US3822737A - Apparatus for preparing foundry molds or cores from cold quick setting sand/binder/catalyst mixtures - Google Patents

Apparatus for preparing foundry molds or cores from cold quick setting sand/binder/catalyst mixtures Download PDF

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Publication number
US3822737A
US3822737A US00237699A US23769972A US3822737A US 3822737 A US3822737 A US 3822737A US 00237699 A US00237699 A US 00237699A US 23769972 A US23769972 A US 23769972A US 3822737 A US3822737 A US 3822737A
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United States
Prior art keywords
mixing chamber
chamber
mixing
outlet
blowing
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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
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US00237699A
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English (en)
Inventor
A Edwards
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Baker Perkins Ltd
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Baker Perkins Ltd
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/0472—Parts; Accessories; Controlling; Feeding; Discharging; Proportioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles

Definitions

  • This invention relates to a method and apparatus for preparing foundry moulds or cores from a quick cold setting sand/binder/catalyst mixture.
  • the invention provides a method of preparing a foundry mould or core comprising supplying separate charges of sand and binder on the one hand and sand and catalyst on the other hand to a mixing chamber in which the separate charges are mechanically intermixed to produce a final sand/binder/catalyst mixture, passing the final mixture by gravity into a blowing chamber and moving the mixing chamber and the blowing chamber apart to allow the final mixture to be blown from the blowing chamber into a mould or core box and to allow the mixing. chamber to be cleaned by cleaning means.
  • metered quantities of said charges are supplied to the mixing chamber whilst an outlet of the mixing chamber is closed, said charges being mixed in the mixing chamber for a predetermined time period and the outlet then being opened to discharge the final mixture.
  • the invention may be carried into effect either by movement of the mixing chamber to a position in which it is cleaned by said cleaning means, or alternatively by movement of the blowing chamber to a position in which the final mixture is blown from the blowing chamber into the mould or core box.
  • the invention further provides apparatus for preparing foundry moulds or cores comprising a mixing chamber, supply means for providing the mixing chamber with separate charges of sand and binder on the one hand and sand and catalyst on the other hand, a mechanical mixing element in the mixing chamber, an outlet from the mixing.
  • the mixing chamber may be movable between a first position in which it is adapted to deliver the mixed material to the blowing chamber, and a second position in which the mixing chamber is adapted to be cleaned by said cleaning means, or alternatively the blowing chamber may be movable between a first position in which it is adapted to receive the final mixture from the mixingchamber, and a second position in which the final mixture can be discharged into the mould or core box.
  • the purging means comprises compressed gas.
  • FIG. 1 is a diagrammatic view of apparatus according to one embodiment of the invention.
  • FIGS.- 2 and 3 are diagrammatic view of modified FIG. 6 is a vertical section of a cylindrical mixing chamber showing the mixer.
  • FIG. 7 is a top view of FIG. 6.
  • a pair of screwtype combined mixer conveyor units for example units of the type described in our US. Patent Specification No. 1,051,651 are supplied with metered quanti ties of sand and resin (or any other binder) and'sand and catalyst respectively and discharge their respective mixtures into twin reservoirs 2.
  • a first slide valve 3 controlling communication between the reservoirs and a mixing chamber 4 is opened admitting the separate mixtures to the mixing chamber.
  • the second pair of blades 18 are fixedly attached to a cross member 20 which also serves to sweep the roof of the mixing chamber.
  • a conventional blowing chamber or core shooter 6 has an inlet 6a controlled by a third slide valve 7, the inlet 6av being formed in a top plate 6b.
  • a rotary mixing element having said pair of tangentially mounted angle iron members with ri gid blades attached thereto, comprising the first pair of blades, is used, the mixing chamber being used as a batch mixer wherein metered amounts of the two separate mixers are introduced into the mixing chamber and intermixed for a predetermined period of time and then discharged.
  • valve 7 can be open and valve 5 is closed.
  • valve 3 is closed, and after mixing, the mixing chamber is slid across the top plate 6b, valve 5 is opened and when the mixing chamber outlet communicates with inlet 6a (as shown dotted) the final mixture is transferred by gravity into the core shooter.
  • the core mixing chamber is connected to a source of com pressed air which enters the chamber through tangentially disposed ports in the cylindrical wall to purge any materialremaining in the chamber into a suitable receptacle.
  • valve 7 is opened and the apparatus is ready for the preparation of a further mould or core.
  • the apparatus shown in FIG. 2 is similar to that shown in FIG. 1 and like references are used to refer to like parts.
  • the reservoirs 2 and valve 3 are eliminated and the separate mixtures are supplied to the mixing chamber by operation of the combined mixer conveyor units 1 for a period sufficient to provide the required amount of materials for a core or mould being prepared.
  • the final mixture is transferred directly by gravity into the core shooter by opening valves 5 and 7.
  • these valves are closed, the mixture is shot, and the mixing chamber is moved to one side (shown dotted) for purging by opening of valve 5. After purging the mixing chamber is returned to its initial position for the next cycle.
  • the apparatus shown in FIG. 3 is similar in construction and operation to the apparatus shown in FIG. 2 except that the outlet slide valve 5 of the mixing chamber is eliminated and the materials received from units 1 are intermixed by the rotary mixing element as they are passed substantially straight through the mixing chamber and into the core shooter.
  • FIG. 4 shows apparatus according to another embodiment of the invention in a mixing and charging position
  • FIG. 5 shows the apparatus in a position in which the core shooter or blowing chamber has been moved to a position for blowing the core or mould and for cleaning the mixing chamber.
  • the core or mould is shot by applying compressed air to the top and/or side of the core shooter and at the same time the mixing chamber 4 is purged with compressed gas into a suitable container.
  • the core or mould is removed and valve 5 is closed ready for the chamber 4 to receive further ingredients for a fresh mix.
  • the core shooter 6 is returned to its original position shown in FIG. 4 for the next cycle.
  • the core shooter or blowing head can be constructed to move on rollers running in tracks, slides or the like and driven by gears or pulleys from an electric motor.
  • the driving force can be a pneumatic or hydraulic piston and cylinder assembly and the core shooter or blowing head can be mounted for pivotal movement through a gear quadrant or the like.
  • FIGS. 1, 2, .3 and 4 can operate with mixing chamber constructions different to that described above and it is to be understood that the core shooters used with the equipment of the invention namely the supply means and movable mixing chamber, are in each case of a quite conventional known type.
  • Apparatus for preparing foundry moulds or cores from cold quick-setting sand/binder/catalyst mixtures comprising a mixing chamber, supply means for providing the mixing chamber with separate charges of sand and binder on the one hand and sand and catalyst on the other hand, a mechanical mixing element in the mixing chamber, an outlet from the mixing chamber for passing material by gravity from the mixing chamber into a blowing chamber, means for moving the mixing chamber and the blowing chamber apart to allow the final mixture to be discharged from the blowing chamber into a mould or core box and to allow the mixing chamber to be purged and purging means for the mixing chamber.
  • the mixing chamber is movable between a first position in which it is adapted to deliver the mixed material to the blowing chamber, and a second position in which the mixing chamber is adapted to be purged by said purging means.
  • blow ing chamber is movable between a first position in which it is adapted to receive the final mixture from the mixing chamber, and a second position in which the final mixture can be discharged into the mould or core box.
  • said purging means comprises means for supplying gas to the chamber.
  • the mixing chamber comprises a vertical cylindrical wall, a base wall with an outlet therein and a vertical axis rotary mixing element in the chamber, the element comprising a pair of angle iron members tangentially mounted to said'axis and having rigid blades attached thereto adapted to sweep the base wall and a pair of spring steel blades angularly offset from said pair of angle iron members adapted to sweep the vertical wall.
  • outlet of the mixing chamber is provided with a time controlled outlet valve adapted to close the outlet during a mixing operation and to open the outlet after a predetermined time interval for discharging the final mixture into the blowing chamber.
  • Apparatus according to claim 8 wherein metered amounts of said separate charges are intermixed in the mixing chamber in separate batches for a time interval of 10 seconds.
  • the mixing chamber comprises a vertical cylindrical wall, a base wall with an outlet therein and a vertical axis rotary mixing element in the chamber, the outlet comprising a pair of angle iron members tangentially mounted to said axis and having rigid blades attached thereto adapted to sweep the base wall and a pair of 11.
  • Apparatus according to claim 10 wherein the totary mixing element is rotated at a speed of RPM.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
US00237699A 1971-03-29 1972-03-24 Apparatus for preparing foundry molds or cores from cold quick setting sand/binder/catalyst mixtures Expired - Lifetime US3822737A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB809471 1971-03-29
GB809471A GB1369445A (en) 1971-03-29 1971-12-22 Method and apparatus for preparing foundry moulds and cores

Publications (1)

Publication Number Publication Date
US3822737A true US3822737A (en) 1974-07-09

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US00237699A Expired - Lifetime US3822737A (en) 1971-03-29 1972-03-24 Apparatus for preparing foundry molds or cores from cold quick setting sand/binder/catalyst mixtures

Country Status (6)

Country Link
US (1) US3822737A (enrdf_load_stackoverflow)
JP (1) JPS4944851B1 (enrdf_load_stackoverflow)
DE (1) DE2215887C3 (enrdf_load_stackoverflow)
FR (1) FR2132148B1 (enrdf_load_stackoverflow)
GB (1) GB1369445A (enrdf_load_stackoverflow)
IT (1) IT951825B (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946796A (en) * 1973-06-28 1976-03-30 British Cast Iron Research Association Apparatus for making sand-resin molds
US4056259A (en) * 1975-03-03 1977-11-01 Societe D'applications De Procedes Industriels Et Chimiques S.A.P.I.C. Process and apparatus for the continuous preparation of a mixture for foundry molds or the like, with formation of a premix
US4135569A (en) * 1977-07-13 1979-01-23 Acme-Cleveland Corporation Molding machine clean out
US4174906A (en) * 1975-03-03 1979-11-20 Societe D'applications De Procedes Industriels Et Chimiques S.A.P.I.C. Process and apparatus for the continuous preparation of a mixture for foundry molds or the like, with formation of a premix
US4175866A (en) * 1975-11-26 1979-11-27 Baker Perkins Holdings Limited Method of operating a foundry sand mixing machine
US4329063A (en) * 1975-11-26 1982-05-11 Baker Perkins Holdings Ltd. Foundry sand mixing machine
US4491418A (en) * 1981-11-17 1985-01-01 Maillefer S.A. Plastics extruder
US4616936A (en) * 1984-09-10 1986-10-14 Ber Fong Huang Construction of a foaming machine
US4798471A (en) * 1986-05-20 1989-01-17 Joachim Laempe Apparatus for making molding sand
WO2019127800A1 (zh) * 2017-12-27 2019-07-04 苏州明志科技有限公司 一种用于提高树脂砂综合性能的混砂工艺
US11666964B2 (en) * 2016-05-17 2023-06-06 Sintokogio, Ltd. Flaskless molding machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54110183A (en) * 1978-02-16 1979-08-29 Toyobo Co Ltd Membrane separator
JPH0341818Y2 (enrdf_load_stackoverflow) * 1984-11-30 1991-09-02
DE4020933A1 (de) * 1990-06-06 1991-12-12 Rheinische Maschinenfabrik & E Vorrichtung zum befuellen eines form- oder kernkastens bei giessereimaschinen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2223018A (en) * 1937-05-03 1940-11-26 Herbert S Simpson Apparatus for mixing molding sand
GB784525A (en) * 1954-12-08 1957-10-09 Powlings Patent Processes Ltd Apparatus for mixing cereals and the like
US3439733A (en) * 1965-12-27 1969-04-22 Sherwin Williams Co Foundry molding machine
US3494412A (en) * 1967-03-29 1970-02-10 Sherwin Williams Co Foundry mold blowing machine with multi-stage mixer
US3580326A (en) * 1968-03-27 1971-05-25 British Cast Iron Res Ass Apparatus for making foundry cores and moulds
US3662812A (en) * 1966-05-14 1972-05-16 British Cast Iron Res Ass Apparatus for mixing sand/resin/catalyst and blower-forming foundry cores

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1200507A (en) * 1968-02-16 1970-07-29 British Motor Corp Ltd Production of foundry cores
GB1237106A (en) * 1968-11-30 1971-06-30 British Motor Corp Ltd Production of foundry cores

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2223018A (en) * 1937-05-03 1940-11-26 Herbert S Simpson Apparatus for mixing molding sand
GB784525A (en) * 1954-12-08 1957-10-09 Powlings Patent Processes Ltd Apparatus for mixing cereals and the like
US3439733A (en) * 1965-12-27 1969-04-22 Sherwin Williams Co Foundry molding machine
US3662812A (en) * 1966-05-14 1972-05-16 British Cast Iron Res Ass Apparatus for mixing sand/resin/catalyst and blower-forming foundry cores
US3494412A (en) * 1967-03-29 1970-02-10 Sherwin Williams Co Foundry mold blowing machine with multi-stage mixer
US3580326A (en) * 1968-03-27 1971-05-25 British Cast Iron Res Ass Apparatus for making foundry cores and moulds

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946796A (en) * 1973-06-28 1976-03-30 British Cast Iron Research Association Apparatus for making sand-resin molds
US4056259A (en) * 1975-03-03 1977-11-01 Societe D'applications De Procedes Industriels Et Chimiques S.A.P.I.C. Process and apparatus for the continuous preparation of a mixture for foundry molds or the like, with formation of a premix
US4174906A (en) * 1975-03-03 1979-11-20 Societe D'applications De Procedes Industriels Et Chimiques S.A.P.I.C. Process and apparatus for the continuous preparation of a mixture for foundry molds or the like, with formation of a premix
US4175866A (en) * 1975-11-26 1979-11-27 Baker Perkins Holdings Limited Method of operating a foundry sand mixing machine
US4329063A (en) * 1975-11-26 1982-05-11 Baker Perkins Holdings Ltd. Foundry sand mixing machine
US4135569A (en) * 1977-07-13 1979-01-23 Acme-Cleveland Corporation Molding machine clean out
US4491418A (en) * 1981-11-17 1985-01-01 Maillefer S.A. Plastics extruder
US4616936A (en) * 1984-09-10 1986-10-14 Ber Fong Huang Construction of a foaming machine
US4798471A (en) * 1986-05-20 1989-01-17 Joachim Laempe Apparatus for making molding sand
US11666964B2 (en) * 2016-05-17 2023-06-06 Sintokogio, Ltd. Flaskless molding machine
WO2019127800A1 (zh) * 2017-12-27 2019-07-04 苏州明志科技有限公司 一种用于提高树脂砂综合性能的混砂工艺

Also Published As

Publication number Publication date
GB1369445A (en) 1974-10-09
FR2132148A1 (enrdf_load_stackoverflow) 1972-11-17
JPS4944851B1 (enrdf_load_stackoverflow) 1974-11-30
DE2215887A1 (de) 1972-11-23
DE2215887C3 (de) 1974-05-16
DE2215887B2 (de) 1973-10-18
IT951825B (it) 1973-07-10
FR2132148B1 (enrdf_load_stackoverflow) 1974-12-20

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