern, and loaded flask up into engagement with a head 13 to compress sand around the pattern. The head 13 may be a rigid member or it could be of the well known diaphragm type of molding head.

A flask support 14 is fixed to the piston rod 12 and it is made up of a rigid plate like member having upwardly extending sides thereon which define an enclosed chamber under a pattern plate 15. A suitable seal such as an O- ring is provided in an upwardly facing groove and the O-ring can be made to seal against the bottom of the pattern plate 15, thereby forming a sealed compartment under the pattern plate 15.

A flask 16 is of a conventional type having guide pins 20 which engage suitable openings in the pattern plate 15. Orifices 18 are provided through the pattern plate which communicate with the chamber in the flask support 14 and, at their upper ends, communicate with the bottoms of cavities 19 in the pattern. The source of vacuum and/or air under pressure is connected to a hose 21 through a channel 22.

In operation, a quantity of sand will be put in the flask 16 and the piston rod 12 will be extended to bring the flask 16 up so that the head 13 compresses the sand in the flask. As the pressure of the head 13 is applied to the sand, a vacuum will be applied through the hose 21 and channel 22 and orifices 18 to the bottoms of the cavities 19 in the pattern. This will induce the sand to flow down into the bottoms of the cavities and provide a faithful reproduction of the pattern which would not be possible if the sand were to be merely pushed by the head 13.

At the end of the molding cycle when the head 13 is withdrawn by lowering the piston rod 12 to move the head 13 away from the flask 16, a slight pressure can be applied to air in the hose 21 which will be impressed upon the bottom of the sand formed in the cavities 19. This will aid in withdrawing the finished mold from the pattern in a conventional manner Without damaging it.

The foregoing specification sets forth the invention in its preferred practical forms but it is understood that the structure shown is capable of modification within a range of equivalents without departing from the invention which is to be understood is broadly novel as is commensurate with the appended claims.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

A molding machine comprising a base,

means to support a pattern plate on said base,

means to support a flask on said pattern plate,

a pattern on said pattern plate,

said pattern having relatively deep cavities therein,

orifices in the bottoms of said cavities,

means connecting av source of vacuum to said orifices whereby sand is induced to flow to the bottoms of said cavities,

means above said pattern plate to pack molding sand around said pattern,

said means to support said pattern plate comprising a member on said base having upwardly extending members thereon defining a chamber,

said pattern plate resting on said upwardly extending members, sealing means providing a seal between said members and said pattern plate, said means connecting said source of vacuum comprising a channel through said member connected to said source of vacuum,

and means selectively connecting said source of vacuum and a source of air under pressure to said chamber.

References Cited by the Examiner UNITED STATES PATENTS 1,475,935 12/ 1923 Coleman 2247 2,367,648 1/1945 Nichols 22192 2,951,260 9/ 1960 Harrison et al.

FOREIGN PATENTS 209,228 7/ 1957 Australia.

10,436 1884 Great Britain. 571,188 8/ 1945 Great Britain.

1. SPENCER OVERHOLSER, Primary Examiner.

MARCUS U. LYONS, MICHAEL B. BRINDISI,

Examiners. E. MAR, Assistant Examiner.

US236936A 1962-11-13 1962-11-13 Vacuum molding apparatus Expired - Lifetime US3293703A (en)

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Application Number Priority Date Filing Date Title
US236936A US3293703A (en) 1962-11-13 1962-11-13 Vacuum molding apparatus

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US3293703A true US3293703A (en) 1966-12-27

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556196A (en) * 1967-08-18 1971-01-19 Buehler Eugen Method for automatic production and transportation of flaskless sand moulds in metal casting
US3861447A (en) * 1971-12-14 1975-01-21 Akita Kk Molding method
US3872915A (en) * 1971-10-08 1975-03-25 Akita Kk Vacuum sealed molding apparatus
US3960198A (en) * 1975-04-25 1976-06-01 Mitsubishi Jukogyo Kabushiki Kaisha Reduced pressure mould production method
DE2554414A1 (en) * 1975-12-03 1977-06-08 Ahlfelder Maschinen Und Modell Method and apparatus for the manufacture of sand casting molds
DE2607553A1 (en) * 1976-02-25 1977-09-01 Badische Maschf Gmbh Foundry moulding machine for continuous moulding - using shooting equipment for filling and precompression to reduce noise and physical damage
US4069858A (en) * 1974-07-15 1978-01-24 Baker Perkins Holdings Limited Manufacture of foundry moulds and cores
DE2916211A1 (en) * 1979-04-21 1980-10-30 Kloeckner Humboldt Deutz Ag METHOD FOR PRODUCING A FIREPROOF FOUNDRY MOLD
FR2455937A1 (en) * 1979-05-08 1980-12-05 Sintokogio Ltd MODEL PLATE MOLDING METHOD AND APPARATUS
EP0054731A1 (en) * 1980-12-20 1982-06-30 Heinrich Wagner Maschinenfabrik GmbH & Co Method and apparatus for filling a flask with a moulding material
DE2844464C2 (en) * 1978-10-12 1983-03-24 Eugen Dipl.-Ing. 8871 Burtenbach De Buehler
US4620584A (en) * 1985-05-24 1986-11-04 Witt Raymond H Green sand mold filling system
US4915159A (en) * 1987-06-13 1990-04-10 Bmd Badische Maschinenfabrik Durlach Gmbh Method and apparatus for compacting foundry mold making material about a foundry mold pattern
FR2662959A1 (en) * 1989-01-07 1991-12-13 Fischer Ag Georg Method for manufacturing moulding bodies or cores made from moulding sand and press for implementing this method
DE4114362A1 (en) * 1991-05-02 1992-11-05 Wagner Heinrich Sinto Masch METHOD FOR PRODUCING A SAND FORM
US5161603A (en) * 1989-06-29 1992-11-10 Volkomich Anatoly A Method for production of single-use foundry molds and apparatus for realization thereof
US5261479A (en) * 1991-10-17 1993-11-16 Georg Fischer Ag Molding machine with pattern venting
ES2061374A2 (en) * 1991-09-27 1994-12-01 Fischer Georg Giessereianlagen Molding apparatus including vents comprising elongated slotted bars
FR2707537A1 (en) * 1993-07-12 1995-01-20 Peugeot Method and machine for moulding cores in moulding sand

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1475935A (en) * 1922-10-02 1923-12-04 Tabor Mfg Co Method and apparatus for forming sand molds
US2367648A (en) * 1943-04-02 1945-01-16 Illinois Clay Products Co Preparation of dry sand molds
GB571188A (en) * 1943-11-19 1945-08-10 Charles William Coleman Improvements in or relating to foundry moulding machines
US2951260A (en) * 1957-10-01 1960-09-06 Crown Machine And Tool Company Molding mechanism and heating arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1475935A (en) * 1922-10-02 1923-12-04 Tabor Mfg Co Method and apparatus for forming sand molds
US2367648A (en) * 1943-04-02 1945-01-16 Illinois Clay Products Co Preparation of dry sand molds
GB571188A (en) * 1943-11-19 1945-08-10 Charles William Coleman Improvements in or relating to foundry moulding machines
US2951260A (en) * 1957-10-01 1960-09-06 Crown Machine And Tool Company Molding mechanism and heating arrangement

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556196A (en) * 1967-08-18 1971-01-19 Buehler Eugen Method for automatic production and transportation of flaskless sand moulds in metal casting
US3872915A (en) * 1971-10-08 1975-03-25 Akita Kk Vacuum sealed molding apparatus
US3861447A (en) * 1971-12-14 1975-01-21 Akita Kk Molding method
US4069858A (en) * 1974-07-15 1978-01-24 Baker Perkins Holdings Limited Manufacture of foundry moulds and cores
US3960198A (en) * 1975-04-25 1976-06-01 Mitsubishi Jukogyo Kabushiki Kaisha Reduced pressure mould production method
FR2333594A1 (en) * 1975-12-03 1977-07-01 Kuenkel Wagner & Co Method and apparatus for the manufacture of sand molds
DE2554414A1 (en) * 1975-12-03 1977-06-08 Ahlfelder Maschinen Und Modell Method and apparatus for the manufacture of sand casting molds
DE2607553A1 (en) * 1976-02-25 1977-09-01 Badische Maschf Gmbh Foundry moulding machine for continuous moulding - using shooting equipment for filling and precompression to reduce noise and physical damage
DE2844464C2 (en) * 1978-10-12 1983-03-24 Eugen Dipl.-Ing. 8871 Burtenbach De Buehler
DE2916211A1 (en) * 1979-04-21 1980-10-30 Kloeckner Humboldt Deutz Ag METHOD FOR PRODUCING A FIREPROOF FOUNDRY MOLD
FR2455937A1 (en) * 1979-05-08 1980-12-05 Sintokogio Ltd MODEL PLATE MOLDING METHOD AND APPARATUS
EP0054731A1 (en) * 1980-12-20 1982-06-30 Heinrich Wagner Maschinenfabrik GmbH & Co Method and apparatus for filling a flask with a moulding material
US4620584A (en) * 1985-05-24 1986-11-04 Witt Raymond H Green sand mold filling system
US4915159A (en) * 1987-06-13 1990-04-10 Bmd Badische Maschinenfabrik Durlach Gmbh Method and apparatus for compacting foundry mold making material about a foundry mold pattern
FR2662959A1 (en) * 1989-01-07 1991-12-13 Fischer Ag Georg Method for manufacturing moulding bodies or cores made from moulding sand and press for implementing this method
US5137091A (en) * 1989-01-07 1992-08-11 Goerg Fischer Ag Process of producing molded body from green molding sand
US5161603A (en) * 1989-06-29 1992-11-10 Volkomich Anatoly A Method for production of single-use foundry molds and apparatus for realization thereof
DE4114362A1 (en) * 1991-05-02 1992-11-05 Wagner Heinrich Sinto Masch METHOD FOR PRODUCING A SAND FORM
ES2061374A2 (en) * 1991-09-27 1994-12-01 Fischer Georg Giessereianlagen Molding apparatus including vents comprising elongated slotted bars
US5261479A (en) * 1991-10-17 1993-11-16 Georg Fischer Ag Molding machine with pattern venting
FR2707537A1 (en) * 1993-07-12 1995-01-20 Peugeot Method and machine for moulding cores in moulding sand

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